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From: Simon Wright <simon@pushface.org>
Newsgroups: comp.lang.ada
Subject: Re: Erroneous code generation from GNAT or GCC?
Date: Tue, 30 Apr 2013 23:22:28 +0100
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Date: 2013-04-30T23:22:28+01:00
List-Id: <comp.lang.ada>

"Yannick Duchêne (Hibou57)" <yannick_duchene@yahoo.fr> writes:

> Le Tue, 30 Apr 2013 21:06:09 +0200, Simon Wright <simon@pushface.org>
> a écrit:
>> I was wondering what you meant by using constraints "a", "b", "c", "d"
>> .. I now see [3] that these are i386 constraints for the a..d registers
>> respectively, no wonder they gave wierd results on x86_64 where they
>> mean something quite different!
>
> They do exists with 64 bits instructions too. a is eax; b is ebx, etc,
> for 32 bits mode, and a is rax, b is rbx, etc, for 64 bits mode. There
> is also ax/ah/al, ax/bh/bl, etc, as sub-parts of the above, except ax,
> bx, etc, is for 16 bits only, but ah, al, bh, bl are still a
> accessible in 32 bits mode - I don't know if it's still the case in 64
> bits mode.

Your

      System.Machine_Code.Asm
        (Template => "int $0x80",
         Outputs => Integer'Asm_Output ("=a", Result),
         Inputs =>
           (Positive'Asm_Input       ("a", Number),
            Natural'Asm_Input        ("b", Handle),
            System.Address'Asm_Input ("c", Address),
            Natural'Asm_Input        ("d", Size)),
         Volatile => True);

translated to

	movl	%ecx, %edx
	movl	%edi, %eax
	movl	%esi, %ebx
	movq	%r8, %rcx
# 14 "library.adb" 1
	int $0x80

but I think I really don't want to learn Intel assembler, lots of other
good things to do.