void NCValidateSegment(uint8_t *mbase, NaClPcAddress vbase, size_t sz,
struct NCValidatorState *vstate) {
if (sz == 0) {
ValidatePrintError(0, "Bad text segment (zero size)", vstate);
Stats_SegFault(vstate);
return;
}
GetCPUFeatures(&(vstate->cpufeatures));
/* The name of the flag is misleading; f_386 requires not just */
/* 386 instructions but also the CPUID instruction is supported. */
if (!vstate->cpufeatures.f_386) {
ValidatePrintError(0, "CPU does not support CPUID", vstate);
Stats_BadCPU(vstate);
return;
}
#if (0)
/* TODO(bradchen): enable this check */
if (!vstate->cpufeatures.f_whitelisted) {
ValidatePrintError(0, "CPU does not support CPUID", vstate);
Stats_BadCPU(vstate);
return;
}
#endif
NCDecodeSegment(mbase, vbase, sz, vstate);
}
void NaClDisassembleSegment(uint8_t* mbase, NaClPcAddress vbase,
NaClMemorySize size, NaClDisassembleFlags flags) {
if (NaClHasBit(flags, NACL_DISASSEMBLE_FLAG(NaClDisassembleFull))) {
if (NaClHasBit(flags,
NACL_DISASSEMBLE_FLAG(NaClDisassembleValidatorDecoder))) {
gprintf(NaClLogGetGio(),
"Error: can't specify both full and validator disassembly,\n"
" assuming full disassembly.\n");
}
NaClDisassembleSegmentUsingTables(mbase, vbase, size, flags,
kNaClDecoderTables);
} else if (NaClHasBit
(flags,
NACL_DISASSEMBLE_FLAG(NaClDisassembleValidatorDecoder))) {
if (64 == NACL_TARGET_SUBARCH) {
NaClDisassembleSegmentUsingTables(mbase, vbase, size, flags,
kNaClValDecoderTables);
} else {
NCDecodeSegment(mbase, vbase, size);
}
} else {
gprintf(NaClLogGetGio(),
"Error: No decoder tables specified, can't disassemble\n");
}
}
static void FixUpSection(uintptr_t load_address,
unsigned char *code,
size_t code_size) {
struct NCValidatorState *vstate;
int bundle_size = 32;
vstate = NCValidateInit(load_address, load_address + code_size, bundle_size);
CHECK(vstate != NULL);
vstate->do_stub_out = 1;
/*
* We should not stub out any instructions based on the features
* of the CPU we are executing on now.
*/
memset(&vstate->cpufeatures, 0xff, sizeof(vstate->cpufeatures));
NCDecodeSegment(code, load_address, code_size, vstate);
/*
* We do not need to call NCValidateFinish() because it is
* normal for validation to fail.
*/
NCValidateFreeState(&vstate);
}
