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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>
71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
#ifndef __KGDB_H__
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#define __KGDB_H__
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#include <asm/ptrace.h>
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#define KGDBERR_BADPARAMS 1
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#define KGDBERR_NOTHEXDIG 2
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#define KGDBERR_MEMFAULT 3
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#define KGDBERR_NOSPACE 4
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#define KGDBERR_ALIGNFAULT 5
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#define KGDBDATA_MAXREGS 8
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#define KGDBDATA_MAXPRIV 8
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#define KGDBEXIT_TYPEMASK 0xff
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#define KGDBEXIT_KILL 0
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#define KGDBEXIT_CONTINUE 1
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#define KGDBEXIT_SINGLE 2
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#define KGDBEXIT_WITHADDR 0x100
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typedef
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struct {
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int num;
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unsigned long val;
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}
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kgdb_reg;
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typedef
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struct {
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int sigval;
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int extype;
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unsigned long exaddr;
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int nregs;
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kgdb_reg regs[KGDBDATA_MAXREGS];
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unsigned long private[KGDBDATA_MAXPRIV];
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}
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kgdb_data;
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/* these functions are provided by the generic kgdb support */
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extern void kgdb_init(void);
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extern void kgdb_error(int);
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extern int kgdb_output_string(const char *, unsigned int);
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extern void breakpoint(void);
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/* these functions are provided by the platform specific kgdb support */
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extern void kgdb_flush_cache_range(void *, void *);
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extern void kgdb_flush_cache_all(void);
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extern int kgdb_setjmp(long *);
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extern void kgdb_longjmp(long *, int);
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extern void kgdb_enter(struct pt_regs *, kgdb_data *);
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extern void kgdb_exit(struct pt_regs *, kgdb_data *);
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extern int kgdb_getregs(struct pt_regs *, char *, int);
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extern void kgdb_putreg(struct pt_regs *, int, char *, int);
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extern void kgdb_putregs(struct pt_regs *, char *, int);
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extern int kgdb_trap(struct pt_regs *);
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extern void kgdb_breakpoint(int argc, char * const argv[]);
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/* these functions are provided by the platform serial driver */
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extern void kgdb_serial_init(void);
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extern int getDebugChar(void);
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extern void putDebugChar(int);
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extern void putDebugStr(const char *);
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extern void kgdb_interruptible(int);
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/* this is referenced in the trap handler for the platform */
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extern int (*debugger_exception_handler)(struct pt_regs *);
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#endif /* __KGDB_H__ */
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