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Align stack on 16-byte boundary for native calls in the assembly interpreter (bug 5601, r=dvander).

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This alignment is needed if a native calls a library function on OS X or uses SSE instructions.
This commit is contained in:
Scott Ehlert 2013-02-24 01:03:53 -06:00
parent fd100b2fa7
commit 895c856196
1 changed files with 34 additions and 10 deletions
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44
amxmodx/amxexecn.asm
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@ -56,6 +56,9 @@
;
;History (list of changes)
;-------------------------
; 24 february 2013 by Scott Ehlert
; Aligned stack to 16-byte boundary for native calls in case they make library
; calls on Mac OS X or use SSE instructions.
; 10 february 2006 by David Anderson
; Addition of float opcodes
; 17 february 2005 by Thiadmer Riemersms
@ -189,6 +192,21 @@
%endif
%endmacro
%macro _STK_ALIGN 1 ; align stack to 16-byte boundary and
; allocate %1 bytes of stack space
%if %1 % 16 != 0
%error "expected 16-byte aligned value"
%endif
push edi
mov edi, esp
and esp, 0xFFFFFFF0
sub esp, %1
%endmacro
%macro _STK_RESTORE 0 ; restore stack pointer after 16-byte alignment
mov esp, edi
pop edi
%endmacro
Start_CODE
@ -1265,13 +1283,15 @@ OP_SYSREQ_PRI:
push ebp
push esi
push edi
_STK_ALIGN 16 ; align stack to 16-byte boundary and
; allocate 16 bytes of stack space
; push the parameters
push ecx
push ebx
push edx
push eax
mov [esp+12], ecx
mov [esp+08], ebx
mov [esp+04], edx
mov [esp], eax
call [ebp+_callback]
_DROPARGS 10h ; remove arguments from stack
_STK_RESTORE ; restore stack pointer
pop edi ; restore saved registers
pop esi
pop ebp
@ -1308,11 +1328,13 @@ OP_SYSREQ_D: ; (TR)
push ebp
push esi
push edi
_STK_ALIGN 16 ; align stack to 16-byte boundary and
; allocate 16 bytes of stack space
; push the parameters
push edx
push eax
mov [esp+04], edx
mov [esp], eax
call ebx ; direct call
_DROPARGS 8 ; remove arguments from stack
_STK_RESTORE ; restore stack pointer
pop edi ; restore saved registers
pop esi
pop ebp
@ -1533,9 +1555,11 @@ OP_BREAK:
; call the debug hook
mov eax,ebp ; 1st parm: amx
_SAVEREGS
push eax
_STK_ALIGN 16 ; align stack to 16-byte boundary and
; allocate 16 bytes of stack space
mov [esp], eax
call [ebp+_debug] ; call debug function
_DROPARGS 4 ; remove arguments from stack
_STK_RESTORE ; restore stack pointer
cmp eax,AMX_ERR_NONE
je short break_noabort; continue running
mov [ebp+_error],eax ; save EAX (error code) before restoring all regs