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

ARM: Add F-block instruction decoding

This commit is contained in:
Vicki Pfau 2020-07-29 21:20:23 -07:00
parent f184b8a315
commit 2d8c926069
2 changed files with 18 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
CHANGES
View File

@ -24,6 +24,7 @@ Bugfixes:
- DS GX: Fix depth test scaling
- DS GX: Fix overflow causing a division crash
Misc:
- ARM: Add F-block instruction decoding
- DS GX: Clean up and unify texture mapping
- DS Core: Add symbol loading
- DS Video: Simplify VRAM mapping

18
src/arm/decoder-arm.c
View File

@ -372,6 +372,12 @@ DEFINE_DECODER_ARM(BX, BX,
info->operandFormat = ARM_OPERAND_REGISTER_1;
info->branchType = ARM_BRANCH_INDIRECT;)
DEFINE_DECODER_ARM(BLX, BLX,
int32_t offset = opcode << 8;
info->op1.immediate = offset >> 6;
info->operandFormat = ARM_OPERAND_IMMEDIATE_1;
info->branchType = ARM_BRANCH_LINKED;)
DEFINE_DECODER_ARM(BLX2, BLX,
info->op1.reg = opcode & 0x0000000F;
info->operandFormat = ARM_OPERAND_REGISTER_1;
@ -482,6 +488,10 @@ static const ARMDecoder _armDecoderTable[0x1000] = {
DECLARE_ARM_EMITTER_BLOCK(_ARMDecode, 5)
};
static const ARMDecoder _armDecoderFTable[0x1000] = {
DECLARE_ARM_F_EMITTER_BLOCK(_ARMDecode, 5)
};
void ARMDecodeARM(uint32_t opcode, struct ARMInstructionInfo* info) {
memset(info, 0, sizeof(*info));
info->execMode = MODE_ARM;
@ -489,6 +499,12 @@ void ARMDecodeARM(uint32_t opcode, struct ARMInstructionInfo* info) {
info->branchType = ARM_BRANCH_NONE;
info->condition = opcode >> 28;
info->sInstructionCycles = 1;
ARMDecoder decoder = _armDecoderTable[((opcode >> 16) & 0xFF0) | ((opcode >> 4) & 0x00F)];
ARMDecoder decoder;
if (info->condition == ARM_CONDITION_NV) {
decoder = _armDecoderFTable[((opcode >> 16) & 0xFF0) | ((opcode >> 4) & 0x00F)];
info->condition = ARM_CONDITION_AL;
} else {
decoder = _armDecoderTable[((opcode >> 16) & 0xFF0) | ((opcode >> 4) & 0x00F)];
}
decoder(opcode, info);
}