| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame^] | 1 | .file "initfini.c" |
| 2 | |
| 3 | #include <bits/arm_asm.h> |
| 4 | .section .init |
| 5 | .global _init |
| 6 | .type _init, %function |
| 7 | #if defined __thumb__ |
| 8 | .align 1 |
| 9 | .thumb |
| 10 | .thumb_func |
| 11 | _init: |
| 12 | push {r4-r7, lr} |
| 13 | #else |
| 14 | .align 2 |
| 15 | .arm |
| 16 | _init: |
| 17 | @ gcc 3.3.2 didn't create a stack frame, gcc 3.4.4 does - |
| 18 | @ presumably 3.4.4 can put stuff into .init which requires |
| 19 | @ the arguments to be saved. This code is copied from 3.4.4 |
| 20 | mov ip, sp |
| 21 | stmdb sp!, {r4, r5, r6, r7, r8, r9, sl, fp, ip, lr, pc} |
| 22 | sub fp, ip, #4 |
| 23 | #endif |
| 24 | |
| 25 | |
| 26 | .section .fini |
| 27 | .global _fini |
| 28 | .type _fini, %function |
| 29 | #if defined __thumb__ |
| 30 | .align 1 |
| 31 | .thumb |
| 32 | .thumb_func |
| 33 | _fini: |
| 34 | push {r4-r7, lr} |
| 35 | #else |
| 36 | .align 2 |
| 37 | .arm |
| 38 | _fini: |
| 39 | mov ip, sp |
| 40 | stmdb sp!, {r4, r5, r6, r7, r8, r9, sl, fp, ip, lr, pc} |
| 41 | sub fp, ip, #4 |
| 42 | #endif |
| 43 | |
| 44 | |
| 45 | #if (defined __thumb__ || defined __THUMB_INTERWORK__) && (defined __ARM_ARCH_4T__ || defined __ARM_ARCH_5T__ || defined __ARM_ARCH_5TE__) |
| 46 | @ To support thumb code it is currently necessary to have the _call_via_rX |
| 47 | @ functions exposed to the linker for any program or shared library. PLT |
| 48 | @ references are inadequate - the PLT zaps ip and therefore breaks _call_via_ip |
| 49 | @ (and the compiler does generate this). It is simpler to put all the |
| 50 | @ required code in here - it only amounts to 60 bytes overhead. |
| 51 | @NOTE: it would be better to have the compiler generate this stuff as |
| 52 | @ required... |
| 53 | .section ".text" |
| 54 | .align 0 |
| 55 | .force_thumb |
| 56 | |
| 57 | .macro call_via register |
| 58 | .global _call_via_\register |
| 59 | .type _call_via_\register, %function |
| 60 | .weak _call_via_\register |
| 61 | .hidden _call_via_\register |
| 62 | .thumb_func |
| 63 | _call_via_\register: |
| 64 | bx \register |
| 65 | nop |
| 66 | .size _call_via_\register, . - _call_via_\register |
| 67 | .endm |
| 68 | |
| 69 | @ and calls for the 15 general purpose registers (2 bytes each). |
| 70 | call_via r0 |
| 71 | call_via r1 |
| 72 | call_via r2 |
| 73 | call_via r3 |
| 74 | call_via r4 |
| 75 | call_via r5 |
| 76 | call_via r6 |
| 77 | call_via r7 |
| 78 | call_via r8 |
| 79 | call_via r9 |
| 80 | call_via sl |
| 81 | call_via fp |
| 82 | call_via ip |
| 83 | call_via sp |
| 84 | call_via lr |
| 85 | #endif |
| 86 | |
| 87 | .ident "GCC: (GNU) 3.3.2 20031005 (Debian prerelease)" |