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report memory violations in debug mode

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This commit is contained in:
Ludwig Nussel 2009-11-01 19:58:21 +00:00
parent 4722d311fd
commit da31866f6d
1 changed files with 19 additions and 10 deletions
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29
code/qcommon/vm_x86_64.c
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@ -320,18 +320,19 @@ void emit(const char* fmt, ...)
emit(op " %%cl, %%eax"); \
emit("movl %%eax, 0(%%rsi)");
#if 1
#ifdef DEBUG_VM
#define RANGECHECK(reg, bytes) \
emit("movl %%" #reg ", %%ecx"); \
emit("andl $0x%x, %%ecx", vm->dataMask &~(bytes-1)); \
emit("cmpl %%" #reg ", %%ecx"); \
emit("jz rc_ok_i_%08x", instruction); \
emit("movq $%lu, %%rax", (unsigned long)memviolation); \
emit("callq *%%rax"); \
emit("rc_ok_i_%08x:", instruction);
#elif 1
// check is too expensive, so just confine memory access
#define RANGECHECK(reg, bytes) \
emit("andl $0x%x, %%" #reg, vm->dataMask &~(bytes-1));
#elif 0
#define RANGECHECK(reg, bytes) \
emit("pushl %%" #reg); \
emit("andl $0x%x, %%" #reg, ~vm->dataMask); \
emit("jz rangecheck_ok_i_%08x", instruction); \
emit("int3"); \
emit("rangecheck_ok_i_%08x:", instruction); \
emit("popl %%" #reg); \
emit("andl $0x%x, %%" #reg, vm->dataMask);
#else
#define RANGECHECK(reg, bytes)
#endif
@ -370,6 +371,14 @@ static void eop(void)
exit(1);
}
#ifdef DEBUG_VM
static void memviolation(void)
{
Com_Error(ERR_DROP, "program tried to access memory outside VM\n");
exit(1);
}
#endif
/*
=================
VM_Compile