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checkasm/x86: Correctly handle variadic functions

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The System V ABI on x86-64 specifies that the al register contains an upper
bound of the number of arguments passed in vector registers when calling
variadic functions, so we aren't allowed to clobber it.

checkasm_fail_func() is a variadic function so also zero al before calling it.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
This commit is contained in:
Henrik Gramner 2015-09-23 17:22:38 +02:00 committed by Anton Khirnov
parent 5405584b7b
commit cc28552100
1 changed files with 5 additions and 2 deletions
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7
tests/checkasm/x86/checkasm.asm
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@ -77,8 +77,10 @@ cglobal stack_clobber, 1,2
%if WIN64
%assign free_regs 7
DECLARE_REG_TMP 4
%else
%assign free_regs 9
DECLARE_REG_TMP 7
%endif
;-----------------------------------------------------------------------------
@ -86,7 +88,7 @@ cglobal stack_clobber, 1,2
;-----------------------------------------------------------------------------
INIT_XMM
cglobal checked_call, 2,15,16,max_args*8+8
mov r6, r0
mov t0, r0
; All arguments have been pushed on the stack instead of registers in order to
; test for incorrect assumptions that 32-bit ints are zero-extended to 64-bit.
@ -129,7 +131,7 @@ cglobal checked_call, 2,15,16,max_args*8+8
mov r %+ i, [n %+ i]
%assign i i-1
%endrep
call r6
call t0
%assign i 14
%rep 15-free_regs
xor r %+ i, [n %+ i]
@ -156,6 +158,7 @@ cglobal checked_call, 2,15,16,max_args*8+8
mov r9, rax
mov r10, rdx
lea r0, [error_message]
xor eax, eax
call fail_func
mov rdx, r10
mov rax, r9