linux/arch/sparc/kernel/stacktrace.c
Paul Gortmaker 066bcaca51 sparc: move symbol exporters to use export.h not module.h
Many of the core sparc kernel files are not modules, but just
including module.h for exporting symbols.  Now these files can
use the lighter footprint export.h for this role.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-31 19:30:53 -04:00

85 lines
2 KiB
C

#include <linux/sched.h>
#include <linux/stacktrace.h>
#include <linux/thread_info.h>
#include <linux/ftrace.h>
#include <linux/export.h>
#include <asm/ptrace.h>
#include <asm/stacktrace.h>
#include "kstack.h"
static void __save_stack_trace(struct thread_info *tp,
struct stack_trace *trace,
bool skip_sched)
{
unsigned long ksp, fp;
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
struct task_struct *t;
int graph = 0;
#endif
if (tp == current_thread_info()) {
stack_trace_flush();
__asm__ __volatile__("mov %%fp, %0" : "=r" (ksp));
} else {
ksp = tp->ksp;
}
fp = ksp + STACK_BIAS;
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
t = tp->task;
#endif
do {
struct sparc_stackf *sf;
struct pt_regs *regs;
unsigned long pc;
if (!kstack_valid(tp, fp))
break;
sf = (struct sparc_stackf *) fp;
regs = (struct pt_regs *) (sf + 1);
if (kstack_is_trap_frame(tp, regs)) {
if (!(regs->tstate & TSTATE_PRIV))
break;
pc = regs->tpc;
fp = regs->u_regs[UREG_I6] + STACK_BIAS;
} else {
pc = sf->callers_pc;
fp = (unsigned long)sf->fp + STACK_BIAS;
}
if (trace->skip > 0)
trace->skip--;
else if (!skip_sched || !in_sched_functions(pc)) {
trace->entries[trace->nr_entries++] = pc;
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
if ((pc + 8UL) == (unsigned long) &return_to_handler) {
int index = t->curr_ret_stack;
if (t->ret_stack && index >= graph) {
pc = t->ret_stack[index - graph].ret;
if (trace->nr_entries <
trace->max_entries)
trace->entries[trace->nr_entries++] = pc;
graph++;
}
}
#endif
}
} while (trace->nr_entries < trace->max_entries);
}
void save_stack_trace(struct stack_trace *trace)
{
__save_stack_trace(current_thread_info(), trace, false);
}
EXPORT_SYMBOL_GPL(save_stack_trace);
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
{
struct thread_info *tp = task_thread_info(tsk);
__save_stack_trace(tp, trace, true);
}
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);