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