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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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If the PC was ret_from_irq or ret_from_exception, there will be no more normal stackframe. Instead of stopping the unwinding, use PC and RA saved by an exception handler to continue unwinding into the interrupted context. This also simplifies the CONFIG_STACKTRACE code. Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
45 lines
982 B
C
45 lines
982 B
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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#else
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#define raw_show_trace 1
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#define unwind_stack(task, sp, pc, ra) 0
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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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