License cleanup: add SPDX GPL-2.0 license identifier to files with no license
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.
By default all files without license information are under the default
license of the kernel, which is GPL version 2.
Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.
How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,
Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.
The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.
The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.
Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if <5
lines).
All documentation files were explicitly excluded.
The following heuristics were used to determine which SPDX license
identifiers to apply.
- when both scanners couldn't find any license traces, file was
considered to have no license information in it, and the top level
COPYING file license applied.
For non */uapi/* files that summary was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 11139
and resulted in the first patch in this series.
If that file was a */uapi/* path one, it was "GPL-2.0 WITH
Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 WITH Linux-syscall-note 930
and resulted in the second patch in this series.
- if a file had some form of licensing information in it, and was one
of the */uapi/* ones, it was denoted with the Linux-syscall-note if
any GPL family license was found in the file or had no licensing in
it (per prior point). Results summary:
SPDX license identifier # files
---------------------------------------------------|------
GPL-2.0 WITH Linux-syscall-note 270
GPL-2.0+ WITH Linux-syscall-note 169
((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21
((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17
LGPL-2.1+ WITH Linux-syscall-note 15
GPL-1.0+ WITH Linux-syscall-note 14
((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5
LGPL-2.0+ WITH Linux-syscall-note 4
LGPL-2.1 WITH Linux-syscall-note 3
((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3
((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1
and that resulted in the third patch in this series.
- when the two scanners agreed on the detected license(s), that became
the concluded license(s).
- when there was disagreement between the two scanners (one detected a
license but the other didn't, or they both detected different
licenses) a manual inspection of the file occurred.
- In most cases a manual inspection of the information in the file
resulted in a clear resolution of the license that should apply (and
which scanner probably needed to revisit its heuristics).
- When it was not immediately clear, the license identifier was
confirmed with lawyers working with the Linux Foundation.
- If there was any question as to the appropriate license identifier,
the file was flagged for further research and to be revisited later
in time.
In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.
Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights. The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.
Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.
In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.
Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
- a full scancode scan run, collecting the matched texts, detected
license ids and scores
- reviewing anything where there was a license detected (about 500+
files) to ensure that the applied SPDX license was correct
- reviewing anything where there was no detection but the patch license
was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
SPDX license was correct
This produced a worksheet with 20 files needing minor correction. This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.
These .csv files were then reviewed by Greg. Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected. This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.) Finally Greg ran the script using the .csv files to
generate the patches.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-11-01 14:07:57 +00:00
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// SPDX-License-Identifier: GPL-2.0
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2005-04-16 22:20:36 +00:00
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/* arch/sparc64/kernel/kprobes.c
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*
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* Copyright (C) 2004 David S. Miller <davem@davemloft.net>
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*/
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#include <linux/kernel.h>
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#include <linux/kprobes.h>
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2016-09-19 21:36:29 +00:00
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#include <linux/extable.h>
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2007-05-08 07:27:03 +00:00
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#include <linux/kdebug.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
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#include <linux/slab.h>
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2013-09-14 12:02:11 +00:00
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#include <linux/context_tracking.h>
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2005-04-16 22:20:36 +00:00
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#include <asm/signal.h>
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2005-09-06 22:19:30 +00:00
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#include <asm/cacheflush.h>
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2016-12-24 19:46:01 +00:00
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#include <linux/uaccess.h>
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2005-04-16 22:20:36 +00:00
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/* We do not have hardware single-stepping on sparc64.
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* So we implement software single-stepping with breakpoint
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* traps. The top-level scheme is similar to that used
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* in the x86 kprobes implementation.
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*
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* In the kprobe->ainsn.insn[] array we store the original
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* instruction at index zero and a break instruction at
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* index one.
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*
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* When we hit a kprobe we:
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* - Run the pre-handler
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* - Remember "regs->tnpc" and interrupt level stored in
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* "regs->tstate" so we can restore them later
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* - Disable PIL interrupts
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* - Set regs->tpc to point to kprobe->ainsn.insn[0]
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* - Set regs->tnpc to point to kprobe->ainsn.insn[1]
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* - Mark that we are actively in a kprobe
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*
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* At this point we wait for the second breakpoint at
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* kprobe->ainsn.insn[1] to hit. When it does we:
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* - Run the post-handler
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* - Set regs->tpc to "remembered" regs->tnpc stored above,
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* restore the PIL interrupt level in "regs->tstate" as well
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* - Make any adjustments necessary to regs->tnpc in order
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* to handle relative branches correctly. See below.
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* - Mark that we are no longer actively in a kprobe.
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*/
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2005-11-07 09:00:11 +00:00
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DEFINE_PER_CPU(struct kprobe *, current_kprobe) = NULL;
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DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
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2007-10-16 08:27:49 +00:00
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struct kretprobe_blackpoint kretprobe_blacklist[] = {{NULL, NULL}};
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2005-09-06 22:19:30 +00:00
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int __kprobes arch_prepare_kprobe(struct kprobe *p)
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2005-04-16 22:20:36 +00:00
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{
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2009-12-10 07:57:24 +00:00
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if ((unsigned long) p->addr & 0x3UL)
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return -EILSEQ;
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2005-04-16 22:20:36 +00:00
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p->ainsn.insn[0] = *p->addr;
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[SPARC64]: Fix several kprobes bugs.
- relbranch_fixup(), for non-branches, would end up setting
regs->tnpc incorrectly, in fact it would set it equal to
regs->tpc which would cause that instruction to execute twice
Also, if this is not a PC-relative branch, we should just
leave regs->tnpc as-is. This covers cases like 'jmpl' which
branch to absolute values.
- To be absolutely %100 safe, we need to flush the instruction
cache for all assignments to kprobe->ainsn.insn[], including
cases like add_aggr_kprobe()
- prev_kprobe's status field needs to be 'unsigned long' to match
the type of the value it is saving
- jprobes were totally broken:
= jprobe_return() can run in the stack frame of the jprobe handler,
or in an even deeper stack frame, thus we'll be in the wrong
register window than the one from the original probe state.
So unwind using 'restore' instructions, if necessary, right
before we do the jprobe_return() breakpoint trap.
= There is no reason to save/restore the register window saved
at %sp at jprobe trigger time. Those registers cannot be
modified by the jprobe handler. Also, this code was saving
and restoring "sizeof (struct sparc_stackf)" bytes. Depending
upon the caller, this could clobber unrelated stack frame
pieces if there is only a basic 128-byte register window
stored on the stack, without the argument save area.
So just saving and restoring struct pt_regs is sufficient.
= Kill the "jprobe_saved_esp", totally unused.
Also, delete "jprobe_saved_regs_location", with the stack frame
unwind now done explicitly by jprobe_return(), this check is
superfluous.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-10 10:42:03 +00:00
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flushi(&p->ainsn.insn[0]);
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2005-04-16 22:20:36 +00:00
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p->ainsn.insn[1] = BREAKPOINT_INSTRUCTION_2;
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[SPARC64]: Fix several kprobes bugs.
- relbranch_fixup(), for non-branches, would end up setting
regs->tnpc incorrectly, in fact it would set it equal to
regs->tpc which would cause that instruction to execute twice
Also, if this is not a PC-relative branch, we should just
leave regs->tnpc as-is. This covers cases like 'jmpl' which
branch to absolute values.
- To be absolutely %100 safe, we need to flush the instruction
cache for all assignments to kprobe->ainsn.insn[], including
cases like add_aggr_kprobe()
- prev_kprobe's status field needs to be 'unsigned long' to match
the type of the value it is saving
- jprobes were totally broken:
= jprobe_return() can run in the stack frame of the jprobe handler,
or in an even deeper stack frame, thus we'll be in the wrong
register window than the one from the original probe state.
So unwind using 'restore' instructions, if necessary, right
before we do the jprobe_return() breakpoint trap.
= There is no reason to save/restore the register window saved
at %sp at jprobe trigger time. Those registers cannot be
modified by the jprobe handler. Also, this code was saving
and restoring "sizeof (struct sparc_stackf)" bytes. Depending
upon the caller, this could clobber unrelated stack frame
pieces if there is only a basic 128-byte register window
stored on the stack, without the argument save area.
So just saving and restoring struct pt_regs is sufficient.
= Kill the "jprobe_saved_esp", totally unused.
Also, delete "jprobe_saved_regs_location", with the stack frame
unwind now done explicitly by jprobe_return(), this check is
superfluous.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-10 10:42:03 +00:00
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flushi(&p->ainsn.insn[1]);
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2005-06-23 07:09:25 +00:00
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p->opcode = *p->addr;
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2006-01-10 04:52:43 +00:00
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return 0;
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2005-06-23 07:09:25 +00:00
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}
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2005-09-06 22:19:30 +00:00
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void __kprobes arch_arm_kprobe(struct kprobe *p)
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2005-06-23 07:09:25 +00:00
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{
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*p->addr = BREAKPOINT_INSTRUCTION;
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flushi(p->addr);
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}
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2005-09-06 22:19:30 +00:00
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void __kprobes arch_disarm_kprobe(struct kprobe *p)
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2005-06-23 07:09:25 +00:00
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{
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*p->addr = p->opcode;
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flushi(p->addr);
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2005-04-16 22:20:36 +00:00
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}
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2006-04-19 05:22:03 +00:00
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static void __kprobes save_previous_kprobe(struct kprobe_ctlblk *kcb)
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2005-06-23 07:09:39 +00:00
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{
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2005-11-07 09:00:11 +00:00
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kcb->prev_kprobe.kp = kprobe_running();
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kcb->prev_kprobe.status = kcb->kprobe_status;
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kcb->prev_kprobe.orig_tnpc = kcb->kprobe_orig_tnpc;
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kcb->prev_kprobe.orig_tstate_pil = kcb->kprobe_orig_tstate_pil;
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2005-06-23 07:09:39 +00:00
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}
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2006-04-19 05:22:03 +00:00
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static void __kprobes restore_previous_kprobe(struct kprobe_ctlblk *kcb)
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2005-06-23 07:09:39 +00:00
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{
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sparc: Replace __get_cpu_var uses
__get_cpu_var() is used for multiple purposes in the kernel source. One of
them is address calculation via the form &__get_cpu_var(x). This calculates
the address for the instance of the percpu variable of the current processor
based on an offset.
Other use cases are for storing and retrieving data from the current
processors percpu area. __get_cpu_var() can be used as an lvalue when
writing data or on the right side of an assignment.
__get_cpu_var() is defined as :
#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
__get_cpu_var() always only does an address determination. However, store
and retrieve operations could use a segment prefix (or global register on
other platforms) to avoid the address calculation.
this_cpu_write() and this_cpu_read() can directly take an offset into a
percpu area and use optimized assembly code to read and write per cpu
variables.
This patch converts __get_cpu_var into either an explicit address
calculation using this_cpu_ptr() or into a use of this_cpu operations that
use the offset. Thereby address calculations are avoided and less registers
are used when code is generated.
At the end of the patch set all uses of __get_cpu_var have been removed so
the macro is removed too.
The patch set includes passes over all arches as well. Once these operations
are used throughout then specialized macros can be defined in non -x86
arches as well in order to optimize per cpu access by f.e. using a global
register that may be set to the per cpu base.
Transformations done to __get_cpu_var()
1. Determine the address of the percpu instance of the current processor.
DEFINE_PER_CPU(int, y);
int *x = &__get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(&y);
2. Same as #1 but this time an array structure is involved.
DEFINE_PER_CPU(int, y[20]);
int *x = __get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(y);
3. Retrieve the content of the current processors instance of a per cpu
variable.
DEFINE_PER_CPU(int, y);
int x = __get_cpu_var(y)
Converts to
int x = __this_cpu_read(y);
4. Retrieve the content of a percpu struct
DEFINE_PER_CPU(struct mystruct, y);
struct mystruct x = __get_cpu_var(y);
Converts to
memcpy(&x, this_cpu_ptr(&y), sizeof(x));
5. Assignment to a per cpu variable
DEFINE_PER_CPU(int, y)
__get_cpu_var(y) = x;
Converts to
__this_cpu_write(y, x);
6. Increment/Decrement etc of a per cpu variable
DEFINE_PER_CPU(int, y);
__get_cpu_var(y)++
Converts to
__this_cpu_inc(y)
Cc: sparclinux@vger.kernel.org
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
2014-08-17 17:30:54 +00:00
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__this_cpu_write(current_kprobe, kcb->prev_kprobe.kp);
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2005-11-07 09:00:11 +00:00
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kcb->kprobe_status = kcb->prev_kprobe.status;
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kcb->kprobe_orig_tnpc = kcb->prev_kprobe.orig_tnpc;
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kcb->kprobe_orig_tstate_pil = kcb->prev_kprobe.orig_tstate_pil;
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2005-06-23 07:09:39 +00:00
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}
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2006-04-19 05:22:03 +00:00
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static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
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2005-11-07 09:00:11 +00:00
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struct kprobe_ctlblk *kcb)
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2005-04-16 22:20:36 +00:00
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{
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sparc: Replace __get_cpu_var uses
__get_cpu_var() is used for multiple purposes in the kernel source. One of
them is address calculation via the form &__get_cpu_var(x). This calculates
the address for the instance of the percpu variable of the current processor
based on an offset.
Other use cases are for storing and retrieving data from the current
processors percpu area. __get_cpu_var() can be used as an lvalue when
writing data or on the right side of an assignment.
__get_cpu_var() is defined as :
#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
__get_cpu_var() always only does an address determination. However, store
and retrieve operations could use a segment prefix (or global register on
other platforms) to avoid the address calculation.
this_cpu_write() and this_cpu_read() can directly take an offset into a
percpu area and use optimized assembly code to read and write per cpu
variables.
This patch converts __get_cpu_var into either an explicit address
calculation using this_cpu_ptr() or into a use of this_cpu operations that
use the offset. Thereby address calculations are avoided and less registers
are used when code is generated.
At the end of the patch set all uses of __get_cpu_var have been removed so
the macro is removed too.
The patch set includes passes over all arches as well. Once these operations
are used throughout then specialized macros can be defined in non -x86
arches as well in order to optimize per cpu access by f.e. using a global
register that may be set to the per cpu base.
Transformations done to __get_cpu_var()
1. Determine the address of the percpu instance of the current processor.
DEFINE_PER_CPU(int, y);
int *x = &__get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(&y);
2. Same as #1 but this time an array structure is involved.
DEFINE_PER_CPU(int, y[20]);
int *x = __get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(y);
3. Retrieve the content of the current processors instance of a per cpu
variable.
DEFINE_PER_CPU(int, y);
int x = __get_cpu_var(y)
Converts to
int x = __this_cpu_read(y);
4. Retrieve the content of a percpu struct
DEFINE_PER_CPU(struct mystruct, y);
struct mystruct x = __get_cpu_var(y);
Converts to
memcpy(&x, this_cpu_ptr(&y), sizeof(x));
5. Assignment to a per cpu variable
DEFINE_PER_CPU(int, y)
__get_cpu_var(y) = x;
Converts to
__this_cpu_write(y, x);
6. Increment/Decrement etc of a per cpu variable
DEFINE_PER_CPU(int, y);
__get_cpu_var(y)++
Converts to
__this_cpu_inc(y)
Cc: sparclinux@vger.kernel.org
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
2014-08-17 17:30:54 +00:00
|
|
|
__this_cpu_write(current_kprobe, p);
|
2005-11-07 09:00:11 +00:00
|
|
|
kcb->kprobe_orig_tnpc = regs->tnpc;
|
|
|
|
|
kcb->kprobe_orig_tstate_pil = (regs->tstate & TSTATE_PIL);
|
2005-06-23 07:09:39 +00:00
|
|
|
}
|
|
|
|
|
|
2006-04-19 05:22:03 +00:00
|
|
|
static void __kprobes prepare_singlestep(struct kprobe *p, struct pt_regs *regs,
|
2005-11-07 09:00:11 +00:00
|
|
|
struct kprobe_ctlblk *kcb)
|
2005-06-23 07:09:39 +00:00
|
|
|
{
|
2005-04-16 22:20:36 +00:00
|
|
|
regs->tstate |= TSTATE_PIL;
|
|
|
|
|
|
|
|
|
|
/*single step inline, if it a breakpoint instruction*/
|
|
|
|
|
if (p->opcode == BREAKPOINT_INSTRUCTION) {
|
|
|
|
|
regs->tpc = (unsigned long) p->addr;
|
2005-11-07 09:00:11 +00:00
|
|
|
regs->tnpc = kcb->kprobe_orig_tnpc;
|
2005-04-16 22:20:36 +00:00
|
|
|
} else {
|
|
|
|
|
regs->tpc = (unsigned long) &p->ainsn.insn[0];
|
|
|
|
|
regs->tnpc = (unsigned long) &p->ainsn.insn[1];
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2005-09-06 22:19:30 +00:00
|
|
|
static int __kprobes kprobe_handler(struct pt_regs *regs)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
|
struct kprobe *p;
|
|
|
|
|
void *addr = (void *) regs->tpc;
|
|
|
|
|
int ret = 0;
|
2005-11-07 09:00:14 +00:00
|
|
|
struct kprobe_ctlblk *kcb;
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* We don't want to be preempted for the entire
|
|
|
|
|
* duration of kprobe processing
|
|
|
|
|
*/
|
|
|
|
|
preempt_disable();
|
|
|
|
|
kcb = get_kprobe_ctlblk();
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
if (kprobe_running()) {
|
|
|
|
|
p = get_kprobe(addr);
|
|
|
|
|
if (p) {
|
2005-11-07 09:00:11 +00:00
|
|
|
if (kcb->kprobe_status == KPROBE_HIT_SS) {
|
2005-04-16 22:20:36 +00:00
|
|
|
regs->tstate = ((regs->tstate & ~TSTATE_PIL) |
|
2005-11-07 09:00:11 +00:00
|
|
|
kcb->kprobe_orig_tstate_pil);
|
2005-04-16 22:20:36 +00:00
|
|
|
goto no_kprobe;
|
|
|
|
|
}
|
2005-06-23 07:09:39 +00:00
|
|
|
/* We have reentered the kprobe_handler(), since
|
|
|
|
|
* another probe was hit while within the handler.
|
|
|
|
|
* We here save the original kprobes variables and
|
|
|
|
|
* just single step on the instruction of the new probe
|
|
|
|
|
* without calling any user handlers.
|
|
|
|
|
*/
|
2005-11-07 09:00:11 +00:00
|
|
|
save_previous_kprobe(kcb);
|
|
|
|
|
set_current_kprobe(p, regs, kcb);
|
2005-12-12 08:37:34 +00:00
|
|
|
kprobes_inc_nmissed_count(p);
|
2005-11-07 09:00:11 +00:00
|
|
|
kcb->kprobe_status = KPROBE_REENTER;
|
|
|
|
|
prepare_singlestep(p, regs, kcb);
|
2005-06-23 07:09:39 +00:00
|
|
|
return 1;
|
2005-04-16 22:20:36 +00:00
|
|
|
} else {
|
2006-01-11 20:17:42 +00:00
|
|
|
if (*(u32 *)addr != BREAKPOINT_INSTRUCTION) {
|
|
|
|
|
/* The breakpoint instruction was removed by
|
|
|
|
|
* another cpu right after we hit, no further
|
|
|
|
|
* handling of this interrupt is appropriate
|
|
|
|
|
*/
|
|
|
|
|
ret = 1;
|
|
|
|
|
goto no_kprobe;
|
|
|
|
|
}
|
sparc: Replace __get_cpu_var uses
__get_cpu_var() is used for multiple purposes in the kernel source. One of
them is address calculation via the form &__get_cpu_var(x). This calculates
the address for the instance of the percpu variable of the current processor
based on an offset.
Other use cases are for storing and retrieving data from the current
processors percpu area. __get_cpu_var() can be used as an lvalue when
writing data or on the right side of an assignment.
__get_cpu_var() is defined as :
#define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
__get_cpu_var() always only does an address determination. However, store
and retrieve operations could use a segment prefix (or global register on
other platforms) to avoid the address calculation.
this_cpu_write() and this_cpu_read() can directly take an offset into a
percpu area and use optimized assembly code to read and write per cpu
variables.
This patch converts __get_cpu_var into either an explicit address
calculation using this_cpu_ptr() or into a use of this_cpu operations that
use the offset. Thereby address calculations are avoided and less registers
are used when code is generated.
At the end of the patch set all uses of __get_cpu_var have been removed so
the macro is removed too.
The patch set includes passes over all arches as well. Once these operations
are used throughout then specialized macros can be defined in non -x86
arches as well in order to optimize per cpu access by f.e. using a global
register that may be set to the per cpu base.
Transformations done to __get_cpu_var()
1. Determine the address of the percpu instance of the current processor.
DEFINE_PER_CPU(int, y);
int *x = &__get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(&y);
2. Same as #1 but this time an array structure is involved.
DEFINE_PER_CPU(int, y[20]);
int *x = __get_cpu_var(y);
Converts to
int *x = this_cpu_ptr(y);
3. Retrieve the content of the current processors instance of a per cpu
variable.
DEFINE_PER_CPU(int, y);
int x = __get_cpu_var(y)
Converts to
int x = __this_cpu_read(y);
4. Retrieve the content of a percpu struct
DEFINE_PER_CPU(struct mystruct, y);
struct mystruct x = __get_cpu_var(y);
Converts to
memcpy(&x, this_cpu_ptr(&y), sizeof(x));
5. Assignment to a per cpu variable
DEFINE_PER_CPU(int, y)
__get_cpu_var(y) = x;
Converts to
__this_cpu_write(y, x);
6. Increment/Decrement etc of a per cpu variable
DEFINE_PER_CPU(int, y);
__get_cpu_var(y)++
Converts to
__this_cpu_inc(y)
Cc: sparclinux@vger.kernel.org
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
2014-08-17 17:30:54 +00:00
|
|
|
p = __this_cpu_read(current_kprobe);
|
2005-04-16 22:20:36 +00:00
|
|
|
if (p->break_handler && p->break_handler(p, regs))
|
|
|
|
|
goto ss_probe;
|
|
|
|
|
}
|
|
|
|
|
goto no_kprobe;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
p = get_kprobe(addr);
|
|
|
|
|
if (!p) {
|
|
|
|
|
if (*(u32 *)addr != BREAKPOINT_INSTRUCTION) {
|
|
|
|
|
/*
|
|
|
|
|
* The breakpoint instruction was removed right
|
|
|
|
|
* after we hit it. Another cpu has removed
|
|
|
|
|
* either a probepoint or a debugger breakpoint
|
|
|
|
|
* at this address. In either case, no further
|
|
|
|
|
* handling of this interrupt is appropriate.
|
|
|
|
|
*/
|
|
|
|
|
ret = 1;
|
|
|
|
|
}
|
|
|
|
|
/* Not one of ours: let kernel handle it */
|
|
|
|
|
goto no_kprobe;
|
|
|
|
|
}
|
|
|
|
|
|
2005-11-07 09:00:11 +00:00
|
|
|
set_current_kprobe(p, regs, kcb);
|
|
|
|
|
kcb->kprobe_status = KPROBE_HIT_ACTIVE;
|
2005-04-16 22:20:36 +00:00
|
|
|
if (p->pre_handler && p->pre_handler(p, regs))
|
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
|
|
ss_probe:
|
2005-11-07 09:00:11 +00:00
|
|
|
prepare_singlestep(p, regs, kcb);
|
|
|
|
|
kcb->kprobe_status = KPROBE_HIT_SS;
|
2005-04-16 22:20:36 +00:00
|
|
|
return 1;
|
|
|
|
|
|
|
|
|
|
no_kprobe:
|
2005-11-07 09:00:14 +00:00
|
|
|
preempt_enable_no_resched();
|
2005-04-16 22:20:36 +00:00
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* If INSN is a relative control transfer instruction,
|
|
|
|
|
* return the corrected branch destination value.
|
|
|
|
|
*
|
[SPARC64]: Fix several kprobes bugs.
- relbranch_fixup(), for non-branches, would end up setting
regs->tnpc incorrectly, in fact it would set it equal to
regs->tpc which would cause that instruction to execute twice
Also, if this is not a PC-relative branch, we should just
leave regs->tnpc as-is. This covers cases like 'jmpl' which
branch to absolute values.
- To be absolutely %100 safe, we need to flush the instruction
cache for all assignments to kprobe->ainsn.insn[], including
cases like add_aggr_kprobe()
- prev_kprobe's status field needs to be 'unsigned long' to match
the type of the value it is saving
- jprobes were totally broken:
= jprobe_return() can run in the stack frame of the jprobe handler,
or in an even deeper stack frame, thus we'll be in the wrong
register window than the one from the original probe state.
So unwind using 'restore' instructions, if necessary, right
before we do the jprobe_return() breakpoint trap.
= There is no reason to save/restore the register window saved
at %sp at jprobe trigger time. Those registers cannot be
modified by the jprobe handler. Also, this code was saving
and restoring "sizeof (struct sparc_stackf)" bytes. Depending
upon the caller, this could clobber unrelated stack frame
pieces if there is only a basic 128-byte register window
stored on the stack, without the argument save area.
So just saving and restoring struct pt_regs is sufficient.
= Kill the "jprobe_saved_esp", totally unused.
Also, delete "jprobe_saved_regs_location", with the stack frame
unwind now done explicitly by jprobe_return(), this check is
superfluous.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-10 10:42:03 +00:00
|
|
|
* regs->tpc and regs->tnpc still hold the values of the
|
|
|
|
|
* program counters at the time of trap due to the execution
|
|
|
|
|
* of the BREAKPOINT_INSTRUCTION_2 at p->ainsn.insn[1]
|
|
|
|
|
*
|
2005-04-16 22:20:36 +00:00
|
|
|
*/
|
[SPARC64]: Fix several kprobes bugs.
- relbranch_fixup(), for non-branches, would end up setting
regs->tnpc incorrectly, in fact it would set it equal to
regs->tpc which would cause that instruction to execute twice
Also, if this is not a PC-relative branch, we should just
leave regs->tnpc as-is. This covers cases like 'jmpl' which
branch to absolute values.
- To be absolutely %100 safe, we need to flush the instruction
cache for all assignments to kprobe->ainsn.insn[], including
cases like add_aggr_kprobe()
- prev_kprobe's status field needs to be 'unsigned long' to match
the type of the value it is saving
- jprobes were totally broken:
= jprobe_return() can run in the stack frame of the jprobe handler,
or in an even deeper stack frame, thus we'll be in the wrong
register window than the one from the original probe state.
So unwind using 'restore' instructions, if necessary, right
before we do the jprobe_return() breakpoint trap.
= There is no reason to save/restore the register window saved
at %sp at jprobe trigger time. Those registers cannot be
modified by the jprobe handler. Also, this code was saving
and restoring "sizeof (struct sparc_stackf)" bytes. Depending
upon the caller, this could clobber unrelated stack frame
pieces if there is only a basic 128-byte register window
stored on the stack, without the argument save area.
So just saving and restoring struct pt_regs is sufficient.
= Kill the "jprobe_saved_esp", totally unused.
Also, delete "jprobe_saved_regs_location", with the stack frame
unwind now done explicitly by jprobe_return(), this check is
superfluous.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-10 10:42:03 +00:00
|
|
|
static unsigned long __kprobes relbranch_fixup(u32 insn, struct kprobe *p,
|
|
|
|
|
struct pt_regs *regs)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
[SPARC64]: Fix several kprobes bugs.
- relbranch_fixup(), for non-branches, would end up setting
regs->tnpc incorrectly, in fact it would set it equal to
regs->tpc which would cause that instruction to execute twice
Also, if this is not a PC-relative branch, we should just
leave regs->tnpc as-is. This covers cases like 'jmpl' which
branch to absolute values.
- To be absolutely %100 safe, we need to flush the instruction
cache for all assignments to kprobe->ainsn.insn[], including
cases like add_aggr_kprobe()
- prev_kprobe's status field needs to be 'unsigned long' to match
the type of the value it is saving
- jprobes were totally broken:
= jprobe_return() can run in the stack frame of the jprobe handler,
or in an even deeper stack frame, thus we'll be in the wrong
register window than the one from the original probe state.
So unwind using 'restore' instructions, if necessary, right
before we do the jprobe_return() breakpoint trap.
= There is no reason to save/restore the register window saved
at %sp at jprobe trigger time. Those registers cannot be
modified by the jprobe handler. Also, this code was saving
and restoring "sizeof (struct sparc_stackf)" bytes. Depending
upon the caller, this could clobber unrelated stack frame
pieces if there is only a basic 128-byte register window
stored on the stack, without the argument save area.
So just saving and restoring struct pt_regs is sufficient.
= Kill the "jprobe_saved_esp", totally unused.
Also, delete "jprobe_saved_regs_location", with the stack frame
unwind now done explicitly by jprobe_return(), this check is
superfluous.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-10 10:42:03 +00:00
|
|
|
unsigned long real_pc = (unsigned long) p->addr;
|
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
/* Branch not taken, no mods necessary. */
|
[SPARC64]: Fix several kprobes bugs.
- relbranch_fixup(), for non-branches, would end up setting
regs->tnpc incorrectly, in fact it would set it equal to
regs->tpc which would cause that instruction to execute twice
Also, if this is not a PC-relative branch, we should just
leave regs->tnpc as-is. This covers cases like 'jmpl' which
branch to absolute values.
- To be absolutely %100 safe, we need to flush the instruction
cache for all assignments to kprobe->ainsn.insn[], including
cases like add_aggr_kprobe()
- prev_kprobe's status field needs to be 'unsigned long' to match
the type of the value it is saving
- jprobes were totally broken:
= jprobe_return() can run in the stack frame of the jprobe handler,
or in an even deeper stack frame, thus we'll be in the wrong
register window than the one from the original probe state.
So unwind using 'restore' instructions, if necessary, right
before we do the jprobe_return() breakpoint trap.
= There is no reason to save/restore the register window saved
at %sp at jprobe trigger time. Those registers cannot be
modified by the jprobe handler. Also, this code was saving
and restoring "sizeof (struct sparc_stackf)" bytes. Depending
upon the caller, this could clobber unrelated stack frame
pieces if there is only a basic 128-byte register window
stored on the stack, without the argument save area.
So just saving and restoring struct pt_regs is sufficient.
= Kill the "jprobe_saved_esp", totally unused.
Also, delete "jprobe_saved_regs_location", with the stack frame
unwind now done explicitly by jprobe_return(), this check is
superfluous.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-10 10:42:03 +00:00
|
|
|
if (regs->tnpc == regs->tpc + 0x4UL)
|
|
|
|
|
return real_pc + 0x8UL;
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
/* The three cases are call, branch w/prediction,
|
|
|
|
|
* and traditional branch.
|
|
|
|
|
*/
|
|
|
|
|
if ((insn & 0xc0000000) == 0x40000000 ||
|
|
|
|
|
(insn & 0xc1c00000) == 0x00400000 ||
|
|
|
|
|
(insn & 0xc1c00000) == 0x00800000) {
|
[SPARC64]: Fix several kprobes bugs.
- relbranch_fixup(), for non-branches, would end up setting
regs->tnpc incorrectly, in fact it would set it equal to
regs->tpc which would cause that instruction to execute twice
Also, if this is not a PC-relative branch, we should just
leave regs->tnpc as-is. This covers cases like 'jmpl' which
branch to absolute values.
- To be absolutely %100 safe, we need to flush the instruction
cache for all assignments to kprobe->ainsn.insn[], including
cases like add_aggr_kprobe()
- prev_kprobe's status field needs to be 'unsigned long' to match
the type of the value it is saving
- jprobes were totally broken:
= jprobe_return() can run in the stack frame of the jprobe handler,
or in an even deeper stack frame, thus we'll be in the wrong
register window than the one from the original probe state.
So unwind using 'restore' instructions, if necessary, right
before we do the jprobe_return() breakpoint trap.
= There is no reason to save/restore the register window saved
at %sp at jprobe trigger time. Those registers cannot be
modified by the jprobe handler. Also, this code was saving
and restoring "sizeof (struct sparc_stackf)" bytes. Depending
upon the caller, this could clobber unrelated stack frame
pieces if there is only a basic 128-byte register window
stored on the stack, without the argument save area.
So just saving and restoring struct pt_regs is sufficient.
= Kill the "jprobe_saved_esp", totally unused.
Also, delete "jprobe_saved_regs_location", with the stack frame
unwind now done explicitly by jprobe_return(), this check is
superfluous.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-10 10:42:03 +00:00
|
|
|
unsigned long ainsn_addr;
|
|
|
|
|
|
|
|
|
|
ainsn_addr = (unsigned long) &p->ainsn.insn[0];
|
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
/* The instruction did all the work for us
|
|
|
|
|
* already, just apply the offset to the correct
|
|
|
|
|
* instruction location.
|
|
|
|
|
*/
|
[SPARC64]: Fix several kprobes bugs.
- relbranch_fixup(), for non-branches, would end up setting
regs->tnpc incorrectly, in fact it would set it equal to
regs->tpc which would cause that instruction to execute twice
Also, if this is not a PC-relative branch, we should just
leave regs->tnpc as-is. This covers cases like 'jmpl' which
branch to absolute values.
- To be absolutely %100 safe, we need to flush the instruction
cache for all assignments to kprobe->ainsn.insn[], including
cases like add_aggr_kprobe()
- prev_kprobe's status field needs to be 'unsigned long' to match
the type of the value it is saving
- jprobes were totally broken:
= jprobe_return() can run in the stack frame of the jprobe handler,
or in an even deeper stack frame, thus we'll be in the wrong
register window than the one from the original probe state.
So unwind using 'restore' instructions, if necessary, right
before we do the jprobe_return() breakpoint trap.
= There is no reason to save/restore the register window saved
at %sp at jprobe trigger time. Those registers cannot be
modified by the jprobe handler. Also, this code was saving
and restoring "sizeof (struct sparc_stackf)" bytes. Depending
upon the caller, this could clobber unrelated stack frame
pieces if there is only a basic 128-byte register window
stored on the stack, without the argument save area.
So just saving and restoring struct pt_regs is sufficient.
= Kill the "jprobe_saved_esp", totally unused.
Also, delete "jprobe_saved_regs_location", with the stack frame
unwind now done explicitly by jprobe_return(), this check is
superfluous.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-10 10:42:03 +00:00
|
|
|
return (real_pc + (regs->tnpc - ainsn_addr));
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
[SPARC64]: Fix several kprobes bugs.
- relbranch_fixup(), for non-branches, would end up setting
regs->tnpc incorrectly, in fact it would set it equal to
regs->tpc which would cause that instruction to execute twice
Also, if this is not a PC-relative branch, we should just
leave regs->tnpc as-is. This covers cases like 'jmpl' which
branch to absolute values.
- To be absolutely %100 safe, we need to flush the instruction
cache for all assignments to kprobe->ainsn.insn[], including
cases like add_aggr_kprobe()
- prev_kprobe's status field needs to be 'unsigned long' to match
the type of the value it is saving
- jprobes were totally broken:
= jprobe_return() can run in the stack frame of the jprobe handler,
or in an even deeper stack frame, thus we'll be in the wrong
register window than the one from the original probe state.
So unwind using 'restore' instructions, if necessary, right
before we do the jprobe_return() breakpoint trap.
= There is no reason to save/restore the register window saved
at %sp at jprobe trigger time. Those registers cannot be
modified by the jprobe handler. Also, this code was saving
and restoring "sizeof (struct sparc_stackf)" bytes. Depending
upon the caller, this could clobber unrelated stack frame
pieces if there is only a basic 128-byte register window
stored on the stack, without the argument save area.
So just saving and restoring struct pt_regs is sufficient.
= Kill the "jprobe_saved_esp", totally unused.
Also, delete "jprobe_saved_regs_location", with the stack frame
unwind now done explicitly by jprobe_return(), this check is
superfluous.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-10 10:42:03 +00:00
|
|
|
/* It is jmpl or some other absolute PC modification instruction,
|
|
|
|
|
* leave NPC as-is.
|
|
|
|
|
*/
|
|
|
|
|
return regs->tnpc;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* If INSN is an instruction which writes it's PC location
|
|
|
|
|
* into a destination register, fix that up.
|
|
|
|
|
*/
|
2005-09-06 22:19:30 +00:00
|
|
|
static void __kprobes retpc_fixup(struct pt_regs *regs, u32 insn,
|
|
|
|
|
unsigned long real_pc)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
|
unsigned long *slot = NULL;
|
|
|
|
|
|
[SPARC64]: Fix several kprobes bugs.
- relbranch_fixup(), for non-branches, would end up setting
regs->tnpc incorrectly, in fact it would set it equal to
regs->tpc which would cause that instruction to execute twice
Also, if this is not a PC-relative branch, we should just
leave regs->tnpc as-is. This covers cases like 'jmpl' which
branch to absolute values.
- To be absolutely %100 safe, we need to flush the instruction
cache for all assignments to kprobe->ainsn.insn[], including
cases like add_aggr_kprobe()
- prev_kprobe's status field needs to be 'unsigned long' to match
the type of the value it is saving
- jprobes were totally broken:
= jprobe_return() can run in the stack frame of the jprobe handler,
or in an even deeper stack frame, thus we'll be in the wrong
register window than the one from the original probe state.
So unwind using 'restore' instructions, if necessary, right
before we do the jprobe_return() breakpoint trap.
= There is no reason to save/restore the register window saved
at %sp at jprobe trigger time. Those registers cannot be
modified by the jprobe handler. Also, this code was saving
and restoring "sizeof (struct sparc_stackf)" bytes. Depending
upon the caller, this could clobber unrelated stack frame
pieces if there is only a basic 128-byte register window
stored on the stack, without the argument save area.
So just saving and restoring struct pt_regs is sufficient.
= Kill the "jprobe_saved_esp", totally unused.
Also, delete "jprobe_saved_regs_location", with the stack frame
unwind now done explicitly by jprobe_return(), this check is
superfluous.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-10 10:42:03 +00:00
|
|
|
/* Simplest case is 'call', which always uses %o7 */
|
2005-04-16 22:20:36 +00:00
|
|
|
if ((insn & 0xc0000000) == 0x40000000) {
|
|
|
|
|
slot = ®s->u_regs[UREG_I7];
|
|
|
|
|
}
|
|
|
|
|
|
[SPARC64]: Fix several kprobes bugs.
- relbranch_fixup(), for non-branches, would end up setting
regs->tnpc incorrectly, in fact it would set it equal to
regs->tpc which would cause that instruction to execute twice
Also, if this is not a PC-relative branch, we should just
leave regs->tnpc as-is. This covers cases like 'jmpl' which
branch to absolute values.
- To be absolutely %100 safe, we need to flush the instruction
cache for all assignments to kprobe->ainsn.insn[], including
cases like add_aggr_kprobe()
- prev_kprobe's status field needs to be 'unsigned long' to match
the type of the value it is saving
- jprobes were totally broken:
= jprobe_return() can run in the stack frame of the jprobe handler,
or in an even deeper stack frame, thus we'll be in the wrong
register window than the one from the original probe state.
So unwind using 'restore' instructions, if necessary, right
before we do the jprobe_return() breakpoint trap.
= There is no reason to save/restore the register window saved
at %sp at jprobe trigger time. Those registers cannot be
modified by the jprobe handler. Also, this code was saving
and restoring "sizeof (struct sparc_stackf)" bytes. Depending
upon the caller, this could clobber unrelated stack frame
pieces if there is only a basic 128-byte register window
stored on the stack, without the argument save area.
So just saving and restoring struct pt_regs is sufficient.
= Kill the "jprobe_saved_esp", totally unused.
Also, delete "jprobe_saved_regs_location", with the stack frame
unwind now done explicitly by jprobe_return(), this check is
superfluous.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-10 10:42:03 +00:00
|
|
|
/* 'jmpl' encodes the register inside of the opcode */
|
2005-04-16 22:20:36 +00:00
|
|
|
if ((insn & 0xc1f80000) == 0x81c00000) {
|
|
|
|
|
unsigned long rd = ((insn >> 25) & 0x1f);
|
|
|
|
|
|
|
|
|
|
if (rd <= 15) {
|
|
|
|
|
slot = ®s->u_regs[rd];
|
|
|
|
|
} else {
|
|
|
|
|
/* Hard case, it goes onto the stack. */
|
|
|
|
|
flushw_all();
|
|
|
|
|
|
|
|
|
|
rd -= 16;
|
|
|
|
|
slot = (unsigned long *)
|
|
|
|
|
(regs->u_regs[UREG_FP] + STACK_BIAS);
|
|
|
|
|
slot += rd;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
if (slot != NULL)
|
|
|
|
|
*slot = real_pc;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Called after single-stepping. p->addr is the address of the
|
[SPARC64]: Fix several kprobes bugs.
- relbranch_fixup(), for non-branches, would end up setting
regs->tnpc incorrectly, in fact it would set it equal to
regs->tpc which would cause that instruction to execute twice
Also, if this is not a PC-relative branch, we should just
leave regs->tnpc as-is. This covers cases like 'jmpl' which
branch to absolute values.
- To be absolutely %100 safe, we need to flush the instruction
cache for all assignments to kprobe->ainsn.insn[], including
cases like add_aggr_kprobe()
- prev_kprobe's status field needs to be 'unsigned long' to match
the type of the value it is saving
- jprobes were totally broken:
= jprobe_return() can run in the stack frame of the jprobe handler,
or in an even deeper stack frame, thus we'll be in the wrong
register window than the one from the original probe state.
So unwind using 'restore' instructions, if necessary, right
before we do the jprobe_return() breakpoint trap.
= There is no reason to save/restore the register window saved
at %sp at jprobe trigger time. Those registers cannot be
modified by the jprobe handler. Also, this code was saving
and restoring "sizeof (struct sparc_stackf)" bytes. Depending
upon the caller, this could clobber unrelated stack frame
pieces if there is only a basic 128-byte register window
stored on the stack, without the argument save area.
So just saving and restoring struct pt_regs is sufficient.
= Kill the "jprobe_saved_esp", totally unused.
Also, delete "jprobe_saved_regs_location", with the stack frame
unwind now done explicitly by jprobe_return(), this check is
superfluous.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-10 10:42:03 +00:00
|
|
|
* instruction which has been replaced by the breakpoint
|
2005-04-16 22:20:36 +00:00
|
|
|
* instruction. To avoid the SMP problems that can occur when we
|
|
|
|
|
* temporarily put back the original opcode to single-step, we
|
|
|
|
|
* single-stepped a copy of the instruction. The address of this
|
[SPARC64]: Fix several kprobes bugs.
- relbranch_fixup(), for non-branches, would end up setting
regs->tnpc incorrectly, in fact it would set it equal to
regs->tpc which would cause that instruction to execute twice
Also, if this is not a PC-relative branch, we should just
leave regs->tnpc as-is. This covers cases like 'jmpl' which
branch to absolute values.
- To be absolutely %100 safe, we need to flush the instruction
cache for all assignments to kprobe->ainsn.insn[], including
cases like add_aggr_kprobe()
- prev_kprobe's status field needs to be 'unsigned long' to match
the type of the value it is saving
- jprobes were totally broken:
= jprobe_return() can run in the stack frame of the jprobe handler,
or in an even deeper stack frame, thus we'll be in the wrong
register window than the one from the original probe state.
So unwind using 'restore' instructions, if necessary, right
before we do the jprobe_return() breakpoint trap.
= There is no reason to save/restore the register window saved
at %sp at jprobe trigger time. Those registers cannot be
modified by the jprobe handler. Also, this code was saving
and restoring "sizeof (struct sparc_stackf)" bytes. Depending
upon the caller, this could clobber unrelated stack frame
pieces if there is only a basic 128-byte register window
stored on the stack, without the argument save area.
So just saving and restoring struct pt_regs is sufficient.
= Kill the "jprobe_saved_esp", totally unused.
Also, delete "jprobe_saved_regs_location", with the stack frame
unwind now done explicitly by jprobe_return(), this check is
superfluous.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-10 10:42:03 +00:00
|
|
|
* copy is &p->ainsn.insn[0].
|
2005-04-16 22:20:36 +00:00
|
|
|
*
|
|
|
|
|
* This function prepares to return from the post-single-step
|
|
|
|
|
* breakpoint trap.
|
|
|
|
|
*/
|
2005-11-07 09:00:11 +00:00
|
|
|
static void __kprobes resume_execution(struct kprobe *p,
|
|
|
|
|
struct pt_regs *regs, struct kprobe_ctlblk *kcb)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
|
u32 insn = p->ainsn.insn[0];
|
|
|
|
|
|
[SPARC64]: Fix several kprobes bugs.
- relbranch_fixup(), for non-branches, would end up setting
regs->tnpc incorrectly, in fact it would set it equal to
regs->tpc which would cause that instruction to execute twice
Also, if this is not a PC-relative branch, we should just
leave regs->tnpc as-is. This covers cases like 'jmpl' which
branch to absolute values.
- To be absolutely %100 safe, we need to flush the instruction
cache for all assignments to kprobe->ainsn.insn[], including
cases like add_aggr_kprobe()
- prev_kprobe's status field needs to be 'unsigned long' to match
the type of the value it is saving
- jprobes were totally broken:
= jprobe_return() can run in the stack frame of the jprobe handler,
or in an even deeper stack frame, thus we'll be in the wrong
register window than the one from the original probe state.
So unwind using 'restore' instructions, if necessary, right
before we do the jprobe_return() breakpoint trap.
= There is no reason to save/restore the register window saved
at %sp at jprobe trigger time. Those registers cannot be
modified by the jprobe handler. Also, this code was saving
and restoring "sizeof (struct sparc_stackf)" bytes. Depending
upon the caller, this could clobber unrelated stack frame
pieces if there is only a basic 128-byte register window
stored on the stack, without the argument save area.
So just saving and restoring struct pt_regs is sufficient.
= Kill the "jprobe_saved_esp", totally unused.
Also, delete "jprobe_saved_regs_location", with the stack frame
unwind now done explicitly by jprobe_return(), this check is
superfluous.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-10 10:42:03 +00:00
|
|
|
regs->tnpc = relbranch_fixup(insn, p, regs);
|
|
|
|
|
|
|
|
|
|
/* This assignment must occur after relbranch_fixup() */
|
2005-11-07 09:00:11 +00:00
|
|
|
regs->tpc = kcb->kprobe_orig_tnpc;
|
[SPARC64]: Fix several kprobes bugs.
- relbranch_fixup(), for non-branches, would end up setting
regs->tnpc incorrectly, in fact it would set it equal to
regs->tpc which would cause that instruction to execute twice
Also, if this is not a PC-relative branch, we should just
leave regs->tnpc as-is. This covers cases like 'jmpl' which
branch to absolute values.
- To be absolutely %100 safe, we need to flush the instruction
cache for all assignments to kprobe->ainsn.insn[], including
cases like add_aggr_kprobe()
- prev_kprobe's status field needs to be 'unsigned long' to match
the type of the value it is saving
- jprobes were totally broken:
= jprobe_return() can run in the stack frame of the jprobe handler,
or in an even deeper stack frame, thus we'll be in the wrong
register window than the one from the original probe state.
So unwind using 'restore' instructions, if necessary, right
before we do the jprobe_return() breakpoint trap.
= There is no reason to save/restore the register window saved
at %sp at jprobe trigger time. Those registers cannot be
modified by the jprobe handler. Also, this code was saving
and restoring "sizeof (struct sparc_stackf)" bytes. Depending
upon the caller, this could clobber unrelated stack frame
pieces if there is only a basic 128-byte register window
stored on the stack, without the argument save area.
So just saving and restoring struct pt_regs is sufficient.
= Kill the "jprobe_saved_esp", totally unused.
Also, delete "jprobe_saved_regs_location", with the stack frame
unwind now done explicitly by jprobe_return(), this check is
superfluous.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-10 10:42:03 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
retpc_fixup(regs, insn, (unsigned long) p->addr);
|
|
|
|
|
|
|
|
|
|
regs->tstate = ((regs->tstate & ~TSTATE_PIL) |
|
2005-11-07 09:00:11 +00:00
|
|
|
kcb->kprobe_orig_tstate_pil);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
2006-04-19 05:22:03 +00:00
|
|
|
static int __kprobes post_kprobe_handler(struct pt_regs *regs)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2005-11-07 09:00:11 +00:00
|
|
|
struct kprobe *cur = kprobe_running();
|
|
|
|
|
struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
|
|
|
|
|
|
|
|
|
|
if (!cur)
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
|
|
2005-11-07 09:00:11 +00:00
|
|
|
if ((kcb->kprobe_status != KPROBE_REENTER) && cur->post_handler) {
|
|
|
|
|
kcb->kprobe_status = KPROBE_HIT_SSDONE;
|
|
|
|
|
cur->post_handler(cur, regs, 0);
|
2005-06-23 07:09:39 +00:00
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-11-07 09:00:11 +00:00
|
|
|
resume_execution(cur, regs, kcb);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-06-23 07:09:39 +00:00
|
|
|
/*Restore back the original saved kprobes variables and continue. */
|
2005-11-07 09:00:11 +00:00
|
|
|
if (kcb->kprobe_status == KPROBE_REENTER) {
|
|
|
|
|
restore_previous_kprobe(kcb);
|
2005-06-23 07:09:39 +00:00
|
|
|
goto out;
|
|
|
|
|
}
|
2005-11-07 09:00:11 +00:00
|
|
|
reset_current_kprobe();
|
2005-06-23 07:09:39 +00:00
|
|
|
out:
|
2005-04-16 22:20:36 +00:00
|
|
|
preempt_enable_no_resched();
|
|
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
2007-05-09 01:25:14 +00:00
|
|
|
int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2005-11-07 09:00:11 +00:00
|
|
|
struct kprobe *cur = kprobe_running();
|
|
|
|
|
struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
|
2006-03-26 09:38:26 +00:00
|
|
|
const struct exception_table_entry *entry;
|
|
|
|
|
|
|
|
|
|
switch(kcb->kprobe_status) {
|
|
|
|
|
case KPROBE_HIT_SS:
|
|
|
|
|
case KPROBE_REENTER:
|
|
|
|
|
/*
|
|
|
|
|
* We are here because the instruction being single
|
|
|
|
|
* stepped caused a page fault. We reset the current
|
|
|
|
|
* kprobe and the tpc points back to the probe address
|
|
|
|
|
* and allow the page fault handler to continue as a
|
|
|
|
|
* normal page fault.
|
|
|
|
|
*/
|
|
|
|
|
regs->tpc = (unsigned long)cur->addr;
|
|
|
|
|
regs->tnpc = kcb->kprobe_orig_tnpc;
|
|
|
|
|
regs->tstate = ((regs->tstate & ~TSTATE_PIL) |
|
|
|
|
|
kcb->kprobe_orig_tstate_pil);
|
|
|
|
|
if (kcb->kprobe_status == KPROBE_REENTER)
|
|
|
|
|
restore_previous_kprobe(kcb);
|
|
|
|
|
else
|
|
|
|
|
reset_current_kprobe();
|
|
|
|
|
preempt_enable_no_resched();
|
|
|
|
|
break;
|
|
|
|
|
case KPROBE_HIT_ACTIVE:
|
|
|
|
|
case KPROBE_HIT_SSDONE:
|
|
|
|
|
/*
|
|
|
|
|
* We increment the nmissed count for accounting,
|
2013-09-20 03:55:41 +00:00
|
|
|
* we can also use npre/npostfault count for accounting
|
2006-03-26 09:38:26 +00:00
|
|
|
* these specific fault cases.
|
|
|
|
|
*/
|
|
|
|
|
kprobes_inc_nmissed_count(cur);
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* We come here because instructions in the pre/post
|
|
|
|
|
* handler caused the page_fault, this could happen
|
|
|
|
|
* if handler tries to access user space by
|
|
|
|
|
* copy_from_user(), get_user() etc. Let the
|
|
|
|
|
* user-specified handler try to fix it first.
|
|
|
|
|
*/
|
|
|
|
|
if (cur->fault_handler && cur->fault_handler(cur, regs, trapnr))
|
|
|
|
|
return 1;
|
2005-11-07 09:00:11 +00:00
|
|
|
|
2006-03-26 09:38:26 +00:00
|
|
|
/*
|
|
|
|
|
* In case the user-specified fault handler returned
|
|
|
|
|
* zero, try to fix up.
|
|
|
|
|
*/
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2006-03-26 09:38:26 +00:00
|
|
|
entry = search_exception_tables(regs->tpc);
|
|
|
|
|
if (entry) {
|
|
|
|
|
regs->tpc = entry->fixup;
|
|
|
|
|
regs->tnpc = regs->tpc + 4;
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2006-03-26 09:38:26 +00:00
|
|
|
/*
|
|
|
|
|
* fixup_exception() could not handle it,
|
|
|
|
|
* Let do_page_fault() fix it.
|
|
|
|
|
*/
|
|
|
|
|
break;
|
|
|
|
|
default:
|
|
|
|
|
break;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
2006-03-26 09:38:26 +00:00
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Wrapper routine to for handling exceptions.
|
|
|
|
|
*/
|
2005-09-06 22:19:30 +00:00
|
|
|
int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
|
|
|
|
|
unsigned long val, void *data)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
|
struct die_args *args = (struct die_args *)data;
|
2005-11-07 09:00:07 +00:00
|
|
|
int ret = NOTIFY_DONE;
|
|
|
|
|
|
2006-03-26 09:38:21 +00:00
|
|
|
if (args->regs && user_mode(args->regs))
|
|
|
|
|
return ret;
|
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
switch (val) {
|
|
|
|
|
case DIE_DEBUG:
|
|
|
|
|
if (kprobe_handler(args->regs))
|
2005-11-07 09:00:07 +00:00
|
|
|
ret = NOTIFY_STOP;
|
2005-04-16 22:20:36 +00:00
|
|
|
break;
|
|
|
|
|
case DIE_DEBUG_2:
|
|
|
|
|
if (post_kprobe_handler(args->regs))
|
2005-11-07 09:00:07 +00:00
|
|
|
ret = NOTIFY_STOP;
|
2005-04-16 22:20:36 +00:00
|
|
|
break;
|
|
|
|
|
default:
|
|
|
|
|
break;
|
|
|
|
|
}
|
2005-11-07 09:00:07 +00:00
|
|
|
return ret;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
2005-09-06 22:19:30 +00:00
|
|
|
asmlinkage void __kprobes kprobe_trap(unsigned long trap_level,
|
|
|
|
|
struct pt_regs *regs)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
2013-09-14 12:02:11 +00:00
|
|
|
enum ctx_state prev_state = exception_enter();
|
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
BUG_ON(trap_level != 0x170 && trap_level != 0x171);
|
|
|
|
|
|
|
|
|
|
if (user_mode(regs)) {
|
|
|
|
|
local_irq_enable();
|
|
|
|
|
bad_trap(regs, trap_level);
|
2013-09-14 12:02:11 +00:00
|
|
|
goto out;
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* trap_level == 0x170 --> ta 0x70
|
|
|
|
|
* trap_level == 0x171 --> ta 0x71
|
|
|
|
|
*/
|
|
|
|
|
if (notify_die((trap_level == 0x170) ? DIE_DEBUG : DIE_DEBUG_2,
|
|
|
|
|
(trap_level == 0x170) ? "debug" : "debug_2",
|
|
|
|
|
regs, 0, trap_level, SIGTRAP) != NOTIFY_STOP)
|
|
|
|
|
bad_trap(regs, trap_level);
|
2013-09-14 12:02:11 +00:00
|
|
|
out:
|
|
|
|
|
exception_exit(prev_state);
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Jprobes support. */
|
2005-09-06 22:19:30 +00:00
|
|
|
int __kprobes setjmp_pre_handler(struct kprobe *p, struct pt_regs *regs)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
|
struct jprobe *jp = container_of(p, struct jprobe, kp);
|
2005-11-07 09:00:11 +00:00
|
|
|
struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2005-11-07 09:00:11 +00:00
|
|
|
memcpy(&(kcb->jprobe_saved_regs), regs, sizeof(*regs));
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
regs->tpc = (unsigned long) jp->entry;
|
|
|
|
|
regs->tnpc = ((unsigned long) jp->entry) + 0x4UL;
|
|
|
|
|
regs->tstate |= TSTATE_PIL;
|
|
|
|
|
|
|
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
|
2005-09-06 22:19:30 +00:00
|
|
|
void __kprobes jprobe_return(void)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
[SPARC64]: Fix several kprobes bugs.
- relbranch_fixup(), for non-branches, would end up setting
regs->tnpc incorrectly, in fact it would set it equal to
regs->tpc which would cause that instruction to execute twice
Also, if this is not a PC-relative branch, we should just
leave regs->tnpc as-is. This covers cases like 'jmpl' which
branch to absolute values.
- To be absolutely %100 safe, we need to flush the instruction
cache for all assignments to kprobe->ainsn.insn[], including
cases like add_aggr_kprobe()
- prev_kprobe's status field needs to be 'unsigned long' to match
the type of the value it is saving
- jprobes were totally broken:
= jprobe_return() can run in the stack frame of the jprobe handler,
or in an even deeper stack frame, thus we'll be in the wrong
register window than the one from the original probe state.
So unwind using 'restore' instructions, if necessary, right
before we do the jprobe_return() breakpoint trap.
= There is no reason to save/restore the register window saved
at %sp at jprobe trigger time. Those registers cannot be
modified by the jprobe handler. Also, this code was saving
and restoring "sizeof (struct sparc_stackf)" bytes. Depending
upon the caller, this could clobber unrelated stack frame
pieces if there is only a basic 128-byte register window
stored on the stack, without the argument save area.
So just saving and restoring struct pt_regs is sufficient.
= Kill the "jprobe_saved_esp", totally unused.
Also, delete "jprobe_saved_regs_location", with the stack frame
unwind now done explicitly by jprobe_return(), this check is
superfluous.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-10 10:42:03 +00:00
|
|
|
struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
|
|
|
|
|
register unsigned long orig_fp asm("g1");
|
|
|
|
|
|
|
|
|
|
orig_fp = kcb->jprobe_saved_regs.u_regs[UREG_FP];
|
|
|
|
|
__asm__ __volatile__("\n"
|
|
|
|
|
"1: cmp %%sp, %0\n\t"
|
|
|
|
|
"blu,a,pt %%xcc, 1b\n\t"
|
|
|
|
|
" restore\n\t"
|
|
|
|
|
".globl jprobe_return_trap_instruction\n"
|
2005-04-16 22:20:36 +00:00
|
|
|
"jprobe_return_trap_instruction:\n\t"
|
[SPARC64]: Fix several kprobes bugs.
- relbranch_fixup(), for non-branches, would end up setting
regs->tnpc incorrectly, in fact it would set it equal to
regs->tpc which would cause that instruction to execute twice
Also, if this is not a PC-relative branch, we should just
leave regs->tnpc as-is. This covers cases like 'jmpl' which
branch to absolute values.
- To be absolutely %100 safe, we need to flush the instruction
cache for all assignments to kprobe->ainsn.insn[], including
cases like add_aggr_kprobe()
- prev_kprobe's status field needs to be 'unsigned long' to match
the type of the value it is saving
- jprobes were totally broken:
= jprobe_return() can run in the stack frame of the jprobe handler,
or in an even deeper stack frame, thus we'll be in the wrong
register window than the one from the original probe state.
So unwind using 'restore' instructions, if necessary, right
before we do the jprobe_return() breakpoint trap.
= There is no reason to save/restore the register window saved
at %sp at jprobe trigger time. Those registers cannot be
modified by the jprobe handler. Also, this code was saving
and restoring "sizeof (struct sparc_stackf)" bytes. Depending
upon the caller, this could clobber unrelated stack frame
pieces if there is only a basic 128-byte register window
stored on the stack, without the argument save area.
So just saving and restoring struct pt_regs is sufficient.
= Kill the "jprobe_saved_esp", totally unused.
Also, delete "jprobe_saved_regs_location", with the stack frame
unwind now done explicitly by jprobe_return(), this check is
superfluous.
Signed-off-by: David S. Miller <davem@davemloft.net>
2006-12-10 10:42:03 +00:00
|
|
|
"ta 0x70"
|
|
|
|
|
: /* no outputs */
|
|
|
|
|
: "r" (orig_fp));
|
2005-04-16 22:20:36 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
extern void jprobe_return_trap_instruction(void);
|
|
|
|
|
|
2005-09-06 22:19:30 +00:00
|
|
|
int __kprobes longjmp_break_handler(struct kprobe *p, struct pt_regs *regs)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
|
u32 *addr = (u32 *) regs->tpc;
|
2005-11-07 09:00:11 +00:00
|
|
|
struct kprobe_ctlblk *kcb = get_kprobe_ctlblk();
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
|
if (addr == (u32 *) jprobe_return_trap_instruction) {
|
2005-11-07 09:00:11 +00:00
|
|
|
memcpy(regs, &(kcb->jprobe_saved_regs), sizeof(*regs));
|
2005-11-07 09:00:14 +00:00
|
|
|
preempt_enable_no_resched();
|
2005-04-16 22:20:36 +00:00
|
|
|
return 1;
|
|
|
|
|
}
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
2005-06-23 07:09:39 +00:00
|
|
|
|
2008-07-25 08:46:04 +00:00
|
|
|
/* The value stored in the return address register is actually 2
|
|
|
|
|
* instructions before where the callee will return to.
|
|
|
|
|
* Sequences usually look something like this
|
2008-02-09 11:40:55 +00:00
|
|
|
*
|
|
|
|
|
* call some_function <--- return register points here
|
|
|
|
|
* nop <--- call delay slot
|
|
|
|
|
* whatever <--- where callee returns to
|
|
|
|
|
*
|
|
|
|
|
* To keep trampoline_probe_handler logic simpler, we normalize the
|
|
|
|
|
* value kept in ri->ret_addr so we don't need to keep adjusting it
|
|
|
|
|
* back and forth.
|
|
|
|
|
*/
|
|
|
|
|
void __kprobes arch_prepare_kretprobe(struct kretprobe_instance *ri,
|
|
|
|
|
struct pt_regs *regs)
|
|
|
|
|
{
|
|
|
|
|
ri->ret_addr = (kprobe_opcode_t *)(regs->u_regs[UREG_RETPC] + 8);
|
|
|
|
|
|
|
|
|
|
/* Replace the return addr with trampoline addr */
|
|
|
|
|
regs->u_regs[UREG_RETPC] =
|
|
|
|
|
((unsigned long)kretprobe_trampoline) - 8;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Called when the probe at kretprobe trampoline is hit
|
|
|
|
|
*/
|
2014-05-16 21:26:03 +00:00
|
|
|
static int __kprobes trampoline_probe_handler(struct kprobe *p,
|
|
|
|
|
struct pt_regs *regs)
|
2008-02-09 11:40:55 +00:00
|
|
|
{
|
|
|
|
|
struct kretprobe_instance *ri = NULL;
|
|
|
|
|
struct hlist_head *head, empty_rp;
|
hlist: drop the node parameter from iterators
I'm not sure why, but the hlist for each entry iterators were conceived
list_for_each_entry(pos, head, member)
The hlist ones were greedy and wanted an extra parameter:
hlist_for_each_entry(tpos, pos, head, member)
Why did they need an extra pos parameter? I'm not quite sure. Not only
they don't really need it, it also prevents the iterator from looking
exactly like the list iterator, which is unfortunate.
Besides the semantic patch, there was some manual work required:
- Fix up the actual hlist iterators in linux/list.h
- Fix up the declaration of other iterators based on the hlist ones.
- A very small amount of places were using the 'node' parameter, this
was modified to use 'obj->member' instead.
- Coccinelle didn't handle the hlist_for_each_entry_safe iterator
properly, so those had to be fixed up manually.
The semantic patch which is mostly the work of Peter Senna Tschudin is here:
@@
iterator name hlist_for_each_entry, hlist_for_each_entry_continue, hlist_for_each_entry_from, hlist_for_each_entry_rcu, hlist_for_each_entry_rcu_bh, hlist_for_each_entry_continue_rcu_bh, for_each_busy_worker, ax25_uid_for_each, ax25_for_each, inet_bind_bucket_for_each, sctp_for_each_hentry, sk_for_each, sk_for_each_rcu, sk_for_each_from, sk_for_each_safe, sk_for_each_bound, hlist_for_each_entry_safe, hlist_for_each_entry_continue_rcu, nr_neigh_for_each, nr_neigh_for_each_safe, nr_node_for_each, nr_node_for_each_safe, for_each_gfn_indirect_valid_sp, for_each_gfn_sp, for_each_host;
type T;
expression a,c,d,e;
identifier b;
statement S;
@@
-T b;
<+... when != b
(
hlist_for_each_entry(a,
- b,
c, d) S
|
hlist_for_each_entry_continue(a,
- b,
c) S
|
hlist_for_each_entry_from(a,
- b,
c) S
|
hlist_for_each_entry_rcu(a,
- b,
c, d) S
|
hlist_for_each_entry_rcu_bh(a,
- b,
c, d) S
|
hlist_for_each_entry_continue_rcu_bh(a,
- b,
c) S
|
for_each_busy_worker(a, c,
- b,
d) S
|
ax25_uid_for_each(a,
- b,
c) S
|
ax25_for_each(a,
- b,
c) S
|
inet_bind_bucket_for_each(a,
- b,
c) S
|
sctp_for_each_hentry(a,
- b,
c) S
|
sk_for_each(a,
- b,
c) S
|
sk_for_each_rcu(a,
- b,
c) S
|
sk_for_each_from
-(a, b)
+(a)
S
+ sk_for_each_from(a) S
|
sk_for_each_safe(a,
- b,
c, d) S
|
sk_for_each_bound(a,
- b,
c) S
|
hlist_for_each_entry_safe(a,
- b,
c, d, e) S
|
hlist_for_each_entry_continue_rcu(a,
- b,
c) S
|
nr_neigh_for_each(a,
- b,
c) S
|
nr_neigh_for_each_safe(a,
- b,
c, d) S
|
nr_node_for_each(a,
- b,
c) S
|
nr_node_for_each_safe(a,
- b,
c, d) S
|
- for_each_gfn_sp(a, c, d, b) S
+ for_each_gfn_sp(a, c, d) S
|
- for_each_gfn_indirect_valid_sp(a, c, d, b) S
+ for_each_gfn_indirect_valid_sp(a, c, d) S
|
for_each_host(a,
- b,
c) S
|
for_each_host_safe(a,
- b,
c, d) S
|
for_each_mesh_entry(a,
- b,
c, d) S
)
...+>
[akpm@linux-foundation.org: drop bogus change from net/ipv4/raw.c]
[akpm@linux-foundation.org: drop bogus hunk from net/ipv6/raw.c]
[akpm@linux-foundation.org: checkpatch fixes]
[akpm@linux-foundation.org: fix warnings]
[akpm@linux-foudnation.org: redo intrusive kvm changes]
Tested-by: Peter Senna Tschudin <peter.senna@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-28 01:06:00 +00:00
|
|
|
struct hlist_node *tmp;
|
2008-02-09 11:40:55 +00:00
|
|
|
unsigned long flags, orig_ret_address = 0;
|
|
|
|
|
unsigned long trampoline_address =(unsigned long)&kretprobe_trampoline;
|
|
|
|
|
|
|
|
|
|
INIT_HLIST_HEAD(&empty_rp);
|
2008-07-25 08:46:04 +00:00
|
|
|
kretprobe_hash_lock(current, &head, &flags);
|
2008-02-09 11:40:55 +00:00
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* It is possible to have multiple instances associated with a given
|
|
|
|
|
* task either because an multiple functions in the call path
|
2008-10-16 17:02:37 +00:00
|
|
|
* have a return probe installed on them, and/or more than one return
|
2008-02-09 11:40:55 +00:00
|
|
|
* return probe was registered for a target function.
|
|
|
|
|
*
|
|
|
|
|
* We can handle this because:
|
|
|
|
|
* - instances are always inserted at the head of the list
|
|
|
|
|
* - when multiple return probes are registered for the same
|
|
|
|
|
* function, the first instance's ret_addr will point to the
|
|
|
|
|
* real return address, and all the rest will point to
|
|
|
|
|
* kretprobe_trampoline
|
|
|
|
|
*/
|
hlist: drop the node parameter from iterators
I'm not sure why, but the hlist for each entry iterators were conceived
list_for_each_entry(pos, head, member)
The hlist ones were greedy and wanted an extra parameter:
hlist_for_each_entry(tpos, pos, head, member)
Why did they need an extra pos parameter? I'm not quite sure. Not only
they don't really need it, it also prevents the iterator from looking
exactly like the list iterator, which is unfortunate.
Besides the semantic patch, there was some manual work required:
- Fix up the actual hlist iterators in linux/list.h
- Fix up the declaration of other iterators based on the hlist ones.
- A very small amount of places were using the 'node' parameter, this
was modified to use 'obj->member' instead.
- Coccinelle didn't handle the hlist_for_each_entry_safe iterator
properly, so those had to be fixed up manually.
The semantic patch which is mostly the work of Peter Senna Tschudin is here:
@@
iterator name hlist_for_each_entry, hlist_for_each_entry_continue, hlist_for_each_entry_from, hlist_for_each_entry_rcu, hlist_for_each_entry_rcu_bh, hlist_for_each_entry_continue_rcu_bh, for_each_busy_worker, ax25_uid_for_each, ax25_for_each, inet_bind_bucket_for_each, sctp_for_each_hentry, sk_for_each, sk_for_each_rcu, sk_for_each_from, sk_for_each_safe, sk_for_each_bound, hlist_for_each_entry_safe, hlist_for_each_entry_continue_rcu, nr_neigh_for_each, nr_neigh_for_each_safe, nr_node_for_each, nr_node_for_each_safe, for_each_gfn_indirect_valid_sp, for_each_gfn_sp, for_each_host;
type T;
expression a,c,d,e;
identifier b;
statement S;
@@
-T b;
<+... when != b
(
hlist_for_each_entry(a,
- b,
c, d) S
|
hlist_for_each_entry_continue(a,
- b,
c) S
|
hlist_for_each_entry_from(a,
- b,
c) S
|
hlist_for_each_entry_rcu(a,
- b,
c, d) S
|
hlist_for_each_entry_rcu_bh(a,
- b,
c, d) S
|
hlist_for_each_entry_continue_rcu_bh(a,
- b,
c) S
|
for_each_busy_worker(a, c,
- b,
d) S
|
ax25_uid_for_each(a,
- b,
c) S
|
ax25_for_each(a,
- b,
c) S
|
inet_bind_bucket_for_each(a,
- b,
c) S
|
sctp_for_each_hentry(a,
- b,
c) S
|
sk_for_each(a,
- b,
c) S
|
sk_for_each_rcu(a,
- b,
c) S
|
sk_for_each_from
-(a, b)
+(a)
S
+ sk_for_each_from(a) S
|
sk_for_each_safe(a,
- b,
c, d) S
|
sk_for_each_bound(a,
- b,
c) S
|
hlist_for_each_entry_safe(a,
- b,
c, d, e) S
|
hlist_for_each_entry_continue_rcu(a,
- b,
c) S
|
nr_neigh_for_each(a,
- b,
c) S
|
nr_neigh_for_each_safe(a,
- b,
c, d) S
|
nr_node_for_each(a,
- b,
c) S
|
nr_node_for_each_safe(a,
- b,
c, d) S
|
- for_each_gfn_sp(a, c, d, b) S
+ for_each_gfn_sp(a, c, d) S
|
- for_each_gfn_indirect_valid_sp(a, c, d, b) S
+ for_each_gfn_indirect_valid_sp(a, c, d) S
|
for_each_host(a,
- b,
c) S
|
for_each_host_safe(a,
- b,
c, d) S
|
for_each_mesh_entry(a,
- b,
c, d) S
)
...+>
[akpm@linux-foundation.org: drop bogus change from net/ipv4/raw.c]
[akpm@linux-foundation.org: drop bogus hunk from net/ipv6/raw.c]
[akpm@linux-foundation.org: checkpatch fixes]
[akpm@linux-foundation.org: fix warnings]
[akpm@linux-foudnation.org: redo intrusive kvm changes]
Tested-by: Peter Senna Tschudin <peter.senna@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-28 01:06:00 +00:00
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hlist_for_each_entry_safe(ri, tmp, head, hlist) {
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2008-02-09 11:40:55 +00:00
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if (ri->task != current)
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/* another task is sharing our hash bucket */
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continue;
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if (ri->rp && ri->rp->handler)
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ri->rp->handler(ri, regs);
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orig_ret_address = (unsigned long)ri->ret_addr;
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recycle_rp_inst(ri, &empty_rp);
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if (orig_ret_address != trampoline_address)
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/*
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* This is the real return address. Any other
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* instances associated with this task are for
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* other calls deeper on the call stack
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*/
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break;
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}
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kretprobe_assert(ri, orig_ret_address, trampoline_address);
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regs->tpc = orig_ret_address;
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regs->tnpc = orig_ret_address + 4;
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reset_current_kprobe();
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2008-07-25 08:46:04 +00:00
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kretprobe_hash_unlock(current, &flags);
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2008-02-09 11:40:55 +00:00
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preempt_enable_no_resched();
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hlist: drop the node parameter from iterators
I'm not sure why, but the hlist for each entry iterators were conceived
list_for_each_entry(pos, head, member)
The hlist ones were greedy and wanted an extra parameter:
hlist_for_each_entry(tpos, pos, head, member)
Why did they need an extra pos parameter? I'm not quite sure. Not only
they don't really need it, it also prevents the iterator from looking
exactly like the list iterator, which is unfortunate.
Besides the semantic patch, there was some manual work required:
- Fix up the actual hlist iterators in linux/list.h
- Fix up the declaration of other iterators based on the hlist ones.
- A very small amount of places were using the 'node' parameter, this
was modified to use 'obj->member' instead.
- Coccinelle didn't handle the hlist_for_each_entry_safe iterator
properly, so those had to be fixed up manually.
The semantic patch which is mostly the work of Peter Senna Tschudin is here:
@@
iterator name hlist_for_each_entry, hlist_for_each_entry_continue, hlist_for_each_entry_from, hlist_for_each_entry_rcu, hlist_for_each_entry_rcu_bh, hlist_for_each_entry_continue_rcu_bh, for_each_busy_worker, ax25_uid_for_each, ax25_for_each, inet_bind_bucket_for_each, sctp_for_each_hentry, sk_for_each, sk_for_each_rcu, sk_for_each_from, sk_for_each_safe, sk_for_each_bound, hlist_for_each_entry_safe, hlist_for_each_entry_continue_rcu, nr_neigh_for_each, nr_neigh_for_each_safe, nr_node_for_each, nr_node_for_each_safe, for_each_gfn_indirect_valid_sp, for_each_gfn_sp, for_each_host;
type T;
expression a,c,d,e;
identifier b;
statement S;
@@
-T b;
<+... when != b
(
hlist_for_each_entry(a,
- b,
c, d) S
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hlist_for_each_entry_continue(a,
- b,
c) S
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hlist_for_each_entry_from(a,
- b,
c) S
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hlist_for_each_entry_rcu(a,
- b,
c, d) S
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hlist_for_each_entry_rcu_bh(a,
- b,
c, d) S
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hlist_for_each_entry_continue_rcu_bh(a,
- b,
c) S
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for_each_busy_worker(a, c,
- b,
d) S
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ax25_uid_for_each(a,
- b,
c) S
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ax25_for_each(a,
- b,
c) S
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inet_bind_bucket_for_each(a,
- b,
c) S
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sctp_for_each_hentry(a,
- b,
c) S
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sk_for_each(a,
- b,
c) S
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sk_for_each_rcu(a,
- b,
c) S
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sk_for_each_from
-(a, b)
+(a)
S
+ sk_for_each_from(a) S
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sk_for_each_safe(a,
- b,
c, d) S
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sk_for_each_bound(a,
- b,
c) S
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hlist_for_each_entry_safe(a,
- b,
c, d, e) S
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hlist_for_each_entry_continue_rcu(a,
- b,
c) S
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nr_neigh_for_each(a,
- b,
c) S
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nr_neigh_for_each_safe(a,
- b,
c, d) S
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nr_node_for_each(a,
- b,
c) S
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nr_node_for_each_safe(a,
- b,
c, d) S
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- for_each_gfn_sp(a, c, d, b) S
+ for_each_gfn_sp(a, c, d) S
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- for_each_gfn_indirect_valid_sp(a, c, d, b) S
+ for_each_gfn_indirect_valid_sp(a, c, d) S
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for_each_host(a,
- b,
c) S
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for_each_host_safe(a,
- b,
c, d) S
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for_each_mesh_entry(a,
- b,
c, d) S
)
...+>
[akpm@linux-foundation.org: drop bogus change from net/ipv4/raw.c]
[akpm@linux-foundation.org: drop bogus hunk from net/ipv6/raw.c]
[akpm@linux-foundation.org: checkpatch fixes]
[akpm@linux-foundation.org: fix warnings]
[akpm@linux-foudnation.org: redo intrusive kvm changes]
Tested-by: Peter Senna Tschudin <peter.senna@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2013-02-28 01:06:00 +00:00
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hlist_for_each_entry_safe(ri, tmp, &empty_rp, hlist) {
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2008-02-09 11:40:55 +00:00
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hlist_del(&ri->hlist);
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kfree(ri);
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}
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/*
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* By returning a non-zero value, we are telling
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* kprobe_handler() that we don't want the post_handler
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* to run (and have re-enabled preemption)
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*/
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return 1;
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}
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2014-05-16 21:26:03 +00:00
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static void __used kretprobe_trampoline_holder(void)
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2008-02-09 11:40:55 +00:00
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{
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asm volatile(".global kretprobe_trampoline\n"
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"kretprobe_trampoline:\n"
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"\tnop\n"
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"\tnop\n");
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}
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static struct kprobe trampoline_p = {
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.addr = (kprobe_opcode_t *) &kretprobe_trampoline,
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.pre_handler = trampoline_probe_handler
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};
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int __init arch_init_kprobes(void)
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2005-07-06 01:54:50 +00:00
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{
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2008-02-09 11:40:55 +00:00
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return register_kprobe(&trampoline_p);
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}
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int __kprobes arch_trampoline_kprobe(struct kprobe *p)
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{
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if (p->addr == (kprobe_opcode_t *)&kretprobe_trampoline)
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return 1;
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2005-07-06 01:54:50 +00:00
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return 0;
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}
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