arch/powerpc/kernel/kgdb.c - SHIFTPHONES/mainline/linux - Gitiles

 /*
  * PowerPC backend to the KGDB stub.
  *
  * 1998 (c) Michael AK Tesch (tesch@cs.wisc.edu)
  * Copyright (C) 2003 Timesys Corporation.
  * Copyright (C) 2004-2006 MontaVista Software, Inc.
  * PPC64 Mods (C) 2005 Frank Rowand (frowand@mvista.com)
  * PPC32 support restored by Vitaly Wool <vwool@ru.mvista.com> and
  * Sergei Shtylyov <sshtylyov@ru.mvista.com>
  * Copyright (C) 2007-2008 Wind River Systems, Inc.
  *
  * This file is licensed under the terms of the GNU General Public License
  * version 2. This program as licensed "as is" without any warranty of any
  * kind, whether express or implied.
  */

 #include <linux/kernel.h>
 #include <linux/kgdb.h>
 #include <linux/smp.h>
 #include <linux/signal.h>
 #include <linux/ptrace.h>
 #include <linux/kdebug.h>
 #include <asm/current.h>
 #include <asm/processor.h>
 #include <asm/machdep.h>
 #include <asm/debug.h>
 #include <asm/code-patching.h>
 #include <linux/slab.h>
 #include <asm/inst.h>

 /*
  * This table contains the mapping between PowerPC hardware trap types, and
  * signals, which are primarily what GDB understands.  GDB and the kernel
  * don't always agree on values, so we use constants taken from gdb-6.2.
  */
 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[] = {
 	{ 0x0100, 0x02 /* SIGINT */  },		/* system reset */
 	{ 0x0200, 0x0b /* SIGSEGV */ },		/* machine check */
 	{ 0x0300, 0x0b /* SIGSEGV */ },		/* data access */
 	{ 0x0400, 0x0b /* SIGSEGV */ },		/* instruction access */
 	{ 0x0500, 0x02 /* SIGINT */  },		/* external interrupt */
 	{ 0x0600, 0x0a /* SIGBUS */  },		/* alignment */
 	{ 0x0700, 0x05 /* SIGTRAP */ },		/* program check */
 	{ 0x0800, 0x08 /* SIGFPE */  },		/* fp unavailable */
 	{ 0x0900, 0x0e /* SIGALRM */ },		/* decrementer */
 	{ 0x0c00, 0x14 /* SIGCHLD */ },		/* system call */
 #ifdef CONFIG_BOOKE_OR_40x
 	{ 0x2002, 0x05 /* SIGTRAP */ },		/* debug */
 #if defined(CONFIG_FSL_BOOKE)
 	{ 0x2010, 0x08 /* SIGFPE */  },		/* spe unavailable */
 	{ 0x2020, 0x08 /* SIGFPE */  },		/* spe unavailable */
 	{ 0x2030, 0x08 /* SIGFPE */  },		/* spe fp data */
 	{ 0x2040, 0x08 /* SIGFPE */  },		/* spe fp data */
 	{ 0x2050, 0x08 /* SIGFPE */  },		/* spe fp round */
 	{ 0x2060, 0x0e /* SIGILL */  },		/* performance monitor */
 	{ 0x2900, 0x08 /* SIGFPE */  },		/* apu unavailable */
 	{ 0x3100, 0x0e /* SIGALRM */ },		/* fixed interval timer */
 	{ 0x3200, 0x02 /* SIGINT */  }, 	/* watchdog */
 #else /* ! CONFIG_FSL_BOOKE */
 	{ 0x1000, 0x0e /* SIGALRM */ },		/* prog interval timer */
 	{ 0x1010, 0x0e /* SIGALRM */ },		/* fixed interval timer */
 	{ 0x1020, 0x02 /* SIGINT */  }, 	/* watchdog */
 	{ 0x2010, 0x08 /* SIGFPE */  },		/* fp unavailable */
 	{ 0x2020, 0x08 /* SIGFPE */  },		/* ap unavailable */
 #endif
 #else /* !CONFIG_BOOKE_OR_40x */
 	{ 0x0d00, 0x05 /* SIGTRAP */ },		/* single-step */
 #if defined(CONFIG_PPC_8xx)
 	{ 0x1000, 0x04 /* SIGILL */  },		/* software emulation */
 #else /* ! CONFIG_PPC_8xx */
 	{ 0x0f00, 0x04 /* SIGILL */  },		/* performance monitor */
 	{ 0x0f20, 0x08 /* SIGFPE */  },		/* altivec unavailable */
 	{ 0x1300, 0x05 /* SIGTRAP */ }, 	/* instruction address break */
 #if defined(CONFIG_PPC64)
 	{ 0x1200, 0x05 /* SIGILL */  },		/* system error */
 	{ 0x1500, 0x04 /* SIGILL */  },		/* soft patch */
 	{ 0x1600, 0x04 /* SIGILL */  },		/* maintenance */
 	{ 0x1700, 0x08 /* SIGFPE */  },		/* altivec assist */
 	{ 0x1800, 0x04 /* SIGILL */  },		/* thermal */
 #else /* ! CONFIG_PPC64 */
 	{ 0x1400, 0x02 /* SIGINT */  },		/* SMI */
 	{ 0x1600, 0x08 /* SIGFPE */  },		/* altivec assist */
 	{ 0x1700, 0x04 /* SIGILL */  },		/* TAU */
 	{ 0x2000, 0x05 /* SIGTRAP */ },		/* run mode */
 #endif
 #endif
 #endif
 	{ 0x0000, 0x00 }			/* 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 */
 }

 /**
  *
  *	kgdb_skipexception - Bail out of KGDB when we've been triggered.
  *	@exception: Exception vector number
  *	@regs: Current &struct pt_regs.
  *
  *	On some architectures we need to skip a breakpoint exception when
  *	it occurs after a breakpoint has been removed.
  *
  */
 int kgdb_skipexception(int exception, struct pt_regs *regs)
 {
 	return kgdb_isremovedbreak(regs->nip);
 }

 static int kgdb_debugger_ipi(struct pt_regs *regs)
 {
 	kgdb_nmicallback(raw_smp_processor_id(), regs);
 	return 0;
 }

 #ifdef CONFIG_SMP
 void kgdb_roundup_cpus(void)
 {
 	smp_send_debugger_break();
 }
 #endif

 /* KGDB functions to use existing PowerPC64 hooks. */
 static int kgdb_debugger(struct pt_regs *regs)
 {
 	return !kgdb_handle_exception(1, computeSignal(TRAP(regs)),
 				      DIE_OOPS, regs);
 }

 static int kgdb_handle_breakpoint(struct pt_regs *regs)
 {
 	if (user_mode(regs))
 		return 0;

 	if (kgdb_handle_exception(1, SIGTRAP, 0, regs) != 0)
 		return 0;

 	if (*(u32 *)regs->nip == BREAK_INSTR)
 		regs_add_return_ip(regs, BREAK_INSTR_SIZE);

 	return 1;
 }

 static int kgdb_singlestep(struct pt_regs *regs)
 {
 	if (user_mode(regs))
 		return 0;

 	kgdb_handle_exception(0, SIGTRAP, 0, regs);

 	return 1;
 }

 static int kgdb_iabr_match(struct pt_regs *regs)
 {
 	if (user_mode(regs))
 		return 0;

 	if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0)
 		return 0;
 	return 1;
 }

 static int kgdb_break_match(struct pt_regs *regs)
 {
 	if (user_mode(regs))
 		return 0;

 	if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0)
 		return 0;
 	return 1;
 }

 #define PACK64(ptr, src) do { *(ptr++) = (src); } while (0)

 #define PACK32(ptr, src) do {          \
 	u32 *ptr32;                   \
 	ptr32 = (u32 *)ptr;           \
 	*(ptr32++) = (src);           \
 	ptr = (unsigned long *)ptr32; \
 	} while (0)

 void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p)
 {
 	struct pt_regs *regs = (struct pt_regs *)(p->thread.ksp +
 						  STACK_FRAME_OVERHEAD);
 	unsigned long *ptr = gdb_regs;
 	int reg;

 	memset(gdb_regs, 0, NUMREGBYTES);

 	/* Regs GPR0-2 */
 	for (reg = 0; reg < 3; reg++)
 		PACK64(ptr, regs->gpr[reg]);

 	/* Regs GPR3-13 are caller saved, not in regs->gpr[] */
 	ptr += 11;

 	/* Regs GPR14-31 */
 	for (reg = 14; reg < 32; reg++)
 		PACK64(ptr, regs->gpr[reg]);

 #ifdef CONFIG_FSL_BOOKE
 #ifdef CONFIG_SPE
 	for (reg = 0; reg < 32; reg++)
 		PACK64(ptr, p->thread.evr[reg]);
 #else
 	ptr += 32;
 #endif
 #else
 	/* fp registers not used by kernel, leave zero */
 	ptr += 32 * 8 / sizeof(long);
 #endif

 	PACK64(ptr, regs->nip);
 	PACK64(ptr, regs->msr);
 	PACK32(ptr, regs->ccr);
 	PACK64(ptr, regs->link);
 	PACK64(ptr, regs->ctr);
 	PACK32(ptr, regs->xer);

 	BUG_ON((unsigned long)ptr >
 	       (unsigned long)(((void *)gdb_regs) + NUMREGBYTES));
 }

 #define GDB_SIZEOF_REG sizeof(unsigned long)
 #define GDB_SIZEOF_REG_U32 sizeof(u32)

 #ifdef CONFIG_FSL_BOOKE
 #define GDB_SIZEOF_FLOAT_REG sizeof(unsigned long)
 #else
 #define GDB_SIZEOF_FLOAT_REG sizeof(u64)
 #endif

 struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
 {
 	{ "r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[0]) },
 	{ "r1", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[1]) },
 	{ "r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[2]) },
 	{ "r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[3]) },
 	{ "r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[4]) },
 	{ "r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[5]) },
 	{ "r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[6]) },
 	{ "r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[7]) },
 	{ "r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[8]) },
 	{ "r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[9]) },
 	{ "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[10]) },
 	{ "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[11]) },
 	{ "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[12]) },
 	{ "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[13]) },
 	{ "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[14]) },
 	{ "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[15]) },
 	{ "r16", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[16]) },
 	{ "r17", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[17]) },
 	{ "r18", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[18]) },
 	{ "r19", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[19]) },
 	{ "r20", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[20]) },
 	{ "r21", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[21]) },
 	{ "r22", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[22]) },
 	{ "r23", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[23]) },
 	{ "r24", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[24]) },
 	{ "r25", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[25]) },
 	{ "r26", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[26]) },
 	{ "r27", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[27]) },
 	{ "r28", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[28]) },
 	{ "r29", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[29]) },
 	{ "r30", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[30]) },
 	{ "r31", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[31]) },

 	{ "f0", GDB_SIZEOF_FLOAT_REG, 0 },
 	{ "f1", GDB_SIZEOF_FLOAT_REG, 1 },
 	{ "f2", GDB_SIZEOF_FLOAT_REG, 2 },
 	{ "f3", GDB_SIZEOF_FLOAT_REG, 3 },
 	{ "f4", GDB_SIZEOF_FLOAT_REG, 4 },
 	{ "f5", GDB_SIZEOF_FLOAT_REG, 5 },
 	{ "f6", GDB_SIZEOF_FLOAT_REG, 6 },
 	{ "f7", GDB_SIZEOF_FLOAT_REG, 7 },
 	{ "f8", GDB_SIZEOF_FLOAT_REG, 8 },
 	{ "f9", GDB_SIZEOF_FLOAT_REG, 9 },
 	{ "f10", GDB_SIZEOF_FLOAT_REG, 10 },
 	{ "f11", GDB_SIZEOF_FLOAT_REG, 11 },
 	{ "f12", GDB_SIZEOF_FLOAT_REG, 12 },
 	{ "f13", GDB_SIZEOF_FLOAT_REG, 13 },
 	{ "f14", GDB_SIZEOF_FLOAT_REG, 14 },
 	{ "f15", GDB_SIZEOF_FLOAT_REG, 15 },
 	{ "f16", GDB_SIZEOF_FLOAT_REG, 16 },
 	{ "f17", GDB_SIZEOF_FLOAT_REG, 17 },
 	{ "f18", GDB_SIZEOF_FLOAT_REG, 18 },
 	{ "f19", GDB_SIZEOF_FLOAT_REG, 19 },
 	{ "f20", GDB_SIZEOF_FLOAT_REG, 20 },
 	{ "f21", GDB_SIZEOF_FLOAT_REG, 21 },
 	{ "f22", GDB_SIZEOF_FLOAT_REG, 22 },
 	{ "f23", GDB_SIZEOF_FLOAT_REG, 23 },
 	{ "f24", GDB_SIZEOF_FLOAT_REG, 24 },
 	{ "f25", GDB_SIZEOF_FLOAT_REG, 25 },
 	{ "f26", GDB_SIZEOF_FLOAT_REG, 26 },
 	{ "f27", GDB_SIZEOF_FLOAT_REG, 27 },
 	{ "f28", GDB_SIZEOF_FLOAT_REG, 28 },
 	{ "f29", GDB_SIZEOF_FLOAT_REG, 29 },
 	{ "f30", GDB_SIZEOF_FLOAT_REG, 30 },
 	{ "f31", GDB_SIZEOF_FLOAT_REG, 31 },

 	{ "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, nip) },
 	{ "msr", GDB_SIZEOF_REG, offsetof(struct pt_regs, msr) },
 	{ "cr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ccr) },
 	{ "lr", GDB_SIZEOF_REG, offsetof(struct pt_regs, link) },
 	{ "ctr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ctr) },
 	{ "xer", GDB_SIZEOF_REG, offsetof(struct pt_regs, xer) },
 };

 char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs)
 {
 	if (regno >= DBG_MAX_REG_NUM || regno < 0)
 		return NULL;

 	if (regno < 32 || regno >= 64)
 		/* First 0 -> 31 gpr registers*/
 		/* pc, msr, ls... registers 64 -> 69 */
 		memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
 				dbg_reg_def[regno].size);

 	if (regno >= 32 && regno < 64) {
 		/* FP registers 32 -> 63 */
 #if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
 		if (current)
 			memcpy(mem, &current->thread.evr[regno-32],
 					dbg_reg_def[regno].size);
 #else
 		/* fp registers not used by kernel, leave zero */
 		memset(mem, 0, dbg_reg_def[regno].size);
 #endif
 	}

 	return dbg_reg_def[regno].name;
 }

 int dbg_set_reg(int regno, void *mem, struct pt_regs *regs)
 {
 	if (regno >= DBG_MAX_REG_NUM || regno < 0)
 		return -EINVAL;

 	if (regno < 32 || regno >= 64)
 		/* First 0 -> 31 gpr registers*/
 		/* pc, msr, ls... registers 64 -> 69 */
 		memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
 				dbg_reg_def[regno].size);

 	if (regno >= 32 && regno < 64) {
 		/* FP registers 32 -> 63 */
 #if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
 		memcpy(&current->thread.evr[regno-32], mem,
 				dbg_reg_def[regno].size);
 #else
 		/* fp registers not used by kernel, leave zero */
 		return 0;
 #endif
 	}

 	return 0;
 }

 void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
 {
 	regs_set_return_ip(regs, pc);
 }

 /*
  * This function does PowerPC specific processing for interfacing to gdb.
  */
 int kgdb_arch_handle_exception(int vector, int signo, int err_code,
 			       char *remcom_in_buffer, char *remcom_out_buffer,
 			       struct pt_regs *linux_regs)
 {
 	char *ptr = &remcom_in_buffer[1];
 	unsigned long addr;

 	switch (remcom_in_buffer[0]) {
 		/*
 		 * sAA..AA   Step one instruction from AA..AA
 		 * This will return an error to gdb ..
 		 */
 	case 's':
 	case 'c':
 		/* handle the optional parameter */
 		if (kgdb_hex2long(&ptr, &addr))
 			regs_set_return_ip(linux_regs, addr);

 		atomic_set(&kgdb_cpu_doing_single_step, -1);
 		/* set the trace bit if we're stepping */
 		if (remcom_in_buffer[0] == 's') {
 #ifdef CONFIG_PPC_ADV_DEBUG_REGS
 			mtspr(SPRN_DBCR0,
 			      mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM);
 			regs_set_return_msr(linux_regs, linux_regs->msr | MSR_DE);
 #else
 			regs_set_return_msr(linux_regs, linux_regs->msr | MSR_SE);
 #endif
 			atomic_set(&kgdb_cpu_doing_single_step,
 				   raw_smp_processor_id());
 		}
 		return 0;
 	}

 	return -1;
 }

 int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
 {
 	u32 instr, *addr = (u32 *)bpt->bpt_addr;
 	int err;

 	err = get_kernel_nofault(instr, addr);
 	if (err)
 		return err;

 	err = patch_instruction(addr, ppc_inst(BREAK_INSTR));
 	if (err)
 		return -EFAULT;

 	*(u32 *)bpt->saved_instr = instr;

 	return 0;
 }

 int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt)
 {
 	int err;
 	unsigned int instr = *(unsigned int *)bpt->saved_instr;
 	u32 *addr = (u32 *)bpt->bpt_addr;

 	err = patch_instruction(addr, ppc_inst(instr));
 	if (err)
 		return -EFAULT;

 	return 0;
 }

 /*
  * Global data
  */
 const struct kgdb_arch arch_kgdb_ops;

 static int kgdb_not_implemented(struct pt_regs *regs)
 {
 	return 0;
 }

 static void *old__debugger_ipi;
 static void *old__debugger;
 static void *old__debugger_bpt;
 static void *old__debugger_sstep;
 static void *old__debugger_iabr_match;
 static void *old__debugger_break_match;
 static void *old__debugger_fault_handler;

 int kgdb_arch_init(void)
 {
 	old__debugger_ipi = __debugger_ipi;
 	old__debugger = __debugger;
 	old__debugger_bpt = __debugger_bpt;
 	old__debugger_sstep = __debugger_sstep;
 	old__debugger_iabr_match = __debugger_iabr_match;
 	old__debugger_break_match = __debugger_break_match;
 	old__debugger_fault_handler = __debugger_fault_handler;

 	__debugger_ipi = kgdb_debugger_ipi;
 	__debugger = kgdb_debugger;
 	__debugger_bpt = kgdb_handle_breakpoint;
 	__debugger_sstep = kgdb_singlestep;
 	__debugger_iabr_match = kgdb_iabr_match;
 	__debugger_break_match = kgdb_break_match;
 	__debugger_fault_handler = kgdb_not_implemented;

 	return 0;
 }

 void kgdb_arch_exit(void)
 {
 	__debugger_ipi = old__debugger_ipi;
 	__debugger = old__debugger;
 	__debugger_bpt = old__debugger_bpt;
 	__debugger_sstep = old__debugger_sstep;
 	__debugger_iabr_match = old__debugger_iabr_match;
 	__debugger_break_match = old__debugger_break_match;
 	__debugger_fault_handler = old__debugger_fault_handler;
 }
	/*
	* PowerPC backend to the KGDB stub.
	*
	* 1998 (c) Michael AK Tesch (tesch@cs.wisc.edu)
	* Copyright (C) 2003 Timesys Corporation.
	* Copyright (C) 2004-2006 MontaVista Software, Inc.
	* PPC64 Mods (C) 2005 Frank Rowand (frowand@mvista.com)
	* PPC32 support restored by Vitaly Wool <vwool@ru.mvista.com> and
	* Sergei Shtylyov <sshtylyov@ru.mvista.com>
	* Copyright (C) 2007-2008 Wind River Systems, Inc.
	*
	* This file is licensed under the terms of the GNU General Public License
	* version 2. This program as licensed "as is" without any warranty of any
	* kind, whether express or implied.
	*/

	#include <linux/kernel.h>
	#include <linux/kgdb.h>
	#include <linux/smp.h>
	#include <linux/signal.h>
	#include <linux/ptrace.h>
	#include <linux/kdebug.h>
	#include <asm/current.h>
	#include <asm/processor.h>
	#include <asm/machdep.h>
	#include <asm/debug.h>
	#include <asm/code-patching.h>
	#include <linux/slab.h>
	#include <asm/inst.h>

	/*
	* This table contains the mapping between PowerPC hardware trap types, and
	* signals, which are primarily what GDB understands. GDB and the kernel
	* don't always agree on values, so we use constants taken from gdb-6.2.
	*/
	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[] = {
	{ 0x0100, 0x02 /* SIGINT / }, / system reset */
	{ 0x0200, 0x0b /* SIGSEGV / }, / machine check */
	{ 0x0300, 0x0b /* SIGSEGV / }, / data access */
	{ 0x0400, 0x0b /* SIGSEGV / }, / instruction access */
	{ 0x0500, 0x02 /* SIGINT / }, / external interrupt */
	{ 0x0600, 0x0a /* SIGBUS / }, / alignment */
	{ 0x0700, 0x05 /* SIGTRAP / }, / program check */
	{ 0x0800, 0x08 /* SIGFPE / }, / fp unavailable */
	{ 0x0900, 0x0e /* SIGALRM / }, / decrementer */
	{ 0x0c00, 0x14 /* SIGCHLD / }, / system call */
	#ifdef CONFIG_BOOKE_OR_40x
	{ 0x2002, 0x05 /* SIGTRAP / }, / debug */
	#if defined(CONFIG_FSL_BOOKE)
	{ 0x2010, 0x08 /* SIGFPE / }, / spe unavailable */
	{ 0x2020, 0x08 /* SIGFPE / }, / spe unavailable */
	{ 0x2030, 0x08 /* SIGFPE / }, / spe fp data */
	{ 0x2040, 0x08 /* SIGFPE / }, / spe fp data */
	{ 0x2050, 0x08 /* SIGFPE / }, / spe fp round */
	{ 0x2060, 0x0e /* SIGILL / }, / performance monitor */
	{ 0x2900, 0x08 /* SIGFPE / }, / apu unavailable */
	{ 0x3100, 0x0e /* SIGALRM / }, / fixed interval timer */
	{ 0x3200, 0x02 /* SIGINT / }, / watchdog */
	#else /* ! CONFIG_FSL_BOOKE */
	{ 0x1000, 0x0e /* SIGALRM / }, / prog interval timer */
	{ 0x1010, 0x0e /* SIGALRM / }, / fixed interval timer */
	{ 0x1020, 0x02 /* SIGINT / }, / watchdog */
	{ 0x2010, 0x08 /* SIGFPE / }, / fp unavailable */
	{ 0x2020, 0x08 /* SIGFPE / }, / ap unavailable */
	#endif
	#else /* !CONFIG_BOOKE_OR_40x */
	{ 0x0d00, 0x05 /* SIGTRAP / }, / single-step */
	#if defined(CONFIG_PPC_8xx)
	{ 0x1000, 0x04 /* SIGILL / }, / software emulation */
	#else /* ! CONFIG_PPC_8xx */
	{ 0x0f00, 0x04 /* SIGILL / }, / performance monitor */
	{ 0x0f20, 0x08 /* SIGFPE / }, / altivec unavailable */
	{ 0x1300, 0x05 /* SIGTRAP / }, / instruction address break */
	#if defined(CONFIG_PPC64)
	{ 0x1200, 0x05 /* SIGILL / }, / system error */
	{ 0x1500, 0x04 /* SIGILL / }, / soft patch */
	{ 0x1600, 0x04 /* SIGILL / }, / maintenance */
	{ 0x1700, 0x08 /* SIGFPE / }, / altivec assist */
	{ 0x1800, 0x04 /* SIGILL / }, / thermal */
	#else /* ! CONFIG_PPC64 */
	{ 0x1400, 0x02 /* SIGINT / }, / SMI */
	{ 0x1600, 0x08 /* SIGFPE / }, / altivec assist */
	{ 0x1700, 0x04 /* SIGILL / }, / TAU */
	{ 0x2000, 0x05 /* SIGTRAP / }, / run mode */
	#endif
	#endif
	#endif
	{ 0x0000, 0x00 } /* 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 */
	}

	/**
	*
	* kgdb_skipexception - Bail out of KGDB when we've been triggered.
	* @exception: Exception vector number
	* @regs: Current &struct pt_regs.
	*
	* On some architectures we need to skip a breakpoint exception when
	* it occurs after a breakpoint has been removed.
	*
	*/
	int kgdb_skipexception(int exception, struct pt_regs *regs)
	{
	return kgdb_isremovedbreak(regs->nip);
	}

	static int kgdb_debugger_ipi(struct pt_regs *regs)
	{
	kgdb_nmicallback(raw_smp_processor_id(), regs);
	return 0;
	}

	#ifdef CONFIG_SMP
	void kgdb_roundup_cpus(void)
	{
	smp_send_debugger_break();
	}
	#endif

	/* KGDB functions to use existing PowerPC64 hooks. */
	static int kgdb_debugger(struct pt_regs *regs)
	{
	return !kgdb_handle_exception(1, computeSignal(TRAP(regs)),
	DIE_OOPS, regs);
	}

	static int kgdb_handle_breakpoint(struct pt_regs *regs)
	{
	if (user_mode(regs))
	return 0;

	if (kgdb_handle_exception(1, SIGTRAP, 0, regs) != 0)
	return 0;

	if ((u32 )regs->nip == BREAK_INSTR)
	regs_add_return_ip(regs, BREAK_INSTR_SIZE);

	return 1;
	}

	static int kgdb_singlestep(struct pt_regs *regs)
	{
	if (user_mode(regs))
	return 0;

	kgdb_handle_exception(0, SIGTRAP, 0, regs);

	return 1;
	}

	static int kgdb_iabr_match(struct pt_regs *regs)
	{
	if (user_mode(regs))
	return 0;

	if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0)
	return 0;
	return 1;
	}

	static int kgdb_break_match(struct pt_regs *regs)
	{
	if (user_mode(regs))
	return 0;

	if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0)
	return 0;
	return 1;
	}

	#define PACK64(ptr, src) do { *(ptr++) = (src); } while (0)

	#define PACK32(ptr, src) do { \
	u32 *ptr32; \
	ptr32 = (u32 *)ptr; \
	*(ptr32++) = (src); \
	ptr = (unsigned long *)ptr32; \
	} while (0)

	void sleeping_thread_to_gdb_regs(unsigned long gdb_regs, struct task_struct p)
	{
	struct pt_regs regs = (struct pt_regs )(p->thread.ksp +
	STACK_FRAME_OVERHEAD);
	unsigned long *ptr = gdb_regs;
	int reg;

	memset(gdb_regs, 0, NUMREGBYTES);

	/* Regs GPR0-2 */
	for (reg = 0; reg < 3; reg++)
	PACK64(ptr, regs->gpr[reg]);

	/* Regs GPR3-13 are caller saved, not in regs->gpr[] */
	ptr += 11;

	/* Regs GPR14-31 */
	for (reg = 14; reg < 32; reg++)
	PACK64(ptr, regs->gpr[reg]);

	#ifdef CONFIG_FSL_BOOKE
	#ifdef CONFIG_SPE
	for (reg = 0; reg < 32; reg++)
	PACK64(ptr, p->thread.evr[reg]);
	#else
	ptr += 32;
	#endif
	#else
	/* fp registers not used by kernel, leave zero */
	ptr += 32 * 8 / sizeof(long);
	#endif

	PACK64(ptr, regs->nip);
	PACK64(ptr, regs->msr);
	PACK32(ptr, regs->ccr);
	PACK64(ptr, regs->link);
	PACK64(ptr, regs->ctr);
	PACK32(ptr, regs->xer);

	BUG_ON((unsigned long)ptr >
	(unsigned long)(((void *)gdb_regs) + NUMREGBYTES));
	}

	#define GDB_SIZEOF_REG sizeof(unsigned long)
	#define GDB_SIZEOF_REG_U32 sizeof(u32)

	#ifdef CONFIG_FSL_BOOKE
	#define GDB_SIZEOF_FLOAT_REG sizeof(unsigned long)
	#else
	#define GDB_SIZEOF_FLOAT_REG sizeof(u64)
	#endif

	struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
	{
	{ "r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[0]) },
	{ "r1", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[1]) },
	{ "r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[2]) },
	{ "r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[3]) },
	{ "r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[4]) },
	{ "r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[5]) },
	{ "r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[6]) },
	{ "r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[7]) },
	{ "r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[8]) },
	{ "r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[9]) },
	{ "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[10]) },
	{ "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[11]) },
	{ "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[12]) },
	{ "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[13]) },
	{ "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[14]) },
	{ "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[15]) },
	{ "r16", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[16]) },
	{ "r17", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[17]) },
	{ "r18", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[18]) },
	{ "r19", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[19]) },
	{ "r20", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[20]) },
	{ "r21", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[21]) },
	{ "r22", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[22]) },
	{ "r23", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[23]) },
	{ "r24", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[24]) },
	{ "r25", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[25]) },
	{ "r26", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[26]) },
	{ "r27", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[27]) },
	{ "r28", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[28]) },
	{ "r29", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[29]) },
	{ "r30", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[30]) },
	{ "r31", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[31]) },

	{ "f0", GDB_SIZEOF_FLOAT_REG, 0 },
	{ "f1", GDB_SIZEOF_FLOAT_REG, 1 },
	{ "f2", GDB_SIZEOF_FLOAT_REG, 2 },
	{ "f3", GDB_SIZEOF_FLOAT_REG, 3 },
	{ "f4", GDB_SIZEOF_FLOAT_REG, 4 },
	{ "f5", GDB_SIZEOF_FLOAT_REG, 5 },
	{ "f6", GDB_SIZEOF_FLOAT_REG, 6 },
	{ "f7", GDB_SIZEOF_FLOAT_REG, 7 },
	{ "f8", GDB_SIZEOF_FLOAT_REG, 8 },
	{ "f9", GDB_SIZEOF_FLOAT_REG, 9 },
	{ "f10", GDB_SIZEOF_FLOAT_REG, 10 },
	{ "f11", GDB_SIZEOF_FLOAT_REG, 11 },
	{ "f12", GDB_SIZEOF_FLOAT_REG, 12 },
	{ "f13", GDB_SIZEOF_FLOAT_REG, 13 },
	{ "f14", GDB_SIZEOF_FLOAT_REG, 14 },
	{ "f15", GDB_SIZEOF_FLOAT_REG, 15 },
	{ "f16", GDB_SIZEOF_FLOAT_REG, 16 },
	{ "f17", GDB_SIZEOF_FLOAT_REG, 17 },
	{ "f18", GDB_SIZEOF_FLOAT_REG, 18 },
	{ "f19", GDB_SIZEOF_FLOAT_REG, 19 },
	{ "f20", GDB_SIZEOF_FLOAT_REG, 20 },
	{ "f21", GDB_SIZEOF_FLOAT_REG, 21 },
	{ "f22", GDB_SIZEOF_FLOAT_REG, 22 },
	{ "f23", GDB_SIZEOF_FLOAT_REG, 23 },
	{ "f24", GDB_SIZEOF_FLOAT_REG, 24 },
	{ "f25", GDB_SIZEOF_FLOAT_REG, 25 },
	{ "f26", GDB_SIZEOF_FLOAT_REG, 26 },
	{ "f27", GDB_SIZEOF_FLOAT_REG, 27 },
	{ "f28", GDB_SIZEOF_FLOAT_REG, 28 },
	{ "f29", GDB_SIZEOF_FLOAT_REG, 29 },
	{ "f30", GDB_SIZEOF_FLOAT_REG, 30 },
	{ "f31", GDB_SIZEOF_FLOAT_REG, 31 },

	{ "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, nip) },
	{ "msr", GDB_SIZEOF_REG, offsetof(struct pt_regs, msr) },
	{ "cr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ccr) },
	{ "lr", GDB_SIZEOF_REG, offsetof(struct pt_regs, link) },
	{ "ctr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ctr) },
	{ "xer", GDB_SIZEOF_REG, offsetof(struct pt_regs, xer) },
	};

	char dbg_get_reg(int regno, void mem, struct pt_regs *regs)
	{
	if (regno >= DBG_MAX_REG_NUM \|\| regno < 0)
	return NULL;

	if (regno < 32 \|\| regno >= 64)
	/* First 0 -> 31 gpr registers*/
	/* pc, msr, ls... registers 64 -> 69 */
	memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
	dbg_reg_def[regno].size);

	if (regno >= 32 && regno < 64) {
	/* FP registers 32 -> 63 */
	#if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
	if (current)
	memcpy(mem, &current->thread.evr[regno-32],
	dbg_reg_def[regno].size);
	#else
	/* fp registers not used by kernel, leave zero */
	memset(mem, 0, dbg_reg_def[regno].size);
	#endif
	}

	return dbg_reg_def[regno].name;
	}

	int dbg_set_reg(int regno, void mem, struct pt_regs regs)
	{
	if (regno >= DBG_MAX_REG_NUM \|\| regno < 0)
	return -EINVAL;

	if (regno < 32 \|\| regno >= 64)
	/* First 0 -> 31 gpr registers*/
	/* pc, msr, ls... registers 64 -> 69 */
	memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
	dbg_reg_def[regno].size);

	if (regno >= 32 && regno < 64) {
	/* FP registers 32 -> 63 */
	#if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
	memcpy(&current->thread.evr[regno-32], mem,
	dbg_reg_def[regno].size);
	#else
	/* fp registers not used by kernel, leave zero */
	return 0;
	#endif
	}

	return 0;
	}

	void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
	{
	regs_set_return_ip(regs, pc);
	}

	/*
	* This function does PowerPC specific processing for interfacing to gdb.
	*/
	int kgdb_arch_handle_exception(int vector, int signo, int err_code,
	char remcom_in_buffer, char remcom_out_buffer,
	struct pt_regs *linux_regs)
	{
	char *ptr = &remcom_in_buffer[1];
	unsigned long addr;

	switch (remcom_in_buffer[0]) {
	/*
	* sAA..AA Step one instruction from AA..AA
	* This will return an error to gdb ..
	*/
	case 's':
	case 'c':
	/* handle the optional parameter */
	if (kgdb_hex2long(&ptr, &addr))
	regs_set_return_ip(linux_regs, addr);

	atomic_set(&kgdb_cpu_doing_single_step, -1);
	/* set the trace bit if we're stepping */
	if (remcom_in_buffer[0] == 's') {
	#ifdef CONFIG_PPC_ADV_DEBUG_REGS
	mtspr(SPRN_DBCR0,
	mfspr(SPRN_DBCR0) \| DBCR0_IC \| DBCR0_IDM);
	regs_set_return_msr(linux_regs, linux_regs->msr \| MSR_DE);
	#else
	regs_set_return_msr(linux_regs, linux_regs->msr \| MSR_SE);
	#endif
	atomic_set(&kgdb_cpu_doing_single_step,
	raw_smp_processor_id());
	}
	return 0;
	}

	return -1;
	}

	int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
	{
	u32 instr, addr = (u32 )bpt->bpt_addr;
	int err;

	err = get_kernel_nofault(instr, addr);
	if (err)
	return err;

	err = patch_instruction(addr, ppc_inst(BREAK_INSTR));
	if (err)
	return -EFAULT;

	(u32 )bpt->saved_instr = instr;

	return 0;
	}

	int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt)
	{
	int err;
	unsigned int instr = (unsigned int )bpt->saved_instr;
	u32 addr = (u32 )bpt->bpt_addr;

	err = patch_instruction(addr, ppc_inst(instr));
	if (err)
	return -EFAULT;

	return 0;
	}

	/*
	* Global data
	*/
	const struct kgdb_arch arch_kgdb_ops;

	static int kgdb_not_implemented(struct pt_regs *regs)
	{
	return 0;
	}

	static void *old__debugger_ipi;
	static void *old__debugger;
	static void *old__debugger_bpt;
	static void *old__debugger_sstep;
	static void *old__debugger_iabr_match;
	static void *old__debugger_break_match;
	static void *old__debugger_fault_handler;

	int kgdb_arch_init(void)
	{
	old__debugger_ipi = __debugger_ipi;
	old__debugger = __debugger;
	old__debugger_bpt = __debugger_bpt;
	old__debugger_sstep = __debugger_sstep;
	old__debugger_iabr_match = __debugger_iabr_match;
	old__debugger_break_match = __debugger_break_match;
	old__debugger_fault_handler = __debugger_fault_handler;

	__debugger_ipi = kgdb_debugger_ipi;
	__debugger = kgdb_debugger;
	__debugger_bpt = kgdb_handle_breakpoint;
	__debugger_sstep = kgdb_singlestep;
	__debugger_iabr_match = kgdb_iabr_match;
	__debugger_break_match = kgdb_break_match;
	__debugger_fault_handler = kgdb_not_implemented;

	return 0;
	}

	void kgdb_arch_exit(void)
	{
	__debugger_ipi = old__debugger_ipi;
	__debugger = old__debugger;
	__debugger_bpt = old__debugger_bpt;
	__debugger_sstep = old__debugger_sstep;
	__debugger_iabr_match = old__debugger_iabr_match;
	__debugger_break_match = old__debugger_break_match;
	__debugger_fault_handler = old__debugger_fault_handler;
	}