Messages in this thread | | | Date | Wed, 25 Mar 1998 14:15:24 -0800 (PST) | From | Dean Gaudet <> | Subject | Re: [PATCH] APM support doesn't compile with binutils 2.8.1.0.24 |
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On Wed, 25 Mar 1998, H. J. Lu wrote:
> After I doule checked with my Intel manual, I don't think it > is true. Can you show me an example with opcodes for "pushl %ds" > and %esp is changed by 4 bytes?
Yes. Here's push %ds, pop %ds with and without overrides.
Dean
% cat ds.c void main(void) { asm(".byte 0x1e\n"); asm(".byte 0x1f\n"); asm(".byte 0x66,0x1e\n"); asm(".byte 0x66,0x1f\n"); } % gcc -g ds.c % gdb a.out (gdb) b main Breakpoint 1 at 0x8048407: file ds.c, line 3. (gdb) disp/x $esp (gdb) run Starting program: /home/dgaudet/a.out
Breakpoint 1, main () at ds.c:3 3 asm(".byte 0x1e\n"); 1: /x $esp = 0xbffff964 (gdb) n 4 asm(".byte 0x1f\n"); 1: /x $esp = 0xbffff960 (gdb) n 5 asm(".byte 0x66,0x1e\n"); 1: /x $esp = 0xbffff964 (gdb) 6 asm(".byte 0x66,0x1f\n"); 1: /x $esp = 0xbffff962 (gdb) 7 } 1: /x $esp = 0xbffff964 (gdb) q
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