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 |
4f12f671 |
111 | int argc_repush; |
232aca37 |
112 | int stack_args; |
113 | int i; |
114 | |
4f12f671 |
115 | argc_repush = pp->argc; |
116 | stack_args = pp->argc_stack; |
117 | if (pp->is_vararg) { |
118 | argc_repush = ARRAY_SIZE(pp->arg); // hopefully enough? |
119 | stack_args = argc_repush - pp->argc_reg; |
120 | } |
121 | |
c36e914d |
122 | fprintf(f, "# %s\n", pp->is_stdcall ? "__stdcall" : "__cdecl"); |
232aca37 |
123 | fprintf(f, ".global %s\n", sym); |
124 | fprintf(f, "%s:\n", sym); |
125 | |
54e763a1 |
126 | if (pp->argc_reg == 0) { |
127 | //fprintf(f, "\tjmp _%s\n\n", sym); |
128 | fprintf(f, "\tjmp _%s", sym); |
129 | if (pp->is_stdcall && pp->argc > 0) |
130 | fprintf(f, "@%d", pp->argc * 4); |
131 | fprintf(f, "\n\n"); |
232aca37 |
132 | return; |
133 | } |
134 | |
2b43685d |
135 | // scratch reg, must not be eax or edx (for ret edx:eax) |
136 | fprintf(f, "\tpushl %%ebx\n"); |
232aca37 |
137 | sarg_ofs++; |
138 | |
139 | // construct arg stack |
4f12f671 |
140 | for (i = argc_repush - 1; i >= 0; i--) { |
c36e914d |
141 | if (pp->arg[i].reg == NULL) { |
2b43685d |
142 | fprintf(f, "\tmovl %d(%%esp), %%ebx\n", |
232aca37 |
143 | (sarg_ofs + stack_args - 1) * 4); |
2b43685d |
144 | fprintf(f, "\tpushl %%ebx\n"); |
232aca37 |
145 | stack_args--; |
146 | } |
147 | else { |
2b43685d |
148 | if (IS(pp->arg[i].reg, "ebx")) |
149 | // must reload original ebx |
150 | fprintf(f, "\tmovl %d(%%esp), %%ebx\n", |
f3d05b09 |
151 | (sarg_ofs - 2) * 4); |
152 | |
c36e914d |
153 | fprintf(f, "\tpushl %%%s\n", pp->arg[i].reg); |
232aca37 |
154 | } |
155 | sarg_ofs++; |
156 | } |
157 | |
158 | // no worries about calling conventions - always __cdecl |
159 | fprintf(f, "\n\tcall _%s\n\n", sym); |
160 | |
161 | if (sarg_ofs > 2) |
a51421fa |
162 | fprintf(f, "\tadd $%d,%%esp\n", (sarg_ofs - 2) * 4); |
232aca37 |
163 | |
2b43685d |
164 | fprintf(f, "\tpopl %%ebx\n"); |
232aca37 |
165 | |
c36e914d |
166 | if (pp->is_stdcall && pp->argc_stack) |
167 | fprintf(f, "\tret $%d\n\n", pp->argc_stack * 4); |
232aca37 |
168 | else |
169 | fprintf(f, "\tret\n\n"); |
170 | } |
171 | |
57e4efe9 |
172 | int main(int argc, char *argv[]) |
173 | { |
232aca37 |
174 | FILE *fout, *fsyms_to, *fsyms_from, *fhdr; |
bd96f656 |
175 | const struct parsed_proto *pp; |
57e4efe9 |
176 | char line[256]; |
54e763a1 |
177 | char sym_noat[256]; |
57e4efe9 |
178 | char sym[256]; |
54e763a1 |
179 | char *p; |
180 | int ret = 1; |
57e4efe9 |
181 | |
232aca37 |
182 | if (argc != 5) { |
183 | printf("usage:\n%s <bridge.s> <toasm_symf> <fromasm_symf> <hdrf>\n", |
57e4efe9 |
184 | argv[0]); |
185 | return 1; |
186 | } |
187 | |
232aca37 |
188 | hdrfn = argv[4]; |
57e4efe9 |
189 | fhdr = fopen(hdrfn, "r"); |
190 | my_assert_not(fhdr, NULL); |
191 | |
232aca37 |
192 | fsyms_from = fopen(argv[3], "r"); |
193 | my_assert_not(fsyms_from, NULL); |
194 | |
195 | fsyms_to = fopen(argv[2], "r"); |
196 | my_assert_not(fsyms_to, NULL); |
57e4efe9 |
197 | |
198 | fout = fopen(argv[1], "w"); |
199 | my_assert_not(fout, NULL); |
200 | |
201 | fprintf(fout, ".text\n\n"); |
232aca37 |
202 | fprintf(fout, "# to asm\n\n"); |
57e4efe9 |
203 | |
232aca37 |
204 | while (fgets(line, sizeof(line), fsyms_to)) |
57e4efe9 |
205 | { |
206 | next_word(sym, sizeof(sym), line); |
207 | if (sym[0] == 0 || sym[0] == ';' || sym[0] == '#') |
208 | continue; |
209 | |
54e763a1 |
210 | // IDA asm doesn't do '@' notation.. |
211 | strcpy(sym_noat, sym); |
212 | p = strchr(sym_noat, '@'); |
213 | if (p != NULL) |
214 | *p = 0; |
215 | |
216 | pp = proto_parse(fhdr, sym_noat); |
bd96f656 |
217 | if (pp == NULL) |
232aca37 |
218 | goto out; |
57e4efe9 |
219 | |
54e763a1 |
220 | out_toasm_x86(fout, sym, sym_noat, pp); |
232aca37 |
221 | } |
57e4efe9 |
222 | |
232aca37 |
223 | fprintf(fout, "# from asm\n\n"); |
57e4efe9 |
224 | |
232aca37 |
225 | while (fgets(line, sizeof(line), fsyms_from)) |
226 | { |
227 | next_word(sym, sizeof(sym), line); |
228 | if (sym[0] == 0 || sym[0] == ';' || sym[0] == '#') |
229 | continue; |
57e4efe9 |
230 | |
bd96f656 |
231 | pp = proto_parse(fhdr, sym); |
232 | if (pp == NULL) |
232aca37 |
233 | goto out; |
57e4efe9 |
234 | |
bd96f656 |
235 | out_fromasm_x86(fout, sym, pp); |
57e4efe9 |
236 | } |
237 | |
232aca37 |
238 | ret = 0; |
239 | out: |
57e4efe9 |
240 | fclose(fout); |
232aca37 |
241 | fclose(fsyms_to); |
242 | fclose(fsyms_from); |
243 | fclose(fhdr); |
244 | if (ret) |
245 | remove(argv[1]); |
246 | |
247 | return ret; |
57e4efe9 |
248 | } |