implement LDR/STR/LDRB/STRB.

more macro soup.
2025-07-25 15:19:53 -06:00 · 2016-12-03 01:31:33 +01:00
parent 97ec988dae
commit 23d584ca4c
8 changed files with 660 additions and 275 deletions
--- a/ARMInterpreter_LoadStore.cpp
+++ b/ARMInterpreter_LoadStore.cpp
@ -0,0 +1,202 @@
+#include "ARM.h"
+
+
+namespace ARMInterpreter
+{
+
+
+// copypasta from ALU. bad
+#define LSL_IMM(x, s) \
+    x <<= s;
+
+#define LSR_IMM(x, s) \
+    if (s == 0) s = 32; \
+    x >>= s;
+
+#define ASR_IMM(x, s) \
+    if (s == 0) s = 32; \
+    x = ((s32)x) >> s;
+
+#define ROR_IMM(x, s) \
+    if (s == 0) \
+    { \
+        x = (x >> 1) | ((cpu->CPSR & 0x20000000) << 2); \
+    } \
+    else \
+    { \
+        x = ROR(x, s); \
+    }
+
+
+
+#define A_WB_CALC_OFFSET_IMM \
+    u32 offset = (cpu->CurInstr & 0xFFF); \
+    if (!(cpu->CurInstr & (1<<23))) offset = -offset;
+
+#define A_WB_CALC_OFFSET_REG(shiftop) \
+    u32 offset = cpu->R[cpu->CurInstr & 0xF]; \
+    u32 shift = ((cpu->CurInstr>>7)&0x1F); \
+    shiftop(offset, shift); \
+    if (!(cpu->CurInstr & (1<<23))) offset = -offset;
+
+
+
+#define A_STR \
+    offset += cpu->R[(cpu->CurInstr>>16) & 0xF]; \
+    cpu->Write32(offset, cpu->R[(cpu->CurInstr>>12) & 0xF]); \
+    if (cpu->CurInstr & (1<<21)) cpu->R[(cpu->CurInstr>>16) & 0xF] = offset; \
+    return C_N(2) + cpu->MemWaitstate(3, offset);
+
+#define A_STR_POST \
+    u32 addr = cpu->R[(cpu->CurInstr>>16) & 0xF]; \
+    cpu->Write32(addr, cpu->R[(cpu->CurInstr>>12) & 0xF], cpu->CurInstr & (1<<21)); \
+    cpu->R[(cpu->CurInstr>>16) & 0xF] += offset; \
+    return C_N(2) + cpu->MemWaitstate(3, addr);
+
+#define A_STRB \
+    offset += cpu->R[(cpu->CurInstr>>16) & 0xF]; \
+    cpu->Write8(offset, cpu->R[(cpu->CurInstr>>12) & 0xF]); \
+    if (cpu->CurInstr & (1<<21)) cpu->R[(cpu->CurInstr>>16) & 0xF] = offset; \
+    return C_N(2) + cpu->MemWaitstate(3, offset);
+
+#define A_STRB_POST \
+    u32 addr = cpu->R[(cpu->CurInstr>>16) & 0xF]; \
+    cpu->Write8(addr, cpu->R[(cpu->CurInstr>>12) & 0xF], cpu->CurInstr & (1<<21)); \
+    cpu->R[(cpu->CurInstr>>16) & 0xF] += offset; \
+    return C_N(2) + cpu->MemWaitstate(3, addr);
+
+#define A_LDR \
+    offset += cpu->R[(cpu->CurInstr>>16) & 0xF]; \
+    u32 val = ROR(cpu->Read32(offset), offset&0x3); \
+    if (cpu->CurInstr & (1<<21)) cpu->R[(cpu->CurInstr>>16) & 0xF] = offset; \
+    if (((cpu->CurInstr>>12) & 0xF) == 15) \
+    { \
+        if (cpu->Num==1) val &= ~0x1; \
+        cpu->JumpTo(val); \
+        return C_S(2) + C_N(2) + C_I(1) + cpu->MemWaitstate(3, offset); \
+    } \
+    else \
+    { \
+        cpu->R[(cpu->CurInstr>>12) & 0xF] = val; \
+        return C_S(1) + C_N(1) + C_I(1) + cpu->MemWaitstate(3, offset); \
+    }
+
+#define A_LDR_POST \
+    u32 addr = cpu->R[(cpu->CurInstr>>16) & 0xF]; \
+    u32 val = ROR(cpu->Read32(addr, cpu->CurInstr & (1<<21)), addr&0x3); \
+    cpu->R[(cpu->CurInstr>>16) & 0xF] += offset; \
+    if (((cpu->CurInstr>>12) & 0xF) == 15) \
+    { \
+        if (cpu->Num==1) val &= ~0x1; \
+        cpu->JumpTo(val); \
+        return C_S(2) + C_N(2) + C_I(1) + cpu->MemWaitstate(3, addr); \
+    } \
+    else \
+    { \
+        cpu->R[(cpu->CurInstr>>12) & 0xF] = val; \
+        return C_S(1) + C_N(1) + C_I(1) + cpu->MemWaitstate(3, addr); \
+    }
+
+#define A_LDRB \
+    offset += cpu->R[(cpu->CurInstr>>16) & 0xF]; \
+    u32 val = cpu->Read8(offset); \
+    if (cpu->CurInstr & (1<<21)) cpu->R[(cpu->CurInstr>>16) & 0xF] = offset; \
+    cpu->R[(cpu->CurInstr>>12) & 0xF] = val; \
+    return C_S(1) + C_N(1) + C_I(1) + cpu->MemWaitstate(3, offset);
+
+#define A_LDRB_POST \
+    u32 addr = cpu->R[(cpu->CurInstr>>16) & 0xF]; \
+    u32 val = cpu->Read8(addr, cpu->CurInstr & (1<<21)); \
+    cpu->R[(cpu->CurInstr>>16) & 0xF] += offset; \
+    cpu->R[(cpu->CurInstr>>12) & 0xF] = val; \
+    return C_S(1) + C_N(1) + C_I(1) + cpu->MemWaitstate(3, addr);
+
+
+
+#define A_IMPLEMENT_WB_LDRSTR(x) \
+\
+s32 A_##x##_IMM(ARM* cpu) \
+{ \
+    A_WB_CALC_OFFSET_IMM \
+    A_##x \
+} \
+\
+s32 A_##x##_REG_LSL(ARM* cpu) \
+{ \
+    A_WB_CALC_OFFSET_REG(LSL_IMM) \
+    A_##x \
+} \
+\
+s32 A_##x##_REG_LSR(ARM* cpu) \
+{ \
+    A_WB_CALC_OFFSET_REG(LSR_IMM) \
+    A_##x \
+} \
+\
+s32 A_##x##_REG_ASR(ARM* cpu) \
+{ \
+    A_WB_CALC_OFFSET_REG(ASR_IMM) \
+    A_##x \
+} \
+\
+s32 A_##x##_REG_ROR(ARM* cpu) \
+{ \
+    A_WB_CALC_OFFSET_REG(ROR_IMM) \
+    A_##x \
+} \
+\
+s32 A_##x##_POST_IMM(ARM* cpu) \
+{ \
+    A_WB_CALC_OFFSET_IMM \
+    A_##x##_POST \
+} \
+\
+s32 A_##x##_POST_REG_LSL(ARM* cpu) \
+{ \
+    A_WB_CALC_OFFSET_REG(LSL_IMM) \
+    A_##x##_POST \
+} \
+\
+s32 A_##x##_POST_REG_LSR(ARM* cpu) \
+{ \
+    A_WB_CALC_OFFSET_REG(LSR_IMM) \
+    A_##x##_POST \
+} \
+\
+s32 A_##x##_POST_REG_ASR(ARM* cpu) \
+{ \
+    A_WB_CALC_OFFSET_REG(ASR_IMM) \
+    A_##x##_POST \
+} \
+\
+s32 A_##x##_POST_REG_ROR(ARM* cpu) \
+{ \
+    A_WB_CALC_OFFSET_REG(ROR_IMM) \
+    A_##x##_POST \
+}
+
+A_IMPLEMENT_WB_LDRSTR(STR)
+A_IMPLEMENT_WB_LDRSTR(STRB)
+A_IMPLEMENT_WB_LDRSTR(LDR)
+A_IMPLEMENT_WB_LDRSTR(LDRB)
+
+
+
+#define A_HD_CALC_OFFSET_IMM \
+    u32 offset = (cpu->CurInstr & 0xF) | ((cpu->CurInstr >> 4) & 0xF0); \
+    if (!(cpu->CurInstr & (1<<23))) offset = -offset;
+
+#define A_HD_CALC_OFFSET_REG \
+    u32 offset = cpu->R[cpu->CurInstr & 0xF]; \
+    if (!(cpu->CurInstr & (1<<23))) offset = -offset;
+
+
+
+#define A_STRH \
+    offset += cpu->R[(cpu->CurInstr>>16) & 0xF]; \
+    cpu->Write16(offset, cpu->R[(cpu->CurInstr>>12) & 0xF]); \
+    if (cpu->CurInstr & (1<<24)) cpu->R[(cpu->CurInstr>>16) & 0xF] = offset; \
+
+
+}
+