mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-15 14:56:47 +07:00
ec2ad9ccf1
Convert oprofile's x86_backtrace() to use the new unwinder. dump_trace() has been deprecated. Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Byungchul Park <byungchul.park@lge.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Nilay Vaish <nilayvaish@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Robert Richter <rric@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/412df8927705795e8ea60cffcf89a79e010713b1.1474045023.git.jpoimboe@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
128 lines
2.6 KiB
C
128 lines
2.6 KiB
C
/**
|
|
* @file backtrace.c
|
|
*
|
|
* @remark Copyright 2002 OProfile authors
|
|
* @remark Read the file COPYING
|
|
*
|
|
* @author John Levon
|
|
* @author David Smith
|
|
*/
|
|
|
|
#include <linux/oprofile.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/compat.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include <asm/ptrace.h>
|
|
#include <asm/stacktrace.h>
|
|
#include <asm/unwind.h>
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static struct stack_frame_ia32 *
|
|
dump_user_backtrace_32(struct stack_frame_ia32 *head)
|
|
{
|
|
/* Also check accessibility of one struct frame_head beyond: */
|
|
struct stack_frame_ia32 bufhead[2];
|
|
struct stack_frame_ia32 *fp;
|
|
unsigned long bytes;
|
|
|
|
bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead));
|
|
if (bytes != 0)
|
|
return NULL;
|
|
|
|
fp = (struct stack_frame_ia32 *) compat_ptr(bufhead[0].next_frame);
|
|
|
|
oprofile_add_trace(bufhead[0].return_address);
|
|
|
|
/* frame pointers should strictly progress back up the stack
|
|
* (towards higher addresses) */
|
|
if (head >= fp)
|
|
return NULL;
|
|
|
|
return fp;
|
|
}
|
|
|
|
static inline int
|
|
x86_backtrace_32(struct pt_regs * const regs, unsigned int depth)
|
|
{
|
|
struct stack_frame_ia32 *head;
|
|
|
|
/* User process is IA32 */
|
|
if (!current || !test_thread_flag(TIF_IA32))
|
|
return 0;
|
|
|
|
head = (struct stack_frame_ia32 *) regs->bp;
|
|
while (depth-- && head)
|
|
head = dump_user_backtrace_32(head);
|
|
|
|
return 1;
|
|
}
|
|
|
|
#else
|
|
static inline int
|
|
x86_backtrace_32(struct pt_regs * const regs, unsigned int depth)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
static struct stack_frame *dump_user_backtrace(struct stack_frame *head)
|
|
{
|
|
/* Also check accessibility of one struct frame_head beyond: */
|
|
struct stack_frame bufhead[2];
|
|
unsigned long bytes;
|
|
|
|
bytes = copy_from_user_nmi(bufhead, head, sizeof(bufhead));
|
|
if (bytes != 0)
|
|
return NULL;
|
|
|
|
oprofile_add_trace(bufhead[0].return_address);
|
|
|
|
/* frame pointers should strictly progress back up the stack
|
|
* (towards higher addresses) */
|
|
if (head >= bufhead[0].next_frame)
|
|
return NULL;
|
|
|
|
return bufhead[0].next_frame;
|
|
}
|
|
|
|
void
|
|
x86_backtrace(struct pt_regs * const regs, unsigned int depth)
|
|
{
|
|
struct stack_frame *head = (struct stack_frame *)frame_pointer(regs);
|
|
|
|
if (!user_mode(regs)) {
|
|
struct unwind_state state;
|
|
unsigned long addr;
|
|
|
|
if (!depth)
|
|
return;
|
|
|
|
oprofile_add_trace(regs->ip);
|
|
|
|
if (!--depth)
|
|
return;
|
|
|
|
for (unwind_start(&state, current, regs, NULL);
|
|
!unwind_done(&state); unwind_next_frame(&state)) {
|
|
addr = unwind_get_return_address(&state);
|
|
if (!addr)
|
|
break;
|
|
|
|
oprofile_add_trace(addr);
|
|
|
|
if (!--depth)
|
|
break;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
if (x86_backtrace_32(regs, depth))
|
|
return;
|
|
|
|
while (depth-- && head)
|
|
head = dump_user_backtrace(head);
|
|
}
|