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[SPARC64]: Detect trap frames in stack backtraces. 

Now that we have a magic cookie in the pt_regs, we can
properly detect trap frames in stack bactraces.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2008-04-24 03:28:52 -07:00
parent 7697daaa89
commit 77c664fa58
2 changed files with 28 additions and 7 deletions
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16
arch/sparc64/kernel/stacktrace.c
View File

@ -20,6 +20,8 @@ void save_stack_trace(struct stack_trace *trace)
thread_base = (unsigned long) tp;
do {
struct reg_window *rw;
struct pt_regs *regs;
unsigned long pc;
/* Bogus frame pointer? */
if (fp < (thread_base + sizeof(struct thread_info)) ||
@ -27,11 +29,19 @@ void save_stack_trace(struct stack_trace *trace)
break;
rw = (struct reg_window *) fp;
regs = (struct pt_regs *) (rw + 1);
if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC) {
pc = regs->tpc;
fp = regs->u_regs[UREG_I6] + STACK_BIAS;
} else {
pc = rw->ins[7];
fp = rw->ins[6] + STACK_BIAS;
}
if (trace->skip > 0)
trace->skip--;
else
trace->entries[trace->nr_entries++] = rw->ins[7];
fp = rw->ins[6] + STACK_BIAS;
trace->entries[trace->nr_entries++] = pc;
} while (trace->nr_entries < trace->max_entries);
}

17
arch/sparc64/kernel/traps.c
View File

@ -2091,9 +2091,8 @@ static void user_instruction_dump(unsigned int __user *pc)
void show_stack(struct task_struct *tsk, unsigned long *_ksp)
{
unsigned long pc, fp, thread_base, ksp;
unsigned long fp, thread_base, ksp;
struct thread_info *tp;
struct reg_window *rw;
int count = 0;
ksp = (unsigned long) _ksp;
@ -2117,15 +2116,27 @@ void show_stack(struct task_struct *tsk, unsigned long *_ksp)
printk("\n");
#endif
do {
struct reg_window *rw;
struct pt_regs *regs;
unsigned long pc;
/* Bogus frame pointer? */
if (fp < (thread_base + sizeof(struct thread_info)) ||
fp >= (thread_base + THREAD_SIZE))
break;
rw = (struct reg_window *)fp;
regs = (struct pt_regs *) (rw + 1);
if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC) {
pc = regs->tpc;
fp = regs->u_regs[UREG_I6] + STACK_BIAS;
} else {
pc = rw->ins[7];
fp = rw->ins[6] + STACK_BIAS;
}
printk(" [%016lx] ", pc);
print_symbol("%s\n", pc);
fp = rw->ins[6] + STACK_BIAS;
} while (++count < 16);
#ifndef CONFIG_KALLSYMS
printk("\n");