8 #define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
9 #define IS(w, y) !strcmp(w, y)
11 #include "protoparse.h"
13 static int is_x86_reg_saved(const char *reg)
15 static const char *nosave_regs[] = { "eax", "edx", "ecx" };
19 for (r = 0; r < ARRAY_SIZE(nosave_regs); r++)
20 if (strcmp(reg, nosave_regs[r]) == 0)
26 static void out_toasm_x86(FILE *f, char *sym, struct parsed_proto *pp)
29 int sarg_ofs = 1; // stack offset to args, in DWORDs
30 int args_repushed = 0;
33 for (i = 0; i < pp->argc; i++) {
34 if (pp->arg[i].reg != NULL)
35 must_save |= is_x86_reg_saved(pp->arg[i].reg);
38 fprintf(f, ".global _%s\n", sym);
39 fprintf(f, "_%s:\n", sym);
41 if (pp->argc_reg == 0 && !pp->is_stdcall) {
42 fprintf(f, "\tjmp %s\n\n", sym);
46 if (pp->argc_stack == 0 && !must_save && !pp->is_stdcall) {
48 for (i = 0; i < pp->argc; i++) {
49 fprintf(f, "\tmovl %d(%%esp), %%%s\n",
50 (i + sarg_ofs) * 4, pp->arg[i].reg);
52 fprintf(f, "\tjmp %s\n\n", sym);
57 for (i = 0; i < pp->argc; i++) {
58 if (pp->arg[i].reg != NULL && is_x86_reg_saved(pp->arg[i].reg)) {
59 fprintf(f, "\tpushl %%%s\n", pp->arg[i].reg);
64 // reconstruct arg stack
65 for (i = pp->argc - 1; i >= 0; i--) {
66 if (pp->arg[i].reg == NULL) {
67 fprintf(f, "\tmovl %d(%%esp), %%eax\n",
69 fprintf(f, "\tpushl %%eax\n");
74 my_assert(args_repushed, pp->argc_stack);
77 for (i = 0; i < pp->argc; i++) {
78 if (pp->arg[i].reg != NULL) {
79 fprintf(f, "\tmovl %d(%%esp), %%%s\n",
80 (i + sarg_ofs) * 4, pp->arg[i].reg);
84 fprintf(f, "\n\t# %s\n", pp->is_stdcall ? "__stdcall" : "__cdecl");
85 fprintf(f, "\tcall %s\n\n", sym);
87 if (args_repushed && !pp->is_stdcall)
88 fprintf(f, "\tadd $%d,%%esp\n", args_repushed * 4);
91 for (i = pp->argc - 1; i >= 0; i--) {
92 if (pp->arg[i].reg != NULL && is_x86_reg_saved(pp->arg[i].reg))
93 fprintf(f, "\tpopl %%%s\n", pp->arg[i].reg);
96 fprintf(f, "\tret\n\n");
99 static void out_fromasm_x86(FILE *f, char *sym, struct parsed_proto *pp)
101 int sarg_ofs = 1; // stack offset to args, in DWORDs
105 fprintf(f, "# %s\n", pp->is_stdcall ? "__stdcall" : "__cdecl");
106 fprintf(f, ".global %s\n", sym);
107 fprintf(f, "%s:\n", sym);
109 if (pp->argc_reg == 0 && !pp->is_stdcall) {
110 fprintf(f, "\tjmp _%s\n\n", sym);
114 fprintf(f, "\tpushl %%edx\n"); // just in case..
117 // construct arg stack
118 stack_args = pp->argc_stack;
119 for (i = pp->argc - 1; i >= 0; i--) {
120 if (pp->arg[i].reg == NULL) {
121 fprintf(f, "\tmovl %d(%%esp), %%edx\n",
122 (sarg_ofs + stack_args - 1) * 4);
123 fprintf(f, "\tpushl %%edx\n");
127 if (IS(pp->arg[i].reg, "edx"))
128 // must reload original edx
129 fprintf(f, "\tmovl %d(%%esp), %%edx\n",
132 fprintf(f, "\tpushl %%%s\n", pp->arg[i].reg);
137 // no worries about calling conventions - always __cdecl
138 fprintf(f, "\n\tcall _%s\n\n", sym);
141 fprintf(f, "\tadd $%d,%%esp\n", (sarg_ofs - 2) * 4);
143 fprintf(f, "\tpopl %%edx\n");
145 if (pp->is_stdcall && pp->argc_stack)
146 fprintf(f, "\tret $%d\n\n", pp->argc_stack * 4);
148 fprintf(f, "\tret\n\n");
151 int main(int argc, char *argv[])
153 FILE *fout, *fsyms_to, *fsyms_from, *fhdr;
154 struct parsed_proto pp;
160 printf("usage:\n%s <bridge.s> <toasm_symf> <fromasm_symf> <hdrf>\n",
166 fhdr = fopen(hdrfn, "r");
167 my_assert_not(fhdr, NULL);
169 fsyms_from = fopen(argv[3], "r");
170 my_assert_not(fsyms_from, NULL);
172 fsyms_to = fopen(argv[2], "r");
173 my_assert_not(fsyms_to, NULL);
175 fout = fopen(argv[1], "w");
176 my_assert_not(fout, NULL);
178 fprintf(fout, ".text\n\n");
179 fprintf(fout, "# to asm\n\n");
181 while (fgets(line, sizeof(line), fsyms_to))
183 next_word(sym, sizeof(sym), line);
184 if (sym[0] == 0 || sym[0] == ';' || sym[0] == '#')
187 ret = proto_parse(fhdr, sym, &pp);
191 out_toasm_x86(fout, sym, &pp);
195 fprintf(fout, "# from asm\n\n");
197 while (fgets(line, sizeof(line), fsyms_from))
199 next_word(sym, sizeof(sym), line);
200 if (sym[0] == 0 || sym[0] == ';' || sym[0] == '#')
203 ret = proto_parse(fhdr, sym, &pp);
207 out_fromasm_x86(fout, sym, &pp);