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52 lines
1.2 KiB
52 lines
1.2 KiB
#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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