The hush shell dynamically allocates (and re-allocates) memory for the argument strings in the "char *argv[]" argument vector passed to commands. Any code that modifies these pointers will cause serious corruption of the malloc data structures and crash U-Boot, so make sure the compiler can check that no such modifications are being done by changing the code into "char * const argv[]". This modification is the result of debugging a strange crash caused after adding a new command, which used the following argument processing code which has been working perfectly fine in all Unix systems since version 6 - but not so in U-Boot: int main (int argc, char **argv) { while (--argc > 0 && **++argv == '-') { /* ====> */ while (*++*argv) { switch (**argv) { case 'd': debug++; break; ... default: usage (); } } } ... } The line marked "====>" will corrupt the malloc data structures and usually cause U-Boot to crash when the next command gets executed by the shell. With the modification, the compiler will prevent this with an error: increment of read-only location '*argv' N.B.: The code above can be trivially rewritten like this: while (--argc > 0 && **++argv == '-') { char *arg = *argv; while (*++arg) { switch (*arg) { ... Signed-off-by: Wolfgang Denk <wd@denx.de> Acked-by: Mike Frysinger <vapier@gentoo.org>
195 lines
3.9 KiB
C
195 lines
3.9 KiB
C
/*
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* Command for accessing SPI flash.
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*
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* Copyright (C) 2008 Atmel Corporation
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* Licensed under the GPL-2 or later.
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*/
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#include <common.h>
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#include <spi_flash.h>
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#include <asm/io.h>
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#ifndef CONFIG_SF_DEFAULT_SPEED
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# define CONFIG_SF_DEFAULT_SPEED 1000000
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#endif
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#ifndef CONFIG_SF_DEFAULT_MODE
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# define CONFIG_SF_DEFAULT_MODE SPI_MODE_3
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#endif
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static struct spi_flash *flash;
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static int do_spi_flash_probe(int argc, char * const argv[])
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{
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unsigned int bus = 0;
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unsigned int cs;
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unsigned int speed = CONFIG_SF_DEFAULT_SPEED;
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unsigned int mode = CONFIG_SF_DEFAULT_MODE;
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char *endp;
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struct spi_flash *new;
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if (argc < 2)
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goto usage;
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cs = simple_strtoul(argv[1], &endp, 0);
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if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
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goto usage;
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if (*endp == ':') {
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if (endp[1] == 0)
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goto usage;
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bus = cs;
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cs = simple_strtoul(endp + 1, &endp, 0);
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if (*endp != 0)
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goto usage;
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}
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if (argc >= 3) {
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speed = simple_strtoul(argv[2], &endp, 0);
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if (*argv[2] == 0 || *endp != 0)
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goto usage;
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}
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if (argc >= 4) {
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mode = simple_strtoul(argv[3], &endp, 16);
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if (*argv[3] == 0 || *endp != 0)
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goto usage;
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}
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new = spi_flash_probe(bus, cs, speed, mode);
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if (!new) {
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printf("Failed to initialize SPI flash at %u:%u\n", bus, cs);
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return 1;
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}
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if (flash)
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spi_flash_free(flash);
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flash = new;
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printf("%u KiB %s at %u:%u is now current device\n",
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flash->size >> 10, flash->name, bus, cs);
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return 0;
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usage:
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puts("Usage: sf probe [bus:]cs [hz] [mode]\n");
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return 1;
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}
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static int do_spi_flash_read_write(int argc, char * const argv[])
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{
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unsigned long addr;
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unsigned long offset;
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unsigned long len;
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void *buf;
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char *endp;
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int ret;
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if (argc < 4)
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goto usage;
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addr = simple_strtoul(argv[1], &endp, 16);
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if (*argv[1] == 0 || *endp != 0)
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goto usage;
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offset = simple_strtoul(argv[2], &endp, 16);
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if (*argv[2] == 0 || *endp != 0)
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goto usage;
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len = simple_strtoul(argv[3], &endp, 16);
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if (*argv[3] == 0 || *endp != 0)
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goto usage;
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buf = map_physmem(addr, len, MAP_WRBACK);
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if (!buf) {
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puts("Failed to map physical memory\n");
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return 1;
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}
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if (strcmp(argv[0], "read") == 0)
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ret = spi_flash_read(flash, offset, len, buf);
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else
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ret = spi_flash_write(flash, offset, len, buf);
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unmap_physmem(buf, len);
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if (ret) {
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printf("SPI flash %s failed\n", argv[0]);
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return 1;
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}
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return 0;
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usage:
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printf("Usage: sf %s addr offset len\n", argv[0]);
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return 1;
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}
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static int do_spi_flash_erase(int argc, char * const argv[])
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{
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unsigned long offset;
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unsigned long len;
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char *endp;
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int ret;
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if (argc < 3)
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goto usage;
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offset = simple_strtoul(argv[1], &endp, 16);
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if (*argv[1] == 0 || *endp != 0)
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goto usage;
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len = simple_strtoul(argv[2], &endp, 16);
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if (*argv[2] == 0 || *endp != 0)
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goto usage;
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ret = spi_flash_erase(flash, offset, len);
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if (ret) {
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printf("SPI flash %s failed\n", argv[0]);
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return 1;
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}
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return 0;
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usage:
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puts("Usage: sf erase offset len\n");
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return 1;
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}
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static int do_spi_flash(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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const char *cmd;
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/* need at least two arguments */
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if (argc < 2)
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goto usage;
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cmd = argv[1];
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if (strcmp(cmd, "probe") == 0)
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return do_spi_flash_probe(argc - 1, argv + 1);
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/* The remaining commands require a selected device */
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if (!flash) {
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puts("No SPI flash selected. Please run `sf probe'\n");
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return 1;
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}
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if (strcmp(cmd, "read") == 0 || strcmp(cmd, "write") == 0)
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return do_spi_flash_read_write(argc - 1, argv + 1);
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if (strcmp(cmd, "erase") == 0)
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return do_spi_flash_erase(argc - 1, argv + 1);
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usage:
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cmd_usage(cmdtp);
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return 1;
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}
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U_BOOT_CMD(
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sf, 5, 1, do_spi_flash,
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"SPI flash sub-system",
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"probe [bus:]cs [hz] [mode] - init flash device on given SPI bus\n"
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" and chip select\n"
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"sf read addr offset len - read `len' bytes starting at\n"
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" `offset' to memory at `addr'\n"
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"sf write addr offset len - write `len' bytes from memory\n"
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" at `addr' to flash at `offset'\n"
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"sf erase offset len - erase `len' bytes from `offset'"
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);
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