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/* -*- linux-c -*-
* ppc64 stack tracing functions
*
* This file is part of systemtap, and is free software. You can
* redistribute it and/or modify it under the terms of the GNU General
* Public License (GPL); either version 2, or (at your option) any
* later version.
*/
static void __stp_stack_print (struct pt_regs *regs, int verbose, int levels,
struct task_struct *tsk, struct uretprobe_instance *ri)
{
unsigned long ip, newsp, lr = 0;
int count = 0;
int firstframe = 1;
unsigned long *_sp = (unsigned long *)®_SP(regs);
unsigned long sp = (unsigned long)_sp;
lr = 0;
do {
if (sp < KERNELBASE)
return;
_sp = (unsigned long *) sp;
newsp = _sp[0];
#ifndef STACK_FRAME_LR_SAVE /* from arch/powerpc/include/asm/ptrace.h */
#ifdef __powerpc64__
#define STACK_FRAME_OVERHEAD 112 /* size of minimum stack frame */
#define STACK_FRAME_LR_SAVE 2 /* Location of LR in stack frame */
#define STACK_FRAME_REGS_MARKER ASM_CONST(0x7265677368657265)
#define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD + 288)
#define STACK_FRAME_MARKER 12
#define __SIGNAL_FRAMESIZE 128
#define __SIGNAL_FRAMESIZE32 64
#else /* __powerpc64__ */
#define STACK_FRAME_OVERHEAD 16 /* size of minimum stack frame */
#define STACK_FRAME_LR_SAVE 1 /* Location of LR in stack frame */
#define STACK_FRAME_REGS_MARKER ASM_CONST(0x72656773)
#define STACK_INT_FRAME_SIZE (sizeof(struct pt_regs) + STACK_FRAME_OVERHEAD)
#define STACK_FRAME_MARKER 2
#define __SIGNAL_FRAMESIZE 64
#endif
#endif
ip = _sp[STACK_FRAME_LR_SAVE];
if (!firstframe || ip != lr) {
if (verbose) {
_stp_printf("[0x%016lx] [0x%016lx] ", sp, ip);
_stp_symbol_print(ip);
if (firstframe)
_stp_print(" (unreliable)");
_stp_print_char('\n');
}
else
_stp_printf("0x%016lx ", ip);
}
firstframe = 0;
/*
* See if this is an exception frame.
* We look for the "regshere" marker in the current frame.
*/
if (_sp[STACK_FRAME_MARKER] == STACK_FRAME_REGS_MARKER) {
struct pt_regs *regs = (struct pt_regs *)
(sp + STACK_FRAME_OVERHEAD);
if (verbose) {
_stp_printf("--- Exception: %lx at ",regs->trap);
_stp_symbol_print(regs->nip);
_stp_print_char('\n');
lr = regs->link;
_stp_print(" LR =");
_stp_symbol_print(lr);
_stp_print_char('\n');
firstframe = 1;
}
else {
_stp_printf("0x%016lx ",regs->nip);
_stp_printf("0x%016lx ",regs->link);
}
}
sp = newsp;
} while (count++ < MAXBACKTRACE);
}
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