mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-15 07:43:07 +00:00
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>
423 lines
8.8 KiB
C
423 lines
8.8 KiB
C
/*
|
|
* U-boot - architecture specific kgdb code
|
|
*
|
|
* Copyright 2009 Analog Devices Inc.
|
|
*
|
|
* Licensed under the GPL-2 or later.
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <command.h>
|
|
|
|
#include <kgdb.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/mach-common/bits/core.h>
|
|
#include "kgdb.h"
|
|
#include <asm/deferred.h>
|
|
#include <asm/traps.h>
|
|
#include <asm/signal.h>
|
|
|
|
void kgdb_enter(struct pt_regs *regs, kgdb_data *kdp)
|
|
{
|
|
/* disable interrupts */
|
|
disable_interrupts();
|
|
|
|
/* reply to host that an exception has occurred */
|
|
kdp->sigval = kgdb_trap(regs);
|
|
|
|
/* send the PC and the Stack Pointer */
|
|
kdp->nregs = 2;
|
|
kdp->regs[0].num = BFIN_PC;
|
|
kdp->regs[0].val = regs->pc;
|
|
|
|
kdp->regs[1].num = BFIN_SP;
|
|
kdp->regs[1].val = (unsigned long)regs;
|
|
|
|
}
|
|
|
|
void kgdb_exit(struct pt_regs *regs, kgdb_data *kdp)
|
|
{
|
|
if (kdp->extype & KGDBEXIT_WITHADDR)
|
|
printf("KGDBEXIT_WITHADDR\n");
|
|
|
|
switch (kdp->extype & KGDBEXIT_TYPEMASK) {
|
|
case KGDBEXIT_KILL:
|
|
printf("KGDBEXIT_KILL:\n");
|
|
break;
|
|
case KGDBEXIT_CONTINUE:
|
|
/* Make sure the supervisor single step bit is clear */
|
|
regs->syscfg &= ~1;
|
|
break;
|
|
case KGDBEXIT_SINGLE:
|
|
/* set the supervisor single step bit */
|
|
regs->syscfg |= 1;
|
|
break;
|
|
default:
|
|
printf("KGDBEXIT : %d\n", kdp->extype);
|
|
}
|
|
|
|
/* enable interrupts */
|
|
enable_interrupts();
|
|
}
|
|
|
|
int kgdb_trap(struct pt_regs *regs)
|
|
{
|
|
/* ipend doesn't get filled in properly */
|
|
switch (regs->seqstat & EXCAUSE) {
|
|
case VEC_EXCPT01:
|
|
return SIGTRAP;
|
|
case VEC_EXCPT03:
|
|
return SIGSEGV;
|
|
case VEC_EXCPT02:
|
|
return SIGTRAP;
|
|
case VEC_EXCPT04 ... VEC_EXCPT15:
|
|
return SIGILL;
|
|
case VEC_STEP:
|
|
return SIGTRAP;
|
|
case VEC_OVFLOW:
|
|
return SIGTRAP;
|
|
case VEC_UNDEF_I:
|
|
return SIGILL;
|
|
case VEC_ILGAL_I:
|
|
return SIGILL;
|
|
case VEC_CPLB_VL:
|
|
return SIGSEGV;
|
|
case VEC_MISALI_D:
|
|
return SIGBUS;
|
|
case VEC_UNCOV:
|
|
return SIGILL;
|
|
case VEC_CPLB_MHIT:
|
|
return SIGSEGV;
|
|
case VEC_MISALI_I:
|
|
return SIGBUS;
|
|
case VEC_CPLB_I_VL:
|
|
return SIGBUS;
|
|
case VEC_CPLB_I_MHIT:
|
|
return SIGSEGV;
|
|
default:
|
|
return SIGBUS;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* getregs - gets the pt_regs, and gives them to kgdb's buffer
|
|
*/
|
|
int kgdb_getregs(struct pt_regs *regs, char *buf, int max)
|
|
{
|
|
unsigned long *gdb_regs = (unsigned long *)buf;
|
|
|
|
if (max < NUMREGBYTES)
|
|
kgdb_error(KGDBERR_NOSPACE);
|
|
|
|
if ((unsigned long)gdb_regs & 3)
|
|
kgdb_error(KGDBERR_ALIGNFAULT);
|
|
|
|
gdb_regs[BFIN_R0] = regs->r0;
|
|
gdb_regs[BFIN_R1] = regs->r1;
|
|
gdb_regs[BFIN_R2] = regs->r2;
|
|
gdb_regs[BFIN_R3] = regs->r3;
|
|
gdb_regs[BFIN_R4] = regs->r4;
|
|
gdb_regs[BFIN_R5] = regs->r5;
|
|
gdb_regs[BFIN_R6] = regs->r6;
|
|
gdb_regs[BFIN_R7] = regs->r7;
|
|
gdb_regs[BFIN_P0] = regs->p0;
|
|
gdb_regs[BFIN_P1] = regs->p1;
|
|
gdb_regs[BFIN_P2] = regs->p2;
|
|
gdb_regs[BFIN_P3] = regs->p3;
|
|
gdb_regs[BFIN_P4] = regs->p4;
|
|
gdb_regs[BFIN_P5] = regs->p5;
|
|
gdb_regs[BFIN_SP] = (unsigned long)regs;
|
|
gdb_regs[BFIN_FP] = regs->fp;
|
|
gdb_regs[BFIN_I0] = regs->i0;
|
|
gdb_regs[BFIN_I1] = regs->i1;
|
|
gdb_regs[BFIN_I2] = regs->i2;
|
|
gdb_regs[BFIN_I3] = regs->i3;
|
|
gdb_regs[BFIN_M0] = regs->m0;
|
|
gdb_regs[BFIN_M1] = regs->m1;
|
|
gdb_regs[BFIN_M2] = regs->m2;
|
|
gdb_regs[BFIN_M3] = regs->m3;
|
|
gdb_regs[BFIN_B0] = regs->b0;
|
|
gdb_regs[BFIN_B1] = regs->b1;
|
|
gdb_regs[BFIN_B2] = regs->b2;
|
|
gdb_regs[BFIN_B3] = regs->b3;
|
|
gdb_regs[BFIN_L0] = regs->l0;
|
|
gdb_regs[BFIN_L1] = regs->l1;
|
|
gdb_regs[BFIN_L2] = regs->l2;
|
|
gdb_regs[BFIN_L3] = regs->l3;
|
|
gdb_regs[BFIN_A0_DOT_X] = regs->a0x;
|
|
gdb_regs[BFIN_A0_DOT_W] = regs->a0w;
|
|
gdb_regs[BFIN_A1_DOT_X] = regs->a1x;
|
|
gdb_regs[BFIN_A1_DOT_W] = regs->a1w;
|
|
gdb_regs[BFIN_ASTAT] = regs->astat;
|
|
gdb_regs[BFIN_RETS] = regs->rets;
|
|
gdb_regs[BFIN_LC0] = regs->lc0;
|
|
gdb_regs[BFIN_LT0] = regs->lt0;
|
|
gdb_regs[BFIN_LB0] = regs->lb0;
|
|
gdb_regs[BFIN_LC1] = regs->lc1;
|
|
gdb_regs[BFIN_LT1] = regs->lt1;
|
|
gdb_regs[BFIN_LB1] = regs->lb1;
|
|
gdb_regs[BFIN_CYCLES] = 0;
|
|
gdb_regs[BFIN_CYCLES2] = 0;
|
|
gdb_regs[BFIN_USP] = regs->usp;
|
|
gdb_regs[BFIN_SEQSTAT] = regs->seqstat;
|
|
gdb_regs[BFIN_SYSCFG] = regs->syscfg;
|
|
gdb_regs[BFIN_RETI] = regs->pc;
|
|
gdb_regs[BFIN_RETX] = regs->retx;
|
|
gdb_regs[BFIN_RETN] = regs->retn;
|
|
gdb_regs[BFIN_RETE] = regs->rete;
|
|
gdb_regs[BFIN_PC] = regs->pc;
|
|
gdb_regs[BFIN_CC] = 0;
|
|
gdb_regs[BFIN_EXTRA1] = 0;
|
|
gdb_regs[BFIN_EXTRA2] = 0;
|
|
gdb_regs[BFIN_EXTRA3] = 0;
|
|
gdb_regs[BFIN_IPEND] = regs->ipend;
|
|
|
|
return NUMREGBYTES;
|
|
}
|
|
|
|
/*
|
|
* putreg - put kgdb's reg (regno) into the pt_regs
|
|
*/
|
|
void kgdb_putreg(struct pt_regs *regs, int regno, char *buf, int length)
|
|
{
|
|
unsigned long *ptr = (unsigned long *)buf;
|
|
|
|
if (regno < 0 || regno > BFIN_NUM_REGS)
|
|
kgdb_error(KGDBERR_BADPARAMS);
|
|
|
|
if (length < 4)
|
|
kgdb_error(KGDBERR_NOSPACE);
|
|
|
|
if ((unsigned long)ptr & 3)
|
|
kgdb_error(KGDBERR_ALIGNFAULT);
|
|
|
|
switch (regno) {
|
|
case BFIN_R0:
|
|
regs->r0 = *ptr;
|
|
break;
|
|
case BFIN_R1:
|
|
regs->r1 = *ptr;
|
|
break;
|
|
case BFIN_R2:
|
|
regs->r2 = *ptr;
|
|
break;
|
|
case BFIN_R3:
|
|
regs->r3 = *ptr;
|
|
break;
|
|
case BFIN_R4:
|
|
regs->r4 = *ptr;
|
|
break;
|
|
case BFIN_R5:
|
|
regs->r5 = *ptr;
|
|
break;
|
|
case BFIN_R6:
|
|
regs->r6 = *ptr;
|
|
break;
|
|
case BFIN_R7:
|
|
regs->r7 = *ptr;
|
|
break;
|
|
case BFIN_P0:
|
|
regs->p0 = *ptr;
|
|
break;
|
|
case BFIN_P1:
|
|
regs->p1 = *ptr;
|
|
break;
|
|
case BFIN_P2:
|
|
regs->p2 = *ptr;
|
|
break;
|
|
case BFIN_P3:
|
|
regs->p3 = *ptr;
|
|
break;
|
|
case BFIN_P4:
|
|
regs->p4 = *ptr;
|
|
break;
|
|
case BFIN_P5:
|
|
regs->p5 = *ptr;
|
|
break;
|
|
case BFIN_SP:
|
|
regs->reserved = *ptr;
|
|
break;
|
|
case BFIN_FP:
|
|
regs->fp = *ptr;
|
|
break;
|
|
case BFIN_I0:
|
|
regs->i0 = *ptr;
|
|
break;
|
|
case BFIN_I1:
|
|
regs->i1 = *ptr;
|
|
break;
|
|
case BFIN_I2:
|
|
regs->i2 = *ptr;
|
|
break;
|
|
case BFIN_I3:
|
|
regs->i3 = *ptr;
|
|
break;
|
|
case BFIN_M0:
|
|
regs->m0 = *ptr;
|
|
break;
|
|
case BFIN_M1:
|
|
regs->m1 = *ptr;
|
|
break;
|
|
case BFIN_M2:
|
|
regs->m2 = *ptr;
|
|
break;
|
|
case BFIN_M3:
|
|
regs->m3 = *ptr;
|
|
break;
|
|
case BFIN_B0:
|
|
regs->b0 = *ptr;
|
|
break;
|
|
case BFIN_B1:
|
|
regs->b1 = *ptr;
|
|
break;
|
|
case BFIN_B2:
|
|
regs->b2 = *ptr;
|
|
break;
|
|
case BFIN_B3:
|
|
regs->b3 = *ptr;
|
|
break;
|
|
case BFIN_L0:
|
|
regs->l0 = *ptr;
|
|
break;
|
|
case BFIN_L1:
|
|
regs->l1 = *ptr;
|
|
break;
|
|
case BFIN_L2:
|
|
regs->l2 = *ptr;
|
|
break;
|
|
case BFIN_L3:
|
|
regs->l3 = *ptr;
|
|
break;
|
|
case BFIN_A0_DOT_X:
|
|
regs->a0x = *ptr;
|
|
break;
|
|
case BFIN_A0_DOT_W:
|
|
regs->a0w = *ptr;
|
|
break;
|
|
case BFIN_A1_DOT_X:
|
|
regs->a1x = *ptr;
|
|
break;
|
|
case BFIN_A1_DOT_W:
|
|
regs->a1w = *ptr;
|
|
break;
|
|
case BFIN_ASTAT:
|
|
regs->astat = *ptr;
|
|
break;
|
|
case BFIN_RETS:
|
|
regs->rets = *ptr;
|
|
break;
|
|
case BFIN_LC0:
|
|
regs->lc0 = *ptr;
|
|
break;
|
|
case BFIN_LT0:
|
|
regs->lt0 = *ptr;
|
|
break;
|
|
case BFIN_LB0:
|
|
regs->lb0 = *ptr;
|
|
break;
|
|
case BFIN_LC1:
|
|
regs->lc1 = *ptr;
|
|
break;
|
|
case BFIN_LT1:
|
|
regs->lt1 = *ptr;
|
|
break;
|
|
case BFIN_LB1:
|
|
regs->lb1 = *ptr;
|
|
break;
|
|
/*
|
|
BFIN_CYCLES,
|
|
BFIN_CYCLES2,
|
|
BFIN_USP,
|
|
BFIN_SEQSTAT,
|
|
BFIN_SYSCFG,
|
|
*/
|
|
case BFIN_RETX:
|
|
regs->retx = *ptr;
|
|
break;
|
|
case BFIN_RETN:
|
|
regs->retn = *ptr;
|
|
break;
|
|
case BFIN_RETE:
|
|
regs->rete = *ptr;
|
|
break;
|
|
case BFIN_PC:
|
|
regs->pc = *ptr;
|
|
break;
|
|
|
|
default:
|
|
kgdb_error(KGDBERR_BADPARAMS);
|
|
}
|
|
}
|
|
|
|
void kgdb_putregs(struct pt_regs *regs, char *buf, int length)
|
|
{
|
|
unsigned long *gdb_regs = (unsigned long *)buf;
|
|
|
|
if (length != BFIN_NUM_REGS)
|
|
kgdb_error(KGDBERR_NOSPACE);
|
|
|
|
if ((unsigned long)gdb_regs & 3)
|
|
kgdb_error(KGDBERR_ALIGNFAULT);
|
|
|
|
regs->r0 = gdb_regs[BFIN_R0];
|
|
regs->r1 = gdb_regs[BFIN_R1];
|
|
regs->r2 = gdb_regs[BFIN_R2];
|
|
regs->r3 = gdb_regs[BFIN_R3];
|
|
regs->r4 = gdb_regs[BFIN_R4];
|
|
regs->r5 = gdb_regs[BFIN_R5];
|
|
regs->r6 = gdb_regs[BFIN_R6];
|
|
regs->r7 = gdb_regs[BFIN_R7];
|
|
regs->p0 = gdb_regs[BFIN_P0];
|
|
regs->p1 = gdb_regs[BFIN_P1];
|
|
regs->p2 = gdb_regs[BFIN_P2];
|
|
regs->p3 = gdb_regs[BFIN_P3];
|
|
regs->p4 = gdb_regs[BFIN_P4];
|
|
regs->p5 = gdb_regs[BFIN_P5];
|
|
regs->fp = gdb_regs[BFIN_FP];
|
|
/* regs->sp = gdb_regs[BFIN_ ]; */
|
|
regs->i0 = gdb_regs[BFIN_I0];
|
|
regs->i1 = gdb_regs[BFIN_I1];
|
|
regs->i2 = gdb_regs[BFIN_I2];
|
|
regs->i3 = gdb_regs[BFIN_I3];
|
|
regs->m0 = gdb_regs[BFIN_M0];
|
|
regs->m1 = gdb_regs[BFIN_M1];
|
|
regs->m2 = gdb_regs[BFIN_M2];
|
|
regs->m3 = gdb_regs[BFIN_M3];
|
|
regs->b0 = gdb_regs[BFIN_B0];
|
|
regs->b1 = gdb_regs[BFIN_B1];
|
|
regs->b2 = gdb_regs[BFIN_B2];
|
|
regs->b3 = gdb_regs[BFIN_B3];
|
|
regs->l0 = gdb_regs[BFIN_L0];
|
|
regs->l1 = gdb_regs[BFIN_L1];
|
|
regs->l2 = gdb_regs[BFIN_L2];
|
|
regs->l3 = gdb_regs[BFIN_L3];
|
|
regs->a0x = gdb_regs[BFIN_A0_DOT_X];
|
|
regs->a0w = gdb_regs[BFIN_A0_DOT_W];
|
|
regs->a1x = gdb_regs[BFIN_A1_DOT_X];
|
|
regs->a1w = gdb_regs[BFIN_A1_DOT_W];
|
|
regs->rets = gdb_regs[BFIN_RETS];
|
|
regs->lc0 = gdb_regs[BFIN_LC0];
|
|
regs->lt0 = gdb_regs[BFIN_LT0];
|
|
regs->lb0 = gdb_regs[BFIN_LB0];
|
|
regs->lc1 = gdb_regs[BFIN_LC1];
|
|
regs->lt1 = gdb_regs[BFIN_LT1];
|
|
regs->lb1 = gdb_regs[BFIN_LB1];
|
|
regs->usp = gdb_regs[BFIN_USP];
|
|
regs->syscfg = gdb_regs[BFIN_SYSCFG];
|
|
regs->retx = gdb_regs[BFIN_PC];
|
|
regs->retn = gdb_regs[BFIN_RETN];
|
|
regs->rete = gdb_regs[BFIN_RETE];
|
|
regs->pc = gdb_regs[BFIN_PC];
|
|
|
|
#if 0 /* can't change these */
|
|
regs->astat = gdb_regs[BFIN_ASTAT];
|
|
regs->seqstat = gdb_regs[BFIN_SEQSTAT];
|
|
regs->ipend = gdb_regs[BFIN_IPEND];
|
|
#endif
|
|
|
|
}
|
|
|
|
void kgdb_breakpoint(int argc, char * const argv[])
|
|
{
|
|
asm volatile ("excpt 0x1\n");
|
|
}
|