mirror of
https://github.com/AsahiLinux/u-boot
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54841ab50c
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>
189 lines
5.5 KiB
C
189 lines
5.5 KiB
C
/* SPARC code for booting linux 2.6
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*
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* (C) Copyright 2007
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* Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <command.h>
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#include <asm/byteorder.h>
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#include <asm/prom.h>
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#include <asm/cache.h>
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#include <image.h>
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#define PRINT_KERNEL_HEADER
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extern image_header_t header;
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extern void srmmu_init_cpu(unsigned int entry);
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extern void prepare_bootargs(char *bootargs);
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#ifdef CONFIG_USB_UHCI
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extern int usb_lowlevel_stop(void);
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#endif
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/* sparc kernel argument (the ROM vector) */
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struct linux_romvec *kernel_arg_promvec;
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/* page szie is 4k */
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#define PAGE_SIZE 0x1000
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#define RAMDISK_IMAGE_START_MASK 0x07FF
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#define RAMDISK_PROMPT_FLAG 0x8000
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#define RAMDISK_LOAD_FLAG 0x4000
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struct __attribute__ ((packed)) {
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char traptable[PAGE_SIZE];
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char swapper_pg_dir[PAGE_SIZE];
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char pg0[PAGE_SIZE];
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char pg1[PAGE_SIZE];
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char pg2[PAGE_SIZE];
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char pg3[PAGE_SIZE];
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char empty_bad_page[PAGE_SIZE];
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char empty_bad_page_table[PAGE_SIZE];
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char empty_zero_page[PAGE_SIZE];
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unsigned char hdr[4]; /* ascii "HdrS" */
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/* 00.02.06.0b is for Linux kernel 2.6.11 */
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unsigned char linuxver_mega_major;
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unsigned char linuxver_major;
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unsigned char linuxver_minor;
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unsigned char linuxver_revision;
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/* header version 0x0203 */
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unsigned short hdr_ver;
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union __attribute__ ((packed)) {
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struct __attribute__ ((packed)) {
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unsigned short root_flags;
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unsigned short root_dev;
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unsigned short ram_flags;
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unsigned int sparc_ramdisk_image;
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unsigned int sparc_ramdisk_size;
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unsigned int reboot_command;
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unsigned int resv[3];
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unsigned int end;
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} ver_0203;
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} hdr_input;
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} *linux_hdr;
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/* temporary initrd image holder */
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image_header_t ihdr;
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void arch_lmb_reserve(struct lmb *lmb)
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{
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/* Reserve the space used by PROM and stack. This is done
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* to avoid that the RAM image is copied over stack or
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* PROM.
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*/
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lmb_reserve(lmb, CONFIG_SYS_RELOC_MONITOR_BASE, CONFIG_SYS_RAM_END);
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}
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/* boot the linux kernel */
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int do_bootm_linux(int flag, int argc, char * const argv[], bootm_headers_t * images)
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{
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char *bootargs;
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ulong initrd_start, initrd_end;
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ulong rd_len;
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unsigned int data, len, checksum;
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unsigned int initrd_addr, kernend;
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void (*kernel) (struct linux_romvec *, void *);
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struct lmb *lmb = &images->lmb;
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int ret;
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if ((flag != 0) && (flag != BOOTM_STATE_OS_GO))
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return 1;
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/* Get virtual address of kernel start */
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linux_hdr = (void *)images->os.load;
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/* */
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kernel = (void (*)(struct linux_romvec *, void *))images->ep;
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/* check for a SPARC kernel */
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if ((linux_hdr->hdr[0] != 'H') ||
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(linux_hdr->hdr[1] != 'd') ||
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(linux_hdr->hdr[2] != 'r') || (linux_hdr->hdr[3] != 'S')) {
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puts("Error reading header of SPARC Linux kernel, aborting\n");
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goto error;
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}
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#ifdef PRINT_KERNEL_HEADER
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printf("## Found SPARC Linux kernel %d.%d.%d ...\n",
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linux_hdr->linuxver_major,
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linux_hdr->linuxver_minor, linux_hdr->linuxver_revision);
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#endif
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#ifdef CONFIG_USB_UHCI
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usb_lowlevel_stop();
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#endif
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/* set basic boot params in kernel header now that it has been
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* extracted and is writeable.
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*/
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/* Calc length of RAM disk, if zero no ramdisk available */
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rd_len = images->rd_end - images->rd_start;
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if (rd_len) {
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ret = boot_ramdisk_high(lmb, images->rd_start, rd_len,
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&initrd_start, &initrd_end);
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if (ret) {
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puts("### Failed to relocate RAM disk\n");
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goto error;
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}
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/* Update SPARC kernel header so that Linux knows
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* what is going on and where to find RAM disk.
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*
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* Set INITRD Image address relative to RAM Start
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*/
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linux_hdr->hdr_input.ver_0203.sparc_ramdisk_image =
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initrd_start - CONFIG_SYS_RAM_BASE;
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linux_hdr->hdr_input.ver_0203.sparc_ramdisk_size = rd_len;
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/* Clear READ ONLY flag if set to non-zero */
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linux_hdr->hdr_input.ver_0203.root_flags = 1;
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/* Set root device to: Root_RAM0 */
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linux_hdr->hdr_input.ver_0203.root_dev = 0x100;
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linux_hdr->hdr_input.ver_0203.ram_flags = 0;
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} else {
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/* NOT using RAMDISK image, overwriting kernel defaults */
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linux_hdr->hdr_input.ver_0203.sparc_ramdisk_image = 0;
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linux_hdr->hdr_input.ver_0203.sparc_ramdisk_size = 0;
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/* Leave to kernel defaults
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linux_hdr->hdr_input.ver_0203.root_flags = 1;
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linux_hdr->hdr_input.ver_0203.root_dev = 0;
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linux_hdr->hdr_input.ver_0203.ram_flags = 0;
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*/
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}
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/* Copy bootargs from bootargs variable to kernel readable area */
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bootargs = getenv("bootargs");
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prepare_bootargs(bootargs);
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/* turn on mmu & setup context table & page table for process 0 (kernel) */
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srmmu_init_cpu((unsigned int)kernel);
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/* Enter SPARC Linux kernel
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* From now on the only code in u-boot that will be
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* executed is the PROM code.
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*/
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kernel(kernel_arg_promvec, (void *)images->ep);
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/* It will never come to this... */
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while (1) ;
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error:
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return 1;
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}
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