[linux-block.git] / arch / powerpc / kernel / kgdb.c

/*
 * 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 */
#if defined(CONFIG_40x) || defined(CONFIG_BOOKE)
	{ 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 /* ! (defined(CONFIG_40x) || defined(CONFIG_BOOKE)) */
	{ 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->nip += 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->nip = pc;
}

/*
 * This function does PowerPC specific procesing 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))
			linux_regs->nip = 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);
			linux_regs->msr |= MSR_DE;
#else
			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)
{
	int err;
	unsigned int instr;
	struct ppc_inst *addr = (struct ppc_inst *)bpt->bpt_addr;

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

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

	*(unsigned int *)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;
	struct ppc_inst *addr = (struct ppc_inst *)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;
}
Commit	Line	Data
17ce452f JW	1	/*
	2	* PowerPC backend to the KGDB stub.
	3	*
	4	* 1998 (c) Michael AK Tesch (tesch@cs.wisc.edu)
	5	* Copyright (C) 2003 Timesys Corporation.
	6	* Copyright (C) 2004-2006 MontaVista Software, Inc.
	7	* PPC64 Mods (C) 2005 Frank Rowand (frowand@mvista.com)
	8	* PPC32 support restored by Vitaly Wool <vwool@ru.mvista.com> and
	9	* Sergei Shtylyov <sshtylyov@ru.mvista.com>
	10	* Copyright (C) 2007-2008 Wind River Systems, Inc.
	11	*
	12	* This file is licensed under the terms of the GNU General Public License
	13	* version 2. This program as licensed "as is" without any warranty of any
	14	* kind, whether express or implied.
	15	*/
	16
	17	#include <linux/kernel.h>
17ce452f JW	18	#include <linux/kgdb.h>
	19	#include <linux/smp.h>
	20	#include <linux/signal.h>
	21	#include <linux/ptrace.h>
ba797b28	22	#include <linux/kdebug.h>
17ce452f JW	23	#include <asm/current.h>
	24	#include <asm/processor.h>
	25	#include <asm/machdep.h>
cad3c834	26	#include <asm/debug.h>
fb978ca2	27	#include <asm/code-patching.h>
5f630401	28	#include <linux/slab.h>
75346251	29	#include <asm/inst.h>
17ce452f JW	30
	31	/*
	32	* This table contains the mapping between PowerPC hardware trap types, and
	33	* signals, which are primarily what GDB understands. GDB and the kernel
	34	* don't always agree on values, so we use constants taken from gdb-6.2.
	35	*/
	36	static struct hard_trap_info
	37	{
	38	unsigned int tt; /* Trap type code for powerpc */
	39	unsigned char signo; /* Signal that we map this trap into */
	40	} hard_trap_info[] = {
	41	{ 0x0100, 0x02 /* SIGINT / }, / system reset */
	42	{ 0x0200, 0x0b /* SIGSEGV / }, / machine check */
	43	{ 0x0300, 0x0b /* SIGSEGV / }, / data access */
	44	{ 0x0400, 0x0b /* SIGSEGV / }, / instruction access */
	45	{ 0x0500, 0x02 /* SIGINT / }, / external interrupt */
	46	{ 0x0600, 0x0a /* SIGBUS / }, / alignment */
	47	{ 0x0700, 0x05 /* SIGTRAP / }, / program check */
	48	{ 0x0800, 0x08 /* SIGFPE / }, / fp unavailable */
	49	{ 0x0900, 0x0e /* SIGALRM / }, / decrementer */
	50	{ 0x0c00, 0x14 /* SIGCHLD / }, / system call */
	51	#if defined(CONFIG_40x) \|\| defined(CONFIG_BOOKE)
	52	{ 0x2002, 0x05 /* SIGTRAP / }, / debug */
	53	#if defined(CONFIG_FSL_BOOKE)
	54	{ 0x2010, 0x08 /* SIGFPE / }, / spe unavailable */
	55	{ 0x2020, 0x08 /* SIGFPE / }, / spe unavailable */
	56	{ 0x2030, 0x08 /* SIGFPE / }, / spe fp data */
	57	{ 0x2040, 0x08 /* SIGFPE / }, / spe fp data */
	58	{ 0x2050, 0x08 /* SIGFPE / }, / spe fp round */
af901ca1	59	{ 0x2060, 0x0e /* SIGILL / }, / performance monitor */
17ce452f JW	60	{ 0x2900, 0x08 /* SIGFPE / }, / apu unavailable */
	61	{ 0x3100, 0x0e /* SIGALRM / }, / fixed interval timer */
	62	{ 0x3200, 0x02 /* SIGINT / }, / watchdog */
	63	#else /* ! CONFIG_FSL_BOOKE */
	64	{ 0x1000, 0x0e /* SIGALRM / }, / prog interval timer */
	65	{ 0x1010, 0x0e /* SIGALRM / }, / fixed interval timer */
	66	{ 0x1020, 0x02 /* SIGINT / }, / watchdog */
	67	{ 0x2010, 0x08 /* SIGFPE / }, / fp unavailable */
	68	{ 0x2020, 0x08 /* SIGFPE / }, / ap unavailable */
	69	#endif
	70	#else /* ! (defined(CONFIG_40x) \|\| defined(CONFIG_BOOKE)) */
	71	{ 0x0d00, 0x05 /* SIGTRAP / }, / single-step */
968159c0	72	#if defined(CONFIG_PPC_8xx)
17ce452f	73	{ 0x1000, 0x04 /* SIGILL / }, / software emulation */
968159c0	74	#else /* ! CONFIG_PPC_8xx */
17ce452f JW	75	{ 0x0f00, 0x04 /* SIGILL / }, / performance monitor */
	76	{ 0x0f20, 0x08 /* SIGFPE / }, / altivec unavailable */
	77	{ 0x1300, 0x05 /* SIGTRAP / }, / instruction address break */
	78	#if defined(CONFIG_PPC64)
	79	{ 0x1200, 0x05 /* SIGILL / }, / system error */
	80	{ 0x1500, 0x04 /* SIGILL / }, / soft patch */
	81	{ 0x1600, 0x04 /* SIGILL / }, / maintenance */
	82	{ 0x1700, 0x08 /* SIGFPE / }, / altivec assist */
	83	{ 0x1800, 0x04 /* SIGILL / }, / thermal */
	84	#else /* ! CONFIG_PPC64 */
	85	{ 0x1400, 0x02 /* SIGINT / }, / SMI */
	86	{ 0x1600, 0x08 /* SIGFPE / }, / altivec assist */
	87	{ 0x1700, 0x04 /* SIGILL / }, / TAU */
	88	{ 0x2000, 0x05 /* SIGTRAP / }, / run mode */
	89	#endif
	90	#endif
	91	#endif
	92	{ 0x0000, 0x00 } /* Must be last */
	93	};
	94
	95	static int computeSignal(unsigned int tt)
	96	{
	97	struct hard_trap_info *ht;
	98
	99	for (ht = hard_trap_info; ht->tt && ht->signo; ht++)
	100	if (ht->tt == tt)
	101	return ht->signo;
	102
	103	return SIGHUP; /* default for things we don't know about */
	104	}
	105
949616cf TC	106	/**
	107	*
	108	* kgdb_skipexception - Bail out of KGDB when we've been triggered.
	109	* @exception: Exception vector number
	110	* @regs: Current &struct pt_regs.
	111	*
	112	* On some architectures we need to skip a breakpoint exception when
	113	* it occurs after a breakpoint has been removed.
	114	*
	115	*/
	116	int kgdb_skipexception(int exception, struct pt_regs *regs)
	117	{
	118	return kgdb_isremovedbreak(regs->nip);
	119	}
	120
3cd99ac3	121	static int kgdb_debugger_ipi(struct pt_regs *regs)
17ce452f JW	122	{
	123	kgdb_nmicallback(raw_smp_processor_id(), regs);
	124	return 0;
	125	}
	126
	127	#ifdef CONFIG_SMP
9ef7fa50	128	void kgdb_roundup_cpus(void)
17ce452f	129	{
e0476371	130	smp_send_debugger_break();
17ce452f JW	131	}
	132	#endif
	133
	134	/* KGDB functions to use existing PowerPC64 hooks. */
	135	static int kgdb_debugger(struct pt_regs *regs)
	136	{
ba797b28 JW	137	return !kgdb_handle_exception(1, computeSignal(TRAP(regs)),
ba797b28 JW	138	DIE_OOPS, regs);
17ce452f JW	139	}
	140
	141	static int kgdb_handle_breakpoint(struct pt_regs *regs)
	142	{
	143	if (user_mode(regs))
	144	return 0;
	145
ba797b28	146	if (kgdb_handle_exception(1, SIGTRAP, 0, regs) != 0)
17ce452f JW	147	return 0;
17ce452f JW	148
fb978ca2	149	if ((u32 )regs->nip == BREAK_INSTR)
3f0a55e3	150	regs->nip += BREAK_INSTR_SIZE;
17ce452f JW	151
	152	return 1;
	153	}
	154
	155	static int kgdb_singlestep(struct pt_regs *regs)
	156	{
17ce452f JW	157	if (user_mode(regs))
	158	return 0;
	159
17ce452f JW	160	kgdb_handle_exception(0, SIGTRAP, 0, regs);
17ce452f JW	161
17ce452f JW	162	return 1;
	163	}
	164
	165	static int kgdb_iabr_match(struct pt_regs *regs)
	166	{
	167	if (user_mode(regs))
	168	return 0;
	169
	170	if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0)
	171	return 0;
	172	return 1;
	173	}
	174
9422de3e	175	static int kgdb_break_match(struct pt_regs *regs)
17ce452f JW	176	{
	177	if (user_mode(regs))
	178	return 0;
	179
	180	if (kgdb_handle_exception(0, computeSignal(TRAP(regs)), 0, regs) != 0)
	181	return 0;
	182	return 1;
	183	}
	184
	185	#define PACK64(ptr, src) do { *(ptr++) = (src); } while (0)
	186
	187	#define PACK32(ptr, src) do { \
	188	u32 *ptr32; \
	189	ptr32 = (u32 *)ptr; \
	190	*(ptr32++) = (src); \
	191	ptr = (unsigned long *)ptr32; \
	192	} while (0)
	193
17ce452f JW	194	void sleeping_thread_to_gdb_regs(unsigned long gdb_regs, struct task_struct p)
	195	{
	196	struct pt_regs regs = (struct pt_regs )(p->thread.ksp +
	197	STACK_FRAME_OVERHEAD);
	198	unsigned long *ptr = gdb_regs;
	199	int reg;
	200
	201	memset(gdb_regs, 0, NUMREGBYTES);
	202
	203	/* Regs GPR0-2 */
	204	for (reg = 0; reg < 3; reg++)
	205	PACK64(ptr, regs->gpr[reg]);
	206
	207	/* Regs GPR3-13 are caller saved, not in regs->gpr[] */
	208	ptr += 11;
	209
	210	/* Regs GPR14-31 */
	211	for (reg = 14; reg < 32; reg++)
	212	PACK64(ptr, regs->gpr[reg]);
	213
	214	#ifdef CONFIG_FSL_BOOKE
	215	#ifdef CONFIG_SPE
	216	for (reg = 0; reg < 32; reg++)
	217	PACK64(ptr, p->thread.evr[reg]);
	218	#else
	219	ptr += 32;
	220	#endif
	221	#else
	222	/* fp registers not used by kernel, leave zero */
	223	ptr += 32 * 8 / sizeof(long);
	224	#endif
	225
	226	PACK64(ptr, regs->nip);
	227	PACK64(ptr, regs->msr);
	228	PACK32(ptr, regs->ccr);
	229	PACK64(ptr, regs->link);
	230	PACK64(ptr, regs->ctr);
	231	PACK32(ptr, regs->xer);
	232
	233	BUG_ON((unsigned long)ptr >
	234	(unsigned long)(((void *)gdb_regs) + NUMREGBYTES));
	235	}
	236
ff10b88b DD	237	#define GDB_SIZEOF_REG sizeof(unsigned long)
ff10b88b DD	238	#define GDB_SIZEOF_REG_U32 sizeof(u32)
17ce452f	239
ff10b88b DD	240	#ifdef CONFIG_FSL_BOOKE
	241	#define GDB_SIZEOF_FLOAT_REG sizeof(unsigned long)
	242	#else
	243	#define GDB_SIZEOF_FLOAT_REG sizeof(u64)
	244	#endif
17ce452f	245
ff10b88b	246	struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] =
17ce452f	247	{
ff10b88b DD	248	{ "r0", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[0]) },
	249	{ "r1", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[1]) },
	250	{ "r2", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[2]) },
	251	{ "r3", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[3]) },
	252	{ "r4", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[4]) },
	253	{ "r5", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[5]) },
	254	{ "r6", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[6]) },
	255	{ "r7", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[7]) },
	256	{ "r8", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[8]) },
	257	{ "r9", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[9]) },
	258	{ "r10", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[10]) },
	259	{ "r11", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[11]) },
	260	{ "r12", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[12]) },
	261	{ "r13", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[13]) },
	262	{ "r14", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[14]) },
	263	{ "r15", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[15]) },
	264	{ "r16", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[16]) },
	265	{ "r17", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[17]) },
	266	{ "r18", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[18]) },
	267	{ "r19", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[19]) },
	268	{ "r20", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[20]) },
	269	{ "r21", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[21]) },
	270	{ "r22", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[22]) },
	271	{ "r23", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[23]) },
	272	{ "r24", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[24]) },
	273	{ "r25", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[25]) },
	274	{ "r26", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[26]) },
	275	{ "r27", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[27]) },
	276	{ "r28", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[28]) },
	277	{ "r29", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[29]) },
	278	{ "r30", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[30]) },
	279	{ "r31", GDB_SIZEOF_REG, offsetof(struct pt_regs, gpr[31]) },
	280
	281	{ "f0", GDB_SIZEOF_FLOAT_REG, 0 },
	282	{ "f1", GDB_SIZEOF_FLOAT_REG, 1 },
	283	{ "f2", GDB_SIZEOF_FLOAT_REG, 2 },
	284	{ "f3", GDB_SIZEOF_FLOAT_REG, 3 },
	285	{ "f4", GDB_SIZEOF_FLOAT_REG, 4 },
	286	{ "f5", GDB_SIZEOF_FLOAT_REG, 5 },
	287	{ "f6", GDB_SIZEOF_FLOAT_REG, 6 },
	288	{ "f7", GDB_SIZEOF_FLOAT_REG, 7 },
	289	{ "f8", GDB_SIZEOF_FLOAT_REG, 8 },
	290	{ "f9", GDB_SIZEOF_FLOAT_REG, 9 },
	291	{ "f10", GDB_SIZEOF_FLOAT_REG, 10 },
	292	{ "f11", GDB_SIZEOF_FLOAT_REG, 11 },
	293	{ "f12", GDB_SIZEOF_FLOAT_REG, 12 },
	294	{ "f13", GDB_SIZEOF_FLOAT_REG, 13 },
	295	{ "f14", GDB_SIZEOF_FLOAT_REG, 14 },
	296	{ "f15", GDB_SIZEOF_FLOAT_REG, 15 },
	297	{ "f16", GDB_SIZEOF_FLOAT_REG, 16 },
	298	{ "f17", GDB_SIZEOF_FLOAT_REG, 17 },
	299	{ "f18", GDB_SIZEOF_FLOAT_REG, 18 },
	300	{ "f19", GDB_SIZEOF_FLOAT_REG, 19 },
	301	{ "f20", GDB_SIZEOF_FLOAT_REG, 20 },
	302	{ "f21", GDB_SIZEOF_FLOAT_REG, 21 },
	303	{ "f22", GDB_SIZEOF_FLOAT_REG, 22 },
	304	{ "f23", GDB_SIZEOF_FLOAT_REG, 23 },
	305	{ "f24", GDB_SIZEOF_FLOAT_REG, 24 },
	306	{ "f25", GDB_SIZEOF_FLOAT_REG, 25 },
	307	{ "f26", GDB_SIZEOF_FLOAT_REG, 26 },
	308	{ "f27", GDB_SIZEOF_FLOAT_REG, 27 },
	309	{ "f28", GDB_SIZEOF_FLOAT_REG, 28 },
	310	{ "f29", GDB_SIZEOF_FLOAT_REG, 29 },
	311	{ "f30", GDB_SIZEOF_FLOAT_REG, 30 },
312	{ "f31", GDB_SIZEOF_FLOAT_REG, 31 },
313
314	{ "pc", GDB_SIZEOF_REG, offsetof(struct pt_regs, nip) },
315	{ "msr", GDB_SIZEOF_REG, offsetof(struct pt_regs, msr) },
316	{ "cr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ccr) },
317	{ "lr", GDB_SIZEOF_REG, offsetof(struct pt_regs, link) },
318	{ "ctr", GDB_SIZEOF_REG_U32, offsetof(struct pt_regs, ctr) },
319	{ "xer", GDB_SIZEOF_REG, offsetof(struct pt_regs, xer) },
320	};
17ce452f	321
ff10b88b DD	322	char dbg_get_reg(int regno, void mem, struct pt_regs *regs)
	323	{
	324	if (regno >= DBG_MAX_REG_NUM \|\| regno < 0)
	325	return NULL;
	326
	327	if (regno < 32 \|\| regno >= 64)
	328	/* First 0 -> 31 gpr registers*/
	329	/* pc, msr, ls... registers 64 -> 69 */
	330	memcpy(mem, (void *)regs + dbg_reg_def[regno].offset,
	331	dbg_reg_def[regno].size);
	332
	333	if (regno >= 32 && regno < 64) {
	334	/* FP registers 32 -> 63 */
	335	#if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
	336	if (current)
e3839ed8	337	memcpy(mem, &current->thread.evr[regno-32],
ff10b88b	338	dbg_reg_def[regno].size);
17ce452f	339	#else
ff10b88b DD	340	/* fp registers not used by kernel, leave zero */
ff10b88b DD	341	memset(mem, 0, dbg_reg_def[regno].size);
17ce452f	342	#endif
ff10b88b DD	343	}
	344
	345	return dbg_reg_def[regno].name;
	346	}
	347
	348	int dbg_set_reg(int regno, void mem, struct pt_regs regs)
	349	{
	350	if (regno >= DBG_MAX_REG_NUM \|\| regno < 0)
	351	return -EINVAL;
	352
	353	if (regno < 32 \|\| regno >= 64)
	354	/* First 0 -> 31 gpr registers*/
	355	/* pc, msr, ls... registers 64 -> 69 */
	356	memcpy((void *)regs + dbg_reg_def[regno].offset, mem,
	357	dbg_reg_def[regno].size);
	358
	359	if (regno >= 32 && regno < 64) {
	360	/* FP registers 32 -> 63 */
	361	#if defined(CONFIG_FSL_BOOKE) && defined(CONFIG_SPE)
e3839ed8	362	memcpy(&current->thread.evr[regno-32], mem,
ff10b88b	363	dbg_reg_def[regno].size);
17ce452f	364	#else
ff10b88b DD	365	/* fp registers not used by kernel, leave zero */
ff10b88b DD	366	return 0;
17ce452f	367	#endif
ff10b88b	368	}
17ce452f	369
ff10b88b	370	return 0;
17ce452f JW	371	}
17ce452f JW	372
dcc78711 JW	373	void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc)
	374	{
	375	regs->nip = pc;
	376	}
	377
17ce452f JW	378	/*
	379	* This function does PowerPC specific procesing for interfacing to gdb.
	380	*/
	381	int kgdb_arch_handle_exception(int vector, int signo, int err_code,
	382	char remcom_in_buffer, char remcom_out_buffer,
	383	struct pt_regs *linux_regs)
	384	{
	385	char *ptr = &remcom_in_buffer[1];
	386	unsigned long addr;
	387
	388	switch (remcom_in_buffer[0]) {
	389	/*
	390	* sAA..AA Step one instruction from AA..AA
	391	* This will return an error to gdb ..
	392	*/
	393	case 's':
	394	case 'c':
	395	/* handle the optional parameter */
	396	if (kgdb_hex2long(&ptr, &addr))
	397	linux_regs->nip = addr;
	398
	399	atomic_set(&kgdb_cpu_doing_single_step, -1);
	400	/* set the trace bit if we're stepping */
	401	if (remcom_in_buffer[0] == 's') {
172ae2e7	402	#ifdef CONFIG_PPC_ADV_DEBUG_REGS
17ce452f JW	403	mtspr(SPRN_DBCR0,
	404	mfspr(SPRN_DBCR0) \| DBCR0_IC \| DBCR0_IDM);
	405	linux_regs->msr \|= MSR_DE;
	406	#else
	407	linux_regs->msr \|= MSR_SE;
	408	#endif
d7161a65 JW	409	atomic_set(&kgdb_cpu_doing_single_step,
d7161a65 JW	410	raw_smp_processor_id());
17ce452f JW	411	}
	412	return 0;
	413	}
	414
	415	return -1;
	416	}
	417
fb978ca2 CL	418	int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt)
	419	{
	420	int err;
	421	unsigned int instr;
94afd069	422	struct ppc_inst addr = (struct ppc_inst )bpt->bpt_addr;
fb978ca2	423
0c389d89	424	err = get_kernel_nofault(instr, (unsigned *) addr);
fb978ca2 CL	425	if (err)
	426	return err;
	427
75346251	428	err = patch_instruction(addr, ppc_inst(BREAK_INSTR));
fb978ca2 CL	429	if (err)
	430	return -EFAULT;
	431
	432	(unsigned int )bpt->saved_instr = instr;
	433
	434	return 0;
	435	}
	436
	437	int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt)
	438	{
	439	int err;
	440	unsigned int instr = (unsigned int )bpt->saved_instr;
94afd069	441	struct ppc_inst addr = (struct ppc_inst )bpt->bpt_addr;
fb978ca2	442
75346251	443	err = patch_instruction(addr, ppc_inst(instr));
fb978ca2 CL	444	if (err)
	445	return -EFAULT;
	446
	447	return 0;
	448	}
	449
17ce452f JW	450	/*
	451	* Global data
	452	*/
cc028297	453	const struct kgdb_arch arch_kgdb_ops;
17ce452f JW	454
	455	static int kgdb_not_implemented(struct pt_regs *regs)
	456	{
	457	return 0;
	458	}
	459
	460	static void *old__debugger_ipi;
	461	static void *old__debugger;
	462	static void *old__debugger_bpt;
	463	static void *old__debugger_sstep;
	464	static void *old__debugger_iabr_match;
9422de3e	465	static void *old__debugger_break_match;
17ce452f JW	466	static void *old__debugger_fault_handler;
	467
	468	int kgdb_arch_init(void)
	469	{
	470	old__debugger_ipi = __debugger_ipi;
	471	old__debugger = __debugger;
	472	old__debugger_bpt = __debugger_bpt;
	473	old__debugger_sstep = __debugger_sstep;
	474	old__debugger_iabr_match = __debugger_iabr_match;
9422de3e	475	old__debugger_break_match = __debugger_break_match;
17ce452f JW	476	old__debugger_fault_handler = __debugger_fault_handler;
17ce452f JW	477
3cd99ac3	478	__debugger_ipi = kgdb_debugger_ipi;
17ce452f JW	479	__debugger = kgdb_debugger;
	480	__debugger_bpt = kgdb_handle_breakpoint;
	481	__debugger_sstep = kgdb_singlestep;
	482	__debugger_iabr_match = kgdb_iabr_match;
9422de3e	483	__debugger_break_match = kgdb_break_match;
17ce452f JW	484	__debugger_fault_handler = kgdb_not_implemented;
	485
	486	return 0;
	487	}
	488
	489	void kgdb_arch_exit(void)
	490	{
	491	__debugger_ipi = old__debugger_ipi;
	492	__debugger = old__debugger;
	493	__debugger_bpt = old__debugger_bpt;
	494	__debugger_sstep = old__debugger_sstep;
	495	__debugger_iabr_match = old__debugger_iabr_match;
fa592464	496	__debugger_break_match = old__debugger_break_match;
17ce452f JW	497	__debugger_fault_handler = old__debugger_fault_handler;
17ce452f JW	498	}