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checkasm: x86: properly save rdx/edx in checked_call()

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If the return value doesn't fit in a single register rdx/edx can in some
cases be used in addition to rax/eax.

Doesn't affect any of the existing checkasm tests but might be useful later.

Also comment the relevant code a bit better.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Henrik Gramner 2015-08-16 17:58:02 +02:00 committed by Anton Khirnov
parent faa3f17a76
commit e13da244f4
1 changed files with 7 additions and 0 deletions
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7
tests/checkasm/x86/checkasm.asm
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@ -145,10 +145,15 @@ cglobal checked_call, 2,15,16,max_args*8+8
or r14, r5
%endif
; Call fail_func() with a descriptive message to mark it as a failure
; if the called function didn't preserve all callee-saved registers.
; Save the return value located in rdx:rax first to prevent clobbering.
jz .ok
mov r9, rax
mov r10, rdx
lea r0, [error_message]
call fail_func
mov rdx, r10
mov rax, r9
.ok:
RET
@ -182,9 +187,11 @@ cglobal checked_call, 1,7
or r3, r5
jz .ok
mov r3, eax
mov r4, edx
lea r0, [error_message]
mov [esp], r0
call fail_func
mov edx, r4
mov eax, r3
.ok:
add esp, max_args*4