add idl4k kernel firmware version 1.13.0.105

kernel/arch/um/sys-x86_64/Makefile

@@ -0,0 +1,25 @@
+#
+# Copyright 2003 PathScale, Inc.
+#
+# Licensed under the GPL
+#
+
+obj-y = bug.o bugs.o delay.o fault.o ldt.o mem.o ptrace.o ptrace_user.o \
+	setjmp.o signal.o stub.o stub_segv.o syscalls.o syscall_table.o \
+	sysrq.o ksyms.o tls.o
+
+subarch-obj-y = lib/csum-partial_64.o lib/memcpy_64.o lib/thunk_64.o \
+		lib/rwsem_64.o
+subarch-obj-$(CONFIG_MODULES) += kernel/module.o
+
+ldt-y = ../sys-i386/ldt.o
+
+USER_OBJS := ptrace_user.o
+
+USER_OBJS += user-offsets.s
+extra-y += user-offsets.s
+
+UNPROFILE_OBJS := stub_segv.o
+CFLAGS_stub_segv.o := $(CFLAGS_NO_HARDENING)
+
+include arch/um/scripts/Makefile.rules

kernel/arch/um/sys-x86_64/asm/archparam.h

@@ -0,0 +1,16 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_ARCHPARAM_X86_64_H
+#define __UM_ARCHPARAM_X86_64_H
+
+
+/* No user-accessible fixmap addresses, i.e. vsyscall */
+#define FIXADDR_USER_START	0
+#define FIXADDR_USER_END	0
+
+#endif
+

kernel/arch/um/sys-x86_64/asm/elf.h

@@ -0,0 +1,119 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ *
+ * Licensed under the GPL
+ */
+#ifndef __UM_ELF_X86_64_H
+#define __UM_ELF_X86_64_H
+
+#include <asm/user.h>
+#include "skas.h"
+
+/* x86-64 relocation types, taken from asm-x86_64/elf.h */
+#define R_X86_64_NONE		0	/* No reloc */
+#define R_X86_64_64		1	/* Direct 64 bit  */
+#define R_X86_64_PC32		2	/* PC relative 32 bit signed */
+#define R_X86_64_GOT32		3	/* 32 bit GOT entry */
+#define R_X86_64_PLT32		4	/* 32 bit PLT address */
+#define R_X86_64_COPY		5	/* Copy symbol at runtime */
+#define R_X86_64_GLOB_DAT	6	/* Create GOT entry */
+#define R_X86_64_JUMP_SLOT	7	/* Create PLT entry */
+#define R_X86_64_RELATIVE	8	/* Adjust by program base */
+#define R_X86_64_GOTPCREL	9	/* 32 bit signed pc relative
+					   offset to GOT */
+#define R_X86_64_32		10	/* Direct 32 bit zero extended */
+#define R_X86_64_32S		11	/* Direct 32 bit sign extended */
+#define R_X86_64_16		12	/* Direct 16 bit zero extended */
+#define R_X86_64_PC16		13	/* 16 bit sign extended pc relative */
+#define R_X86_64_8		14	/* Direct 8 bit sign extended  */
+#define R_X86_64_PC8		15	/* 8 bit sign extended pc relative */
+
+#define R_X86_64_NUM		16
+
+typedef unsigned long elf_greg_t;
+
+#define ELF_NGREG (sizeof (struct user_regs_struct) / sizeof(elf_greg_t))
+typedef elf_greg_t elf_gregset_t[ELF_NGREG];
+
+typedef struct user_i387_struct elf_fpregset_t;
+
+/*
+ * This is used to ensure we don't load something for the wrong architecture.
+ */
+#define elf_check_arch(x) \
+	((x)->e_machine == EM_X86_64)
+
+#define ELF_CLASS	ELFCLASS64
+#define ELF_DATA        ELFDATA2LSB
+#define ELF_ARCH        EM_X86_64
+
+#define ELF_PLAT_INIT(regs, load_addr)    do { \
+	PT_REGS_RBX(regs) = 0; \
+	PT_REGS_RCX(regs) = 0; \
+	PT_REGS_RDX(regs) = 0; \
+	PT_REGS_RSI(regs) = 0; \
+	PT_REGS_RDI(regs) = 0; \
+	PT_REGS_RBP(regs) = 0; \
+	PT_REGS_RAX(regs) = 0; \
+	PT_REGS_R8(regs) = 0; \
+	PT_REGS_R9(regs) = 0; \
+	PT_REGS_R10(regs) = 0; \
+	PT_REGS_R11(regs) = 0; \
+	PT_REGS_R12(regs) = 0; \
+	PT_REGS_R13(regs) = 0; \
+	PT_REGS_R14(regs) = 0; \
+	PT_REGS_R15(regs) = 0; \
+} while (0)
+
+#define ELF_CORE_COPY_REGS(pr_reg, _regs)		\
+	(pr_reg)[0] = (_regs)->regs.gp[0];			\
+	(pr_reg)[1] = (_regs)->regs.gp[1];			\
+	(pr_reg)[2] = (_regs)->regs.gp[2];			\
+	(pr_reg)[3] = (_regs)->regs.gp[3];			\
+	(pr_reg)[4] = (_regs)->regs.gp[4];			\
+	(pr_reg)[5] = (_regs)->regs.gp[5];			\
+	(pr_reg)[6] = (_regs)->regs.gp[6];			\
+	(pr_reg)[7] = (_regs)->regs.gp[7];			\
+	(pr_reg)[8] = (_regs)->regs.gp[8];			\
+	(pr_reg)[9] = (_regs)->regs.gp[9];			\
+	(pr_reg)[10] = (_regs)->regs.gp[10];			\
+	(pr_reg)[11] = (_regs)->regs.gp[11];			\
+	(pr_reg)[12] = (_regs)->regs.gp[12];			\
+	(pr_reg)[13] = (_regs)->regs.gp[13];			\
+	(pr_reg)[14] = (_regs)->regs.gp[14];			\
+	(pr_reg)[15] = (_regs)->regs.gp[15];			\
+	(pr_reg)[16] = (_regs)->regs.gp[16];			\
+	(pr_reg)[17] = (_regs)->regs.gp[17];			\
+	(pr_reg)[18] = (_regs)->regs.gp[18];			\
+	(pr_reg)[19] = (_regs)->regs.gp[19];			\
+	(pr_reg)[20] = (_regs)->regs.gp[20];			\
+	(pr_reg)[21] = current->thread.arch.fs;			\
+	(pr_reg)[22] = 0;					\
+	(pr_reg)[23] = 0;					\
+	(pr_reg)[24] = 0;					\
+	(pr_reg)[25] = 0;					\
+	(pr_reg)[26] = 0;
+
+extern int elf_core_copy_fpregs(struct task_struct *t, elf_fpregset_t *fpu);
+
+#define ELF_CORE_COPY_FPREGS(t, fpu) elf_core_copy_fpregs(t, fpu)
+
+#ifdef TIF_IA32 /* XXX */
+#error XXX, indeed
+        clear_thread_flag(TIF_IA32);
+#endif
+
+#define USE_ELF_CORE_DUMP
+#define ELF_EXEC_PAGESIZE 4096
+
+#define ELF_ET_DYN_BASE (2 * TASK_SIZE / 3)
+
+extern long elf_aux_hwcap;
+#define ELF_HWCAP (elf_aux_hwcap)
+
+#define ELF_PLATFORM "x86_64"
+
+#define SET_PERSONALITY(ex) do ; while(0)
+
+#endif

kernel/arch/um/sys-x86_64/asm/module.h

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_MODULE_X86_64_H
+#define __UM_MODULE_X86_64_H
+
+/* UML is simple */
+struct mod_arch_specific
+{
+};
+
+#define Elf_Shdr Elf64_Shdr
+#define Elf_Sym Elf64_Sym
+#define Elf_Ehdr Elf64_Ehdr
+
+#endif
+

kernel/arch/um/sys-x86_64/asm/processor.h

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PROCESSOR_X86_64_H
+#define __UM_PROCESSOR_X86_64_H
+
+/* include faultinfo structure */
+#include "sysdep/faultinfo.h"
+
+struct arch_thread {
+        unsigned long debugregs[8];
+        int debugregs_seq;
+        unsigned long fs;
+        struct faultinfo faultinfo;
+};
+
+/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
+static inline void rep_nop(void)
+{
+	__asm__ __volatile__("rep;nop": : :"memory");
+}
+
+#define cpu_relax()   rep_nop()
+
+#define INIT_ARCH_THREAD { .debugregs  		= { [ 0 ... 7 ] = 0 }, \
+			   .debugregs_seq	= 0, \
+			   .fs			= 0, \
+			   .faultinfo		= { 0, 0, 0 } }
+
+static inline void arch_flush_thread(struct arch_thread *thread)
+{
+}
+
+static inline void arch_copy_thread(struct arch_thread *from,
+                                    struct arch_thread *to)
+{
+	to->fs = from->fs;
+}
+
+#include <asm/user.h>
+
+#define current_text_addr() \
+	({ void *pc; __asm__("movq $1f,%0\n1:":"=g" (pc)); pc; })
+
+#define ARCH_IS_STACKGROW(address) \
+        (address + 128 >= UPT_SP(&current->thread.regs.regs))
+
+#define KSTK_EIP(tsk) KSTK_REG(tsk, RIP)
+#define KSTK_ESP(tsk) KSTK_REG(tsk, RSP)
+
+#include "asm/processor-generic.h"
+
+#endif

kernel/arch/um/sys-x86_64/asm/ptrace.h

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_PTRACE_X86_64_H
+#define __UM_PTRACE_X86_64_H
+
+#include "linux/compiler.h"
+#include "asm/errno.h"
+
+#define __FRAME_OFFSETS /* Needed to get the R* macros */
+#include "asm/ptrace-generic.h"
+
+#define HOST_AUDIT_ARCH AUDIT_ARCH_X86_64
+
+#define PT_REGS_RBX(r) UPT_RBX(&(r)->regs)
+#define PT_REGS_RCX(r) UPT_RCX(&(r)->regs)
+#define PT_REGS_RDX(r) UPT_RDX(&(r)->regs)
+#define PT_REGS_RSI(r) UPT_RSI(&(r)->regs)
+#define PT_REGS_RDI(r) UPT_RDI(&(r)->regs)
+#define PT_REGS_RBP(r) UPT_RBP(&(r)->regs)
+#define PT_REGS_RAX(r) UPT_RAX(&(r)->regs)
+#define PT_REGS_R8(r) UPT_R8(&(r)->regs)
+#define PT_REGS_R9(r) UPT_R9(&(r)->regs)
+#define PT_REGS_R10(r) UPT_R10(&(r)->regs)
+#define PT_REGS_R11(r) UPT_R11(&(r)->regs)
+#define PT_REGS_R12(r) UPT_R12(&(r)->regs)
+#define PT_REGS_R13(r) UPT_R13(&(r)->regs)
+#define PT_REGS_R14(r) UPT_R14(&(r)->regs)
+#define PT_REGS_R15(r) UPT_R15(&(r)->regs)
+
+#define PT_REGS_FS(r) UPT_FS(&(r)->regs)
+#define PT_REGS_GS(r) UPT_GS(&(r)->regs)
+#define PT_REGS_DS(r) UPT_DS(&(r)->regs)
+#define PT_REGS_ES(r) UPT_ES(&(r)->regs)
+#define PT_REGS_SS(r) UPT_SS(&(r)->regs)
+#define PT_REGS_CS(r) UPT_CS(&(r)->regs)
+
+#define PT_REGS_ORIG_RAX(r) UPT_ORIG_RAX(&(r)->regs)
+#define PT_REGS_RIP(r) UPT_IP(&(r)->regs)
+#define PT_REGS_RSP(r) UPT_SP(&(r)->regs)
+
+#define PT_REGS_EFLAGS(r) UPT_EFLAGS(&(r)->regs)
+
+/* XXX */
+#define user_mode(r) UPT_IS_USER(&(r)->regs)
+#define PT_REGS_ORIG_SYSCALL(r) PT_REGS_RAX(r)
+#define PT_REGS_SYSCALL_RET(r) PT_REGS_RAX(r)
+
+#define PT_FIX_EXEC_STACK(sp) do ; while(0)
+
+#define profile_pc(regs) PT_REGS_IP(regs)
+
+struct user_desc;
+
+static inline int ptrace_get_thread_area(struct task_struct *child, int idx,
+                                         struct user_desc __user *user_desc)
+{
+        return -ENOSYS;
+}
+
+static inline int ptrace_set_thread_area(struct task_struct *child, int idx,
+                                         struct user_desc __user *user_desc)
+{
+        return -ENOSYS;
+}
+
+extern long arch_prctl(struct task_struct *task, int code,
+		       unsigned long __user *addr);
+#endif

kernel/arch/um/sys-x86_64/bug.c

@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2006 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL V2
+ */
+
+#include <linux/uaccess.h>
+
+/*
+ * Mostly copied from i386/x86_86 - eliminated the eip < PAGE_OFFSET because
+ * that's not relevant in skas mode.
+ */
+
+int is_valid_bugaddr(unsigned long eip)
+{
+	unsigned short ud2;
+
+	if (probe_kernel_address((unsigned short __user *)eip, ud2))
+		return 0;
+
+	return ud2 == 0x0b0f;
+}

kernel/arch/um/sys-x86_64/bugs.c

@@ -0,0 +1,15 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#include "sysdep/ptrace.h"
+
+void arch_check_bugs(void)
+{
+}
+
+void arch_examine_signal(int sig, struct uml_pt_regs *regs)
+{
+}

kernel/arch/um/sys-x86_64/delay.c

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ * Copied from arch/x86_64
+ *
+ * Licensed under the GPL
+ */
+
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <asm/processor.h>
+#include <asm/param.h>
+
+void __delay(unsigned long loops)
+{
+	unsigned long i;
+
+        for(i = 0; i < loops; i++)
+                cpu_relax();
+}
+
+void __udelay(unsigned long usecs)
+{
+	unsigned long i, n;
+
+	n = (loops_per_jiffy * HZ * usecs) / MILLION;
+        for(i=0;i<n;i++)
+                cpu_relax();
+}
+
+EXPORT_SYMBOL(__udelay);

kernel/arch/um/sys-x86_64/fault.c

@@ -0,0 +1,28 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#include "sysdep/ptrace.h"
+
+/* These two are from asm-um/uaccess.h and linux/module.h, check them. */
+struct exception_table_entry
+{
+	unsigned long insn;
+	unsigned long fixup;
+};
+
+const struct exception_table_entry *search_exception_tables(unsigned long add);
+
+int arch_fixup(unsigned long address, struct uml_pt_regs *regs)
+{
+	const struct exception_table_entry *fixup;
+
+	fixup = search_exception_tables(address);
+	if (fixup != 0) {
+		UPT_IP(regs) = fixup->fixup;
+		return 1;
+	}
+	return 0;
+}

kernel/arch/um/sys-x86_64/ksyms.c

@@ -0,0 +1,11 @@
+#include <linux/module.h>
+#include <asm/string.h>
+#include <asm/checksum.h>
+
+/*XXX: we need them because they would be exported by x86_64 */
+#if (__GNUC__ == 4 && __GNUC_MINOR__ >= 3) || __GNUC__ > 4
+EXPORT_SYMBOL(memcpy);
+#else
+EXPORT_SYMBOL(__memcpy);
+#endif
+EXPORT_SYMBOL(csum_partial);

kernel/arch/um/sys-x86_64/mem.c

@@ -0,0 +1,16 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#include "linux/mm.h"
+#include "asm/page.h"
+#include "asm/mman.h"
+
+unsigned long vm_stack_flags = __VM_STACK_FLAGS;
+unsigned long vm_stack_flags32 = __VM_STACK_FLAGS;
+unsigned long vm_data_default_flags = __VM_DATA_DEFAULT_FLAGS;
+unsigned long vm_data_default_flags32 = __VM_DATA_DEFAULT_FLAGS;
+unsigned long vm_force_exec32 = PROT_EXEC;
+

kernel/arch/um/sys-x86_64/ptrace.c

@@ -0,0 +1,195 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ *
+ * Licensed under the GPL
+ */
+
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#define __FRAME_OFFSETS
+#include <asm/ptrace.h>
+#include <asm/uaccess.h>
+
+/*
+ * determines which flags the user has access to.
+ * 1 = access 0 = no access
+ */
+#define FLAG_MASK 0x44dd5UL
+
+int putreg(struct task_struct *child, int regno, unsigned long value)
+{
+	unsigned long tmp;
+
+#ifdef TIF_IA32
+	/*
+	 * Some code in the 64bit emulation may not be 64bit clean.
+	 * Don't take any chances.
+	 */
+	if (test_tsk_thread_flag(child, TIF_IA32))
+		value &= 0xffffffff;
+#endif
+	switch (regno) {
+	case FS:
+	case GS:
+	case DS:
+	case ES:
+	case SS:
+	case CS:
+		if (value && (value & 3) != 3)
+			return -EIO;
+		value &= 0xffff;
+		break;
+
+	case FS_BASE:
+	case GS_BASE:
+		if (!((value >> 48) == 0 || (value >> 48) == 0xffff))
+			return -EIO;
+		break;
+
+	case EFLAGS:
+		value &= FLAG_MASK;
+		tmp = PT_REGS_EFLAGS(&child->thread.regs) & ~FLAG_MASK;
+		value |= tmp;
+		break;
+	}
+
+	PT_REGS_SET(&child->thread.regs, regno, value);
+	return 0;
+}
+
+int poke_user(struct task_struct *child, long addr, long data)
+{
+	if ((addr & 3) || addr < 0)
+		return -EIO;
+
+	if (addr < MAX_REG_OFFSET)
+		return putreg(child, addr, data);
+	else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
+		(addr <= offsetof(struct user, u_debugreg[7]))) {
+		addr -= offsetof(struct user, u_debugreg[0]);
+		addr = addr >> 2;
+		if ((addr == 4) || (addr == 5))
+			return -EIO;
+		child->thread.arch.debugregs[addr] = data;
+		return 0;
+	}
+	return -EIO;
+}
+
+unsigned long getreg(struct task_struct *child, int regno)
+{
+	unsigned long retval = ~0UL;
+	switch (regno) {
+	case FS:
+	case GS:
+	case DS:
+	case ES:
+	case SS:
+	case CS:
+		retval = 0xffff;
+		/* fall through */
+	default:
+		retval &= PT_REG(&child->thread.regs, regno);
+#ifdef TIF_IA32
+		if (test_tsk_thread_flag(child, TIF_IA32))
+			retval &= 0xffffffff;
+#endif
+	}
+	return retval;
+}
+
+int peek_user(struct task_struct *child, long addr, long data)
+{
+	/* read the word at location addr in the USER area. */
+	unsigned long tmp;
+
+	if ((addr & 3) || addr < 0)
+		return -EIO;
+
+	tmp = 0;  /* Default return condition */
+	if (addr < MAX_REG_OFFSET)
+		tmp = getreg(child, addr);
+	else if ((addr >= offsetof(struct user, u_debugreg[0])) &&
+		(addr <= offsetof(struct user, u_debugreg[7]))) {
+		addr -= offsetof(struct user, u_debugreg[0]);
+		addr = addr >> 2;
+		tmp = child->thread.arch.debugregs[addr];
+	}
+	return put_user(tmp, (unsigned long *) data);
+}
+
+/* XXX Mostly copied from sys-i386 */
+int is_syscall(unsigned long addr)
+{
+	unsigned short instr;
+	int n;
+
+	n = copy_from_user(&instr, (void __user *) addr, sizeof(instr));
+	if (n) {
+		/*
+		 * access_process_vm() grants access to vsyscall and stub,
+		 * while copy_from_user doesn't. Maybe access_process_vm is
+		 * slow, but that doesn't matter, since it will be called only
+		 * in case of singlestepping, if copy_from_user failed.
+		 */
+		n = access_process_vm(current, addr, &instr, sizeof(instr), 0);
+		if (n != sizeof(instr)) {
+			printk("is_syscall : failed to read instruction from "
+			       "0x%lx\n", addr);
+			return 1;
+		}
+	}
+	/* sysenter */
+	return instr == 0x050f;
+}
+
+int get_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
+{
+	int err, n, cpu = ((struct thread_info *) child->stack)->cpu;
+	long fpregs[HOST_FP_SIZE];
+
+	BUG_ON(sizeof(*buf) != sizeof(fpregs));
+	err = save_fp_registers(userspace_pid[cpu], fpregs);
+	if (err)
+		return err;
+
+	n = copy_to_user(buf, fpregs, sizeof(fpregs));
+	if (n > 0)
+		return -EFAULT;
+
+	return n;
+}
+
+int set_fpregs(struct user_i387_struct __user *buf, struct task_struct *child)
+{
+	int n, cpu = ((struct thread_info *) child->stack)->cpu;
+	long fpregs[HOST_FP_SIZE];
+
+	BUG_ON(sizeof(*buf) != sizeof(fpregs));
+	n = copy_from_user(fpregs, buf, sizeof(fpregs));
+	if (n > 0)
+		return -EFAULT;
+
+	return restore_fp_registers(userspace_pid[cpu], fpregs);
+}
+
+long subarch_ptrace(struct task_struct *child, long request, long addr,
+		    long data)
+{
+	int ret = -EIO;
+
+	switch (request) {
+	case PTRACE_GETFPXREGS: /* Get the child FPU state. */
+		ret = get_fpregs((struct user_i387_struct __user *) data,
+				 child);
+		break;
+	case PTRACE_SETFPXREGS: /* Set the child FPU state. */
+		ret = set_fpregs((struct user_i387_struct __user *) data,
+				 child);
+		break;
+	}
+
+	return ret;
+}

kernel/arch/um/sys-x86_64/ptrace_user.c

@@ -0,0 +1,22 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#include <errno.h>
+#include "ptrace_user.h"
+
+int ptrace_getregs(long pid, unsigned long *regs_out)
+{
+	if (ptrace(PTRACE_GETREGS, pid, 0, regs_out) < 0)
+		return -errno;
+	return(0);
+}
+
+int ptrace_setregs(long pid, unsigned long *regs_out)
+{
+	if (ptrace(PTRACE_SETREGS, pid, 0, regs_out) < 0)
+		return -errno;
+	return(0);
+}

kernel/arch/um/sys-x86_64/setjmp.S

@@ -0,0 +1,54 @@
+#
+# arch/x86_64/setjmp.S
+#
+# setjmp/longjmp for the x86-64 architecture
+#
+
+#
+# The jmp_buf is assumed to contain the following, in order:
+#	%rbx
+#	%rsp (post-return)
+#	%rbp
+#	%r12
+#	%r13
+#	%r14
+#	%r15
+#	<return address>
+#
+
+	.text
+	.align 4
+	.globl setjmp
+	.type setjmp, @function
+setjmp:
+	pop  %rsi			# Return address, and adjust the stack
+	xorl %eax,%eax			# Return value
+	movq %rbx,(%rdi)
+	movq %rsp,8(%rdi)		# Post-return %rsp!
+	push %rsi			# Make the call/return stack happy
+	movq %rbp,16(%rdi)
+	movq %r12,24(%rdi)
+	movq %r13,32(%rdi)
+	movq %r14,40(%rdi)
+	movq %r15,48(%rdi)
+	movq %rsi,56(%rdi)		# Return address
+	ret
+
+	.size setjmp,.-setjmp
+
+	.text
+	.align 4
+	.globl longjmp
+	.type longjmp, @function
+longjmp:
+	movl %esi,%eax			# Return value (int)
+	movq (%rdi),%rbx
+	movq 8(%rdi),%rsp
+	movq 16(%rdi),%rbp
+	movq 24(%rdi),%r12
+	movq 32(%rdi),%r13
+	movq 40(%rdi),%r14
+	movq 48(%rdi),%r15
+	jmp *56(%rdi)
+
+	.size longjmp,.-longjmp

kernel/arch/um/sys-x86_64/shared/sysdep/archsetjmp.h

@@ -0,0 +1,24 @@
+/*
+ * arch/um/include/sysdep-x86_64/archsetjmp.h
+ */
+
+#ifndef _KLIBC_ARCHSETJMP_H
+#define _KLIBC_ARCHSETJMP_H
+
+struct __jmp_buf {
+	unsigned long __rbx;
+	unsigned long __rsp;
+	unsigned long __rbp;
+	unsigned long __r12;
+	unsigned long __r13;
+	unsigned long __r14;
+	unsigned long __r15;
+	unsigned long __rip;
+};
+
+typedef struct __jmp_buf jmp_buf[1];
+
+#define JB_IP __rip
+#define JB_SP __rsp
+
+#endif				/* _SETJMP_H */

kernel/arch/um/sys-x86_64/shared/sysdep/barrier.h

@@ -0,0 +1,7 @@
+#ifndef __SYSDEP_X86_64_BARRIER_H
+#define __SYSDEP_X86_64_BARRIER_H
+
+/* Copied from include/asm-x86_64 for use by userspace. */
+#define mb() 	asm volatile("mfence":::"memory")
+
+#endif

kernel/arch/um/sys-x86_64/shared/sysdep/checksum.h

@@ -0,0 +1,144 @@
+/*
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_SYSDEP_CHECKSUM_H
+#define __UM_SYSDEP_CHECKSUM_H
+
+#include "linux/string.h"
+#include "linux/in6.h"
+#include "asm/uaccess.h"
+
+extern __wsum csum_partial(const void *buff, int len, __wsum sum);
+
+/*
+ *	Note: when you get a NULL pointer exception here this means someone
+ *	passed in an incorrect kernel address to one of these functions.
+ *
+ *	If you use these functions directly please don't forget the
+ *	access_ok().
+ */
+
+static __inline__
+__wsum csum_partial_copy_nocheck(const void *src, void *dst,
+				       int len, __wsum sum)
+{
+	memcpy(dst, src, len);
+	return(csum_partial(dst, len, sum));
+}
+
+static __inline__
+__wsum csum_partial_copy_from_user(const void __user *src,
+                                         void *dst, int len, __wsum sum,
+                                         int *err_ptr)
+{
+        if (copy_from_user(dst, src, len)) {
+                *err_ptr = -EFAULT;
+                return (__force __wsum)-1;
+        }
+        return csum_partial(dst, len, sum);
+}
+
+/**
+ * csum_fold - Fold and invert a 32bit checksum.
+ * sum: 32bit unfolded sum
+ *
+ * Fold a 32bit running checksum to 16bit and invert it. This is usually
+ * the last step before putting a checksum into a packet.
+ * Make sure not to mix with 64bit checksums.
+ */
+static inline __sum16 csum_fold(__wsum sum)
+{
+	__asm__(
+		"  addl %1,%0\n"
+		"  adcl $0xffff,%0"
+		: "=r" (sum)
+		: "r" ((__force u32)sum << 16),
+		  "0" ((__force u32)sum & 0xffff0000)
+	);
+	return (__force __sum16)(~(__force u32)sum >> 16);
+}
+
+/**
+ * csum_tcpup_nofold - Compute an IPv4 pseudo header checksum.
+ * @saddr: source address
+ * @daddr: destination address
+ * @len: length of packet
+ * @proto: ip protocol of packet
+ * @sum: initial sum to be added in (32bit unfolded)
+ *
+ * Returns the pseudo header checksum the input data. Result is
+ * 32bit unfolded.
+ */
+static inline __wsum
+csum_tcpudp_nofold(__be32 saddr, __be32 daddr, unsigned short len,
+		   unsigned short proto, __wsum sum)
+{
+	asm("  addl %1, %0\n"
+	    "  adcl %2, %0\n"
+	    "  adcl %3, %0\n"
+	    "  adcl $0, %0\n"
+		: "=r" (sum)
+	    : "g" (daddr), "g" (saddr), "g" ((len + proto) << 8), "0" (sum));
+	return sum;
+}
+
+/*
+ * computes the checksum of the TCP/UDP pseudo-header
+ * returns a 16-bit checksum, already complemented
+ */
+static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
+					   unsigned short len,
+					   unsigned short proto,
+					   __wsum sum)
+{
+	return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,sum));
+}
+
+/**
+ * ip_fast_csum - Compute the IPv4 header checksum efficiently.
+ * iph: ipv4 header
+ * ihl: length of header / 4
+ */
+static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
+{
+	unsigned int sum;
+
+	asm(	"  movl (%1), %0\n"
+		"  subl $4, %2\n"
+		"  jbe 2f\n"
+		"  addl 4(%1), %0\n"
+		"  adcl 8(%1), %0\n"
+		"  adcl 12(%1), %0\n"
+		"1: adcl 16(%1), %0\n"
+		"  lea 4(%1), %1\n"
+		"  decl %2\n"
+		"  jne	1b\n"
+		"  adcl $0, %0\n"
+		"  movl %0, %2\n"
+		"  shrl $16, %0\n"
+		"  addw %w2, %w0\n"
+		"  adcl $0, %0\n"
+		"  notl %0\n"
+		"2:"
+	/* Since the input registers which are loaded with iph and ipl
+	   are modified, we must also specify them as outputs, or gcc
+	   will assume they contain their original values. */
+	: "=r" (sum), "=r" (iph), "=r" (ihl)
+	: "1" (iph), "2" (ihl)
+	: "memory");
+	return (__force __sum16)sum;
+}
+
+static inline unsigned add32_with_carry(unsigned a, unsigned b)
+{
+        asm("addl %2,%0\n\t"
+            "adcl $0,%0"
+            : "=r" (a)
+            : "0" (a), "r" (b));
+        return a;
+}
+
+extern __sum16 ip_compute_csum(const void *buff, int len);
+
+#endif

kernel/arch/um/sys-x86_64/shared/sysdep/faultinfo.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2004 Fujitsu Siemens Computers GmbH
+ * Author: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
+ * Licensed under the GPL
+ */
+
+#ifndef __FAULTINFO_X86_64_H
+#define __FAULTINFO_X86_64_H
+
+/* this structure contains the full arch-specific faultinfo
+ * from the traps.
+ * On i386, ptrace_faultinfo unfortunately doesn't provide
+ * all the info, since trap_no is missing.
+ * All common elements are defined at the same position in
+ * both structures, thus making it easy to copy the
+ * contents without knowledge about the structure elements.
+ */
+struct faultinfo {
+        int error_code; /* in ptrace_faultinfo misleadingly called is_write */
+        unsigned long cr2; /* in ptrace_faultinfo called addr */
+        int trap_no; /* missing in ptrace_faultinfo */
+};
+
+#define FAULT_WRITE(fi) ((fi).error_code & 2)
+#define FAULT_ADDRESS(fi) ((fi).cr2)
+
+#define PTRACE_FULL_FAULTINFO 1
+
+#endif

kernel/arch/um/sys-x86_64/shared/sysdep/host_ldt.h

@@ -0,0 +1,38 @@
+#ifndef __ASM_HOST_LDT_X86_64_H
+#define __ASM_HOST_LDT_X86_64_H
+
+#include <asm/ldt.h>
+
+/*
+ * macros stolen from include/asm-x86_64/desc.h
+ */
+#define LDT_entry_a(info) \
+	((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))
+
+/* Don't allow setting of the lm bit. It is useless anyways because
+ * 64bit system calls require __USER_CS. */
+#define LDT_entry_b(info) \
+	(((info)->base_addr & 0xff000000) | \
+	(((info)->base_addr & 0x00ff0000) >> 16) | \
+	((info)->limit & 0xf0000) | \
+	(((info)->read_exec_only ^ 1) << 9) | \
+	((info)->contents << 10) | \
+	(((info)->seg_not_present ^ 1) << 15) | \
+	((info)->seg_32bit << 22) | \
+	((info)->limit_in_pages << 23) | \
+	((info)->useable << 20) | \
+	/* ((info)->lm << 21) | */ \
+	0x7000)
+
+#define LDT_empty(info) (\
+	(info)->base_addr	== 0	&& \
+	(info)->limit		== 0	&& \
+	(info)->contents	== 0	&& \
+	(info)->read_exec_only	== 1	&& \
+	(info)->seg_32bit	== 0	&& \
+	(info)->limit_in_pages	== 0	&& \
+	(info)->seg_not_present	== 1	&& \
+	(info)->useable		== 0	&& \
+	(info)->lm              == 0)
+
+#endif

kernel/arch/um/sys-x86_64/shared/sysdep/kernel-offsets.h

@@ -0,0 +1,23 @@
+#include <linux/stddef.h>
+#include <linux/sched.h>
+#include <linux/time.h>
+#include <linux/elf.h>
+#include <linux/crypto.h>
+#include <asm/page.h>
+#include <asm/mman.h>
+
+#define DEFINE(sym, val) \
+	asm volatile("\n->" #sym " %0 " #val : : "i" (val))
+
+#define DEFINE_STR1(x) #x
+#define DEFINE_STR(sym, val) asm volatile("\n->" #sym " " DEFINE_STR1(val) " " #val: : )
+
+#define BLANK() asm volatile("\n->" : : )
+
+#define OFFSET(sym, str, mem) \
+	DEFINE(sym, offsetof(struct str, mem));
+
+void foo(void)
+{
+#include <common-offsets.h>
+}

kernel/arch/um/sys-x86_64/shared/sysdep/ptrace.h

@@ -0,0 +1,239 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ *
+ * Licensed under the GPL
+ */
+
+#ifndef __SYSDEP_X86_64_PTRACE_H
+#define __SYSDEP_X86_64_PTRACE_H
+
+#include "user_constants.h"
+#include "sysdep/faultinfo.h"
+
+#define MAX_REG_OFFSET (UM_FRAME_SIZE)
+#define MAX_REG_NR ((MAX_REG_OFFSET) / sizeof(unsigned long))
+
+#include "skas_ptregs.h"
+
+#define REGS_IP(r) ((r)[HOST_IP])
+#define REGS_SP(r) ((r)[HOST_SP])
+
+#define REGS_RBX(r) ((r)[HOST_RBX])
+#define REGS_RCX(r) ((r)[HOST_RCX])
+#define REGS_RDX(r) ((r)[HOST_RDX])
+#define REGS_RSI(r) ((r)[HOST_RSI])
+#define REGS_RDI(r) ((r)[HOST_RDI])
+#define REGS_RBP(r) ((r)[HOST_RBP])
+#define REGS_RAX(r) ((r)[HOST_RAX])
+#define REGS_R8(r) ((r)[HOST_R8])
+#define REGS_R9(r) ((r)[HOST_R9])
+#define REGS_R10(r) ((r)[HOST_R10])
+#define REGS_R11(r) ((r)[HOST_R11])
+#define REGS_R12(r) ((r)[HOST_R12])
+#define REGS_R13(r) ((r)[HOST_R13])
+#define REGS_R14(r) ((r)[HOST_R14])
+#define REGS_R15(r) ((r)[HOST_R15])
+#define REGS_CS(r) ((r)[HOST_CS])
+#define REGS_EFLAGS(r) ((r)[HOST_EFLAGS])
+#define REGS_SS(r) ((r)[HOST_SS])
+
+#define HOST_FS_BASE 21
+#define HOST_GS_BASE 22
+#define HOST_DS 23
+#define HOST_ES 24
+#define HOST_FS 25
+#define HOST_GS 26
+
+/* Also defined in asm/ptrace-x86_64.h, but not in libc headers.  So, these
+ * are already defined for kernel code, but not for userspace code.
+ */
+#ifndef FS_BASE
+/* These aren't defined in ptrace.h, but exist in struct user_regs_struct,
+ * which is what x86_64 ptrace actually uses.
+ */
+#define FS_BASE (HOST_FS_BASE * sizeof(long))
+#define GS_BASE (HOST_GS_BASE * sizeof(long))
+#define DS (HOST_DS * sizeof(long))
+#define ES (HOST_ES * sizeof(long))
+#define FS (HOST_FS * sizeof(long))
+#define GS (HOST_GS * sizeof(long))
+#endif
+
+#define REGS_FS_BASE(r) ((r)[HOST_FS_BASE])
+#define REGS_GS_BASE(r) ((r)[HOST_GS_BASE])
+#define REGS_DS(r) ((r)[HOST_DS])
+#define REGS_ES(r) ((r)[HOST_ES])
+#define REGS_FS(r) ((r)[HOST_FS])
+#define REGS_GS(r) ((r)[HOST_GS])
+
+#define REGS_ORIG_RAX(r) ((r)[HOST_ORIG_RAX])
+
+#define REGS_SET_SYSCALL_RETURN(r, res) REGS_RAX(r) = (res)
+
+#define REGS_RESTART_SYSCALL(r) IP_RESTART_SYSCALL(REGS_IP(r))
+
+#define REGS_SEGV_IS_FIXABLE(r) SEGV_IS_FIXABLE((r)->trap_type)
+
+#define REGS_FAULT_ADDR(r) ((r)->fault_addr)
+
+#define REGS_FAULT_WRITE(r) FAULT_WRITE((r)->fault_type)
+
+#define REGS_TRAP(r) ((r)->trap_type)
+
+#define REGS_ERR(r) ((r)->fault_type)
+
+struct uml_pt_regs {
+	unsigned long gp[MAX_REG_NR];
+	struct faultinfo faultinfo;
+	long syscall;
+	int is_user;
+};
+
+#define EMPTY_UML_PT_REGS { }
+
+#define UPT_RBX(r) REGS_RBX((r)->gp)
+#define UPT_RCX(r) REGS_RCX((r)->gp)
+#define UPT_RDX(r) REGS_RDX((r)->gp)
+#define UPT_RSI(r) REGS_RSI((r)->gp)
+#define UPT_RDI(r) REGS_RDI((r)->gp)
+#define UPT_RBP(r) REGS_RBP((r)->gp)
+#define UPT_RAX(r) REGS_RAX((r)->gp)
+#define UPT_R8(r) REGS_R8((r)->gp)
+#define UPT_R9(r) REGS_R9((r)->gp)
+#define UPT_R10(r) REGS_R10((r)->gp)
+#define UPT_R11(r) REGS_R11((r)->gp)
+#define UPT_R12(r) REGS_R12((r)->gp)
+#define UPT_R13(r) REGS_R13((r)->gp)
+#define UPT_R14(r) REGS_R14((r)->gp)
+#define UPT_R15(r) REGS_R15((r)->gp)
+#define UPT_CS(r) REGS_CS((r)->gp)
+#define UPT_FS_BASE(r) REGS_FS_BASE((r)->gp)
+#define UPT_FS(r) REGS_FS((r)->gp)
+#define UPT_GS_BASE(r) REGS_GS_BASE((r)->gp)
+#define UPT_GS(r) REGS_GS((r)->gp)
+#define UPT_DS(r) REGS_DS((r)->gp)
+#define UPT_ES(r) REGS_ES((r)->gp)
+#define UPT_CS(r) REGS_CS((r)->gp)
+#define UPT_SS(r) REGS_SS((r)->gp)
+#define UPT_ORIG_RAX(r) REGS_ORIG_RAX((r)->gp)
+
+#define UPT_IP(r) REGS_IP((r)->gp)
+#define UPT_SP(r) REGS_SP((r)->gp)
+
+#define UPT_EFLAGS(r) REGS_EFLAGS((r)->gp)
+#define UPT_SYSCALL_NR(r) ((r)->syscall)
+#define UPT_SYSCALL_RET(r) UPT_RAX(r)
+
+extern int user_context(unsigned long sp);
+
+#define UPT_IS_USER(r) ((r)->is_user)
+
+#define UPT_SYSCALL_ARG1(r) UPT_RDI(r)
+#define UPT_SYSCALL_ARG2(r) UPT_RSI(r)
+#define UPT_SYSCALL_ARG3(r) UPT_RDX(r)
+#define UPT_SYSCALL_ARG4(r) UPT_R10(r)
+#define UPT_SYSCALL_ARG5(r) UPT_R8(r)
+#define UPT_SYSCALL_ARG6(r) UPT_R9(r)
+
+struct syscall_args {
+	unsigned long args[6];
+};
+
+#define SYSCALL_ARGS(r) ((struct syscall_args) \
+			 { .args = { UPT_SYSCALL_ARG1(r),	 \
+				     UPT_SYSCALL_ARG2(r),	 \
+				     UPT_SYSCALL_ARG3(r),	 \
+				     UPT_SYSCALL_ARG4(r),	 \
+				     UPT_SYSCALL_ARG5(r),	 \
+				     UPT_SYSCALL_ARG6(r) } } )
+
+#define UPT_REG(regs, reg) \
+	({      unsigned long val;		\
+		switch(reg){						\
+		case R8: val = UPT_R8(regs); break;			\
+		case R9: val = UPT_R9(regs); break;			\
+		case R10: val = UPT_R10(regs); break;			\
+		case R11: val = UPT_R11(regs); break;			\
+		case R12: val = UPT_R12(regs); break;			\
+		case R13: val = UPT_R13(regs); break;			\
+		case R14: val = UPT_R14(regs); break;			\
+		case R15: val = UPT_R15(regs); break;			\
+		case RIP: val = UPT_IP(regs); break;			\
+		case RSP: val = UPT_SP(regs); break;			\
+		case RAX: val = UPT_RAX(regs); break;			\
+		case RBX: val = UPT_RBX(regs); break;			\
+		case RCX: val = UPT_RCX(regs); break;			\
+		case RDX: val = UPT_RDX(regs); break;			\
+		case RSI: val = UPT_RSI(regs); break;			\
+		case RDI: val = UPT_RDI(regs); break;			\
+		case RBP: val = UPT_RBP(regs); break;			\
+		case ORIG_RAX: val = UPT_ORIG_RAX(regs); break;		\
+		case CS: val = UPT_CS(regs); break;			\
+		case SS: val = UPT_SS(regs); break;			\
+		case FS_BASE: val = UPT_FS_BASE(regs); break;		\
+		case GS_BASE: val = UPT_GS_BASE(regs); break;		\
+		case DS: val = UPT_DS(regs); break;			\
+		case ES: val = UPT_ES(regs); break;			\
+		case FS : val = UPT_FS (regs); break;			\
+		case GS: val = UPT_GS(regs); break;			\
+		case EFLAGS: val = UPT_EFLAGS(regs); break;		\
+		default :						\
+			panic("Bad register in UPT_REG : %d\n", reg);	\
+			val = -1;					\
+		}							\
+		val;							\
+	})
+
+
+#define UPT_SET(regs, reg, val) \
+	({      unsigned long __upt_val = val;	\
+		switch(reg){						\
+		case R8: UPT_R8(regs) = __upt_val; break;		\
+		case R9: UPT_R9(regs) = __upt_val; break;		\
+		case R10: UPT_R10(regs) = __upt_val; break;		\
+		case R11: UPT_R11(regs) = __upt_val; break;		\
+		case R12: UPT_R12(regs) = __upt_val; break;		\
+		case R13: UPT_R13(regs) = __upt_val; break;		\
+		case R14: UPT_R14(regs) = __upt_val; break;		\
+		case R15: UPT_R15(regs) = __upt_val; break;		\
+		case RIP: UPT_IP(regs) = __upt_val; break;		\
+		case RSP: UPT_SP(regs) = __upt_val; break;		\
+		case RAX: UPT_RAX(regs) = __upt_val; break;		\
+		case RBX: UPT_RBX(regs) = __upt_val; break;		\
+		case RCX: UPT_RCX(regs) = __upt_val; break;		\
+		case RDX: UPT_RDX(regs) = __upt_val; break;		\
+		case RSI: UPT_RSI(regs) = __upt_val; break;		\
+		case RDI: UPT_RDI(regs) = __upt_val; break;		\
+		case RBP: UPT_RBP(regs) = __upt_val; break;		\
+		case ORIG_RAX: UPT_ORIG_RAX(regs) = __upt_val; break;	\
+		case CS: UPT_CS(regs) = __upt_val; break;		\
+		case SS: UPT_SS(regs) = __upt_val; break;		\
+		case FS_BASE: UPT_FS_BASE(regs) = __upt_val; break;	\
+		case GS_BASE: UPT_GS_BASE(regs) = __upt_val; break;	\
+		case DS: UPT_DS(regs) = __upt_val; break;		\
+		case ES: UPT_ES(regs) = __upt_val; break;		\
+		case FS: UPT_FS(regs) = __upt_val; break;		\
+		case GS: UPT_GS(regs) = __upt_val; break;		\
+		case EFLAGS: UPT_EFLAGS(regs) = __upt_val; break;	\
+		default :						\
+			panic("Bad register in UPT_SET : %d\n", reg);	\
+			break;						\
+		}							\
+		__upt_val;						\
+	})
+
+#define UPT_SET_SYSCALL_RETURN(r, res) \
+	REGS_SET_SYSCALL_RETURN((r)->regs, (res))
+
+#define UPT_RESTART_SYSCALL(r) REGS_RESTART_SYSCALL((r)->gp)
+
+#define UPT_SEGV_IS_FIXABLE(r) REGS_SEGV_IS_FIXABLE(&r->skas)
+
+#define UPT_FAULTINFO(r) (&(r)->faultinfo)
+
+static inline void arch_init_registers(int pid)
+{
+}
+
+#endif

kernel/arch/um/sys-x86_64/shared/sysdep/ptrace_user.h

@@ -0,0 +1,77 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#ifndef __SYSDEP_X86_64_PTRACE_USER_H__
+#define __SYSDEP_X86_64_PTRACE_USER_H__
+
+#define __FRAME_OFFSETS
+#include <sys/ptrace.h>
+#include <linux/ptrace.h>
+#include <asm/ptrace.h>
+#undef __FRAME_OFFSETS
+#include "user_constants.h"
+
+#define PT_INDEX(off) ((off) / sizeof(unsigned long))
+
+#define PT_SYSCALL_NR(regs) ((regs)[PT_INDEX(ORIG_RAX)])
+#define PT_SYSCALL_NR_OFFSET (ORIG_RAX)
+
+#define PT_SYSCALL_ARG1(regs) (((unsigned long *) (regs))[PT_INDEX(RDI)])
+#define PT_SYSCALL_ARG1_OFFSET (RDI)
+
+#define PT_SYSCALL_ARG2(regs) (((unsigned long *) (regs))[PT_INDEX(RSI)])
+#define PT_SYSCALL_ARG2_OFFSET (RSI)
+
+#define PT_SYSCALL_ARG3(regs) (((unsigned long *) (regs))[PT_INDEX(RDX)])
+#define PT_SYSCALL_ARG3_OFFSET (RDX)
+
+#define PT_SYSCALL_ARG4(regs) (((unsigned long *) (regs))[PT_INDEX(RCX)])
+#define PT_SYSCALL_ARG4_OFFSET (RCX)
+
+#define PT_SYSCALL_ARG5(regs) (((unsigned long *) (regs))[PT_INDEX(R8)])
+#define PT_SYSCALL_ARG5_OFFSET (R8)
+
+#define PT_SYSCALL_ARG6(regs) (((unsigned long *) (regs))[PT_INDEX(R9)])
+#define PT_SYSCALL_ARG6_OFFSET (R9)
+
+#define PT_SYSCALL_RET_OFFSET (RAX)
+
+#define PT_IP_OFFSET (RIP)
+#define PT_IP(regs) ((regs)[PT_INDEX(RIP)])
+
+#define PT_SP_OFFSET (RSP)
+#define PT_SP(regs) ((regs)[PT_INDEX(RSP)])
+
+#define PT_ORIG_RAX_OFFSET (ORIG_RAX)
+#define PT_ORIG_RAX(regs) ((regs)[PT_INDEX(ORIG_RAX)])
+
+/*
+ * x86_64 FC3 doesn't define this in /usr/include/linux/ptrace.h even though
+ * it's defined in the kernel's include/linux/ptrace.h. Additionally, use the
+ * 2.4 name and value for 2.4 host compatibility.
+ */
+#ifndef PTRACE_OLDSETOPTIONS
+#define PTRACE_OLDSETOPTIONS 21
+#endif
+
+/*
+ * These are before the system call, so the system call number is RAX
+ * rather than ORIG_RAX, and arg4 is R10 rather than RCX
+ */
+#define REGS_SYSCALL_NR PT_INDEX(RAX)
+#define REGS_SYSCALL_ARG1 PT_INDEX(RDI)
+#define REGS_SYSCALL_ARG2 PT_INDEX(RSI)
+#define REGS_SYSCALL_ARG3 PT_INDEX(RDX)
+#define REGS_SYSCALL_ARG4 PT_INDEX(R10)
+#define REGS_SYSCALL_ARG5 PT_INDEX(R8)
+#define REGS_SYSCALL_ARG6 PT_INDEX(R9)
+
+#define REGS_IP_INDEX PT_INDEX(RIP)
+#define REGS_SP_INDEX PT_INDEX(RSP)
+
+#define FP_SIZE (HOST_FP_SIZE)
+
+#endif

kernel/arch/um/sys-x86_64/shared/sysdep/sc.h

@@ -0,0 +1,45 @@
+#ifndef __SYSDEP_X86_64_SC_H
+#define __SYSDEP_X86_64_SC_H
+
+/* Copyright (C) 2003 - 2004 PathScale, Inc
+ * Released under the GPL
+ */
+
+#include <user_constants.h>
+
+#define SC_OFFSET(sc, field) \
+	 *((unsigned long *) &(((char *) (sc))[HOST_##field]))
+
+#define SC_RBX(sc) SC_OFFSET(sc, SC_RBX)
+#define SC_RCX(sc) SC_OFFSET(sc, SC_RCX)
+#define SC_RDX(sc) SC_OFFSET(sc, SC_RDX)
+#define SC_RSI(sc) SC_OFFSET(sc, SC_RSI)
+#define SC_RDI(sc) SC_OFFSET(sc, SC_RDI)
+#define SC_RBP(sc) SC_OFFSET(sc, SC_RBP)
+#define SC_RAX(sc) SC_OFFSET(sc, SC_RAX)
+#define SC_R8(sc) SC_OFFSET(sc, SC_R8)
+#define SC_R9(sc) SC_OFFSET(sc, SC_R9)
+#define SC_R10(sc) SC_OFFSET(sc, SC_R10)
+#define SC_R11(sc) SC_OFFSET(sc, SC_R11)
+#define SC_R12(sc) SC_OFFSET(sc, SC_R12)
+#define SC_R13(sc) SC_OFFSET(sc, SC_R13)
+#define SC_R14(sc) SC_OFFSET(sc, SC_R14)
+#define SC_R15(sc) SC_OFFSET(sc, SC_R15)
+#define SC_IP(sc) SC_OFFSET(sc, SC_IP)
+#define SC_SP(sc) SC_OFFSET(sc, SC_SP)
+#define SC_CR2(sc) SC_OFFSET(sc, SC_CR2)
+#define SC_ERR(sc) SC_OFFSET(sc, SC_ERR)
+#define SC_TRAPNO(sc) SC_OFFSET(sc, SC_TRAPNO)
+#define SC_CS(sc) SC_OFFSET(sc, SC_CS)
+#define SC_FS(sc) SC_OFFSET(sc, SC_FS)
+#define SC_GS(sc) SC_OFFSET(sc, SC_GS)
+#define SC_EFLAGS(sc) SC_OFFSET(sc, SC_EFLAGS)
+#define SC_SIGMASK(sc) SC_OFFSET(sc, SC_SIGMASK)
+#define SC_SS(sc) SC_OFFSET(sc, SC_SS)
+#if 0
+#define SC_ORIG_RAX(sc) SC_OFFSET(sc, SC_ORIG_RAX)
+#define SC_DS(sc) SC_OFFSET(sc, SC_DS)
+#define SC_ES(sc) SC_OFFSET(sc, SC_ES)
+#endif
+
+#endif

kernel/arch/um/sys-x86_64/shared/sysdep/sigcontext.h

@@ -0,0 +1,27 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#ifndef __SYSDEP_X86_64_SIGCONTEXT_H
+#define __SYSDEP_X86_64_SIGCONTEXT_H
+
+#include <sysdep/sc.h>
+
+#define IP_RESTART_SYSCALL(ip) ((ip) -= 2)
+
+#define GET_FAULTINFO_FROM_SC(fi, sc) \
+	{ \
+		(fi).cr2 = SC_CR2(sc); \
+		(fi).error_code = SC_ERR(sc); \
+		(fi).trap_no = SC_TRAPNO(sc); \
+	}
+
+/* This is Page Fault */
+#define SEGV_IS_FIXABLE(fi)	((fi)->trap_no == 14)
+
+/* No broken SKAS API, which doesn't pass trap_no, here. */
+#define SEGV_MAYBE_FIXABLE(fi)	0
+
+#endif

kernel/arch/um/sys-x86_64/shared/sysdep/skas_ptrace.h

@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SYSDEP_X86_64_SKAS_PTRACE_H
+#define __SYSDEP_X86_64_SKAS_PTRACE_H
+
+struct ptrace_faultinfo {
+        int is_write;
+        unsigned long addr;
+};
+
+struct ptrace_ldt {
+        int func;
+        void *ptr;
+        unsigned long bytecount;
+};
+
+#define PTRACE_LDT 54
+
+#endif

kernel/arch/um/sys-x86_64/shared/sysdep/stub.h

@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SYSDEP_STUB_H
+#define __SYSDEP_STUB_H
+
+#include <sys/mman.h>
+#include <asm/unistd.h>
+#include <sysdep/ptrace_user.h>
+#include "as-layout.h"
+#include "stub-data.h"
+#include "kern_constants.h"
+
+extern void stub_segv_handler(int sig);
+extern void stub_clone_handler(void);
+
+#define STUB_SYSCALL_RET PT_INDEX(RAX)
+#define STUB_MMAP_NR __NR_mmap
+#define MMAP_OFFSET(o) (o)
+
+#define __syscall_clobber "r11","rcx","memory"
+#define __syscall "syscall"
+
+static inline long stub_syscall0(long syscall)
+{
+	long ret;
+
+	__asm__ volatile (__syscall
+		: "=a" (ret)
+		: "0" (syscall) : __syscall_clobber );
+
+	return ret;
+}
+
+static inline long stub_syscall2(long syscall, long arg1, long arg2)
+{
+	long ret;
+
+	__asm__ volatile (__syscall
+		: "=a" (ret)
+		: "0" (syscall), "D" (arg1), "S" (arg2) : __syscall_clobber );
+
+	return ret;
+}
+
+static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3)
+{
+	long ret;
+
+	__asm__ volatile (__syscall
+		: "=a" (ret)
+		: "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3)
+		: __syscall_clobber );
+
+	return ret;
+}
+
+static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3,
+				 long arg4)
+{
+	long ret;
+
+	__asm__ volatile ("movq %5,%%r10 ; " __syscall
+		: "=a" (ret)
+		: "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3),
+		  "g" (arg4)
+		: __syscall_clobber, "r10" );
+
+	return ret;
+}
+
+static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3,
+				 long arg4, long arg5)
+{
+	long ret;
+
+	__asm__ volatile ("movq %5,%%r10 ; movq %6,%%r8 ; " __syscall
+		: "=a" (ret)
+		: "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3),
+		  "g" (arg4), "g" (arg5)
+		: __syscall_clobber, "r10", "r8" );
+
+	return ret;
+}
+
+static inline void trap_myself(void)
+{
+	__asm("int3");
+}
+
+static inline void remap_stack(long fd, unsigned long offset)
+{
+	__asm__ volatile ("movq %4,%%r10 ; movq %5,%%r8 ; "
+			  "movq %6, %%r9; " __syscall "; movq %7, %%rbx ; "
+			  "movq %%rax, (%%rbx)":
+			  : "a" (STUB_MMAP_NR), "D" (STUB_DATA),
+			    "S" (UM_KERN_PAGE_SIZE),
+			    "d" (PROT_READ | PROT_WRITE),
+                            "g" (MAP_FIXED | MAP_SHARED), "g" (fd),
+			    "g" (offset),
+			    "i" (&((struct stub_data *) STUB_DATA)->err)
+			  : __syscall_clobber, "r10", "r8", "r9" );
+}
+
+#endif

kernel/arch/um/sys-x86_64/shared/sysdep/syscalls.h

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#ifndef __SYSDEP_X86_64_SYSCALLS_H__
+#define __SYSDEP_X86_64_SYSCALLS_H__
+
+#include <linux/msg.h>
+#include <linux/shm.h>
+#include <kern_constants.h>
+
+typedef long syscall_handler_t(void);
+
+extern syscall_handler_t *sys_call_table[];
+
+#define EXECUTE_SYSCALL(syscall, regs) \
+	(((long (*)(long, long, long, long, long, long)) \
+	  (*sys_call_table[syscall]))(UPT_SYSCALL_ARG1(&regs->regs), \
+		 		      UPT_SYSCALL_ARG2(&regs->regs), \
+				      UPT_SYSCALL_ARG3(&regs->regs), \
+				      UPT_SYSCALL_ARG4(&regs->regs), \
+				      UPT_SYSCALL_ARG5(&regs->regs), \
+				      UPT_SYSCALL_ARG6(&regs->regs)))
+
+extern long old_mmap(unsigned long addr, unsigned long len,
+		     unsigned long prot, unsigned long flags,
+		     unsigned long fd, unsigned long pgoff);
+extern syscall_handler_t sys_modify_ldt;
+extern syscall_handler_t sys_arch_prctl;
+
+#endif

kernel/arch/um/sys-x86_64/shared/sysdep/system.h

@@ -0,0 +1,132 @@
+#ifndef _ASM_X86_SYSTEM_H_
+#define _ASM_X86_SYSTEM_H_
+
+#include <asm/asm.h>
+#include <asm/segment.h>
+#include <asm/cpufeature.h>
+#include <asm/cmpxchg.h>
+#include <asm/nops.h>
+
+#include <linux/kernel.h>
+#include <linux/irqflags.h>
+
+/* entries in ARCH_DLINFO: */
+#ifdef CONFIG_IA32_EMULATION
+# define AT_VECTOR_SIZE_ARCH 2
+#else
+# define AT_VECTOR_SIZE_ARCH 1
+#endif
+
+extern unsigned long arch_align_stack(unsigned long sp);
+
+void default_idle(void);
+
+/*
+ * Force strict CPU ordering.
+ * And yes, this is required on UP too when we're talking
+ * to devices.
+ */
+#ifdef CONFIG_X86_32
+/*
+ * Some non-Intel clones support out of order store. wmb() ceases to be a
+ * nop for these.
+ */
+#define mb() alternative("lock; addl $0,0(%%esp)", "mfence", X86_FEATURE_XMM2)
+#define rmb() alternative("lock; addl $0,0(%%esp)", "lfence", X86_FEATURE_XMM2)
+#define wmb() alternative("lock; addl $0,0(%%esp)", "sfence", X86_FEATURE_XMM)
+#else
+#define mb() 	asm volatile("mfence":::"memory")
+#define rmb()	asm volatile("lfence":::"memory")
+#define wmb()	asm volatile("sfence" ::: "memory")
+#endif
+
+/**
+ * read_barrier_depends - Flush all pending reads that subsequents reads
+ * depend on.
+ *
+ * No data-dependent reads from memory-like regions are ever reordered
+ * over this barrier.  All reads preceding this primitive are guaranteed
+ * to access memory (but not necessarily other CPUs' caches) before any
+ * reads following this primitive that depend on the data return by
+ * any of the preceding reads.  This primitive is much lighter weight than
+ * rmb() on most CPUs, and is never heavier weight than is
+ * rmb().
+ *
+ * These ordering constraints are respected by both the local CPU
+ * and the compiler.
+ *
+ * Ordering is not guaranteed by anything other than these primitives,
+ * not even by data dependencies.  See the documentation for
+ * memory_barrier() for examples and URLs to more information.
+ *
+ * For example, the following code would force ordering (the initial
+ * value of "a" is zero, "b" is one, and "p" is "&a"):
+ *
+ * <programlisting>
+ *	CPU 0				CPU 1
+ *
+ *	b = 2;
+ *	memory_barrier();
+ *	p = &b;				q = p;
+ *					read_barrier_depends();
+ *					d = *q;
+ * </programlisting>
+ *
+ * because the read of "*q" depends on the read of "p" and these
+ * two reads are separated by a read_barrier_depends().  However,
+ * the following code, with the same initial values for "a" and "b":
+ *
+ * <programlisting>
+ *	CPU 0				CPU 1
+ *
+ *	a = 2;
+ *	memory_barrier();
+ *	b = 3;				y = b;
+ *					read_barrier_depends();
+ *					x = a;
+ * </programlisting>
+ *
+ * does not enforce ordering, since there is no data dependency between
+ * the read of "a" and the read of "b".  Therefore, on some CPUs, such
+ * as Alpha, "y" could be set to 3 and "x" to 0.  Use rmb()
+ * in cases like this where there are no data dependencies.
+ **/
+
+#define read_barrier_depends()	do { } while (0)
+
+#ifdef CONFIG_SMP
+#define smp_mb()	mb()
+#ifdef CONFIG_X86_PPRO_FENCE
+# define smp_rmb()	rmb()
+#else
+# define smp_rmb()	barrier()
+#endif
+#ifdef CONFIG_X86_OOSTORE
+# define smp_wmb() 	wmb()
+#else
+# define smp_wmb()	barrier()
+#endif
+#define smp_read_barrier_depends()	read_barrier_depends()
+#define set_mb(var, value) do { (void)xchg(&var, value); } while (0)
+#else
+#define smp_mb()	barrier()
+#define smp_rmb()	barrier()
+#define smp_wmb()	barrier()
+#define smp_read_barrier_depends()	do { } while (0)
+#define set_mb(var, value) do { var = value; barrier(); } while (0)
+#endif
+
+/*
+ * Stop RDTSC speculation. This is needed when you need to use RDTSC
+ * (or get_cycles or vread that possibly accesses the TSC) in a defined
+ * code region.
+ *
+ * (Could use an alternative three way for this if there was one.)
+ */
+static inline void rdtsc_barrier(void)
+{
+	alternative(ASM_NOP3, "mfence", X86_FEATURE_MFENCE_RDTSC);
+	alternative(ASM_NOP3, "lfence", X86_FEATURE_LFENCE_RDTSC);
+}
+
+#endif

kernel/arch/um/sys-x86_64/shared/sysdep/tls.h

@@ -0,0 +1,29 @@
+#ifndef _SYSDEP_TLS_H
+#define _SYSDEP_TLS_H
+
+# ifndef __KERNEL__
+
+/* Change name to avoid conflicts with the original one from <asm/ldt.h>, which
+ * may be named user_desc (but in 2.4 and in header matching its API was named
+ * modify_ldt_ldt_s). */
+
+typedef struct um_dup_user_desc {
+	unsigned int  entry_number;
+	unsigned int  base_addr;
+	unsigned int  limit;
+	unsigned int  seg_32bit:1;
+	unsigned int  contents:2;
+	unsigned int  read_exec_only:1;
+	unsigned int  limit_in_pages:1;
+	unsigned int  seg_not_present:1;
+	unsigned int  useable:1;
+	unsigned int  lm:1;
+} user_desc_t;
+
+# else /* __KERNEL__ */
+
+#  include <ldt.h>
+typedef struct user_desc user_desc_t;
+
+# endif /* __KERNEL__ */
+#endif /* _SYSDEP_TLS_H */

kernel/arch/um/sys-x86_64/shared/sysdep/vm-flags.h

@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
+ * Copyright 2003 PathScale, Inc.
+ * Licensed under the GPL
+ */
+
+#ifndef __VM_FLAGS_X86_64_H
+#define __VM_FLAGS_X86_64_H
+
+#define __VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
+				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
+#define __VM_STACK_FLAGS 	(VM_GROWSDOWN | VM_READ | VM_WRITE | \
+				 VM_EXEC | VM_MAYREAD | VM_MAYWRITE | \
+				 VM_MAYEXEC)
+
+extern unsigned long vm_stack_flags, vm_stack_flags32;
+extern unsigned long vm_data_default_flags, vm_data_default_flags32;
+extern unsigned long vm_force_exec32;
+
+#ifdef TIF_IA32
+#define VM_DATA_DEFAULT_FLAGS \
+	(test_thread_flag(TIF_IA32) ? vm_data_default_flags32 : \
+	  vm_data_default_flags)
+
+#define VM_STACK_DEFAULT_FLAGS \
+	(test_thread_flag(TIF_IA32) ? vm_stack_flags32 : vm_stack_flags)
+#endif
+
+#define VM_DATA_DEFAULT_FLAGS vm_data_default_flags
+
+#define VM_STACK_DEFAULT_FLAGS vm_stack_flags
+
+#endif

kernel/arch/um/sys-x86_64/signal.c

@@ -0,0 +1,291 @@
+/*
+ * Copyright (C) 2003 PathScale, Inc.
+ * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <linux/personality.h>
+#include <linux/ptrace.h>
+#include <asm/unistd.h>
+#include <asm/uaccess.h>
+#include <asm/ucontext.h>
+#include "frame_kern.h"
+#include "skas.h"
+
+void copy_sc(struct uml_pt_regs *regs, void *from)
+{
+	struct sigcontext *sc = from;
+
+#define GETREG(regs, regno, sc, regname)				\
+	(regs)->gp[(regno) / sizeof(unsigned long)] = (sc)->regname
+
+	GETREG(regs, R8, sc, r8);
+	GETREG(regs, R9, sc, r9);
+	GETREG(regs, R10, sc, r10);
+	GETREG(regs, R11, sc, r11);
+	GETREG(regs, R12, sc, r12);
+	GETREG(regs, R13, sc, r13);
+	GETREG(regs, R14, sc, r14);
+	GETREG(regs, R15, sc, r15);
+	GETREG(regs, RDI, sc, di);
+	GETREG(regs, RSI, sc, si);
+	GETREG(regs, RBP, sc, bp);
+	GETREG(regs, RBX, sc, bx);
+	GETREG(regs, RDX, sc, dx);
+	GETREG(regs, RAX, sc, ax);
+	GETREG(regs, RCX, sc, cx);
+	GETREG(regs, RSP, sc, sp);
+	GETREG(regs, RIP, sc, ip);
+	GETREG(regs, EFLAGS, sc, flags);
+	GETREG(regs, CS, sc, cs);
+
+#undef GETREG
+}
+
+static int copy_sc_from_user(struct pt_regs *regs,
+			     struct sigcontext __user *from,
+			     struct _fpstate __user *fpp)
+{
+	struct user_i387_struct fp;
+	int err = 0;
+
+#define GETREG(regs, regno, sc, regname)				\
+	__get_user((regs)->regs.gp[(regno) / sizeof(unsigned long)],	\
+		   &(sc)->regname)
+
+	err |= GETREG(regs, R8, from, r8);
+	err |= GETREG(regs, R9, from, r9);
+	err |= GETREG(regs, R10, from, r10);
+	err |= GETREG(regs, R11, from, r11);
+	err |= GETREG(regs, R12, from, r12);
+	err |= GETREG(regs, R13, from, r13);
+	err |= GETREG(regs, R14, from, r14);
+	err |= GETREG(regs, R15, from, r15);
+	err |= GETREG(regs, RDI, from, di);
+	err |= GETREG(regs, RSI, from, si);
+	err |= GETREG(regs, RBP, from, bp);
+	err |= GETREG(regs, RBX, from, bx);
+	err |= GETREG(regs, RDX, from, dx);
+	err |= GETREG(regs, RAX, from, ax);
+	err |= GETREG(regs, RCX, from, cx);
+	err |= GETREG(regs, RSP, from, sp);
+	err |= GETREG(regs, RIP, from, ip);
+	err |= GETREG(regs, EFLAGS, from, flags);
+	err |= GETREG(regs, CS, from, cs);
+	if (err)
+		return 1;
+
+#undef GETREG
+
+	err = copy_from_user(&fp, fpp, sizeof(struct user_i387_struct));
+	if (err)
+		return 1;
+
+	err = restore_fp_registers(userspace_pid[current_thread_info()->cpu],
+				   (unsigned long *) &fp);
+	if (err < 0) {
+		printk(KERN_ERR "copy_sc_from_user - "
+		       "restore_fp_registers failed, errno = %d\n",
+		       -err);
+		return 1;
+	}
+
+	return 0;
+}
+
+static int copy_sc_to_user(struct sigcontext __user *to,
+			   struct _fpstate __user *to_fp, struct pt_regs *regs,
+			   unsigned long mask, unsigned long sp)
+{
+	struct faultinfo * fi = &current->thread.arch.faultinfo;
+	struct user_i387_struct fp;
+	int err = 0;
+
+	err |= __put_user(0, &to->gs);
+	err |= __put_user(0, &to->fs);
+
+#define PUTREG(regs, regno, sc, regname)				\
+	__put_user((regs)->regs.gp[(regno) / sizeof(unsigned long)],	\
+		   &(sc)->regname)
+
+	err |= PUTREG(regs, RDI, to, di);
+	err |= PUTREG(regs, RSI, to, si);
+	err |= PUTREG(regs, RBP, to, bp);
+	/*
+	 * Must use original RSP, which is passed in, rather than what's in
+	 * the pt_regs, because that's already been updated to point at the
+	 * signal frame.
+	 */
+	err |= __put_user(sp, &to->sp);
+	err |= PUTREG(regs, RBX, to, bx);
+	err |= PUTREG(regs, RDX, to, dx);
+	err |= PUTREG(regs, RCX, to, cx);
+	err |= PUTREG(regs, RAX, to, ax);
+	err |= PUTREG(regs, R8, to, r8);
+	err |= PUTREG(regs, R9, to, r9);
+	err |= PUTREG(regs, R10, to, r10);
+	err |= PUTREG(regs, R11, to, r11);
+	err |= PUTREG(regs, R12, to, r12);
+	err |= PUTREG(regs, R13, to, r13);
+	err |= PUTREG(regs, R14, to, r14);
+	err |= PUTREG(regs, R15, to, r15);
+	err |= PUTREG(regs, CS, to, cs); /* XXX x86_64 doesn't do this */
+
+	err |= __put_user(fi->cr2, &to->cr2);
+	err |= __put_user(fi->error_code, &to->err);
+	err |= __put_user(fi->trap_no, &to->trapno);
+
+	err |= PUTREG(regs, RIP, to, ip);
+	err |= PUTREG(regs, EFLAGS, to, flags);
+#undef PUTREG
+
+	err |= __put_user(mask, &to->oldmask);
+	if (err)
+		return 1;
+
+	err = save_fp_registers(userspace_pid[current_thread_info()->cpu],
+				(unsigned long *) &fp);
+	if (err < 0) {
+		printk(KERN_ERR "copy_sc_from_user - restore_fp_registers "
+		       "failed, errno = %d\n", -err);
+		return 1;
+	}
+
+	if (copy_to_user(to_fp, &fp, sizeof(struct user_i387_struct)))
+		return 1;
+
+	return err;
+}
+
+struct rt_sigframe
+{
+	char __user *pretcode;
+	struct ucontext uc;
+	struct siginfo info;
+	struct _fpstate fpstate;
+};
+
+#define round_down(m, n) (((m) / (n)) * (n))
+
+int setup_signal_stack_si(unsigned long stack_top, int sig,
+			  struct k_sigaction *ka, struct pt_regs * regs,
+			  siginfo_t *info, sigset_t *set)
+{
+	struct rt_sigframe __user *frame;
+	unsigned long save_sp = PT_REGS_RSP(regs);
+	int err = 0;
+	struct task_struct *me = current;
+
+	frame = (struct rt_sigframe __user *)
+		round_down(stack_top - sizeof(struct rt_sigframe), 16);
+	/* Subtract 128 for a red zone and 8 for proper alignment */
+	frame = (struct rt_sigframe __user *) ((unsigned long) frame - 128 - 8);
+
+	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+		goto out;
+
+	if (ka->sa.sa_flags & SA_SIGINFO) {
+		err |= copy_siginfo_to_user(&frame->info, info);
+		if (err)
+			goto out;
+	}
+
+	/*
+	 * Update SP now because the page fault handler refuses to extend
+	 * the stack if the faulting address is too far below the current
+	 * SP, which frame now certainly is.  If there's an error, the original
+	 * value is restored on the way out.
+	 * When writing the sigcontext to the stack, we have to write the
+	 * original value, so that's passed to copy_sc_to_user, which does
+	 * the right thing with it.
+	 */
+	PT_REGS_RSP(regs) = (unsigned long) frame;
+
+	/* Create the ucontext.  */
+	err |= __put_user(0, &frame->uc.uc_flags);
+	err |= __put_user(0, &frame->uc.uc_link);
+	err |= __put_user(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
+	err |= __put_user(sas_ss_flags(save_sp),
+			  &frame->uc.uc_stack.ss_flags);
+	err |= __put_user(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
+	err |= copy_sc_to_user(&frame->uc.uc_mcontext, &frame->fpstate, regs,
+			       set->sig[0], save_sp);
+	err |= __put_user(&frame->fpstate, &frame->uc.uc_mcontext.fpstate);
+	if (sizeof(*set) == 16) {
+		__put_user(set->sig[0], &frame->uc.uc_sigmask.sig[0]);
+		__put_user(set->sig[1], &frame->uc.uc_sigmask.sig[1]);
+	}
+	else
+		err |= __copy_to_user(&frame->uc.uc_sigmask, set,
+				      sizeof(*set));
+
+	/*
+	 * Set up to return from userspace.  If provided, use a stub
+	 * already in userspace.
+	 */
+	/* x86-64 should always use SA_RESTORER. */
+	if (ka->sa.sa_flags & SA_RESTORER)
+		err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
+	else
+		/* could use a vstub here */
+		goto restore_sp;
+
+	if (err)
+		goto restore_sp;
+
+	/* Set up registers for signal handler */
+	{
+		struct exec_domain *ed = current_thread_info()->exec_domain;
+		if (unlikely(ed && ed->signal_invmap && sig < 32))
+			sig = ed->signal_invmap[sig];
+	}
+
+	PT_REGS_RDI(regs) = sig;
+	/* In case the signal handler was declared without prototypes */
+	PT_REGS_RAX(regs) = 0;
+
+	/*
+	 * This also works for non SA_SIGINFO handlers because they expect the
+	 * next argument after the signal number on the stack.
+	 */
+	PT_REGS_RSI(regs) = (unsigned long) &frame->info;
+	PT_REGS_RDX(regs) = (unsigned long) &frame->uc;
+	PT_REGS_RIP(regs) = (unsigned long) ka->sa.sa_handler;
+ out:
+	return err;
+
+restore_sp:
+	PT_REGS_RSP(regs) = save_sp;
+	return err;
+}
+
+long sys_rt_sigreturn(struct pt_regs *regs)
+{
+	unsigned long sp = PT_REGS_SP(&current->thread.regs);
+	struct rt_sigframe __user *frame =
+		(struct rt_sigframe __user *)(sp - 8);
+	struct ucontext __user *uc = &frame->uc;
+	sigset_t set;
+
+	if (copy_from_user(&set, &uc->uc_sigmask, sizeof(set)))
+		goto segfault;
+
+	sigdelsetmask(&set, ~_BLOCKABLE);
+
+	spin_lock_irq(&current->sighand->siglock);
+	current->blocked = set;
+	recalc_sigpending();
+	spin_unlock_irq(&current->sighand->siglock);
+
+	if (copy_sc_from_user(&current->thread.regs, &uc->uc_mcontext,
+			      &frame->fpstate))
+		goto segfault;
+
+	/* Avoid ERESTART handling */
+	PT_REGS_SYSCALL_NR(&current->thread.regs) = -1;
+	return PT_REGS_SYSCALL_RET(&current->thread.regs);
+
+ segfault:
+	force_sig(SIGSEGV, current);
+	return 0;
+}

kernel/arch/um/sys-x86_64/stub.S

@@ -0,0 +1,66 @@
+#include "as-layout.h"
+
+	.globl syscall_stub
+.section .__syscall_stub, "ax"
+syscall_stub:
+	syscall
+	/* We don't have 64-bit constants, so this constructs the address
+	 * we need.
+	 */
+	movq	$(STUB_DATA >> 32), %rbx
+	salq	$32, %rbx
+	movq	$(STUB_DATA & 0xffffffff), %rcx
+	or	%rcx, %rbx
+	movq	%rax, (%rbx)
+	int3
+
+	.globl batch_syscall_stub
+batch_syscall_stub:
+	mov	$(STUB_DATA >> 32), %rbx
+	sal	$32, %rbx
+	mov	$(STUB_DATA & 0xffffffff), %rax
+	or	%rax, %rbx
+	/* load pointer to first operation */
+	mov	%rbx, %rsp
+	add	$0x10, %rsp
+again:
+	/* load length of additional data */
+	mov	0x0(%rsp), %rax
+
+	/* if(length == 0) : end of list */
+	/* write possible 0 to header */
+	mov	%rax, 8(%rbx)
+	cmp	$0, %rax
+	jz	done
+
+	/* save current pointer */
+	mov	%rsp, 8(%rbx)
+
+	/* skip additional data */
+	add	%rax, %rsp
+
+	/* load syscall-# */
+	pop	%rax
+
+	/* load syscall params */
+	pop	%rdi
+	pop	%rsi
+	pop	%rdx
+	pop	%r10
+ 	pop	%r8
+	pop	%r9
+
+	/* execute syscall */
+	syscall
+
+	/* check return value */
+	pop	%rcx
+	cmp	%rcx, %rax
+	je	again
+
+done:
+	/* save return value */
+	mov	%rax, (%rbx)
+
+	/* stop */
+	int3

kernel/arch/um/sys-x86_64/stub_segv.c

@@ -0,0 +1,22 @@
+/*
+ * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Licensed under the GPL
+ */
+
+#include <signal.h>
+#include "as-layout.h"
+#include "sysdep/stub.h"
+#include "sysdep/faultinfo.h"
+#include "sysdep/sigcontext.h"
+
+void __attribute__ ((__section__ (".__syscall_stub")))
+stub_segv_handler(int sig)
+{
+	struct ucontext *uc;
+
+	__asm__ __volatile__("movq %%rdx, %0" : "=g" (uc) :);
+	GET_FAULTINFO_FROM_SC(*((struct faultinfo *) STUB_DATA),
+			      &uc->uc_mcontext);
+	trap_myself();
+}
+

kernel/arch/um/sys-x86_64/syscall_table.c

@@ -0,0 +1,70 @@
+/*
+ * System call table for UML/x86-64, copied from arch/x86_64/kernel/syscall.c
+ * with some changes for UML.
+ */
+
+#include <linux/linkage.h>
+#include <linux/sys.h>
+#include <linux/cache.h>
+#include <kern_constants.h>
+
+#define __NO_STUBS
+
+/*
+ * Below you can see, in terms of #define's, the differences between the x86-64
+ * and the UML syscall table.
+ */
+
+/* Not going to be implemented by UML, since we have no hardware. */
+#define stub_iopl sys_ni_syscall
+#define sys_ioperm sys_ni_syscall
+
+/*
+ * The UML TLS problem. Note that x86_64 does not implement this, so the below
+ * is needed only for the ia32 compatibility.
+ */
+
+/* On UML we call it this way ("old" means it's not mmap2) */
+#define sys_mmap old_mmap
+/*
+ * On x86-64 sys_uname is actually sys_newuname plus a compatibility trick.
+ * See arch/x86_64/kernel/sys_x86_64.c
+ */
+#define sys_uname sys_uname64
+
+#define stub_clone sys_clone
+#define stub_fork sys_fork
+#define stub_vfork sys_vfork
+#define stub_execve sys_execve
+#define stub_rt_sigsuspend sys_rt_sigsuspend
+#define stub_sigaltstack sys_sigaltstack
+#define stub_rt_sigreturn sys_rt_sigreturn
+
+#define __SYSCALL(nr, sym) extern asmlinkage void sym(void) ;
+#undef _ASM_X86_UNISTD_64_H
+#include "../../x86/include/asm/unistd_64.h"
+
+#undef __SYSCALL
+#define __SYSCALL(nr, sym) [ nr ] = sym,
+#undef _ASM_X86_UNISTD_64_H
+
+typedef void (*sys_call_ptr_t)(void);
+
+extern void sys_ni_syscall(void);
+
+/*
+ * We used to have a trick here which made sure that holes in the
+ * x86_64 table were filled in with sys_ni_syscall, but a comment in
+ * unistd_64.h says that holes aren't allowed, so the trick was
+ * removed.
+ * The trick looked like this
+ *	[0 ... UM_NR_syscall_max] = &sys_ni_syscall
+ * before including unistd_64.h - the later initializations overwrote
+ * the sys_ni_syscall filler.
+ */
+
+sys_call_ptr_t sys_call_table[] __cacheline_aligned = {
+#include "../../x86/include/asm/unistd_64.h"
+};
+
+int syscall_table_size = sizeof(sys_call_table);

kernel/arch/um/sys-x86_64/syscalls.c

@@ -0,0 +1,116 @@
+/*
+ * Copyright (C) 2003 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#include "linux/linkage.h"
+#include "linux/personality.h"
+#include "linux/utsname.h"
+#include "asm/prctl.h" /* XXX This should get the constants from libc */
+#include "asm/uaccess.h"
+#include "os.h"
+
+asmlinkage long sys_uname64(struct new_utsname __user * name)
+{
+	int err;
+
+	down_read(&uts_sem);
+	err = copy_to_user(name, utsname(), sizeof (*name));
+	up_read(&uts_sem);
+
+	if (personality(current->personality) == PER_LINUX32)
+		err |= copy_to_user(&name->machine, "i686", 5);
+
+	return err ? -EFAULT : 0;
+}
+
+long arch_prctl(struct task_struct *task, int code, unsigned long __user *addr)
+{
+	unsigned long *ptr = addr, tmp;
+	long ret;
+	int pid = task->mm->context.id.u.pid;
+
+	/*
+	 * With ARCH_SET_FS (and ARCH_SET_GS is treated similarly to
+	 * be safe), we need to call arch_prctl on the host because
+	 * setting %fs may result in something else happening (like a
+	 * GDT or thread.fs being set instead).  So, we let the host
+	 * fiddle the registers and thread struct and restore the
+	 * registers afterwards.
+	 *
+	 * So, the saved registers are stored to the process (this
+	 * needed because a stub may have been the last thing to run),
+	 * arch_prctl is run on the host, then the registers are read
+	 * back.
+	 */
+	switch (code) {
+	case ARCH_SET_FS:
+	case ARCH_SET_GS:
+		ret = restore_registers(pid, &current->thread.regs.regs);
+		if (ret)
+			return ret;
+		break;
+	case ARCH_GET_FS:
+	case ARCH_GET_GS:
+		/*
+		 * With these two, we read to a local pointer and
+		 * put_user it to the userspace pointer that we were
+		 * given.  If addr isn't valid (because it hasn't been
+		 * faulted in or is just bogus), we want put_user to
+		 * fault it in (or return -EFAULT) instead of having
+		 * the host return -EFAULT.
+		 */
+		ptr = &tmp;
+	}
+
+	ret = os_arch_prctl(pid, code, ptr);
+	if (ret)
+		return ret;
+
+	switch (code) {
+	case ARCH_SET_FS:
+		current->thread.arch.fs = (unsigned long) ptr;
+		ret = save_registers(pid, &current->thread.regs.regs);
+		break;
+	case ARCH_SET_GS:
+		ret = save_registers(pid, &current->thread.regs.regs);
+		break;
+	case ARCH_GET_FS:
+		ret = put_user(tmp, addr);
+		break;
+	case ARCH_GET_GS:
+		ret = put_user(tmp, addr);
+		break;
+	}
+
+	return ret;
+}
+
+long sys_arch_prctl(int code, unsigned long addr)
+{
+	return arch_prctl(current, code, (unsigned long __user *) addr);
+}
+
+long sys_clone(unsigned long clone_flags, unsigned long newsp,
+	       void __user *parent_tid, void __user *child_tid)
+{
+	long ret;
+
+	if (!newsp)
+		newsp = UPT_SP(&current->thread.regs.regs);
+	current->thread.forking = 1;
+	ret = do_fork(clone_flags, newsp, &current->thread.regs, 0, parent_tid,
+		      child_tid);
+	current->thread.forking = 0;
+	return ret;
+}
+
+void arch_switch_to(struct task_struct *to)
+{
+	if ((to->thread.arch.fs == 0) || (to->mm == NULL))
+		return;
+
+	arch_prctl(to, ARCH_SET_FS, (void __user *) to->thread.arch.fs);
+}

kernel/arch/um/sys-x86_64/sysrq.c

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/utsname.h>
+#include <asm/current.h>
+#include <asm/ptrace.h>
+#include "sysrq.h"
+
+void __show_regs(struct pt_regs *regs)
+{
+	printk("\n");
+	print_modules();
+	printk(KERN_INFO "Pid: %d, comm: %.20s %s %s\n", task_pid_nr(current),
+		current->comm, print_tainted(), init_utsname()->release);
+	printk(KERN_INFO "RIP: %04lx:[<%016lx>]\n", PT_REGS_CS(regs) & 0xffff,
+	       PT_REGS_RIP(regs));
+	printk(KERN_INFO "RSP: %016lx  EFLAGS: %08lx\n", PT_REGS_RSP(regs),
+	       PT_REGS_EFLAGS(regs));
+	printk(KERN_INFO "RAX: %016lx RBX: %016lx RCX: %016lx\n",
+	       PT_REGS_RAX(regs), PT_REGS_RBX(regs), PT_REGS_RCX(regs));
+	printk(KERN_INFO "RDX: %016lx RSI: %016lx RDI: %016lx\n",
+	       PT_REGS_RDX(regs), PT_REGS_RSI(regs), PT_REGS_RDI(regs));
+	printk(KERN_INFO "RBP: %016lx R08: %016lx R09: %016lx\n",
+	       PT_REGS_RBP(regs), PT_REGS_R8(regs), PT_REGS_R9(regs));
+	printk(KERN_INFO "R10: %016lx R11: %016lx R12: %016lx\n",
+	       PT_REGS_R10(regs), PT_REGS_R11(regs), PT_REGS_R12(regs));
+	printk(KERN_INFO "R13: %016lx R14: %016lx R15: %016lx\n",
+	       PT_REGS_R13(regs), PT_REGS_R14(regs), PT_REGS_R15(regs));
+}
+
+void show_regs(struct pt_regs *regs)
+{
+	__show_regs(regs);
+	show_trace(current, (unsigned long *) &regs);
+}

kernel/arch/um/sys-x86_64/tls.c

@@ -0,0 +1,17 @@
+#include "linux/sched.h"
+
+void clear_flushed_tls(struct task_struct *task)
+{
+}
+
+int arch_copy_tls(struct task_struct *t)
+{
+	/*
+	 * If CLONE_SETTLS is set, we need to save the thread id
+	 * (which is argument 5, child_tid, of clone) so it can be set
+	 * during context switches.
+	 */
+	t->thread.arch.fs = t->thread.regs.regs.gp[R8 / sizeof(long)];
+
+	return 0;
+}

kernel/arch/um/sys-x86_64/user-offsets.c

@@ -0,0 +1,65 @@
+#include <stdio.h>
+#include <stddef.h>
+#include <signal.h>
+#include <sys/poll.h>
+#include <sys/mman.h>
+#include <sys/user.h>
+#define __FRAME_OFFSETS
+#include <asm/ptrace.h>
+#include <asm/types.h>
+
+#define DEFINE(sym, val) \
+        asm volatile("\n->" #sym " %0 " #val : : "i" (val))
+
+#define DEFINE_LONGS(sym, val) \
+        asm volatile("\n->" #sym " %0 " #val : : "i" (val/sizeof(unsigned long)))
+
+#define OFFSET(sym, str, mem) \
+	DEFINE(sym, offsetof(struct str, mem));
+
+void foo(void)
+{
+	OFFSET(HOST_SC_CR2, sigcontext, cr2);
+	OFFSET(HOST_SC_ERR, sigcontext, err);
+	OFFSET(HOST_SC_TRAPNO, sigcontext, trapno);
+
+	DEFINE(HOST_FP_SIZE, sizeof(struct _fpstate) / sizeof(unsigned long));
+	DEFINE_LONGS(HOST_RBX, RBX);
+	DEFINE_LONGS(HOST_RCX, RCX);
+	DEFINE_LONGS(HOST_RDI, RDI);
+	DEFINE_LONGS(HOST_RSI, RSI);
+	DEFINE_LONGS(HOST_RDX, RDX);
+	DEFINE_LONGS(HOST_RBP, RBP);
+	DEFINE_LONGS(HOST_RAX, RAX);
+	DEFINE_LONGS(HOST_R8, R8);
+	DEFINE_LONGS(HOST_R9, R9);
+	DEFINE_LONGS(HOST_R10, R10);
+	DEFINE_LONGS(HOST_R11, R11);
+	DEFINE_LONGS(HOST_R12, R12);
+	DEFINE_LONGS(HOST_R13, R13);
+	DEFINE_LONGS(HOST_R14, R14);
+	DEFINE_LONGS(HOST_R15, R15);
+	DEFINE_LONGS(HOST_ORIG_RAX, ORIG_RAX);
+	DEFINE_LONGS(HOST_CS, CS);
+	DEFINE_LONGS(HOST_SS, SS);
+	DEFINE_LONGS(HOST_EFLAGS, EFLAGS);
+#if 0
+	DEFINE_LONGS(HOST_FS, FS);
+	DEFINE_LONGS(HOST_GS, GS);
+	DEFINE_LONGS(HOST_DS, DS);
+	DEFINE_LONGS(HOST_ES, ES);
+#endif
+
+	DEFINE_LONGS(HOST_IP, RIP);
+	DEFINE_LONGS(HOST_SP, RSP);
+	DEFINE(UM_FRAME_SIZE, sizeof(struct user_regs_struct));
+
+	/* XXX Duplicated between i386 and x86_64 */
+	DEFINE(UM_POLLIN, POLLIN);
+	DEFINE(UM_POLLPRI, POLLPRI);
+	DEFINE(UM_POLLOUT, POLLOUT);
+
+	DEFINE(UM_PROT_READ, PROT_READ);
+	DEFINE(UM_PROT_WRITE, PROT_WRITE);
+	DEFINE(UM_PROT_EXEC, PROT_EXEC);
+}