projects / deliverable / binutils-gdb.git / blame
| Commit | Line | Data |
|---|---|---|
| 88b9d363 | 1 | /* Copyright 2020-2022 Free Software Foundation, Inc. |
| 22b9b4b0 SL |
2 | |
| 3 | This program is free software; you can redistribute it and/or modify | |
| 4 | it under the terms of the GNU General Public License as published by | |
| 5 | the Free Software Foundation; either version 3 of the License, or | |
| 6 | (at your option) any later version. | |
| 7 | ||
| 8 | This program is distributed in the hope that it will be useful, | |
| 9 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 11 | GNU General Public License for more details. | |
| 12 | ||
| 13 | You should have received a copy of the GNU General Public License | |
| 14 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
| 15 | ||
| 16 | #include <asm/unistd.h> | |
| 17 | ||
| 18 | /* Define these for each architecture: | |
| 19 | ||
| 20 | 1) RETURN_ADDRESS_REGNO: The register number representing the return | |
| 21 | address in the DWARF CFI. It can be easily be looked up using | |
| 22 | `readelf --debug-dump=frames-interp` on an existing binary of that | |
| 23 | architecture, where it says `ra=X`. | |
| 24 | ||
| 25 | 2) exit_0: a sequence of instruction to execute the exit syscall with | |
| 26 | argument 0. */ | |
| 27 | ||
| 28 | #if defined(__x86_64__) | |
| 29 | ||
| 30 | # define RETURN_ADDRESS_REGNO 16 | |
| 31 | ||
| 32 | .macro exit_0 | |
| 33 | mov $__NR_exit, %rax | |
| 34 | mov $0, %rdi | |
| 35 | syscall | |
| 36 | .endm | |
| 37 | ||
| 38 | #elif defined(__i386__) | |
| 39 | ||
| 40 | # define RETURN_ADDRESS_REGNO 8 | |
| 41 | ||
| 42 | .macro exit_0 | |
| 43 | mov $__NR_exit, %eax | |
| 44 | mov $0, %ebx | |
| 45 | int $0x80 | |
| 46 | .endm | |
| 47 | ||
| 48 | #elif defined(__aarch64__) | |
| 49 | ||
| 50 | # define RETURN_ADDRESS_REGNO 30 | |
| 51 | ||
| 52 | .macro exit_0 | |
| 53 | mov x0, #0 | |
| 54 | mov x8, #__NR_exit | |
| 55 | svc #0 | |
| 56 | .endm | |
| 57 | ||
| 58 | #elif defined(__arm__) | |
| 59 | ||
| 60 | # define RETURN_ADDRESS_REGNO 14 | |
| 61 | ||
| 62 | .macro exit_0 | |
| 63 | ldr r7, =__NR_exit | |
| 64 | ldr r0, =0 | |
| 65 | swi 0x0 | |
| 66 | .endm | |
| 67 | ||
| 68 | #else | |
| 69 | # error "Unsupported architecture" | |
| 70 | #endif | |
| 71 | ||
| 72 | /* The following assembly program mimics this pseudo C program, where | |
| 73 | everything has been inlined: | |
| 74 | ||
| 75 | 1 void bar(void) { | |
| 76 | 2 nop; | |
| 77 | 3 } | |
| 78 | 4 | |
| 79 | 5 void foo(void) { | |
| 80 | 6 nop; | |
| 81 | 7 bar(); | |
| 82 | 8 nop; | |
| 83 | 9 } | |
| 84 | 10 | |
| 85 | 11 void _start(void) { | |
| 86 | 12 nop; | |
| 87 | 13 foo(); | |
| 88 | 14 nop; | |
| 89 | 15 exit(0); | |
| 90 | 16 } | |
| 91 | */ | |
| 92 | ||
| 93 | .global _start | |
| 94 | _start: | |
| 95 | .cfi_startproc | |
| 96 | ||
| 97 | /* State that the return address for this frame is undefined. */ | |
| 98 | .cfi_undefined RETURN_ADDRESS_REGNO | |
| 99 | ||
| 100 | .global __cu_low_pc | |
| 101 | __cu_low_pc: | |
| 102 | ||
| 103 | .global __start_low_pc | |
| 104 | __start_low_pc: | |
| 105 | /* Line 12 */ | |
| 106 | nop | |
| 107 | ||
| 108 | .global __foo_low_pc | |
| 109 | __foo_low_pc: | |
| 110 | /* Line 6 */ | |
| 111 | nop | |
| 112 | ||
| 113 | .global __bar_low_pc | |
| 114 | __bar_low_pc: | |
| 115 | /* Line 2 */ | |
| 116 | nop | |
| 117 | ||
| 118 | .global __bar_high_pc | |
| 119 | __bar_high_pc: | |
| 120 | /* Line 8 */ | |
| 121 | nop | |
| 122 | ||
| 123 | .global __foo_high_pc | |
| 124 | __foo_high_pc: | |
| 125 | /* Line 14 */ | |
| 126 | nop | |
| 127 | ||
| 128 | /* Line 15 */ | |
| 129 | exit_0 | |
| 130 | ||
| 131 | .cfi_endproc | |
| 132 | ||
| 133 | .global __start_high_pc | |
| 134 | __start_high_pc: | |
| 135 | ||
| 136 | .global __cu_high_pc | |
| 137 | __cu_high_pc: |