1 files changed, 109 insertions, 0 deletions
diff --git a/emulators/libretro-reicast/files/patch-libswirl_hw_arm7_arm7__jit__virt__x86.cpp b/emulators/libretro-reicast/files/patch-libswirl_hw_arm7_arm7__jit__virt__x86.cpp
new file mode 100644
index 000000000000..f2c04dd29ffa
--- /dev/null
+++ b/emulators/libretro-reicast/files/patch-libswirl_hw_arm7_arm7__jit__virt__x86.cpp
@@ -0,0 +1,109 @@
+--- 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