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-rw-r--r--dyngen.c210
1 files changed, 155 insertions, 55 deletions
diff --git a/dyngen.c b/dyngen.c
index 40a7fc695b..9b2889b67a 100644
--- a/dyngen.c
+++ b/dyngen.c
@@ -28,7 +28,7 @@
#include "thunk.h"
/* all dynamically generated functions begin with this code */
-#define OP_PREFIX "op"
+#define OP_PREFIX "op_"
int elf_must_swap(Elf32_Ehdr *h)
{
@@ -201,7 +201,7 @@ int strstart(const char *str, const char *val, const char **ptr)
/* generate op code */
void gen_code(const char *name, unsigned long offset, unsigned long size,
FILE *outfile, uint8_t *text, void *relocs, int nb_relocs, int reloc_sh_type,
- Elf32_Sym *symtab, char *strtab)
+ Elf32_Sym *symtab, char *strtab, int gen_switch)
{
int copy_size = 0;
uint8_t *p_start, *p_end;
@@ -258,8 +258,6 @@ void gen_code(const char *name, unsigned long offset, unsigned long size,
if (n >= MAX_ARGS)
error("too many arguments in %s", name);
args_present[n - 1] = 1;
- } else {
- fprintf(outfile, "extern char %s;\n", sym_name);
}
}
}
@@ -274,8 +272,6 @@ void gen_code(const char *name, unsigned long offset, unsigned long size,
if (n >= MAX_ARGS)
error("too many arguments in %s", name);
args_present[n - 1] = 1;
- } else {
- fprintf(outfile, "extern char %s;\n", sym_name);
}
}
}
@@ -289,33 +285,59 @@ void gen_code(const char *name, unsigned long offset, unsigned long size,
error("inconsistent argument numbering in %s", name);
}
- /* output C code */
- fprintf(outfile, "extern void %s();\n", name);
- fprintf(outfile, "static inline void gen_%s(", name);
- if (nb_args == 0) {
- fprintf(outfile, "void");
- } else {
- for(i = 0; i < nb_args; i++) {
- if (i != 0)
- fprintf(outfile, ", ");
- fprintf(outfile, "long param%d", i + 1);
+ if (gen_switch) {
+
+ /* output C code */
+ fprintf(outfile, "case INDEX_%s: {\n", name);
+ if (nb_args > 0) {
+ fprintf(outfile, " long ");
+ for(i = 0; i < nb_args; i++) {
+ if (i != 0)
+ fprintf(outfile, ", ");
+ fprintf(outfile, "param%d", i + 1);
+ }
+ fprintf(outfile, ";\n");
}
- }
- fprintf(outfile, ")\n");
- fprintf(outfile, "{\n");
- fprintf(outfile, " memcpy(gen_code_ptr, &%s, %d);\n", name, copy_size);
-
- /* patch relocations */
- switch(e_machine) {
- case EM_386:
- {
+ fprintf(outfile, " extern void %s();\n", name);
+
+ if (reloc_sh_type == SHT_REL) {
Elf32_Rel *rel;
- char name[256];
- int type;
- long addend;
for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
+ if (!strstart(sym_name, "__op_param", &p)) {
+ fprintf(outfile, "extern char %s;\n", sym_name);
+ }
+ }
+ }
+ } else {
+ Elf32_Rela *rel;
+ for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
+ if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
+ sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
+ if (!strstart(sym_name, "__op_param", &p)) {
+ fprintf(outfile, "extern char %s;\n", sym_name);
+ }
+ }
+ }
+ }
+
+ fprintf(outfile, " memcpy(gen_code_ptr, &%s, %d);\n", name, copy_size);
+ for(i = 0; i < nb_args; i++) {
+ fprintf(outfile, " param%d = *opparam_ptr++;\n", i + 1);
+ }
+
+ /* patch relocations */
+ switch(e_machine) {
+ case EM_386:
+ {
+ Elf32_Rel *rel;
+ char name[256];
+ int type;
+ long addend;
+ for(i = 0, rel = relocs;i < nb_relocs; i++, rel++) {
+ if (rel->r_offset >= offset && rel->r_offset < offset + copy_size) {
+ sym_name = strtab + symtab[ELF32_R_SYM(rel->r_info)].st_name;
if (strstart(sym_name, "__op_param", &p)) {
snprintf(name, sizeof(name), "param%s", p);
} else {
@@ -336,20 +358,38 @@ void gen_code(const char *name, unsigned long offset, unsigned long size,
error("unsupported i386 relocation (%d)", type);
}
}
+ }
+ }
+ break;
+ default:
+ error("unsupported CPU for relocations (%d)", e_machine);
+ }
+ fprintf(outfile, " gen_code_ptr += %d;\n", copy_size);
+ fprintf(outfile, "}\n");
+ fprintf(outfile, "break;\n\n");
+ } else {
+ fprintf(outfile, "static inline void gen_%s(", name);
+ if (nb_args == 0) {
+ fprintf(outfile, "void");
+ } else {
+ for(i = 0; i < nb_args; i++) {
+ if (i != 0)
+ fprintf(outfile, ", ");
+ fprintf(outfile, "long param%d", i + 1);
}
}
- break;
- default:
- error("unsupported CPU for relocations (%d)", e_machine);
+ fprintf(outfile, ")\n");
+ fprintf(outfile, "{\n");
+ for(i = 0; i < nb_args; i++) {
+ fprintf(outfile, " *gen_opparam_ptr++ = param%d;\n", i + 1);
+ }
+ fprintf(outfile, " *gen_opc_ptr++ = INDEX_%s;\n", name);
+ fprintf(outfile, "}\n\n");
}
-
-
- fprintf(outfile, " gen_code_ptr += %d;\n", copy_size);
- fprintf(outfile, "}\n\n");
}
/* load an elf object file */
-int load_elf(const char *filename, FILE *outfile)
+int load_elf(const char *filename, FILE *outfile, int do_print_enum)
{
int fd;
Elf32_Ehdr ehdr;
@@ -476,23 +516,77 @@ int load_elf(const char *filename, FILE *outfile)
error("unsupported CPU (e_machine=%d)", e_machine);
}
- fprintf(outfile, "#include \"gen-%s.h\"\n\n", cpu_name);
+ if (do_print_enum) {
+ fprintf(outfile, "DEF(end)\n");
+ for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
+ const char *name, *p;
+ name = strtab + sym->st_name;
+ if (strstart(name, OP_PREFIX, &p)) {
+ fprintf(outfile, "DEF(%s)\n", p);
+ }
+ }
+ } else {
+ /* generate big code generation switch */
+fprintf(outfile,
+"int dyngen_code(uint8_t *gen_code_buf,\n"
+" const uint16_t *opc_buf, const uint32_t *opparam_buf)\n"
+"{\n"
+" uint8_t *gen_code_ptr;\n"
+" const uint16_t *opc_ptr;\n"
+" const uint32_t *opparam_ptr;\n"
+" gen_code_ptr = gen_code_buf;\n"
+" opc_ptr = opc_buf;\n"
+" opparam_ptr = opparam_buf;\n"
+" for(;;) {\n"
+" switch(*opc_ptr++) {\n"
+);
- for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
- const char *name;
- name = strtab + sym->st_name;
- if (strstart(name, "op_", NULL) ||
- strstart(name, "op1_", NULL) ||
- strstart(name, "op2_", NULL) ||
- strstart(name, "op3_", NULL)) {
+ for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
+ const char *name;
+ name = strtab + sym->st_name;
+ if (strstart(name, OP_PREFIX, NULL)) {
#if 0
- printf("%4d: %s pos=0x%08x len=%d\n",
- i, name, sym->st_value, sym->st_size);
+ printf("%4d: %s pos=0x%08x len=%d\n",
+ i, name, sym->st_value, sym->st_size);
#endif
- if (sym->st_shndx != (text_sec - shdr))
- error("invalid section for opcode (0x%x)", sym->st_shndx);
- gen_code(name, sym->st_value, sym->st_size, outfile,
- text, relocs, nb_relocs, reloc_sh_type, symtab, strtab);
+ if (sym->st_shndx != (text_sec - shdr))
+ error("invalid section for opcode (0x%x)", sym->st_shndx);
+ gen_code(name, sym->st_value, sym->st_size, outfile,
+ text, relocs, nb_relocs, reloc_sh_type, symtab, strtab, 1);
+ }
+ }
+
+fprintf(outfile,
+" default:\n"
+" goto the_end;\n"
+" }\n"
+" }\n"
+" the_end:\n"
+);
+
+/* generate a return */
+ switch(e_machine) {
+ case EM_386:
+ fprintf(outfile, "*gen_code_ptr++ = 0xc3; /* ret */\n");
+ break;
+ default:
+ error("no return generation for cpu '%s'", cpu_name);
+ }
+
+ fprintf(outfile, "return gen_code_ptr - gen_code_buf;\n");
+ fprintf(outfile, "}\n\n");
+
+/* generate gen_xxx functions */
+/* XXX: suppress the use of these functions to simplify code */
+ for(i = 0, sym = symtab; i < nb_syms; i++, sym++) {
+ const char *name;
+ name = strtab + sym->st_name;
+ if (strstart(name, OP_PREFIX, NULL)) {
+ if (sym->st_shndx != (text_sec - shdr))
+ error("invalid section for opcode (0x%x)", sym->st_shndx);
+ gen_code(name, sym->st_value, sym->st_size, outfile,
+ text, relocs, nb_relocs, reloc_sh_type, symtab, strtab, 0);
+ }
}
}
@@ -503,20 +597,23 @@ int load_elf(const char *filename, FILE *outfile)
void usage(void)
{
printf("dyngen (c) 2003 Fabrice Bellard\n"
- "usage: dyngen [-o outfile] objfile\n"
- "Generate a dynamic code generator from an object file\n");
+ "usage: dyngen [-o outfile] [-c] objfile\n"
+ "Generate a dynamic code generator from an object file\n"
+ "-c output enum of operations\n"
+ );
exit(1);
}
int main(int argc, char **argv)
{
- int c;
+ int c, do_print_enum;
const char *filename, *outfilename;
FILE *outfile;
outfilename = "out.c";
+ do_print_enum = 0;
for(;;) {
- c = getopt(argc, argv, "ho:");
+ c = getopt(argc, argv, "ho:c");
if (c == -1)
break;
switch(c) {
@@ -526,6 +623,9 @@ int main(int argc, char **argv)
case 'o':
outfilename = optarg;
break;
+ case 'c':
+ do_print_enum = 1;
+ break;
}
}
if (optind >= argc)
@@ -534,7 +634,7 @@ int main(int argc, char **argv)
outfile = fopen(outfilename, "w");
if (!outfile)
error("could not open '%s'", outfilename);
- load_elf(filename, outfile);
+ load_elf(filename, outfile, do_print_enum);
fclose(outfile);
return 0;
}
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-15 16:28:49 +0000