10 enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI };
12 #define CONTEXT_REG xBP
14 #define EMIT_PTR(ptr, val, type) \
17 #define EMIT(val, type) { \
18 EMIT_PTR(tcache_ptr, val, type); \
19 tcache_ptr += sizeof(type); \
22 #define EMIT_OP(op) { \
27 #define EMIT_MODRM(mod,r,rm) \
28 EMIT(((mod)<<6) | ((r)<<3) | (rm), u8)
30 #define EMIT_OP_MODRM(op,mod,r,rm) { \
32 EMIT_MODRM(mod, r, rm); \
35 #define emith_move_r_r(dst, src) \
36 EMIT_OP_MODRM(0x8b, 3, dst, src)
38 #define emith_move_r_imm(r, imm) { \
39 EMIT_OP(0xb8 + (r)); \
43 #define emith_add_r_imm(r, imm) { \
44 EMIT_OP_MODRM(0x81, 3, 0, r); \
48 #define emith_sub_r_imm(r, imm) { \
49 EMIT_OP_MODRM(0x81, 3, 5, r); \
53 // XXX: offs is 8bit only
54 #define emith_ctx_read(r, offs) { \
55 EMIT_OP_MODRM(0x8b, 1, r, xBP); \
56 EMIT(offs, u8); /* mov tmp, [ebp+#offs] */ \
59 #define emith_ctx_write(r, offs) { \
60 EMIT_OP_MODRM(0x89, 1, r, xBP); \
61 EMIT(offs, u8); /* mov [ebp+#offs], tmp */ \
64 #define emith_ctx_sub(val, offs) { \
65 EMIT_OP_MODRM(0x81, 1, 5, xBP); \
67 EMIT(val, u32); /* sub [ebp+#offs], dword val */ \
70 #define emith_jump(ptr) { \
71 u32 disp = (u32)ptr - ((u32)tcache_ptr + 5); \
76 #define emith_call(ptr) { \
77 u32 disp = (u32)ptr - ((u32)tcache_ptr + 5); \
82 #define EMITH_CONDITIONAL(code, is_nonzero) { \
83 u8 *ptr = tcache_ptr; \
84 tcache_ptr = tcache_ptr + 2; \
86 EMIT_PTR(ptr, ((is_nonzero) ? 0x75 : 0x74), u8); \
87 EMIT_PTR(ptr + 1, (tcache_ptr - (ptr + 2)), u8); \
90 #define arg2reg(rd, arg) \
92 case 0: rd = xAX; break; \
93 case 1: rd = xDX; break; \
94 case 2: rd = xCX; break; \
97 #define emith_pass_arg_r(arg, reg) { \
100 emith_move_r_r(rd, reg); \
103 #define emith_pass_arg_imm(arg, imm) { \
106 emith_move_r_imm(rd, imm); \
109 /* SH2 drc specific */
110 #define emith_test_t() { \
111 if (reg_map_g2h[SHR_SR] == -1) { \
112 EMIT_OP_MODRM(0xf6, 1, 0, 5); \
113 EMIT(SHR_SR * 4, u8); \
114 EMIT(0x01, u8); /* test [ebp+SHR_SR], byte 1 */ \
116 EMIT_OP_MODRM(0xf7, 3, 0, reg_map_g2h[SHR_SR]); \
117 EMIT(0x01, u16); /* test <reg>, word 1 */ \