| 1 | #ifndef _ASM_STACKTRACE_H
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| 2 | #define _ASM_STACKTRACE_H
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| 3 |
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| 4 | #include <asm/ptrace.h>
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| 5 |
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| 6 | #ifdef CONFIG_KALLSYMS
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| 7 | extern int raw_show_trace;
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| 8 | extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
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| 9 | unsigned long pc, unsigned long *ra);
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| 10 | #else
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| 11 | #define raw_show_trace 1
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| 12 | static inline unsigned long unwind_stack(struct task_struct *task,
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| 13 | unsigned long *sp, unsigned long pc, unsigned long *ra)
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| 14 | {
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| 15 | return 0;
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| 16 | }
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| 17 | #endif
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| 18 |
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| 19 | static __always_inline void prepare_frametrace(struct pt_regs *regs)
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| 20 | {
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| 21 | #ifndef CONFIG_KALLSYMS
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| 22 | |
| 23 | * Remove any garbage that may be in regs (specially func
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| 24 | * addresses) to avoid show_raw_backtrace() to report them
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| 25 |
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| 26 | memset(regs, 0, sizeof(*regs));
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| 27 | #endif
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| 28 | __asm__ __volatile__(
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| 29 | ".set push\n\t"
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| 30 | ".set noat\n\t"
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| 31 | #ifdef CONFIG_64BIT
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| 32 | "1: dla $1, 1b\n\t"
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| 33 | "sd $1, %0\n\t"
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| 34 | "sd $29, %1\n\t"
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| 35 | "sd $31, %2\n\t"
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| 36 | #else
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| 37 | "1: la $1, 1b\n\t"
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| 38 | "sw $1, %0\n\t"
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| 39 | "sw $29, %1\n\t"
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| 40 | "sw $31, %2\n\t"
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| 41 | #endif
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| 42 | ".set pop\n\t"
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| 43 | : "=m" (regs->cp0_epc),
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| 44 | "=m" (regs->regs[29]), "=m" (regs->regs[31])
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| 45 | : : "memory");
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| 46 | }
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| 47 |
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| 48 | #endif
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