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POiPhone mystery assembly
 

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  1. POiPhone mystery assembly
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    <p>I am studying a iPhone-assembly function containing calls to library functions open and fcntl. Being unfamiliar with assembly language in general I have trouble understanding the program execution. What I would like to know are the parameters for open and fcntl functions. Any other explanation what this function does is most welcome as well.</p> <p>Code: </p> <pre><code>-[Utilities openFileAsset]: 00000a94 b590 push {r4, r7, lr} 00000a96 af01 add r7, sp, #4 00000a98 b088 sub sp, #32 00000a9a ab01 add r3, sp, #4 00000a9c 6018 str r0, [r3, #0] 00000a9e 466b mov r3, sp 00000aa0 6019 str r1, [r3, #0] 00000aa2 ab01 add r3, sp, #4 00000aa4 681a ldr r2, [r3, #0] 00000aa6 4b4a ldr r3, [pc, #296] (0xbd0) 00000aa8 447b add r3, pc 00000aaa 681b ldr r3, [r3, #0] 00000aac 1c10 adds r0, r2, #0 00000aae 1c19 adds r1, r3, #0 00000ab0 f001ee46 blx 0x2740 ; symbol stub for: _objc_msgSend 00000ab4 1c03 adds r3, r0, #0 00000ab6 b2db uxtb r3, r3 00000ab8 2b00 cmp r3, #0 00000aba d100 bne.n 0xabe 00000abc e086 b.n 0xbcc 00000abe 4b45 ldr r3, [pc, #276] (0xbd4) 00000ac0 447b add r3, pc 00000ac2 681b ldr r3, [r3, #0] 00000ac4 681b ldr r3, [r3, #0] 00000ac6 1c1a adds r2, r3, #0 00000ac8 4b43 ldr r3, [pc, #268] (0xbd8) 00000aca 447b add r3, pc 00000acc 681b ldr r3, [r3, #0] 00000ace 1c10 adds r0, r2, #0 00000ad0 1c19 adds r1, r3, #0 00000ad2 2201 movs r2, #1 00000ad4 f001ee34 blx 0x2740 ; symbol stub for: _objc_msgSend 00000ad8 1c02 adds r2, r0, #0 00000ada 23f0 movs r3, #240 00000adc 005b lsls r3, r3, #1 00000ade 1c10 adds r0, r2, #0 00000ae0 2102 movs r1, #2 00000ae2 1c1a adds r2, r3, #0 00000ae4 f001ee84 blx 0x27f0 ; symbol stub for: _open 00000ae8 1c02 adds r2, r0, #0 00000aea 4b3c ldr r3, [pc, #240] (0xbdc) 00000aec 447b add r3, pc 00000aee 681b ldr r3, [r3, #0] 00000af0 601a str r2, [r3, #0] 00000af2 4b3b ldr r3, [pc, #236] (0xbe0) 00000af4 447b add r3, pc 00000af6 681b ldr r3, [r3, #0] 00000af8 681b ldr r3, [r3, #0] 00000afa 1c18 adds r0, r3, #0 00000afc 2104 movs r1, #4 00000afe 2204 movs r2, #4 00000b00 f001ee0e blx 0x2720 ; symbol stub for: _fcntl </code></pre>
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    1. COUh wait, you want the source code from someone else?! Or do you just forgot where you left your copy of the source?
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      1. POiPhone mystery assembly
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    2. COwhy do you need this info? There might be an easier way? http://pubs.opengroup.org/onlinepubs/009695399/functions/fcntl.html
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      1. POiPhone mystery assembly
      1. USmadmik3
 

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