c - Read register value to variable, with one asm command -


how can read register value variable 1 inline assembler command? using gcc on old freebsd system (v2.1 i386).

i have such code:

static volatile unsigned long r_eax, r_ebx; asm ("movl %%eax, %0\n" :"=r"(r_eax)); asm ("movl %%ebx, %0\n" :"=r"(r_ebx));

as result this:

mov    %eax,%eax mov    %eax,0x1944b8 mov    0x1944b8,%eax mov    %ebx,%eax mov    %eax,0x1944bc mov    0x1944bc,%eax

but need just:

mov    %eax,0x1944b8 mov    %ebx,0x1944bc

how can achieve result?

this me (as long r_eax / r_ebx static)

asm ("movl %%eax, %0\n"      "movl %%ebx, %1\n"      : "=m"(r_eax), "=m"(r_ebx));

beware that, unless specify assembly language statements within same asm() bracket, compiler might decide sorts of "interesting optimizations" in-between, including modifications these regs.


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