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u-boot/arch/blackfin/lib/kgdb.c

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Blackfin: add support for kgdb Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-12-21 21:35:48 +00:00
/*
* 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
}
Make sure that argv[] argument pointers are not modified. 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>
2010-06-28 20:00:46 +00:00
void kgdb_breakpoint(int argc, char * const argv[])
Blackfin: add support for kgdb Signed-off-by: Robin Getz <robin.getz@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2009-12-21 21:35:48 +00:00
{
asm volatile ("excpt 0x1\n");
}
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