57e4efe9 |
1 | #include <stdio.h> |
2 | #include <stdlib.h> |
3 | #include <string.h> |
4 | |
5 | #include "my_assert.h" |
6 | #include "my_str.h" |
7 | |
232aca37 |
8 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0])) |
3e52f54c |
9 | #define IS(w, y) !strcmp(w, y) |
232aca37 |
10 | |
c36e914d |
11 | #include "protoparse.h" |
232aca37 |
12 | |
13 | static int is_x86_reg_saved(const char *reg) |
14 | { |
15 | static const char *nosave_regs[] = { "eax", "edx", "ecx" }; |
16 | int nosave = 0; |
17 | int r; |
18 | |
19 | for (r = 0; r < ARRAY_SIZE(nosave_regs); r++) |
20 | if (strcmp(reg, nosave_regs[r]) == 0) |
21 | nosave = 1; |
22 | |
23 | return !nosave; |
24 | } |
25 | |
54e763a1 |
26 | static void out_toasm_x86(FILE *f, const char *sym_in, |
27 | const char *sym_out, const struct parsed_proto *pp) |
232aca37 |
28 | { |
232aca37 |
29 | int must_save = 0; |
30 | int sarg_ofs = 1; // stack offset to args, in DWORDs |
31 | int args_repushed = 0; |
4f12f671 |
32 | int argc_repush; |
232aca37 |
33 | int i; |
34 | |
4f12f671 |
35 | argc_repush = pp->argc; |
36 | if (pp->is_vararg) |
37 | argc_repush = ARRAY_SIZE(pp->arg); // hopefully enough? |
38 | |
c36e914d |
39 | for (i = 0; i < pp->argc; i++) { |
40 | if (pp->arg[i].reg != NULL) |
41 | must_save |= is_x86_reg_saved(pp->arg[i].reg); |
232aca37 |
42 | } |
43 | |
54e763a1 |
44 | fprintf(f, ".global _%s\n", sym_in); |
45 | fprintf(f, "_%s:\n", sym_in); |
232aca37 |
46 | |
54e763a1 |
47 | if (pp->argc_reg == 0) { |
48 | fprintf(f, "\tjmp %s\n\n", sym_out); |
232aca37 |
49 | return; |
50 | } |
51 | |
4f12f671 |
52 | if (pp->argc_stack == 0 && !must_save && !pp->is_stdcall |
53 | && !pp->is_vararg) |
54 | { |
232aca37 |
55 | // load arg regs |
c36e914d |
56 | for (i = 0; i < pp->argc; i++) { |
232aca37 |
57 | fprintf(f, "\tmovl %d(%%esp), %%%s\n", |
c36e914d |
58 | (i + sarg_ofs) * 4, pp->arg[i].reg); |
232aca37 |
59 | } |
54e763a1 |
60 | fprintf(f, "\tjmp %s\n\n", sym_out); |
232aca37 |
61 | return; |
62 | } |
63 | |
64 | // save the regs |
c36e914d |
65 | for (i = 0; i < pp->argc; i++) { |
66 | if (pp->arg[i].reg != NULL && is_x86_reg_saved(pp->arg[i].reg)) { |
67 | fprintf(f, "\tpushl %%%s\n", pp->arg[i].reg); |
232aca37 |
68 | sarg_ofs++; |
69 | } |
70 | } |
71 | |
72 | // reconstruct arg stack |
4f12f671 |
73 | for (i = argc_repush - 1; i >= 0; i--) { |
c36e914d |
74 | if (pp->arg[i].reg == NULL) { |
232aca37 |
75 | fprintf(f, "\tmovl %d(%%esp), %%eax\n", |
76 | (i + sarg_ofs) * 4); |
77 | fprintf(f, "\tpushl %%eax\n"); |
78 | sarg_ofs++; |
79 | args_repushed++; |
80 | } |
81 | } |
4f12f671 |
82 | // my_assert(args_repushed, pp->argc_stack); |
232aca37 |
83 | |
84 | // load arg regs |
c36e914d |
85 | for (i = 0; i < pp->argc; i++) { |
86 | if (pp->arg[i].reg != NULL) { |
232aca37 |
87 | fprintf(f, "\tmovl %d(%%esp), %%%s\n", |
c36e914d |
88 | (i + sarg_ofs) * 4, pp->arg[i].reg); |
232aca37 |
89 | } |
90 | } |
91 | |
c36e914d |
92 | fprintf(f, "\n\t# %s\n", pp->is_stdcall ? "__stdcall" : "__cdecl"); |
54e763a1 |
93 | fprintf(f, "\tcall %s\n\n", sym_out); |
232aca37 |
94 | |
c36e914d |
95 | if (args_repushed && !pp->is_stdcall) |
a51421fa |
96 | fprintf(f, "\tadd $%d,%%esp\n", args_repushed * 4); |
232aca37 |
97 | |
98 | // restore regs |
c36e914d |
99 | for (i = pp->argc - 1; i >= 0; i--) { |
100 | if (pp->arg[i].reg != NULL && is_x86_reg_saved(pp->arg[i].reg)) |
101 | fprintf(f, "\tpopl %%%s\n", pp->arg[i].reg); |
232aca37 |
102 | } |
103 | |
104 | fprintf(f, "\tret\n\n"); |
105 | } |
106 | |
54e763a1 |
107 | static void out_fromasm_x86(FILE *f, const char *sym, |
108 | const struct parsed_proto *pp) |
232aca37 |
109 | { |
232aca37 |
110 | int sarg_ofs = 1; // stack offset to args, in DWORDs |
7ae48d73 |
111 | int saved_regs = 0; |
4f12f671 |
112 | int argc_repush; |
232aca37 |
113 | int stack_args; |
7ae48d73 |
114 | int ret64; |
232aca37 |
115 | int i; |
116 | |
4f12f671 |
117 | argc_repush = pp->argc; |
118 | stack_args = pp->argc_stack; |
119 | if (pp->is_vararg) { |
120 | argc_repush = ARRAY_SIZE(pp->arg); // hopefully enough? |
121 | stack_args = argc_repush - pp->argc_reg; |
122 | } |
123 | |
7ae48d73 |
124 | ret64 = strstr(pp->ret_type.name, "int64") != NULL; |
125 | |
126 | fprintf(f, "# %s", pp->is_stdcall ? "__stdcall" : "__cdecl"); |
127 | if (ret64) |
128 | fprintf(f, " ret64"); |
129 | fprintf(f, "\n.global %s\n", sym); |
232aca37 |
130 | fprintf(f, "%s:\n", sym); |
131 | |
54e763a1 |
132 | if (pp->argc_reg == 0) { |
133 | //fprintf(f, "\tjmp _%s\n\n", sym); |
134 | fprintf(f, "\tjmp _%s", sym); |
135 | if (pp->is_stdcall && pp->argc > 0) |
136 | fprintf(f, "@%d", pp->argc * 4); |
137 | fprintf(f, "\n\n"); |
232aca37 |
138 | return; |
139 | } |
140 | |
7ae48d73 |
141 | // at least sc sub_47B150 needs edx to be preserved |
142 | // int64 returns use edx:eax - no edx save |
143 | // we use ecx also as scratch |
144 | fprintf(f, "\tpushl %%ecx\n"); |
145 | saved_regs++; |
232aca37 |
146 | sarg_ofs++; |
7ae48d73 |
147 | if (!ret64) { |
148 | fprintf(f, "\tpushl %%edx\n"); |
149 | saved_regs++; |
150 | sarg_ofs++; |
151 | } |
232aca37 |
152 | |
153 | // construct arg stack |
4f12f671 |
154 | for (i = argc_repush - 1; i >= 0; i--) { |
c36e914d |
155 | if (pp->arg[i].reg == NULL) { |
7ae48d73 |
156 | fprintf(f, "\tmovl %d(%%esp), %%ecx\n", |
232aca37 |
157 | (sarg_ofs + stack_args - 1) * 4); |
7ae48d73 |
158 | fprintf(f, "\tpushl %%ecx\n"); |
232aca37 |
159 | stack_args--; |
160 | } |
161 | else { |
7ae48d73 |
162 | if (IS(pp->arg[i].reg, "ecx")) |
163 | // must reload original ecx |
164 | fprintf(f, "\tmovl %d(%%esp), %%ecx\n", |
f3d05b09 |
165 | (sarg_ofs - 2) * 4); |
166 | |
c36e914d |
167 | fprintf(f, "\tpushl %%%s\n", pp->arg[i].reg); |
232aca37 |
168 | } |
169 | sarg_ofs++; |
170 | } |
171 | |
172 | // no worries about calling conventions - always __cdecl |
173 | fprintf(f, "\n\tcall _%s\n\n", sym); |
174 | |
7ae48d73 |
175 | if (sarg_ofs > saved_regs + 1) |
176 | fprintf(f, "\tadd $%d,%%esp\n", |
177 | (sarg_ofs - (saved_regs + 1)) * 4); |
232aca37 |
178 | |
7ae48d73 |
179 | if (!ret64) |
180 | fprintf(f, "\tpopl %%edx\n"); |
181 | fprintf(f, "\tpopl %%ecx\n"); |
232aca37 |
182 | |
c36e914d |
183 | if (pp->is_stdcall && pp->argc_stack) |
184 | fprintf(f, "\tret $%d\n\n", pp->argc_stack * 4); |
232aca37 |
185 | else |
186 | fprintf(f, "\tret\n\n"); |
187 | } |
188 | |
57e4efe9 |
189 | int main(int argc, char *argv[]) |
190 | { |
232aca37 |
191 | FILE *fout, *fsyms_to, *fsyms_from, *fhdr; |
bd96f656 |
192 | const struct parsed_proto *pp; |
57e4efe9 |
193 | char line[256]; |
54e763a1 |
194 | char sym_noat[256]; |
57e4efe9 |
195 | char sym[256]; |
54e763a1 |
196 | char *p; |
197 | int ret = 1; |
57e4efe9 |
198 | |
232aca37 |
199 | if (argc != 5) { |
200 | printf("usage:\n%s <bridge.s> <toasm_symf> <fromasm_symf> <hdrf>\n", |
57e4efe9 |
201 | argv[0]); |
202 | return 1; |
203 | } |
204 | |
232aca37 |
205 | hdrfn = argv[4]; |
57e4efe9 |
206 | fhdr = fopen(hdrfn, "r"); |
207 | my_assert_not(fhdr, NULL); |
208 | |
232aca37 |
209 | fsyms_from = fopen(argv[3], "r"); |
210 | my_assert_not(fsyms_from, NULL); |
211 | |
212 | fsyms_to = fopen(argv[2], "r"); |
213 | my_assert_not(fsyms_to, NULL); |
57e4efe9 |
214 | |
215 | fout = fopen(argv[1], "w"); |
216 | my_assert_not(fout, NULL); |
217 | |
218 | fprintf(fout, ".text\n\n"); |
232aca37 |
219 | fprintf(fout, "# to asm\n\n"); |
57e4efe9 |
220 | |
232aca37 |
221 | while (fgets(line, sizeof(line), fsyms_to)) |
57e4efe9 |
222 | { |
223 | next_word(sym, sizeof(sym), line); |
224 | if (sym[0] == 0 || sym[0] == ';' || sym[0] == '#') |
225 | continue; |
226 | |
54e763a1 |
227 | // IDA asm doesn't do '@' notation.. |
228 | strcpy(sym_noat, sym); |
229 | p = strchr(sym_noat, '@'); |
230 | if (p != NULL) |
231 | *p = 0; |
232 | |
233 | pp = proto_parse(fhdr, sym_noat); |
bd96f656 |
234 | if (pp == NULL) |
232aca37 |
235 | goto out; |
57e4efe9 |
236 | |
54e763a1 |
237 | out_toasm_x86(fout, sym, sym_noat, pp); |
232aca37 |
238 | } |
57e4efe9 |
239 | |
232aca37 |
240 | fprintf(fout, "# from asm\n\n"); |
57e4efe9 |
241 | |
232aca37 |
242 | while (fgets(line, sizeof(line), fsyms_from)) |
243 | { |
244 | next_word(sym, sizeof(sym), line); |
245 | if (sym[0] == 0 || sym[0] == ';' || sym[0] == '#') |
246 | continue; |
57e4efe9 |
247 | |
bd96f656 |
248 | pp = proto_parse(fhdr, sym); |
249 | if (pp == NULL) |
232aca37 |
250 | goto out; |
57e4efe9 |
251 | |
bd96f656 |
252 | out_fromasm_x86(fout, sym, pp); |
57e4efe9 |
253 | } |
254 | |
232aca37 |
255 | ret = 0; |
256 | out: |
57e4efe9 |
257 | fclose(fout); |
232aca37 |
258 | fclose(fsyms_to); |
259 | fclose(fsyms_from); |
260 | fclose(fhdr); |
261 | if (ret) |
262 | remove(argv[1]); |
263 | |
264 | return ret; |
57e4efe9 |
265 | } |