/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_STACKTRACE_H
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#define _ASM_STACKTRACE_H
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#include <asm/ptrace.h>
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#include <asm/asm.h>
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#include <linux/stringify.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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#define STR_PTR_LA __stringify(PTR_LA)
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#define STR_LONG_S __stringify(LONG_S)
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#define STR_LONG_L __stringify(LONG_L)
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#define STR_LONGSIZE __stringify(LONGSIZE)
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#define STORE_ONE_REG(r) \
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STR_LONG_S " $" __stringify(r)",("STR_LONGSIZE"*"__stringify(r)")(%1)\n\t"
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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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/* Store $1 so we can use it */
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STR_LONG_S " $1,"STR_LONGSIZE"(%1)\n\t"
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/* Store the PC */
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"1: " STR_PTR_LA " $1, 1b\n\t"
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STR_LONG_S " $1,%0\n\t"
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STORE_ONE_REG(2)
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STORE_ONE_REG(3)
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STORE_ONE_REG(4)
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STORE_ONE_REG(5)
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STORE_ONE_REG(6)
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STORE_ONE_REG(7)
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STORE_ONE_REG(8)
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STORE_ONE_REG(9)
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STORE_ONE_REG(10)
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STORE_ONE_REG(11)
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STORE_ONE_REG(12)
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STORE_ONE_REG(13)
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STORE_ONE_REG(14)
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STORE_ONE_REG(15)
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STORE_ONE_REG(16)
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STORE_ONE_REG(17)
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STORE_ONE_REG(18)
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STORE_ONE_REG(19)
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STORE_ONE_REG(20)
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STORE_ONE_REG(21)
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STORE_ONE_REG(22)
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STORE_ONE_REG(23)
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STORE_ONE_REG(24)
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STORE_ONE_REG(25)
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STORE_ONE_REG(26)
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STORE_ONE_REG(27)
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STORE_ONE_REG(28)
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STORE_ONE_REG(29)
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STORE_ONE_REG(30)
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STORE_ONE_REG(31)
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/* Restore $1 */
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STR_LONG_L " $1,"STR_LONGSIZE"(%1)\n\t"
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".set pop\n\t"
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: "=m" (regs->cp0_epc)
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: "r" (regs->regs)
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: "memory");
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}
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#endif /* _ASM_STACKTRACE_H */
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