Re: Calling libraries from assembler.

(Scott Lurndal) wrote:
>>
>> On 64-bit x86:
>>
>> 	mov arg3,%rdx
>> 	mov arg2,%rsi
>> 	mov arg1,%rdi
>> 	call func
>> 	mov %rax,foo
>>
>> 	-hpa
>>
> 
> Although the [x86-64] part does get a bit more complicated after the
first 6 args,
> for floating args, and for arguments that don't fit in a 64-bit
register.
> 

Right.  I also didn't mention that the caller needs to clean up any 
stack arguments:

[32 bit code]

 >> 	/* foo = func(arg1, arg2, arg3) */
 >>
 >> 	push arg3
 >> 	push arg2
 >> 	push arg1
 >> 	call func
	add $3*4,%esp
 >> 	mov %eax,foo

	-hpa