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1 | #include <stdarg.h> |
2 | |
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3 | #if (DRC_DEBUG & 1) |
4 | #define COUNT_OP \ |
5 | host_insn_count++ |
6 | #else |
7 | #define COUNT_OP |
8 | #endif |
9 | |
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10 | // TODO: move |
11 | static int reg_map_g2h[] = { |
12 | -1, -1, -1, -1, |
13 | -1, -1, -1, -1, |
14 | -1, -1, -1, -1, |
15 | -1, -1, -1, -1, |
16 | -1, -1, -1, -1, |
17 | -1, -1, -1, -1, |
18 | }; |
19 | |
20 | enum { xAX = 0, xCX, xDX, xBX, xSP, xBP, xSI, xDI }; |
21 | |
22 | #define EMIT_PTR(ptr, val, type) \ |
23 | *(type *)(ptr) = val |
24 | |
25 | #define EMIT(val, type) { \ |
26 | EMIT_PTR(tcache_ptr, val, type); \ |
27 | tcache_ptr = (char *)tcache_ptr + sizeof(type); \ |
28 | } |
29 | |
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30 | #define EMIT_OP(op) { \ |
31 | COUNT_OP; \ |
32 | EMIT(op, u8); \ |
33 | } |
34 | |
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35 | #define EMIT_MODRM(mod,r,rm) \ |
36 | EMIT(((mod)<<6) | ((r)<<3) | (rm), u8) |
37 | |
38 | #define EMIT_OP_MODRM(op,mod,r,rm) { \ |
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39 | EMIT_OP(op); \ |
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40 | EMIT_MODRM(mod, r, rm); \ |
41 | } |
42 | |
43 | #define emith_move_r_r(dst, src) \ |
44 | EMIT_OP_MODRM(0x8b, 3, dst, src) |
45 | |
46 | #define emith_move_r_imm(r, imm) { \ |
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47 | EMIT_OP(0xb8 + (r)); \ |
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48 | EMIT(imm, u32); \ |
49 | } |
50 | |
51 | #define emith_add_r_imm(r, imm) { \ |
52 | EMIT_OP_MODRM(0x81, 3, 0, r); \ |
53 | EMIT(imm, u32); \ |
54 | } |
55 | |
56 | #define emith_sub_r_imm(r, imm) { \ |
57 | EMIT_OP_MODRM(0x81, 3, 5, r); \ |
58 | EMIT(imm, u32); \ |
59 | } |
60 | |
61 | // XXX: offs is 8bit only |
62 | #define emith_ctx_read(r, offs) { \ |
63 | EMIT_OP_MODRM(0x8b, 1, r, 5); \ |
64 | EMIT(offs, u8); /* mov tmp, [ebp+#offs] */ \ |
65 | } |
66 | |
67 | #define emith_ctx_write(r, offs) { \ |
68 | EMIT_OP_MODRM(0x89, 1, r, 5); \ |
69 | EMIT(offs, u8); /* mov [ebp+#offs], tmp */ \ |
70 | } |
71 | |
72 | #define emith_ctx_sub(val, offs) { \ |
73 | EMIT_OP_MODRM(0x81, 1, 5, 5); \ |
74 | EMIT(offs, u8); \ |
75 | EMIT(val, u32); /* sub [ebp+#offs], dword val */ \ |
76 | } |
77 | |
78 | #define emith_test_t() { \ |
79 | if (reg_map_g2h[SHR_SR] == -1) { \ |
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80 | EMIT_OP_MODRM(0xf6, 1, 0, 5); \ |
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81 | EMIT(SHR_SR * 4, u8); \ |
82 | EMIT(0x01, u8); /* test [ebp+SHR_SR], byte 1 */ \ |
83 | } else { \ |
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84 | EMIT_OP_MODRM(0xf7, 3, 0, reg_map_g2h[SHR_SR]); \ |
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85 | EMIT(0x01, u16); /* test <reg>, word 1 */ \ |
86 | } \ |
87 | } |
88 | |
89 | #define emith_jump(ptr) { \ |
90 | u32 disp = (u32)ptr - ((u32)tcache_ptr + 5); \ |
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91 | EMIT_OP(0xe9); \ |
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92 | EMIT(disp, u32); \ |
93 | } |
94 | |
95 | #define emith_call(ptr) { \ |
96 | u32 disp = (u32)ptr - ((u32)tcache_ptr + 5); \ |
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97 | EMIT_OP(0xe8); \ |
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98 | EMIT(disp, u32); \ |
99 | } |
100 | |
101 | #define EMIT_CONDITIONAL(code, is_nonzero) { \ |
102 | char *ptr = tcache_ptr; \ |
103 | tcache_ptr = (char *)tcache_ptr + 2; \ |
104 | code; \ |
105 | EMIT_PTR(ptr, ((is_nonzero) ? 0x75 : 0x74), u8); \ |
106 | EMIT_PTR(ptr + 1, ((char *)tcache_ptr - (ptr + 2)), u8); \ |
107 | } |
108 | |
109 | static void emith_pass_arg(int count, ...) |
110 | { |
111 | va_list vl; |
112 | int i; |
113 | |
114 | va_start(vl, count); |
115 | |
116 | for (i = 0; i < count; i++) { |
117 | long av = va_arg(vl, long); |
118 | int r = 7; |
119 | |
120 | switch (i) { |
121 | case 0: r = xAX; break; |
122 | case 1: r = xDX; break; |
123 | case 2: r = xCX; break; |
124 | } |
125 | emith_move_r_imm(r, av); |
126 | } |
127 | |
128 | va_end(vl); |
129 | } |
130 | |