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Add stack check to pcall/xpcall.

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Analyzed by Peter Cawley. #1048
This commit is contained in:
Mike Pall
2023-11-12 14:42:24 +01:00
parent 65c8493907
commit a4c1640432
5 changed files with 38 additions and 1 deletions
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8
src/vm_ppc.dasc
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@@ -1537,8 +1537,12 @@ static void build_subroutines(BuildCtx *ctx)
|//-- Base library: catch errors ----------------------------------------
|
|.ffunc pcall
| lwz TMP1, L->maxstack
| add TMP2, BASE, NARGS8:RC
| cmplwi NARGS8:RC, 8
| lbz TMP3, DISPATCH_GL(hookmask)(DISPATCH)
| cmplw cr1, TMP1, TMP2
| cror 4*cr0+lt, 4*cr0+lt, 4*cr1+lt
| blt ->fff_fallback
| mr TMP2, BASE
| la BASE, 8(BASE)
@@ -1549,9 +1553,13 @@ static void build_subroutines(BuildCtx *ctx)
| b ->vm_call_dispatch
|
|.ffunc xpcall
| lwz TMP1, L->maxstack
| add TMP2, BASE, NARGS8:RC
| cmplwi NARGS8:RC, 16
| lwz CARG4, 8(BASE)
| cmplw cr1, TMP1, TMP2
| lfd FARG2, 8(BASE)
| cror 4*cr0+lt, 4*cr0+lt, 4*cr1+lt
| lfd FARG1, 0(BASE)
| blt ->fff_fallback
| lbz TMP1, DISPATCH_GL(hookmask)(DISPATCH)