Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes...
[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 <asm/ptrace.h>
5 #include <asm/stacktrace.h>
6
7 void save_stack_trace(struct stack_trace *trace)
8 {
9         unsigned long ksp, fp, thread_base;
10         struct thread_info *tp = task_thread_info(current);
11
12         stack_trace_flush();
13
14         __asm__ __volatile__(
15                 "mov    %%fp, %0"
16                 : "=r" (ksp)
17         );
18
19         fp = ksp + STACK_BIAS;
20         thread_base = (unsigned long) tp;
21         do {
22                 struct reg_window *rw;
23                 struct pt_regs *regs;
24                 unsigned long pc;
25
26                 /* Bogus frame pointer? */
27                 if (fp < (thread_base + sizeof(struct thread_info)) ||
28                     fp >= (thread_base + THREAD_SIZE))
29                         break;
30
31                 rw = (struct reg_window *) fp;
32                 regs = (struct pt_regs *) (rw + 1);
33
34                 if ((regs->magic & ~0x1ff) == PT_REGS_MAGIC) {
35                         pc = regs->tpc;
36                         fp = regs->u_regs[UREG_I6] + STACK_BIAS;
37                 } else {
38                         pc = rw->ins[7];
39                         fp = rw->ins[6] + STACK_BIAS;
40                 }
41
42                 if (trace->skip > 0)
43                         trace->skip--;
44                 else
45                         trace->entries[trace->nr_entries++] = pc;
46         } while (trace->nr_entries < trace->max_entries);
47 }