| David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef _ASM_S390_STACKTRACE_H |
| 3 | #define _ASM_S390_STACKTRACE_H |
| 4 | |
| 5 | #include <linux/uaccess.h> |
| 6 | #include <linux/ptrace.h> |
| 7 | #include <asm/switch_to.h> |
| 8 | |
| 9 | enum stack_type { |
| 10 | STACK_TYPE_UNKNOWN, |
| 11 | STACK_TYPE_TASK, |
| 12 | STACK_TYPE_IRQ, |
| 13 | STACK_TYPE_NODAT, |
| 14 | STACK_TYPE_RESTART, |
| 15 | }; |
| 16 | |
| 17 | struct stack_info { |
| 18 | enum stack_type type; |
| 19 | unsigned long begin, end; |
| 20 | }; |
| 21 | |
| 22 | const char *stack_type_name(enum stack_type type); |
| 23 | int get_stack_info(unsigned long sp, struct task_struct *task, |
| 24 | struct stack_info *info, unsigned long *visit_mask); |
| 25 | |
| 26 | static inline bool on_stack(struct stack_info *info, |
| 27 | unsigned long addr, size_t len) |
| 28 | { |
| 29 | if (info->type == STACK_TYPE_UNKNOWN) |
| 30 | return false; |
| 31 | if (addr + len < addr) |
| 32 | return false; |
| 33 | return addr >= info->begin && addr + len <= info->end; |
| 34 | } |
| 35 | |
| 36 | static inline unsigned long get_stack_pointer(struct task_struct *task, |
| 37 | struct pt_regs *regs) |
| 38 | { |
| 39 | if (regs) |
| 40 | return (unsigned long) kernel_stack_pointer(regs); |
| 41 | if (task == current) |
| 42 | return current_stack_pointer(); |
| 43 | return (unsigned long) task->thread.ksp; |
| 44 | } |
| 45 | |
| 46 | /* |
| 47 | * Stack layout of a C stack frame. |
| 48 | */ |
| 49 | #ifndef __PACK_STACK |
| 50 | struct stack_frame { |
| 51 | unsigned long back_chain; |
| 52 | unsigned long empty1[5]; |
| 53 | unsigned long gprs[10]; |
| 54 | unsigned int empty2[8]; |
| 55 | }; |
| 56 | #else |
| 57 | struct stack_frame { |
| 58 | unsigned long empty1[5]; |
| 59 | unsigned int empty2[8]; |
| 60 | unsigned long gprs[10]; |
| 61 | unsigned long back_chain; |
| 62 | }; |
| 63 | #endif |
| 64 | |
| 65 | #define CALL_ARGS_0() \ |
| 66 | register unsigned long r2 asm("2") |
| 67 | #define CALL_ARGS_1(arg1) \ |
| 68 | register unsigned long r2 asm("2") = (unsigned long)(arg1) |
| 69 | #define CALL_ARGS_2(arg1, arg2) \ |
| 70 | CALL_ARGS_1(arg1); \ |
| 71 | register unsigned long r3 asm("3") = (unsigned long)(arg2) |
| 72 | #define CALL_ARGS_3(arg1, arg2, arg3) \ |
| 73 | CALL_ARGS_2(arg1, arg2); \ |
| 74 | register unsigned long r4 asm("4") = (unsigned long)(arg3) |
| 75 | #define CALL_ARGS_4(arg1, arg2, arg3, arg4) \ |
| 76 | CALL_ARGS_3(arg1, arg2, arg3); \ |
| 77 | register unsigned long r4 asm("5") = (unsigned long)(arg4) |
| 78 | #define CALL_ARGS_5(arg1, arg2, arg3, arg4, arg5) \ |
| 79 | CALL_ARGS_4(arg1, arg2, arg3, arg4); \ |
| 80 | register unsigned long r4 asm("6") = (unsigned long)(arg5) |
| 81 | |
| 82 | #define CALL_FMT_0 "=&d" (r2) : |
| 83 | #define CALL_FMT_1 "+&d" (r2) : |
| 84 | #define CALL_FMT_2 CALL_FMT_1 "d" (r3), |
| 85 | #define CALL_FMT_3 CALL_FMT_2 "d" (r4), |
| 86 | #define CALL_FMT_4 CALL_FMT_3 "d" (r5), |
| 87 | #define CALL_FMT_5 CALL_FMT_4 "d" (r6), |
| 88 | |
| 89 | #define CALL_CLOBBER_5 "0", "1", "14", "cc", "memory" |
| 90 | #define CALL_CLOBBER_4 CALL_CLOBBER_5 |
| 91 | #define CALL_CLOBBER_3 CALL_CLOBBER_4, "5" |
| 92 | #define CALL_CLOBBER_2 CALL_CLOBBER_3, "4" |
| 93 | #define CALL_CLOBBER_1 CALL_CLOBBER_2, "3" |
| 94 | #define CALL_CLOBBER_0 CALL_CLOBBER_1 |
| 95 | |
| 96 | #define CALL_ON_STACK(fn, stack, nr, args...) \ |
| 97 | ({ \ |
| 98 | CALL_ARGS_##nr(args); \ |
| 99 | unsigned long prev; \ |
| 100 | \ |
| 101 | asm volatile( \ |
| 102 | " la %[_prev],0(15)\n" \ |
| 103 | " la 15,0(%[_stack])\n" \ |
| 104 | " stg %[_prev],%[_bc](15)\n" \ |
| 105 | " brasl 14,%[_fn]\n" \ |
| 106 | " la 15,0(%[_prev])\n" \ |
| 107 | : [_prev] "=&a" (prev), CALL_FMT_##nr \ |
| 108 | [_stack] "a" (stack), \ |
| 109 | [_bc] "i" (offsetof(struct stack_frame, back_chain)), \ |
| 110 | [_fn] "X" (fn) : CALL_CLOBBER_##nr); \ |
| 111 | r2; \ |
| 112 | }) |
| 113 | |
| 114 | #endif /* _ASM_S390_STACKTRACE_H */ |