summaryrefslogtreecommitdiff
path: root/arch/mips/kernel/traps.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/kernel/traps.c')
-rw-r--r--arch/mips/kernel/traps.c186
1 files changed, 130 insertions, 56 deletions
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c
index ad16eceb24dd..e51d8fd9a152 100644
--- a/arch/mips/kernel/traps.c
+++ b/arch/mips/kernel/traps.c
@@ -11,7 +11,6 @@
* Copyright (C) 2000, 01 MIPS Technologies, Inc.
* Copyright (C) 2002, 2003, 2004, 2005 Maciej W. Rozycki
*/
-#include <linux/config.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/module.h>
@@ -21,6 +20,7 @@
#include <linux/spinlock.h>
#include <linux/kallsyms.h>
#include <linux/bootmem.h>
+#include <linux/interrupt.h>
#include <asm/bootinfo.h>
#include <asm/branch.h>
@@ -73,28 +73,68 @@ void (*board_nmi_handler_setup)(void);
void (*board_ejtag_handler_setup)(void);
void (*board_bind_eic_interrupt)(int irq, int regset);
-/*
- * These constant is for searching for possible module text segments.
- * MODULE_RANGE is a guess of how much space is likely to be vmalloced.
- */
-#define MODULE_RANGE (8*1024*1024)
+
+static void show_raw_backtrace(unsigned long reg29)
+{
+ unsigned long *sp = (unsigned long *)reg29;
+ unsigned long addr;
+
+ printk("Call Trace:");
+#ifdef CONFIG_KALLSYMS
+ printk("\n");
+#endif
+ while (!kstack_end(sp)) {
+ addr = *sp++;
+ if (__kernel_text_address(addr))
+ print_ip_sym(addr);
+ }
+ printk("\n");
+}
+
+#ifdef CONFIG_KALLSYMS
+static int raw_show_trace;
+static int __init set_raw_show_trace(char *str)
+{
+ raw_show_trace = 1;
+ return 1;
+}
+__setup("raw_show_trace", set_raw_show_trace);
+
+extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
+ unsigned long pc, unsigned long ra);
+
+static void show_backtrace(struct task_struct *task, struct pt_regs *regs)
+{
+ unsigned long sp = regs->regs[29];
+ unsigned long ra = regs->regs[31];
+ unsigned long pc = regs->cp0_epc;
+
+ if (raw_show_trace || !__kernel_text_address(pc)) {
+ show_raw_backtrace(sp);
+ return;
+ }
+ printk("Call Trace:\n");
+ do {
+ print_ip_sym(pc);
+ pc = unwind_stack(task, &sp, pc, ra);
+ ra = 0;
+ } while (pc);
+ printk("\n");
+}
+#else
+#define show_backtrace(task, r) show_raw_backtrace((r)->regs[29]);
+#endif
/*
* This routine abuses get_user()/put_user() to reference pointers
* with at least a bit of error checking ...
*/
-void show_stack(struct task_struct *task, unsigned long *sp)
+static void show_stacktrace(struct task_struct *task, struct pt_regs *regs)
{
const int field = 2 * sizeof(unsigned long);
long stackdata;
int i;
-
- if (!sp) {
- if (task && task != current)
- sp = (unsigned long *) task->thread.reg29;
- else
- sp = (unsigned long *) &sp;
- }
+ unsigned long *sp = (unsigned long *)regs->regs[29];
printk("Stack :");
i = 0;
@@ -115,32 +155,48 @@ void show_stack(struct task_struct *task, unsigned long *sp)
i++;
}
printk("\n");
+ show_backtrace(task, regs);
}
-void show_trace(struct task_struct *task, unsigned long *stack)
+static __always_inline void prepare_frametrace(struct pt_regs *regs)
{
- const int field = 2 * sizeof(unsigned long);
- unsigned long addr;
-
- if (!stack) {
- if (task && task != current)
- stack = (unsigned long *) task->thread.reg29;
- else
- stack = (unsigned long *) &stack;
- }
-
- printk("Call Trace:");
-#ifdef CONFIG_KALLSYMS
- printk("\n");
+ __asm__ __volatile__(
+ ".set push\n\t"
+ ".set noat\n\t"
+#ifdef CONFIG_64BIT
+ "1: dla $1, 1b\n\t"
+ "sd $1, %0\n\t"
+ "sd $29, %1\n\t"
+ "sd $31, %2\n\t"
+#else
+ "1: la $1, 1b\n\t"
+ "sw $1, %0\n\t"
+ "sw $29, %1\n\t"
+ "sw $31, %2\n\t"
#endif
- while (!kstack_end(stack)) {
- addr = *stack++;
- if (__kernel_text_address(addr)) {
- printk(" [<%0*lx>] ", field, addr);
- print_symbol("%s\n", addr);
+ ".set pop\n\t"
+ : "=m" (regs->cp0_epc),
+ "=m" (regs->regs[29]), "=m" (regs->regs[31])
+ : : "memory");
+}
+
+void show_stack(struct task_struct *task, unsigned long *sp)
+{
+ struct pt_regs regs;
+ if (sp) {
+ regs.regs[29] = (unsigned long)sp;
+ regs.regs[31] = 0;
+ regs.cp0_epc = 0;
+ } else {
+ if (task && task != current) {
+ regs.regs[29] = task->thread.reg29;
+ regs.regs[31] = 0;
+ regs.cp0_epc = task->thread.reg31;
+ } else {
+ prepare_frametrace(&regs);
}
}
- printk("\n");
+ show_stacktrace(task, &regs);
}
/*
@@ -148,9 +204,15 @@ void show_trace(struct task_struct *task, unsigned long *stack)
*/
void dump_stack(void)
{
- unsigned long stack;
+ struct pt_regs regs;
- show_trace(current, &stack);
+ /*
+ * Remove any garbage that may be in regs (specially func
+ * addresses) to avoid show_raw_backtrace() to report them
+ */
+ memset(&regs, 0, sizeof(regs));
+ prepare_frametrace(&regs);
+ show_backtrace(current, &regs);
}
EXPORT_SYMBOL(dump_stack);
@@ -269,8 +331,7 @@ void show_registers(struct pt_regs *regs)
print_modules();
printk("Process %s (pid: %d, threadinfo=%p, task=%p)\n",
current->comm, current->pid, current_thread_info(), current);
- show_stack(current, (long *) regs->regs[29]);
- show_trace(current, (long *) regs->regs[29]);
+ show_stacktrace(current, regs);
show_code((unsigned int *) regs->cp0_epc);
printk("\n");
}
@@ -293,6 +354,16 @@ NORET_TYPE void ATTRIB_NORET die(const char * str, struct pt_regs * regs)
printk("%s[#%d]:\n", str, ++die_counter);
show_registers(regs);
spin_unlock_irq(&die_lock);
+
+ if (in_interrupt())
+ panic("Fatal exception in interrupt");
+
+ if (panic_on_oops) {
+ printk(KERN_EMERG "Fatal exception: panic in 5 seconds\n");
+ ssleep(5);
+ panic("Fatal exception");
+ }
+
do_exit(SIGSEGV);
}
@@ -570,6 +641,8 @@ asmlinkage void do_ov(struct pt_regs *regs)
*/
asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
{
+ die_if_kernel("FP exception in kernel code", regs);
+
if (fcr31 & FPU_CSR_UNI_X) {
int sig;
@@ -848,31 +921,29 @@ asmlinkage void do_mt(struct pt_regs *regs)
{
int subcode;
- die_if_kernel("MIPS MT Thread exception in kernel", regs);
-
subcode = (read_vpe_c0_vpecontrol() & VPECONTROL_EXCPT)
>> VPECONTROL_EXCPT_SHIFT;
switch (subcode) {
case 0:
- printk(KERN_ERR "Thread Underflow\n");
+ printk(KERN_DEBUG "Thread Underflow\n");
break;
case 1:
- printk(KERN_ERR "Thread Overflow\n");
+ printk(KERN_DEBUG "Thread Overflow\n");
break;
case 2:
- printk(KERN_ERR "Invalid YIELD Qualifier\n");
+ printk(KERN_DEBUG "Invalid YIELD Qualifier\n");
break;
case 3:
- printk(KERN_ERR "Gating Storage Exception\n");
+ printk(KERN_DEBUG "Gating Storage Exception\n");
break;
case 4:
- printk(KERN_ERR "YIELD Scheduler Exception\n");
+ printk(KERN_DEBUG "YIELD Scheduler Exception\n");
break;
case 5:
- printk(KERN_ERR "Gating Storage Schedulier Exception\n");
+ printk(KERN_DEBUG "Gating Storage Schedulier Exception\n");
break;
default:
- printk(KERN_ERR "*** UNKNOWN THREAD EXCEPTION %d ***\n",
+ printk(KERN_DEBUG "*** UNKNOWN THREAD EXCEPTION %d ***\n",
subcode);
break;
}
@@ -981,10 +1052,10 @@ void ejtag_exception_handler(struct pt_regs *regs)
unsigned long depc, old_epc;
unsigned int debug;
- printk("SDBBP EJTAG debug exception - not handled yet, just ignored!\n");
+ printk(KERN_DEBUG "SDBBP EJTAG debug exception - not handled yet, just ignored!\n");
depc = read_c0_depc();
debug = read_c0_debug();
- printk("c0_depc = %0*lx, DEBUG = %08x\n", field, depc, debug);
+ printk(KERN_DEBUG "c0_depc = %0*lx, DEBUG = %08x\n", field, depc, debug);
if (debug & 0x80000000) {
/*
* In branch delay slot.
@@ -1002,7 +1073,7 @@ void ejtag_exception_handler(struct pt_regs *regs)
write_c0_depc(depc);
#if 0
- printk("\n\n----- Enable EJTAG single stepping ----\n\n");
+ printk(KERN_DEBUG "\n\n----- Enable EJTAG single stepping ----\n\n");
write_c0_debug(debug | 0x100);
#endif
}
@@ -1050,7 +1121,7 @@ void *set_except_vector(int n, void *addr)
return (void *)old_handler;
}
-#ifdef CONFIG_CPU_MIPSR2
+#ifdef CONFIG_CPU_MIPSR2_SRS
/*
* MIPSR2 shadow register set allocation
* FIXME: SMP...
@@ -1069,11 +1140,9 @@ static struct shadow_registers {
static void mips_srs_init(void)
{
-#ifdef CONFIG_CPU_MIPSR2_SRS
shadow_registers.sr_supported = ((read_c0_srsctl() >> 26) & 0x0f) + 1;
printk(KERN_INFO "%d MIPSR2 register sets available\n",
shadow_registers.sr_supported);
-#endif
shadow_registers.sr_allocated = 1; /* Set 0 used by kernel */
}
@@ -1198,7 +1267,14 @@ void *set_vi_handler(int n, void *addr)
{
return set_vi_srs_handler(n, addr, 0);
}
-#endif
+
+#else
+
+static inline void mips_srs_init(void)
+{
+}
+
+#endif /* CONFIG_CPU_MIPSR2_SRS */
/*
* This is used by native signal handling
@@ -1388,9 +1464,7 @@ void __init trap_init(void)
else
ebase = CAC_BASE;
-#ifdef CONFIG_CPU_MIPSR2
mips_srs_init();
-#endif
per_cpu_trap_init();
generated by cgit v1.2.3 (git 2.0.4) at 2025-06-14 17:00:02 +0000