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add gecko-jump.s

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sup39 2022-11-11 17:14:11 +09:00
parent f91e14d72f
commit ec08a449ad
2 changed files with 30 additions and 1 deletions
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2
ReadFile.c
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@ -44,7 +44,7 @@ int onReadOptionBlock(TCardManager *this, CARDFileInfo *fileInfo) {
} else {
// everything is good => apply gecko code
// TODO entry
((void(*)())0x817f0000)();
((void(*)())0x817f4000)();
}
// close file

29
gecko-jump.s Normal file
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@ -0,0 +1,29 @@
.set gpApplication, 0x803e6000 # TODO version
.set dst, 0x817fb000
## TODO prevent softlock: check app state >= 4
lis r5, gpApplication+8@ha
lbz r5, gpApplication+8@l(r5)
cmplwi r5, 4
bltlr
## r5 = 00D0C0DE
lis r5, 0x00D0
ori r5, r5, 0xC0DE
## check if code is loaded (check header)
lis r3, dst@ha
### first 00D0C0DE
### r3 = &dst
lwzu r0, dst@l(r3)
cmplw r0, r5
bnelr
### second 00D0C0DE
lwz r0, 4(r3)
cmplw r0, r5
bnelr
## backup r15 (pointer to current gecko instruction) at dst-4
add r0, r15, r4
stw r0, -4(r3)
## update r15 = dst + 8(header) - r4(this C0 code size)
addi r15, r3, 8
sub r15, r15, r4
blr