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refactoring mcexec's main() in preparation for execve()

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This commit is contained in:
Balazs Gerofi bgerofi@riken.jp
2014-05-21 21:55:49 +09:00
parent f90e294384
commit f810aa56b8
1 changed files with 49 additions and 36 deletions
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85
executer/user/mcexec.c
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@ -335,6 +335,53 @@ struct program_load_desc *load_interp(struct program_load_desc *desc0, FILE *fp)
unsigned char *dma_buf;
int load_elf_desc(char *filename, struct program_load_desc **desc_p)
{
FILE *fp;
FILE *interp = NULL;
char *interp_path;
struct program_load_desc *desc;
fp = fopen(filename, "rb");
if (!fp) {
fprintf(stderr, "Error: Failed to open %s\n", filename);
return 1;
}
desc = load_elf(fp, &interp_path);
if (!desc) {
fclose(fp);
fprintf(stderr, "Error: Failed to parse ELF!\n");
return 1;
}
if (interp_path) {
char *path;
path = search_file(interp_path, X_OK);
if (!path) {
fprintf(stderr, "Error: interp not found: %s\n", interp_path);
return 1;
}
interp = fopen(path, "rb");
if (!interp) {
fprintf(stderr, "Error: Failed to open %s\n", path);
return 1;
}
desc = load_interp(desc, interp);
if (!desc) {
fprintf(stderr, "Error: Failed to parse interp!\n");
return 1;
}
}
__dprintf("# of sections: %d\n", desc->num_sections);
*desc_p = desc;
return 0;
}
#define PAGE_SIZE 4096
#define PAGE_MASK ~((unsigned long)PAGE_SIZE - 1)
@ -650,7 +697,6 @@ int main(int argc, char **argv)
int fdm;
long r;
#endif
FILE *fp;
struct program_load_desc *desc;
int envs_len;
char *envs;
@ -658,9 +704,6 @@ int main(int argc, char **argv)
char **a;
char *p;
int i;
FILE *interp = NULL;
char *interp_path;
char *path;
int error;
struct rlimit rlim_stack;
unsigned long lcur;
@ -741,40 +784,10 @@ int main(int argc, char **argv)
}
__dprintf("\n");
fp = fopen(argv[1], "rb");
if (!fp) {
fprintf(stderr, "Error: Failed to open %s\n", argv[1]);
if (load_elf_desc(argv[1], &desc) != 0) {
fprintf(stderr, "error: loading file: %s\n", argv[1]);
return 1;
}
desc = load_elf(fp, &interp_path);
if (!desc) {
fclose(fp);
fprintf(stderr, "Error: Failed to parse ELF!\n");
return 1;
}
if (interp_path) {
path = search_file(interp_path, X_OK);
if (!path) {
fprintf(stderr, "Error: interp not found: %s\n", interp_path);
return 1;
}
interp = fopen(path, "rb");
if (!interp) {
fprintf(stderr, "Error: Failed to open %s\n", path);
return 1;
}
desc = load_interp(desc, interp);
if (!desc) {
fprintf(stderr, "Error: Failed to parse interp!\n");
return 1;
}
}
__dprintf("# of sections: %d\n", desc->num_sections);
desc->envs_len = envs_len;
desc->envs = envs;