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Additional check for bad stack offset calculation

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Pointer difference calculations on an inappropriate stack pointer could
result in a negative offset, not just an offset that is too large to fit
in 16 bits.  Complain if either case occurs.
This commit is contained in:
Nick Briggs
2024-03-07 10:01:19 -08:00
parent 55591557b6
commit 939c23c03b
1 changed files with 2 additions and 2 deletions
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4
inc/adr68k.h
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@@ -63,8 +63,8 @@ static inline DLword StackOffsetFromNative(void *SAddr)
{ {
/* Stack offsets are expressed as an offset in DLwords from the stack base */ /* Stack offsets are expressed as an offset in DLwords from the stack base */
ptrdiff_t hoffset = (DLword *)SAddr - Stackspace; ptrdiff_t hoffset = (DLword *)SAddr - Stackspace;
if (hoffset > 0xffff) { if (hoffset > 0xffff || hoffset < 0) {
printf("Stack offset is too large: 0x%tx\n", hoffset); printf("Stack offset is out of range: 0x%tx\n", hoffset);
} }
return (DLword)hoffset; return (DLword)hoffset;
} }