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linux/arch/sparc/kernel/traps_32.c
Greg Kroah-Hartman b24413180f 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>
2017-11-02 11:10:55 +01:00

461 lines
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// SPDX-License-Identifier: GPL-2.0
/*
* arch/sparc/kernel/traps.c
*
* Copyright 1995, 2008 David S. Miller (davem@davemloft.net)
* Copyright 2000 Jakub Jelinek (jakub@redhat.com)
*/
/*
* I hate traps on the sparc, grrr...
*/
#include <linux/sched/mm.h>
#include <linux/sched/debug.h>
#include <linux/mm_types.h>
#include <linux/kernel.h>
#include <linux/signal.h>
#include <linux/smp.h>
#include <linux/kdebug.h>
#include <linux/export.h>
#include <asm/delay.h>
#include <asm/ptrace.h>
#include <asm/oplib.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/unistd.h>
#include <asm/traps.h>
#include "entry.h"
#include "kernel.h"
/* #define TRAP_DEBUG */
static void instruction_dump(unsigned long *pc)
{
int i;
if((((unsigned long) pc) & 3))
return;
for(i = -3; i < 6; i++)
printk("%c%08lx%c",i?' ':'<',pc[i],i?' ':'>');
printk("\n");
}
#define __SAVE __asm__ __volatile__("save %sp, -0x40, %sp\n\t")
#define __RESTORE __asm__ __volatile__("restore %g0, %g0, %g0\n\t")
void __noreturn die_if_kernel(char *str, struct pt_regs *regs)
{
static int die_counter;
int count = 0;
/* Amuse the user. */
printk(
" \\|/ ____ \\|/\n"
" \"@'/ ,. \\`@\"\n"
" /_| \\__/ |_\\\n"
" \\__U_/\n");
printk("%s(%d): %s [#%d]\n", current->comm, task_pid_nr(current), str, ++die_counter);
show_regs(regs);
add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
__SAVE; __SAVE; __SAVE; __SAVE;
__SAVE; __SAVE; __SAVE; __SAVE;
__RESTORE; __RESTORE; __RESTORE; __RESTORE;
__RESTORE; __RESTORE; __RESTORE; __RESTORE;
{
struct reg_window32 *rw = (struct reg_window32 *)regs->u_regs[UREG_FP];
/* Stop the back trace when we hit userland or we
* find some badly aligned kernel stack. Set an upper
* bound in case our stack is trashed and we loop.
*/
while(rw &&
count++ < 30 &&
(((unsigned long) rw) >= PAGE_OFFSET) &&
!(((unsigned long) rw) & 0x7)) {
printk("Caller[%08lx]: %pS\n", rw->ins[7],
(void *) rw->ins[7]);
rw = (struct reg_window32 *)rw->ins[6];
}
}
printk("Instruction DUMP:");
instruction_dump ((unsigned long *) regs->pc);
if(regs->psr & PSR_PS)
do_exit(SIGKILL);
do_exit(SIGSEGV);
}
void do_hw_interrupt(struct pt_regs *regs, unsigned long type)
{
siginfo_t info;
if(type < 0x80) {
/* Sun OS's puke from bad traps, Linux survives! */
printk("Unimplemented Sparc TRAP, type = %02lx\n", type);
die_if_kernel("Whee... Hello Mr. Penguin", regs);
}
if(regs->psr & PSR_PS)
die_if_kernel("Kernel bad trap", regs);
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_ILLTRP;
info.si_addr = (void __user *)regs->pc;
info.si_trapno = type - 0x80;
force_sig_info(SIGILL, &info, current);
}
void do_illegal_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
siginfo_t info;
if(psr & PSR_PS)
die_if_kernel("Kernel illegal instruction", regs);
#ifdef TRAP_DEBUG
printk("Ill instr. at pc=%08lx instruction is %08lx\n",
regs->pc, *(unsigned long *)regs->pc);
#endif
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_ILLOPC;
info.si_addr = (void __user *)pc;
info.si_trapno = 0;
send_sig_info(SIGILL, &info, current);
}
void do_priv_instruction(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
siginfo_t info;
if(psr & PSR_PS)
die_if_kernel("Penguin instruction from Penguin mode??!?!", regs);
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_PRVOPC;
info.si_addr = (void __user *)pc;
info.si_trapno = 0;
send_sig_info(SIGILL, &info, current);
}
/* XXX User may want to be allowed to do this. XXX */
void do_memaccess_unaligned(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
siginfo_t info;
if(regs->psr & PSR_PS) {
printk("KERNEL MNA at pc %08lx npc %08lx called by %08lx\n", pc, npc,
regs->u_regs[UREG_RETPC]);
die_if_kernel("BOGUS", regs);
/* die_if_kernel("Kernel MNA access", regs); */
}
#if 0
show_regs (regs);
instruction_dump ((unsigned long *) regs->pc);
printk ("do_MNA!\n");
#endif
info.si_signo = SIGBUS;
info.si_errno = 0;
info.si_code = BUS_ADRALN;
info.si_addr = /* FIXME: Should dig out mna address */ (void *)0;
info.si_trapno = 0;
send_sig_info(SIGBUS, &info, current);
}
static unsigned long init_fsr = 0x0UL;
static unsigned long init_fregs[32] __attribute__ ((aligned (8))) =
{ ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL,
~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL, ~0UL };
void do_fpd_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
/* Sanity check... */
if(psr & PSR_PS)
die_if_kernel("Kernel gets FloatingPenguinUnit disabled trap", regs);
put_psr(get_psr() | PSR_EF); /* Allow FPU ops. */
regs->psr |= PSR_EF;
#ifndef CONFIG_SMP
if(last_task_used_math == current)
return;
if(last_task_used_math) {
/* Other processes fpu state, save away */
struct task_struct *fptask = last_task_used_math;
fpsave(&fptask->thread.float_regs[0], &fptask->thread.fsr,
&fptask->thread.fpqueue[0], &fptask->thread.fpqdepth);
}
last_task_used_math = current;
if(used_math()) {
fpload(&current->thread.float_regs[0], &current->thread.fsr);
} else {
/* Set initial sane state. */
fpload(&init_fregs[0], &init_fsr);
set_used_math();
}
#else
if(!used_math()) {
fpload(&init_fregs[0], &init_fsr);
set_used_math();
} else {
fpload(&current->thread.float_regs[0], &current->thread.fsr);
}
set_thread_flag(TIF_USEDFPU);
#endif
}
static unsigned long fake_regs[32] __attribute__ ((aligned (8)));
static unsigned long fake_fsr;
static unsigned long fake_queue[32] __attribute__ ((aligned (8)));
static unsigned long fake_depth;
void do_fpe_trap(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
static int calls;
siginfo_t info;
unsigned long fsr;
int ret = 0;
#ifndef CONFIG_SMP
struct task_struct *fpt = last_task_used_math;
#else
struct task_struct *fpt = current;
#endif
put_psr(get_psr() | PSR_EF);
/* If nobody owns the fpu right now, just clear the
* error into our fake static buffer and hope it don't
* happen again. Thank you crashme...
*/
#ifndef CONFIG_SMP
if(!fpt) {
#else
if (!test_tsk_thread_flag(fpt, TIF_USEDFPU)) {
#endif
fpsave(&fake_regs[0], &fake_fsr, &fake_queue[0], &fake_depth);
regs->psr &= ~PSR_EF;
return;
}
fpsave(&fpt->thread.float_regs[0], &fpt->thread.fsr,
&fpt->thread.fpqueue[0], &fpt->thread.fpqdepth);
#ifdef DEBUG_FPU
printk("Hmm, FP exception, fsr was %016lx\n", fpt->thread.fsr);
#endif
switch ((fpt->thread.fsr & 0x1c000)) {
/* switch on the contents of the ftt [floating point trap type] field */
#ifdef DEBUG_FPU
case (1 << 14):
printk("IEEE_754_exception\n");
break;
#endif
case (2 << 14): /* unfinished_FPop (underflow & co) */
case (3 << 14): /* unimplemented_FPop (quad stuff, maybe sqrt) */
ret = do_mathemu(regs, fpt);
break;
#ifdef DEBUG_FPU
case (4 << 14):
printk("sequence_error (OS bug...)\n");
break;
case (5 << 14):
printk("hardware_error (uhoh!)\n");
break;
case (6 << 14):
printk("invalid_fp_register (user error)\n");
break;
#endif /* DEBUG_FPU */
}
/* If we successfully emulated the FPop, we pretend the trap never happened :-> */
if (ret) {
fpload(&current->thread.float_regs[0], &current->thread.fsr);
return;
}
/* nope, better SIGFPE the offending process... */
#ifdef CONFIG_SMP
clear_tsk_thread_flag(fpt, TIF_USEDFPU);
#endif
if(psr & PSR_PS) {
/* The first fsr store/load we tried trapped,
* the second one will not (we hope).
*/
printk("WARNING: FPU exception from kernel mode. at pc=%08lx\n",
regs->pc);
regs->pc = regs->npc;
regs->npc += 4;
calls++;
if(calls > 2)
die_if_kernel("Too many Penguin-FPU traps from kernel mode",
regs);
return;
}
fsr = fpt->thread.fsr;
info.si_signo = SIGFPE;
info.si_errno = 0;
info.si_addr = (void __user *)pc;
info.si_trapno = 0;
info.si_code = FPE_FIXME;
if ((fsr & 0x1c000) == (1 << 14)) {
if (fsr & 0x10)
info.si_code = FPE_FLTINV;
else if (fsr & 0x08)
info.si_code = FPE_FLTOVF;
else if (fsr & 0x04)
info.si_code = FPE_FLTUND;
else if (fsr & 0x02)
info.si_code = FPE_FLTDIV;
else if (fsr & 0x01)
info.si_code = FPE_FLTRES;
}
send_sig_info(SIGFPE, &info, fpt);
#ifndef CONFIG_SMP
last_task_used_math = NULL;
#endif
regs->psr &= ~PSR_EF;
if(calls > 0)
calls=0;
}
void handle_tag_overflow(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
siginfo_t info;
if(psr & PSR_PS)
die_if_kernel("Penguin overflow trap from kernel mode", regs);
info.si_signo = SIGEMT;
info.si_errno = 0;
info.si_code = EMT_TAGOVF;
info.si_addr = (void __user *)pc;
info.si_trapno = 0;
send_sig_info(SIGEMT, &info, current);
}
void handle_watchpoint(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
#ifdef TRAP_DEBUG
printk("Watchpoint detected at PC %08lx NPC %08lx PSR %08lx\n",
pc, npc, psr);
#endif
if(psr & PSR_PS)
panic("Tell me what a watchpoint trap is, and I'll then deal "
"with such a beast...");
}
void handle_reg_access(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
siginfo_t info;
#ifdef TRAP_DEBUG
printk("Register Access Exception at PC %08lx NPC %08lx PSR %08lx\n",
pc, npc, psr);
#endif
info.si_signo = SIGBUS;
info.si_errno = 0;
info.si_code = BUS_OBJERR;
info.si_addr = (void __user *)pc;
info.si_trapno = 0;
force_sig_info(SIGBUS, &info, current);
}
void handle_cp_disabled(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
siginfo_t info;
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_COPROC;
info.si_addr = (void __user *)pc;
info.si_trapno = 0;
send_sig_info(SIGILL, &info, current);
}
void handle_cp_exception(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
siginfo_t info;
#ifdef TRAP_DEBUG
printk("Co-Processor Exception at PC %08lx NPC %08lx PSR %08lx\n",
pc, npc, psr);
#endif
info.si_signo = SIGILL;
info.si_errno = 0;
info.si_code = ILL_COPROC;
info.si_addr = (void __user *)pc;
info.si_trapno = 0;
send_sig_info(SIGILL, &info, current);
}
void handle_hw_divzero(struct pt_regs *regs, unsigned long pc, unsigned long npc,
unsigned long psr)
{
siginfo_t info;
info.si_signo = SIGFPE;
info.si_errno = 0;
info.si_code = FPE_INTDIV;
info.si_addr = (void __user *)pc;
info.si_trapno = 0;
send_sig_info(SIGFPE, &info, current);
}
#ifdef CONFIG_DEBUG_BUGVERBOSE
void do_BUG(const char *file, int line)
{
// bust_spinlocks(1); XXX Not in our original BUG()
printk("kernel BUG at %s:%d!\n", file, line);
}
EXPORT_SYMBOL(do_BUG);
#endif
/* Since we have our mappings set up, on multiprocessors we can spin them
* up here so that timer interrupts work during initialization.
*/
void trap_init(void)
{
extern void thread_info_offsets_are_bolixed_pete(void);
/* Force linker to barf if mismatched */
if (TI_UWINMASK != offsetof(struct thread_info, uwinmask) ||
TI_TASK != offsetof(struct thread_info, task) ||
TI_FLAGS != offsetof(struct thread_info, flags) ||
TI_CPU != offsetof(struct thread_info, cpu) ||
TI_PREEMPT != offsetof(struct thread_info, preempt_count) ||
TI_SOFTIRQ != offsetof(struct thread_info, softirq_count) ||
TI_HARDIRQ != offsetof(struct thread_info, hardirq_count) ||
TI_KSP != offsetof(struct thread_info, ksp) ||
TI_KPC != offsetof(struct thread_info, kpc) ||
TI_KPSR != offsetof(struct thread_info, kpsr) ||
TI_KWIM != offsetof(struct thread_info, kwim) ||
TI_REG_WINDOW != offsetof(struct thread_info, reg_window) ||
TI_RWIN_SPTRS != offsetof(struct thread_info, rwbuf_stkptrs) ||
TI_W_SAVED != offsetof(struct thread_info, w_saved))
thread_info_offsets_are_bolixed_pete();
/* Attach to the address space of init_task. */
mmgrab(&init_mm);
current->active_mm = &init_mm;
/* NOTE: Other cpus have this done as they are started
* up on SMP.
*/
}
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