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amxmodx/amxmodx/amxexecn.asm
David Anderson 635d18de92 tiny optimizations from evilspy
2006-02-22 01:36:29 +00:00

1749 lines
40 KiB
NASM
Executable File
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; AMXEXECN.ASM Abstract Machine for the "Pawn" language
;
;Some notes:
; * This file was adapted from AMXEXEC.ASM (for MASM/TASM/WASM). This
; version is for NASM (Netwide Assembler). NASM uses Intel syntax for
; the mnemonics, but it is not compatible with MASM.
; * The "calling convention" is __cdecl for the amx_exec_asm() itself and
; __cdecl or __stdcall for the native routines (the default is __cdecl,
; define the macro STDECL to set __stdcall).
; * The borland compiler uses different segment definitions as Microsoft
; Visual C/C++ and GNU GCC. To assemble the abstract machine with "Borland"
; segments, add the definition "BORLAND" on the command line.
; * You will need to compile the standard AMX.C file with the macro ASM32
; defined. On the command line, use:
; nasmw -f obj -d BORLAND amxexecn.asm
; bcc32 -DASM32 srun.c amx.c amxcore.c amxcons.c amxexecn.obj
; or
; nasmw -f win32 amxexecn.asm
; or
; nasm -f elf amxexecn.asm
; gcc -o srun -DLINUX -DASM32 -I../linux srun.c amx.c amxcore.c amxcons.c amxexecn.o
; * See the notes in AMXEXEC.ASM for more information and a change log).
;
;
;Copyright and license of use, please read
;-----------------------------------------
;The assembler implementation of the abstract machine for the Pawn language,
;specifically the file AMXEXEC.ASM, is copyright (c) 1998-2000 by Marc Peter.
;
;Permission is hereby granted, without written agreement and without paid
;license or royalty fees, to use, copy, modify, and distribute this software
;and its documentation for any purpose, subject to the following conditions:
;
;1. The above copyright notice and this permission notice shall appear in all
; copies or substantial portions of this software.
;
;2. Modifications of this software that do not originate from me (Marc Peter)
; must be explicitly mentioned in a README file or another appropriate
; place.
;
;The use of this software as a subsystem of a larger software product is
;explicitly allowed, regardless of whether that larger product is proprietary,
;gratis or commercially available.
;
;I (Marc Peter) specifically disclaim any warranties, including, but not
;limited to, the implied warranties of merchantability and fitness for a
;particular purpose. The software is provided on an "as is" basis,
;and I have no obligation to provide maintenance, support, updates,
;enhancements or modifications.
;
;I cannot be held liable for any damage or loss of profits that results
;from the use of the software (or part thereof), or from the inability to
;use it.
;
;
;History (list of changes)
;-------------------------
; 10 february 2006 by David Anderson
; Addition of float opcodes
; 17 february 2005 by Thiadmer Riemersms
; Addition of the BREAK opcode, removal of the older debugging opcode table.
; 6 march 2004 by Thiadmer Riemersma
; Corrected a bug in OP_FILL, where a cell preceding the array would
; be overwritten (zero'ed out). This bug was brought to my attention
; by Robert Daniels.
; 2 february 2004 by Thiadmer Riemersma (TR)
; Added checking of the return address in the RET and RETN opcodes.
; Changed handling of LINE opcode, so that the debugger can force a
; sleep.
; 22 december 2003 by Thiadmer Riemersma (TR)
; Added support for the SYMTAG and SYSCALL.D opcodes
; 3 october 2003 by Thiadmer Riemersma (TR)
; Added "non-debug" versions of various opcodes, to avoid repetitive
; checking of the "debug" flag.
; 15 September 2003 by Thiadmer Riemersma (TR)
; Minor corrections, mostly to support older versions of NASM
; 26 January 2003 by Thiadmer Riemersma (TR)
; Port to NASM
;-----
;CPU 386 -- some older versions of NASM do not support this keyword
; Macro to begin a code segment
%macro Start_CODE 0
%ifdef BORLAND
segment _TEXT public align=1 class=CODE use32
%else
segment .text
%endif
%endmacro
; Macro to begin a data segment
%macro Start_DATA 0
%ifdef BORLAND
segment _DATA public align=4 class=DATA use32
%else
segment .data
%endif
%endmacro
%include "amxdefn.asm"
;#define PUSH(v) ( stk-=sizeof(cell), *(cell *)(data+(int)stk)=v )
%macro _PUSH 1
mov [edi+ecx-4],%1
sub ecx,4
%endmacro
;#define POP(v) ( v=*(cell *)(data+(int)stk), stk+=sizeof(cell) )
%macro _POP 1
mov %1,[edi+ecx]
add ecx,4
%endmacro
%macro GO_ON 0
jmp DWORD [esi]
; ALIGN 4
%endmacro
%macro _CHKSTACK 0
cmp ecx,stp
jg near err_stacklow
%endmacro
%macro _CHKMARGIN 0
lea ebp,[ecx-16*4] ;savety margin = 16 cells
cmp hea,ebp
jg near err_stack
%endmacro
;Normal abort, saves pri/alt
%macro _ABORT 1
mov ebp,amx
mov [ebp+_pri], dword eax ; store values in AMX structure (PRI, ALT)
mov [ebp+_alt], dword edx ; store values in AMX structure (PRI, ALT)
mov [ebp+_error], dword %1
jmp _return
%endmacro
;Checked abort, saves nothing and uses a conditional
%macro _CHKABORT 1
mov ebp,amx
mov [ebp+_error], %1
cmp %1, AMX_ERR_NONE
jne _return
%endmacro
;Fast abort, only aborts, nothing else
%macro _FASTABORT 0
jmp _return
%endmacro
%macro _CHKHEAP 0
mov ebp,amx
mov ebp,[ebp+_hlw]
cmp DWORD hea,ebp
jl near err_heaplow
%endmacro
%macro _CHKDIVIDEZERO 0
or ebp,ebp ; check for divide by zero
jz near err_divide
%endmacro
%macro _VERIFYADDRESS 1 ; used in load.i, store.i & lidx
cmp %1,stp ; error if address >= stp
jae near err_memaccess
cmp %1,hea ; so address<stp, ok if address<hea
jb short %%address_ok
cmp %1,ecx ; so address<stp and address>=hea, ok if address>=stk
jb near err_memaccess
%%address_ok:
%endmacro
%macro _SAVEREGS 0 ; save the registers (that may not be
PUSHAD ; __stdcall calling conventions)
%endmacro
%macro _RESTOREREGS 0
POPAD
%endmacro
%macro _DROPARGS 1 ; remove function arguments from the stack
%ifndef STDECL ; (only for __cdecl calling convention)
add esp,%1
%endif
%endmacro
Start_CODE
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
; ;
;cell asm_exec( cell *regs, cell *retval, cell stp, cell hea );
; ;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
GLOBAL _amx_exec_asm
GLOBAL amx_exec_asm
amx_exec_asm:
_amx_exec_asm: ;PROC
push ebx
mov eax,[esp+08h]
mov edx,[esp+0ch]
mov ebx,[esp+10h]
mov ecx,[esp+14h]
push edi
push esi
push ebp
sub esp,4*3 ; place for PRI, ALT & STK at SYSREQs
push DWORD [eax+20h] ; store code size
push DWORD [eax+1ch] ; store pointer to code segment
push DWORD [eax+18h] ; store pointer to AMX
push edx ; store address of retval
push ebx ; store STP
push ecx ; store HEA
push DWORD [eax+14h] ; store FRM
%define stk [esp+36] ; define some aliases to registers
%define alt [esp+32] ; that are stored on the stack
%define pri [esp+28]
%define codesiz [esp+24]
%define code [esp+20]
%define amx [esp+16]
%define retval [esp+12]
%define stp [esp+8]
%define hea [esp+4]
%define frm [esp] ; FRM is NOT stored in ebp, rather FRM+DAT
; is being held in ebx.
mov edx,code ; change the code size to an...
add codesiz,edx ; ..."end of code" address
mov edx,[eax+04h] ; get ALT
mov esi,[eax+08h] ; get CIP
mov edi,[eax+0ch] ; get pointer to data segment
mov ecx,[eax+10h] ; get STK
mov ebx,[eax+14h] ; get FRM
mov eax,[eax] ; get PRI
add ebx,edi ; relocate frame
GO_ON ; start interpreting
OP_LOAD_PRI:
mov eax,[esi+4]
add esi,8
mov eax,[edi+eax]
GO_ON
OP_LOAD_ALT:
mov edx,[esi+4]
add esi,8
mov edx,[edi+edx]
GO_ON
;good
OP_LOAD_S_PRI:
mov eax,[esi+4]
add esi,8
mov eax,[ebx+eax]
GO_ON
;good
OP_LOAD_S_ALT:
mov edx,[esi+4]
add esi,8
mov edx,[ebx+edx]
GO_ON
OP_LOAD_I:
add esi,4
_VERIFYADDRESS eax
mov eax,[edi+eax]
GO_ON
OP_LODB_I:
_VERIFYADDRESS eax
mov ebp,[esi+4]
mov eax,[edi+eax] ;subject to misalignment stalls
add esi,8
and eax,DWORD [(lodb_and-4)+ebp*4]
GO_ON
OP_LREF_PRI:
mov eax,[esi+4]
add esi,8
mov eax,[edi+eax]
mov eax,[edi+eax]
GO_ON
OP_LREF_ALT:
mov edx,[esi+4]
add esi,8
mov edx,[edi+edx]
mov edx,[edi+edx]
GO_ON
OP_LREF_S_PRI:
mov eax,[esi+4]
add esi,8
mov eax,[ebx+eax]
mov eax,[edi+eax]
GO_ON
OP_LREF_S_ALT:
mov edx,[esi+4]
add esi,8
mov edx,[ebx+edx]
mov edx,[edi+edx]
GO_ON
;good
OP_CONST_PRI:
mov eax,[esi+4]
add esi,8
GO_ON
;good
OP_CONST_ALT:
mov edx,[esi+4]
add esi,8
GO_ON
;good
OP_ADDR_PRI:
mov eax,[esi+4]
add esi,8
add eax,frm
GO_ON
;good
OP_ADDR_ALT:
mov edx,[esi+4]
add esi,8
add edx,frm
GO_ON
OP_STOR_PRI:
mov ebp,[esi+4]
add esi,8
mov [ebp+edi],eax
GO_ON
OP_STOR_ALT:
mov ebp,[esi+4]
add esi,8
mov [ebp+edi],edx
GO_ON
;good
OP_STOR_S_PRI:
mov ebp,[esi+4]
add esi,8
mov [ebp+ebx],eax
GO_ON
;good
OP_STOR_S_ALT:
mov ebp,[esi+4]
add esi,8
mov [ebp+ebx],edx
GO_ON
;good
OP_STOR_I:
add esi,4
_VERIFYADDRESS edx
mov [edi+edx],eax
GO_ON
OP_STRB_I:
_VERIFYADDRESS edx
mov ebp,[esi+4]
add esi,8
cmp ebp,1
jne short strb_not1byte
mov [edi+edx],al
GO_ON
strb_not1byte:
cmp ebp,4
je short strb_4byte
mov [edi+edx],ax
GO_ON
strb_4byte:
mov [edi+edx],eax
GO_ON
OP_SREF_PRI:
mov ebp,[esi+4]
add esi,8
mov ebp,[edi+ebp]
mov [edi+ebp],eax
GO_ON
OP_SREF_ALT:
mov ebp,[esi+4]
add esi,8
mov ebp,[edi+ebp]
mov [edi+ebp],edx
GO_ON
OP_SREF_S_PRI:
mov ebp,[esi+4]
add esi,8
mov ebp,[ebx+ebp]
mov [edi+ebp],eax
GO_ON
OP_SREF_S_ALT:
mov ebp,[esi+4]
add esi,8
mov ebp,[ebx+ebp]
mov [edi+ebp],edx
GO_ON
;good
OP_LIDX:
lea eax,[edx+4*eax]
add esi,4
_VERIFYADDRESS eax
mov eax,[edi+eax]
GO_ON
OP_LIDX_B:
push ecx
mov ecx,[esi+4]
shl eax,cl
add esi,8
add eax,edx
pop ecx
_VERIFYADDRESS eax
mov eax,[edi+eax]
GO_ON
;good
OP_IDXADDR:
add esi,4
lea eax,[edx+4*eax]
GO_ON
OP_IDXADDR_B:
push ecx
mov ecx,[esi+4]
add esi,8
shl eax,cl
pop ecx
add eax,edx
GO_ON
OP_ALIGN_PRI:
mov ebp,4 ; ??? one operation too many?
sub ebp,[esi+4]
add esi,8
xor eax,ebp
GO_ON
OP_ALIGN_ALT:
mov ebp,4
sub ebp,[esi+4]
add esi,8
xor edx,ebp
GO_ON
OP_LCTRL:
mov ebp,[esi+4]
add esi,8
cmp ebp,0
jne short lctrl_1
mov eax,code ; COD
GO_ON
lctrl_1:
cmp ebp,1
jne short lctrl_2
mov eax,edi ; DAT
GO_ON
lctrl_2:
cmp ebp,2
jne short lctrl_3
mov eax,hea ; 2=HEA
GO_ON
lctrl_3:
cmp ebp,3
jne short lctrl_4
mov ebp,amx
mov eax,stp
GO_ON
lctrl_4:
cmp ebp,4
jne short lctrl_5
mov eax,ecx ; 4=STK
GO_ON
lctrl_5:
cmp ebp,5
jne short lctrl_6
mov eax,frm ; 5=FRM
GO_ON
lctrl_6:
mov eax,esi ; 6=CIP
sub eax,code
GO_ON
OP_SCTRL:
mov ebp,[esi+4]
add esi,8
cmp ebp,2
jne short sctrl_4
mov hea,eax ; 2=HEA
GO_ON
sctrl_4:
cmp ebp,4
jne short sctrl_5
mov ecx,eax ; 4=STK
GO_ON
sctrl_5:
cmp ebp,5
jne short sctrl_6
mov ebx,eax ; 5=FRM
mov frm,eax
add ebx,edi ; relocate FRM
sctrl_6:
GO_ON
OP_MOVE_PRI:
add esi,4
mov eax,edx
GO_ON
;good
OP_MOVE_ALT:
add esi,4
mov edx,eax
GO_ON
OP_XCHG:
add esi,4
xchg eax,edx
GO_ON
;good
OP_PUSH_PRI:
add esi,4
_PUSH eax
GO_ON
;good
OP_PUSH_ALT:
add esi,4
_PUSH edx
GO_ON
OP_PUSH_R_PRI:
mov ebp,[esi+4]
add esi,8
push_loop:
_PUSH eax
dec ebp
jnz short push_loop
GO_ON
;good
OP_PUSH_C:
mov ebp,[esi+4]
add esi,8
_PUSH ebp
GO_ON
OP_PUSH:
mov ebp,[esi+4]
add esi,8
mov ebp,[ebp+edi]
_PUSH ebp
GO_ON
;good
OP_PUSH_S:
mov ebp,[esi+4]
add esi,8
mov ebp,[ebp+ebx]
_PUSH ebp
GO_ON
OP_POP_PRI:
add esi,4
_POP eax
GO_ON
;good
OP_POP_ALT:
add esi,4
_POP edx
GO_ON
;good
OP_STACK:
mov edx,ecx
add ecx,[esi+4]
_CHKMARGIN
_CHKSTACK
add esi,8
GO_ON
;good
OP_HEAP:
mov ebp,[esi+4]
mov edx,hea
add esi,8
add hea,ebp
_CHKMARGIN
_CHKHEAP
GO_ON
;good
OP_PROC:
mov ebx,frm
add esi,4
_PUSH ebx
mov ebx,edi
mov frm,ecx
add ebx,ecx
_CHKMARGIN
GO_ON
OP_RET:
_POP ebx
_POP esi
cmp esi,code ; verify ESI>=code
jb err_memaccess
cmp esi,codesiz ; verify ESI<codesiz ("end-of-code" pointer)
jae err_memaccess
mov frm,ebx
add ebx,edi
GO_ON
;good
OP_RETN:
_POP ebx
_POP esi
cmp esi,code ; verify ESI>=code
jb err_memaccess
cmp esi,codesiz ; verify ESI<codesiz ("end-of-code" pointer)
jae err_memaccess
mov frm,ebx
add ebx,edi
mov ebp,[edi+ecx]
lea ecx,[ecx+ebp+4]
GO_ON
OP_CALL:
lea ebp,[esi+8]
mov esi,[esi+4]
_PUSH ebp
GO_ON
OP_CALL_PRI:
lea ebp,[esi+4]
mov esi,eax
add esi,code ; cip = PRI + code
_PUSH ebp
GO_ON
;good
OP_JUMP:
mov esi,[esi+4]
GO_ON
OP_JREL:
add esi,[esi+4]
add esi,8
GO_ON
;good
OP_JZER:
or eax,eax
jz short jump_taken
add esi,8
GO_ON
jump_taken:
mov esi,[esi+4]
GO_ON
;good
OP_JNZ:
or eax,eax
jnz short jump_taken
add esi,8
GO_ON
;good
OP_JEQ:
cmp eax,edx
je short jump_taken
add esi,8
GO_ON
OP_JNEQ:
cmp eax,edx
jne short jump_taken
add esi,8
GO_ON
OP_JLESS:
cmp eax,edx
jb short jump_taken
add esi,8
GO_ON
OP_JLEQ:
cmp eax,edx
jbe short jump_taken
add esi,8
GO_ON
OP_JGRTR:
cmp eax,edx
ja short jump_taken
add esi,8
GO_ON
OP_JGEQ:
cmp eax,edx
jae short jump_taken ; unsigned comparison
add esi,8
GO_ON
OP_JSLESS:
cmp eax,edx
jl short jump_taken
add esi,8
GO_ON
;good
OP_JSLEQ:
cmp eax,edx
jle near jump_taken
add esi,8
GO_ON
OP_JSGRTR:
cmp eax,edx
jg near jump_taken
add esi,8
GO_ON
OP_JSGEQ:
cmp eax,edx
jge near jump_taken ; signed comparison
add esi,8
GO_ON
OP_SHL:
push ecx
mov ecx,edx
add esi,4
shl eax,cl
pop ecx
GO_ON
OP_SHR:
push ecx
mov ecx,edx
add esi,4
shr eax,cl
pop ecx
GO_ON
OP_SSHR:
push ecx
mov ecx,edx
add esi,4
sar eax,cl
pop ecx
GO_ON
OP_SHL_C_PRI:
push ecx
mov ecx,[esi+4]
add esi,8
shl eax,cl
pop ecx
GO_ON
OP_SHL_C_ALT:
push ecx
mov ecx,[esi+4]
add esi,8
shl edx,cl
pop ecx
GO_ON
OP_SHR_C_PRI:
push ecx
mov ecx,[esi+4]
add esi,8
shr eax,cl
pop ecx
GO_ON
OP_SHR_C_ALT:
push ecx
mov ecx,[esi+4]
add esi,8
shr edx,cl
pop ecx
GO_ON
OP_SMUL:
add esi,4
push edx
imul edx
pop edx
GO_ON
;good
OP_SDIV_ALT:
xchg eax,edx
ALIGN 4
OP_SDIV:
mov ebp,edx
xor edx,eax ; Check signs of the operands.
cdq
js short sdiv_fiddle ; If the signs of the operands are different
; we'll have to fiddle around to achieve
; proper rounding towards minus infinity.
_CHKDIVIDEZERO
add esi,4 ; default behavior is right in the other cases
idiv ebp
GO_ON
sdiv_fiddle:
_CHKDIVIDEZERO
idiv ebp
add esi,4
or edx,edx
jz short sdiv_goon ; If there's no remainder the result is correct
add edx,ebp ; else fix the result values.
dec eax ; Amazing, how simple this is...
sdiv_goon:
GO_ON
OP_UMUL:
add esi,4
push edx
mul edx
pop edx
GO_ON
OP_UDIV:
mov ebp,edx
sub edx,edx
_CHKDIVIDEZERO
add esi,4
div ebp
GO_ON
OP_UDIV_ALT:
mov ebp,eax
mov eax,edx
sub edx,edx
_CHKDIVIDEZERO
add esi,4
div ebp
GO_ON
;good
OP_ADD:
add esi,4
add eax,edx
GO_ON
;good
OP_SUB:
add esi,4
sub eax,edx
GO_ON
;good
OP_SUB_ALT:
neg eax
add esi,4
add eax,edx
GO_ON
OP_AND:
add esi,4
and eax,edx
GO_ON
OP_OR:
add esi,4
or eax,edx
GO_ON
OP_XOR:
add esi,4
xor eax,edx
GO_ON
OP_NOT:
add esi,4
neg eax ; sets CF iff EAX != 0
sbb eax,eax ; EAX == -1 iff CF set (zero otherwise)
inc eax ; -1 => 0 and 0 => 1
GO_ON
OP_NEG:
add esi,4
neg eax
GO_ON
OP_INVERT:
add esi,4
not eax
GO_ON
;good
OP_ADD_C:
add eax,[esi+4]
add esi,8
GO_ON
;good
OP_SMUL_C:
mov ebp,[esi+4]
push edx
imul ebp
pop edx
add esi,8
GO_ON
;good
OP_ZERO_PRI:
add esi,4
sub eax,eax
GO_ON
;good
OP_ZERO_ALT:
add esi,4
sub edx,edx
GO_ON
OP_ZERO:
mov ebp,[esi+4]
add esi,8
mov DWORD [edi+ebp],0
GO_ON
OP_ZERO_S:
mov ebp,[esi+4]
add esi,8
mov DWORD [ebx+ebp],0
GO_ON
OP_SIGN_PRI:
shl eax,24
add esi,4
sar eax,24
GO_ON
OP_SIGN_ALT:
shl edx,24
add esi,4
sar edx,24
GO_ON
OP_EQ:
add esi,4
cmp eax,edx ; PRI == ALT ?
mov eax,0
sete al
GO_ON
OP_NEQ:
add esi,4
cmp eax,edx ; PRI != ALT ?
mov eax,0
setne al
GO_ON
OP_LESS:
add esi,4
cmp eax,edx ; PRI < ALT ? (unsigned)
mov eax,0
setb al
GO_ON
OP_LEQ:
add esi,4
cmp eax,edx ; PRI <= ALT ? (unsigned)
mov eax,0
setbe al
GO_ON
OP_GRTR:
add esi,4
cmp eax,edx ; PRI > ALT ? (unsigned)
mov eax,0
seta al
GO_ON
OP_GEQ:
add esi,4
cmp eax,edx ; PRI >= ALT ? (unsigned)
mov eax,0
setae al
GO_ON
;good
OP_SLESS:
add esi,4
cmp eax,edx ; PRI < ALT ? (signed)
mov eax,0
setl al
GO_ON
OP_SLEQ:
add esi,4
cmp eax,edx ; PRI <= ALT ? (signed)
mov eax,0
setle al
GO_ON
OP_SGRTR:
add esi,4
cmp eax,edx ; PRI > ALT ? (signed)
mov eax,0
setg al
GO_ON
OP_SGEQ:
add esi,4
cmp eax,edx ; PRI >= ALT ? (signed)
mov eax,0
setge al
GO_ON
OP_EQ_C_PRI:
cmp eax,[esi+4] ; PRI == value ?
lea esi,[esi+8]
mov eax,0
sete al
GO_ON
OP_EQ_C_ALT:
xor eax,eax
cmp edx,[esi+4] ; ALT == value ?
lea esi,[esi+8]
sete al
GO_ON
OP_INC_PRI:
add esi,4
inc eax
GO_ON
OP_INC_ALT:
add esi,4
inc edx
GO_ON
OP_INC:
mov ebp,[esi+4]
add esi,8
inc DWORD [edi+ebp]
GO_ON
;good
OP_INC_S:
mov ebp,[esi+4]
add esi,8
inc DWORD [ebx+ebp]
GO_ON
OP_INC_I:
add esi,4
inc DWORD [edi+eax]
GO_ON
OP_DEC_PRI:
add esi,4
dec eax
GO_ON
OP_DEC_ALT:
add esi,4
dec edx
GO_ON
OP_DEC:
mov ebp,[esi+4]
add esi,8
dec DWORD [edi+ebp]
GO_ON
OP_DEC_S:
mov ebp,[esi+4]
add esi,8
dec DWORD [ebx+ebp]
GO_ON
OP_DEC_I:
add esi,4
sub DWORD [edi+eax],1
GO_ON
OP_MOVS:
_VERIFYADDRESS eax ; PRI
_VERIFYADDRESS edx ; ALT
mov ebp,eax
add ebp,[esi+4]
dec ebp
_VERIFYADDRESS ebp ; PRI + size - 1
mov ebp,edx
add ebp,[esi+4]
dec ebp
_VERIFYADDRESS ebp ; ALT + size - 1
push ecx
mov ecx,[esi+4]
add esi,8
push edi
push esi
lea esi,[edi+eax]
lea edi,[edi+edx]
push ecx
shr ecx,2
rep movsd
pop ecx
and ecx,3
rep movsb
pop esi
pop edi
pop ecx
GO_ON
OP_CMPS:
_VERIFYADDRESS eax ; PRI
_VERIFYADDRESS edx ; ALT
mov ebp,eax
add ebp,[esi+4] ; size in bytes
dec ebp ; EBP = PRI + size - 1
_VERIFYADDRESS ebp ; PRI + size - 1
sub ebp,eax ; EBP = size - 1
add ebp,edx ; EBP = ALT + size - 1
_VERIFYADDRESS ebp ; ALT + size - 1
push ecx
mov ecx,[esi+4]
add esi,8
push edi
push esi
lea esi,[edi+edx]
lea edi,[edi+eax]
xor eax,eax
repe cmpsb
je short cmps1
sbb eax,eax
sbb eax,0ffffffffh
cmps1:
pop esi
pop edi
pop ecx
GO_ON
OP_FILL:
mov ebp,[esi+4] ; get byte count
add esi,8
and ebp,0fffffffch ; align to words
jz short fill_ready
_VERIFYADDRESS edx ; ALT
dec ebp ; EBP = size - 1
add ebp,edx ; EBP = ALT + size - 1
_VERIFYADDRESS ebp ; ALT + size - 1
sub ebp,edx ; restore EBP
inc ebp
push ecx
push edi
mov ecx,ebp ; ECX = count (in bytes)
lea edi,[edi+edx] ; EDI = physical starting address
shr ecx,2 ; ECX = count (in DWORDS)
rep stosd
pop edi
pop ecx
fill_ready:
GO_ON
OP_HALT:
cmp DWORD retval,0
je short halt_no_retval
mov ebp,retval
mov [ebp],eax
halt_no_retval:
; store the complete status in the AMX
mov ebp,amx ; get amx into ebp
mov [ebp+_pri],eax ; store values in AMX structure (PRI, ALT, STK, HEA, FRM, ...)
mov [ebp+_alt],edx
mov [ebp+_stk],ecx
mov ecx,hea
mov ebx,frm
mov [ebp+_hea],ecx
mov [ebp+_frm],ebx ; EBX & ECX are invalid by now
mov ebx,[esi+4] ; EBX=parameter of the HALT opcode
add esi,8 ; skip this instruction
mov eax,esi ; EAX=CIP
sub eax,code
mov [ebp+_cip],eax
_ABORT ebx
OP_BOUNDS:
mov ebp,[esi+4]
add esi,8
cmp eax,ebp
ja near err_bounds ; use unsigned comparison, so <0 is >bounds
GO_ON
OP_SYSREQ_C:
mov eax,[esi+4] ; get function number
add esi,4
OP_SYSREQ_PRI:
mov ebp,amx ; get amx into ebp
add esi,4
mov stk,ecx ; save STK
mov alt,edx ; save ALT
mov [ebp+_stk],ecx ; store values in AMX structure (STK, HEA, FRM)
;we don't save regs since they're useless after this
mov ecx,hea
mov ebx,frm
mov [ebp+_hea],ecx
mov [ebp+_frm],ebx ; ebx & ecx are invalid by now
mov ebx,esi ; also store CIP
sub ebx,code
mov [ebp+_cip],ebx
mov edx,eax ; 2nd param: function number
mov eax,ebp ; 1st param: amx
mov ecx,stk
lea ebx,pri ; 3rd param: addr. of retval
add ecx,edi ; 4th param: addr. of function parameters
; save a few registers (it is not necessary to save them all
; and EAX should *not* be saved because it will hold the return
; value)
push ebp
push esi
push edi
; push the parameters
push ecx
push ebx
push edx
push eax
call [ebp+_callback]
_DROPARGS 10h ; remove arguments from stack
pop edi ; restore saved registers
pop esi
pop ebp
_CHKABORT eax ; if result was invalid, leave
mov eax,pri ; get retval into eax (PRI)
mov edx,alt ; restore ALT
mov ebx,frm
mov ecx,stk ; restore STK
add ebx,edi ; restore FRM
GO_ON
OP_SYSREQ_D: ; (TR)
mov ebx,[esi+4] ; get function address
mov ebp,amx ; get amx into ebp
add esi,8
mov stk,ecx ; save STK
mov alt,edx ; save ALT
mov [ebp+_stk],ecx ; store values in AMX structure (STK, HEA, FRM)
mov ecx,hea
mov eax,frm
mov [ebp+_hea],ecx
mov [ebp+_frm],eax ; eax & ecx are invalid by now
mov eax,ebp ; 1st param: amx
mov edx,stk
add edx,edi ; 2nd param: addr. of function parameters
; save a few registers (it is not necessary to save them all
; and EAX should *not* be saved because it will hold the return
; value)
push ebp
push esi
push edi
; push the parameters
push edx
push eax
call ebx ; direct call
_DROPARGS 8 ; remove arguments from stack
pop edi ; restore saved registers
pop esi
pop ebp
mov eax,[ebp+_error]
_CHKABORT eax
; function result is in eax (PRI)
mov edx,alt ; restore ALT
mov ebx,frm
mov ecx,stk ; restore STK
add ebx,edi ; restore FRM
GO_ON
OP_FILE:
jmp OP_INVALID
OP_LINE:
add esi,12
GO_ON
OP_SYMBOL:
add esi,[esi+4]
add esi,8 ; skip "fixed" part
GO_ON
OP_SRANGE:
add esi,12
GO_ON
OP_SYMTAG:
add esi,8
GO_ON
OP_JUMP_PRI:
mov esi,eax
GO_ON
OP_SWITCH:
push ecx
mov ebp,[esi+4] ; get offset of the switch table
add ebp,4 ; skip the "OP_CASETBL" opcode
mov ecx,[ebp] ; ECX = number of records
mov esi,[ebp+4] ; preset ESI to "none-matched" case
op_switch_loop:
or ecx, ecx ; number of records == 0?
jz short op_switch_end ; yes, no more records, exit loop
add ebp,8 ; skip previous record
dec ecx ; already decrement cases to do
cmp eax,[ebp] ; PRI == case label?
jne short op_switch_loop ; no, continue loop
mov esi,[ebp+4] ; yes, get jump address and exit loop
op_switch_end:
pop ecx
GO_ON
OP_CASETBL:
jmp OP_INVALID
OP_SWAP_PRI:
mov ebp,[edi+ecx]
add esi,4
mov [edi+ecx],eax
mov eax,ebp
GO_ON
OP_SWAP_ALT:
mov ebp,[edi+ecx]
add esi,4
mov [edi+ecx],edx
mov edx,ebp
GO_ON
OP_PUSHADDR:
mov ebp,[esi+4]
add esi,8
add ebp,frm
_PUSH ebp
GO_ON
OP_NOP:
add esi,4
GO_ON
OP_FLOAT_MUL:
add esi,4
fld dword [edi+ecx+4]
fmul dword [edi+ecx+8]
sub esp,4
fstp dword [esp]
pop eax
GO_ON
OP_FLOAT_DIV:
add esi,4
fld dword [edi+ecx+4]
fdiv dword [edi+ecx+8]
sub esp,4
fstp dword [esp]
pop eax
GO_ON
OP_FLOAT_ADD:
add esi,4
fld dword [edi+ecx+4]
fadd dword [edi+ecx+8]
sub esp,4
fstp dword [esp]
pop eax
GO_ON
OP_FLOAT_SUB:
add esi,4
fld dword [edi+ecx+4]
fsub dword [edi+ecx+8]
sub esp, 4
fstp dword [esp]
pop eax
GO_ON
OP_FLOAT_TO:
add esi,4
fild dword [edi+ecx+4]
sub esp,4
fstp dword [esp]
pop eax
GO_ON
OP_FLOAT_ROUND:
add esi,4
;get the float control word
push 0
mov ebp,esp
fstcw [ebp]
mov eax,[ebp]
push eax
;clear the top bits
xor ah,ah
;get the control method
push edx
mov edx,[edi+ecx+8]
and edx,3 ;sanity check
shl edx,2 ;shift it to right position
;set the bits
or ah,dl ;set bits 15,14 of FCW to rounding method
or ah,3 ;set precision to 64bit
mov [ebp], eax
fldcw [ebp]
;calculate
push 0
fld dword [edi+ecx+4]
frndint
fistp dword [esp]
pop eax
pop edx
;restore bits
pop ebp
mov [esp], ebp
fldcw [esp]
pop ebp
GO_ON
OP_FLOAT_CMP:
add esi, 4
fld dword [edi+ecx+8]
fld dword [edi+ecx+4]
fucompp
fnstsw ax
fwait
sahf
cmovz eax, [g_flags+4]
cmova eax, [g_flags+8]
cmovb eax, [g_flags+0]
GO_ON
OP_BREAK:
mov ebp,amx ; get amx into ebp
add esi,4
cmp DWORD [ebp+_debug], 0
jnz break_calldebug
GO_ON ; debug hook not active, ignore
break_calldebug:
; store the status in the AMX (FRM, STK, HEA, CIP, and PRI + ALT)
mov [ebp+_pri],eax
mov [ebp+_alt],edx ; EAX and EDX are now free to use
mov eax,frm
mov edx,hea
mov [ebp+_frm],eax ; store values in AMX structure (STK, FRM & HEA)
mov [ebp+_hea],edx
mov [ebp+_stk],ecx
mov eax,esi
sub eax,code ; EAX = CIP (relative to start of code segment)
mov [ebp+_cip],eax
; call the debug hook
mov eax,ebp ; 1st parm: amx
_SAVEREGS
push eax
call [ebp+_debug] ; call debug function
_DROPARGS 4 ; remove arguments from stack
cmp eax,AMX_ERR_NONE
je short break_noabort; continue running
mov [ebp+_error],eax ; save EAX (error code) before restoring all regs
_RESTOREREGS ; abort run, but restore stack first
mov eax,[ebp+_error] ; get error code in EAX back again
_FASTABORT
break_noabort:
_RESTOREREGS
mov eax,[ebp+_pri] ; restore PRI and ALT
mov edx,[ebp+_alt]
GO_ON
OP_INVALID:
_ABORT AMX_ERR_INVINSTR
err_call:
_ABORT AMX_ERR_CALLBACK
err_stack:
_ABORT AMX_ERR_STACKERR
err_stacklow:
_ABORT AMX_ERR_STACKLOW
err_memaccess:
_ABORT AMX_ERR_MEMACCESS
err_bounds:
_ABORT AMX_ERR_BOUNDS
err_heaplow:
_ABORT AMX_ERR_HEAPLOW
err_divide:
_ABORT AMX_ERR_DIVIDE
_return:
; save a few parameters, mostly for the "sleep"function
mov ebp,amx ; get amx into ebp
mov [ebp+_cip],esi ; get corrected cip for amxmodx
mov eax,[ebp+_error]; get error code
pop esi ; remove FRM from stack
pop ecx
pop ebx
pop edx
pop esi ; remove pointer to amx from stack
pop esi ; remove code segment pointer
pop esi ; remove code size
add esp,4*3 ; place for PRI, ALT & STK at SYSREQs
pop ebp
pop esi
pop edi
pop ebx
ret
; _amx_exec_asm ENDP
Start_DATA
ALIGN 4 ; This is essential to avoid misalignment stalls.
lodb_and DD 0ffh, 0ffffh, 0, 0ffffffffh
GLOBAL g_flags
g_flags:
DD -1
DD 0
DD 1
GLOBAL amx_opcodelist
GLOBAL _amx_opcodelist
amx_opcodelist:
_amx_opcodelist DD OP_INVALID
DD OP_LOAD_PRI
DD OP_LOAD_ALT
DD OP_LOAD_S_PRI
DD OP_LOAD_S_ALT
DD OP_LREF_PRI
DD OP_LREF_ALT
DD OP_LREF_S_PRI
DD OP_LREF_S_ALT
DD OP_LOAD_I
DD OP_LODB_I
DD OP_CONST_PRI
DD OP_CONST_ALT
DD OP_ADDR_PRI
DD OP_ADDR_ALT
DD OP_STOR_PRI
DD OP_STOR_ALT
DD OP_STOR_S_PRI
DD OP_STOR_S_ALT
DD OP_SREF_PRI
DD OP_SREF_ALT
DD OP_SREF_S_PRI
DD OP_SREF_S_ALT
DD OP_STOR_I
DD OP_STRB_I
DD OP_LIDX
DD OP_LIDX_B
DD OP_IDXADDR
DD OP_IDXADDR_B
DD OP_ALIGN_PRI
DD OP_ALIGN_ALT
DD OP_LCTRL
DD OP_SCTRL
DD OP_MOVE_PRI
DD OP_MOVE_ALT
DD OP_XCHG
DD OP_PUSH_PRI
DD OP_PUSH_ALT
DD OP_PUSH_R_PRI
DD OP_PUSH_C
DD OP_PUSH
DD OP_PUSH_S
DD OP_POP_PRI
DD OP_POP_ALT
DD OP_STACK
DD OP_HEAP
DD OP_PROC
DD OP_RET
DD OP_RETN
DD OP_CALL
DD OP_CALL_PRI
DD OP_JUMP
DD OP_JREL
DD OP_JZER
DD OP_JNZ
DD OP_JEQ
DD OP_JNEQ
DD OP_JLESS
DD OP_JLEQ
DD OP_JGRTR
DD OP_JGEQ
DD OP_JSLESS
DD OP_JSLEQ
DD OP_JSGRTR
DD OP_JSGEQ
DD OP_SHL
DD OP_SHR
DD OP_SSHR
DD OP_SHL_C_PRI
DD OP_SHL_C_ALT
DD OP_SHR_C_PRI
DD OP_SHR_C_ALT
DD OP_SMUL
DD OP_SDIV
DD OP_SDIV_ALT
DD OP_UMUL
DD OP_UDIV
DD OP_UDIV_ALT
DD OP_ADD
DD OP_SUB
DD OP_SUB_ALT
DD OP_AND
DD OP_OR
DD OP_XOR
DD OP_NOT
DD OP_NEG
DD OP_INVERT
DD OP_ADD_C
DD OP_SMUL_C
DD OP_ZERO_PRI
DD OP_ZERO_ALT
DD OP_ZERO
DD OP_ZERO_S
DD OP_SIGN_PRI
DD OP_SIGN_ALT
DD OP_EQ
DD OP_NEQ
DD OP_LESS
DD OP_LEQ
DD OP_GRTR
DD OP_GEQ
DD OP_SLESS
DD OP_SLEQ
DD OP_SGRTR
DD OP_SGEQ
DD OP_EQ_C_PRI
DD OP_EQ_C_ALT
DD OP_INC_PRI
DD OP_INC_ALT
DD OP_INC
DD OP_INC_S
DD OP_INC_I
DD OP_DEC_PRI
DD OP_DEC_ALT
DD OP_DEC
DD OP_DEC_S
DD OP_DEC_I
DD OP_MOVS
DD OP_CMPS
DD OP_FILL
DD OP_HALT
DD OP_BOUNDS
DD OP_SYSREQ_PRI
DD OP_SYSREQ_C
DD OP_FILE
DD OP_LINE
DD OP_SYMBOL
DD OP_SRANGE
DD OP_JUMP_PRI
DD OP_SWITCH
DD OP_CASETBL
DD OP_SWAP_PRI
DD OP_SWAP_ALT
DD OP_PUSHADDR
DD OP_NOP
DD OP_SYSREQ_D
DD OP_SYMTAG
DD OP_BREAK
DD OP_FLOAT_MUL
DD OP_FLOAT_DIV
DD OP_FLOAT_ADD
DD OP_FLOAT_SUB
DD OP_FLOAT_TO
DD OP_FLOAT_ROUND
DD OP_FLOAT_CMP
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