mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 06:46:59 +07:00
68db0cf106
We are going to split <linux/sched/task_stack.h> out of <linux/sched.h>, which will have to be picked up from other headers and a couple of .c files. Create a trivial placeholder <linux/sched/task_stack.h> file that just maps to <linux/sched.h> to make this patch obviously correct and bisectable. Include the new header in the files that are going to need it. Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
142 lines
3.1 KiB
C
142 lines
3.1 KiB
C
/*
|
|
* Stack trace management functions
|
|
*
|
|
* Copyright (C) 2006-2009 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
|
|
*/
|
|
#include <linux/sched.h>
|
|
#include <linux/sched/debug.h>
|
|
#include <linux/sched/task_stack.h>
|
|
#include <linux/stacktrace.h>
|
|
#include <linux/export.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/stacktrace.h>
|
|
#include <asm/unwind.h>
|
|
|
|
static int save_stack_address(struct stack_trace *trace, unsigned long addr,
|
|
bool nosched)
|
|
{
|
|
if (nosched && in_sched_functions(addr))
|
|
return 0;
|
|
|
|
if (trace->skip > 0) {
|
|
trace->skip--;
|
|
return 0;
|
|
}
|
|
|
|
if (trace->nr_entries >= trace->max_entries)
|
|
return -1;
|
|
|
|
trace->entries[trace->nr_entries++] = addr;
|
|
return 0;
|
|
}
|
|
|
|
static void __save_stack_trace(struct stack_trace *trace,
|
|
struct task_struct *task, struct pt_regs *regs,
|
|
bool nosched)
|
|
{
|
|
struct unwind_state state;
|
|
unsigned long addr;
|
|
|
|
if (regs)
|
|
save_stack_address(trace, regs->ip, nosched);
|
|
|
|
for (unwind_start(&state, task, regs, NULL); !unwind_done(&state);
|
|
unwind_next_frame(&state)) {
|
|
addr = unwind_get_return_address(&state);
|
|
if (!addr || save_stack_address(trace, addr, nosched))
|
|
break;
|
|
}
|
|
|
|
if (trace->nr_entries < trace->max_entries)
|
|
trace->entries[trace->nr_entries++] = ULONG_MAX;
|
|
}
|
|
|
|
/*
|
|
* Save stack-backtrace addresses into a stack_trace buffer.
|
|
*/
|
|
void save_stack_trace(struct stack_trace *trace)
|
|
{
|
|
__save_stack_trace(trace, current, NULL, false);
|
|
}
|
|
EXPORT_SYMBOL_GPL(save_stack_trace);
|
|
|
|
void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
|
|
{
|
|
__save_stack_trace(trace, current, regs, false);
|
|
}
|
|
|
|
void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
|
|
{
|
|
if (!try_get_task_stack(tsk))
|
|
return;
|
|
|
|
__save_stack_trace(trace, tsk, NULL, true);
|
|
|
|
put_task_stack(tsk);
|
|
}
|
|
EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
|
|
|
|
/* Userspace stacktrace - based on kernel/trace/trace_sysprof.c */
|
|
|
|
struct stack_frame_user {
|
|
const void __user *next_fp;
|
|
unsigned long ret_addr;
|
|
};
|
|
|
|
static int
|
|
copy_stack_frame(const void __user *fp, struct stack_frame_user *frame)
|
|
{
|
|
int ret;
|
|
|
|
if (!access_ok(VERIFY_READ, fp, sizeof(*frame)))
|
|
return 0;
|
|
|
|
ret = 1;
|
|
pagefault_disable();
|
|
if (__copy_from_user_inatomic(frame, fp, sizeof(*frame)))
|
|
ret = 0;
|
|
pagefault_enable();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline void __save_stack_trace_user(struct stack_trace *trace)
|
|
{
|
|
const struct pt_regs *regs = task_pt_regs(current);
|
|
const void __user *fp = (const void __user *)regs->bp;
|
|
|
|
if (trace->nr_entries < trace->max_entries)
|
|
trace->entries[trace->nr_entries++] = regs->ip;
|
|
|
|
while (trace->nr_entries < trace->max_entries) {
|
|
struct stack_frame_user frame;
|
|
|
|
frame.next_fp = NULL;
|
|
frame.ret_addr = 0;
|
|
if (!copy_stack_frame(fp, &frame))
|
|
break;
|
|
if ((unsigned long)fp < regs->sp)
|
|
break;
|
|
if (frame.ret_addr) {
|
|
trace->entries[trace->nr_entries++] =
|
|
frame.ret_addr;
|
|
}
|
|
if (fp == frame.next_fp)
|
|
break;
|
|
fp = frame.next_fp;
|
|
}
|
|
}
|
|
|
|
void save_stack_trace_user(struct stack_trace *trace)
|
|
{
|
|
/*
|
|
* Trace user stack if we are not a kernel thread
|
|
*/
|
|
if (current->mm) {
|
|
__save_stack_trace_user(trace);
|
|
}
|
|
if (trace->nr_entries < trace->max_entries)
|
|
trace->entries[trace->nr_entries++] = ULONG_MAX;
|
|
}
|
|
|