| /* 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 */ |
