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Merge pull request #596 from kevinhartman/unaligned-cleanup

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Clean up unaligned 32-bit memory reads
This commit is contained in:
bunnei 2015-02-22 12:48:28 -05:00
commit dfe807b2cd
2 changed files with 2 additions and 35 deletions
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19
src/core/arm/dyncom/arm_dyncom_interpreter.cpp
View file

@ -4422,12 +4422,7 @@ unsigned InterpreterMainLoop(ARMul_State* state) {
inst_cream->get_addr(cpu, inst_cream->inst, addr, 1); inst_cream->get_addr(cpu, inst_cream->inst, addr, 1);
unsigned int value = Memory::Read32(addr); unsigned int value = Memory::Read32(addr);
if (BIT(CP15_REG(CP15_CONTROL), 22) == 1) cpu->Reg[BITS(inst_cream->inst, 12, 15)] = value;
cpu->Reg[BITS(inst_cream->inst, 12, 15)] = value;
else {
value = ROTATE_RIGHT_32(value,(8*(addr&0x3)));
cpu->Reg[BITS(inst_cream->inst, 12, 15)] = value;
}
if (BITS(inst_cream->inst, 12, 15) == 15) { if (BITS(inst_cream->inst, 12, 15) == 15) {
// For armv5t, should enter thumb when bits[0] is non-zero. // For armv5t, should enter thumb when bits[0] is non-zero.
@ -4450,12 +4445,7 @@ unsigned InterpreterMainLoop(ARMul_State* state) {
inst_cream->get_addr(cpu, inst_cream->inst, addr, 1); inst_cream->get_addr(cpu, inst_cream->inst, addr, 1);
unsigned int value = Memory::Read32(addr); unsigned int value = Memory::Read32(addr);
if (BIT(CP15_REG(CP15_CONTROL), 22) == 1) cpu->Reg[BITS(inst_cream->inst, 12, 15)] = value;
cpu->Reg[BITS(inst_cream->inst, 12, 15)] = value;
else {
value = ROTATE_RIGHT_32(value,(8*(addr&0x3)));
cpu->Reg[BITS(inst_cream->inst, 12, 15)] = value;
}
if (BITS(inst_cream->inst, 12, 15) == 15) { if (BITS(inst_cream->inst, 12, 15) == 15) {
// For armv5t, should enter thumb when bits[0] is non-zero. // For armv5t, should enter thumb when bits[0] is non-zero.
@ -4699,11 +4689,6 @@ unsigned InterpreterMainLoop(ARMul_State* state) {
unsigned int value = Memory::Read32(addr); unsigned int value = Memory::Read32(addr);
cpu->Reg[BITS(inst_cream->inst, 12, 15)] = value; cpu->Reg[BITS(inst_cream->inst, 12, 15)] = value;
if (BIT(CP15_REG(CP15_CONTROL), 22) == 1)
cpu->Reg[BITS(inst_cream->inst, 12, 15)] = value;
else
cpu->Reg[BITS(inst_cream->inst, 12, 15)] = ROTATE_RIGHT_32(value,(8*(addr&0x3))) ;
if (BITS(inst_cream->inst, 12, 15) == 15) { if (BITS(inst_cream->inst, 12, 15) == 15) {
INC_PC(sizeof(ldst_inst)); INC_PC(sizeof(ldst_inst));
goto DISPATCH; goto DISPATCH;

18
src/core/mem_map_funcs.cpp
View file

@ -236,30 +236,12 @@ u8 Read8(const VAddr addr) {
u16 Read16(const VAddr addr) { u16 Read16(const VAddr addr) {
u16_le data = 0; u16_le data = 0;
Read<u16_le>(data, addr); Read<u16_le>(data, addr);
// Check for 16-bit unaligned memory reads...
if (addr & 1) {
// TODO(bunnei): Implement 16-bit unaligned memory reads
LOG_ERROR(HW_Memory, "16-bit unaligned memory reads are not implemented!");
}
return (u16)data; return (u16)data;
} }
u32 Read32(const VAddr addr) { u32 Read32(const VAddr addr) {
u32_le data = 0; u32_le data = 0;
Read<u32_le>(data, addr); Read<u32_le>(data, addr);
// Check for 32-bit unaligned memory reads...
if (addr & 3) {
// ARM allows for unaligned memory reads, however older ARM architectures read out memory
// from unaligned addresses in a shifted way. Our ARM CPU core (SkyEye) corrects for this,
// so therefore expects the memory to be read out in this manner.
// TODO(bunnei): Determine if this is necessary - perhaps it is OK to remove this from both
// SkyEye and here?
int shift = (addr & 3) * 8;
data = (data << shift) | (data >> (32 - shift));
}
return (u32)data; return (u32)data;
} }