ShuriZma
/
flycast
mirror of https://github.com/flyinghead/flycast.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

aica arm7: fallback to interpreter for invalid LDR/STR 

Fixes MINIDUMP-4X
This commit is contained in:
Flyinghead 2023-01-22 18:11:03 +01:00
parent 520e96a039
commit cc408f9688
1 changed files with 8 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
core/hw/arm7/arm7_rec.cpp
View File

@ -340,7 +340,7 @@ static ArmOp decodeArmOp(u32 opcode, u32 arm_pc)
{
// LDR/STR w pc-based offset and write-back
op.flags |= ArmOp::OP_SETS_PC;
// TODO not supported
// Invalid: Write-back must not be specified if R15 is used as the base register
op.op_type = ArmOp::FALLBACK;
op.arg[0] = ArmOp::Operand(opcode);
op.arg[1] = ArmOp::Operand();
@ -368,8 +368,13 @@ static ArmOp decodeArmOp(u32 opcode, u32 arm_pc)
op.arg[1].shift_value = bits.shift_imm;
if (op.arg[1].getReg().armreg == RN_PC)
{
verify(op.arg[1].shift_value == 0 && op.arg[1].shift_type == ArmOp::LSL);
op.arg[1] = ArmOp::Operand(arm_pc + 8);
// Invalid: r15 cannot be used as the offset register
op.op_type = ArmOp::FALLBACK;
op.arg[0] = ArmOp::Operand(opcode);
op.arg[1] = ArmOp::Operand();
op.arg[2] = ArmOp::Operand();
op.cycles = 0;
return op;
}
if (op.arg[1].shift_type == ArmOp::RRX && op.arg[1].shift_value == 0)
op.flags |= ArmOp::OP_READS_FLAGS;