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linux/arch/parisc/kernel/traps.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

872 lines
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// SPDX-License-Identifier: GPL-2.0
/*
* linux/arch/parisc/traps.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
* Copyright (C) 1999, 2000 Philipp Rumpf <prumpf@tux.org>
*/
/*
* 'Traps.c' handles hardware traps and faults after we have saved some
* state in 'asm.s'.
*/
#include <linux/sched.h>
#include <linux/sched/debug.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/smp.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/console.h>
#include <linux/bug.h>
#include <linux/ratelimit.h>
#include <linux/uaccess.h>
#include <asm/assembly.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/unaligned.h>
#include <linux/atomic.h>
#include <asm/smp.h>
#include <asm/pdc.h>
#include <asm/pdc_chassis.h>
#include <asm/unwind.h>
#include <asm/tlbflush.h>
#include <asm/cacheflush.h>
#include "../math-emu/math-emu.h" /* for handle_fpe() */
static void parisc_show_stack(struct task_struct *task, unsigned long *sp,
struct pt_regs *regs);
static int printbinary(char *buf, unsigned long x, int nbits)
{
unsigned long mask = 1UL << (nbits - 1);
while (mask != 0) {
*buf++ = (mask & x ? '1' : '0');
mask >>= 1;
}
*buf = '\0';
return nbits;
}
#ifdef CONFIG_64BIT
#define RFMT "%016lx"
#else
#define RFMT "%08lx"
#endif
#define FFMT "%016llx" /* fpregs are 64-bit always */
#define PRINTREGS(lvl,r,f,fmt,x) \
printk("%s%s%02d-%02d " fmt " " fmt " " fmt " " fmt "\n", \
lvl, f, (x), (x+3), (r)[(x)+0], (r)[(x)+1], \
(r)[(x)+2], (r)[(x)+3])
static void print_gr(char *level, struct pt_regs *regs)
{
int i;
char buf[64];
printk("%s\n", level);
printk("%s YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI\n", level);
printbinary(buf, regs->gr[0], 32);
printk("%sPSW: %s %s\n", level, buf, print_tainted());
for (i = 0; i < 32; i += 4)
PRINTREGS(level, regs->gr, "r", RFMT, i);
}
static void print_fr(char *level, struct pt_regs *regs)
{
int i;
char buf[64];
struct { u32 sw[2]; } s;
/* FR are 64bit everywhere. Need to use asm to get the content
* of fpsr/fper1, and we assume that we won't have a FP Identify
* in our way, otherwise we're screwed.
* The fldd is used to restore the T-bit if there was one, as the
* store clears it anyway.
* PA2.0 book says "thou shall not use fstw on FPSR/FPERs" - T-Bone */
asm volatile ("fstd %%fr0,0(%1) \n\t"
"fldd 0(%1),%%fr0 \n\t"
: "=m" (s) : "r" (&s) : "r0");
printk("%s\n", level);
printk("%s VZOUICununcqcqcqcqcqcrmunTDVZOUI\n", level);
printbinary(buf, s.sw[0], 32);
printk("%sFPSR: %s\n", level, buf);
printk("%sFPER1: %08x\n", level, s.sw[1]);
/* here we'll print fr0 again, tho it'll be meaningless */
for (i = 0; i < 32; i += 4)
PRINTREGS(level, regs->fr, "fr", FFMT, i);
}
void show_regs(struct pt_regs *regs)
{
int i, user;
char *level;
unsigned long cr30, cr31;
user = user_mode(regs);
level = user ? KERN_DEBUG : KERN_CRIT;
show_regs_print_info(level);
print_gr(level, regs);
for (i = 0; i < 8; i += 4)
PRINTREGS(level, regs->sr, "sr", RFMT, i);
if (user)
print_fr(level, regs);
cr30 = mfctl(30);
cr31 = mfctl(31);
printk("%s\n", level);
printk("%sIASQ: " RFMT " " RFMT " IAOQ: " RFMT " " RFMT "\n",
level, regs->iasq[0], regs->iasq[1], regs->iaoq[0], regs->iaoq[1]);
printk("%s IIR: %08lx ISR: " RFMT " IOR: " RFMT "\n",
level, regs->iir, regs->isr, regs->ior);
printk("%s CPU: %8d CR30: " RFMT " CR31: " RFMT "\n",
level, current_thread_info()->cpu, cr30, cr31);
printk("%s ORIG_R28: " RFMT "\n", level, regs->orig_r28);
if (user) {
printk("%s IAOQ[0]: " RFMT "\n", level, regs->iaoq[0]);
printk("%s IAOQ[1]: " RFMT "\n", level, regs->iaoq[1]);
printk("%s RP(r2): " RFMT "\n", level, regs->gr[2]);
} else {
printk("%s IAOQ[0]: %pS\n", level, (void *) regs->iaoq[0]);
printk("%s IAOQ[1]: %pS\n", level, (void *) regs->iaoq[1]);
printk("%s RP(r2): %pS\n", level, (void *) regs->gr[2]);
parisc_show_stack(current, NULL, regs);
}
}
static DEFINE_RATELIMIT_STATE(_hppa_rs,
DEFAULT_RATELIMIT_INTERVAL, DEFAULT_RATELIMIT_BURST);
#define parisc_printk_ratelimited(critical, regs, fmt, ...) { \
if ((critical || show_unhandled_signals) && __ratelimit(&_hppa_rs)) { \
printk(fmt, ##__VA_ARGS__); \
show_regs(regs); \
} \
}
static void do_show_stack(struct unwind_frame_info *info)
{
int i = 1;
printk(KERN_CRIT "Backtrace:\n");
while (i <= 16) {
if (unwind_once(info) < 0 || info->ip == 0)
break;
if (__kernel_text_address(info->ip)) {
printk(KERN_CRIT " [<" RFMT ">] %pS\n",
info->ip, (void *) info->ip);
i++;
}
}
printk(KERN_CRIT "\n");
}
static void parisc_show_stack(struct task_struct *task, unsigned long *sp,
struct pt_regs *regs)
{
struct unwind_frame_info info;
struct task_struct *t;
t = task ? task : current;
if (regs) {
unwind_frame_init(&info, t, regs);
goto show_stack;
}
if (t == current) {
unsigned long sp;
HERE:
asm volatile ("copy %%r30, %0" : "=r"(sp));
{
struct pt_regs r;
memset(&r, 0, sizeof(struct pt_regs));
r.iaoq[0] = (unsigned long)&&HERE;
r.gr[2] = (unsigned long)__builtin_return_address(0);
r.gr[30] = sp;
unwind_frame_init(&info, current, &r);
}
} else {
unwind_frame_init_from_blocked_task(&info, t);
}
show_stack:
do_show_stack(&info);
}
void show_stack(struct task_struct *t, unsigned long *sp)
{
return parisc_show_stack(t, sp, NULL);
}
int is_valid_bugaddr(unsigned long iaoq)
{
return 1;
}
void die_if_kernel(char *str, struct pt_regs *regs, long err)
{
if (user_mode(regs)) {
if (err == 0)
return; /* STFU */
parisc_printk_ratelimited(1, regs,
KERN_CRIT "%s (pid %d): %s (code %ld) at " RFMT "\n",
current->comm, task_pid_nr(current), str, err, regs->iaoq[0]);
return;
}
oops_in_progress = 1;
oops_enter();
/* Amuse the user in a SPARC fashion */
if (err) printk(KERN_CRIT
" _______________________________ \n"
" < Your System ate a SPARC! Gah! >\n"
" ------------------------------- \n"
" \\ ^__^\n"
" (__)\\ )\\/\\\n"
" U ||----w |\n"
" || ||\n");
/* unlock the pdc lock if necessary */
pdc_emergency_unlock();
/* maybe the kernel hasn't booted very far yet and hasn't been able
* to initialize the serial or STI console. In that case we should
* re-enable the pdc console, so that the user will be able to
* identify the problem. */
if (!console_drivers)
pdc_console_restart();
if (err)
printk(KERN_CRIT "%s (pid %d): %s (code %ld)\n",
current->comm, task_pid_nr(current), str, err);
/* Wot's wrong wif bein' racy? */
if (current->thread.flags & PARISC_KERNEL_DEATH) {
printk(KERN_CRIT "%s() recursion detected.\n", __func__);
local_irq_enable();
while (1);
}
current->thread.flags |= PARISC_KERNEL_DEATH;
show_regs(regs);
dump_stack();
add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
if (in_interrupt())
panic("Fatal exception in interrupt");
if (panic_on_oops)
panic("Fatal exception");
oops_exit();
do_exit(SIGSEGV);
}
/* gdb uses break 4,8 */
#define GDB_BREAK_INSN 0x10004
static void handle_gdb_break(struct pt_regs *regs, int wot)
{
struct siginfo si;
si.si_signo = SIGTRAP;
si.si_errno = 0;
si.si_code = wot;
si.si_addr = (void __user *) (regs->iaoq[0] & ~3);
force_sig_info(SIGTRAP, &si, current);
}
static void handle_break(struct pt_regs *regs)
{
unsigned iir = regs->iir;
if (unlikely(iir == PARISC_BUG_BREAK_INSN && !user_mode(regs))) {
/* check if a BUG() or WARN() trapped here. */
enum bug_trap_type tt;
tt = report_bug(regs->iaoq[0] & ~3, regs);
if (tt == BUG_TRAP_TYPE_WARN) {
regs->iaoq[0] += 4;
regs->iaoq[1] += 4;
return; /* return to next instruction when WARN_ON(). */
}
die_if_kernel("Unknown kernel breakpoint", regs,
(tt == BUG_TRAP_TYPE_NONE) ? 9 : 0);
}
if (unlikely(iir != GDB_BREAK_INSN))
parisc_printk_ratelimited(0, regs,
KERN_DEBUG "break %d,%d: pid=%d command='%s'\n",
iir & 31, (iir>>13) & ((1<<13)-1),
task_pid_nr(current), current->comm);
/* send standard GDB signal */
handle_gdb_break(regs, TRAP_BRKPT);
}
static void default_trap(int code, struct pt_regs *regs)
{
printk(KERN_ERR "Trap %d on CPU %d\n", code, smp_processor_id());
show_regs(regs);
}
void (*cpu_lpmc) (int code, struct pt_regs *regs) __read_mostly = default_trap;
void transfer_pim_to_trap_frame(struct pt_regs *regs)
{
register int i;
extern unsigned int hpmc_pim_data[];
struct pdc_hpmc_pim_11 *pim_narrow;
struct pdc_hpmc_pim_20 *pim_wide;
if (boot_cpu_data.cpu_type >= pcxu) {
pim_wide = (struct pdc_hpmc_pim_20 *)hpmc_pim_data;
/*
* Note: The following code will probably generate a
* bunch of truncation error warnings from the compiler.
* Could be handled with an ifdef, but perhaps there
* is a better way.
*/
regs->gr[0] = pim_wide->cr[22];
for (i = 1; i < 32; i++)
regs->gr[i] = pim_wide->gr[i];
for (i = 0; i < 32; i++)
regs->fr[i] = pim_wide->fr[i];
for (i = 0; i < 8; i++)
regs->sr[i] = pim_wide->sr[i];
regs->iasq[0] = pim_wide->cr[17];
regs->iasq[1] = pim_wide->iasq_back;
regs->iaoq[0] = pim_wide->cr[18];
regs->iaoq[1] = pim_wide->iaoq_back;
regs->sar = pim_wide->cr[11];
regs->iir = pim_wide->cr[19];
regs->isr = pim_wide->cr[20];
regs->ior = pim_wide->cr[21];
}
else {
pim_narrow = (struct pdc_hpmc_pim_11 *)hpmc_pim_data;
regs->gr[0] = pim_narrow->cr[22];
for (i = 1; i < 32; i++)
regs->gr[i] = pim_narrow->gr[i];
for (i = 0; i < 32; i++)
regs->fr[i] = pim_narrow->fr[i];
for (i = 0; i < 8; i++)
regs->sr[i] = pim_narrow->sr[i];
regs->iasq[0] = pim_narrow->cr[17];
regs->iasq[1] = pim_narrow->iasq_back;
regs->iaoq[0] = pim_narrow->cr[18];
regs->iaoq[1] = pim_narrow->iaoq_back;
regs->sar = pim_narrow->cr[11];
regs->iir = pim_narrow->cr[19];
regs->isr = pim_narrow->cr[20];
regs->ior = pim_narrow->cr[21];
}
/*
* The following fields only have meaning if we came through
* another path. So just zero them here.
*/
regs->ksp = 0;
regs->kpc = 0;
regs->orig_r28 = 0;
}
/*
* This routine is called as a last resort when everything else
* has gone clearly wrong. We get called for faults in kernel space,
* and HPMC's.
*/
void parisc_terminate(char *msg, struct pt_regs *regs, int code, unsigned long offset)
{
static DEFINE_SPINLOCK(terminate_lock);
oops_in_progress = 1;
set_eiem(0);
local_irq_disable();
spin_lock(&terminate_lock);
/* unlock the pdc lock if necessary */
pdc_emergency_unlock();
/* restart pdc console if necessary */
if (!console_drivers)
pdc_console_restart();
/* Not all paths will gutter the processor... */
switch(code){
case 1:
transfer_pim_to_trap_frame(regs);
break;
default:
/* Fall through */
break;
}
{
/* show_stack(NULL, (unsigned long *)regs->gr[30]); */
struct unwind_frame_info info;
unwind_frame_init(&info, current, regs);
do_show_stack(&info);
}
printk("\n");
pr_crit("%s: Code=%d (%s) regs=%p (Addr=" RFMT ")\n",
msg, code, trap_name(code), regs, offset);
show_regs(regs);
spin_unlock(&terminate_lock);
/* put soft power button back under hardware control;
* if the user had pressed it once at any time, the
* system will shut down immediately right here. */
pdc_soft_power_button(0);
/* Call kernel panic() so reboot timeouts work properly
* FIXME: This function should be on the list of
* panic notifiers, and we should call panic
* directly from the location that we wish.
* e.g. We should not call panic from
* parisc_terminate, but rather the oter way around.
* This hack works, prints the panic message twice,
* and it enables reboot timers!
*/
panic(msg);
}
void notrace handle_interruption(int code, struct pt_regs *regs)
{
unsigned long fault_address = 0;
unsigned long fault_space = 0;
struct siginfo si;
if (code == 1)
pdc_console_restart(); /* switch back to pdc if HPMC */
else
local_irq_enable();
/* Security check:
* If the priority level is still user, and the
* faulting space is not equal to the active space
* then the user is attempting something in a space
* that does not belong to them. Kill the process.
*
* This is normally the situation when the user
* attempts to jump into the kernel space at the
* wrong offset, be it at the gateway page or a
* random location.
*
* We cannot normally signal the process because it
* could *be* on the gateway page, and processes
* executing on the gateway page can't have signals
* delivered.
*
* We merely readjust the address into the users
* space, at a destination address of zero, and
* allow processing to continue.
*/
if (((unsigned long)regs->iaoq[0] & 3) &&
((unsigned long)regs->iasq[0] != (unsigned long)regs->sr[7])) {
/* Kill the user process later */
regs->iaoq[0] = 0 | 3;
regs->iaoq[1] = regs->iaoq[0] + 4;
regs->iasq[0] = regs->iasq[1] = regs->sr[7];
regs->gr[0] &= ~PSW_B;
return;
}
#if 0
printk(KERN_CRIT "Interruption # %d\n", code);
#endif
switch(code) {
case 1:
/* High-priority machine check (HPMC) */
/* set up a new led state on systems shipped with a LED State panel */
pdc_chassis_send_status(PDC_CHASSIS_DIRECT_HPMC);
parisc_terminate("High Priority Machine Check (HPMC)",
regs, code, 0);
/* NOT REACHED */
case 2:
/* Power failure interrupt */
printk(KERN_CRIT "Power failure interrupt !\n");
return;
case 3:
/* Recovery counter trap */
regs->gr[0] &= ~PSW_R;
if (user_space(regs))
handle_gdb_break(regs, TRAP_TRACE);
/* else this must be the start of a syscall - just let it run */
return;
case 5:
/* Low-priority machine check */
pdc_chassis_send_status(PDC_CHASSIS_DIRECT_LPMC);
flush_cache_all();
flush_tlb_all();
cpu_lpmc(5, regs);
return;
case 6:
/* Instruction TLB miss fault/Instruction page fault */
fault_address = regs->iaoq[0];
fault_space = regs->iasq[0];
break;
case 8:
/* Illegal instruction trap */
die_if_kernel("Illegal instruction", regs, code);
si.si_code = ILL_ILLOPC;
goto give_sigill;
case 9:
/* Break instruction trap */
handle_break(regs);
return;
case 10:
/* Privileged operation trap */
die_if_kernel("Privileged operation", regs, code);
si.si_code = ILL_PRVOPC;
goto give_sigill;
case 11:
/* Privileged register trap */
if ((regs->iir & 0xffdfffe0) == 0x034008a0) {
/* This is a MFCTL cr26/cr27 to gr instruction.
* PCXS traps on this, so we need to emulate it.
*/
if (regs->iir & 0x00200000)
regs->gr[regs->iir & 0x1f] = mfctl(27);
else
regs->gr[regs->iir & 0x1f] = mfctl(26);
regs->iaoq[0] = regs->iaoq[1];
regs->iaoq[1] += 4;
regs->iasq[0] = regs->iasq[1];
return;
}
die_if_kernel("Privileged register usage", regs, code);
si.si_code = ILL_PRVREG;
give_sigill:
si.si_signo = SIGILL;
si.si_errno = 0;
si.si_addr = (void __user *) regs->iaoq[0];
force_sig_info(SIGILL, &si, current);
return;
case 12:
/* Overflow Trap, let the userland signal handler do the cleanup */
si.si_signo = SIGFPE;
si.si_code = FPE_INTOVF;
si.si_addr = (void __user *) regs->iaoq[0];
force_sig_info(SIGFPE, &si, current);
return;
case 13:
/* Conditional Trap
The condition succeeds in an instruction which traps
on condition */
if(user_mode(regs)){
si.si_signo = SIGFPE;
/* Set to zero, and let the userspace app figure it out from
the insn pointed to by si_addr */
si.si_code = 0;
si.si_addr = (void __user *) regs->iaoq[0];
force_sig_info(SIGFPE, &si, current);
return;
}
/* The kernel doesn't want to handle condition codes */
break;
case 14:
/* Assist Exception Trap, i.e. floating point exception. */
die_if_kernel("Floating point exception", regs, 0); /* quiet */
__inc_irq_stat(irq_fpassist_count);
handle_fpe(regs);
return;
case 15:
/* Data TLB miss fault/Data page fault */
/* Fall through */
case 16:
/* Non-access instruction TLB miss fault */
/* The instruction TLB entry needed for the target address of the FIC
is absent, and hardware can't find it, so we get to cleanup */
/* Fall through */
case 17:
/* Non-access data TLB miss fault/Non-access data page fault */
/* FIXME:
Still need to add slow path emulation code here!
If the insn used a non-shadow register, then the tlb
handlers could not have their side-effect (e.g. probe
writing to a target register) emulated since rfir would
erase the changes to said register. Instead we have to
setup everything, call this function we are in, and emulate
by hand. Technically we need to emulate:
fdc,fdce,pdc,"fic,4f",prober,probeir,probew, probeiw
*/
fault_address = regs->ior;
fault_space = regs->isr;
break;
case 18:
/* PCXS only -- later cpu's split this into types 26,27 & 28 */
/* Check for unaligned access */
if (check_unaligned(regs)) {
handle_unaligned(regs);
return;
}
/* Fall Through */
case 26:
/* PCXL: Data memory access rights trap */
fault_address = regs->ior;
fault_space = regs->isr;
break;
case 19:
/* Data memory break trap */
regs->gr[0] |= PSW_X; /* So we can single-step over the trap */
/* fall thru */
case 21:
/* Page reference trap */
handle_gdb_break(regs, TRAP_HWBKPT);
return;
case 25:
/* Taken branch trap */
regs->gr[0] &= ~PSW_T;
if (user_space(regs))
handle_gdb_break(regs, TRAP_BRANCH);
/* else this must be the start of a syscall - just let it
* run.
*/
return;
case 7:
/* Instruction access rights */
/* PCXL: Instruction memory protection trap */
/*
* This could be caused by either: 1) a process attempting
* to execute within a vma that does not have execute
* permission, or 2) an access rights violation caused by a
* flush only translation set up by ptep_get_and_clear().
* So we check the vma permissions to differentiate the two.
* If the vma indicates we have execute permission, then
* the cause is the latter one. In this case, we need to
* call do_page_fault() to fix the problem.
*/
if (user_mode(regs)) {
struct vm_area_struct *vma;
down_read(&current->mm->mmap_sem);
vma = find_vma(current->mm,regs->iaoq[0]);
if (vma && (regs->iaoq[0] >= vma->vm_start)
&& (vma->vm_flags & VM_EXEC)) {
fault_address = regs->iaoq[0];
fault_space = regs->iasq[0];
up_read(&current->mm->mmap_sem);
break; /* call do_page_fault() */
}
up_read(&current->mm->mmap_sem);
}
/* Fall Through */
case 27:
/* Data memory protection ID trap */
if (code == 27 && !user_mode(regs) &&
fixup_exception(regs))
return;
die_if_kernel("Protection id trap", regs, code);
si.si_code = SEGV_MAPERR;
si.si_signo = SIGSEGV;
si.si_errno = 0;
if (code == 7)
si.si_addr = (void __user *) regs->iaoq[0];
else
si.si_addr = (void __user *) regs->ior;
force_sig_info(SIGSEGV, &si, current);
return;
case 28:
/* Unaligned data reference trap */
handle_unaligned(regs);
return;
default:
if (user_mode(regs)) {
parisc_printk_ratelimited(0, regs, KERN_DEBUG
"handle_interruption() pid=%d command='%s'\n",
task_pid_nr(current), current->comm);
/* SIGBUS, for lack of a better one. */
si.si_signo = SIGBUS;
si.si_code = BUS_OBJERR;
si.si_errno = 0;
si.si_addr = (void __user *) regs->ior;
force_sig_info(SIGBUS, &si, current);
return;
}
pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
parisc_terminate("Unexpected interruption", regs, code, 0);
/* NOT REACHED */
}
if (user_mode(regs)) {
if ((fault_space >> SPACEID_SHIFT) != (regs->sr[7] >> SPACEID_SHIFT)) {
parisc_printk_ratelimited(0, regs, KERN_DEBUG
"User fault %d on space 0x%08lx, pid=%d command='%s'\n",
code, fault_space,
task_pid_nr(current), current->comm);
si.si_signo = SIGSEGV;
si.si_errno = 0;
si.si_code = SEGV_MAPERR;
si.si_addr = (void __user *) regs->ior;
force_sig_info(SIGSEGV, &si, current);
return;
}
}
else {
/*
* The kernel should never fault on its own address space,
* unless pagefault_disable() was called before.
*/
if (fault_space == 0 && !faulthandler_disabled())
{
/* Clean up and return if in exception table. */
if (fixup_exception(regs))
return;
pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
parisc_terminate("Kernel Fault", regs, code, fault_address);
}
}
do_page_fault(regs, code, fault_address);
}
void __init initialize_ivt(const void *iva)
{
extern u32 os_hpmc_size;
extern const u32 os_hpmc[];
int i;
u32 check = 0;
u32 *ivap;
u32 *hpmcp;
u32 length, instr;
if (strcmp((const char *)iva, "cows can fly"))
panic("IVT invalid");
ivap = (u32 *)iva;
for (i = 0; i < 8; i++)
*ivap++ = 0;
/*
* Use PDC_INSTR firmware function to get instruction that invokes
* PDCE_CHECK in HPMC handler. See programming note at page 1-31 of
* the PA 1.1 Firmware Architecture document.
*/
if (pdc_instr(&instr) == PDC_OK)
ivap[0] = instr;
/* Compute Checksum for HPMC handler */
length = os_hpmc_size;
ivap[7] = length;
hpmcp = (u32 *)os_hpmc;
for (i=0; i<length/4; i++)
check += *hpmcp++;
for (i=0; i<8; i++)
check += ivap[i];
ivap[5] = -check;
}
/* early_trap_init() is called before we set up kernel mappings and
* write-protect the kernel */
void __init early_trap_init(void)
{
extern const void fault_vector_20;
#ifndef CONFIG_64BIT
extern const void fault_vector_11;
initialize_ivt(&fault_vector_11);
#endif
initialize_ivt(&fault_vector_20);
}
void __init trap_init(void)
{
}
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