ErrorCode Thread::readCPUState(Architecture::CPUState &state) {
CONTEXT context;
memset(&context, 0, sizeof(context));
context.ContextFlags = CONTEXT_INTEGER | // GP registers.
CONTEXT_CONTROL | // Some more GP + CPSR.
CONTEXT_FLOATING_POINT | // FP registers.
CONTEXT_DEBUG_REGISTERS; // Debug registers.
BOOL result = GetThreadContext(_handle, &context);
if (!result) {
return Platform::TranslateError();
}
// GP registers + CPSR.
state.gp.r0 = context.R0;
state.gp.r1 = context.R1;
state.gp.r2 = context.R2;
state.gp.r3 = context.R3;
state.gp.r4 = context.R4;
state.gp.r5 = context.R5;
state.gp.r6 = context.R6;
state.gp.r7 = context.R7;
state.gp.r8 = context.R8;
state.gp.r9 = context.R9;
state.gp.r10 = context.R10;
state.gp.r11 = context.R11;
state.gp.ip = context.R12;
state.gp.sp = context.Sp;
state.gp.lr = context.Lr;
state.gp.pc = context.Pc;
state.gp.cpsr = context.Cpsr;
// Floating point registers.
static_assert(sizeof(context.D) == sizeof(state.vfp.dbl),
"floating point register count mismatch");
for (size_t i = 0; i < array_sizeof(context.D); ++i) {
state.vfp.dbl[i].value = context.D[i];
}
state.vfp.fpscr = context.Fpscr;
if (state.isThumb()) {
if (state.gp.pc & 1ULL) {
DS2LOG(Debug, "removing thumb bit from pc and lr");
state.gp.pc &= ~1ULL;
} else {
DS2LOG(Warning,
"CPU is in thumb mode but doesn't have thumb bit set in pc");
}
}
// TODO(sas): Handle debug registers.
return kSuccess;
}
ErrorCode Thread::writeCPUState(Architecture::CPUState const &state) {
CONTEXT context;
memset(&context, 0, sizeof(context));
// TODO(sas): Handle debug registers.
context.ContextFlags = CONTEXT_INTEGER | // GP registers.
CONTEXT_CONTROL | // Some more GP + CPSR.
CONTEXT_FLOATING_POINT; // FP registers.
// GP registers + CPSR.
context.R0 = state.gp.r0;
context.R1 = state.gp.r1;
context.R2 = state.gp.r2;
context.R3 = state.gp.r3;
context.R4 = state.gp.r4;
context.R5 = state.gp.r5;
context.R6 = state.gp.r6;
context.R7 = state.gp.r7;
context.R8 = state.gp.r8;
context.R9 = state.gp.r9;
context.R10 = state.gp.r10;
context.R11 = state.gp.r11;
context.R12 = state.gp.ip;
context.Sp = state.gp.sp;
context.Lr = state.gp.lr;
context.Pc = state.gp.pc;
context.Cpsr = state.gp.cpsr;
// Floating point registers.
for (size_t i = 0; i < array_sizeof(context.D); ++i) {
context.D[i] = state.vfp.dbl[i].value;
}
context.Fpscr = state.vfp.fpscr;
if (state.isThumb()) {
DS2ASSERT(!(state.gp.pc & 1ULL));
DS2LOG(Debug, "setting back thumb bit on pc and lr");
context.Pc |= 1ULL;
}
BOOL result = SetThreadContext(_handle, &context);
if (!result) {
return Platform::TranslateError();
}
return kSuccess;
}