Mercurial > pub > dyncall > dyncall
comparison doc/disas_examples/arm.armhf.disas @ 327:c0390dc85a07
- doc: added disassembly examples for many platforms and calling conventions, for reference
| author | Tassilo Philipp |
|---|---|
| date | Fri, 22 Nov 2019 23:08:59 +0100 |
| parents | |
| children | 0fc22b5feac7 |
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| 326:09aaa2e774cd | 327:c0390dc85a07 |
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| 1 ; #include <stdlib.h> | |
| 2 ; | |
| 3 ; void leaf_call(int b, int c, int d, int e, int f, int g, int h) | |
| 4 ; { | |
| 5 ; } | |
| 6 ; | |
| 7 ; void nonleaf_call(int a, int b, int c, int d, int e, int f, int g, int h) | |
| 8 ; { | |
| 9 ; /* use some local data */ | |
| 10 ; *(char*)alloca(220) = 'L'; | |
| 11 ; leaf_call(b, c, d, e, f, g, h); | |
| 12 ; } | |
| 13 ; | |
| 14 ; int main() | |
| 15 ; { | |
| 16 ; nonleaf_call(0, 1, 2, 3, 4, 5, 6, 7); | |
| 17 ; return 0; | |
| 18 ; } | |
| 19 | |
| 20 | |
| 21 | |
| 22 ; output from raspbian-wheezy_20120715-raspberrypi w/ gcc 4.6.3 | |
| 23 ; note: this is arm mode, -mthumb says "sorry, unimplemented: Thumb-1 hard-float VFP ABI" (however, -msoft-float -mthumb is supported) | |
| 24 ; not sure about thumb-2 as there is no flag for it, but I don't think this exists if using the VFP | |
| 25 | |
| 26 00000000 <leaf_call>: | |
| 27 0: e52db004 push {fp} ; (str fp, [sp, #-4]!) | |
| 28 4: e28db000 add fp, sp, #0 | |
| 29 8: e24dd014 sub sp, sp, #20 | |
| 30 c: e50b0008 str r0, [fp, #-8] | |
| 31 10: e50b100c str r1, [fp, #-12] | |
| 32 14: e50b2010 str r2, [fp, #-16] | |
| 33 18: e50b3014 str r3, [fp, #-20] | |
| 34 1c: e28bd000 add sp, fp, #0 | |
| 35 20: e8bd0800 pop {fp} | |
| 36 24: e12fff1e bx lr | |
| 37 | |
| 38 00000028 <nonleaf_call>: | |
| 39 ;spill here, if needed: push {r0, r1, r2, r3} ; | just for ref, if present this would change below offsets | |
| 40 28: e92d4800 push {fp, lr} ; | | |
| 41 2c: e28db004 add fp, sp, #4 ; | prolog | |
| 42 30: e24dd020 sub sp, sp, #32 ; | | |
| 43 34: e50b0008 str r0, [fp, #-8] ; in arg 0 -> temp space in local area | |
| 44 38: e50b100c str r1, [fp, #-12] ; in arg 1 -> temp space in local area | |
| 45 3c: e50b2010 str r2, [fp, #-16] ; in arg 2 -> temp space in local area | |
| 46 40: e50b3014 str r3, [fp, #-20] ; in arg 3 -> temp space in local area | |
| 47 44: e24dd0e8 sub sp, sp, #232 ; alloca(220) - with padding to guarantee alignment | |
| 48 48: e28d3010 add r3, sp, #16 ; | | |
| 49 4c: e2833007 add r3, r3, #7 ; | | |
| 50 50: e1a031a3 lsr r3, r3, #3 ; | start of (aligned) alloca()'d memory -> r3, leaving room at top of stack for param area | |
| 51 54: e1a03183 lsl r3, r3, #3 ; | | |
| 52 58: e3a0204c mov r2, #76 ; 'L' -> r2, and ... | |
| 53 5c: e5c32000 strb r2, [r3] ; ... store in local area (of alloca()'d space) | |
| 54 60: e59b3008 ldr r3, [fp, #8] ; arg 4 (fetched from prev frame's param area), and ... | |
| 55 64: e58d3000 str r3, [sp] ; ... "pushed" onto stack | |
| 56 68: e59b300c ldr r3, [fp, #12] ; arg 5 (fetched from prev frame's param area), and ... | |
| 57 6c: e58d3004 str r3, [sp, #4] ; ... "pushed" onto stack | |
| 58 70: e59b3010 ldr r3, [fp, #16] ; arg 6 (fetched from prev frame's param area), and ... | |
| 59 74: e58d3008 str r3, [sp, #8] ; ... "pushed" onto stack | |
| 60 78: e51b000c ldr r0, [fp, #-12] ; arg 0 | |
| 61 7c: e51b1010 ldr r1, [fp, #-16] ; arg 1 | |
| 62 80: e51b2014 ldr r2, [fp, #-20] ; arg 2 | |
| 63 84: e59b3004 ldr r3, [fp, #4] ; arg 3 (fetched from prev frame's param area) | |
| 64 88: ebfffffe bl 0 <leaf_call> ; return address -> r14/lr, and call | |
| 65 8c: e24bd004 sub sp, fp, #4 ; | | |
| 66 90: e8bd8800 pop {fp, pc} ; | epilog | |
| 67 | |
| 68 00000094 <main>: | |
| 69 94: e92d4800 push {fp, lr} ; | | |
| 70 98: e28db004 add fp, sp, #4 ; | prolog | |
| 71 9c: e24dd010 sub sp, sp, #16 ; | | |
| 72 a0: e3a03004 mov r3, #4 ; arg 4, and ... | |
| 73 a4: e58d3000 str r3, [sp] ; ... "pushed" onto stack | |
| 74 a8: e3a03005 mov r3, #5 ; arg 5, and ... | |
| 75 ac: e58d3004 str r3, [sp, #4] ; ... "pushed" onto stack | |
| 76 b0: e3a03006 mov r3, #6 ; arg 6, and ... | |
| 77 b4: e58d3008 str r3, [sp, #8] ; ... "pushed" onto stack | |
| 78 b8: e3a03007 mov r3, #7 ; arg 7, and ... | |
| 79 bc: e58d300c str r3, [sp, #12] ; ... "pushed" onto stack | |
| 80 c0: e3a00000 mov r0, #0 ; arg 0 | |
| 81 c4: e3a01001 mov r1, #1 ; arg 1 | |
| 82 c8: e3a02002 mov r2, #2 ; arg 2 | |
| 83 cc: e3a03003 mov r3, #3 ; arg 3 | |
| 84 d0: ebfffffe bl 28 <nonleaf_call> ; return address -> r14/lr, and call | |
| 85 d4: e3a03000 mov r3, #0 ; return value (0) via r3 ... (a bit unoptimal) | |
| 86 d8: e1a00003 mov r0, r3 ; ... to r0 | |
| 87 dc: e24bd004 sub sp, fp, #4 ; | | |
| 88 e0: e8bd8800 pop {fp, pc} ; | epilog | |
| 89 | |
| 90 ; vim: ft=asm68k | |
| 91 |