Contributors: 10
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Brian Rogan |
375 |
91.91% |
1 |
9.09% |
| Al Viro |
14 |
3.43% |
1 |
9.09% |
| Christophe Leroy |
5 |
1.23% |
1 |
9.09% |
| Anton Blanchard |
3 |
0.74% |
1 |
9.09% |
| Thomas Gleixner |
2 |
0.49% |
1 |
9.09% |
| Christoph Hellwig |
2 |
0.49% |
1 |
9.09% |
| Denis Kirjanov |
2 |
0.49% |
1 |
9.09% |
| Arnd Bergmann |
2 |
0.49% |
2 |
18.18% |
| Deepa Dinamani |
2 |
0.49% |
1 |
9.09% |
| Jiang Lu |
1 |
0.25% |
1 |
9.09% |
| Total |
408 |
|
11 |
|
// SPDX-License-Identifier: GPL-2.0-or-later
/**
* Copyright (C) 2005 Brian Rogan <bcr6@cornell.edu>, IBM
*
**/
#include <linux/time.h>
#include <linux/oprofile.h>
#include <linux/sched.h>
#include <asm/processor.h>
#include <linux/uaccess.h>
#include <linux/compat.h>
#include <asm/oprofile_impl.h>
#define STACK_SP(STACK) *(STACK)
#define STACK_LR64(STACK) *((unsigned long *)(STACK) + 2)
#define STACK_LR32(STACK) *((unsigned int *)(STACK) + 1)
#ifdef CONFIG_PPC64
#define STACK_LR(STACK) STACK_LR64(STACK)
#else
#define STACK_LR(STACK) STACK_LR32(STACK)
#endif
static unsigned int user_getsp32(unsigned int sp, int is_first)
{
unsigned int stack_frame[2];
void __user *p = compat_ptr(sp);
/*
* The most likely reason for this is that we returned -EFAULT,
* which means that we've done all that we can do from
* interrupt context.
*/
if (copy_from_user_nofault(stack_frame, (void __user *)p,
sizeof(stack_frame)))
return 0;
if (!is_first)
oprofile_add_trace(STACK_LR32(stack_frame));
/*
* We do not enforce increasing stack addresses here because
* we may transition to a different stack, eg a signal handler.
*/
return STACK_SP(stack_frame);
}
#ifdef CONFIG_PPC64
static unsigned long user_getsp64(unsigned long sp, int is_first)
{
unsigned long stack_frame[3];
if (copy_from_user_nofault(stack_frame, (void __user *)sp,
sizeof(stack_frame)))
return 0;
if (!is_first)
oprofile_add_trace(STACK_LR64(stack_frame));
return STACK_SP(stack_frame);
}
#endif
static unsigned long kernel_getsp(unsigned long sp, int is_first)
{
unsigned long *stack_frame = (unsigned long *)sp;
if (!validate_sp(sp, current, STACK_FRAME_OVERHEAD))
return 0;
if (!is_first)
oprofile_add_trace(STACK_LR(stack_frame));
/*
* We do not enforce increasing stack addresses here because
* we might be transitioning from an interrupt stack to a kernel
* stack. validate_sp() is designed to understand this, so just
* use it.
*/
return STACK_SP(stack_frame);
}
void op_powerpc_backtrace(struct pt_regs * const regs, unsigned int depth)
{
unsigned long sp = regs->gpr[1];
int first_frame = 1;
/* We ditch the top stackframe so need to loop through an extra time */
depth += 1;
if (!user_mode(regs)) {
while (depth--) {
sp = kernel_getsp(sp, first_frame);
if (!sp)
break;
first_frame = 0;
}
} else {
#ifdef CONFIG_PPC64
if (!is_32bit_task()) {
while (depth--) {
sp = user_getsp64(sp, first_frame);
if (!sp)
break;
first_frame = 0;
}
return;
}
#endif
while (depth--) {
sp = user_getsp32(sp, first_frame);
if (!sp)
break;
first_frame = 0;
}
}
}