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view doc/disas_examples/arm.atpcs_arm.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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; #include <stdlib.h> ; ; void leaf_call(int b, int c, int d, int e, int f, int g, int h) ; { ; } ; ; void nonleaf_call(int a, int b, int c, int d, int e, int f, int g, int h) ; { ; /* use some local data */ ; *(char*)alloca(220) = 'L'; ; leaf_call(b, c, d, e, f, g, h); ; } ; ; int main() ; { ; nonleaf_call(0, 1, 2, 3, 4, 5, 6, 7); ; return 0; ; } ; output from netbsd-4.0.1-cats w/ gcc 4.1.2 00000000 <leaf_call>: 0: e1a0c00d mov ip, sp 4: e92dd800 stmdb sp!, {fp, ip, lr, pc} 8: e24cb004 sub fp, ip, #4 ; 0x4 c: e24dd010 sub sp, sp, #16 ; 0x10 10: e50b0010 str r0, [fp, #-16] 14: e50b1014 str r1, [fp, #-20] 18: e50b2018 str r2, [fp, #-24] 1c: e50b301c str r3, [fp, #-28] 20: e24bd00c sub sp, fp, #12 ; 0xc 24: e89da800 ldmia sp, {fp, sp, pc} 00000028 <nonleaf_call>: 28: e1a0c00d mov ip, sp ; | ;spill here, if needed: stmdb sp!, {r0, r1, r2, r3} ; | just for ref, if present this would change below offsets 2c: e92dd800 stmdb sp!, {fp, ip, lr, pc} ; | 30: e24cb004 sub fp, ip, #4 ; | prolog 34: e24dd020 sub sp, sp, #32 ; | 38: e50b0010 str r0, [fp, #-16] ; in arg 0 -> temp space in local area 3c: e50b1014 str r1, [fp, #-20] ; in arg 1 -> temp space in local area 40: e50b2018 str r2, [fp, #-24] ; in arg 2 -> temp space in local area 44: e50b301c str r3, [fp, #-28] ; in arg 3 -> temp space in local area 48: e24dd0e0 sub sp, sp, #224 ; alloca(220) - with padding to guarantee alignment 4c: e28d200c add r2, sp, #12 ; | 50: e50b2020 str r2, [fp, #-32] ; | @@@ pointless push of r2 to local area to put it back ... 54: e51b2020 ldr r2, [fp, #-32] ; | @@@ ... into r2 58: e2823003 add r3, r2, #3 ; | start of (aligned) alloca()'d memory -> r3, leaving room at top of stack for param area 5c: e1a03123 mov r3, r3, lsr #2 ; | 60: e1a03103 mov r3, r3, lsl #2 ; / 64: e50b3020 str r3, [fp, #-32] ; \ 68: e51b2020 ldr r2, [fp, #-32] ; | r2 -> r3, to free r2 (kinda pointless as followup code could use r2 and r3 the other way round) 6c: e3a0304c mov r3, #76 ; 'L' -> r3, and ... 70: e5c23000 strb r3, [r2] ; ... store in local area (of alloca()'d space) 74: e59b3008 ldr r3, [fp, #8] ; arg 4 (fetched from prev frame's param area), and ... 78: e58d3000 str r3, [sp] ; ... "pushed" onto stack 7c: e59b300c ldr r3, [fp, #12] ; arg 5 (fetched from prev frame's param area), and ... 80: e58d3004 str r3, [sp, #4] ; ... "pushed" onto stack 84: e59b3010 ldr r3, [fp, #16] ; arg 6 (fetched from prev frame's param area), and ... 88: e58d3008 str r3, [sp, #8] ; ... "pushed" onto stack 8c: e51b0014 ldr r0, [fp, #-20] ; arg 0 90: e51b1018 ldr r1, [fp, #-24] ; arg 1 94: e51b201c ldr r2, [fp, #-28] ; arg 2 98: e59b3004 ldr r3, [fp, #4] ; arg 3 (fetched from prev frame's param area) 9c: ebfffffe bl 9c <nonleaf_call+0x74> ; return address -> r14/lr, and call a0: e24bd00c sub sp, fp, #12 ; | a4: e89da800 ldmia sp, {fp, sp, pc} ; | epilog 000000a8 <main>: a8: e1a0c00d mov ip, sp ; | ac: e92dd800 stmdb sp!, {fp, ip, lr, pc} ; | b0: e24cb004 sub fp, ip, #4 ; | prolog b4: e24dd010 sub sp, sp, #16 ; | b8: e3a03004 mov r3, #4 ; arg 4, and ... bc: e58d3000 str r3, [sp] ; ... "pushed" onto stack c0: e3a03005 mov r3, #5 ; arg 5, and ... c4: e58d3004 str r3, [sp, #4] ; ... "pushed" onto stack c8: e3a03006 mov r3, #6 ; arg 6, and ... cc: e58d3008 str r3, [sp, #8] ; ... "pushed" onto stack d0: e3a03007 mov r3, #7 ; arg 7, and ... d4: e58d300c str r3, [sp, #12] ; ... "pushed" onto stack d8: e3a00000 mov r0, #0 ; arg 0 dc: e3a01001 mov r1, #1 ; arg 1 e0: e3a02002 mov r2, #2 ; arg 2 e4: e3a03003 mov r3, #3 ; arg 3 e8: ebfffffe bl e8 <main+0x40> ; return address -> r14/lr, and call ec: e3a03000 mov r3, #0 ; return value via r3, ... (a bit unoptimal) f0: e1a00003 mov r0, r3 ; ... to r0 f4: e24bd00c sub sp, fp, #12 ; | f8: e89da800 ldmia sp, {fp, sp, pc} ; | epilog ; output from freebsd-11.0_r260099-raspberrypi w/ clang 3.3 00000000 <leaf_call>: 0: e24dd030 sub sp, sp, #48 ; 0x30 4: e58d002c str r0, [sp, #44] 8: e58d1028 str r1, [sp, #40] c: e58d2024 str r2, [sp, #36] 10: e58d3020 str r3, [sp, #32] 14: e59dc030 ldr ip, [sp, #48] 18: e58dc01c str ip, [sp, #28] 1c: e59dc034 ldr ip, [sp, #52] 20: e58dc018 str ip, [sp, #24] 24: e59dc038 ldr ip, [sp, #56] 28: e58dc014 str ip, [sp, #20] 2c: e58d1010 str r1, [sp, #16] 30: e58d300c str r3, [sp, #12] 34: e58d2008 str r2, [sp, #8] 38: e58d0004 str r0, [sp, #4] 3c: e28dd030 add sp, sp, #48 ; 0x30 40: e12fff1e bx lr 00000044 <nonleaf_call>: 44: e92d4bf0 push {r4, r5, r6, r7, r8, r9, fp, lr} 48: e28db018 add fp, sp, #24 ; 0x18 4c: e24ddf4a sub sp, sp, #296 ; 0x128 50: e50b001c str r0, [fp, #-28] 54: e50b1020 str r1, [fp, #-32] 58: e50b2024 str r2, [fp, #-36] 5c: e50b3028 str r3, [fp, #-40] 60: e59bc008 ldr ip, [fp, #8] 64: e50bc02c str ip, [fp, #-44] 68: e59bc00c ldr ip, [fp, #12] 6c: e50bc030 str ip, [fp, #-48] 70: e59bc010 ldr ip, [fp, #16] 74: e50bc034 str ip, [fp, #-52] 78: e59bc014 ldr ip, [fp, #20] 7c: e50bc038 str ip, [fp, #-56] 80: e3a0c04c mov ip, #76 ; 0x4c 84: e5cdc02c strb ip, [sp, #44] 88: e51bc020 ldr ip, [fp, #-32] 8c: e51be024 ldr lr, [fp, #-36] 90: e51b4028 ldr r4, [fp, #-40] 94: e51b502c ldr r5, [fp, #-44] 98: e51b6030 ldr r6, [fp, #-48] 9c: e51b7034 ldr r7, [fp, #-52] a0: e51b8038 ldr r8, [fp, #-56] a4: e1a0900d mov r9, sp a8: e5898008 str r8, [r9, #8] ac: e5897004 str r7, [r9, #4] b0: e5896000 str r6, [r9] b4: e58d0028 str r0, [sp, #40] b8: e1a0000c mov r0, ip bc: e58d1024 str r1, [sp, #36] c0: e1a0100e mov r1, lr c4: e58d2020 str r2, [sp, #32] c8: e1a02004 mov r2, r4 cc: e58d301c str r3, [sp, #28] d0: e1a03005 mov r3, r5 d4: ebfffffe bl 0 <leaf_call> d8: e59d001c ldr r0, [sp, #28] dc: e59d1020 ldr r1, [sp, #32] e0: e59d2024 ldr r2, [sp, #36] e4: e59d3028 ldr r3, [sp, #40] e8: e58d0018 str r0, [sp, #24] ec: e58d1014 str r1, [sp, #20] f0: e58d2010 str r2, [sp, #16] f4: e58d300c str r3, [sp, #12] f8: e24bd018 sub sp, fp, #24 ; 0x18 fc: e8bd8bf0 pop {r4, r5, r6, r7, r8, r9, fp, pc} 00000100 <main>: 100: e92d4800 push {fp, lr} 104: e1a0b00d mov fp, sp 108: e24dd018 sub sp, sp, #24 ; 0x18 10c: e3a00000 mov r0, #0 ; 0x0 110: e50b0004 str r0, [fp, #-4] 114: e3a01007 mov r1, #7 ; 0x7 118: e1a0200d mov r2, sp 11c: e582100c str r1, [r2, #12] 120: e3a01006 mov r1, #6 ; 0x6 124: e5821008 str r1, [r2, #8] 128: e3a01005 mov r1, #5 ; 0x5 12c: e5821004 str r1, [r2, #4] 130: e3a01004 mov r1, #4 ; 0x4 134: e5821000 str r1, [r2] 138: e3a01001 mov r1, #1 ; 0x1 13c: e3a02002 mov r2, #2 ; 0x2 140: e3a03003 mov r3, #3 ; 0x3 144: e50b0008 str r0, [fp, #-8] 148: ebfffffe bl 44 <nonleaf_call> 14c: e51b0008 ldr r0, [fp, #-8] 150: e1a0d00b mov sp, fp 154: e8bd8800 pop {fp, pc} ; vim: ft=asm68k