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sym.c
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sym.c
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/* MSPDebug - debugging tool for the eZ430
* Copyright (C) 2009, 2010 Daniel Beer
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdint.h>
#include <regex.h>
#include <errno.h>
#include "stab.h"
#include "expr.h"
#include "binfile.h"
#include "util.h"
#include "vector.h"
#include "sym.h"
static int cmd_eval(cproc_t cp, char **arg)
{
stab_t stab = cproc_stab(cp);
int addr;
uint16_t offset;
char name[64];
if (expr_eval(stab, *arg, &addr) < 0) {
fprintf(stderr, "=: can't parse: %s\n", *arg);
return -1;
}
printf("0x%04x", addr);
if (!stab_nearest(stab, addr, name, sizeof(name), &offset)) {
printf(" = %s", name);
if (offset)
printf("+0x%x", offset);
}
printf("\n");
return 0;
}
static int cmd_sym_load_add(cproc_t cp, int clear, char **arg)
{
stab_t stab = cproc_stab(cp);
FILE *in;
if (clear && cproc_prompt_abort(cp, CPROC_MODIFY_SYMS))
return 0;
in = fopen(*arg, "r");
if (!in) {
fprintf(stderr, "sym: %s: %s\n", *arg, strerror(errno));
return -1;
}
if (clear) {
stab_clear(stab);
cproc_unmodify(cp, CPROC_MODIFY_SYMS);
} else {
cproc_modify(cp, CPROC_MODIFY_SYMS);
}
if (binfile_syms(in, stab) < 0) {
fclose(in);
return -1;
}
fclose(in);
return 0;
}
static int savemap_cb(void *user_data, const char *name, uint16_t value)
{
FILE *savemap_out = (FILE *)user_data;
if (fprintf(savemap_out, "%04x t %s\n", value, name) < 0) {
perror("sym: can't write to file");
return -1;
}
return 0;
}
static int cmd_sym_savemap(cproc_t cp, char **arg)
{
stab_t stab = cproc_stab(cp);
FILE *savemap_out;
char *fname = get_arg(arg);
if (!fname) {
fprintf(stderr, "sym: filename required to save map\n");
return -1;
}
savemap_out = fopen(fname, "w");
if (!savemap_out) {
fprintf(stderr, "sym: couldn't write to %s: %s\n", fname,
strerror(errno));
return -1;
}
if (stab_enum(stab, savemap_cb, savemap_out) < 0) {
fclose(savemap_out);
return -1;
}
if (fclose(savemap_out) < 0) {
fprintf(stderr, "sym: error on close: %s\n", strerror(errno));
return -1;
}
cproc_unmodify(cp, CPROC_MODIFY_SYMS);
return 0;
}
static int print_sym(void *user_data, const char *name, uint16_t value)
{
printf("0x%04x: %s\n", value, name);
return 0;
}
static int find_sym(void *user_data, const char *name, uint16_t value)
{
regex_t *find_preg = (regex_t *)user_data;
if (!regexec(find_preg, name, 0, NULL, 0))
printf("0x%04x: %s\n", value, name);
return 0;
}
static int cmd_sym_find(cproc_t cp, char **arg)
{
stab_t stab = cproc_stab(cp);
regex_t find_preg;
char *expr = get_arg(arg);
if (!expr) {
stab_enum(stab, print_sym, NULL);
return 0;
}
if (regcomp(&find_preg, expr, REG_EXTENDED | REG_NOSUB)) {
fprintf(stderr, "sym: failed to compile: %s\n", expr);
return -1;
}
stab_enum(stab, find_sym, &find_preg);
regfree(&find_preg);
return 0;
}
struct rename_record {
char old_name[64];
int start, end;
};
struct rename_data {
struct vector list;
regex_t preg;
};
static int renames_do(stab_t stab,
struct rename_data *rename, const char *replace)
{
int i;
int count = 0;
for (i = 0; i < rename->list.size; i++) {
struct rename_record *r =
VECTOR_PTR(rename->list, i, struct rename_record);
char new_name[128];
int len = r->start;
int value;
if (len + 1 > sizeof(new_name))
len = sizeof(new_name) - 1;
memcpy(new_name, r->old_name, len);
snprintf(new_name + len,
sizeof(new_name) - len,
"%s%s", replace, r->old_name + r->end);
printf("%s -> %s\n", r->old_name, new_name);
if (stab_get(stab, r->old_name, &value) < 0) {
fprintf(stderr, "sym: warning: "
"symbol missing: %s\n",
r->old_name);
} else {
stab_del(stab, r->old_name);
if (stab_set(stab, new_name, value) < 0) {
fprintf(stderr, "sym: warning: "
"failed to set new name: %s\n",
new_name);
}
}
count++;
}
printf("%d symbols renamed\n", count);
return 0;
}
static int find_renames(void *user_data, const char *name, uint16_t value)
{
struct rename_data *rename = (struct rename_data *)user_data;
regmatch_t pmatch;
if (!regexec(&rename->preg, name, 1, &pmatch, 0) &&
pmatch.rm_so >= 0 && pmatch.rm_eo > pmatch.rm_so) {
struct rename_record r;
strncpy(r.old_name, name, sizeof(r.old_name));
r.old_name[sizeof(r.old_name) - 1] = 0;
r.start = pmatch.rm_so;
r.end = pmatch.rm_eo;
return vector_push(&rename->list, &r, 1);
}
return 0;
}
static int cmd_sym_rename(cproc_t cp, char **arg)
{
const char *expr = get_arg(arg);
const char *replace = get_arg(arg);
int ret;
struct rename_data rename;
stab_t stab = cproc_stab(cp);
if (!(expr && replace)) {
fprintf(stderr, "sym: expected pattern and replacement\n");
return -1;
}
if (regcomp(&rename.preg, expr, REG_EXTENDED)) {
fprintf(stderr, "sym: failed to compile: %s\n", expr);
return -1;
}
vector_init(&rename.list, sizeof(struct rename_record));
if (stab_enum(stab, find_renames, &rename) < 0) {
fprintf(stderr, "sym: rename failed\n");
regfree(&rename.preg);
vector_destroy(&rename.list);
return -1;
}
regfree(&rename.preg);
ret = renames_do(stab, &rename, replace);
vector_destroy(&rename.list);
if (ret > 0)
cproc_modify(cp, CPROC_MODIFY_SYMS);
return ret >= 0 ? 0 : -1;
}
static int cmd_sym_del(cproc_t cp, char **arg)
{
stab_t stab = cproc_stab(cp);
char *name = get_arg(arg);
if (!name) {
fprintf(stderr, "sym: need a name to delete "
"symbol table entries\n");
return -1;
}
if (stab_del(stab, name) < 0) {
fprintf(stderr, "sym: can't delete nonexistent symbol: %s\n",
name);
return -1;
}
cproc_modify(cp, CPROC_MODIFY_SYMS);
return 0;
}
static int cmd_sym(cproc_t cp, char **arg)
{
stab_t stab = cproc_stab(cp);
char *subcmd = get_arg(arg);
if (!subcmd) {
fprintf(stderr, "sym: need to specify a subcommand "
"(try \"help sym\")\n");
return -1;
}
if (!strcasecmp(subcmd, "clear")) {
if (cproc_prompt_abort(cp, CPROC_MODIFY_SYMS))
return 0;
stab_clear(stab);
cproc_unmodify(cp, CPROC_MODIFY_SYMS);
return 0;
}
if (!strcasecmp(subcmd, "set")) {
char *name = get_arg(arg);
char *val_text = get_arg(arg);
int value;
if (!(name && val_text)) {
fprintf(stderr, "sym: need a name and value to set "
"symbol table entries\n");
return -1;
}
if (expr_eval(stab, val_text, &value) < 0) {
fprintf(stderr, "sym: can't parse value: %s\n",
val_text);
return -1;
}
if (stab_set(stab, name, value) < 0)
return -1;
cproc_modify(cp, CPROC_MODIFY_SYMS);
return 0;
}
if (!strcasecmp(subcmd, "del"))
return cmd_sym_del(cp, arg);
if (!strcasecmp(subcmd, "import"))
return cmd_sym_load_add(cp, 1, arg);
if (!strcasecmp(subcmd, "import+"))
return cmd_sym_load_add(cp, 0, arg);
if (!strcasecmp(subcmd, "export"))
return cmd_sym_savemap(cp, arg);
if (!strcasecmp(subcmd, "rename"))
return cmd_sym_rename(cp, arg);
if (!strcasecmp(subcmd, "find"))
return cmd_sym_find(cp, arg);
fprintf(stderr, "sym: unknown subcommand: %s\n", subcmd);
return -1;
}
static const struct cproc_command commands[] = {
{
.name = "=",
.func = cmd_eval,
.help =
"= <expression>\n"
" Evaluate an expression using the symbol table.\n"
},
{
.name = "sym",
.func = cmd_sym,
.help =
"sym clear\n"
" Clear the symbol table.\n"
"sym set <name> <value>\n"
" Set or overwrite the value of a symbol.\n"
"sym del <name>\n"
" Delete a symbol from the symbol table.\n"
"sym import <filename>\n"
" Load symbols from the given file.\n"
"sym import+ <filename>\n"
" Load additional symbols from the given file.\n"
"sym export <filename>\n"
" Save the current symbols to a BSD-style symbol file.\n"
"sym find <regex>\n"
" Search for symbols by regular expression.\n"
"sym rename <regex> <string>\n"
" Replace every occurance of a pattern in symbol names.\n"
}
};
int sym_register(cproc_t cp)
{
return cproc_register_commands(cp, commands, ARRAY_LEN(commands));
}