53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
#ifndef _ASM_STACKTRACE_H
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#define _ASM_STACKTRACE_H
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#include <asm/ptrace.h>
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#ifdef CONFIG_KALLSYMS
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extern int raw_show_trace;
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extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
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unsigned long pc, unsigned long *ra);
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extern unsigned long unwind_stack_by_address(unsigned long stack_page,
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unsigned long *sp,
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unsigned long pc,
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unsigned long *ra);
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#else
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#define raw_show_trace 1
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static inline unsigned long unwind_stack(struct task_struct *task,
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unsigned long *sp, unsigned long pc, unsigned long *ra)
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{
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return 0;
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}
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#endif
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static __always_inline void prepare_frametrace(struct pt_regs *regs)
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{
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#ifndef CONFIG_KALLSYMS
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/*
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* Remove any garbage that may be in regs (specially func
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* addresses) to avoid show_raw_backtrace() to report them
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*/
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memset(regs, 0, sizeof(*regs));
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#endif
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__asm__ __volatile__(
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".set push\n\t"
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".set noat\n\t"
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#ifdef CONFIG_64BIT
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"1: dla $1, 1b\n\t"
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"sd $1, %0\n\t"
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"sd $29, %1\n\t"
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"sd $31, %2\n\t"
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#else
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"1: la $1, 1b\n\t"
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"sw $1, %0\n\t"
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"sw $29, %1\n\t"
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"sw $31, %2\n\t"
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#endif
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".set pop\n\t"
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: "=m" (regs->cp0_epc),
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"=m" (regs->regs[29]), "=m" (regs->regs[31])
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: : "memory");
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}
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#endif /* _ASM_STACKTRACE_H */
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