260 lines
5.5 KiB
C
260 lines
5.5 KiB
C
#include <common.h>
|
|
#include <command.h>
|
|
#include <kgdb.h>
|
|
#include <asm/signal.h>
|
|
#include <asm/processor.h>
|
|
|
|
#define PC_REGNUM 64
|
|
#define SP_REGNUM 1
|
|
|
|
void breakinst(void);
|
|
|
|
int
|
|
kgdb_setjmp(long *buf)
|
|
{
|
|
unsigned long temp;
|
|
|
|
asm volatile("mflr %0; stw %0,0(%1);"
|
|
"stw %%r1,4(%1); stw %%r2,8(%1);"
|
|
"mfcr %0; stw %0,12(%1);"
|
|
"stmw %%r13,16(%1)"
|
|
: "=&r"(temp) : "r" (buf));
|
|
/* XXX should save fp regs as well */
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
kgdb_longjmp(long *buf, int val)
|
|
{
|
|
unsigned long temp;
|
|
|
|
if (val == 0)
|
|
val = 1;
|
|
|
|
asm volatile("lmw %%r13,16(%1);"
|
|
"lwz %0,12(%1); mtcrf 0x38,%0;"
|
|
"lwz %0,0(%1); lwz %%r1,4(%1); lwz %%r2,8(%1);"
|
|
"mtlr %0; mr %%r3,%2"
|
|
: "=&r"(temp) : "r" (buf), "r" (val));
|
|
}
|
|
|
|
/* Convert the SPARC hardware trap type code to a unix signal number. */
|
|
/*
|
|
* This table contains the mapping between PowerPC hardware trap types, and
|
|
* signals, which are primarily what GDB understands.
|
|
*/
|
|
static struct hard_trap_info
|
|
{
|
|
unsigned int tt; /* Trap type code for powerpc */
|
|
unsigned char signo; /* Signal that we map this trap into */
|
|
} hard_trap_info[] = {
|
|
{ 0x200, SIGSEGV }, /* machine check */
|
|
{ 0x300, SIGSEGV }, /* address error (store) */
|
|
{ 0x400, SIGBUS }, /* instruction bus error */
|
|
{ 0x500, SIGINT }, /* interrupt */
|
|
{ 0x600, SIGBUS }, /* alignment */
|
|
{ 0x700, SIGTRAP }, /* breakpoint trap */
|
|
{ 0x800, SIGFPE }, /* fpu unavail */
|
|
{ 0x900, SIGALRM }, /* decrementer */
|
|
{ 0xa00, SIGILL }, /* reserved */
|
|
{ 0xb00, SIGILL }, /* reserved */
|
|
{ 0xc00, SIGCHLD }, /* syscall */
|
|
{ 0xd00, SIGTRAP }, /* single-step/watch */
|
|
{ 0xe00, SIGFPE }, /* fp assist */
|
|
{ 0, 0} /* Must be last */
|
|
};
|
|
|
|
static int
|
|
computeSignal(unsigned int tt)
|
|
{
|
|
struct hard_trap_info *ht;
|
|
|
|
for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
|
|
if (ht->tt == tt)
|
|
return ht->signo;
|
|
|
|
return SIGHUP; /* default for things we don't know about */
|
|
}
|
|
|
|
void
|
|
kgdb_enter(struct pt_regs *regs, kgdb_data *kdp)
|
|
{
|
|
unsigned long msr;
|
|
|
|
kdp->private[0] = msr = get_msr();
|
|
set_msr(msr & ~MSR_EE); /* disable interrupts */
|
|
|
|
if (regs->nip == (unsigned long)breakinst) {
|
|
/* Skip over breakpoint trap insn */
|
|
regs->nip += 4;
|
|
}
|
|
regs->msr &= ~MSR_SE;
|
|
|
|
/* reply to host that an exception has occurred */
|
|
kdp->sigval = computeSignal(regs->trap);
|
|
|
|
kdp->nregs = 2;
|
|
|
|
kdp->regs[0].num = PC_REGNUM;
|
|
kdp->regs[0].val = regs->nip;
|
|
|
|
kdp->regs[1].num = SP_REGNUM;
|
|
kdp->regs[1].val = regs->gpr[SP_REGNUM];
|
|
}
|
|
|
|
void
|
|
kgdb_exit(struct pt_regs *regs, kgdb_data *kdp)
|
|
{
|
|
unsigned long msr = kdp->private[0];
|
|
|
|
if (kdp->extype & KGDBEXIT_WITHADDR)
|
|
regs->nip = kdp->exaddr;
|
|
|
|
switch (kdp->extype & KGDBEXIT_TYPEMASK) {
|
|
|
|
case KGDBEXIT_KILL:
|
|
case KGDBEXIT_CONTINUE:
|
|
set_msr(msr);
|
|
break;
|
|
|
|
case KGDBEXIT_SINGLE:
|
|
regs->msr |= MSR_SE;
|
|
#if 0
|
|
set_msr(msr | MSR_SE);
|
|
#endif
|
|
break;
|
|
}
|
|
}
|
|
|
|
int
|
|
kgdb_trap(struct pt_regs *regs)
|
|
{
|
|
return (regs->trap);
|
|
}
|
|
|
|
/* return the value of the CPU registers.
|
|
* some of them are non-PowerPC names :(
|
|
* they are stored in gdb like:
|
|
* struct {
|
|
* u32 gpr[32];
|
|
* f64 fpr[32];
|
|
* u32 pc, ps, cnd, lr; (ps=msr)
|
|
* u32 cnt, xer, mq;
|
|
* }
|
|
*/
|
|
|
|
#define SPACE_REQUIRED ((32*4)+(32*8)+(6*4))
|
|
|
|
int
|
|
kgdb_getregs(struct pt_regs *regs, char *buf, int max)
|
|
{
|
|
int i;
|
|
unsigned long *ptr = (unsigned long *)buf;
|
|
|
|
if (max < SPACE_REQUIRED)
|
|
kgdb_error(KGDBERR_NOSPACE);
|
|
|
|
if ((unsigned long)ptr & 3)
|
|
kgdb_error(KGDBERR_ALIGNFAULT);
|
|
|
|
/* General Purpose Regs */
|
|
for (i = 0; i < 32; i++)
|
|
*ptr++ = regs->gpr[i];
|
|
|
|
/* Floating Point Regs */
|
|
for (i = 0; i < 32; i++) {
|
|
*ptr++ = 0;
|
|
*ptr++ = 0;
|
|
}
|
|
|
|
/* pc, msr, cr, lr, ctr, xer, (mq is unused) */
|
|
*ptr++ = regs->nip;
|
|
*ptr++ = regs->msr;
|
|
*ptr++ = regs->ccr;
|
|
*ptr++ = regs->link;
|
|
*ptr++ = regs->ctr;
|
|
*ptr++ = regs->xer;
|
|
|
|
return (SPACE_REQUIRED);
|
|
}
|
|
|
|
/* set the value of the CPU registers */
|
|
void
|
|
kgdb_putreg(struct pt_regs *regs, int regno, char *buf, int length)
|
|
{
|
|
unsigned long *ptr = (unsigned long *)buf;
|
|
|
|
if (regno < 0 || regno >= 70)
|
|
kgdb_error(KGDBERR_BADPARAMS);
|
|
else if (regno >= 32 && regno < 64) {
|
|
if (length < 8)
|
|
kgdb_error(KGDBERR_NOSPACE);
|
|
}
|
|
else {
|
|
if (length < 4)
|
|
kgdb_error(KGDBERR_NOSPACE);
|
|
}
|
|
|
|
if ((unsigned long)ptr & 3)
|
|
kgdb_error(KGDBERR_ALIGNFAULT);
|
|
|
|
if (regno >= 0 && regno < 32)
|
|
regs->gpr[regno] = *ptr;
|
|
else switch (regno) {
|
|
case 64: regs->nip = *ptr; break;
|
|
case 65: regs->msr = *ptr; break;
|
|
case 66: regs->ccr = *ptr; break;
|
|
case 67: regs->link = *ptr; break;
|
|
case 68: regs->ctr = *ptr; break;
|
|
case 69: regs->ctr = *ptr; break;
|
|
|
|
default:
|
|
kgdb_error(KGDBERR_BADPARAMS);
|
|
}
|
|
}
|
|
|
|
void
|
|
kgdb_putregs(struct pt_regs *regs, char *buf, int length)
|
|
{
|
|
int i;
|
|
unsigned long *ptr = (unsigned long *)buf;
|
|
|
|
if (length < SPACE_REQUIRED)
|
|
kgdb_error(KGDBERR_NOSPACE);
|
|
|
|
if ((unsigned long)ptr & 3)
|
|
kgdb_error(KGDBERR_ALIGNFAULT);
|
|
|
|
/*
|
|
* If the stack pointer has moved, you should pray.
|
|
* (cause only god can help you).
|
|
*/
|
|
|
|
/* General Purpose Regs */
|
|
for (i = 0; i < 32; i++)
|
|
regs->gpr[i] = *ptr++;
|
|
|
|
/* Floating Point Regs */
|
|
ptr += 32*2;
|
|
|
|
/* pc, msr, cr, lr, ctr, xer, (mq is unused) */
|
|
regs->nip = *ptr++;
|
|
regs->msr = *ptr++;
|
|
regs->ccr = *ptr++;
|
|
regs->link = *ptr++;
|
|
regs->ctr = *ptr++;
|
|
regs->xer = *ptr++;
|
|
}
|
|
|
|
/* This function will generate a breakpoint exception. It is used at the
|
|
beginning of a program to sync up with a debugger and can be used
|
|
otherwise as a quick means to stop program execution and "break" into
|
|
the debugger. */
|
|
|
|
void
|
|
kgdb_breakpoint(int argc, char * const argv[])
|
|
{
|
|
asm(" .globl breakinst\n\
|
|
breakinst: .long 0x7d821008\n\
|
|
");
|
|
}
|