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Diffstat (limited to 'arch/mips/kernel/traps.c')
-rw-r--r--arch/mips/kernel/traps.c70
1 files changed, 42 insertions, 28 deletions
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index e207a43b5f8f..fdb392b27e81 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -192,6 +192,7 @@ static void show_stacktrace(struct task_struct *task,
void show_stack(struct task_struct *task, unsigned long *sp)
{
struct pt_regs regs;
+ mm_segment_t old_fs = get_fs();
if (sp) {
regs.regs[29] = (unsigned long)sp;
regs.regs[31] = 0;
@@ -210,7 +211,13 @@ void show_stack(struct task_struct *task, unsigned long *sp)
prepare_frametrace(&regs);
}
}
+ /*
+ * show_stack() deals exclusively with kernel mode, so be sure to access
+ * the stack in the kernel (not user) address space.
+ */
+ set_fs(KERNEL_DS);
show_stacktrace(task, &regs);
+ set_fs(old_fs);
}
static void show_code(unsigned int __user *pc)
@@ -363,11 +370,6 @@ void show_registers(struct pt_regs *regs)
set_fs(old_fs);
}
-static int regs_to_trapnr(struct pt_regs *regs)
-{
- return (regs->cp0_cause >> 2) & 0x1f;
-}
-
static DEFINE_RAW_SPINLOCK(die_lock);
void __noreturn die(const char *str, struct pt_regs *regs)
@@ -377,7 +379,7 @@ void __noreturn die(const char *str, struct pt_regs *regs)
oops_enter();
- if (notify_die(DIE_OOPS, str, regs, 0, regs_to_trapnr(regs),
+ if (notify_die(DIE_OOPS, str, regs, 0, current->thread.trap_nr,
SIGSEGV) == NOTIFY_STOP)
sig = 0;
@@ -463,7 +465,7 @@ asmlinkage void do_be(struct pt_regs *regs)
printk(KERN_ALERT "%s bus error, epc == %0*lx, ra == %0*lx\n",
data ? "Data" : "Instruction",
field, regs->cp0_epc, field, regs->regs[31]);
- if (notify_die(DIE_OOPS, "bus error", regs, 0, regs_to_trapnr(regs),
+ if (notify_die(DIE_OOPS, "bus error", regs, 0, current->thread.trap_nr,
SIGBUS) == NOTIFY_STOP)
goto out;
@@ -819,7 +821,7 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
int sig;
prev_state = exception_enter();
- if (notify_die(DIE_FP, "FP exception", regs, 0, regs_to_trapnr(regs),
+ if (notify_die(DIE_FP, "FP exception", regs, 0, current->thread.trap_nr,
SIGFPE) == NOTIFY_STOP)
goto out;
@@ -875,11 +877,12 @@ void do_trap_or_bp(struct pt_regs *regs, unsigned int code,
char b[40];
#ifdef CONFIG_KGDB_LOW_LEVEL_TRAP
- if (kgdb_ll_trap(DIE_TRAP, str, regs, code, regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP)
+ if (kgdb_ll_trap(DIE_TRAP, str, regs, code, current->thread.trap_nr,
+ SIGTRAP) == NOTIFY_STOP)
return;
#endif /* CONFIG_KGDB_LOW_LEVEL_TRAP */
- if (notify_die(DIE_TRAP, str, regs, code, regs_to_trapnr(regs),
+ if (notify_die(DIE_TRAP, str, regs, code, current->thread.trap_nr,
SIGTRAP) == NOTIFY_STOP)
return;
@@ -941,6 +944,7 @@ asmlinkage void do_bp(struct pt_regs *regs)
set_fs(KERNEL_DS);
prev_state = exception_enter();
+ current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f;
if (get_isa16_mode(regs->cp0_epc)) {
u16 instr[2];
@@ -980,15 +984,27 @@ asmlinkage void do_bp(struct pt_regs *regs)
* pertain to them.
*/
switch (bcode) {
+ case BRK_UPROBE:
+ if (notify_die(DIE_UPROBE, "uprobe", regs, bcode,
+ current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP)
+ goto out;
+ else
+ break;
+ case BRK_UPROBE_XOL:
+ if (notify_die(DIE_UPROBE_XOL, "uprobe_xol", regs, bcode,
+ current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP)
+ goto out;
+ else
+ break;
case BRK_KPROBE_BP:
if (notify_die(DIE_BREAK, "debug", regs, bcode,
- regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP)
+ current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP)
goto out;
else
break;
case BRK_KPROBE_SSTEPBP:
if (notify_die(DIE_SSTEPBP, "single_step", regs, bcode,
- regs_to_trapnr(regs), SIGTRAP) == NOTIFY_STOP)
+ current->thread.trap_nr, SIGTRAP) == NOTIFY_STOP)
goto out;
else
break;
@@ -1021,6 +1037,7 @@ asmlinkage void do_tr(struct pt_regs *regs)
set_fs(get_ds());
prev_state = exception_enter();
+ current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f;
if (get_isa16_mode(regs->cp0_epc)) {
if (__get_user(instr[0], (u16 __user *)(epc + 0)) ||
__get_user(instr[1], (u16 __user *)(epc + 2)))
@@ -1087,8 +1104,9 @@ asmlinkage void do_ri(struct pt_regs *regs)
no_r2_instr:
prev_state = exception_enter();
+ current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f;
- if (notify_die(DIE_RI, "RI Fault", regs, 0, regs_to_trapnr(regs),
+ if (notify_die(DIE_RI, "RI Fault", regs, 0, current->thread.trap_nr,
SIGILL) == NOTIFY_STOP)
goto out;
@@ -1437,8 +1455,9 @@ asmlinkage void do_msa_fpe(struct pt_regs *regs, unsigned int msacsr)
enum ctx_state prev_state;
prev_state = exception_enter();
+ current->thread.trap_nr = (regs->cp0_cause >> 2) & 0x1f;
if (notify_die(DIE_MSAFP, "MSA FP exception", regs, 0,
- regs_to_trapnr(regs), SIGFPE) == NOTIFY_STOP)
+ current->thread.trap_nr, SIGFPE) == NOTIFY_STOP)
goto out;
/* Clear MSACSR.Cause before enabling interrupts */
@@ -1516,32 +1535,26 @@ asmlinkage void do_watch(struct pt_regs *regs)
asmlinkage void do_mcheck(struct pt_regs *regs)
{
- const int field = 2 * sizeof(unsigned long);
int multi_match = regs->cp0_status & ST0_TS;
enum ctx_state prev_state;
+ mm_segment_t old_fs = get_fs();
prev_state = exception_enter();
show_regs(regs);
if (multi_match) {
- pr_err("Index : %0x\n", read_c0_index());
- pr_err("Pagemask: %0x\n", read_c0_pagemask());
- pr_err("EntryHi : %0*lx\n", field, read_c0_entryhi());
- pr_err("EntryLo0: %0*lx\n", field, read_c0_entrylo0());
- pr_err("EntryLo1: %0*lx\n", field, read_c0_entrylo1());
- pr_err("Wired : %0x\n", read_c0_wired());
- pr_err("Pagegrain: %0x\n", read_c0_pagegrain());
- if (cpu_has_htw) {
- pr_err("PWField : %0*lx\n", field, read_c0_pwfield());
- pr_err("PWSize : %0*lx\n", field, read_c0_pwsize());
- pr_err("PWCtl : %0x\n", read_c0_pwctl());
- }
- pr_err("\n");
+ dump_tlb_regs();
+ pr_info("\n");
dump_tlb_all();
}
+ if (!user_mode(regs))
+ set_fs(KERNEL_DS);
+
show_code((unsigned int __user *) regs->cp0_epc);
+ set_fs(old_fs);
+
/*
* Some chips may have other causes of machine check (e.g. SB1
* graduation timer)
@@ -1638,6 +1651,7 @@ static inline void parity_protection_init(void)
case CPU_PROAPTIV:
case CPU_P5600:
case CPU_QEMU_GENERIC:
+ case CPU_I6400:
{
#define ERRCTL_PE 0x80000000
#define ERRCTL_L2P 0x00800000
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