| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _ASM_STACKTRACE_H |
| 3 | #define _ASM_STACKTRACE_H |
| 4 | |
| 5 | #include <asm/ptrace.h> |
| 6 | #include <asm/asm.h> |
| 7 | #include <linux/stringify.h> |
| 8 | |
| 9 | #ifdef CONFIG_KALLSYMS |
| 10 | extern int raw_show_trace; |
| 11 | extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp, |
| 12 | unsigned long pc, unsigned long *ra); |
| 13 | extern unsigned long unwind_stack_by_address(unsigned long stack_page, |
| 14 | unsigned long *sp, |
| 15 | unsigned long pc, |
| 16 | unsigned long *ra); |
| 17 | #else |
| 18 | #define raw_show_trace 1 |
| 19 | static inline unsigned long unwind_stack(struct task_struct *task, |
| 20 | unsigned long *sp, unsigned long pc, unsigned long *ra) |
| 21 | { |
| 22 | return 0; |
| 23 | } |
| 24 | #endif |
| 25 | |
| 26 | #define STR_PTR_LA __stringify(PTR_LA) |
| 27 | #define STR_LONG_S __stringify(LONG_S) |
| 28 | #define STR_LONG_L __stringify(LONG_L) |
| 29 | #define STR_LONGSIZE __stringify(LONGSIZE) |
| 30 | |
| 31 | #define STORE_ONE_REG(r) \ |
| 32 | STR_LONG_S " $" __stringify(r)",("STR_LONGSIZE"*"__stringify(r)")(%1)\n\t" |
| 33 | |
| 34 | static __always_inline void prepare_frametrace(struct pt_regs *regs) |
| 35 | { |
| 36 | #ifndef CONFIG_KALLSYMS |
| 37 | /* |
| 38 | * Remove any garbage that may be in regs (specially func |
| 39 | * addresses) to avoid show_raw_backtrace() to report them |
| 40 | */ |
| 41 | memset(regs, 0, sizeof(*regs)); |
| 42 | #endif |
| 43 | __asm__ __volatile__( |
| 44 | ".set push\n\t" |
| 45 | ".set noat\n\t" |
| 46 | /* Store $1 so we can use it */ |
| 47 | STR_LONG_S " $1,"STR_LONGSIZE"(%1)\n\t" |
| 48 | /* Store the PC */ |
| 49 | "1: " STR_PTR_LA " $1, 1b\n\t" |
| 50 | STR_LONG_S " $1,%0\n\t" |
| 51 | STORE_ONE_REG(2) |
| 52 | STORE_ONE_REG(3) |
| 53 | STORE_ONE_REG(4) |
| 54 | STORE_ONE_REG(5) |
| 55 | STORE_ONE_REG(6) |
| 56 | STORE_ONE_REG(7) |
| 57 | STORE_ONE_REG(8) |
| 58 | STORE_ONE_REG(9) |
| 59 | STORE_ONE_REG(10) |
| 60 | STORE_ONE_REG(11) |
| 61 | STORE_ONE_REG(12) |
| 62 | STORE_ONE_REG(13) |
| 63 | STORE_ONE_REG(14) |
| 64 | STORE_ONE_REG(15) |
| 65 | STORE_ONE_REG(16) |
| 66 | STORE_ONE_REG(17) |
| 67 | STORE_ONE_REG(18) |
| 68 | STORE_ONE_REG(19) |
| 69 | STORE_ONE_REG(20) |
| 70 | STORE_ONE_REG(21) |
| 71 | STORE_ONE_REG(22) |
| 72 | STORE_ONE_REG(23) |
| 73 | STORE_ONE_REG(24) |
| 74 | STORE_ONE_REG(25) |
| 75 | STORE_ONE_REG(26) |
| 76 | STORE_ONE_REG(27) |
| 77 | STORE_ONE_REG(28) |
| 78 | STORE_ONE_REG(29) |
| 79 | STORE_ONE_REG(30) |
| 80 | STORE_ONE_REG(31) |
| 81 | /* Restore $1 */ |
| 82 | STR_LONG_L " $1,"STR_LONGSIZE"(%1)\n\t" |
| 83 | ".set pop\n\t" |
| 84 | : "=m" (regs->cp0_epc) |
| 85 | : "r" (regs->regs) |
| 86 | : "memory"); |
| 87 | } |
| 88 | |
| 89 | #endif /* _ASM_STACKTRACE_H */ |