04bd965143
Offline SMMSTORE variable modification tool. Can be used to pre-configure ROM image or debug EFI state stored in a dump. Change-Id: I6c1c06f1d0c39c13b5be76a3070f09b715aca6e0 Signed-off-by: Sergii Dmytruk <sergii.dmytruk@3mdeb.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/79080 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Michał Żygowski <michal.zygowski@3mdeb.com> Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
112 lines
2.2 KiB
C
112 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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#include "utils.h"
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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void *xmalloc(size_t size)
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{
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void *p = malloc(size);
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if (p == NULL) {
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fprintf(stderr, "Failed to allocate memory\n");
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abort();
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}
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return p;
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}
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char *to_chars(const CHAR16 uchars[], size_t size)
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{
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char *chars = xmalloc(size / 2 + 1);
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const CHAR16 *from = uchars;
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char *to = chars;
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while (*from != 0) {
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CHAR16 uc = *from++;
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if (uc < CHAR_MAX)
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*to++ = uc;
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else
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*to++ = '?';
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}
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// In case there was no terminating NUL.
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if (to != chars && to[-1] != '\0')
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*to = '\0';
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return chars;
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}
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CHAR16 *to_uchars(const char chars[], size_t *size)
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{
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*size = (strlen(chars) + 1) * 2;
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CHAR16 *uchars = xmalloc(*size);
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const char *from = chars;
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CHAR16 *to = uchars;
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while (*from != '\0')
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*to++ = *from++;
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*to = 0;
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return uchars;
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}
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bool str_eq(const char lhs[], const char rhs[])
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{
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return strcmp(lhs, rhs) == 0;
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}
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struct mem_range_t map_file(const char path[], bool rw)
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{
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struct mem_range_t range = {0};
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int open_flags = rw ? O_RDWR : O_RDONLY;
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int mmap_flags = rw ? PROT_READ | PROT_WRITE : PROT_READ;
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int fd = open(path, open_flags);
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if (fd == -1) {
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fprintf(stderr, "Failed to open(): %s\n", strerror(errno));
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return range;
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}
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struct stat stat_buf;
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if (fstat(fd, &stat_buf) != 0) {
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(void)close(fd);
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fprintf(stderr, "Failed to fstat(): %s\n", strerror(errno));
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return range;
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}
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if (stat_buf.st_size == 0) {
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(void)close(fd);
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fprintf(stderr, "Can't map an empty \"%s\" file\n", path);
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return range;
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}
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uint8_t *mem = mmap(/*addr=*/NULL, stat_buf.st_size, mmap_flags,
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MAP_SHARED | MAP_POPULATE, fd, /*offset=*/0);
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(void)close(fd);
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if (mem == MAP_FAILED) {
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fprintf(stderr, "Failed to mmap(): %s\n", strerror(errno));
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return range;
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}
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range.start = mem;
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range.length = stat_buf.st_size;
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return range;
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}
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void unmap_file(struct mem_range_t store)
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{
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if (munmap(store.start, store.length) != 0)
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fprintf(stderr, "Failed to munmap(): %s\n", strerror(errno));
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}
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