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 | |
bd2eb956 |
26 | // output decorated name |
27 | static const char *pp_to_name(const struct parsed_proto *pp) |
28 | { |
29 | static char buf[256]; |
30 | char atval[16]; |
31 | |
32 | if (!pp->is_fastcall && pp->argc_reg != 0) { |
33 | // can only be handled by __cdecl C func |
34 | snprintf(buf, sizeof(buf), "_%s", pp->name); |
35 | return buf; |
36 | } |
37 | |
38 | atval[0] = 0; |
39 | if (pp->is_stdcall) { |
40 | snprintf(atval, sizeof(atval), "@%d", |
41 | pp->argc * 4); |
42 | } |
43 | snprintf(buf, sizeof(buf), "%s%s%s", |
44 | pp->is_fastcall ? "@" : "_", |
45 | pp->name, atval); |
46 | |
47 | return buf; |
48 | } |
49 | |
50 | static void out_toasm_x86(FILE *f, const char *sym_out, |
51 | const struct parsed_proto *pp) |
232aca37 |
52 | { |
232aca37 |
53 | int must_save = 0; |
54 | int sarg_ofs = 1; // stack offset to args, in DWORDs |
55 | int args_repushed = 0; |
4f12f671 |
56 | int argc_repush; |
bd2eb956 |
57 | const char *name; |
232aca37 |
58 | int i; |
59 | |
4f12f671 |
60 | argc_repush = pp->argc; |
61 | if (pp->is_vararg) |
62 | argc_repush = ARRAY_SIZE(pp->arg); // hopefully enough? |
63 | |
c36e914d |
64 | for (i = 0; i < pp->argc; i++) { |
65 | if (pp->arg[i].reg != NULL) |
66 | must_save |= is_x86_reg_saved(pp->arg[i].reg); |
232aca37 |
67 | } |
68 | |
bd2eb956 |
69 | name = pp_to_name(pp); |
70 | fprintf(f, ".global %s\n", name); |
71 | fprintf(f, "%s:\n", name); |
232aca37 |
72 | |
c0050df6 |
73 | if (pp->argc_reg == 0 || pp->is_fastcall) { |
74 | fprintf(f, "\t# %s\n", |
75 | pp->is_fastcall ? "__fastcall" : |
76 | (pp->is_stdcall ? "__stdcall" : "__cdecl")); |
54e763a1 |
77 | fprintf(f, "\tjmp %s\n\n", sym_out); |
232aca37 |
78 | return; |
79 | } |
80 | |
4f12f671 |
81 | if (pp->argc_stack == 0 && !must_save && !pp->is_stdcall |
82 | && !pp->is_vararg) |
83 | { |
232aca37 |
84 | // load arg regs |
c36e914d |
85 | for (i = 0; i < pp->argc; i++) { |
232aca37 |
86 | fprintf(f, "\tmovl %d(%%esp), %%%s\n", |
c36e914d |
87 | (i + sarg_ofs) * 4, pp->arg[i].reg); |
232aca37 |
88 | } |
54e763a1 |
89 | fprintf(f, "\tjmp %s\n\n", sym_out); |
232aca37 |
90 | return; |
91 | } |
92 | |
93 | // save the regs |
c36e914d |
94 | for (i = 0; i < pp->argc; i++) { |
95 | if (pp->arg[i].reg != NULL && is_x86_reg_saved(pp->arg[i].reg)) { |
96 | fprintf(f, "\tpushl %%%s\n", pp->arg[i].reg); |
232aca37 |
97 | sarg_ofs++; |
98 | } |
99 | } |
100 | |
101 | // reconstruct arg stack |
4f12f671 |
102 | for (i = argc_repush - 1; i >= 0; i--) { |
c36e914d |
103 | if (pp->arg[i].reg == NULL) { |
232aca37 |
104 | fprintf(f, "\tmovl %d(%%esp), %%eax\n", |
105 | (i + sarg_ofs) * 4); |
106 | fprintf(f, "\tpushl %%eax\n"); |
107 | sarg_ofs++; |
108 | args_repushed++; |
109 | } |
110 | } |
4f12f671 |
111 | // my_assert(args_repushed, pp->argc_stack); |
232aca37 |
112 | |
113 | // load arg regs |
c36e914d |
114 | for (i = 0; i < pp->argc; i++) { |
115 | if (pp->arg[i].reg != NULL) { |
232aca37 |
116 | fprintf(f, "\tmovl %d(%%esp), %%%s\n", |
c36e914d |
117 | (i + sarg_ofs) * 4, pp->arg[i].reg); |
232aca37 |
118 | } |
119 | } |
120 | |
c36e914d |
121 | fprintf(f, "\n\t# %s\n", pp->is_stdcall ? "__stdcall" : "__cdecl"); |
54e763a1 |
122 | fprintf(f, "\tcall %s\n\n", sym_out); |
232aca37 |
123 | |
c36e914d |
124 | if (args_repushed && !pp->is_stdcall) |
a51421fa |
125 | fprintf(f, "\tadd $%d,%%esp\n", args_repushed * 4); |
232aca37 |
126 | |
127 | // restore regs |
c36e914d |
128 | for (i = pp->argc - 1; i >= 0; i--) { |
129 | if (pp->arg[i].reg != NULL && is_x86_reg_saved(pp->arg[i].reg)) |
130 | fprintf(f, "\tpopl %%%s\n", pp->arg[i].reg); |
232aca37 |
131 | } |
132 | |
133 | fprintf(f, "\tret\n\n"); |
134 | } |
135 | |
54e763a1 |
136 | static void out_fromasm_x86(FILE *f, const char *sym, |
137 | const struct parsed_proto *pp) |
232aca37 |
138 | { |
232aca37 |
139 | int sarg_ofs = 1; // stack offset to args, in DWORDs |
7ae48d73 |
140 | int saved_regs = 0; |
f2de0a97 |
141 | int c_is_stdcall; |
4f12f671 |
142 | int argc_repush; |
232aca37 |
143 | int stack_args; |
7ae48d73 |
144 | int ret64; |
232aca37 |
145 | int i; |
146 | |
4f12f671 |
147 | argc_repush = pp->argc; |
148 | stack_args = pp->argc_stack; |
149 | if (pp->is_vararg) { |
150 | argc_repush = ARRAY_SIZE(pp->arg); // hopefully enough? |
151 | stack_args = argc_repush - pp->argc_reg; |
152 | } |
153 | |
7ae48d73 |
154 | ret64 = strstr(pp->ret_type.name, "int64") != NULL; |
155 | |
c0050df6 |
156 | fprintf(f, "# %s", |
157 | pp->is_fastcall ? "__fastcall" : |
158 | (pp->is_stdcall ? "__stdcall" : "__cdecl")); |
7ae48d73 |
159 | if (ret64) |
160 | fprintf(f, " ret64"); |
161 | fprintf(f, "\n.global %s\n", sym); |
232aca37 |
162 | fprintf(f, "%s:\n", sym); |
163 | |
f2de0a97 |
164 | if ((pp->argc_reg == 0 || pp->is_fastcall) |
165 | && !IS(pp->name, "storm_491")) // wants edx save :( |
166 | { |
bd2eb956 |
167 | fprintf(f, "\tjmp %s\n\n", pp_to_name(pp)); |
232aca37 |
168 | return; |
169 | } |
170 | |
f2de0a97 |
171 | c_is_stdcall = (pp->argc_reg == 0 && pp->is_stdcall); |
172 | |
7ae48d73 |
173 | // at least sc sub_47B150 needs edx to be preserved |
174 | // int64 returns use edx:eax - no edx save |
175 | // we use ecx also as scratch |
176 | fprintf(f, "\tpushl %%ecx\n"); |
177 | saved_regs++; |
232aca37 |
178 | sarg_ofs++; |
7ae48d73 |
179 | if (!ret64) { |
180 | fprintf(f, "\tpushl %%edx\n"); |
181 | saved_regs++; |
182 | sarg_ofs++; |
183 | } |
232aca37 |
184 | |
185 | // construct arg stack |
4f12f671 |
186 | for (i = argc_repush - 1; i >= 0; i--) { |
c36e914d |
187 | if (pp->arg[i].reg == NULL) { |
7ae48d73 |
188 | fprintf(f, "\tmovl %d(%%esp), %%ecx\n", |
232aca37 |
189 | (sarg_ofs + stack_args - 1) * 4); |
7ae48d73 |
190 | fprintf(f, "\tpushl %%ecx\n"); |
232aca37 |
191 | stack_args--; |
192 | } |
193 | else { |
7ae48d73 |
194 | if (IS(pp->arg[i].reg, "ecx")) |
195 | // must reload original ecx |
196 | fprintf(f, "\tmovl %d(%%esp), %%ecx\n", |
f3d05b09 |
197 | (sarg_ofs - 2) * 4); |
198 | |
c36e914d |
199 | fprintf(f, "\tpushl %%%s\n", pp->arg[i].reg); |
232aca37 |
200 | } |
201 | sarg_ofs++; |
202 | } |
203 | |
bd2eb956 |
204 | fprintf(f, "\n\tcall %s\n\n", pp_to_name(pp)); |
232aca37 |
205 | |
f2de0a97 |
206 | if (!c_is_stdcall && sarg_ofs > saved_regs + 1) |
7ae48d73 |
207 | fprintf(f, "\tadd $%d,%%esp\n", |
208 | (sarg_ofs - (saved_regs + 1)) * 4); |
232aca37 |
209 | |
7ae48d73 |
210 | if (!ret64) |
211 | fprintf(f, "\tpopl %%edx\n"); |
212 | fprintf(f, "\tpopl %%ecx\n"); |
232aca37 |
213 | |
c36e914d |
214 | if (pp->is_stdcall && pp->argc_stack) |
215 | fprintf(f, "\tret $%d\n\n", pp->argc_stack * 4); |
232aca37 |
216 | else |
217 | fprintf(f, "\tret\n\n"); |
218 | } |
219 | |
57e4efe9 |
220 | int main(int argc, char *argv[]) |
221 | { |
232aca37 |
222 | FILE *fout, *fsyms_to, *fsyms_from, *fhdr; |
bd96f656 |
223 | const struct parsed_proto *pp; |
57e4efe9 |
224 | char line[256]; |
54e763a1 |
225 | char sym_noat[256]; |
57e4efe9 |
226 | char sym[256]; |
54e763a1 |
227 | char *p; |
228 | int ret = 1; |
57e4efe9 |
229 | |
232aca37 |
230 | if (argc != 5) { |
231 | printf("usage:\n%s <bridge.s> <toasm_symf> <fromasm_symf> <hdrf>\n", |
57e4efe9 |
232 | argv[0]); |
233 | return 1; |
234 | } |
235 | |
232aca37 |
236 | hdrfn = argv[4]; |
57e4efe9 |
237 | fhdr = fopen(hdrfn, "r"); |
238 | my_assert_not(fhdr, NULL); |
239 | |
232aca37 |
240 | fsyms_from = fopen(argv[3], "r"); |
241 | my_assert_not(fsyms_from, NULL); |
242 | |
243 | fsyms_to = fopen(argv[2], "r"); |
244 | my_assert_not(fsyms_to, NULL); |
57e4efe9 |
245 | |
246 | fout = fopen(argv[1], "w"); |
247 | my_assert_not(fout, NULL); |
248 | |
249 | fprintf(fout, ".text\n\n"); |
232aca37 |
250 | fprintf(fout, "# to asm\n\n"); |
57e4efe9 |
251 | |
232aca37 |
252 | while (fgets(line, sizeof(line), fsyms_to)) |
57e4efe9 |
253 | { |
254 | next_word(sym, sizeof(sym), line); |
255 | if (sym[0] == 0 || sym[0] == ';' || sym[0] == '#') |
256 | continue; |
257 | |
54e763a1 |
258 | // IDA asm doesn't do '@' notation.. |
259 | strcpy(sym_noat, sym); |
260 | p = strchr(sym_noat, '@'); |
261 | if (p != NULL) |
262 | *p = 0; |
263 | |
36595fd2 |
264 | pp = proto_parse(fhdr, sym_noat, 0); |
bd96f656 |
265 | if (pp == NULL) |
232aca37 |
266 | goto out; |
57e4efe9 |
267 | |
bd2eb956 |
268 | out_toasm_x86(fout, sym_noat, pp); |
232aca37 |
269 | } |
57e4efe9 |
270 | |
232aca37 |
271 | fprintf(fout, "# from asm\n\n"); |
57e4efe9 |
272 | |
232aca37 |
273 | while (fgets(line, sizeof(line), fsyms_from)) |
274 | { |
275 | next_word(sym, sizeof(sym), line); |
276 | if (sym[0] == 0 || sym[0] == ';' || sym[0] == '#') |
277 | continue; |
57e4efe9 |
278 | |
36595fd2 |
279 | pp = proto_parse(fhdr, sym, 0); |
bd96f656 |
280 | if (pp == NULL) |
232aca37 |
281 | goto out; |
57e4efe9 |
282 | |
bd96f656 |
283 | out_fromasm_x86(fout, sym, pp); |
57e4efe9 |
284 | } |
285 | |
232aca37 |
286 | ret = 0; |
287 | out: |
57e4efe9 |
288 | fclose(fout); |
232aca37 |
289 | fclose(fsyms_to); |
290 | fclose(fsyms_from); |
291 | fclose(fhdr); |
292 | if (ret) |
293 | remove(argv[1]); |
294 | |
295 | return ret; |
57e4efe9 |
296 | } |