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--- libswirl/hw/arm7/arm7_jit_virt_x86.cpp.orig 2020-10-18 11:22:48 UTC
+++ libswirl/hw/arm7/arm7_jit_virt_x86.cpp
@@ -13,6 +13,99 @@
#if HOST_OS == OS_LINUX || HOST_OS == OS_DARWIN
#include <sys/mman.h>
+
+#define DP_R_ROFC (OP_READ_FLAGS_S|OP_READ_REG_1) //Reads reg1, op2, flags if S
+#define DP_R_ROF (OP_READ_FLAGS|OP_READ_REG_1) //Reads reg1, op2, flags (ADC & co)
+#define DP_R_OFC (OP_READ_FLAGS_S) //Reads op2, flags if S
+
+#define DP_W_RFC (OP_WRITE_FLAGS_S|OP_WRITE_REG) //Writes reg, and flags if S
+#define DP_W_F (OP_WRITE_FLAGS) //Writes only flags, always (S=1)
+
+struct ArmDPOP {
+ u32 key;
+ u32 mask;
+ u32 flags;
+};
+
+vector<ArmDPOP> ops;
+
+void AddDPOP(u32 subcd, u32 rflags, u32 wflags) {
+ ArmDPOP op;
+
+ u32 key = subcd << 21;
+ u32 mask = (15 << 21) | (7 << 25);
+
+ op.flags = rflags | wflags;
+
+ if (wflags == DP_W_F) {
+ //also match S bit for opcodes that must write to flags (CMP & co)
+ mask |= 1 << 20;
+ key |= 1 << 20;
+ }
+
+ //ISR form (bit 25=0, bit 4 = 0)
+ op.key = key;
+ op.mask = mask | (1 << 4);
+ ops.push_back(op);
+
+ //RSR form (bit 25=0, bit 4 = 1, bit 7=0)
+ op.key = key | (1 << 4);
+ op.mask = mask | (1 << 4) | (1 << 7);
+ ops.push_back(op);
+
+ //imm8r4 form (bit 25=1)
+ op.key = key | (1 << 25);
+ op.mask = mask;
+ ops.push_back(op);
+}
+
+void InitHash() {
+ /*
+ COND | 00 I OP1 S Rn Rd OPER2 -- Data opcode, PSR xfer
+ Data processing opcodes
+ */
+
+ //AND 0000 Rn, OPER2, {Flags} Rd, {Flags}
+ //EOR 0001 Rn, OPER2, {Flags} Rd, {Flags}
+ //SUB 0010 Rn, OPER2, {Flags} Rd, {Flags}
+ //RSB 0011 Rn, OPER2, {Flags} Rd, {Flags}
+ //ADD 0100 Rn, OPER2, {Flags} Rd, {Flags}
+ //ORR 1100 Rn, OPER2, {Flags} Rd, {Flags}
+ //BIC 1110 Rn, OPER2, {Flags} Rd, {Flags}
+ AddDPOP(0, DP_R_ROFC, DP_W_RFC);
+ AddDPOP(1, DP_R_ROFC, DP_W_RFC);
+ AddDPOP(2, DP_R_ROFC, DP_W_RFC);
+ AddDPOP(3, DP_R_ROFC, DP_W_RFC);
+ AddDPOP(4, DP_R_ROFC, DP_W_RFC);
+ AddDPOP(12, DP_R_ROFC, DP_W_RFC);
+ AddDPOP(14, DP_R_ROFC, DP_W_RFC);
+
+ //ADC 0101 Rn, OPER2, Flags Rd, {Flags}
+ //SBC 0110 Rn, OPER2, Flags Rd, {Flags}
+ //RSC 0111 Rn, OPER2, Flags Rd, {Flags}
+ AddDPOP(5, DP_R_ROF, DP_W_RFC);
+ AddDPOP(6, DP_R_ROF, DP_W_RFC);
+ AddDPOP(7, DP_R_ROF, DP_W_RFC);
+
+ //TST 1000 S=1 Rn, OPER2, Flags Flags
+ //TEQ 1001 S=1 Rn, OPER2, Flags Flags
+ AddDPOP(8, DP_R_ROF, DP_W_F);
+ AddDPOP(9, DP_R_ROF, DP_W_F);
+
+ //CMP 1010 S=1 Rn, OPER2 Flags
+ //CMN 1011 S=1 Rn, OPER2 Flags
+ AddDPOP(10, DP_R_ROF, DP_W_F);
+ AddDPOP(11, DP_R_ROF, DP_W_F);
+
+ //MOV 1101 OPER2, {Flags} Rd, {Flags}
+ //MVN 1111 OPER2, {Flags} Rd, {Flags}
+ AddDPOP(13, DP_R_OFC, DP_W_RFC);
+ AddDPOP(15, DP_R_OFC, DP_W_RFC);
+}
+
+void armt_init() {
+ InitHash();
+}
#endif
#if HOST_OS == OS_WINDOWS
#include <Windows.h>
@@ -455,4 +548,4 @@ struct Arm7VirtBackendX86 : Arm7VirtBackend {
Arm7VirtBackend* Arm7VirtBackend::Create(ARM7Backend* arm, Arm7Context* ctx) {
return new Arm7VirtBackendX86(arm, ctx);
}
-#endif
\ No newline at end of file
+#endif
|
