Merge pull request #6349 from booto/codehandler
Update codehandler to stash registers that may get clobbered
This commit is contained in:
Jules Blok
GitHub
commit
51d3de6787
Binary file not shown.
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@ -0,0 +1,7 @@
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OUTPUT_FORMAT(binary)
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OUTPUT(codehandler.bin)
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SECTIONS
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{
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. = 0x80001800;
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.text : { *(.text) }
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}
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@ -21,6 +21,8 @@
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#SOFTWARE.
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# Based off of codehandleronly.s from Gecko OS source code.
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# Example command to build:
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# powerpc-elf-gcc -mpowerpc -mpaired -mbig codehandler.s -nostartfiles -nodefaultlibs -nostdlib -T codehandler.ld -o codehandler.bin
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.text
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#Register Defines
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@ -42,11 +44,11 @@ cheatdata:
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.space 39*4
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_start:
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stwu r1,-168(r1) # stores sp
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stwu r1,-172(r1) # stores sp
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stw r0,8(r1) # stores r0
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mflr r0
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stw r0,172(r1) # stores lr
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stw r0,176(r1) # stores lr
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mfcr r0
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stw r0,12(r1) # stores cr
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@ -60,28 +62,27 @@ _start:
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stmw r3,24(r1) # saves r3-r31
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mfmsr r25
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stw r25,168(r1) # save msr
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ori r26,r25,0x2000 #enable floating point ?
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andi. r26,r26,0xF9FF
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mtmsr r26
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stfd f2,152(r1) # stores f2
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stfd f3,160(r1) # stores f3
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lis r31,_start@h #0x8000
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lis r31,cheatdata@h #0x8000
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lis r20, 0xCC00
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lhz r28, 0x4010(r20)
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ori r21, r28, 0xFF
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sth r21, 0x4010(r20) # disable MP3 memory protection
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mflr r29
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lis r15, codelist@h
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ori r15, r15, codelist@l
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ori r7, 31, cheatdata@l # set pointer for storing data (before the codelist)
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ori r7, r31, cheatdata@l # set pointer for storing data (before the codelist)
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lis r6,0x8000 # default base address = 0x80000000 (code handler)
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@ -100,18 +101,17 @@ _start:
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bne- _exitcodehandler # lf no code list skip code handler
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addi r15,r15,8
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b _readcodes
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_exitcodehandler:
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mtlr r29
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resumegame:
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_exitcodehandler:
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sth r28,0x4010(r20) # restore memory protection value
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lfd f2,152(r1) # loads f2
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lfd f3,160(r1) # loads f3
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lwz r25,168(r1)
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mtmsr r25
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lwz r0,172(r1)
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lwz r0,176(r1)
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mtlr r0 # restores lr
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lwz r0,12(r1)
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@ -127,7 +127,7 @@ resumegame:
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lwz r0,8(r1) # loads r0
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addi r1,r1,168
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addi r1,r1,172
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isync
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@ -158,7 +158,6 @@ _readcodes:
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mr r12,r16 #lf pointer is used, address = pointer
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cmpwi cr4,r5,0 #compares sub code type with 0 in cr4
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cmpwi r10,1
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@ -232,7 +231,6 @@ _write_string: #endianess ?
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mr r9,r4
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bne- cr7,_skip_and_align #lf code execution is false, skip string code data
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_stb:
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subic. r9,r9,1 #r9 -= 1 (and compares r9 with 0)
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blt- _skip_and_align #lf r9 < 0 then exit
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@ -256,7 +254,6 @@ _write_serial:
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rlwinm r10,r5,16,20,31 #r10 = NNN (# of times to write -1)
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rlwinm r5,r5,4,28,31 #r5 = T (0:8bits/1:16bits/2:32bits)
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_loop_serial:
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cmpwi cr5,r5,1
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beq- cr5,+16 #lf 16bits
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@ -303,8 +300,6 @@ _conditional:
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bgt cr3,_addresscheck2 #lf code type==6 -> address check
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add r12,r12,r3 #address = (ba/po)+(XXXXXX)
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blt cr3,+12 #jump lf code type <5 (==1)
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blt cr5,_condition_sub #compare [rN][rM]
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b _conditional16_2 #counter compare
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@ -347,7 +342,6 @@ _skip_LE:#2
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_skip_GE:#3
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blt- cr6,_true_end #CT23, CT27, CT2B or CT2F (lf r4<r4)
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_skip:
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ori r8,r8,1 #r8|=1 (execution status set to false)
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_true_end:
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@ -360,7 +354,6 @@ _true_end:
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andi. r12,r8,0x1 #else lf.. code result true clear counter
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beq _clearcounter
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_increase_counter:
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addi r12,r11,0x10 #else increase the counter
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rlwimi r11,r12,0,12,27 #update counter
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@ -372,7 +365,6 @@ _savecounter:
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stw r11,-8(r15) #save counter
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b _readcodes
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#CT2============================================================================
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#load base adress (0): 40TYZ00N XXXXXXXX = (load/add:T) ba from [(ba/po:Y)+XXXXXXXX(+rN:Z)]
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@ -392,7 +384,6 @@ _ba_pointer:
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bne- cr7,_readcodes
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rlwinm r9,r3,2,26,29 #r9 = extract N, makes N*4
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rlwinm r14,r3,16,31,31 #r3 = add ba/po flag bit (Y)
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@ -423,7 +414,6 @@ _p01:
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add r4,r12,r4 #address = XXXXXXXX (+rN) + (ba/po)
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cmpwi cr5,r14,1
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beq cr5,+8 #address = (ba/po)+XXXXXXXX(+rN)
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lwz r4,0(r4) #address = [(ba/po)+XXXXXXXX(+rN)]
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@ -436,8 +426,6 @@ _p01:
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add r4,r4,r16 #po += XXXXXXXX (+rN) + (ba/po)
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b _pend
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_p2:
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rlwinm. r5,r3,20,31,31 #r3 = rN use bit (Z)
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beq +12 #flag is not set(=0), address = XXXXXXXX
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@ -451,7 +439,6 @@ _p2:
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stwx r16,r12,r4 #[(ba/po)+XXXXXXXX] = pointer
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b _readcodes
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_pend:
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bge cr4,+12
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mr r6,r4 #store result to base address
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@ -459,7 +446,6 @@ _pend:
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mr r16,r4 #store result to pointer
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b _readcodes
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#CT3============================================================================
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#set repeat (0): 6000ZZZZ 0000000P = set repeat
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#execute repeat (1): 62000000 0000000P = execute repeat
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@ -482,7 +468,6 @@ _repeat_goto:
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beq- cr7,_readcodes #S=1, skip lf false, don't skip lf true
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b _b_bl_blr_nocheck
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_b_bl_blr:
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bne- cr7,_readcodes #lf code execution set to false skip code
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@ -505,8 +490,6 @@ _b:
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add r15,r15,r4 #next code address +/-=line XXXX
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b _readcodes
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_repeat:
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bne- cr7,_readcodes #lf code execution set to false skip code
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@ -547,7 +530,6 @@ _execute_repeat:
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_operation_rN:
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bne- cr7,_readcodes
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rlwinm r11,r3,2,26,29 #r11 = extract N, makes N*4
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@ -564,7 +546,6 @@ _operation_rN:
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cmpwi cr4,r5,3
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bge- cr4,_op34 #lf sub code type = 3/4
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cmpwi cr4,r5,1
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_op12: #load/store
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@ -589,7 +570,6 @@ _load:
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b _store_reg
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_store:
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rlwinm r19,r3,28,20,31 #r9=r3 ror 12 (N84UYZZZ)
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_storeloop:
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@ -614,26 +594,17 @@ _storeloopend:
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bge _storeloop
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b _readcodes
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_op0:
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rlwinm. r5,r3,16,31,31 #+(ba/po) flag : Y
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beq +8 #value = XXXXXXXX
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add r4,r4,r12 #value = XXXXXXXX+(ba/po)
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andi. r5,r14,1 #add flag : S
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beq _store_reg #add flag not set (=0), rN=value
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add r4,r4,r9 #add flag set (=1), rN=rN+value
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b _store_reg
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_op34: #operation 1 & 2
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rlwinm r10,r3,16,30,31 #extracts Y
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rlwinm r14,r4,2,26,29 #r14 = extract M (in r4), makes M*=4
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@ -642,32 +613,25 @@ _op34: #operation 1 & 2
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bne cr4,+8
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subi r19,r15,4 #lf CT3, 2nd value address = XXXXXXXX's address
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lwz r4,0(r26) #1st value = rN
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lwz r9,0(r19) #2nd value = rM/XXXXXXXX
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andi. r11,r10,1 #lf [] for 1st value
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beq +8
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mr r26,r4
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andi. r11,r10,2 #lf [] for 2nd value
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beq +16
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mr r19,r9
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bne+ cr4,+8
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add r19,r12,r19 #lf CT3, 2nd value address = XXXXXXXX+(ba/op)
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rlwinm. r5,r3,12,28,31 #operation # flag : T
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cmpwi r5,9
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bge _op_float
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_operation_bl:
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bl _operation_bl_return
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@ -741,7 +705,6 @@ _operation_bl_return:
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mtlr r10
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blr
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#copy1 (5) : 8AYYYYNM XXXXXXXX = copy YYYY bytes from [rN] to ([rM]+)XXXXXXXX
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#copy2 (6) : 8CYYYYNM XXXXXXXX = copy YYYY bytes from ([rN]+)XXXXXX to [rM]
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@ -769,8 +732,6 @@ _op56:
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cmpw r5,r4
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b _copy_loop
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#===============================================================================
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#This is a routine called by _memory_copy and _compare_NM_16
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@ -796,7 +757,6 @@ _load_NM:
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beq cr5,+8
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lhz r9,0(r9) #...and lf CT5 then M = 16 bits at [XXXXXX+base address]
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blr
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#CT5============================================================================
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@ -828,7 +788,6 @@ _compare16_NM:
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b _conditional
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_compare16_counter:
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rlwinm r11,r3,28,16,31 #extract counter value from r3 in r11
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b _conditional
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@ -867,7 +826,6 @@ _hook_addresscheck:
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bne- cr4,_hook1 #lf sub code type ==2
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_hook2:
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bne- cr7,_readcodes
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@ -902,7 +860,6 @@ _hook1:
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isync
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b _skip_and_align
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_addresscheck1:
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cmpwi cr4,r5,6
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beq cr4,_onoff
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@ -918,7 +875,6 @@ _addresscheck2:
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bge _skip
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b _readcodes
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_onoff:
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rlwinm r5,r26,31,31,31 #extracts old exec status (x b a)
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xori r5,r5,1
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@ -927,18 +883,13 @@ _onoff:
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beq _onoff_end
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rlwimi r26,r8,1,30,30
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xori r26,r26,2
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rlwinm. r5,r26,31,31,31 #extracts b
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beq +8
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xori r26,r26,1
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stw r26,-4(r15) #updates the code value in the code list
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_onoff_end:
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rlwimi r8,r26,0,31,31 #current execution status = a
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@ -1095,5 +1046,3 @@ regbuffer:
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codelist:
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.space 2*4
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.end
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