lib_ppc/kgdb.c - u-boot - Git at Google

 #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\
 	    ");
 }
	#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 ((324)+(328)+(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\
	");
	}