| /* SPDX-License-Identifier: GPL-2.0 */ | |
| #ifndef _ASM_STACKTRACE_H | |
| #define _ASM_STACKTRACE_H | |
| #include <asm/ptrace.h> | |
| #include <asm/asm.h> | |
| #include <linux/stringify.h> | |
| #ifdef CONFIG_KALLSYMS | |
| extern int raw_show_trace; | |
| extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp, | |
| unsigned long pc, unsigned long *ra); | |
| extern unsigned long unwind_stack_by_address(unsigned long stack_page, | |
| unsigned long *sp, | |
| unsigned long pc, | |
| unsigned long *ra); | |
| #else | |
| #define raw_show_trace 1 | |
| static inline unsigned long unwind_stack(struct task_struct *task, | |
| unsigned long *sp, unsigned long pc, unsigned long *ra) | |
| { | |
| return 0; | |
| } | |
| #endif | |
| #define STR_PTR_LA __stringify(PTR_LA) | |
| #define STR_LONG_S __stringify(LONG_S) | |
| #define STR_LONG_L __stringify(LONG_L) | |
| #define STR_LONGSIZE __stringify(LONGSIZE) | |
| #define STORE_ONE_REG(r) \ | |
| STR_LONG_S " $" __stringify(r)",("STR_LONGSIZE"*"__stringify(r)")(%1)\n\t" | |
| static __always_inline void prepare_frametrace(struct pt_regs *regs) | |
| { | |
| #ifndef CONFIG_KALLSYMS | |
| /* | |
| * Remove any garbage that may be in regs (specially func | |
| * addresses) to avoid show_raw_backtrace() to report them | |
| */ | |
| memset(regs, 0, sizeof(*regs)); | |
| #endif | |
| __asm__ __volatile__( | |
| ".set push\n\t" | |
| ".set noat\n\t" | |
| /* Store $1 so we can use it */ | |
| STR_LONG_S " $1,"STR_LONGSIZE"(%1)\n\t" | |
| /* Store the PC */ | |
| "1: " STR_PTR_LA " $1, 1b\n\t" | |
| STR_LONG_S " $1,%0\n\t" | |
| STORE_ONE_REG(2) | |
| STORE_ONE_REG(3) | |
| STORE_ONE_REG(4) | |
| STORE_ONE_REG(5) | |
| STORE_ONE_REG(6) | |
| STORE_ONE_REG(7) | |
| STORE_ONE_REG(8) | |
| STORE_ONE_REG(9) | |
| STORE_ONE_REG(10) | |
| STORE_ONE_REG(11) | |
| STORE_ONE_REG(12) | |
| STORE_ONE_REG(13) | |
| STORE_ONE_REG(14) | |
| STORE_ONE_REG(15) | |
| STORE_ONE_REG(16) | |
| STORE_ONE_REG(17) | |
| STORE_ONE_REG(18) | |
| STORE_ONE_REG(19) | |
| STORE_ONE_REG(20) | |
| STORE_ONE_REG(21) | |
| STORE_ONE_REG(22) | |
| STORE_ONE_REG(23) | |
| STORE_ONE_REG(24) | |
| STORE_ONE_REG(25) | |
| STORE_ONE_REG(26) | |
| STORE_ONE_REG(27) | |
| STORE_ONE_REG(28) | |
| STORE_ONE_REG(29) | |
| STORE_ONE_REG(30) | |
| STORE_ONE_REG(31) | |
| /* Restore $1 */ | |
| STR_LONG_L " $1,"STR_LONGSIZE"(%1)\n\t" | |
| ".set pop\n\t" | |
| : "=m" (regs->cp0_epc) | |
| : "r" (regs->regs) | |
| : "memory"); | |
| } | |
| #endif /* _ASM_STACKTRACE_H */ |