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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>
298 lines
8.3 KiB
C
298 lines
8.3 KiB
C
/* OpenProm defines mainly taken from linux kernel header files
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*
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* openprom.h: Prom structures and defines for access to the OPENBOOT
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* prom routines and data areas.
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*
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* Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
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* Copyright (C) 2007 Daniel Hellstrom (daniel@gaisler.com)
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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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*/
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#ifndef __SPARC_OPENPROM_H__
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#define __SPARC_OPENPROM_H__
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/* Empirical constants... */
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#define LINUX_OPPROM_MAGIC 0x10010407
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#ifndef __ASSEMBLY__
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/* V0 prom device operations. */
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struct linux_dev_v0_funcs {
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int (*v0_devopen) (char *device_str);
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int (*v0_devclose) (int dev_desc);
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int (*v0_rdblkdev) (int dev_desc, int num_blks, int blk_st, char *buf);
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int (*v0_wrblkdev) (int dev_desc, int num_blks, int blk_st, char *buf);
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int (*v0_wrnetdev) (int dev_desc, int num_bytes, char *buf);
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int (*v0_rdnetdev) (int dev_desc, int num_bytes, char *buf);
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int (*v0_rdchardev) (int dev_desc, int num_bytes, int dummy, char *buf);
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int (*v0_wrchardev) (int dev_desc, int num_bytes, int dummy, char *buf);
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int (*v0_seekdev) (int dev_desc, long logical_offst, int from);
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};
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/* V2 and later prom device operations. */
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struct linux_dev_v2_funcs {
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int (*v2_inst2pkg) (int d); /* Convert ihandle to phandle */
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char *(*v2_dumb_mem_alloc) (char *va, unsigned sz);
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void (*v2_dumb_mem_free) (char *va, unsigned sz);
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/* To map devices into virtual I/O space. */
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char *(*v2_dumb_mmap) (char *virta, int which_io, unsigned paddr,
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unsigned sz);
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void (*v2_dumb_munmap) (char *virta, unsigned size);
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int (*v2_dev_open) (char *devpath);
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void (*v2_dev_close) (int d);
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int (*v2_dev_read) (int d, char *buf, int nbytes);
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int (*v2_dev_write) (int d, char *buf, int nbytes);
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int (*v2_dev_seek) (int d, int hi, int lo);
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/* Never issued (multistage load support) */
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void (*v2_wheee2) (void);
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void (*v2_wheee3) (void);
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};
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struct linux_mlist_v0 {
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struct linux_mlist_v0 *theres_more;
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char *start_adr;
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unsigned num_bytes;
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};
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struct linux_mem_v0 {
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struct linux_mlist_v0 **v0_totphys;
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struct linux_mlist_v0 **v0_prommap;
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struct linux_mlist_v0 **v0_available; /* What we can use */
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};
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/* Arguments sent to the kernel from the boot prompt. */
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struct linux_arguments_v0 {
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char * const argv[8];
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char args[100];
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char boot_dev[2];
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int boot_dev_ctrl;
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int boot_dev_unit;
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int dev_partition;
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char *kernel_file_name;
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void *aieee1; /* XXX */
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};
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/* V2 and up boot things. */
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struct linux_bootargs_v2 {
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char **bootpath;
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char **bootargs;
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int *fd_stdin;
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int *fd_stdout;
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};
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/* The top level PROM vector. */
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struct linux_romvec {
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/* Version numbers. */
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unsigned int pv_magic_cookie;
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unsigned int pv_romvers;
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unsigned int pv_plugin_revision;
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unsigned int pv_printrev;
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/* Version 0 memory descriptors. */
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struct linux_mem_v0 pv_v0mem;
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/* Node operations. */
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struct linux_nodeops *pv_nodeops;
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char **pv_bootstr;
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struct linux_dev_v0_funcs pv_v0devops;
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char *pv_stdin;
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char *pv_stdout;
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#define PROMDEV_KBD 0 /* input from keyboard */
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#define PROMDEV_SCREEN 0 /* output to screen */
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#define PROMDEV_TTYA 1 /* in/out to ttya */
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#define PROMDEV_TTYB 2 /* in/out to ttyb */
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/* Blocking getchar/putchar. NOT REENTRANT! (grr) */
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int (*pv_getchar) (void);
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void (*pv_putchar) (int ch);
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/* Non-blocking variants. */
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int (*pv_nbgetchar) (void);
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int (*pv_nbputchar) (int ch);
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void (*pv_putstr) (char *str, int len);
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/* Miscellany. */
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void (*pv_reboot) (char *bootstr);
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void (*pv_printf) (__const__ char *fmt, ...);
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void (*pv_abort) (void);
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__volatile__ int *pv_ticks;
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void (*pv_halt) (void);
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void (**pv_synchook) (void);
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/* Evaluate a forth string, not different proto for V0 and V2->up. */
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union {
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void (*v0_eval) (int len, char *str);
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void (*v2_eval) (char *str);
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} pv_fortheval;
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struct linux_arguments_v0 **pv_v0bootargs;
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/* Get ether address. */
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unsigned int (*pv_enaddr) (int d, char *enaddr);
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struct linux_bootargs_v2 pv_v2bootargs;
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struct linux_dev_v2_funcs pv_v2devops;
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int filler[15];
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/* This one is sun4c/sun4 only. */
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void (*pv_setctxt) (int ctxt, char *va, int pmeg);
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/* Prom version 3 Multiprocessor routines. This stuff is crazy.
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* No joke. Calling these when there is only one cpu probably
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* crashes the machine, have to test this. :-)
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*/
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/* v3_cpustart() will start the cpu 'whichcpu' in mmu-context
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* 'thiscontext' executing at address 'prog_counter'
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*/
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int (*v3_cpustart) (unsigned int whichcpu, int ctxtbl_ptr,
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int thiscontext, char *prog_counter);
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/* v3_cpustop() will cause cpu 'whichcpu' to stop executing
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* until a resume cpu call is made.
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*/
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int (*v3_cpustop) (unsigned int whichcpu);
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/* v3_cpuidle() will idle cpu 'whichcpu' until a stop or
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* resume cpu call is made.
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*/
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int (*v3_cpuidle) (unsigned int whichcpu);
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/* v3_cpuresume() will resume processor 'whichcpu' executing
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* starting with whatever 'pc' and 'npc' were left at the
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* last 'idle' or 'stop' call.
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*/
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int (*v3_cpuresume) (unsigned int whichcpu);
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};
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/* Routines for traversing the prom device tree. */
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struct linux_nodeops {
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int (*no_nextnode) (int node);
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int (*no_child) (int node);
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int (*no_proplen) (int node, char *name);
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int (*no_getprop) (int node, char *name, char *val);
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int (*no_setprop) (int node, char *name, char *val, int len);
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char *(*no_nextprop) (int node, char *name);
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};
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/* More fun PROM structures for device probing. */
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#define PROMREG_MAX 16
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#define PROMVADDR_MAX 16
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#define PROMINTR_MAX 15
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struct linux_prom_registers {
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unsigned int which_io; /* is this in OBIO space? */
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unsigned int phys_addr; /* The physical address of this register */
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unsigned int reg_size; /* How many bytes does this register take up? */
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};
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struct linux_prom_irqs {
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int pri; /* IRQ priority */
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int vector; /* This is foobar, what does it do? */
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};
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/* Element of the "ranges" vector */
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struct linux_prom_ranges {
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unsigned int ot_child_space;
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unsigned int ot_child_base; /* Bus feels this */
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unsigned int ot_parent_space;
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unsigned int ot_parent_base; /* CPU looks from here */
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unsigned int or_size;
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};
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/* Ranges and reg properties are a bit different for PCI. */
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struct linux_prom_pci_registers {
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/*
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* We don't know what information this field contain.
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* We guess, PCI device function is in bits 15:8
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* So, ...
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*/
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unsigned int which_io; /* Let it be which_io */
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unsigned int phys_hi;
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unsigned int phys_lo;
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unsigned int size_hi;
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unsigned int size_lo;
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};
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struct linux_prom_pci_ranges {
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unsigned int child_phys_hi; /* Only certain bits are encoded here. */
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unsigned int child_phys_mid;
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unsigned int child_phys_lo;
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unsigned int parent_phys_hi;
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unsigned int parent_phys_lo;
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unsigned int size_hi;
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unsigned int size_lo;
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};
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struct linux_prom_pci_assigned_addresses {
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unsigned int which_io;
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unsigned int phys_hi;
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unsigned int phys_lo;
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unsigned int size_hi;
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unsigned int size_lo;
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};
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struct linux_prom_ebus_ranges {
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unsigned int child_phys_hi;
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unsigned int child_phys_lo;
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unsigned int parent_phys_hi;
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unsigned int parent_phys_mid;
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unsigned int parent_phys_lo;
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unsigned int size;
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};
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/* Offset into the EEPROM where the id PROM is located on the 4c */
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#define IDPROM_OFFSET 0x7d8
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/* On sun4m; physical. */
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/* MicroSPARC(-II) does not decode 31rd bit, but it works. */
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#define IDPROM_OFFSET_M 0xfd8
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struct idprom {
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unsigned char id_format; /* Format identifier (always 0x01) */
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unsigned char id_machtype; /* Machine type */
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unsigned char id_ethaddr[6]; /* Hardware ethernet address */
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long id_date; /* Date of manufacture */
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unsigned int id_sernum:24; /* Unique serial number */
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unsigned char id_cksum; /* Checksum - xor of the data bytes */
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unsigned char reserved[16];
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};
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extern struct idprom *idprom;
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extern void idprom_init(void);
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#define IDPROM_SIZE (sizeof(struct idprom))
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#endif /* !(__ASSEMBLY__) */
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#endif
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