simplify the stacktrace code
[linux-3.10.git] / 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
6 void save_stack_trace(struct stack_trace *trace)
7 {
8         unsigned long ksp, fp, thread_base;
9         struct thread_info *tp = task_thread_info(current);
10
11         flushw_all();
12         __asm__ __volatile__(
13                 "mov    %%fp, %0"
14                 : "=r" (ksp)
15         );
16
17         fp = ksp + STACK_BIAS;
18         thread_base = (unsigned long) tp;
19         do {
20                 struct reg_window *rw;
21
22                 /* Bogus frame pointer? */
23                 if (fp < (thread_base + sizeof(struct thread_info)) ||
24                     fp >= (thread_base + THREAD_SIZE))
25                         break;
26
27                 rw = (struct reg_window *) fp;
28                 if (trace->skip > 0)
29                         trace->skip--;
30                 else
31                         trace->entries[trace->nr_entries++] = rw->ins[7];
32
33                 fp = rw->ins[6] + STACK_BIAS;
34         } while (trace->nr_entries < trace->max_entries);
35 }