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better range checks

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This commit is contained in:
Ludwig Nussel 2009-11-01 19:58:18 +00:00
parent b7eae0dca5
commit 4722d311fd
1 changed files with 12 additions and 12 deletions
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24
code/qcommon/vm_x86_64.c
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@ -321,10 +321,10 @@ void emit(const char* fmt, ...)
emit("movl %%eax, 0(%%rsi)");
#if 1
#define RANGECHECK(reg) \
emit("andl $0x%x, %%" #reg, vm->dataMask);
#define RANGECHECK(reg, bytes) \
emit("andl $0x%x, %%" #reg, vm->dataMask &~(bytes-1));
#elif 0
#define RANGECHECK(reg) \
#define RANGECHECK(reg, bytes) \
emit("pushl %%" #reg); \
emit("andl $0x%x, %%" #reg, ~vm->dataMask); \
emit("jz rangecheck_ok_i_%08x", instruction); \
@ -333,7 +333,7 @@ void emit(const char* fmt, ...)
emit("popl %%" #reg); \
emit("andl $0x%x, %%" #reg, vm->dataMask);
#else
#define RANGECHECK(reg)
#define RANGECHECK(reg, bytes)
#endif
#ifdef DEBUG_VM
@ -474,7 +474,6 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
case OP_ENTER:
MAYBE_EMIT_CONST();
emit("subl $%d, %%edi", iarg);
RANGECHECK(edi);
break;
case OP_LEAVE:
MAYBE_EMIT_CONST();
@ -485,6 +484,7 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
MAYBE_EMIT_CONST();
emit("movl 0(%%rsi), %%eax"); // get instr from stack
emit("subq $4, %%rsi");
RANGECHECK(edi, 4);
emit("movl $%d, 0(%%r8, %%rdi, 1)", instruction+1); // save next instruction
emit("orl %%eax, %%eax");
emit("jl callSyscall%d", instruction);
@ -629,7 +629,7 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
case OP_LOAD1:
MAYBE_EMIT_CONST();
emit("movl 0(%%rsi), %%eax"); // get value from stack
RANGECHECK(eax);
RANGECHECK(eax, 1);
emit("movb 0(%%r8, %%rax, 1), %%al"); // deref into eax
emit("andq $255, %%rax");
emit("movl %%eax, 0(%%rsi)"); // store on stack
@ -637,14 +637,14 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
case OP_LOAD2:
MAYBE_EMIT_CONST();
emit("movl 0(%%rsi), %%eax"); // get value from stack
RANGECHECK(eax);
RANGECHECK(eax, 2);
emit("movw 0(%%r8, %%rax, 1), %%ax"); // deref into eax
emit("movl %%eax, 0(%%rsi)"); // store on stack
break;
case OP_LOAD4:
MAYBE_EMIT_CONST();
emit("movl 0(%%rsi), %%eax"); // get value from stack
RANGECHECK(eax); // not a pointer!?
RANGECHECK(eax, 4); // not a pointer!?
emit("movl 0(%%r8, %%rax, 1), %%eax"); // deref into eax
emit("movl %%eax, 0(%%rsi)"); // store on stack
break;
@ -653,7 +653,7 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
emit("movl 0(%%rsi), %%eax"); // get value from stack
emit("andq $255, %%rax");
emit("movl -4(%%rsi), %%ebx"); // get pointer from stack
RANGECHECK(ebx);
RANGECHECK(ebx, 1);
emit("movb %%al, 0(%%r8, %%rbx, 1)"); // store in memory
emit("subq $8, %%rsi");
break;
@ -661,14 +661,14 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
MAYBE_EMIT_CONST();
emit("movl 0(%%rsi), %%eax"); // get value from stack
emit("movl -4(%%rsi), %%ebx"); // get pointer from stack
RANGECHECK(ebx);
RANGECHECK(ebx, 2);
emit("movw %%ax, 0(%%r8, %%rbx, 1)"); // store in memory
emit("subq $8, %%rsi");
break;
case OP_STORE4:
MAYBE_EMIT_CONST();
emit("movl -4(%%rsi), %%ebx"); // get pointer from stack
RANGECHECK(ebx);
RANGECHECK(ebx, 4);
emit("movl 0(%%rsi), %%ecx"); // get value from stack
emit("movl %%ecx, 0(%%r8, %%rbx, 1)"); // store in memory
emit("subq $8, %%rsi");
@ -679,7 +679,7 @@ void VM_Compile( vm_t *vm, vmHeader_t *header ) {
emit("movl 4(%%rsi), %%eax"); // get value from stack
emit("movl $0x%hhx, %%ebx", barg);
emit("addl %%edi, %%ebx");
RANGECHECK(ebx);
RANGECHECK(ebx, 4);
emit("movl %%eax, 0(%%r8,%%rbx, 1)"); // store in args space
break;
case OP_BLOCK_COPY: