Heiko Carstens c933146a5e s390/ftrace,kprobes: allow to patch first instruction ... If the function tracer is enabled, allow to set kprobes on the first instruction of a function (which is the function trace caller): If no kprobe is set handling of enabling and disabling function tracing of a function simply patches the first instruction. Either it is a nop (right now it's an unconditional branch, which skips the mcount block), or it's a branch to the ftrace_caller() function. If a kprobe is being placed on a function tracer calling instruction we encode if we actually have a nop or branch in the remaining bytes after the breakpoint instruction (illegal opcode). This is possible, since the size of the instruction used for the nop and branch is six bytes, while the size of the breakpoint is only two bytes. Therefore the first two bytes contain the illegal opcode and the last four bytes contain either "0" for nop or "1" for branch. The kprobes code will then execute/simulate the correct instruction. Instruction patching for kprobes and function tracer is always done with stop_machine(). Therefore we don't have any races where an instruction is patched concurrently on a different cpu. Besides that also the program check handler which executes the function trace caller instruction won't be executed concurrently to any stop_machine() execution. This allows to keep full fault based kprobes handling which generates correct pt_regs contents automatically. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>		2014-10-27 13:27:27 +01:00
..
basic	kernel: build bin2c based on config option CONFIG_BUILD_BIN2C	2014-08-08 15:57:32 -07:00
coccinelle	coccinelle: misc: semantic patch to delete overly complex return code processing	2014-09-26 13:42:31 +02:00
dtc	kbuild: trivial - remove trailing empty lines	2014-06-10 00:04:06 +02:00
genksyms	genksyms: fix typeof() handling	2014-04-03 16:20:52 -07:00
kconfig	Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild	2014-10-14 09:22:26 +02:00
ksymoops
mod	arm64 updates for 3.18:	2014-10-08 05:34:24 -04:00
package	Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild	2014-10-14 09:27:48 +02:00
rt-tester	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
selinux	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
tracing	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
.gitignore	bin2c: move bin2c in scripts/basic	2014-08-08 15:57:32 -07:00
analyze_suspend.py	PM / tools: analyze_suspend.py: update to v3.0	2014-08-09 02:47:58 +02:00
asn1_compiler.c	X.509: remove possible code fragility: enumeration values not handled	2013-09-25 17:17:01 +01:00
bloat-o-meter	bloat-o-meter: Ignore syscall aliases SyS_ and compat_SyS_	2014-08-23 13:08:48 -07:00
bootgraph.pl	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
checkincludes.pl
checkkconfigsymbols.sh	scripts/checkkconfigsymbols.sh: replace echo -e with printf	2013-08-28 17:00:47 +02:00
checkpatch.pl	checkpatch: warn on logging functions with KERN_<LEVEL>	2014-10-14 02:18:15 +02:00
checkstack.pl	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2014-10-07 21:16:26 -04:00
checksyscalls.sh	scripts/checksyscalls.sh: Make renameat optional	2014-05-20 10:59:38 +02:00
checkversion.pl
cleanfile
cleanpatch
coccicheck	Coccinelle: Update information about the minimal version required	2013-07-03 22:58:20 +02:00
config	kbuild: trivial - remove trailing empty lines	2014-06-10 00:04:06 +02:00
conmakehash.c	kbuild: trivial - remove trailing spaces	2014-04-30 17:34:32 +02:00
decode_stacktrace.sh	decode_stacktrace: make stack dump output useful again	2014-06-10 15:29:43 -07:00
decodecode	scripts/decodecode: make faulting insn ptr more robust	2013-04-29 15:54:27 -07:00
depmod.sh	depmod: pass -P $CONFIG_SYMBOL_PREFIX	2013-02-22 11:52:31 +01:00
diffconfig	diffconfig: Update script to support python versions 2.5 through 3.3	2013-09-01 21:24:51 +02:00
docproc.c	kbuild: trivial - use tabs for code indent where possible	2014-06-10 14:00:53 +02:00
export_report.pl	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
extract-ikconfig
extract-vmlinux
gcc-goto.sh	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
gcc-ld	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
gcc-version.sh	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
gcc-x86_32-has-stack-protector.sh	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
gcc-x86_64-has-stack-protector.sh	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
gen_initramfs_list.sh	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
get_maintainer.pl	scripts: Teach get_maintainer.pl about the new "R:" tag	2014-07-08 14:47:17 -07:00
gfp-translate
headerdep.pl
headers_check.pl	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
headers_install.sh	Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild	2014-10-14 09:22:26 +02:00
headers.sh	kbuild: trivial - remove trailing empty lines	2014-06-10 00:04:06 +02:00
kallsyms.c	aarch64: filter $x from kallsyms	2014-10-02 17:01:51 +01:00
Kbuild.include	kbuild: simplify build, clean, modbuiltin shorthands	2014-10-02 15:12:41 +02:00
kernel-doc	scripts/kernel-doc: recognize __meminit	2014-08-26 13:49:57 -07:00
ld-version.sh	Kbuild, lto: add ld-version and ld-ifversion macros	2014-02-13 20:25:00 -08:00
Lindent
link-vmlinux.sh	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
Makefile	bin2c: move bin2c in scripts/basic	2014-08-08 15:57:32 -07:00
Makefile.asm-generic	kbuild: trivial - remove trailing empty lines	2014-06-10 00:04:06 +02:00
Makefile.build	kbuild: remove obj-n and lib-n handling	2014-10-02 13:55:02 +02:00
Makefile.clean	kbuild: simplify build, clean, modbuiltin shorthands	2014-10-02 15:12:41 +02:00
Makefile.extrawarn	kbuild, LLVMLinux: Supress warnings unless W=1-3	2014-08-05 15:40:01 +02:00
Makefile.fwinst	kbuild: remove obj-n and lib-n handling	2014-10-02 13:55:02 +02:00
Makefile.headersinst	kbuild: fix make headers_install when path is too long	2013-05-17 22:10:35 +02:00
Makefile.help
Makefile.host	kbuild: handle the dependency of multi-objs hostprogs appropriately	2014-08-19 10:26:20 +02:00
Makefile.lib	kbuild: handle multi-objs dependency appropriately	2014-08-19 10:26:19 +02:00
Makefile.modbuiltin
Makefile.modinst	kbuild: handle module compression while running 'make modules_install'.	2014-08-27 21:54:12 +09:30
Makefile.modpost	modpost: Optionally ignore secondary errors seen if a single module build fails	2013-09-23 15:45:03 +09:30
Makefile.modsign	modsign: lookup lines ending in .ko in .mod files	2014-08-27 21:54:11 +09:30
makelst
markup_oops.pl	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
mkcompile_h	kbuild: trivial - remove trailing spaces	2014-04-30 17:34:32 +02:00
mkmakefile	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
mksysmap	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
mkuboot.sh
mkversion
module-common.lds
namespace.pl
objdiff	scripts: objdiff: support directories for the augument of record command	2014-06-10 14:59:33 +02:00
patch-kernel	kbuild: trivial - remove trailing spaces	2014-04-30 17:34:32 +02:00
pnmtologo.c	kbuild: trivial - remove trailing empty lines	2014-06-10 00:04:06 +02:00
profile2linkerlist.pl	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00
recordmcount.c	s390/ftrace,kprobes: allow to patch first instruction	2014-10-27 13:27:27 +01:00
recordmcount.h	recordmcount/MIPS: Fix possible incorrect mcount_loc table entries in modules	2014-06-26 10:48:19 +01:00
recordmcount.pl	s390/ftrace,kprobes: allow to patch first instruction	2014-10-27 13:27:27 +01:00
setlocalversion	Fix detectition of kernel git repository in setlocalversion script [take #2]	2014-01-03 14:48:42 +01:00
show_delta	kbuild: trivial - remove trailing empty lines	2014-06-10 00:04:06 +02:00
sign-file	treewide: fix errors in printk	2014-09-01 11:18:25 +02:00
sortextable.c	xtensa: enable sorting extable at build time	2014-04-02 01:35:50 +04:00
sortextable.h	scripts/sortextable: suppress warning: `relocs_size' may be used uninitialized	2014-10-14 02:18:23 +02:00
spelling.txt	checkpatch: look for common misspellings	2014-10-14 02:18:15 +02:00
tags.sh	Merge branch 'misc' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild	2014-10-14 09:27:48 +02:00
unifdef.c
ver_linux
xz_wrap.sh	kbuild: Make scripts executable	2014-08-20 16:03:45 +02:00