diff options
Diffstat (limited to 'docs/codehandler.s')
| -rw-r--r-- | docs/codehandler.s | 132 |
1 files changed, 72 insertions, 60 deletions
diff --git a/docs/codehandler.s b/docs/codehandler.s index 0582fe124a..8cf8a9e2ac 100644 --- a/docs/codehandler.s +++ b/docs/codehandler.s @@ -43,6 +43,8 @@ cheatdata: .long frozenvalue .space 39*4 +# Warning, _strip_and_align expects cheat codes to start on 0x0 or 0x8. +# Properly compiling it will add a nop if needed. _start: stwu r1,-172(r1) # stores sp stw r0,8(r1) # stores r0 @@ -150,7 +152,7 @@ _readcodes: andis. r11,r3,0x1000 #test pointer rlwinm r3,r3,0,7,31 #r3 = extract address in r3 (code type 0/1/2) #0x01FFFFFF - + bne +12 #jump lf the pointer is used rlwinm r12,r6,0,0,6 #lf pointer is not used, address = base address @@ -178,6 +180,33 @@ _readcodes: b _terminator_onoff_ #code type 7 : End of code list + _Write_32: + lwz r18, 0(r12) #Load data from registry that will be written to + cmpw r18, r5 #Is data to be written equal to the data in memory + beq+ +72 #Skip if yes + stw r5, 0(r12) #store opcode + li r9, 0 #safe, check r9 if more write_32's are linked. + b +48 + +_Write_08x: + lbzx r18, r9, r12 + rlwinm r0, r4, 0, 24,31 #Clears any other data with r4's byte, for compare + cmpw r0, r18 + beq+ +44 + stbx r4,r9,r12 + b +24 + +_Write_16x: + lhzx r18, r9, r12 + rlwinm r0, r4, 0, 16,31 #Makes sure r4 is just a halfword for compare + cmpw r0, r18 + beq+ +20 + sthx r4,r9,r12 + icbi r9, r12 #branch target. Clears cache. Need dcbf? + sync + isync + blr + #CT0============================================================================= #write 8bits (0): 00XXXXXX YYYY00ZZ #write 16bits (1): 02XXXXXX YYYYZZZZ @@ -201,45 +230,34 @@ _write: rlwinm r10,r4,16,16,31 #r10 = extract number of times to write (16bits value) _write816: - beq cr4,+32 #lf r5 = 1 then 16 bits write - stbx r4,r9,r12 #write byte - add r21, r9, r12 - icbi r0, r21 - sync - isync + beq cr4,+16 #lf r5 = 1 then 16 bits write + bl _Write_08x addi r9,r9,1 - b +28 - sthx r4,r9,r12 #write halfword - add r21, r9, r12 #Get Real Memory Offset - icbi r0, r21 #Invalidate Icache around real memory offset - sync - isync - addi r9,r9,2 + b +12 + bl _Write_16x + addi r9, r9, 2 subic. r10,r10,1 #number of times to write -1 bge- _write816 b _readcodes _write32: rlwinm r12,r12,0,0,29 #32bits align adress - stw r4,0(r12) #write word to address - icbi r0, r12 #Invalidate icache around address - sync - isync + mr r5, r4 + bl _Write_32 b _readcodes _write_string: #endianess ? mr r9,r4 + mr r22, r4 bne- cr7,_skip_and_align #lf code execution is false, skip string code data _stb: subic. r9,r9,1 #r9 -= 1 (and compares r9 with 0) blt- _skip_and_align #lf r9 < 0 then exit lbzx r5,r9,r15 - stbx r5,r9,r12 #loop until all the data has been written - add r21, r9, r12 #Get Real Memory Offset - icbi r0, r21 #Invalidate Icache around real memory offset - sync - isync + mr r4, r5 + bl _Write_08x #loop until all the data has been written + mr r4, r22 b _stb _write_serial: @@ -259,15 +277,17 @@ _loop_serial: beq- cr5,+16 #lf 16bits bgt+ cr5,+20 #lf 32bits - stbx r4,r9,r12 #write serial byte (CT04,T=0) - b +16 - - sthx r4,r9,r12 #write serial halfword (CT04,T=1) - b +8 + bl _Write_08x + b +40 + bl _Write_16x #write serial halfword (CT04,T=1) + b +32 + + lwzx r18, r9, r12 + cmpw r4, r18 + beq+ +20 stwx r4,r9,r12 #write serial word (CT04,T>=2) - add r21, r9, r12 #Get Real Memory Offset - icbi r0, r21 #Invalidate Icache around real memory offset + icbi r9, r12 #Invalidate Icache around real memory offset sync isync add r4,r4,r11 #value +=VVVVVVVV @@ -560,35 +580,36 @@ _load: bgt+ cr6,+24 beq- cr6,+12 - lbz r4,0(r4) #load byte at address + lbz r4,0(r12) #load byte at address b _store_reg - lhz r4,0(r4) #load halfword at address + lhz r4,0(r12) #load halfword at address b _store_reg - lwz r4,0(r4) #load word at address + lwz r4,0(r12) #load word at address b _store_reg _store: rlwinm r19,r3,28,20,31 #r9=r3 ror 12 (N84UYZZZ) - + + mr r12, r4 + mr r4, r9 + mr r5, r9 + li r9, 0 _storeloop: bgt+ cr6,+32 beq- cr6,+16 - stb r9,0(r4) #store byte at address - addi r4,r4,1 + bl _Write_08x #store byte at address + addi r12,r12,1 b _storeloopend - sth r9,0(r4) #store byte at address - addi r4,r4,2 + bl _Write_16x #store byte at address + addi r12,r12,2 b _storeloopend - stw r9,0(r4) #store byte at address - icbi r0, r4 #Invalidate at offset given by storing gecko register - sync - isync - addi r4,r4,4 + bl _Write_32 + addi r12,r12,4 _storeloopend: subic. r19,r19,1 bge _storeloop @@ -793,14 +814,14 @@ _compare16_counter: b _conditional #=============================================================================== -#execute (0) : C0000000 NNNNNNNN = execute -#hook1 (2) : C4XXXXXX NNNNNNNN = insert instructions at XXXXXX +#execute (0) : C0000000 NNNNNNNN = execute. End with 4E800020 00000000. +#hook1 (2) : C4XXXXXX NNNNNNNN = insert instructions at XXXXXX. Same as C2. #hook2 (3) : C6XXXXXX YYYYYYYY = branch from XXXXXX to YYYYYY #on/off (6) : CC000000 00000000 = on/off switch #range check (7) : CE000000 XXXXYYYY = is ba/po in XXXX0000-YYYY0000 _hook_execute: - mr r26,r4 #r18 = 0YYYYYYY + mr r26,r4 #r26 = 0YYYYYYY rlwinm r4,r4,3,0,28 #r4 = NNNNNNNN*8 = number of lines (and not number of bytes) bne- cr4,_hook_addresscheck #lf sub code type != 0 bne- cr7,_skip_and_align @@ -815,7 +836,6 @@ _skip_and_align: rlwinm r15,r15,0,0,28 #align 64-bit b _readcodes - _hook_addresscheck: cmpwi cr4,r5,3 @@ -834,10 +854,7 @@ _hook2: sub r4,r4,r12 #r4 = to-from rlwimi r5,r4,0,6,29 #r5 = (r4 AND 0x03FFFFFC) OR 0x48000000 rlwimi r5,r3,0,31,31 #restore lr bit - stw r5,0(r12) #store opcode - icbi r0, r12 #Invalidate at branch - sync - isync + bl _Write_32 b _readcodes _hook1: @@ -845,19 +862,14 @@ _hook1: sub r9,r15,r12 #r9 = to-from rlwimi r5,r9,0,6,29 #r5 = (r9 AND 0x03FFFFFC) OR 0x48000000 - stw r5,0(r12) #stores b at the hook place (over original instruction) - icbi r0, r12 #Invalidate at hook location - sync - isync + bl _Write_32 addi r12,r12,4 add r11,r15,r4 subi r11,r11,4 #r11 = address of the last word of the hook1 code sub r9,r12,r11 rlwimi r5,r9,0,6,29 #r5 = (r9 AND 0x03FFFFFC) OR 0x48000000 - stw r5,0(r11) #stores b at the last word of the hook1 code - icbi r0, r12 #Invalidate at last instruction of hook - sync - isync + mr r12, r11 + bl _Write_32 b _skip_and_align _addresscheck1: @@ -1045,4 +1057,4 @@ regbuffer: codelist: .space 2*4 -.end +.end
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