drc: split disassembly to separate pass

[picodrive.git] / cpu / drc / emit_x86.c

diff --git a/cpu/drc/emit_x86.c b/cpu/drc/emit_x86.c
index c823cfb..f14430b 100644 (file)
--- a/cpu/drc/emit_x86.c
+++ b/cpu/drc/emit_x86.c
@@ -1,6 +1,12 @@
 /*
+ * Basic macros to emit x86 instructions and some utils
+ * Copyright (C) 2008,2009,2010 notaz
+ *
+ * This work is licensed under the terms of MAME license.
+ * See COPYING file in the top-level directory.
+ *
  * note:
- *  temp registers must be eax-edx due to use of SETcc.
+ *  temp registers must be eax-edx due to use of SETcc and r/w 8/16.
  * note about silly things like emith_eor_r_r_r:
  *  these are here because the compiler was designed
  *  for ARM as it's primary target.
@@ -63,10 +69,10 @@ enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI };
 #define EMIT_SIB(scale,index,base) \
        EMIT(((scale)<<6) | ((index)<<3) | (base), u8)
 
-#define EMIT_OP_MODRM(op,mod,r,rm) { \
+#define EMIT_OP_MODRM(op,mod,r,rm) do { \
        EMIT_OP(op); \
        EMIT_MODRM(mod, r, rm); \
-}
+} while (0)
 
 #define JMP8_POS(ptr) \
        ptr = tcache_ptr; \
@@ -139,6 +145,17 @@ enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI };
 }
 
 // _r_r_r
+#define emith_add_r_r_r(d, s1, s2) { \
+       if (d == s1) { \
+               emith_add_r_r(d, s2); \
+       } else if (d == s2) { \
+               emith_add_r_r(d, s1); \
+       } else { \
+               emith_move_r_r(d, s1); \
+               emith_add_r_r(d, s2); \
+       } \
+}
+
 #define emith_eor_r_r_r(d, s1, s2) { \
        if (d == s1) { \
                emith_eor_r_r(d, s2); \
@@ -180,13 +197,18 @@ enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI };
        EMIT(imm, u32); \
 } while (0)
 
-// 2 - adc, 3 - sbb
 #define emith_add_r_imm(r, imm) \
        emith_arith_r_imm(0, r, imm)
 
 #define emith_or_r_imm(r, imm) \
        emith_arith_r_imm(1, r, imm)
 
+#define emith_adc_r_imm(r, imm) \
+       emith_arith_r_imm(2, r, imm)
+
+#define emith_sbc_r_imm(r, imm) \
+       emith_arith_r_imm(3, r, imm) // sbb
+
 #define emith_and_r_imm(r, imm) \
        emith_arith_r_imm(4, r, imm)
 
@@ -411,17 +433,36 @@ enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI };
        } \
 } while (0)
 
+#define is_abcdx(r) (xAX <= (r) && (r) <= xDX)
+
 #define emith_read_r_r_offs(r, rs, offs) \
        emith_deref_op(0x8b, r, rs, offs)
 
 #define emith_write_r_r_offs(r, rs, offs) \
        emith_deref_op(0x89, r, rs, offs)
 
-#define emith_read8_r_r_offs(r, rs, offs) \
-       emith_deref_op(0x8a, r, rs, offs)
+// note: don't use prefixes on this
+#define emith_read8_r_r_offs(r, rs, offs) do { \
+       int r_ = r; \
+       if (!is_abcdx(r)) \
+               r_ = rcache_get_tmp(); \
+       emith_deref_op(0x8a, r_, rs, offs); \
+       if ((r) != r_) { \
+               emith_move_r_r(r, r_); \
+               rcache_free_tmp(r_); \
+       } \
+} while (0)
 
-#define emith_write8_r_r_offs(r, rs, offs) \
-       emith_deref_op(0x88, r, rs, offs)
+#define emith_write8_r_r_offs(r, rs, offs) do {\
+       int r_ = r; \
+       if (!is_abcdx(r)) { \
+               r_ = rcache_get_tmp(); \
+               emith_move_r_r(r_, r); \
+       } \
+       emith_deref_op(0x88, r_, rs, offs); \
+       if ((r) != r_) \
+               rcache_free_tmp(r_); \
+} while (0)
 
 #define emith_read16_r_r_offs(r, rs, offs) { \
        EMIT(0x66, u8); /* operand override */ \
@@ -430,7 +471,7 @@ enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI };
 
 #define emith_write16_r_r_offs(r, rs, offs) { \
        EMIT(0x66, u8); \
-       emith_write16_r_r_offs(r, rs, offs) \
+       emith_write_r_r_offs(r, rs, offs); \
 }
 
 #define emith_ctx_read(r, offs) \
@@ -482,6 +523,12 @@ enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI };
        EMIT_PTR((u8 *)(ptr) + offs_, disp_ - offs_, u32); \
 } while (0)
 
+#define emith_jump_at(ptr, target) { \
+       u32 disp_ = (u32)(target) - ((u32)(ptr) + 5); \
+       EMIT_PTR(ptr, 0xe9, u8); \
+       EMIT_PTR((u8 *)(ptr) + 1, disp_, u32); \
+}
+
 #define emith_call(ptr) { \
        u32 disp = (u32)(ptr) - ((u32)tcache_ptr + 5); \
        EMIT_OP(0xe8); \
@@ -510,6 +557,11 @@ enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI };
        EMIT(offs, u32); \
 }
 
+#define emith_push_ret()
+
+#define emith_pop_and_ret() \
+       emith_ret()
+
 #define EMITH_JMP_START(cond) { \
        u8 *cond_ptr; \
        JMP8_POS(cond_ptr)
@@ -539,13 +591,6 @@ enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI };
 #define EMITH_SJMP3_MID EMITH_JMP3_MID
 #define EMITH_SJMP3_END EMITH_JMP3_END
 
-#define host_arg2reg(rd, arg) \
-       switch (arg) { \
-       case 0: rd = xAX; break; \
-       case 1: rd = xDX; break; \
-       case 2: rd = xCX; break; \
-       }
-
 #define emith_pass_arg_r(arg, reg) { \
        int rd = 7; \
        host_arg2reg(rd, arg); \
@@ -558,6 +603,15 @@ enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI };
        emith_move_r_imm(rd, imm); \
 }
 
+#define host_instructions_updated(base, end)
+
+#define host_arg2reg(rd, arg) \
+       switch (arg) { \
+       case 0: rd = xAX; break; \
+       case 1: rd = xDX; break; \
+       case 2: rd = xCX; break; \
+       }
+
 /* SH2 drc specific */
 #define emith_sh2_drc_entry() { \
        emith_push(xBX);        \
@@ -575,14 +629,13 @@ enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI };
 }
 
 // assumes EBX is free temporary
-#define emith_sh2_wcall(a, tab, ret_ptr) { \
+#define emith_sh2_wcall(a, tab) { \
        int arg2_; \
        host_arg2reg(arg2_, 2); \
        emith_lsr(xBX, a, SH2_WRITE_SHIFT); \
        EMIT_OP_MODRM(0x8b, 0, xBX, 4); \
        EMIT_SIB(2, xBX, tab); /* mov ebx, [tab + ebx * 4] */ \
        emith_ctx_read(arg2_, offsetof(SH2, is_slave)); \
-       emith_push_imm((long)(ret_ptr)); \
        emith_jump_reg(xBX); \
 }