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dyncom: Handle unprivileged load/store variants correctly 

LDRT/LDRBT/STRBT/STRT should simulate the load or store
as if the host CPU is in user mode.

STRT is also allowed to use the PC as an operand
master
Lioncash 2015-12-19 18:39:33 +07:00
parent bbb96a392d
commit 5a531d7ec2
1 changed files with 33 additions and 7 deletions
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40
src/core/arm/dyncom/arm_dyncom_interpreter.cpp
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@ -4494,9 +4494,16 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
ldst_inst* inst_cream = (ldst_inst*)inst_base->component;
inst_cream->get_addr(cpu, inst_cream->inst, addr);
cpu->Reg[BITS(inst_cream->inst, 12, 15)] = cpu->ReadMemory8(addr);
const u32 dest_index = BITS(inst_cream->inst, 12, 15);
const u32 previous_mode = cpu->Mode;
if (BITS(inst_cream->inst, 12, 15) == 15) {
cpu->ChangePrivilegeMode(USER32MODE);
const u8 value = cpu->ReadMemory8(addr);
cpu->ChangePrivilegeMode(previous_mode);
cpu->Reg[dest_index] = value;
if (dest_index == 15) {
INC_PC(sizeof(ldst_inst));
goto DISPATCH;
}
@ -4668,10 +4675,16 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
ldst_inst* inst_cream = (ldst_inst*)inst_base->component;
inst_cream->get_addr(cpu, inst_cream->inst, addr);
unsigned int value = cpu->ReadMemory32(addr);
cpu->Reg[BITS(inst_cream->inst, 12, 15)] = value;
const u32 dest_index = BITS(inst_cream->inst, 12, 15);
const u32 previous_mode = cpu->Mode;
if (BITS(inst_cream->inst, 12, 15) == 15) {
cpu->ChangePrivilegeMode(USER32MODE);
const u32 value = cpu->ReadMemory32(addr);
cpu->ChangePrivilegeMode(previous_mode);
cpu->Reg[dest_index] = value;
if (dest_index == 15) {
INC_PC(sizeof(ldst_inst));
goto DISPATCH;
}
@ -6061,8 +6074,13 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
if (inst_base->cond == ConditionCode::AL || CondPassed(cpu, inst_base->cond)) {
ldst_inst* inst_cream = (ldst_inst*)inst_base->component;
inst_cream->get_addr(cpu, inst_cream->inst, addr);
unsigned int value = cpu->Reg[BITS(inst_cream->inst, 12, 15)] & 0xff;
const u32 previous_mode = cpu->Mode;
const u32 value = cpu->Reg[BITS(inst_cream->inst, 12, 15)] & 0xff;
cpu->ChangePrivilegeMode(USER32MODE);
cpu->WriteMemory8(addr, value);
cpu->ChangePrivilegeMode(previous_mode);
}
cpu->Reg[15] += cpu->GetInstructionSize();
INC_PC(sizeof(ldst_inst));
@ -6196,8 +6214,16 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
ldst_inst* inst_cream = (ldst_inst*)inst_base->component;
inst_cream->get_addr(cpu, inst_cream->inst, addr);
unsigned int value = cpu->Reg[BITS(inst_cream->inst, 12, 15)];
const u32 previous_mode = cpu->Mode;
const u32 rt_index = BITS(inst_cream->inst, 12, 15);
u32 value = cpu->Reg[rt_index];
if (rt_index == 15)
value += 2 * cpu->GetInstructionSize();
cpu->ChangePrivilegeMode(USER32MODE);
cpu->WriteMemory32(addr, value);
cpu->ChangePrivilegeMode(previous_mode);
}
cpu->Reg[15] += cpu->GetInstructionSize();
INC_PC(sizeof(ldst_inst));