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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
This commit is contained in:
Lioncash 2015-12-19 18:39:33 -05:00
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; ldst_inst* inst_cream = (ldst_inst*)inst_base->component;
inst_cream->get_addr(cpu, inst_cream->inst, addr); 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)); INC_PC(sizeof(ldst_inst));
goto DISPATCH; goto DISPATCH;
} }
@ -4668,10 +4675,16 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
ldst_inst* inst_cream = (ldst_inst*)inst_base->component; ldst_inst* inst_cream = (ldst_inst*)inst_base->component;
inst_cream->get_addr(cpu, inst_cream->inst, addr); inst_cream->get_addr(cpu, inst_cream->inst, addr);
unsigned int value = cpu->ReadMemory32(addr); const u32 dest_index = BITS(inst_cream->inst, 12, 15);
cpu->Reg[BITS(inst_cream->inst, 12, 15)] = value; 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)); INC_PC(sizeof(ldst_inst));
goto DISPATCH; goto DISPATCH;
} }
@ -6061,8 +6074,13 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
if (inst_base->cond == ConditionCode::AL || CondPassed(cpu, inst_base->cond)) { if (inst_base->cond == ConditionCode::AL || CondPassed(cpu, inst_base->cond)) {
ldst_inst* inst_cream = (ldst_inst*)inst_base->component; ldst_inst* inst_cream = (ldst_inst*)inst_base->component;
inst_cream->get_addr(cpu, inst_cream->inst, addr); 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->WriteMemory8(addr, value);
cpu->ChangePrivilegeMode(previous_mode);
} }
cpu->Reg[15] += cpu->GetInstructionSize(); cpu->Reg[15] += cpu->GetInstructionSize();
INC_PC(sizeof(ldst_inst)); INC_PC(sizeof(ldst_inst));
@ -6196,8 +6214,16 @@ unsigned InterpreterMainLoop(ARMul_State* cpu) {
ldst_inst* inst_cream = (ldst_inst*)inst_base->component; ldst_inst* inst_cream = (ldst_inst*)inst_base->component;
inst_cream->get_addr(cpu, inst_cream->inst, addr); 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->WriteMemory32(addr, value);
cpu->ChangePrivilegeMode(previous_mode);
} }
cpu->Reg[15] += cpu->GetInstructionSize(); cpu->Reg[15] += cpu->GetInstructionSize();
INC_PC(sizeof(ldst_inst)); INC_PC(sizeof(ldst_inst));