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u-boot-brain/arch/powerpc/lib/kgdb.c
Stefan Roese a47a12becf Move arch/ppc to arch/powerpc 
As discussed on the list, move "arch/ppc" to "arch/powerpc" to
better match the Linux directory structure.

Please note that this patch also changes the "ppc" target in
MAKEALL to "powerpc" to match this new infrastructure. But "ppc"
is kept as an alias for now, to not break compatibility with
scripts using this name.

Signed-off-by: Stefan Roese <sr@denx.de>
Acked-by: Wolfgang Denk <wd@denx.de>
Acked-by: Detlev Zundel <dzu@denx.de>
Acked-by: Kim Phillips <kim.phillips@freescale.com>
Cc: Peter Tyser <ptyser@xes-inc.com>
Cc: Anatolij Gustschin <agust@denx.de>
2010-04-21 23:42:38 +02:00

322 lines
7.4 KiB
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#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)
{
asm ("mflr 0; stw 0,0(%0);"
"stw 1,4(%0); stw 2,8(%0);"
"mfcr 0; stw 0,12(%0);"
"stmw 13,16(%0)"
: : "r" (buf));
/* XXX should save fp regs as well */
return 0;
}
void
kgdb_longjmp(long *buf, int val)
{
if (val == 0)
val = 1;
asm ("lmw 13,16(%0);"
"lwz 0,12(%0); mtcrf 0x38,0;"
"lwz 0,0(%0); lwz 1,4(%0); lwz 2,8(%0);"
"mtlr 0; mr 3,%1"
: : "r" (buf), "r" (val));
}
static inline unsigned long
get_msr(void)
{
unsigned long msr;
asm volatile("mfmsr %0" : "=r" (msr):);
return msr;
}
static inline void
set_msr(unsigned long msr)
{
asm volatile("mtmsr %0" : : "r" (msr));
}
/* 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 }, /* alingment */
{ 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))
#ifdef CONFIG_8260
/* store floating double indexed */
#define STFDI(n,p) __asm__ __volatile__ ("stfd " #n ",%0" : "=o"(p[2*n]))
/* store floating double multiple */
#define STFDM(p) { STFDI( 0,p); STFDI( 1,p); STFDI( 2,p); STFDI( 3,p); \
STFDI( 4,p); STFDI( 5,p); STFDI( 6,p); STFDI( 7,p); \
STFDI( 8,p); STFDI( 9,p); STFDI(10,p); STFDI(11,p); \
STFDI(12,p); STFDI(13,p); STFDI(14,p); STFDI(15,p); \
STFDI(16,p); STFDI(17,p); STFDI(18,p); STFDI(19,p); \
STFDI(20,p); STFDI(21,p); STFDI(22,p); STFDI(23,p); \
STFDI(24,p); STFDI(25,p); STFDI(26,p); STFDI(27,p); \
STFDI(28,p); STFDI(29,p); STFDI(30,p); STFDI(31,p); }
#endif
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 */
#ifdef CONFIG_8260
STFDM(ptr);
ptr += 32*2;
#else
for (i = 0; i < 32; i++) {
*ptr++ = 0;
*ptr++ = 0;
}
#endif
/* 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 */
#ifdef CONFIG_8260
/* load floating double */
#define LFD(n,v) __asm__ __volatile__ ("lfd " #n ",%0" :: "o"(v))
/* load floating double indexed */
#define LFDI(n,p) __asm__ __volatile__ ("lfd " #n ",%0" :: "o"((p)[2*n]))
/* load floating double multiple */
#define LFDM(p) { LFDI( 0,p); LFDI( 1,p); LFDI( 2,p); LFDI( 3,p); \
LFDI( 4,p); LFDI( 5,p); LFDI( 6,p); LFDI( 7,p); \
LFDI( 8,p); LFDI( 9,p); LFDI(10,p); LFDI(11,p); \
LFDI(12,p); LFDI(13,p); LFDI(14,p); LFDI(15,p); \
LFDI(16,p); LFDI(17,p); LFDI(18,p); LFDI(19,p); \
LFDI(20,p); LFDI(21,p); LFDI(22,p); LFDI(23,p); \
LFDI(24,p); LFDI(25,p); LFDI(26,p); LFDI(27,p); \
LFDI(28,p); LFDI(29,p); LFDI(30,p); LFDI(31,p); }
#endif
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) {
#ifdef CONFIG_8260
#define caseF(n) \
case (n) + 32: LFD(n, *ptr); break;
caseF( 0) caseF( 1) caseF( 2) caseF( 3) caseF( 4) caseF( 5) caseF( 6) caseF( 7)
caseF( 8) caseF( 9) caseF(10) caseF(11) caseF(12) caseF(13) caseF(14) caseF(15)
caseF(16) caseF(17) caseF(18) caseF(19) caseF(20) caseF(21) caseF(22) caseF(23)
caseF(24) caseF(25) caseF(26) caseF(27) caseF(28) caseF(29) caseF(30) caseF(31)
#undef caseF
#endif
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 */
#ifdef CONFIG_8260
LFDM(ptr);
#endif
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 *argv[])
{
asm(" .globl breakinst\n\
breakinst: .long 0x7d821008\n\
");
}
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