Pull regset into release branch

2 files changed, 895 insertions, 352 deletions

diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index 49937a383b2..a5ea817cbcb 100644
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -625,21 +625,6 @@ do_dump_fpu (struct unw_frame_info *info, void *arg)
 	do_dump_task_fpu(current, info, arg);
 }
 
-int
-dump_task_regs(struct task_struct *task, elf_gregset_t *regs)
-{
-	struct unw_frame_info tcore_info;
-
-	if (current == task) {
-		unw_init_running(do_copy_regs, regs);
-	} else {
-		memset(&tcore_info, 0, sizeof(tcore_info));
-		unw_init_from_blocked_task(&tcore_info, task);
-		do_copy_task_regs(task, &tcore_info, regs);
-	}
-	return 1;
-}
-
 void
 ia64_elf_core_copy_regs (struct pt_regs *pt, elf_gregset_t dst)
 {
@@ -647,21 +632,6 @@ ia64_elf_core_copy_regs (struct pt_regs *pt, elf_gregset_t dst)
 }
 
 int
-dump_task_fpu (struct task_struct *task, elf_fpregset_t *dst)
-{
-	struct unw_frame_info tcore_info;
-
-	if (current == task) {
-		unw_init_running(do_dump_fpu, dst);
-	} else {
-		memset(&tcore_info, 0, sizeof(tcore_info));
-		unw_init_from_blocked_task(&tcore_info, task);
-		do_dump_task_fpu(task, &tcore_info, dst);
-	}
-	return 1;
-}
-
-int
 dump_fpu (struct pt_regs *pt, elf_fpregset_t dst)
 {
 	unw_init_running(do_dump_fpu, dst);
diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c
index ab784ec4319..2a9943b5947 100644
--- a/arch/ia64/kernel/ptrace.c
+++ b/arch/ia64/kernel/ptrace.c
@@ -3,6 +3,9 @@
  *
  * Copyright (C) 1999-2005 Hewlett-Packard Co
  *	David Mosberger-Tang <davidm@hpl.hp.com>
+ * Copyright (C) 2006 Intel Co
+ *  2006-08-12	- IA64 Native Utrace implementation support added by
+ *	Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
  *
  * Derived from the x86 and Alpha versions.
  */
@@ -17,6 +20,8 @@
 #include <linux/security.h>
 #include <linux/audit.h>
 #include <linux/signal.h>
+#include <linux/regset.h>
+#include <linux/elf.h>
 
 #include <asm/pgtable.h>
 #include <asm/processor.h>
@@ -740,25 +745,6 @@ ia64_sync_fph (struct task_struct *task)
 	psr->dfh = 1;
 }
 
-static int
-access_fr (struct unw_frame_info *info, int regnum, int hi,
-	   unsigned long *data, int write_access)
-{
-	struct ia64_fpreg fpval;
-	int ret;
-
-	ret = unw_get_fr(info, regnum, &fpval);
-	if (ret < 0)
-		return ret;
-
-	if (write_access) {
-		fpval.u.bits[hi] = *data;
-		ret = unw_set_fr(info, regnum, fpval);
-	} else
-		*data = fpval.u.bits[hi];
-	return ret;
-}
-
 /*
  * Change the machine-state of CHILD such that it will return via the normal
  * kernel exit-path, rather than the syscall-exit path.
@@ -860,309 +846,7 @@ access_nat_bits (struct task_struct *child, struct pt_regs *pt,
 
 static int
 access_uarea (struct task_struct *child, unsigned long addr,
-	      unsigned long *data, int write_access)
-{
-	unsigned long *ptr, regnum, urbs_end, cfm;
-	struct switch_stack *sw;
-	struct pt_regs *pt;
-#	define pt_reg_addr(pt, reg)	((void *)			    \
-					 ((unsigned long) (pt)		    \
-					  + offsetof(struct pt_regs, reg)))
-
-
-	pt = task_pt_regs(child);
-	sw = (struct switch_stack *) (child->thread.ksp + 16);
-
-	if ((addr & 0x7) != 0) {
-		dprintk("ptrace: unaligned register address 0x%lx\n", addr);
-		return -1;
-	}
-
-	if (addr < PT_F127 + 16) {
-		/* accessing fph */
-		if (write_access)
-			ia64_sync_fph(child);
-		else
-			ia64_flush_fph(child);
-		ptr = (unsigned long *)
-			((unsigned long) &child->thread.fph + addr);
-	} else if ((addr >= PT_F10) && (addr < PT_F11 + 16)) {
-		/* scratch registers untouched by kernel (saved in pt_regs) */
-		ptr = pt_reg_addr(pt, f10) + (addr - PT_F10);
-	} else if (addr >= PT_F12 && addr < PT_F15 + 16) {
-		/*
-		 * Scratch registers untouched by kernel (saved in
-		 * switch_stack).
-		 */
-		ptr = (unsigned long *) ((long) sw
-					 + (addr - PT_NAT_BITS - 32));
-	} else if (addr < PT_AR_LC + 8) {
-		/* preserved state: */
-		struct unw_frame_info info;
-		char nat = 0;
-		int ret;
-
-		unw_init_from_blocked_task(&info, child);
-		if (unw_unwind_to_user(&info) < 0)
-			return -1;
-
-		switch (addr) {
-		      case PT_NAT_BITS:
-			return access_nat_bits(child, pt, &info,
-					       data, write_access);
-
-		      case PT_R4: case PT_R5: case PT_R6: case PT_R7:
-			if (write_access) {
-				/* read NaT bit first: */
-				unsigned long dummy;
-
-				ret = unw_get_gr(&info, (addr - PT_R4)/8 + 4,
-						 &dummy, &nat);
-				if (ret < 0)
-					return ret;
-			}
-			return unw_access_gr(&info, (addr - PT_R4)/8 + 4, data,
-					     &nat, write_access);
-
-		      case PT_B1: case PT_B2: case PT_B3:
-		      case PT_B4: case PT_B5:
-			return unw_access_br(&info, (addr - PT_B1)/8 + 1, data,
-					     write_access);
-
-		      case PT_AR_EC:
-			return unw_access_ar(&info, UNW_AR_EC, data,
-					     write_access);
-
-		      case PT_AR_LC:
-			return unw_access_ar(&info, UNW_AR_LC, data,
-					     write_access);
-
-		      default:
-			if (addr >= PT_F2 && addr < PT_F5 + 16)
-				return access_fr(&info, (addr - PT_F2)/16 + 2,
-						 (addr & 8) != 0, data,
-						 write_access);
-			else if (addr >= PT_F16 && addr < PT_F31 + 16)
-				return access_fr(&info,
-						 (addr - PT_F16)/16 + 16,
-						 (addr & 8) != 0,
-						 data, write_access);
-			else {
-				dprintk("ptrace: rejecting access to register "
-					"address 0x%lx\n", addr);
-				return -1;
-			}
-		}
-	} else if (addr < PT_F9+16) {
-		/* scratch state */
-		switch (addr) {
-		      case PT_AR_BSP:
-			/*
-			 * By convention, we use PT_AR_BSP to refer to
-			 * the end of the user-level backing store.
-			 * Use ia64_rse_skip_regs(PT_AR_BSP, -CFM.sof)
-			 * to get the real value of ar.bsp at the time
-			 * the kernel was entered.
-			 *
-			 * Furthermore, when changing the contents of
-			 * PT_AR_BSP (or PT_CFM) while the task is
-			 * blocked in a system call, convert the state
-			 * so that the non-system-call exit
-			 * path is used.  This ensures that the proper
-			 * state will be picked up when resuming
-			 * execution.  However, it *also* means that
-			 * once we write PT_AR_BSP/PT_CFM, it won't be
-			 * possible to modify the syscall arguments of
-			 * the pending system call any longer.  This
-			 * shouldn't be an issue because modifying
-			 * PT_AR_BSP/PT_CFM generally implies that
-			 * we're either abandoning the pending system
-			 * call or that we defer it's re-execution
-			 * (e.g., due to GDB doing an inferior
-			 * function call).
-			 */
-			urbs_end = ia64_get_user_rbs_end(child, pt, &cfm);
-			if (write_access) {
-				if (*data != urbs_end) {
-					if (in_syscall(pt))
-						convert_to_non_syscall(child,
-								       pt,
-								       cfm);
-					/*
-					 * Simulate user-level write
-					 * of ar.bsp:
-					 */
-					pt->loadrs = 0;
-					pt->ar_bspstore = *data;
-				}
-			} else
-				*data = urbs_end;
-			return 0;
-
-		      case PT_CFM:
-			urbs_end = ia64_get_user_rbs_end(child, pt, &cfm);
-			if (write_access) {
-				if (((cfm ^ *data) & PFM_MASK) != 0) {
-					if (in_syscall(pt))
-						convert_to_non_syscall(child,
-								       pt,
-								       cfm);
-					pt->cr_ifs = ((pt->cr_ifs & ~PFM_MASK)
-						      | (*data & PFM_MASK));
-				}
-			} else
-				*data = cfm;
-			return 0;
-
-		      case PT_CR_IPSR:
-			if (write_access) {
-				unsigned long tmp = *data;
-				/* psr.ri==3 is a reserved value: SDM 2:25 */
-				if ((tmp & IA64_PSR_RI) == IA64_PSR_RI)
-					tmp &= ~IA64_PSR_RI;
-				pt->cr_ipsr = ((tmp & IPSR_MASK)
-					       | (pt->cr_ipsr & ~IPSR_MASK));
-			} else
-				*data = (pt->cr_ipsr & IPSR_MASK);
-			return 0;
-
-		      case PT_AR_RSC:
-			if (write_access)
-				pt->ar_rsc = *data | (3 << 2); /* force PL3 */
-			else
-				*data = pt->ar_rsc;
-			return 0;
-
-		      case PT_AR_RNAT:
-			ptr = pt_reg_addr(pt, ar_rnat);
-			break;
-		      case PT_R1:
-			ptr = pt_reg_addr(pt, r1);
-			break;
-		      case PT_R2:  case PT_R3:
-			ptr = pt_reg_addr(pt, r2) + (addr - PT_R2);
-			break;
-		      case PT_R8:  case PT_R9:  case PT_R10: case PT_R11:
-			ptr = pt_reg_addr(pt, r8) + (addr - PT_R8);
-			break;
-		      case PT_R12: case PT_R13:
-			ptr = pt_reg_addr(pt, r12) + (addr - PT_R12);
-			break;
-		      case PT_R14:
-			ptr = pt_reg_addr(pt, r14);
-			break;
-		      case PT_R15:
-			ptr = pt_reg_addr(pt, r15);
-			break;
-		      case PT_R16: case PT_R17: case PT_R18: case PT_R19:
-		      case PT_R20: case PT_R21: case PT_R22: case PT_R23:
-		      case PT_R24: case PT_R25: case PT_R26: case PT_R27:
-		      case PT_R28: case PT_R29: case PT_R30: case PT_R31:
-			ptr = pt_reg_addr(pt, r16) + (addr - PT_R16);
-			break;
-		      case PT_B0:
-			ptr = pt_reg_addr(pt, b0);
-			break;
-		      case PT_B6:
-			ptr = pt_reg_addr(pt, b6);
-			break;
-		      case PT_B7:
-			ptr = pt_reg_addr(pt, b7);
-			break;
-		      case PT_F6:  case PT_F6+8: case PT_F7: case PT_F7+8:
-		      case PT_F8:  case PT_F8+8: case PT_F9: case PT_F9+8:
-			ptr = pt_reg_addr(pt, f6) + (addr - PT_F6);
-			break;
-		      case PT_AR_BSPSTORE:
-			ptr = pt_reg_addr(pt, ar_bspstore);
-			break;
-		      case PT_AR_UNAT:
-			ptr = pt_reg_addr(pt, ar_unat);
-			break;
-		      case PT_AR_PFS:
-			ptr = pt_reg_addr(pt, ar_pfs);
-			break;
-		      case PT_AR_CCV:
-			ptr = pt_reg_addr(pt, ar_ccv);
-			break;
-		      case PT_AR_FPSR:
-			ptr = pt_reg_addr(pt, ar_fpsr);
-			break;
-		      case PT_CR_IIP:
-			ptr = pt_reg_addr(pt, cr_iip);
-			break;
-		      case PT_PR:
-			ptr = pt_reg_addr(pt, pr);
-			break;
-			/* scratch register */
-
-		      default:
-			/* disallow accessing anything else... */
-			dprintk("ptrace: rejecting access to register "
-				"address 0x%lx\n", addr);
-			return -1;
-		}
-	} else if (addr <= PT_AR_SSD) {
-		ptr = pt_reg_addr(pt, ar_csd) + (addr - PT_AR_CSD);
-	} else {
-		/* access debug registers */
-
-		if (addr >= PT_IBR) {
-			regnum = (addr - PT_IBR) >> 3;
-			ptr = &child->thread.ibr[0];
-		} else {
-			regnum = (addr - PT_DBR) >> 3;
-			ptr = &child->thread.dbr[0];
-		}
-
-		if (regnum >= 8) {
-			dprintk("ptrace: rejecting access to register "
-				"address 0x%lx\n", addr);
-			return -1;
-		}
-#ifdef CONFIG_PERFMON
-		/*
-		 * Check if debug registers are used by perfmon. This
-		 * test must be done once we know that we can do the
-		 * operation, i.e. the arguments are all valid, but
-		 * before we start modifying the state.
-		 *
-		 * Perfmon needs to keep a count of how many processes
-		 * are trying to modify the debug registers for system
-		 * wide monitoring sessions.
-		 *
-		 * We also include read access here, because they may
-		 * cause the PMU-installed debug register state
-		 * (dbr[], ibr[]) to be reset. The two arrays are also
-		 * used by perfmon, but we do not use
-		 * IA64_THREAD_DBG_VALID. The registers are restored
-		 * by the PMU context switch code.
-		 */
-		if (pfm_use_debug_registers(child)) return -1;
-#endif
-
-		if (!(child->thread.flags & IA64_THREAD_DBG_VALID)) {
-			child->thread.flags |= IA64_THREAD_DBG_VALID;
-			memset(child->thread.dbr, 0,
-			       sizeof(child->thread.dbr));
-			memset(child->thread.ibr, 0,
-			       sizeof(child->thread.ibr));
-		}
-
-		ptr += regnum;
-
-		if ((regnum & 1) && write_access) {
-			/* don't let the user set kernel-level breakpoints: */
-			*ptr = *data & ~(7UL << 56);
-			return 0;
-		}
-	}
-	if (write_access)
-		*ptr = *data;
-	else
-		*data = *ptr;
-	return 0;
-}
+	      unsigned long *data, int write_access);
 
 static long
 ptrace_getregs (struct task_struct *child, struct pt_all_user_regs __user *ppr)
@@ -1626,3 +1310,892 @@ syscall_trace_leave (long arg0, long arg1, long arg2, long arg3,
 	if (test_thread_flag(TIF_RESTORE_RSE))
 		ia64_sync_krbs();
 }
+
+/* Utrace implementation starts here */
+struct regset_get {
+	void *kbuf;
+	void __user *ubuf;
+};
+
+struct regset_set {
+	const void *kbuf;
+	const void __user *ubuf;
+};
+
+struct regset_getset {
+	struct task_struct *target;
+	const struct user_regset *regset;
+	union {
+		struct regset_get get;
+		struct regset_set set;
+	} u;
+	unsigned int pos;
+	unsigned int count;
+	int ret;
+};
+
+static int
+access_elf_gpreg(struct task_struct *target, struct unw_frame_info *info,
+		unsigned long addr, unsigned long *data, int write_access)
+{
+	struct pt_regs *pt;
+	unsigned long *ptr = NULL;
+	int ret;
+	char nat = 0;
+
+	pt = task_pt_regs(target);
+	switch (addr) {
+	case ELF_GR_OFFSET(1):
+		ptr = &pt->r1;
+		break;
+	case ELF_GR_OFFSET(2):
+	case ELF_GR_OFFSET(3):
+		ptr = (void *)&pt->r2 + (addr - ELF_GR_OFFSET(2));
+		break;
+	case ELF_GR_OFFSET(4) ... ELF_GR_OFFSET(7):
+		if (write_access) {
+			/* read NaT bit first: */
+			unsigned long dummy;
+
+			ret = unw_get_gr(info, addr/8, &dummy, &nat);
+			if (ret < 0)
+				return ret;
+		}
+		return unw_access_gr(info, addr/8, data, &nat, write_access);
+	case ELF_GR_OFFSET(8) ... ELF_GR_OFFSET(11):
+		ptr = (void *)&pt->r8 + addr - ELF_GR_OFFSET(8);
+		break;
+	case ELF_GR_OFFSET(12):
+	case ELF_GR_OFFSET(13):
+		ptr = (void *)&pt->r12 + addr - ELF_GR_OFFSET(12);
+		break;
+	case ELF_GR_OFFSET(14):
+		ptr = &pt->r14;
+		break;
+	case ELF_GR_OFFSET(15):
+		ptr = &pt->r15;
+	}
+	if (write_access)
+		*ptr = *data;
+	else
+		*data = *ptr;
+	return 0;
+}
+
+static int
+access_elf_breg(struct task_struct *target, struct unw_frame_info *info,
+		unsigned long addr, unsigned long *data, int write_access)
+{
+	struct pt_regs *pt;
+	unsigned long *ptr = NULL;
+
+	pt = task_pt_regs(target);
+	switch (addr) {
+	case ELF_BR_OFFSET(0):
+		ptr = &pt->b0;
+		break;
+	case ELF_BR_OFFSET(1) ... ELF_BR_OFFSET(5):
+		return unw_access_br(info, (addr - ELF_BR_OFFSET(0))/8,
+				     data, write_access);
+	case ELF_BR_OFFSET(6):
+		ptr = &pt->b6;
+		break;
+	case ELF_BR_OFFSET(7):
+		ptr = &pt->b7;
+	}
+	if (write_access)
+		*ptr = *data;
+	else
+		*data = *ptr;
+	return 0;
+}
+
+static int
+access_elf_areg(struct task_struct *target, struct unw_frame_info *info,
+		unsigned long addr, unsigned long *data, int write_access)
+{
+	struct pt_regs *pt;
+	unsigned long cfm, urbs_end;
+	unsigned long *ptr = NULL;
+
+	pt = task_pt_regs(target);
+	if (addr >= ELF_AR_RSC_OFFSET && addr <= ELF_AR_SSD_OFFSET) {
+		switch (addr) {
+		case ELF_AR_RSC_OFFSET:
+			/* force PL3 */
+			if (write_access)
+				pt->ar_rsc = *data | (3 << 2);
+			else
+				*data = pt->ar_rsc;
+			return 0;
+		case ELF_AR_BSP_OFFSET:
+			/*
+			 * By convention, we use PT_AR_BSP to refer to
+			 * the end of the user-level backing store.
+			 * Use ia64_rse_skip_regs(PT_AR_BSP, -CFM.sof)
+			 * to get the real value of ar.bsp at the time
+			 * the kernel was entered.
+			 *
+			 * Furthermore, when changing the contents of
+			 * PT_AR_BSP (or PT_CFM) while the task is
+			 * blocked in a system call, convert the state
+			 * so that the non-system-call exit
+			 * path is used.  This ensures that the proper
+			 * state will be picked up when resuming
+			 * execution.  However, it *also* means that
+			 * once we write PT_AR_BSP/PT_CFM, it won't be
+			 * possible to modify the syscall arguments of
+			 * the pending system call any longer.  This
+			 * shouldn't be an issue because modifying
+			 * PT_AR_BSP/PT_CFM generally implies that
+			 * we're either abandoning the pending system
+			 * call or that we defer it's re-execution
+			 * (e.g., due to GDB doing an inferior
+			 * function call).
+			 */
+			urbs_end = ia64_get_user_rbs_end(target, pt, &cfm);
+			if (write_access) {
+				if (*data != urbs_end) {
+					if (in_syscall(pt))
+						convert_to_non_syscall(target,
+								       pt,
+								       cfm);
+					/*
+					 * Simulate user-level write
+					 * of ar.bsp:
+					 */
+					pt->loadrs = 0;
+					pt->ar_bspstore = *data;
+				}
+			} else
+				*data = urbs_end;
+			return 0;
+		case ELF_AR_BSPSTORE_OFFSET:
+			ptr = &pt->ar_bspstore;
+			break;
+		case ELF_AR_RNAT_OFFSET:
+			ptr = &pt->ar_rnat;
+			break;
+		case ELF_AR_CCV_OFFSET:
+			ptr = &pt->ar_ccv;
+			break;
+		case ELF_AR_UNAT_OFFSET:
+			ptr = &pt->ar_unat;
+			break;
+		case ELF_AR_FPSR_OFFSET:
+			ptr = &pt->ar_fpsr;
+			break;
+		case ELF_AR_PFS_OFFSET:
+			ptr = &pt->ar_pfs;
+			break;
+		case ELF_AR_LC_OFFSET:
+			return unw_access_ar(info, UNW_AR_LC, data,
+					     write_access);
+		case ELF_AR_EC_OFFSET:
+			return unw_access_ar(info, UNW_AR_EC, data,
+					     write_access);
+		case ELF_AR_CSD_OFFSET:
+			ptr = &pt->ar_csd;
+			break;
+		case ELF_AR_SSD_OFFSET:
+			ptr = &pt->ar_ssd;
+		}
+	} else if (addr >= ELF_CR_IIP_OFFSET && addr <= ELF_CR_IPSR_OFFSET) {
+		switch (addr) {
+		case ELF_CR_IIP_OFFSET:
+			ptr = &pt->cr_iip;
+			break;
+		case ELF_CFM_OFFSET:
+			urbs_end = ia64_get_user_rbs_end(target, pt, &cfm);
+			if (write_access) {
+				if (((cfm ^ *data) & PFM_MASK) != 0) {
+					if (in_syscall(pt))
+						convert_to_non_syscall(target,
+								       pt,
+								       cfm);
+					pt->cr_ifs = ((pt->cr_ifs & ~PFM_MASK)
+						      | (*data & PFM_MASK));
+				}
+			} else
+				*data = cfm;
+			return 0;
+		case ELF_CR_IPSR_OFFSET:
+			if (write_access) {
+				unsigned long tmp = *data;
+				/* psr.ri==3 is a reserved value: SDM 2:25 */
+				if ((tmp & IA64_PSR_RI) == IA64_PSR_RI)
+					tmp &= ~IA64_PSR_RI;
+				pt->cr_ipsr = ((tmp & IPSR_MASK)
+					       | (pt->cr_ipsr & ~IPSR_MASK));
+			} else
+				*data = (pt->cr_ipsr & IPSR_MASK);
+			return 0;
+		}
+	} else if (addr == ELF_NAT_OFFSET)
+		return access_nat_bits(target, pt, info,
+				       data, write_access);
+	else if (addr == ELF_PR_OFFSET)
+		ptr = &pt->pr;
+	else
+		return -1;
+
+	if (write_access)
+		*ptr = *data;
+	else
+		*data = *ptr;
+
+	return 0;
+}
+
+static int
+access_elf_reg(struct task_struct *target, struct unw_frame_info *info,
+		unsigned long addr, unsigned long *data, int write_access)
+{
+	if (addr >= ELF_GR_OFFSET(1) && addr <= ELF_GR_OFFSET(15))
+		return access_elf_gpreg(target, info, addr, data, write_access);
+	else if (addr >= ELF_BR_OFFSET(0) && addr <= ELF_BR_OFFSET(7))
+		return access_elf_breg(target, info, addr, data, write_access);
+	else
+		return access_elf_areg(target, info, addr, data, write_access);
+}
+
+void do_gpregs_get(struct unw_frame_info *info, void *arg)
+{
+	struct pt_regs *pt;
+	struct regset_getset *dst = arg;
+	elf_greg_t tmp[16];
+	unsigned int i, index, min_copy;
+
+	if (unw_unwind_to_user(info) < 0)
+		return;
+
+	/*
+	 * coredump format:
+	 *      r0-r31
+	 *      NaT bits (for r0-r31; bit N == 1 iff rN is a NaT)
+	 *      predicate registers (p0-p63)
+	 *      b0-b7
+	 *      ip cfm user-mask
+	 *      ar.rsc ar.bsp ar.bspstore ar.rnat
+	 *      ar.ccv ar.unat ar.fpsr ar.pfs ar.lc ar.ec
+	 */
+
+
+	/* Skip r0 */
+	if (dst->count > 0 && dst->pos < ELF_GR_OFFSET(1)) {
+		dst->ret = user_regset_copyout_zero(&dst->pos, &dst->count,
+						      &dst->u.get.kbuf,
+						      &dst->u.get.ubuf,
+						      0, ELF_GR_OFFSET(1));
+		if (dst->ret || dst->count == 0)
+			return;
+	}
+
+	/* gr1 - gr15 */
+	if (dst->count > 0 && dst->pos < ELF_GR_OFFSET(16)) {
+		index = (dst->pos - ELF_GR_OFFSET(1)) / sizeof(elf_greg_t);
+		min_copy = ELF_GR_OFFSET(16) > (dst->pos + dst->count) ?
+			 (dst->pos + dst->count) : ELF_GR_OFFSET(16);
+		for (i = dst->pos; i < min_copy; i += sizeof(elf_greg_t),
+				index++)
+			if (access_elf_reg(dst->target, info, i,
+						&tmp[index], 0) < 0) {
+				dst->ret = -EIO;
+				return;
+			}
+		dst->ret = user_regset_copyout(&dst->pos, &dst->count,
+				&dst->u.get.kbuf, &dst->u.get.ubuf, tmp,
+				ELF_GR_OFFSET(1), ELF_GR_OFFSET(16));
+		if (dst->ret || dst->count == 0)
+			return;
+	}
+
+	/* r16-r31 */
+	if (dst->count > 0 && dst->pos < ELF_NAT_OFFSET) {
+		pt = task_pt_regs(dst->target);
+		dst->ret = user_regset_copyout(&dst->pos, &dst->count,
+				&dst->u.get.kbuf, &dst->u.get.ubuf, &pt->r16,
+				ELF_GR_OFFSET(16), ELF_NAT_OFFSET);
+		if (dst->ret || dst->count == 0)
+			return;
+	}
+
+	/* nat, pr, b0 - b7 */
+	if (dst->count > 0 && dst->pos < ELF_CR_IIP_OFFSET) {
+		index = (dst->pos - ELF_NAT_OFFSET) / sizeof(elf_greg_t);
+		min_copy = ELF_CR_IIP_OFFSET > (dst->pos + dst->count) ?
+			 (dst->pos + dst->count) : ELF_CR_IIP_OFFSET;
+		for (i = dst->pos; i < min_copy; i += sizeof(elf_greg_t),
+				index++)
+			if (access_elf_reg(dst->target, info, i,
+						&tmp[index], 0) < 0) {
+				dst->ret = -EIO;
+				return;
+			}
+		dst->ret = user_regset_copyout(&dst->pos, &dst->count,
+				&dst->u.get.kbuf, &dst->u.get.ubuf, tmp,
+				ELF_NAT_OFFSET, ELF_CR_IIP_OFFSET);
+		if (dst->ret || dst->count == 0)
+			return;
+	}
+
+	/* ip cfm psr ar.rsc ar.bsp ar.bspstore ar.rnat
+	 * ar.ccv ar.unat ar.fpsr ar.pfs ar.lc ar.ec ar.csd ar.ssd
+	 */
+	if (dst->count > 0 && dst->pos < (ELF_AR_END_OFFSET)) {
+		index = (dst->pos - ELF_CR_IIP_OFFSET) / sizeof(elf_greg_t);
+		min_copy = ELF_AR_END_OFFSET > (dst->pos + dst->count) ?
+			 (dst->pos + dst->count) : ELF_AR_END_OFFSET;
+		for (i = dst->pos; i < min_copy; i += sizeof(elf_greg_t),
+				index++)
+			if (access_elf_reg(dst->target, info, i,
+						&tmp[index], 0) < 0) {
+				dst->ret = -EIO;
+				return;
+			}
+		dst->ret = user_regset_copyout(&dst->pos, &dst->count,
+				&dst->u.get.kbuf, &dst->u.get.ubuf, tmp,
+				ELF_CR_IIP_OFFSET, ELF_AR_END_OFFSET);
+	}
+}
+
+void do_gpregs_set(struct unw_frame_info *info, void *arg)
+{
+	struct pt_regs *pt;
+	struct regset_getset *dst = arg;
+	elf_greg_t tmp[16];
+	unsigned int i, index;
+
+	if (unw_unwind_to_user(info) < 0)
+		return;
+
+	/* Skip r0 */
+	if (dst->count > 0 && dst->pos < ELF_GR_OFFSET(1)) {
+		dst->ret = user_regset_copyin_ignore(&dst->pos, &dst->count,
+						       &dst->u.set.kbuf,
+						       &dst->u.set.ubuf,
+						       0, ELF_GR_OFFSET(1));
+		if (dst->ret || dst->count == 0)
+			return;
+	}
+
+	/* gr1-gr15 */
+	if (dst->count > 0 && dst->pos < ELF_GR_OFFSET(16)) {
+		i = dst->pos;
+		index = (dst->pos - ELF_GR_OFFSET(1)) / sizeof(elf_greg_t);
+		dst->ret = user_regset_copyin(&dst->pos, &dst->count,
+				&dst->u.set.kbuf, &dst->u.set.ubuf, tmp,
+				ELF_GR_OFFSET(1), ELF_GR_OFFSET(16));
+		if (dst->ret)
+			return;
+		for ( ; i < dst->pos; i += sizeof(elf_greg_t), index++)
+			if (access_elf_reg(dst->target, info, i,
+						&tmp[index], 1) < 0) {
+				dst->ret = -EIO;
+				return;
+			}
+		if (dst->count == 0)
+			return;
+	}
+
+	/* gr16-gr31 */
+	if (dst->count > 0 && dst->pos < ELF_NAT_OFFSET) {
+		pt = task_pt_regs(dst->target);
+		dst->ret = user_regset_copyin(&dst->pos, &dst->count,
+				&dst->u.set.kbuf, &dst->u.set.ubuf, &pt->r16,
+				ELF_GR_OFFSET(16), ELF_NAT_OFFSET);
+		if (dst->ret || dst->count == 0)
+			return;
+	}
+
+	/* nat, pr, b0 - b7 */
+	if (dst->count > 0 && dst->pos < ELF_CR_IIP_OFFSET) {
+		i = dst->pos;
+		index = (dst->pos - ELF_NAT_OFFSET) / sizeof(elf_greg_t);
+		dst->ret = user_regset_copyin(&dst->pos, &dst->count,
+				&dst->u.set.kbuf, &dst->u.set.ubuf, tmp,
+				ELF_NAT_OFFSET, ELF_CR_IIP_OFFSET);
+		if (dst->ret)
+			return;
+		for (; i < dst->pos; i += sizeof(elf_greg_t), index++)
+			if (access_elf_reg(dst->target, info, i,
+						&tmp[index], 1) < 0) {
+				dst->ret = -EIO;
+				return;
+			}
+		if (dst->count == 0)
+			return;
+	}
+
+	/* ip cfm psr ar.rsc ar.bsp ar.bspstore ar.rnat
+	 * ar.ccv ar.unat ar.fpsr ar.pfs ar.lc ar.ec ar.csd ar.ssd
+	 */
+	if (dst->count > 0 && dst->pos < (ELF_AR_END_OFFSET)) {
+		i = dst->pos;
+		index = (dst->pos - ELF_CR_IIP_OFFSET) / sizeof(elf_greg_t);
+		dst->ret = user_regset_copyin(&dst->pos, &dst->count,
+				&dst->u.set.kbuf, &dst->u.set.ubuf, tmp,
+				ELF_CR_IIP_OFFSET, ELF_AR_END_OFFSET);
+		if (dst->ret)
+			return;
+		for ( ; i < dst->pos; i += sizeof(elf_greg_t), index++)
+			if (access_elf_reg(dst->target, info, i,
+						&tmp[index], 1) < 0) {
+				dst->ret = -EIO;
+				return;
+			}
+	}
+}
+
+#define ELF_FP_OFFSET(i)	(i * sizeof(elf_fpreg_t))
+
+void do_fpregs_get(struct unw_frame_info *info, void *arg)
+{
+	struct regset_getset *dst = arg;
+	struct task_struct *task = dst->target;
+	elf_fpreg_t tmp[30];
+	int index, min_copy, i;
+
+	if (unw_unwind_to_user(info) < 0)
+		return;
+
+	/* Skip pos 0 and 1 */
+	if (dst->count > 0 && dst->pos < ELF_FP_OFFSET(2)) {
+		dst->ret = user_regset_copyout_zero(&dst->pos, &dst->count,
+						      &dst->u.get.kbuf,
+						      &dst->u.get.ubuf,
+						      0, ELF_FP_OFFSET(2));
+		if (dst->count == 0 || dst->ret)
+			return;
+	}
+
+	/* fr2-fr31 */
+	if (dst->count > 0 && dst->pos < ELF_FP_OFFSET(32)) {
+		index = (dst->pos - ELF_FP_OFFSET(2)) / sizeof(elf_fpreg_t);
+
+		min_copy = min(((unsigned int)ELF_FP_OFFSET(32)),
+				dst->pos + dst->count);
+		for (i = dst->pos; i < min_copy; i += sizeof(elf_fpreg_t),
+				index++)
+			if (unw_get_fr(info, i / sizeof(elf_fpreg_t),
+					 &tmp[index])) {
+				dst->ret = -EIO;
+				return;
+			}
+		dst->ret = user_regset_copyout(&dst->pos, &dst->count,
+				&dst->u.get.kbuf, &dst->u.get.ubuf, tmp,
+				ELF_FP_OFFSET(2), ELF_FP_OFFSET(32));
+		if (dst->count == 0 || dst->ret)
+			return;
+	}
+
+	/* fph */
+	if (dst->count > 0) {
+		ia64_flush_fph(dst->target);
+		if (task->thread.flags & IA64_THREAD_FPH_VALID)
+			dst->ret = user_regset_copyout(
+				&dst->pos, &dst->count,
+				&dst->u.get.kbuf, &dst->u.get.ubuf,
+				&dst->target->thread.fph,
+				ELF_FP_OFFSET(32), -1);
+		else
+			/* Zero fill instead.  */
+			dst->ret = user_regset_copyout_zero(
+				&dst->pos, &dst->count,
+				&dst->u.get.kbuf, &dst->u.get.ubuf,
+				ELF_FP_OFFSET(32), -1);
+	}
+}
+
+void do_fpregs_set(struct unw_frame_info *info, void *arg)
+{
+	struct regset_getset *dst = arg;
+	elf_fpreg_t fpreg, tmp[30];
+	int index, start, end;
+
+	if (unw_unwind_to_user(info) < 0)
+		return;
+
+	/* Skip pos 0 and 1 */
+	if (dst->count > 0 && dst->pos < ELF_FP_OFFSET(2)) {
+		dst->ret = user_regset_copyin_ignore(&dst->pos, &dst->count,
+						       &dst->u.set.kbuf,
+						       &dst->u.set.ubuf,
+						       0, ELF_FP_OFFSET(2));
+		if (dst->count == 0 || dst->ret)
+			return;
+	}
+
+	/* fr2-fr31 */
+	if (dst->count > 0 && dst->pos < ELF_FP_OFFSET(32)) {
+		start = dst->pos;
+		end = min(((unsigned int)ELF_FP_OFFSET(32)),
+			 dst->pos + dst->count);
+		dst->ret = user_regset_copyin(&dst->pos, &dst->count,
+				&dst->u.set.kbuf, &dst->u.set.ubuf, tmp,
+				ELF_FP_OFFSET(2), ELF_FP_OFFSET(32));
+		if (dst->ret)
+			return;
+
+		if (start & 0xF) { /* only write high part */
+			if (unw_get_fr(info, start / sizeof(elf_fpreg_t),
+					 &fpreg)) {
+				dst->ret = -EIO;
+				return;
+			}
+			tmp[start / sizeof(elf_fpreg_t) - 2].u.bits[0]
+				= fpreg.u.bits[0];
+			start &= ~0xFUL;
+		}
+		if (end & 0xF) { /* only write low part */
+			if (unw_get_fr(info, end / sizeof(elf_fpreg_t),
+					&fpreg)) {
+				dst->ret = -EIO;
+				return;
+			}
+			tmp[end / sizeof(elf_fpreg_t) - 2].u.bits[1]
+				= fpreg.u.bits[1];
+			end = (end + 0xF) & ~0xFUL;
+		}
+
+		for ( ;	start < end ; start += sizeof(elf_fpreg_t)) {
+			index = start / sizeof(elf_fpreg_t);
+			if (unw_set_fr(info, index, tmp[index - 2])) {
+				dst->ret = -EIO;
+				return;
+			}
+		}
+		if (dst->ret || dst->count == 0)
+			return;
+	}
+
+	/* fph */
+	if (dst->count > 0 && dst->pos < ELF_FP_OFFSET(128)) {
+		ia64_sync_fph(dst->target);
+		dst->ret = user_regset_copyin(&dst->pos, &dst->count,
+						&dst->u.set.kbuf,
+						&dst->u.set.ubuf,
+						&dst->target->thread.fph,
+						ELF_FP_OFFSET(32), -1);
+	}
+}
+
+static int
+do_regset_call(void (*call)(struct unw_frame_info *, void *),
+	       struct task_struct *target,
+	       const struct user_regset *regset,
+	       unsigned int pos, unsigned int count,
+	       const void *kbuf, const void __user *ubuf)
+{
+	struct regset_getset info = { .target = target, .regset = regset,
+				 .pos = pos, .count = count,
+				 .u.set = { .kbuf = kbuf, .ubuf = ubuf },
+				 .ret = 0 };
+
+	if (target == current)
+		unw_init_running(call, &info);
+	else {
+		struct unw_frame_info ufi;
+		memset(&ufi, 0, sizeof(ufi));
+		unw_init_from_blocked_task(&ufi, target);
+		(*call)(&ufi, &info);
+	}
+
+	return info.ret;
+}
+
+static int
+gpregs_get(struct task_struct *target,
+	   const struct user_regset *regset,
+	   unsigned int pos, unsigned int count,
+	   void *kbuf, void __user *ubuf)
+{
+	return do_regset_call(do_gpregs_get, target, regset, pos, count,
+		kbuf, ubuf);
+}
+
+static int gpregs_set(struct task_struct *target,
+		const struct user_regset *regset,
+		unsigned int pos, unsigned int count,
+		const void *kbuf, const void __user *ubuf)
+{
+	return do_regset_call(do_gpregs_set, target, regset, pos, count,
+		kbuf, ubuf);
+}
+
+static void do_gpregs_writeback(struct unw_frame_info *info, void *arg)
+{
+	do_sync_rbs(info, ia64_sync_user_rbs);
+}
+
+/*
+ * This is called to write back the register backing store.
+ * ptrace does this before it stops, so that a tracer reading the user
+ * memory after the thread stops will get the current register data.
+ */
+static int
+gpregs_writeback(struct task_struct *target,
+		 const struct user_regset *regset,
+		 int now)
+{
+	if (test_and_set_tsk_thread_flag(target, TIF_RESTORE_RSE))
+		return 0;
+	tsk_set_notify_resume(target);
+	return do_regset_call(do_gpregs_writeback, target, regset, 0, 0,
+		NULL, NULL);
+}
+
+static int
+fpregs_active(struct task_struct *target, const struct user_regset *regset)
+{
+	return (target->thread.flags & IA64_THREAD_FPH_VALID) ? 128 : 32;
+}
+
+static int fpregs_get(struct task_struct *target,
+		const struct user_regset *regset,
+		unsigned int pos, unsigned int count,
+		void *kbuf, void __user *ubuf)
+{
+	return do_regset_call(do_fpregs_get, target, regset, pos, count,
+		kbuf, ubuf);
+}
+
+static int fpregs_set(struct task_struct *target,
+		const struct user_regset *regset,
+		unsigned int pos, unsigned int count,
+		const void *kbuf, const void __user *ubuf)
+{
+	return do_regset_call(do_fpregs_set, target, regset, pos, count,
+		kbuf, ubuf);
+}
+
+static int
+access_uarea(struct task_struct *child, unsigned long addr,
+	      unsigned long *data, int write_access)
+{
+	unsigned int pos = -1; /* an invalid value */
+	int ret;
+	unsigned long *ptr, regnum;
+
+	if ((addr & 0x7) != 0) {
+		dprintk("ptrace: unaligned register address 0x%lx\n", addr);
+		return -1;
+	}
+	if ((addr >= PT_NAT_BITS + 8 && addr < PT_F2) ||
+		(addr >= PT_R7 + 8 && addr < PT_B1) ||
+		(addr >= PT_AR_LC + 8 && addr < PT_CR_IPSR) ||
+		(addr >= PT_AR_SSD + 8 && addr < PT_DBR)) {
+		dprintk("ptrace: rejecting access to register "
+					"address 0x%lx\n", addr);
+		return -1;
+	}
+
+	switch (addr) {
+	case PT_F32 ... (PT_F127 + 15):
+		pos = addr - PT_F32 + ELF_FP_OFFSET(32);
+		break;
+	case PT_F2 ... (PT_F5 + 15):
+		pos = addr - PT_F2 + ELF_FP_OFFSET(2);
+		break;
+	case PT_F10 ... (PT_F31 + 15):
+		pos = addr - PT_F10 + ELF_FP_OFFSET(10);
+		break;
+	case PT_F6 ... (PT_F9 + 15):
+		pos = addr - PT_F6 + ELF_FP_OFFSET(6);
+		break;
+	}
+
+	if (pos != -1) {
+		if (write_access)
+			ret = fpregs_set(child, NULL, pos,
+				sizeof(unsigned long), data, NULL);
+		else
+			ret = fpregs_get(child, NULL, pos,
+				sizeof(unsigned long), data, NULL);
+		if (ret != 0)
+			return -1;
+		return 0;
+	}
+
+	switch (addr) {
+	case PT_NAT_BITS:
+		pos = ELF_NAT_OFFSET;
+		break;
+	case PT_R4 ... PT_R7:
+		pos = addr - PT_R4 + ELF_GR_OFFSET(4);
+		break;
+	case PT_B1 ... PT_B5:
+		pos = addr - PT_B1 + ELF_BR_OFFSET(1);
+		break;
+	case PT_AR_EC:
+		pos = ELF_AR_EC_OFFSET;
+		break;
+	case PT_AR_LC:
+		pos = ELF_AR_LC_OFFSET;
+		break;
+	case PT_CR_IPSR:
+		pos = ELF_CR_IPSR_OFFSET;
+		break;
+	case PT_CR_IIP:
+		pos = ELF_CR_IIP_OFFSET;
+		break;
+	case PT_CFM:
+		pos = ELF_CFM_OFFSET;
+		break;
+	case PT_AR_UNAT:
+		pos = ELF_AR_UNAT_OFFSET;
+		break;
+	case PT_AR_PFS:
+		pos = ELF_AR_PFS_OFFSET;
+		break;
+	case PT_AR_RSC:
+		pos = ELF_AR_RSC_OFFSET;
+		break;
+	case PT_AR_RNAT:
+		pos = ELF_AR_RNAT_OFFSET;
+		break;
+	case PT_AR_BSPSTORE:
+		pos = ELF_AR_BSPSTORE_OFFSET;
+		break;
+	case PT_PR:
+		pos = ELF_PR_OFFSET;
+		break;
+	case PT_B6:
+		pos = ELF_BR_OFFSET(6);
+		break;
+	case PT_AR_BSP:
+		pos = ELF_AR_BSP_OFFSET;
+		break;
+	case PT_R1 ... PT_R3:
+		pos = addr - PT_R1 + ELF_GR_OFFSET(1);
+		break;
+	case PT_R12 ... PT_R15:
+		pos = addr - PT_R12 + ELF_GR_OFFSET(12);
+		break;
+	case PT_R8 ... PT_R11:
+		pos = addr - PT_R8 + ELF_GR_OFFSET(8);
+		break;
+	case PT_R16 ... PT_R31:
+		pos = addr - PT_R16 + ELF_GR_OFFSET(16);
+		break;
+	case PT_AR_CCV:
+		pos = ELF_AR_CCV_OFFSET;
+		break;
+	case PT_AR_FPSR:
+		pos = ELF_AR_FPSR_OFFSET;
+		break;
+	case PT_B0:
+		pos = ELF_BR_OFFSET(0);
+		break;
+	case PT_B7:
+		pos = ELF_BR_OFFSET(7);
+		break;
+	case PT_AR_CSD:
+		pos = ELF_AR_CSD_OFFSET;
+		break;
+	case PT_AR_SSD:
+		pos = ELF_AR_SSD_OFFSET;
+		break;
+	}
+
+	if (pos != -1) {
+		if (write_access)
+			ret = gpregs_set(child, NULL, pos,
+				sizeof(unsigned long), data, NULL);
+		else
+			ret = gpregs_get(child, NULL, pos,
+				sizeof(unsigned long), data, NULL);
+		if (ret != 0)
+			return -1;
+		return 0;
+	}
+
+	/* access debug registers */
+	if (addr >= PT_IBR) {
+		regnum = (addr - PT_IBR) >> 3;
+		ptr = &child->thread.ibr[0];
+	} else {
+		regnum = (addr - PT_DBR) >> 3;
+		ptr = &child->thread.dbr[0];
+	}
+
+	if (regnum >= 8) {
+		dprintk("ptrace: rejecting access to register "
+				"address 0x%lx\n", addr);
+		return -1;
+	}
+#ifdef CONFIG_PERFMON
+	/*
+	 * Check if debug registers are used by perfmon. This
+	 * test must be done once we know that we can do the
+	 * operation, i.e. the arguments are all valid, but
+	 * before we start modifying the state.
+	 *
+	 * Perfmon needs to keep a count of how many processes
+	 * are trying to modify the debug registers for system
+	 * wide monitoring sessions.
+	 *
+	 * We also include read access here, because they may
+	 * cause the PMU-installed debug register state
+	 * (dbr[], ibr[]) to be reset. The two arrays are also
+	 * used by perfmon, but we do not use
+	 * IA64_THREAD_DBG_VALID. The registers are restored
+	 * by the PMU context switch code.
+	 */
+	if (pfm_use_debug_registers(child))
+		return -1;
+#endif
+
+	if (!(child->thread.flags & IA64_THREAD_DBG_VALID)) {
+		child->thread.flags |= IA64_THREAD_DBG_VALID;
+		memset(child->thread.dbr, 0,
+				sizeof(child->thread.dbr));
+		memset(child->thread.ibr, 0,
+				sizeof(child->thread.ibr));
+	}
+
+	ptr += regnum;
+
+	if ((regnum & 1) && write_access) {
+		/* don't let the user set kernel-level breakpoints: */
+		*ptr = *data & ~(7UL << 56);
+		return 0;
+	}
+	if (write_access)
+		*ptr = *data;
+	else
+		*data = *ptr;
+	return 0;
+}
+
+static const struct user_regset native_regsets[] = {
+	{
+		.core_note_type = NT_PRSTATUS,
+		.n = ELF_NGREG,
+		.size = sizeof(elf_greg_t), .align = sizeof(elf_greg_t),
+		.get = gpregs_get, .set = gpregs_set,
+		.writeback = gpregs_writeback
+	},
+	{
+		.core_note_type = NT_PRFPREG,
+		.n = ELF_NFPREG,
+		.size = sizeof(elf_fpreg_t), .align = sizeof(elf_fpreg_t),
+		.get = fpregs_get, .set = fpregs_set, .active = fpregs_active
+	},
+};
+
+static const struct user_regset_view user_ia64_view = {
+	.name = "ia64",
+	.e_machine = EM_IA_64,
+	.regsets = native_regsets, .n = ARRAY_SIZE(native_regsets)
+};
+
+const struct user_regset_view *task_user_regset_view(struct task_struct *tsk)
+{
+#ifdef CONFIG_IA32_SUPPORT
+	extern const struct user_regset_view user_ia32_view;
+	if (IS_IA32_PROCESS(task_pt_regs(tsk)))
+		return &user_ia32_view;
+#endif
+	return &user_ia64_view;
+}