Linux-2.6.12-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!
diff --git a/arch/um/kernel/skas/Makefile b/arch/um/kernel/skas/Makefile
new file mode 100644
index 0000000..d37d1bf
--- /dev/null
+++ b/arch/um/kernel/skas/Makefile
@@ -0,0 +1,13 @@
+#
+# Copyright (C) 2002 - 2004 Jeff Dike (jdike@addtoit.com)
+# Licensed under the GPL
+#
+
+obj-y := exec_kern.o mem.o mem_user.o mmu.o process.o process_kern.o \
+ syscall_kern.o syscall_user.o time.o tlb.o trap_user.o uaccess.o \
+
+subdir- := util
+
+USER_OBJS := process.o time.o
+
+include arch/um/scripts/Makefile.rules
diff --git a/arch/um/kernel/skas/exec_kern.c b/arch/um/kernel/skas/exec_kern.c
new file mode 100644
index 0000000..c6b4d5d
--- /dev/null
+++ b/arch/um/kernel/skas/exec_kern.c
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/kernel.h"
+#include "asm/current.h"
+#include "asm/page.h"
+#include "asm/signal.h"
+#include "asm/ptrace.h"
+#include "asm/uaccess.h"
+#include "asm/mmu_context.h"
+#include "tlb.h"
+#include "skas.h"
+#include "um_mmu.h"
+#include "os.h"
+
+void flush_thread_skas(void)
+{
+ force_flush_all();
+ switch_mm_skas(current->mm->context.skas.mm_fd);
+}
+
+void start_thread_skas(struct pt_regs *regs, unsigned long eip,
+ unsigned long esp)
+{
+ set_fs(USER_DS);
+ PT_REGS_IP(regs) = eip;
+ PT_REGS_SP(regs) = esp;
+}
+
+/*
+ * 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/kernel/skas/include/mmu-skas.h b/arch/um/kernel/skas/include/mmu-skas.h
new file mode 100644
index 0000000..4cd60d7
--- /dev/null
+++ b/arch/um/kernel/skas/include/mmu-skas.h
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SKAS_MMU_H
+#define __SKAS_MMU_H
+
+struct mmu_context_skas {
+ int mm_fd;
+};
+
+#endif
+
+/*
+ * 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/kernel/skas/include/mode-skas.h b/arch/um/kernel/skas/include/mode-skas.h
new file mode 100644
index 0000000..c1e33bd
--- /dev/null
+++ b/arch/um/kernel/skas/include/mode-skas.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __MODE_SKAS_H__
+#define __MODE_SKAS_H__
+
+#include <sysdep/ptrace.h>
+
+extern unsigned long exec_regs[];
+extern unsigned long exec_fp_regs[];
+extern unsigned long exec_fpx_regs[];
+extern int have_fpx_regs;
+
+extern void user_time_init_skas(void);
+extern void sig_handler_common_skas(int sig, void *sc_ptr);
+extern void halt_skas(void);
+extern void reboot_skas(void);
+extern void kill_off_processes_skas(void);
+extern int is_skas_winch(int pid, int fd, void *data);
+
+#endif
+
+/*
+ * 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/kernel/skas/include/mode_kern-skas.h b/arch/um/kernel/skas/include/mode_kern-skas.h
new file mode 100644
index 0000000..94c5649
--- /dev/null
+++ b/arch/um/kernel/skas/include/mode_kern-skas.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SKAS_MODE_KERN_H__
+#define __SKAS_MODE_KERN_H__
+
+#include "linux/sched.h"
+#include "asm/page.h"
+#include "asm/ptrace.h"
+
+extern void flush_thread_skas(void);
+extern void *switch_to_skas(void *prev, void *next);
+extern void start_thread_skas(struct pt_regs *regs, unsigned long eip,
+ unsigned long esp);
+extern int copy_thread_skas(int nr, unsigned long clone_flags,
+ unsigned long sp, unsigned long stack_top,
+ struct task_struct *p, struct pt_regs *regs);
+extern void release_thread_skas(struct task_struct *task);
+extern void exit_thread_skas(void);
+extern void initial_thread_cb_skas(void (*proc)(void *), void *arg);
+extern void init_idle_skas(void);
+extern void flush_tlb_kernel_range_skas(unsigned long start,
+ unsigned long end);
+extern void flush_tlb_kernel_vm_skas(void);
+extern void __flush_tlb_one_skas(unsigned long addr);
+extern void flush_tlb_range_skas(struct vm_area_struct *vma,
+ unsigned long start, unsigned long end);
+extern void flush_tlb_mm_skas(struct mm_struct *mm);
+extern void force_flush_all_skas(void);
+extern long execute_syscall_skas(void *r);
+extern void before_mem_skas(unsigned long unused);
+extern unsigned long set_task_sizes_skas(int arg, unsigned long *host_size_out,
+ unsigned long *task_size_out);
+extern int start_uml_skas(void);
+extern int external_pid_skas(struct task_struct *task);
+extern int thread_pid_skas(struct task_struct *task);
+
+#define kmem_end_skas (host_task_size - 1024 * 1024)
+
+#endif
+
+/*
+ * 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/kernel/skas/include/proc_mm.h b/arch/um/kernel/skas/include/proc_mm.h
new file mode 100644
index 0000000..cce61a6
--- /dev/null
+++ b/arch/um/kernel/skas/include/proc_mm.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SKAS_PROC_MM_H
+#define __SKAS_PROC_MM_H
+
+#define MM_MMAP 54
+#define MM_MUNMAP 55
+#define MM_MPROTECT 56
+#define MM_COPY_SEGMENTS 57
+
+struct mm_mmap {
+ unsigned long addr;
+ unsigned long len;
+ unsigned long prot;
+ unsigned long flags;
+ unsigned long fd;
+ unsigned long offset;
+};
+
+struct mm_munmap {
+ unsigned long addr;
+ unsigned long len;
+};
+
+struct mm_mprotect {
+ unsigned long addr;
+ unsigned long len;
+ unsigned int prot;
+};
+
+struct proc_mm_op {
+ int op;
+ union {
+ struct mm_mmap mmap;
+ struct mm_munmap munmap;
+ struct mm_mprotect mprotect;
+ int copy_segments;
+ } u;
+};
+
+#endif
+
+/*
+ * 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/kernel/skas/include/skas.h b/arch/um/kernel/skas/include/skas.h
new file mode 100644
index 0000000..f0702c2
--- /dev/null
+++ b/arch/um/kernel/skas/include/skas.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SKAS_H
+#define __SKAS_H
+
+#include "sysdep/ptrace.h"
+
+extern int userspace_pid[];
+
+extern void switch_threads(void *me, void *next);
+extern void thread_wait(void *sw, void *fb);
+extern void new_thread(void *stack, void **switch_buf_ptr, void **fork_buf_ptr,
+ void (*handler)(int));
+extern int start_idle_thread(void *stack, void *switch_buf_ptr,
+ void **fork_buf_ptr);
+extern int user_thread(unsigned long stack, int flags);
+extern void userspace(union uml_pt_regs *regs);
+extern void new_thread_proc(void *stack, void (*handler)(int sig));
+extern void remove_sigstack(void);
+extern void new_thread_handler(int sig);
+extern void handle_syscall(union uml_pt_regs *regs);
+extern void map(int fd, unsigned long virt, unsigned long len, int r, int w,
+ int x, int phys_fd, unsigned long long offset);
+extern int unmap(int fd, void *addr, unsigned long len);
+extern int protect(int fd, unsigned long addr, unsigned long len,
+ int r, int w, int x);
+extern void user_signal(int sig, union uml_pt_regs *regs);
+extern int new_mm(int from);
+extern void start_userspace(int cpu);
+extern long execute_syscall_skas(void *r);
+
+#endif
+
+/*
+ * 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/kernel/skas/include/uaccess-skas.h b/arch/um/kernel/skas/include/uaccess-skas.h
new file mode 100644
index 0000000..11986c9
--- /dev/null
+++ b/arch/um/kernel/skas/include/uaccess-skas.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SKAS_UACCESS_H
+#define __SKAS_UACCESS_H
+
+#include "asm/errno.h"
+#include "asm/fixmap.h"
+
+#define access_ok_skas(type, addr, size) \
+ ((segment_eq(get_fs(), KERNEL_DS)) || \
+ (((unsigned long) (addr) < TASK_SIZE) && \
+ ((unsigned long) (addr) + (size) <= TASK_SIZE)) || \
+ ((type == VERIFY_READ ) && \
+ ((unsigned long) (addr) >= FIXADDR_USER_START) && \
+ ((unsigned long) (addr) + (size) <= FIXADDR_USER_END) && \
+ ((unsigned long) (addr) + (size) >= (unsigned long)(addr))))
+
+static inline int verify_area_skas(int type, const void * addr,
+ unsigned long size)
+{
+ return(access_ok_skas(type, addr, size) ? 0 : -EFAULT);
+}
+
+extern int copy_from_user_skas(void *to, const void *from, int n);
+extern int copy_to_user_skas(void *to, const void *from, int n);
+extern int strncpy_from_user_skas(char *dst, const char *src, int count);
+extern int __clear_user_skas(void *mem, int len);
+extern int clear_user_skas(void *mem, int len);
+extern int strnlen_user_skas(const void *str, int len);
+
+#endif
+
+/*
+ * 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/kernel/skas/mem.c b/arch/um/kernel/skas/mem.c
new file mode 100644
index 0000000..438db2f
--- /dev/null
+++ b/arch/um/kernel/skas/mem.c
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/config.h"
+#include "linux/mm.h"
+#include "mem_user.h"
+
+unsigned long set_task_sizes_skas(int arg, unsigned long *host_size_out,
+ unsigned long *task_size_out)
+{
+ /* Round up to the nearest 4M */
+ unsigned long top = ROUND_4M((unsigned long) &arg);
+
+#ifdef CONFIG_HOST_TASK_SIZE
+ *host_size_out = CONFIG_HOST_TASK_SIZE;
+ *task_size_out = CONFIG_HOST_TASK_SIZE;
+#else
+ *host_size_out = top;
+ *task_size_out = top;
+#endif
+ return(((unsigned long) set_task_sizes_skas) & ~0xffffff);
+}
+
+/*
+ * 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/kernel/skas/mem_user.c b/arch/um/kernel/skas/mem_user.c
new file mode 100644
index 0000000..1310bf1
--- /dev/null
+++ b/arch/um/kernel/skas/mem_user.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <errno.h>
+#include <sys/mman.h>
+#include "mem_user.h"
+#include "mem.h"
+#include "user.h"
+#include "os.h"
+#include "proc_mm.h"
+
+void map(int fd, unsigned long virt, unsigned long len, int r, int w,
+ int x, int phys_fd, unsigned long long offset)
+{
+ struct proc_mm_op map;
+ int prot, n;
+
+ prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
+ (x ? PROT_EXEC : 0);
+
+ map = ((struct proc_mm_op) { .op = MM_MMAP,
+ .u =
+ { .mmap =
+ { .addr = virt,
+ .len = len,
+ .prot = prot,
+ .flags = MAP_SHARED |
+ MAP_FIXED,
+ .fd = phys_fd,
+ .offset = offset
+ } } } );
+ n = os_write_file(fd, &map, sizeof(map));
+ if(n != sizeof(map))
+ printk("map : /proc/mm map failed, err = %d\n", -n);
+}
+
+int unmap(int fd, void *addr, unsigned long len)
+{
+ struct proc_mm_op unmap;
+ int n;
+
+ unmap = ((struct proc_mm_op) { .op = MM_MUNMAP,
+ .u =
+ { .munmap =
+ { .addr = (unsigned long) addr,
+ .len = len } } } );
+ n = os_write_file(fd, &unmap, sizeof(unmap));
+ if(n != sizeof(unmap)) {
+ if(n < 0)
+ return(n);
+ else if(n > 0)
+ return(-EIO);
+ }
+
+ return(0);
+}
+
+int protect(int fd, unsigned long addr, unsigned long len, int r, int w,
+ int x, int must_succeed)
+{
+ struct proc_mm_op protect;
+ int prot, n;
+
+ prot = (r ? PROT_READ : 0) | (w ? PROT_WRITE : 0) |
+ (x ? PROT_EXEC : 0);
+
+ protect = ((struct proc_mm_op) { .op = MM_MPROTECT,
+ .u =
+ { .mprotect =
+ { .addr = (unsigned long) addr,
+ .len = len,
+ .prot = prot } } } );
+
+ n = os_write_file(fd, &protect, sizeof(protect));
+ if(n != sizeof(protect)) {
+ if(n == 0) return(0);
+
+ if(must_succeed)
+ panic("protect failed, err = %d", -n);
+
+ return(-EIO);
+ }
+
+ return(0);
+}
+
+void before_mem_skas(unsigned long unused)
+{
+}
+
+/*
+ * 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/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c
new file mode 100644
index 0000000..6cb9a6d
--- /dev/null
+++ b/arch/um/kernel/skas/mmu.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/sched.h"
+#include "linux/list.h"
+#include "linux/spinlock.h"
+#include "linux/slab.h"
+#include "asm/current.h"
+#include "asm/segment.h"
+#include "asm/mmu.h"
+#include "os.h"
+#include "skas.h"
+
+int init_new_context_skas(struct task_struct *task, struct mm_struct *mm)
+{
+ int from;
+
+ if((current->mm != NULL) && (current->mm != &init_mm))
+ from = current->mm->context.skas.mm_fd;
+ else from = -1;
+
+ mm->context.skas.mm_fd = new_mm(from);
+ if(mm->context.skas.mm_fd < 0){
+ printk("init_new_context_skas - new_mm failed, errno = %d\n",
+ mm->context.skas.mm_fd);
+ return(mm->context.skas.mm_fd);
+ }
+
+ return(0);
+}
+
+void destroy_context_skas(struct mm_struct *mm)
+{
+ os_close_file(mm->context.skas.mm_fd);
+}
+
+/*
+ * 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/kernel/skas/process.c b/arch/um/kernel/skas/process.c
new file mode 100644
index 0000000..b4ffaaa
--- /dev/null
+++ b/arch/um/kernel/skas/process.c
@@ -0,0 +1,339 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <signal.h>
+#include <setjmp.h>
+#include <sched.h>
+#include <sys/wait.h>
+#include <sys/mman.h>
+#include <sys/user.h>
+#include <asm/unistd.h>
+#include "user.h"
+#include "ptrace_user.h"
+#include "time_user.h"
+#include "sysdep/ptrace.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "skas.h"
+#include "sysdep/sigcontext.h"
+#include "os.h"
+#include "proc_mm.h"
+#include "skas_ptrace.h"
+#include "chan_user.h"
+#include "signal_user.h"
+#include "registers.h"
+
+int is_skas_winch(int pid, int fd, void *data)
+{
+ if(pid != os_getpid())
+ return(0);
+
+ register_winch_irq(-1, fd, -1, data);
+ return(1);
+}
+
+static void handle_segv(int pid)
+{
+ struct ptrace_faultinfo fault;
+ int err;
+
+ err = ptrace(PTRACE_FAULTINFO, pid, 0, &fault);
+ if(err)
+ panic("handle_segv - PTRACE_FAULTINFO failed, errno = %d\n",
+ errno);
+
+ segv(fault.addr, 0, FAULT_WRITE(fault.is_write), 1, NULL);
+}
+
+/*To use the same value of using_sysemu as the caller, ask it that value (in local_using_sysemu)*/
+static void handle_trap(int pid, union uml_pt_regs *regs, int local_using_sysemu)
+{
+ int err, status;
+
+ /* Mark this as a syscall */
+ UPT_SYSCALL_NR(regs) = PT_SYSCALL_NR(regs->skas.regs);
+
+ if (!local_using_sysemu)
+ {
+ err = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET, __NR_getpid);
+ if(err < 0)
+ panic("handle_trap - nullifying syscall failed errno = %d\n",
+ errno);
+
+ err = ptrace(PTRACE_SYSCALL, pid, 0, 0);
+ if(err < 0)
+ panic("handle_trap - continuing to end of syscall failed, "
+ "errno = %d\n", errno);
+
+ CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
+ if((err < 0) || !WIFSTOPPED(status) ||
+ (WSTOPSIG(status) != SIGTRAP + 0x80))
+ panic("handle_trap - failed to wait at end of syscall, "
+ "errno = %d, status = %d\n", errno, status);
+ }
+
+ handle_syscall(regs);
+}
+
+static int userspace_tramp(void *arg)
+{
+ init_new_thread_signals(0);
+ enable_timer();
+ ptrace(PTRACE_TRACEME, 0, 0, 0);
+ os_stop_process(os_getpid());
+ return(0);
+}
+
+/* Each element set once, and only accessed by a single processor anyway */
+#undef NR_CPUS
+#define NR_CPUS 1
+int userspace_pid[NR_CPUS];
+
+void start_userspace(int cpu)
+{
+ void *stack;
+ unsigned long sp;
+ int pid, status, n;
+
+ stack = mmap(NULL, PAGE_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC,
+ MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+ if(stack == MAP_FAILED)
+ panic("start_userspace : mmap failed, errno = %d", errno);
+ sp = (unsigned long) stack + PAGE_SIZE - sizeof(void *);
+
+ pid = clone(userspace_tramp, (void *) sp,
+ CLONE_FILES | CLONE_VM | SIGCHLD, NULL);
+ if(pid < 0)
+ panic("start_userspace : clone failed, errno = %d", errno);
+
+ do {
+ CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED));
+ if(n < 0)
+ panic("start_userspace : wait failed, errno = %d",
+ errno);
+ } while(WIFSTOPPED(status) && (WSTOPSIG(status) == SIGVTALRM));
+
+ if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP))
+ panic("start_userspace : expected SIGSTOP, got status = %d",
+ status);
+
+ if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL, (void *)PTRACE_O_TRACESYSGOOD) < 0)
+ panic("start_userspace : PTRACE_SETOPTIONS failed, errno=%d\n",
+ errno);
+
+ if(munmap(stack, PAGE_SIZE) < 0)
+ panic("start_userspace : munmap failed, errno = %d\n", errno);
+
+ userspace_pid[cpu] = pid;
+}
+
+void userspace(union uml_pt_regs *regs)
+{
+ int err, status, op, pid = userspace_pid[0];
+ int local_using_sysemu; /*To prevent races if using_sysemu changes under us.*/
+
+ while(1){
+ restore_registers(pid, regs);
+
+ /* Now we set local_using_sysemu to be used for one loop */
+ local_using_sysemu = get_using_sysemu();
+
+ op = SELECT_PTRACE_OPERATION(local_using_sysemu, singlestepping(NULL));
+
+ err = ptrace(op, pid, 0, 0);
+ if(err)
+ panic("userspace - could not resume userspace process, "
+ "pid=%d, ptrace operation = %d, errno = %d\n",
+ op, errno);
+
+ CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED));
+ if(err < 0)
+ panic("userspace - waitpid failed, errno = %d\n",
+ errno);
+
+ regs->skas.is_user = 1;
+ save_registers(pid, regs);
+ UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */
+
+ if(WIFSTOPPED(status)){
+ switch(WSTOPSIG(status)){
+ case SIGSEGV:
+ handle_segv(pid);
+ break;
+ case SIGTRAP + 0x80:
+ handle_trap(pid, regs, local_using_sysemu);
+ break;
+ case SIGTRAP:
+ relay_signal(SIGTRAP, regs);
+ break;
+ case SIGIO:
+ case SIGVTALRM:
+ case SIGILL:
+ case SIGBUS:
+ case SIGFPE:
+ case SIGWINCH:
+ user_signal(WSTOPSIG(status), regs);
+ break;
+ default:
+ printk("userspace - child stopped with signal "
+ "%d\n", WSTOPSIG(status));
+ }
+ interrupt_end();
+
+ /* Avoid -ERESTARTSYS handling in host */
+ PT_SYSCALL_NR(regs->skas.regs) = -1;
+ }
+ }
+}
+
+void new_thread(void *stack, void **switch_buf_ptr, void **fork_buf_ptr,
+ void (*handler)(int))
+{
+ unsigned long flags;
+ sigjmp_buf switch_buf, fork_buf;
+
+ *switch_buf_ptr = &switch_buf;
+ *fork_buf_ptr = &fork_buf;
+
+ /* Somewhat subtle - siglongjmp restores the signal mask before doing
+ * the longjmp. This means that when jumping from one stack to another
+ * when the target stack has interrupts enabled, an interrupt may occur
+ * on the source stack. This is bad when starting up a process because
+ * it's not supposed to get timer ticks until it has been scheduled.
+ * So, we disable interrupts around the sigsetjmp to ensure that
+ * they can't happen until we get back here where they are safe.
+ */
+ flags = get_signals();
+ block_signals();
+ if(sigsetjmp(fork_buf, 1) == 0)
+ new_thread_proc(stack, handler);
+
+ remove_sigstack();
+
+ set_signals(flags);
+}
+
+void thread_wait(void *sw, void *fb)
+{
+ sigjmp_buf buf, **switch_buf = sw, *fork_buf;
+
+ *switch_buf = &buf;
+ fork_buf = fb;
+ if(sigsetjmp(buf, 1) == 0)
+ siglongjmp(*fork_buf, 1);
+}
+
+void switch_threads(void *me, void *next)
+{
+ sigjmp_buf my_buf, **me_ptr = me, *next_buf = next;
+
+ *me_ptr = &my_buf;
+ if(sigsetjmp(my_buf, 1) == 0)
+ siglongjmp(*next_buf, 1);
+}
+
+static sigjmp_buf initial_jmpbuf;
+
+/* XXX Make these percpu */
+static void (*cb_proc)(void *arg);
+static void *cb_arg;
+static sigjmp_buf *cb_back;
+
+int start_idle_thread(void *stack, void *switch_buf_ptr, void **fork_buf_ptr)
+{
+ sigjmp_buf **switch_buf = switch_buf_ptr;
+ int n;
+
+ *fork_buf_ptr = &initial_jmpbuf;
+ n = sigsetjmp(initial_jmpbuf, 1);
+ if(n == 0)
+ new_thread_proc((void *) stack, new_thread_handler);
+ else if(n == 1)
+ remove_sigstack();
+ else if(n == 2){
+ (*cb_proc)(cb_arg);
+ siglongjmp(*cb_back, 1);
+ }
+ else if(n == 3){
+ kmalloc_ok = 0;
+ return(0);
+ }
+ else if(n == 4){
+ kmalloc_ok = 0;
+ return(1);
+ }
+ siglongjmp(**switch_buf, 1);
+}
+
+void remove_sigstack(void)
+{
+ stack_t stack = ((stack_t) { .ss_flags = SS_DISABLE,
+ .ss_sp = NULL,
+ .ss_size = 0 });
+
+ if(sigaltstack(&stack, NULL) != 0)
+ panic("disabling signal stack failed, errno = %d\n", errno);
+}
+
+void initial_thread_cb_skas(void (*proc)(void *), void *arg)
+{
+ sigjmp_buf here;
+
+ cb_proc = proc;
+ cb_arg = arg;
+ cb_back = &here;
+
+ block_signals();
+ if(sigsetjmp(here, 1) == 0)
+ siglongjmp(initial_jmpbuf, 2);
+ unblock_signals();
+
+ cb_proc = NULL;
+ cb_arg = NULL;
+ cb_back = NULL;
+}
+
+void halt_skas(void)
+{
+ block_signals();
+ siglongjmp(initial_jmpbuf, 3);
+}
+
+void reboot_skas(void)
+{
+ block_signals();
+ siglongjmp(initial_jmpbuf, 4);
+}
+
+void switch_mm_skas(int mm_fd)
+{
+ int err;
+
+#warning need cpu pid in switch_mm_skas
+ err = ptrace(PTRACE_SWITCH_MM, userspace_pid[0], 0, mm_fd);
+ if(err)
+ panic("switch_mm_skas - PTRACE_SWITCH_MM failed, errno = %d\n",
+ errno);
+}
+
+void kill_off_processes_skas(void)
+{
+#warning need to loop over userspace_pids in kill_off_processes_skas
+ os_kill_ptraced_process(userspace_pid[0], 1);
+}
+
+/*
+ * 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/kernel/skas/process_kern.c b/arch/um/kernel/skas/process_kern.c
new file mode 100644
index 0000000..5d096ea
--- /dev/null
+++ b/arch/um/kernel/skas/process_kern.c
@@ -0,0 +1,213 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/sched.h"
+#include "linux/slab.h"
+#include "linux/ptrace.h"
+#include "linux/proc_fs.h"
+#include "linux/file.h"
+#include "linux/errno.h"
+#include "linux/init.h"
+#include "asm/uaccess.h"
+#include "asm/atomic.h"
+#include "kern_util.h"
+#include "time_user.h"
+#include "signal_user.h"
+#include "skas.h"
+#include "os.h"
+#include "user_util.h"
+#include "tlb.h"
+#include "kern.h"
+#include "mode.h"
+#include "proc_mm.h"
+#include "registers.h"
+
+void *switch_to_skas(void *prev, void *next)
+{
+ struct task_struct *from, *to;
+
+ from = prev;
+ to = next;
+
+ /* XXX need to check runqueues[cpu].idle */
+ if(current->pid == 0)
+ switch_timers(0);
+
+ to->thread.prev_sched = from;
+ set_current(to);
+
+ switch_threads(&from->thread.mode.skas.switch_buf,
+ to->thread.mode.skas.switch_buf);
+
+ if(current->pid == 0)
+ switch_timers(1);
+
+ return(current->thread.prev_sched);
+}
+
+extern void schedule_tail(struct task_struct *prev);
+
+void new_thread_handler(int sig)
+{
+ int (*fn)(void *), n;
+ void *arg;
+
+ fn = current->thread.request.u.thread.proc;
+ arg = current->thread.request.u.thread.arg;
+ change_sig(SIGUSR1, 1);
+ thread_wait(¤t->thread.mode.skas.switch_buf,
+ current->thread.mode.skas.fork_buf);
+
+ if(current->thread.prev_sched != NULL)
+ schedule_tail(current->thread.prev_sched);
+ current->thread.prev_sched = NULL;
+
+ /* The return value is 1 if the kernel thread execs a process,
+ * 0 if it just exits
+ */
+ n = run_kernel_thread(fn, arg, ¤t->thread.exec_buf);
+ if(n == 1)
+ userspace(¤t->thread.regs.regs);
+ else do_exit(0);
+}
+
+void new_thread_proc(void *stack, void (*handler)(int sig))
+{
+ init_new_thread_stack(stack, handler);
+ os_usr1_process(os_getpid());
+}
+
+void release_thread_skas(struct task_struct *task)
+{
+}
+
+void exit_thread_skas(void)
+{
+}
+
+void fork_handler(int sig)
+{
+ change_sig(SIGUSR1, 1);
+ thread_wait(¤t->thread.mode.skas.switch_buf,
+ current->thread.mode.skas.fork_buf);
+
+ force_flush_all();
+ if(current->thread.prev_sched == NULL)
+ panic("blech");
+
+ schedule_tail(current->thread.prev_sched);
+ current->thread.prev_sched = NULL;
+
+ userspace(¤t->thread.regs.regs);
+}
+
+int copy_thread_skas(int nr, unsigned long clone_flags, unsigned long sp,
+ unsigned long stack_top, struct task_struct * p,
+ struct pt_regs *regs)
+{
+ void (*handler)(int);
+
+ if(current->thread.forking){
+ memcpy(&p->thread.regs.regs.skas,
+ ¤t->thread.regs.regs.skas,
+ sizeof(p->thread.regs.regs.skas));
+ REGS_SET_SYSCALL_RETURN(p->thread.regs.regs.skas.regs, 0);
+ if(sp != 0) REGS_SP(p->thread.regs.regs.skas.regs) = sp;
+
+ handler = fork_handler;
+ }
+ else {
+ init_thread_registers(&p->thread.regs.regs);
+ p->thread.request.u.thread = current->thread.request.u.thread;
+ handler = new_thread_handler;
+ }
+
+ new_thread(p->thread_info, &p->thread.mode.skas.switch_buf,
+ &p->thread.mode.skas.fork_buf, handler);
+ return(0);
+}
+
+int new_mm(int from)
+{
+ struct proc_mm_op copy;
+ int n, fd;
+
+ fd = os_open_file("/proc/mm", of_cloexec(of_write(OPENFLAGS())), 0);
+ if(fd < 0)
+ return(fd);
+
+ if(from != -1){
+ copy = ((struct proc_mm_op) { .op = MM_COPY_SEGMENTS,
+ .u =
+ { .copy_segments = from } } );
+ n = os_write_file(fd, ©, sizeof(copy));
+ if(n != sizeof(copy))
+ printk("new_mm : /proc/mm copy_segments failed, "
+ "err = %d\n", -n);
+ }
+
+ return(fd);
+}
+
+void init_idle_skas(void)
+{
+ cpu_tasks[current_thread->cpu].pid = os_getpid();
+ default_idle();
+}
+
+extern void start_kernel(void);
+
+static int start_kernel_proc(void *unused)
+{
+ int pid;
+
+ block_signals();
+ pid = os_getpid();
+
+ cpu_tasks[0].pid = pid;
+ cpu_tasks[0].task = current;
+#ifdef CONFIG_SMP
+ cpu_online_map = cpumask_of_cpu(0);
+#endif
+ start_kernel();
+ return(0);
+}
+
+int start_uml_skas(void)
+{
+ start_userspace(0);
+
+ init_new_thread_signals(1);
+ uml_idle_timer();
+
+ init_task.thread.request.u.thread.proc = start_kernel_proc;
+ init_task.thread.request.u.thread.arg = NULL;
+ return(start_idle_thread(init_task.thread_info,
+ &init_task.thread.mode.skas.switch_buf,
+ &init_task.thread.mode.skas.fork_buf));
+}
+
+int external_pid_skas(struct task_struct *task)
+{
+#warning Need to look up userspace_pid by cpu
+ return(userspace_pid[0]);
+}
+
+int thread_pid_skas(struct task_struct *task)
+{
+#warning Need to look up userspace_pid by cpu
+ return(userspace_pid[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/kernel/skas/syscall_kern.c b/arch/um/kernel/skas/syscall_kern.c
new file mode 100644
index 0000000..bdf040c
--- /dev/null
+++ b/arch/um/kernel/skas/syscall_kern.c
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/sys.h"
+#include "linux/ptrace.h"
+#include "asm/errno.h"
+#include "asm/unistd.h"
+#include "asm/ptrace.h"
+#include "asm/current.h"
+#include "sysdep/syscalls.h"
+#include "kern_util.h"
+
+extern syscall_handler_t *sys_call_table[];
+
+long execute_syscall_skas(void *r)
+{
+ struct pt_regs *regs = r;
+ long res;
+ int syscall;
+
+ current->thread.nsyscalls++;
+ nsyscalls++;
+ syscall = UPT_SYSCALL_NR(®s->regs);
+
+ if((syscall >= NR_syscalls) || (syscall < 0))
+ res = -ENOSYS;
+ else res = EXECUTE_SYSCALL(syscall, regs);
+
+ return(res);
+}
+
+/*
+ * 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/kernel/skas/syscall_user.c b/arch/um/kernel/skas/syscall_user.c
new file mode 100644
index 0000000..2828e6e
--- /dev/null
+++ b/arch/um/kernel/skas/syscall_user.c
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdlib.h>
+#include <signal.h>
+#include "kern_util.h"
+#include "uml-config.h"
+#include "syscall_user.h"
+#include "sysdep/ptrace.h"
+#include "sysdep/sigcontext.h"
+#include "skas.h"
+
+void handle_syscall(union uml_pt_regs *regs)
+{
+ long result;
+#if UML_CONFIG_SYSCALL_DEBUG
+ int index;
+
+ index = record_syscall_start(UPT_SYSCALL_NR(regs));
+#endif
+
+ syscall_trace(regs, 0);
+ result = execute_syscall_skas(regs);
+
+ REGS_SET_SYSCALL_RETURN(regs->skas.regs, result);
+
+ syscall_trace(regs, 1);
+#if UML_CONFIG_SYSCALL_DEBUG
+ record_syscall_end(index, result);
+#endif
+}
+
+/*
+ * 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/kernel/skas/time.c b/arch/um/kernel/skas/time.c
new file mode 100644
index 0000000..9809149
--- /dev/null
+++ b/arch/um/kernel/skas/time.c
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <sys/signal.h>
+#include <sys/time.h>
+#include "time_user.h"
+#include "process.h"
+#include "user.h"
+
+void user_time_init_skas(void)
+{
+ if(signal(SIGALRM, (__sighandler_t) alarm_handler) == SIG_ERR)
+ panic("Couldn't set SIGALRM handler");
+ if(signal(SIGVTALRM, (__sighandler_t) alarm_handler) == SIG_ERR)
+ panic("Couldn't set SIGVTALRM handler");
+ set_interval(ITIMER_VIRTUAL);
+}
+
+/*
+ * 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/kernel/skas/tlb.c b/arch/um/kernel/skas/tlb.c
new file mode 100644
index 0000000..b8c5e71
--- /dev/null
+++ b/arch/um/kernel/skas/tlb.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright 2003 PathScale, Inc.
+ * Licensed under the GPL
+ */
+
+#include "linux/stddef.h"
+#include "linux/sched.h"
+#include "linux/mm.h"
+#include "asm/page.h"
+#include "asm/pgtable.h"
+#include "asm/mmu.h"
+#include "user_util.h"
+#include "mem_user.h"
+#include "mem.h"
+#include "skas.h"
+#include "os.h"
+#include "tlb.h"
+
+static void do_ops(int fd, struct host_vm_op *ops, int last)
+{
+ struct host_vm_op *op;
+ int i;
+
+ for(i = 0; i <= last; i++){
+ op = &ops[i];
+ switch(op->type){
+ case MMAP:
+ map(fd, op->u.mmap.addr, op->u.mmap.len,
+ op->u.mmap.r, op->u.mmap.w, op->u.mmap.x,
+ op->u.mmap.fd, op->u.mmap.offset);
+ break;
+ case MUNMAP:
+ unmap(fd, (void *) op->u.munmap.addr,
+ op->u.munmap.len);
+ break;
+ case MPROTECT:
+ protect(fd, op->u.mprotect.addr, op->u.mprotect.len,
+ op->u.mprotect.r, op->u.mprotect.w,
+ op->u.mprotect.x);
+ break;
+ default:
+ printk("Unknown op type %d in do_ops\n", op->type);
+ break;
+ }
+ }
+}
+
+static void fix_range(struct mm_struct *mm, unsigned long start_addr,
+ unsigned long end_addr, int force)
+{
+ int fd = mm->context.skas.mm_fd;
+
+ fix_range_common(mm, start_addr, end_addr, force, fd, do_ops);
+}
+
+void __flush_tlb_one_skas(unsigned long addr)
+{
+ flush_tlb_kernel_range_common(addr, addr + PAGE_SIZE);
+}
+
+void flush_tlb_range_skas(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end)
+{
+ if(vma->vm_mm == NULL)
+ flush_tlb_kernel_range_common(start, end);
+ else fix_range(vma->vm_mm, start, end, 0);
+}
+
+void flush_tlb_mm_skas(struct mm_struct *mm)
+{
+ /* Don't bother flushing if this address space is about to be
+ * destroyed.
+ */
+ if(atomic_read(&mm->mm_users) == 0)
+ return;
+
+ fix_range(mm, 0, host_task_size, 0);
+ flush_tlb_kernel_range_common(start_vm, end_vm);
+}
+
+void force_flush_all_skas(void)
+{
+ fix_range(current->mm, 0, host_task_size, 1);
+}
diff --git a/arch/um/kernel/skas/trap_user.c b/arch/um/kernel/skas/trap_user.c
new file mode 100644
index 0000000..8e9b46d
--- /dev/null
+++ b/arch/um/kernel/skas/trap_user.c
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include <signal.h>
+#include <errno.h>
+#include "sysdep/ptrace.h"
+#include "signal_user.h"
+#include "user_util.h"
+#include "kern_util.h"
+#include "task.h"
+#include "sigcontext.h"
+
+void sig_handler_common_skas(int sig, void *sc_ptr)
+{
+ struct sigcontext *sc = sc_ptr;
+ struct skas_regs *r;
+ struct signal_info *info;
+ int save_errno = errno;
+ int save_user;
+
+ /* This is done because to allow SIGSEGV to be delivered inside a SEGV
+ * handler. This can happen in copy_user, and if SEGV is disabled,
+ * the process will die.
+ * XXX Figure out why this is better than SA_NODEFER
+ */
+ if(sig == SIGSEGV)
+ change_sig(SIGSEGV, 1);
+
+ r = &TASK_REGS(get_current())->skas;
+ save_user = r->is_user;
+ r->is_user = 0;
+ r->fault_addr = SC_FAULT_ADDR(sc);
+ r->fault_type = SC_FAULT_TYPE(sc);
+ r->trap_type = SC_TRAP_TYPE(sc);
+
+ change_sig(SIGUSR1, 1);
+ info = &sig_info[sig];
+ if(!info->is_irq) unblock_signals();
+
+ (*info->handler)(sig, (union uml_pt_regs *) r);
+
+ errno = save_errno;
+ r->is_user = save_user;
+}
+
+void user_signal(int sig, union uml_pt_regs *regs)
+{
+ struct signal_info *info;
+
+ regs->skas.is_user = 1;
+ regs->skas.fault_addr = 0;
+ regs->skas.fault_type = 0;
+ regs->skas.trap_type = 0;
+ info = &sig_info[sig];
+ (*info->handler)(sig, regs);
+
+ unblock_signals();
+}
+
+/*
+ * 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/kernel/skas/uaccess.c b/arch/um/kernel/skas/uaccess.c
new file mode 100644
index 0000000..7575ec4
--- /dev/null
+++ b/arch/um/kernel/skas/uaccess.c
@@ -0,0 +1,259 @@
+/*
+ * Copyright (C) 2002 - 2003 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/stddef.h"
+#include "linux/kernel.h"
+#include "linux/string.h"
+#include "linux/fs.h"
+#include "linux/highmem.h"
+#include "asm/page.h"
+#include "asm/pgtable.h"
+#include "asm/uaccess.h"
+#include "kern_util.h"
+#include "user_util.h"
+
+extern void *um_virt_to_phys(struct task_struct *task, unsigned long addr,
+ pte_t *pte_out);
+
+static unsigned long maybe_map(unsigned long virt, int is_write)
+{
+ pte_t pte;
+ int err;
+
+ void *phys = um_virt_to_phys(current, virt, &pte);
+ int dummy_code;
+
+ if(IS_ERR(phys) || (is_write && !pte_write(pte))){
+ err = handle_page_fault(virt, 0, is_write, 1, &dummy_code);
+ if(err)
+ return(0);
+ phys = um_virt_to_phys(current, virt, NULL);
+ }
+ return((unsigned long) phys);
+}
+
+static int do_op(unsigned long addr, int len, int is_write,
+ int (*op)(unsigned long addr, int len, void *arg), void *arg)
+{
+ struct page *page;
+ int n;
+
+ addr = maybe_map(addr, is_write);
+ if(addr == -1)
+ return(-1);
+
+ page = phys_to_page(addr);
+ addr = (unsigned long) kmap(page) + (addr & ~PAGE_MASK);
+ n = (*op)(addr, len, arg);
+ kunmap(page);
+
+ return(n);
+}
+
+static void do_buffer_op(void *jmpbuf, void *arg_ptr)
+{
+ va_list args;
+ unsigned long addr;
+ int len, is_write, size, remain, n;
+ int (*op)(unsigned long, int, void *);
+ void *arg;
+ int *res;
+
+ /* Some old gccs recognize __va_copy, but not va_copy */
+ __va_copy(args, *(va_list *)arg_ptr);
+ addr = va_arg(args, unsigned long);
+ len = va_arg(args, int);
+ is_write = va_arg(args, int);
+ op = va_arg(args, void *);
+ arg = va_arg(args, void *);
+ res = va_arg(args, int *);
+ va_end(args);
+ size = min(PAGE_ALIGN(addr) - addr, (unsigned long) len);
+ remain = len;
+
+ current->thread.fault_catcher = jmpbuf;
+ n = do_op(addr, size, is_write, op, arg);
+ if(n != 0){
+ *res = (n < 0 ? remain : 0);
+ goto out;
+ }
+
+ addr += size;
+ remain -= size;
+ if(remain == 0){
+ *res = 0;
+ goto out;
+ }
+
+ while(addr < ((addr + remain) & PAGE_MASK)){
+ n = do_op(addr, PAGE_SIZE, is_write, op, arg);
+ if(n != 0){
+ *res = (n < 0 ? remain : 0);
+ goto out;
+ }
+
+ addr += PAGE_SIZE;
+ remain -= PAGE_SIZE;
+ }
+ if(remain == 0){
+ *res = 0;
+ goto out;
+ }
+
+ n = do_op(addr, remain, is_write, op, arg);
+ if(n != 0)
+ *res = (n < 0 ? remain : 0);
+ else *res = 0;
+ out:
+ current->thread.fault_catcher = NULL;
+}
+
+static int buffer_op(unsigned long addr, int len, int is_write,
+ int (*op)(unsigned long addr, int len, void *arg),
+ void *arg)
+{
+ int faulted, res;
+
+ faulted = setjmp_wrapper(do_buffer_op, addr, len, is_write, op, arg,
+ &res);
+ if(!faulted)
+ return(res);
+
+ return(addr + len - (unsigned long) current->thread.fault_addr);
+}
+
+static int copy_chunk_from_user(unsigned long from, int len, void *arg)
+{
+ unsigned long *to_ptr = arg, to = *to_ptr;
+
+ memcpy((void *) to, (void *) from, len);
+ *to_ptr += len;
+ return(0);
+}
+
+int copy_from_user_skas(void *to, const void __user *from, int n)
+{
+ if(segment_eq(get_fs(), KERNEL_DS)){
+ memcpy(to, (__force void*)from, n);
+ return(0);
+ }
+
+ return(access_ok_skas(VERIFY_READ, from, n) ?
+ buffer_op((unsigned long) from, n, 0, copy_chunk_from_user, &to):
+ n);
+}
+
+static int copy_chunk_to_user(unsigned long to, int len, void *arg)
+{
+ unsigned long *from_ptr = arg, from = *from_ptr;
+
+ memcpy((void *) to, (void *) from, len);
+ *from_ptr += len;
+ return(0);
+}
+
+int copy_to_user_skas(void __user *to, const void *from, int n)
+{
+ if(segment_eq(get_fs(), KERNEL_DS)){
+ memcpy((__force void*)to, from, n);
+ return(0);
+ }
+
+ return(access_ok_skas(VERIFY_WRITE, to, n) ?
+ buffer_op((unsigned long) to, n, 1, copy_chunk_to_user, &from) :
+ n);
+}
+
+static int strncpy_chunk_from_user(unsigned long from, int len, void *arg)
+{
+ char **to_ptr = arg, *to = *to_ptr;
+ int n;
+
+ strncpy(to, (void *) from, len);
+ n = strnlen(to, len);
+ *to_ptr += n;
+
+ if(n < len)
+ return(1);
+ return(0);
+}
+
+int strncpy_from_user_skas(char *dst, const char __user *src, int count)
+{
+ int n;
+ char *ptr = dst;
+
+ if(segment_eq(get_fs(), KERNEL_DS)){
+ strncpy(dst, (__force void*)src, count);
+ return(strnlen(dst, count));
+ }
+
+ if(!access_ok_skas(VERIFY_READ, src, 1))
+ return(-EFAULT);
+
+ n = buffer_op((unsigned long) src, count, 0, strncpy_chunk_from_user,
+ &ptr);
+ if(n != 0)
+ return(-EFAULT);
+ return(strnlen(dst, count));
+}
+
+static int clear_chunk(unsigned long addr, int len, void *unused)
+{
+ memset((void *) addr, 0, len);
+ return(0);
+}
+
+int __clear_user_skas(void __user *mem, int len)
+{
+ return(buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL));
+}
+
+int clear_user_skas(void __user *mem, int len)
+{
+ if(segment_eq(get_fs(), KERNEL_DS)){
+ memset((__force void*)mem, 0, len);
+ return(0);
+ }
+
+ return(access_ok_skas(VERIFY_WRITE, mem, len) ?
+ buffer_op((unsigned long) mem, len, 1, clear_chunk, NULL) : len);
+}
+
+static int strnlen_chunk(unsigned long str, int len, void *arg)
+{
+ int *len_ptr = arg, n;
+
+ n = strnlen((void *) str, len);
+ *len_ptr += n;
+
+ if(n < len)
+ return(1);
+ return(0);
+}
+
+int strnlen_user_skas(const void __user *str, int len)
+{
+ int count = 0, n;
+
+ if(segment_eq(get_fs(), KERNEL_DS))
+ return(strnlen((__force char*)str, len) + 1);
+
+ n = buffer_op((unsigned long) str, len, 0, strnlen_chunk, &count);
+ if(n == 0)
+ return(count + 1);
+ return(-EFAULT);
+}
+
+/*
+ * 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/kernel/skas/util/Makefile b/arch/um/kernel/skas/util/Makefile
new file mode 100644
index 0000000..17f5909
--- /dev/null
+++ b/arch/um/kernel/skas/util/Makefile
@@ -0,0 +1,4 @@
+hostprogs-y := mk_ptregs
+always := $(hostprogs-y)
+
+mk_ptregs-objs := mk_ptregs-$(SUBARCH).o
diff --git a/arch/um/kernel/skas/util/mk_ptregs-i386.c b/arch/um/kernel/skas/util/mk_ptregs-i386.c
new file mode 100644
index 0000000..0788dd0
--- /dev/null
+++ b/arch/um/kernel/skas/util/mk_ptregs-i386.c
@@ -0,0 +1,51 @@
+#include <stdio.h>
+#include <asm/ptrace.h>
+#include <asm/user.h>
+
+#define PRINT_REG(name, val) printf("#define HOST_%s %d\n", (name), (val))
+
+int main(int argc, char **argv)
+{
+ printf("/* Automatically generated by "
+ "arch/um/kernel/skas/util/mk_ptregs */\n");
+ printf("\n");
+ printf("#ifndef __SKAS_PT_REGS_\n");
+ printf("#define __SKAS_PT_REGS_\n");
+ printf("\n");
+ printf("#define HOST_FRAME_SIZE %d\n", FRAME_SIZE);
+ printf("#define HOST_FP_SIZE %d\n",
+ sizeof(struct user_i387_struct) / sizeof(unsigned long));
+ printf("#define HOST_XFP_SIZE %d\n",
+ sizeof(struct user_fxsr_struct) / sizeof(unsigned long));
+
+ PRINT_REG("IP", EIP);
+ PRINT_REG("SP", UESP);
+ PRINT_REG("EFLAGS", EFL);
+ PRINT_REG("EAX", EAX);
+ PRINT_REG("EBX", EBX);
+ PRINT_REG("ECX", ECX);
+ PRINT_REG("EDX", EDX);
+ PRINT_REG("ESI", ESI);
+ PRINT_REG("EDI", EDI);
+ PRINT_REG("EBP", EBP);
+ PRINT_REG("CS", CS);
+ PRINT_REG("SS", SS);
+ PRINT_REG("DS", DS);
+ PRINT_REG("FS", FS);
+ PRINT_REG("ES", ES);
+ PRINT_REG("GS", GS);
+ printf("\n");
+ printf("#endif\n");
+ 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/kernel/skas/util/mk_ptregs-x86_64.c b/arch/um/kernel/skas/util/mk_ptregs-x86_64.c
new file mode 100644
index 0000000..67aee92
--- /dev/null
+++ b/arch/um/kernel/skas/util/mk_ptregs-x86_64.c
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2003 PathScale, Inc.
+ *
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#define __FRAME_OFFSETS
+#include <asm/ptrace.h>
+
+#define PRINT_REG(name, val) \
+ printf("#define HOST_%s (%d / sizeof(unsigned long))\n", (name), (val))
+
+int main(int argc, char **argv)
+{
+ printf("/* Automatically generated by "
+ "arch/um/kernel/skas/util/mk_ptregs */\n");
+ printf("\n");
+ printf("#ifndef __SKAS_PT_REGS_\n");
+ printf("#define __SKAS_PT_REGS_\n");
+ printf("#define HOST_FRAME_SIZE (%d / sizeof(unsigned long))\n",
+ FRAME_SIZE);
+ PRINT_REG("RBX", RBX);
+ PRINT_REG("RCX", RCX);
+ PRINT_REG("RDI", RDI);
+ PRINT_REG("RSI", RSI);
+ PRINT_REG("RDX", RDX);
+ PRINT_REG("RBP", RBP);
+ PRINT_REG("RAX", RAX);
+ PRINT_REG("R8", R8);
+ PRINT_REG("R9", R9);
+ PRINT_REG("R10", R10);
+ PRINT_REG("R11", R11);
+ PRINT_REG("R12", R12);
+ PRINT_REG("R13", R13);
+ PRINT_REG("R14", R14);
+ PRINT_REG("R15", R15);
+ PRINT_REG("ORIG_RAX", ORIG_RAX);
+ PRINT_REG("CS", CS);
+ PRINT_REG("SS", SS);
+ PRINT_REG("EFLAGS", EFLAGS);
+#if 0
+ PRINT_REG("FS", FS);
+ PRINT_REG("GS", GS);
+ PRINT_REG("DS", DS);
+ PRINT_REG("ES", ES);
+#endif
+
+ PRINT_REG("IP", RIP);
+ PRINT_REG("SP", RSP);
+ printf("#define HOST_FP_SIZE 0\n");
+ printf("#define HOST_XFP_SIZE 0\n");
+ printf("\n");
+ printf("\n");
+ printf("#endif\n");
+ 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:
+ */