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Merge Fault Checks improvements into my Slab6 #11

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Merge Fault Checks improvements into my Slab6 #11

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30 changes: 17 additions & 13 deletions s6.asm
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,7 @@ else
.XMM ;To compile with Microsoft assembler: >ml /c /coff s6.asm
endif

BUFZSIZ EQU 256
BUFZSIZ EQU 512

EXTRN _ptfaces16 : dword
EXTRN _lcol : dword
Expand All @@ -22,15 +22,19 @@ ASSUME cs:CODE,ds:CODE

PUBLIC _s6_asm_dep_unlock ;Data Execution Prevention unlock (works under XP2 SP2)
_s6_asm_dep_unlock:
EXTRN __imp__VirtualProtect@16:NEAR
sub esp, 4
push esp
push 40h ;PAGE_EXECUTE_READWRITE
push offset _dep_protect_end - offset _s6_asm_dep_unlock
push offset _s6_asm_dep_unlock
call dword ptr __imp__VirtualProtect@16
add esp, 4
ret
EXTRN __imp__VirtualProtect@16:NEAR
sub esp, 4
push dword ptr esp
push 40h

mov eax, _dep_protect_end
sub eax, _s6_asm_dep_unlock
push eax

push offset _s6_asm_dep_unlock
call dword ptr __imp__VirtualProtect@16
add esp, 4
ret

PUBLIC _caddasm, _ztabasm, _qsum0, _qsum1, _qbplbpp, _kv6frameplace, _kv6bpl
ALIGN 16
Expand All @@ -45,9 +49,9 @@ _kv6bpl dd 0
ALIGN 16
PUBLIC _drawboundcubeasm ;Visual C entry point (pass by stack)
_drawboundcubeasm:
mov edx, [esp+4]
mov eax, [esp+8]
mov ecx, [esp+12]
mov edx, DWORD PTR [esp+4]
mov eax, DWORD PTR [esp+8]
mov ecx, DWORD PTR [esp+12]
PUBLIC drawboundcubeasm_ ;Watcom C entry point (pass by register)
drawboundcubeasm_:
push ebx ;Visual C's _cdecl requires EBX,ESI,EDI,EBP to be preserved
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