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crt*.S should be given a closer look #1

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opened 2021-11-11 17:51:05 +00:00 by auravulpes · 0 comments
auravulpes commented 2021-11-11 17:51:05 +00:00
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As written, they just take the amd64 versions from OS Dev Wiki and rewrite any 64-bit registers to 32-bit ones. But is that right? Like, we push edi and esi onto the stack then pop later, but, apparently, in i386 SysV calling convention, edi and esi are preserved, unlike rdi and rsi in the amd64 calling convention. I'll need to come back to these.

As written, they just take the amd64 versions from OS Dev Wiki and rewrite any 64-bit registers to 32-bit ones. But is that right? Like, we push edi and esi onto the stack then pop later, but, apparently, in i386 SysV calling convention, edi and esi are preserved, unlike rdi and rsi in the amd64 calling convention. I'll need to come back to these.
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Reference: auravulpes/FENIX_libc#1
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