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fix bounds on ep3 patch handler code copy

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This commit is contained in:
Martin Michelsen
2022-11-03 00:40:51 -07:00
parent 10ab632c59
commit 247904f019
1 changed files with 2 additions and 2 deletions
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system/ppc/Episode3USAQuestBufferOverflow.s
+2 -2
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@@ -262,11 +262,11 @@ get_handle_B2_end_ptr:
# Copy handle_B2 to 8000BD80, which is normally unused by the game # Copy handle_B2 to 8000BD80, which is normally unused by the game
lis r12, 0x8000 lis r12, 0x8000
ori r12, r12, 0xBD80 # r12 = 0x8000BD80 ori r12, r12, 0xBD80 # r12 = 0x8000BD80
subi r8, r12, 4 # r8 = r12 - 4 (so we can use stwu)
subi r9, r9, 4 # r9 = r9 - 4 (so we can use lwzu)
sub r7, r10, r9 sub r7, r10, r9
rlwinm r7, r7, 30, 2, 31 # r7 = number of words to copy rlwinm r7, r7, 30, 2, 31 # r7 = number of words to copy
mtctr r7 mtctr r7
subi r8, r12, 4 # r8 = r12 - 4 (so we can use stwu)
subi r9, r9, 4 # r9 = r9 - 4 (so we can use lwzu)
copy_handle_B2_word_again: copy_handle_B2_word_again:
lwzu r0, [r9 + 4] lwzu r0, [r9 + 4]
stwu [r8 + 4], r0 stwu [r8 + 4], r0