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Diffstat (limited to 'arch/parisc/kernel/traps.c')
-rw-r--r--arch/parisc/kernel/traps.c97
1 files changed, 41 insertions, 56 deletions
diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
index 8b58bf0b7d5..47ee620d15d 100644
--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -25,15 +25,15 @@
#include <linux/interrupt.h>
#include <linux/console.h>
#include <linux/bug.h>
+#include <linux/ratelimit.h>
#include <asm/assembly.h>
-#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/unaligned.h>
-#include <asm/atomic.h>
+#include <linux/atomic.h>
#include <asm/smp.h>
#include <asm/pdc.h>
#include <asm/pdc_chassis.h>
@@ -43,9 +43,6 @@
#include "../math-emu/math-emu.h" /* for handle_fpe() */
-#define PRINT_USER_FAULTS /* (turn this on if you want user faults to be */
- /* dumped to the console via printk) */
-
#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
DEFINE_SPINLOCK(pa_dbit_lock);
#endif
@@ -127,6 +124,8 @@ void show_regs(struct pt_regs *regs)
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)
@@ -159,13 +158,16 @@ void show_regs(struct pt_regs *regs)
}
}
+static DEFINE_RATELIMIT_STATE(_hppa_rs,
+ DEFAULT_RATELIMIT_INTERVAL, DEFAULT_RATELIMIT_BURST);
-void dump_stack(void)
-{
- show_stack(NULL, NULL);
+#define parisc_printk_ratelimited(critical, regs, fmt, ...) { \
+ if ((critical || show_unhandled_signals) && __ratelimit(&_hppa_rs)) { \
+ printk(fmt, ##__VA_ARGS__); \
+ show_regs(regs); \
+ } \
}
-EXPORT_SYMBOL(dump_stack);
static void do_show_stack(struct unwind_frame_info *info)
{
@@ -236,12 +238,10 @@ void die_if_kernel(char *str, struct pt_regs *regs, long err)
if (err == 0)
return; /* STFU */
- printk(KERN_CRIT "%s (pid %d): %s (code %ld) at " RFMT "\n",
+ 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]);
-#ifdef PRINT_USER_FAULTS
- /* XXX for debugging only */
- show_regs(regs);
-#endif
+
return;
}
@@ -283,7 +283,7 @@ void die_if_kernel(char *str, struct pt_regs *regs, long err)
show_regs(regs);
dump_stack();
- add_taint(TAINT_DIE);
+ add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
if (in_interrupt())
panic("Fatal exception in interrupt");
@@ -298,11 +298,6 @@ void die_if_kernel(char *str, struct pt_regs *regs, long err)
do_exit(SIGSEGV);
}
-int syscall_ipi(int (*syscall) (struct pt_regs *), struct pt_regs *regs)
-{
- return syscall(regs);
-}
-
/* gdb uses break 4,8 */
#define GDB_BREAK_INSN 0x10004
static void handle_gdb_break(struct pt_regs *regs, int wot)
@@ -333,14 +328,11 @@ static void handle_break(struct pt_regs *regs)
(tt == BUG_TRAP_TYPE_NONE) ? 9 : 0);
}
-#ifdef PRINT_USER_FAULTS
- if (unlikely(iir != GDB_BREAK_INSN)) {
- printk(KERN_DEBUG "break %d,%d: pid=%d command='%s'\n",
+ 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);
- show_regs(regs);
- }
-#endif
/* send standard GDB signal */
handle_gdb_break(regs, TRAP_BRKPT);
@@ -529,10 +521,10 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
*/
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;
+ /* 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->iasq[0] = regs->iasq[1] = regs->sr[7];
regs->gr[0] &= ~PSW_B;
return;
}
@@ -548,8 +540,8 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
/* 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)",
+
+ parisc_terminate("High Priority Machine Check (HPMC)",
regs, code, 0);
/* NOT REACHED */
@@ -591,13 +583,13 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
/* 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) {
@@ -641,7 +633,7 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
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 */
+ 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);
@@ -653,9 +645,10 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
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 */
@@ -667,15 +660,15 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
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
+ 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;
@@ -769,11 +762,9 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
default:
if (user_mode(regs)) {
-#ifdef PRINT_USER_FAULTS
- printk(KERN_DEBUG "\nhandle_interruption() pid=%d command='%s'\n",
- task_pid_nr(current), current->comm);
- show_regs(regs);
-#endif
+ 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;
@@ -790,16 +781,10 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
if (user_mode(regs)) {
if ((fault_space >> SPACEID_SHIFT) != (regs->sr[7] >> SPACEID_SHIFT)) {
-#ifdef PRINT_USER_FAULTS
- if (fault_space == 0)
- printk(KERN_DEBUG "User Fault on Kernel Space ");
- else
- printk(KERN_DEBUG "User Fault (long pointer) (fault %d) ",
- code);
- printk(KERN_CONT "pid=%d command='%s'\n",
- task_pid_nr(current), current->comm);
- show_regs(regs);
-#endif
+ 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;
@@ -811,14 +796,14 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
else {
/*
- * The kernel should never fault on its own address space.
+ * The kernel should never fault on its own address space,
+ * unless pagefault_disable() was called before.
*/
- if (fault_space == 0)
+ if (fault_space == 0 && !in_atomic())
{
pdc_chassis_send_status(PDC_CHASSIS_DIRECT_PANIC);
parisc_terminate("Kernel Fault", regs, code, fault_address);
-
}
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-03 18:28:42 +0000