Merge git://git.infradead.org/embedded-2.6
[linux-2.6] / arch / sparc64 / kernel / stacktrace.c
1 #include <linux/sched.h>
2 #include <linux/stacktrace.h>
3 #include <linux/thread_info.h>
4 #include <linux/module.h>
5 #include <asm/ptrace.h>
6 #include <asm/stacktrace.h>
7
8 void save_stack_trace(struct stack_trace *trace)
9 {
10         unsigned long ksp, fp, thread_base;
11         struct thread_info *tp = task_thread_info(current);
12
13         stack_trace_flush();
14
15         __asm__ __volatile__(
16                 "mov    %%fp, %0"
17                 : "=r" (ksp)
18         );
19
20         fp = ksp + STACK_BIAS;
21         thread_base = (unsigned long) tp;
22         do {
23                 struct sparc_stackf *sf;
24                 struct pt_regs *regs;
25                 unsigned long pc;
26
27                 /* Bogus frame pointer? */
28                 if (fp < (thread_base + sizeof(struct thread_info)) ||
29                     fp >= (thread_base + THREAD_SIZE))
30                         break;
31
32                 sf = (struct sparc_stackf *) fp;
33                 regs = (struct pt_regs *) (sf + 1);
34
35                 if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC) {
36                         if (!(regs->tstate & TSTATE_PRIV))
37                                 break;
38                         pc = regs->tpc;
39                         fp = regs->u_regs[UREG_I6] + STACK_BIAS;
40                 } else {
41                         pc = sf->callers_pc;
42                         fp = (unsigned long)sf->fp + STACK_BIAS;
43                 }
44
45                 if (trace->skip > 0)
46                         trace->skip--;
47                 else
48                         trace->entries[trace->nr_entries++] = pc;
49         } while (trace->nr_entries < trace->max_entries);
50 }
51 EXPORT_SYMBOL_GPL(save_stack_trace);