Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

15 files changed, 1091 insertions, 0 deletions

diff --git a/arch/um/sys-x86_64/Makefile b/arch/um/sys-x86_64/Makefile
new file mode 100644
index 000000000000..2129e3143559
--- /dev/null
+++ b/arch/um/sys-x86_64/Makefile
@@ -0,0 +1,37 @@
+#
+# Copyright 2003 PathScale, Inc.
+#
+# Licensed under the GPL
+#
+
+lib-y = bitops.o bugs.o csum-partial.o delay.o fault.o mem.o memcpy.o \
+	ptrace.o ptrace_user.o semaphore.o sigcontext.o signal.o \
+	syscalls.o sysrq.o thunk.o
+
+USER_OBJS := ptrace_user.o sigcontext.o
+
+include arch/um/scripts/Makefile.rules
+
+SYMLINKS = bitops.c csum-copy.S csum-partial.c csum-wrappers.c memcpy.S \
+	semaphore.c thunk.S
+
+# this needs to be before the foreach, because clean-files does not accept
+# complete paths like $(src)/$f.
+clean-files := $(SYMLINKS)
+
+targets += $(SYMLINKS)
+
+SYMLINKS := $(foreach f,$(SYMLINKS),$(obj)/$f)
+
+bitops.c-dir = lib
+csum-copy.S-dir = lib
+csum-partial.c-dir = lib
+csum-wrappers.c-dir = lib
+memcpy.S-dir = lib
+semaphore.c-dir = kernel
+thunk.S-dir = lib
+
+$(SYMLINKS): FORCE
+	$(call if_changed,make_link)
+
+CFLAGS_csum-partial.o := -Dcsum_partial=arch_csum_partial
diff --git a/arch/um/sys-x86_64/bugs.c b/arch/um/sys-x86_64/bugs.c
new file mode 100644
index 000000000000..fdce7ea98ca7
--- /dev/null
+++ b/arch/um/sys-x86_64/bugs.c
@@ -0,0 +1,122 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#include "linux/sched.h"
+#include "linux/errno.h"
+#include "asm/system.h"
+#include "asm/pda.h"
+#include "sysdep/ptrace.h"
+#include "os.h"
+
+void arch_init_thread(void)
+{
+}
+
+void arch_check_bugs(void)
+{
+}
+
+int arch_handle_signal(int sig, union uml_pt_regs *regs)
+{
+	return(0);
+}
+
+#define MAXTOKEN 64
+
+/* Set during early boot */
+int host_has_cmov = 1;
+int host_has_xmm = 0;
+
+static char token(int fd, char *buf, int len, char stop)
+{
+	int n;
+	char *ptr, *end, c;
+
+	ptr = buf;
+	end = &buf[len];
+	do {
+		n = os_read_file(fd, ptr, sizeof(*ptr));
+		c = *ptr++;
+		if(n != sizeof(*ptr)){
+			if(n == 0) return(0);
+			printk("Reading /proc/cpuinfo failed, err = %d\n", -n);
+			if(n < 0)
+				return(n);
+			else
+				return(-EIO);
+		}
+	} while((c != '\n') && (c != stop) && (ptr < end));
+
+	if(ptr == end){
+		printk("Failed to find '%c' in /proc/cpuinfo\n", stop);
+		return(-1);
+	}
+	*(ptr - 1) = '\0';
+	return(c);
+}
+
+static int find_cpuinfo_line(int fd, char *key, char *scratch, int len)
+{
+	int n;
+	char c;
+
+	scratch[len - 1] = '\0';
+	while(1){
+		c = token(fd, scratch, len - 1, ':');
+		if(c <= 0)
+			return(0);
+		else if(c != ':'){
+			printk("Failed to find ':' in /proc/cpuinfo\n");
+			return(0);
+		}
+
+		if(!strncmp(scratch, key, strlen(key)))
+			return(1);
+
+		do {
+			n = os_read_file(fd, &c, sizeof(c));
+			if(n != sizeof(c)){
+				printk("Failed to find newline in "
+				       "/proc/cpuinfo, err = %d\n", -n);
+				return(0);
+			}
+		} while(c != '\n');
+	}
+	return(0);
+}
+
+int cpu_feature(char *what, char *buf, int len)
+{
+	int fd, ret = 0;
+
+	fd = os_open_file("/proc/cpuinfo", of_read(OPENFLAGS()), 0);
+	if(fd < 0){
+		printk("Couldn't open /proc/cpuinfo, err = %d\n", -fd);
+		return(0);
+	}
+
+	if(!find_cpuinfo_line(fd, what, buf, len)){
+		printk("Couldn't find '%s' line in /proc/cpuinfo\n", what);
+		goto out_close;
+	}
+
+	token(fd, buf, len, '\n');
+	ret = 1;
+
+ out_close:
+	os_close_file(fd);
+	return(ret);
+}
+
+/* Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/sys-x86_64/delay.c b/arch/um/sys-x86_64/delay.c
new file mode 100644
index 000000000000..f3b5187942b4
--- /dev/null
+++ b/arch/um/sys-x86_64/delay.c
@@ -0,0 +1,26 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ * Copied from arch/x86_64
+ *
+ * Licensed under the GPL
+ */
+
+#include "asm/processor.h"
+
+void __delay(unsigned long loops)
+{
+	unsigned long i;
+
+	for(i = 0; i < loops; i++) ;
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/sys-x86_64/fault.c b/arch/um/sys-x86_64/fault.c
new file mode 100644
index 000000000000..cee1513c5c31
--- /dev/null
+++ b/arch/um/sys-x86_64/fault.c
@@ -0,0 +1,23 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#include "user.h"
+
+int arch_fixup(unsigned long address, void *sc_ptr)
+{
+	/* XXX search_exception_tables() */
+	return(0);
+}
+
+/* Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/sys-x86_64/mem.c b/arch/um/sys-x86_64/mem.c
new file mode 100644
index 000000000000..3f59a0a4f156
--- /dev/null
+++ b/arch/um/sys-x86_64/mem.c
@@ -0,0 +1,25 @@
+/*
+ * 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;
+
+/* Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/sys-x86_64/ptrace.c b/arch/um/sys-x86_64/ptrace.c
new file mode 100644
index 000000000000..8c146b2a1e00
--- /dev/null
+++ b/arch/um/sys-x86_64/ptrace.c
@@ -0,0 +1,138 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#define __FRAME_OFFSETS
+#include "asm/ptrace.h"
+#include "linux/sched.h"
+#include "linux/errno.h"
+#include "asm/elf.h"
+
+/* XXX x86_64 */
+unsigned long not_ss;
+unsigned long not_ds;
+unsigned long not_es;
+
+#define SC_SS(r) (not_ss)
+#define SC_DS(r) (not_ds)
+#define SC_ES(r) (not_es)
+
+/* 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;
+}
+
+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;
+}
+
+void arch_switch(void)
+{
+/* XXX
+	printk("arch_switch\n");
+*/
+}
+
+int is_syscall(unsigned long addr)
+{
+	panic("is_syscall");
+}
+
+int dump_fpu(struct pt_regs *regs, elf_fpregset_t *fpu )
+{
+	panic("dump_fpu");
+	return(1);
+}
+
+int get_fpregs(unsigned long buf, struct task_struct *child)
+{
+	panic("get_fpregs");
+	return(0);
+}
+
+int set_fpregs(unsigned long buf, struct task_struct *child)
+{
+	panic("set_fpregs");
+	return(0);
+}
+
+int get_fpxregs(unsigned long buf, struct task_struct *tsk)
+{
+	panic("get_fpxregs");
+	return(0);
+}
+
+int set_fpxregs(unsigned long buf, struct task_struct *tsk)
+{
+	panic("set_fxpregs");
+	return(0);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/sys-x86_64/ptrace_user.c b/arch/um/sys-x86_64/ptrace_user.c
new file mode 100644
index 000000000000..12e404c6fa46
--- /dev/null
+++ b/arch/um/sys-x86_64/ptrace_user.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#include <stddef.h>
+#include <errno.h>
+#include "ptrace_user.h"
+#include "user.h"
+#include "kern_constants.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)
+{
+	if(ptrace(PTRACE_SETREGS, pid, 0, regs) < 0)
+		return(-errno);
+	return(0);
+}
+
+void ptrace_pokeuser(unsigned long addr, unsigned long data)
+{
+	panic("ptrace_pokeuser");
+}
+
+#define DS 184
+#define ES 192
+#define __USER_DS     0x2b
+
+void arch_enter_kernel(void *task, int pid)
+{
+}
+
+void arch_leave_kernel(void *task, int pid)
+{
+#ifdef UM_USER_CS
+        if(ptrace(PTRACE_POKEUSR, pid, CS, UM_USER_CS) < 0)
+                printk("POKEUSR CS failed");
+#endif
+
+        if(ptrace(PTRACE_POKEUSR, pid, DS, __USER_DS) < 0)
+                printk("POKEUSR DS failed");
+        if(ptrace(PTRACE_POKEUSR, pid, ES, __USER_DS) < 0)
+                printk("POKEUSR ES failed");
+}
diff --git a/arch/um/sys-x86_64/sigcontext.c b/arch/um/sys-x86_64/sigcontext.c
new file mode 100644
index 000000000000..c88e64def6f2
--- /dev/null
+++ b/arch/um/sys-x86_64/sigcontext.c
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <signal.h>
+#include "user.h"
+
+void sc_to_sc(void *to_ptr, void *from_ptr)
+{
+        struct sigcontext *to = to_ptr, *from = from_ptr;
+        int size = sizeof(*to); /* + sizeof(struct _fpstate); */
+
+        memcpy(to, from, size);
+        if(from->fpstate != NULL)
+		to->fpstate = (struct _fpstate *) (to + 1);
+
+	to->fpstate = NULL;
+}
+
+unsigned long *sc_sigmask(void *sc_ptr)
+{
+	struct sigcontext *sc = sc_ptr;
+
+	return(&sc->oldmask);
+}
+
+/* Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/sys-x86_64/signal.c b/arch/um/sys-x86_64/signal.c
new file mode 100644
index 000000000000..5bc5a0d796e5
--- /dev/null
+++ b/arch/um/sys-x86_64/signal.c
@@ -0,0 +1,276 @@
+/*
+ * Copyright (C) 2003 PathScale, Inc.
+ * Licensed under the GPL
+ */
+
+#include "linux/stddef.h"
+#include "linux/errno.h"
+#include "linux/personality.h"
+#include "linux/ptrace.h"
+#include "asm/current.h"
+#include "asm/uaccess.h"
+#include "asm/sigcontext.h"
+#include "asm/ptrace.h"
+#include "asm/arch/ucontext.h"
+#include "choose-mode.h"
+#include "sysdep/ptrace.h"
+#include "frame_kern.h"
+
+#ifdef CONFIG_MODE_SKAS
+
+#include "skas.h"
+
+static int copy_sc_from_user_skas(struct pt_regs *regs,
+                                 struct sigcontext *from)
+{
+       int err = 0;
+
+#define GETREG(regs, regno, sc, regname) \
+       __get_user((regs)->regs.skas.regs[(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, rdi);
+       err |= GETREG(regs, RSI, from, rsi);
+       err |= GETREG(regs, RBP, from, rbp);
+       err |= GETREG(regs, RBX, from, rbx);
+       err |= GETREG(regs, RDX, from, rdx);
+       err |= GETREG(regs, RAX, from, rax);
+       err |= GETREG(regs, RCX, from, rcx);
+       err |= GETREG(regs, RSP, from, rsp);
+       err |= GETREG(regs, RIP, from, rip);
+       err |= GETREG(regs, EFLAGS, from, eflags);
+       err |= GETREG(regs, CS, from, cs);
+
+#undef GETREG
+
+       return(err);
+}
+
+int copy_sc_to_user_skas(struct sigcontext *to, struct _fpstate *to_fp,
+                        struct pt_regs *regs, unsigned long mask)
+{
+	unsigned long eflags;
+	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.skas.regs[(regno) / sizeof(unsigned long)], \
+                  &(sc)->regname)
+
+	err |= PUTREG(regs, RDI, to, rdi);
+	err |= PUTREG(regs, RSI, to, rsi);
+	err |= PUTREG(regs, RBP, to, rbp);
+	err |= PUTREG(regs, RSP, to, rsp);
+	err |= PUTREG(regs, RBX, to, rbx);
+	err |= PUTREG(regs, RDX, to, rdx);
+	err |= PUTREG(regs, RCX, to, rcx);
+	err |= PUTREG(regs, RAX, to, rax);
+	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(current->thread.err, &to->err);
+	err |= __put_user(current->thread.trap_no, &to->trapno);
+	err |= PUTREG(regs, RIP, to, rip);
+	err |= PUTREG(regs, EFLAGS, to, eflags);
+#undef PUTREG
+
+	err |= __put_user(mask, &to->oldmask);
+	err |= __put_user(current->thread.cr2, &to->cr2);
+
+	return(err);
+}
+
+#endif
+
+#ifdef CONFIG_MODE_TT
+int copy_sc_from_user_tt(struct sigcontext *to, struct sigcontext *from,
+                        int fpsize)
+{
+       struct _fpstate *to_fp, *from_fp;
+       unsigned long sigs;
+       int err;
+
+       to_fp = to->fpstate;
+       from_fp = from->fpstate;
+       sigs = to->oldmask;
+       err = copy_from_user(to, from, sizeof(*to));
+       to->oldmask = sigs;
+       return(err);
+}
+
+int copy_sc_to_user_tt(struct sigcontext *to, struct _fpstate *fp,
+                      struct sigcontext *from, int fpsize)
+{
+       struct _fpstate *to_fp, *from_fp;
+       int err;
+
+       to_fp = (fp ? fp : (struct _fpstate *) (to + 1));
+       from_fp = from->fpstate;
+       err = copy_to_user(to, from, sizeof(*to));
+       return(err);
+}
+
+#endif
+
+static int copy_sc_from_user(struct pt_regs *to, void __user *from)
+{
+       int ret;
+
+       ret = CHOOSE_MODE(copy_sc_from_user_tt(UPT_SC(&to->regs), from,
+                                              sizeof(struct _fpstate)),
+                         copy_sc_from_user_skas(to, from));
+       return(ret);
+}
+
+static int copy_sc_to_user(struct sigcontext *to, struct _fpstate *fp,
+                          struct pt_regs *from, unsigned long mask)
+{
+       return(CHOOSE_MODE(copy_sc_to_user_tt(to, fp, UPT_SC(&from->regs),
+                                             sizeof(*fp)),
+                          copy_sc_to_user_skas(to, fp, from, mask)));
+}
+
+struct rt_sigframe
+{
+       char *pretcode;
+       struct ucontext uc;
+       struct siginfo info;
+};
+
+#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;
+	struct _fpstate __user *fp = NULL;
+	int err = 0;
+	struct task_struct *me = current;
+
+	frame = (struct rt_sigframe __user *)
+		round_down(stack_top - sizeof(struct rt_sigframe), 16) - 8;
+	frame -= 128;
+
+	if (!access_ok(VERIFY_WRITE, fp, sizeof(struct _fpstate)))
+		goto out;
+
+#if 0 /* XXX */
+	if (save_i387(fp) < 0)
+		err |= -1;
+#endif
+	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;
+	}
+
+	/* 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(PT_REGS_SP(regs)),
+			  &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, fp, regs, set->sig[0]);
+	err |= __put_user(fp, &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 out;
+
+	if (err)
+		goto out;
+
+	/* 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;
+
+	PT_REGS_RSP(regs) = (unsigned long) frame;
+ out:
+	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))
+		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;
+}
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/sys-x86_64/syscalls.c b/arch/um/sys-x86_64/syscalls.c
new file mode 100644
index 000000000000..68205a03364c
--- /dev/null
+++ b/arch/um/sys-x86_64/syscalls.c
@@ -0,0 +1,186 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#include "linux/linkage.h"
+#include "linux/slab.h"
+#include "linux/shm.h"
+#include "asm/uaccess.h"
+#define __FRAME_OFFSETS
+#include "asm/ptrace.h"
+#include "asm/unistd.h"
+#include "asm/prctl.h" /* XXX This should get the constants from libc */
+#include "choose-mode.h"
+
+asmlinkage long wrap_sys_shmat(int shmid, char __user *shmaddr, int shmflg)
+{
+	unsigned long raddr;
+
+	return do_shmat(shmid, shmaddr, shmflg, &raddr) ?: (long) raddr;
+}
+
+#ifdef CONFIG_MODE_TT
+extern int modify_ldt(int func, void *ptr, unsigned long bytecount);
+
+long sys_modify_ldt_tt(int func, void *ptr, unsigned long bytecount)
+{
+	/* XXX This should check VERIFY_WRITE depending on func, check this
+	 * in i386 as well.
+	 */
+	if (!access_ok(VERIFY_READ, ptr, bytecount))
+		return -EFAULT;
+	return(modify_ldt(func, ptr, bytecount));
+}
+#endif
+
+#ifdef CONFIG_MODE_SKAS
+extern int userspace_pid[];
+
+long sys_modify_ldt_skas(int func, void *ptr, unsigned long bytecount)
+{
+	struct ptrace_ldt ldt;
+        void *buf;
+        int res, n;
+
+        buf = kmalloc(bytecount, GFP_KERNEL);
+        if(buf == NULL)
+                return(-ENOMEM);
+
+        res = 0;
+
+        switch(func){
+        case 1:
+        case 0x11:
+                res = copy_from_user(buf, ptr, bytecount);
+                break;
+        }
+
+        if(res != 0){
+                res = -EFAULT;
+                goto out;
+        }
+
+	ldt = ((struct ptrace_ldt) { .func	= func,
+				     .ptr	= buf,
+				     .bytecount = bytecount });
+#warning Need to look up userspace_pid by cpu
+	res = ptrace(PTRACE_LDT, userspace_pid[0], 0, (unsigned long) &ldt);
+        if(res < 0)
+                goto out;
+
+        switch(func){
+        case 0:
+        case 2:
+                n = res;
+                res = copy_to_user(ptr, buf, n);
+                if(res != 0)
+                        res = -EFAULT;
+                else
+                        res = n;
+                break;
+        }
+
+ out:
+        kfree(buf);
+        return(res);
+}
+#endif
+
+long sys_modify_ldt(int func, void *ptr, unsigned long bytecount)
+{
+        return(CHOOSE_MODE_PROC(sys_modify_ldt_tt, sys_modify_ldt_skas, func,
+                                ptr, bytecount));
+}
+
+#ifdef CONFIG_MODE_TT
+extern long arch_prctl(int code, unsigned long addr);
+
+static long arch_prctl_tt(int code, unsigned long addr)
+{
+	unsigned long tmp;
+	long ret;
+
+	switch(code){
+	case ARCH_SET_GS:
+	case ARCH_SET_FS:
+		ret = arch_prctl(code, addr);
+		break;
+	case ARCH_GET_FS:
+	case ARCH_GET_GS:
+		ret = arch_prctl(code, (unsigned long) &tmp);
+		if(!ret)
+			ret = put_user(tmp, &addr);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return(ret);
+}
+#endif
+
+#ifdef CONFIG_MODE_SKAS
+
+static long arch_prctl_skas(int code, unsigned long addr)
+{
+	long ret = 0;
+
+	switch(code){
+	case ARCH_SET_GS:
+		current->thread.regs.regs.skas.regs[GS_BASE / sizeof(unsigned long)] = addr;
+		break;
+	case ARCH_SET_FS:
+		current->thread.regs.regs.skas.regs[FS_BASE / sizeof(unsigned long)] = addr;
+		break;
+	case ARCH_GET_FS:
+		ret = put_user(current->thread.regs.regs.skas.regs[GS / sizeof(unsigned long)], &addr);
+	        break;
+	case ARCH_GET_GS:
+		ret = put_user(current->thread.regs.regs.skas.regs[FS / sizeof(unsigned \
+long)], &addr);
+	        break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return(ret);
+}
+#endif
+
+long sys_arch_prctl(int code, unsigned long addr)
+{
+	return(CHOOSE_MODE_PROC(arch_prctl_tt, arch_prctl_skas, code, addr));
+}
+
+long sys_clone(unsigned long clone_flags, unsigned long newsp,
+	       void __user *parent_tid, void __user *child_tid)
+{
+	long ret;
+
+	/* XXX: normal arch do here this pass, and also pass the regs to
+	 * do_fork, instead of NULL. Currently the arch-independent code
+	 * ignores these values, while the UML code (actually it's
+	 * copy_thread) does the right thing. But this should change,
+	 probably. */
+	/*if (!newsp)
+		newsp = UPT_SP(current->thread.regs);*/
+	current->thread.forking = 1;
+	ret = do_fork(clone_flags, newsp, NULL, 0, parent_tid, child_tid);
+	current->thread.forking = 0;
+	return(ret);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/sys-x86_64/sysrq.c b/arch/um/sys-x86_64/sysrq.c
new file mode 100644
index 000000000000..ddf74691a610
--- /dev/null
+++ b/arch/um/sys-x86_64/sysrq.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#include "linux/kernel.h"
+#include "linux/utsname.h"
+#include "linux/module.h"
+#include "asm/current.h"
+#include "asm/ptrace.h"
+#include "sysrq.h"
+
+void __show_regs(struct pt_regs * regs)
+{
+	printk("\n");
+	print_modules();
+	printk("Pid: %d, comm: %.20s %s %s\n",
+	       current->pid, current->comm, print_tainted(), system_utsname.release);
+	printk("RIP: %04lx:[<%016lx>] ", PT_REGS_CS(regs) & 0xffff,
+	       PT_REGS_RIP(regs));
+	printk("\nRSP: %016lx  EFLAGS: %08lx\n", PT_REGS_RSP(regs),
+	       PT_REGS_EFLAGS(regs));
+	printk("RAX: %016lx RBX: %016lx RCX: %016lx\n",
+	       PT_REGS_RAX(regs), PT_REGS_RBX(regs), PT_REGS_RCX(regs));
+	printk("RDX: %016lx RSI: %016lx RDI: %016lx\n",
+	       PT_REGS_RDX(regs), PT_REGS_RSI(regs), PT_REGS_RDI(regs));
+	printk("RBP: %016lx R08: %016lx R09: %016lx\n",
+	       PT_REGS_RBP(regs), PT_REGS_R8(regs), PT_REGS_R9(regs));
+	printk("R10: %016lx R11: %016lx R12: %016lx\n",
+	       PT_REGS_R10(regs), PT_REGS_R11(regs), PT_REGS_R12(regs));
+	printk("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((unsigned long *) &regs);
+}
+
+/* Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
diff --git a/arch/um/sys-x86_64/util/Makefile b/arch/um/sys-x86_64/util/Makefile
new file mode 100644
index 000000000000..002607980864
--- /dev/null
+++ b/arch/um/sys-x86_64/util/Makefile
@@ -0,0 +1,10 @@
+# Copyright 2003 - 2004 Pathscale, Inc
+# Released under the GPL
+
+hostprogs-y	:= mk_sc mk_thread
+always		:= $(hostprogs-y)
+
+mk_thread-objs	:= mk_thread_kern.o mk_thread_user.o
+
+HOSTCFLAGS_mk_thread_kern.o	:= $(CFLAGS) $(CPPFLAGS)
+HOSTCFLAGS_mk_thread_user.o	:= $(USER_CFLAGS)
diff --git a/arch/um/sys-x86_64/util/mk_sc.c b/arch/um/sys-x86_64/util/mk_sc.c
new file mode 100644
index 000000000000..c236e213918d
--- /dev/null
+++ b/arch/um/sys-x86_64/util/mk_sc.c
@@ -0,0 +1,58 @@
+/* Copyright (C) 2003 - 2004 PathScale, Inc
+ * Released under the GPL
+ */
+
+#include <stdio.h>
+#include <signal.h>
+#include <linux/stddef.h>
+
+#define SC_OFFSET(name, field) \
+  printf("#define " name \
+	 "(sc) *((unsigned long *) &(((char *) (sc))[%ld]))\n",\
+	 offsetof(struct sigcontext, field))
+
+#define SC_FP_OFFSET(name, field) \
+  printf("#define " name \
+	 "(sc) *((unsigned long *) &(((char *) (SC_FPSTATE(sc)))[%ld]))\n",\
+	 offsetof(struct _fpstate, field))
+
+#define SC_FP_OFFSET_PTR(name, field, type) \
+  printf("#define " name \
+	 "(sc) ((" type " *) &(((char *) (SC_FPSTATE(sc)))[%d]))\n",\
+	 offsetof(struct _fpstate, field))
+
+int main(int argc, char **argv)
+{
+  SC_OFFSET("SC_RBX", rbx);
+  SC_OFFSET("SC_RCX", rcx);
+  SC_OFFSET("SC_RDX", rdx);
+  SC_OFFSET("SC_RSI", rsi);
+  SC_OFFSET("SC_RDI", rdi);
+  SC_OFFSET("SC_RBP", rbp);
+  SC_OFFSET("SC_RAX", rax);
+  SC_OFFSET("SC_R8", r8);
+  SC_OFFSET("SC_R9", r9);
+  SC_OFFSET("SC_R10", r10);
+  SC_OFFSET("SC_R11", r11);
+  SC_OFFSET("SC_R12", r12);
+  SC_OFFSET("SC_R13", r13);
+  SC_OFFSET("SC_R14", r14);
+  SC_OFFSET("SC_R15", r15);
+  SC_OFFSET("SC_IP", rip);
+  SC_OFFSET("SC_SP", rsp);
+  SC_OFFSET("SC_CR2", cr2);
+  SC_OFFSET("SC_ERR", err);
+  SC_OFFSET("SC_TRAPNO", trapno);
+  SC_OFFSET("SC_CS", cs);
+  SC_OFFSET("SC_FS", fs);
+  SC_OFFSET("SC_GS", gs);
+  SC_OFFSET("SC_EFLAGS", eflags);
+  SC_OFFSET("SC_SIGMASK", oldmask);
+#if 0
+  SC_OFFSET("SC_ORIG_RAX", orig_rax);
+  SC_OFFSET("SC_DS", ds);
+  SC_OFFSET("SC_ES", es);
+  SC_OFFSET("SC_SS", ss);
+#endif
+  return(0);
+}
diff --git a/arch/um/sys-x86_64/util/mk_thread_kern.c b/arch/um/sys-x86_64/util/mk_thread_kern.c
new file mode 100644
index 000000000000..a281673f02b2
--- /dev/null
+++ b/arch/um/sys-x86_64/util/mk_thread_kern.c
@@ -0,0 +1,21 @@
+#include "linux/config.h"
+#include "linux/stddef.h"
+#include "linux/sched.h"
+
+extern void print_head(void);
+extern void print_constant_ptr(char *name, int value);
+extern void print_constant(char *name, char *type, int value);
+extern void print_tail(void);
+
+#define THREAD_OFFSET(field) offsetof(struct task_struct, thread.field)
+
+int main(int argc, char **argv)
+{
+  print_head();
+#ifdef CONFIG_MODE_TT
+  print_constant("TASK_EXTERN_PID", "int", THREAD_OFFSET(mode.tt.extern_pid));
+#endif
+  print_tail();
+  return(0);
+}
+
diff --git a/arch/um/sys-x86_64/util/mk_thread_user.c b/arch/um/sys-x86_64/util/mk_thread_user.c
new file mode 100644
index 000000000000..7989725568b8
--- /dev/null
+++ b/arch/um/sys-x86_64/util/mk_thread_user.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+
+void print_head(void)
+{
+  printf("/*\n");
+  printf(" * Generated by mk_thread\n");
+  printf(" */\n");
+  printf("\n");
+  printf("#ifndef __UM_THREAD_H\n");
+  printf("#define __UM_THREAD_H\n");
+  printf("\n");
+}
+
+void print_constant_ptr(char *name, int value)
+{
+  printf("#define %s(task) ((unsigned long *) "
+	 "&(((char *) (task))[%d]))\n", name, value);
+}
+
+void print_constant(char *name, char *type, int value)
+{
+  printf("#define %s(task) *((%s *) &(((char *) (task))[%d]))\n", name, type,
+	 value);
+}
+
+void print_tail(void)
+{
+  printf("\n");
+  printf("#endif\n");
+}