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x86_64
- From: Yang Zhang <yanghatespam at gmail dot com>
- To: GCC-help <gcc-help at gcc dot gnu dot org>
- Date: Mon, 19 Jan 2009 05:16:19 -0500
- Subject: x86_64
Are there any good resources for learning about gcc's x86_64 assembly
output? When I run `gcc -S a.c` for a simple test C program like the
one below, I can completely understand the resulting go.s on a 32-bit
x86, but as soon as I run that on a 64-bit machine, I'm lost. I know
what the instructions are (i.e. I know how to use the AMD manuals), but
I'd like to learn about gcc's assembly output: the exact new calling
conventions (registers seem to be more liberally used over the stack now
even without opt), all these
.LFB/.LCFI/.LFE/.Lframe/.LSCIE/.LSFDE/.LASFDE/... labels, and so on.
Thanks in advance for any guidance.
void foo(int a, int b, int c) { char xs[5]; char ys[10]; }
int main() { foo(1,2,3); return 0; }
--
Yang Zhang
http://www.mit.edu/~y_z/