Initial commit
This commit is contained in:
Ole André Vadla Ravnås
commit
169c65d57e
51358 changed files with 23120455 additions and 0 deletions
10
arch/um/os-Linux/skas/Makefile
Normal file
10
arch/um/os-Linux/skas/Makefile
Normal file
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@ -0,0 +1,10 @@
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#
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# Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com)
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# Licensed under the GPL
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#
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obj-y := mem.o process.o
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USER_OBJS := $(obj-y)
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include arch/um/scripts/Makefile.rules
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283
arch/um/os-Linux/skas/mem.c
Normal file
283
arch/um/os-Linux/skas/mem.c
Normal file
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@ -0,0 +1,283 @@
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/*
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* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include <stddef.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <init.h>
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#include <as-layout.h>
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#include <mm_id.h>
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#include <os.h>
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#include <proc_mm.h>
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#include <ptrace_user.h>
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#include <registers.h>
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#include <skas.h>
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#include <sysdep/ptrace.h>
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#include <sysdep/stub.h>
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extern unsigned long batch_syscall_stub, __syscall_stub_start;
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extern void wait_stub_done(int pid);
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static inline unsigned long *check_init_stack(struct mm_id * mm_idp,
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unsigned long *stack)
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{
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if (stack == NULL) {
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stack = (unsigned long *) mm_idp->stack + 2;
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*stack = 0;
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}
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return stack;
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}
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static unsigned long syscall_regs[MAX_REG_NR];
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static int __init init_syscall_regs(void)
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{
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get_safe_registers(syscall_regs, NULL);
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syscall_regs[REGS_IP_INDEX] = STUB_CODE +
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((unsigned long) &batch_syscall_stub -
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(unsigned long) &__syscall_stub_start);
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return 0;
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}
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__initcall(init_syscall_regs);
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extern int proc_mm;
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static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
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{
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int n, i;
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long ret, offset;
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unsigned long * data;
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unsigned long * syscall;
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int err, pid = mm_idp->u.pid;
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if (proc_mm)
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/* FIXME: Need to look up userspace_pid by cpu */
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pid = userspace_pid[0];
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n = ptrace_setregs(pid, syscall_regs);
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if (n < 0) {
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printk(UM_KERN_ERR "Registers - \n");
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for (i = 0; i < MAX_REG_NR; i++)
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printk(UM_KERN_ERR "\t%d\t0x%lx\n", i, syscall_regs[i]);
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panic("do_syscall_stub : PTRACE_SETREGS failed, errno = %d\n",
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-n);
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}
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err = ptrace(PTRACE_CONT, pid, 0, 0);
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if (err)
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panic("Failed to continue stub, pid = %d, errno = %d\n", pid,
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errno);
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wait_stub_done(pid);
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/*
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* When the stub stops, we find the following values on the
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* beginning of the stack:
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* (long )return_value
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* (long )offset to failed sycall-data (0, if no error)
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*/
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ret = *((unsigned long *) mm_idp->stack);
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offset = *((unsigned long *) mm_idp->stack + 1);
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if (offset) {
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data = (unsigned long *)(mm_idp->stack + offset - STUB_DATA);
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printk(UM_KERN_ERR "do_syscall_stub : ret = %ld, offset = %ld, "
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"data = %p\n", ret, offset, data);
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syscall = (unsigned long *)((unsigned long)data + data[0]);
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printk(UM_KERN_ERR "do_syscall_stub: syscall %ld failed, "
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"return value = 0x%lx, expected return value = 0x%lx\n",
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syscall[0], ret, syscall[7]);
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printk(UM_KERN_ERR " syscall parameters: "
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"0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
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syscall[1], syscall[2], syscall[3],
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syscall[4], syscall[5], syscall[6]);
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for (n = 1; n < data[0]/sizeof(long); n++) {
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if (n == 1)
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printk(UM_KERN_ERR " additional syscall "
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"data:");
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if (n % 4 == 1)
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printk("\n" UM_KERN_ERR " ");
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printk(" 0x%lx", data[n]);
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}
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if (n > 1)
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printk("\n");
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}
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else ret = 0;
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*addr = check_init_stack(mm_idp, NULL);
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return ret;
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}
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long run_syscall_stub(struct mm_id * mm_idp, int syscall,
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unsigned long *args, long expected, void **addr,
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int done)
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{
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unsigned long *stack = check_init_stack(mm_idp, *addr);
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*stack += sizeof(long);
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stack += *stack / sizeof(long);
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*stack++ = syscall;
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*stack++ = args[0];
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*stack++ = args[1];
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*stack++ = args[2];
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*stack++ = args[3];
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*stack++ = args[4];
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*stack++ = args[5];
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*stack++ = expected;
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*stack = 0;
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if (!done && ((((unsigned long) stack) & ~UM_KERN_PAGE_MASK) <
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UM_KERN_PAGE_SIZE - 10 * sizeof(long))) {
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*addr = stack;
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return 0;
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}
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return do_syscall_stub(mm_idp, addr);
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}
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long syscall_stub_data(struct mm_id * mm_idp,
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unsigned long *data, int data_count,
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void **addr, void **stub_addr)
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{
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unsigned long *stack;
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int ret = 0;
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/*
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* If *addr still is uninitialized, it *must* contain NULL.
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* Thus in this case do_syscall_stub correctly won't be called.
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*/
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if ((((unsigned long) *addr) & ~UM_KERN_PAGE_MASK) >=
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UM_KERN_PAGE_SIZE - (10 + data_count) * sizeof(long)) {
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ret = do_syscall_stub(mm_idp, addr);
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/* in case of error, don't overwrite data on stack */
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if (ret)
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return ret;
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}
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stack = check_init_stack(mm_idp, *addr);
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*addr = stack;
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*stack = data_count * sizeof(long);
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memcpy(stack + 1, data, data_count * sizeof(long));
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*stub_addr = (void *)(((unsigned long)(stack + 1) &
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~UM_KERN_PAGE_MASK) + STUB_DATA);
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return 0;
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}
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int map(struct mm_id * mm_idp, unsigned long virt, unsigned long len, int prot,
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int phys_fd, unsigned long long offset, int done, void **data)
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{
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int ret;
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if (proc_mm) {
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struct proc_mm_op map;
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int fd = mm_idp->u.mm_fd;
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map = ((struct proc_mm_op) { .op = MM_MMAP,
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.u =
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{ .mmap =
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{ .addr = virt,
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.len = len,
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.prot = prot,
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.flags = MAP_SHARED |
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MAP_FIXED,
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.fd = phys_fd,
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.offset= offset
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} } } );
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CATCH_EINTR(ret = write(fd, &map, sizeof(map)));
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if (ret != sizeof(map)) {
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ret = -errno;
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printk(UM_KERN_ERR "map : /proc/mm map failed, "
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"err = %d\n", -ret);
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}
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else ret = 0;
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}
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else {
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unsigned long args[] = { virt, len, prot,
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MAP_SHARED | MAP_FIXED, phys_fd,
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MMAP_OFFSET(offset) };
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ret = run_syscall_stub(mm_idp, STUB_MMAP_NR, args, virt,
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data, done);
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}
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return ret;
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}
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int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
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int done, void **data)
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{
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int ret;
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if (proc_mm) {
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struct proc_mm_op unmap;
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int fd = mm_idp->u.mm_fd;
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unmap = ((struct proc_mm_op) { .op = MM_MUNMAP,
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.u =
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{ .munmap =
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{ .addr =
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(unsigned long) addr,
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.len = len } } } );
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CATCH_EINTR(ret = write(fd, &unmap, sizeof(unmap)));
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if (ret != sizeof(unmap)) {
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ret = -errno;
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printk(UM_KERN_ERR "unmap - proc_mm write returned "
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"%d\n", ret);
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}
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else ret = 0;
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}
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else {
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unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0,
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0 };
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ret = run_syscall_stub(mm_idp, __NR_munmap, args, 0,
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data, done);
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}
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return ret;
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}
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int protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
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unsigned int prot, int done, void **data)
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{
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struct proc_mm_op protect;
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int ret;
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if (proc_mm) {
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int fd = mm_idp->u.mm_fd;
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protect = ((struct proc_mm_op) { .op = MM_MPROTECT,
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.u =
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{ .mprotect =
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{ .addr =
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(unsigned long) addr,
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.len = len,
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.prot = prot } } } );
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CATCH_EINTR(ret = write(fd, &protect, sizeof(protect)));
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if (ret != sizeof(protect)) {
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ret = -errno;
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printk(UM_KERN_ERR "protect failed, err = %d", -ret);
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}
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else ret = 0;
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}
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else {
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unsigned long args[] = { addr, len, prot, 0, 0, 0 };
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ret = run_syscall_stub(mm_idp, __NR_mprotect, args, 0,
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data, done);
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}
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return ret;
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}
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744
arch/um/os-Linux/skas/process.c
Normal file
744
arch/um/os-Linux/skas/process.c
Normal file
|
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@ -0,0 +1,744 @@
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/*
|
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* Copyright (C) 2002- 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
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* Licensed under the GPL
|
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*/
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#include <stdlib.h>
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#include <unistd.h>
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#include <sched.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/wait.h>
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#include <asm/unistd.h>
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#include <as-layout.h>
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#include <init.h>
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#include <kern_util.h>
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#include <mem.h>
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#include <os.h>
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#include <proc_mm.h>
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#include <ptrace_user.h>
|
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#include <registers.h>
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#include <skas.h>
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#include <skas_ptrace.h>
|
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#include <sysdep/stub.h>
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|
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int is_skas_winch(int pid, int fd, void *data)
|
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{
|
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return pid == getpgrp();
|
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}
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|
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static int ptrace_dump_regs(int pid)
|
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{
|
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unsigned long regs[MAX_REG_NR];
|
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int i;
|
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|
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if (ptrace(PTRACE_GETREGS, pid, 0, regs) < 0)
|
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return -errno;
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|
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printk(UM_KERN_ERR "Stub registers -\n");
|
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for (i = 0; i < ARRAY_SIZE(regs); i++)
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printk(UM_KERN_ERR "\t%d - %lx\n", i, regs[i]);
|
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|
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return 0;
|
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}
|
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|
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/*
|
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* Signals that are OK to receive in the stub - we'll just continue it.
|
||||
* SIGWINCH will happen when UML is inside a detached screen.
|
||||
*/
|
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#define STUB_SIG_MASK ((1 << SIGVTALRM) | (1 << SIGWINCH))
|
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|
||||
/* Signals that the stub will finish with - anything else is an error */
|
||||
#define STUB_DONE_MASK (1 << SIGTRAP)
|
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|
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void wait_stub_done(int pid)
|
||||
{
|
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int n, status, err;
|
||||
|
||||
while (1) {
|
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CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED | __WALL));
|
||||
if ((n < 0) || !WIFSTOPPED(status))
|
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goto bad_wait;
|
||||
|
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if (((1 << WSTOPSIG(status)) & STUB_SIG_MASK) == 0)
|
||||
break;
|
||||
|
||||
err = ptrace(PTRACE_CONT, pid, 0, 0);
|
||||
if (err) {
|
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printk(UM_KERN_ERR "wait_stub_done : continue failed, "
|
||||
"errno = %d\n", errno);
|
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fatal_sigsegv();
|
||||
}
|
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}
|
||||
|
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if (((1 << WSTOPSIG(status)) & STUB_DONE_MASK) != 0)
|
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return;
|
||||
|
||||
bad_wait:
|
||||
err = ptrace_dump_regs(pid);
|
||||
if (err)
|
||||
printk(UM_KERN_ERR "Failed to get registers from stub, "
|
||||
"errno = %d\n", -err);
|
||||
printk(UM_KERN_ERR "wait_stub_done : failed to wait for SIGTRAP, "
|
||||
"pid = %d, n = %d, errno = %d, status = 0x%x\n", pid, n, errno,
|
||||
status);
|
||||
fatal_sigsegv();
|
||||
}
|
||||
|
||||
extern unsigned long current_stub_stack(void);
|
||||
|
||||
static void get_skas_faultinfo(int pid, struct faultinfo *fi)
|
||||
{
|
||||
int err;
|
||||
|
||||
if (ptrace_faultinfo) {
|
||||
err = ptrace(PTRACE_FAULTINFO, pid, 0, fi);
|
||||
if (err) {
|
||||
printk(UM_KERN_ERR "get_skas_faultinfo - "
|
||||
"PTRACE_FAULTINFO failed, errno = %d\n", errno);
|
||||
fatal_sigsegv();
|
||||
}
|
||||
|
||||
/* Special handling for i386, which has different structs */
|
||||
if (sizeof(struct ptrace_faultinfo) < sizeof(struct faultinfo))
|
||||
memset((char *)fi + sizeof(struct ptrace_faultinfo), 0,
|
||||
sizeof(struct faultinfo) -
|
||||
sizeof(struct ptrace_faultinfo));
|
||||
}
|
||||
else {
|
||||
unsigned long fpregs[FP_SIZE];
|
||||
|
||||
err = get_fp_registers(pid, fpregs);
|
||||
if (err < 0) {
|
||||
printk(UM_KERN_ERR "save_fp_registers returned %d\n",
|
||||
err);
|
||||
fatal_sigsegv();
|
||||
}
|
||||
err = ptrace(PTRACE_CONT, pid, 0, SIGSEGV);
|
||||
if (err) {
|
||||
printk(UM_KERN_ERR "Failed to continue stub, pid = %d, "
|
||||
"errno = %d\n", pid, errno);
|
||||
fatal_sigsegv();
|
||||
}
|
||||
wait_stub_done(pid);
|
||||
|
||||
/*
|
||||
* faultinfo is prepared by the stub-segv-handler at start of
|
||||
* the stub stack page. We just have to copy it.
|
||||
*/
|
||||
memcpy(fi, (void *)current_stub_stack(), sizeof(*fi));
|
||||
|
||||
err = put_fp_registers(pid, fpregs);
|
||||
if (err < 0) {
|
||||
printk(UM_KERN_ERR "put_fp_registers returned %d\n",
|
||||
err);
|
||||
fatal_sigsegv();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static void handle_segv(int pid, struct uml_pt_regs * regs)
|
||||
{
|
||||
get_skas_faultinfo(pid, ®s->faultinfo);
|
||||
segv(regs->faultinfo, 0, 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, struct uml_pt_regs *regs,
|
||||
int local_using_sysemu)
|
||||
{
|
||||
int err, status;
|
||||
|
||||
if ((UPT_IP(regs) >= STUB_START) && (UPT_IP(regs) < STUB_END))
|
||||
fatal_sigsegv();
|
||||
|
||||
/* Mark this as a syscall */
|
||||
UPT_SYSCALL_NR(regs) = PT_SYSCALL_NR(regs->gp);
|
||||
|
||||
if (!local_using_sysemu)
|
||||
{
|
||||
err = ptrace(PTRACE_POKEUSER, pid, PT_SYSCALL_NR_OFFSET,
|
||||
__NR_getpid);
|
||||
if (err < 0) {
|
||||
printk(UM_KERN_ERR "handle_trap - nullifying syscall "
|
||||
"failed, errno = %d\n", errno);
|
||||
fatal_sigsegv();
|
||||
}
|
||||
|
||||
err = ptrace(PTRACE_SYSCALL, pid, 0, 0);
|
||||
if (err < 0) {
|
||||
printk(UM_KERN_ERR "handle_trap - continuing to end of "
|
||||
"syscall failed, errno = %d\n", errno);
|
||||
fatal_sigsegv();
|
||||
}
|
||||
|
||||
CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED | __WALL));
|
||||
if ((err < 0) || !WIFSTOPPED(status) ||
|
||||
(WSTOPSIG(status) != SIGTRAP + 0x80)) {
|
||||
err = ptrace_dump_regs(pid);
|
||||
if (err)
|
||||
printk(UM_KERN_ERR "Failed to get registers "
|
||||
"from process, errno = %d\n", -err);
|
||||
printk(UM_KERN_ERR "handle_trap - failed to wait at "
|
||||
"end of syscall, errno = %d, status = %d\n",
|
||||
errno, status);
|
||||
fatal_sigsegv();
|
||||
}
|
||||
}
|
||||
|
||||
handle_syscall(regs);
|
||||
}
|
||||
|
||||
extern int __syscall_stub_start;
|
||||
|
||||
static int userspace_tramp(void *stack)
|
||||
{
|
||||
void *addr;
|
||||
int err;
|
||||
|
||||
ptrace(PTRACE_TRACEME, 0, 0, 0);
|
||||
|
||||
signal(SIGTERM, SIG_DFL);
|
||||
signal(SIGWINCH, SIG_IGN);
|
||||
err = set_interval();
|
||||
if (err) {
|
||||
printk(UM_KERN_ERR "userspace_tramp - setting timer failed, "
|
||||
"errno = %d\n", err);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
if (!proc_mm) {
|
||||
/*
|
||||
* This has a pte, but it can't be mapped in with the usual
|
||||
* tlb_flush mechanism because this is part of that mechanism
|
||||
*/
|
||||
int fd;
|
||||
unsigned long long offset;
|
||||
fd = phys_mapping(to_phys(&__syscall_stub_start), &offset);
|
||||
addr = mmap64((void *) STUB_CODE, UM_KERN_PAGE_SIZE,
|
||||
PROT_EXEC, MAP_FIXED | MAP_PRIVATE, fd, offset);
|
||||
if (addr == MAP_FAILED) {
|
||||
printk(UM_KERN_ERR "mapping mmap stub at 0x%lx failed, "
|
||||
"errno = %d\n", STUB_CODE, errno);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
if (stack != NULL) {
|
||||
fd = phys_mapping(to_phys(stack), &offset);
|
||||
addr = mmap((void *) STUB_DATA,
|
||||
UM_KERN_PAGE_SIZE, PROT_READ | PROT_WRITE,
|
||||
MAP_FIXED | MAP_SHARED, fd, offset);
|
||||
if (addr == MAP_FAILED) {
|
||||
printk(UM_KERN_ERR "mapping segfault stack "
|
||||
"at 0x%lx failed, errno = %d\n",
|
||||
STUB_DATA, errno);
|
||||
exit(1);
|
||||
}
|
||||
}
|
||||
}
|
||||
if (!ptrace_faultinfo && (stack != NULL)) {
|
||||
struct sigaction sa;
|
||||
|
||||
unsigned long v = STUB_CODE +
|
||||
(unsigned long) stub_segv_handler -
|
||||
(unsigned long) &__syscall_stub_start;
|
||||
|
||||
set_sigstack((void *) STUB_DATA, UM_KERN_PAGE_SIZE);
|
||||
sigemptyset(&sa.sa_mask);
|
||||
sa.sa_flags = SA_ONSTACK | SA_NODEFER | SA_SIGINFO;
|
||||
sa.sa_sigaction = (void *) v;
|
||||
sa.sa_restorer = NULL;
|
||||
if (sigaction(SIGSEGV, &sa, NULL) < 0) {
|
||||
printk(UM_KERN_ERR "userspace_tramp - setting SIGSEGV "
|
||||
"handler failed - errno = %d\n", errno);
|
||||
exit(1);
|
||||
}
|
||||
}
|
||||
|
||||
kill(os_getpid(), SIGSTOP);
|
||||
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];
|
||||
|
||||
int start_userspace(unsigned long stub_stack)
|
||||
{
|
||||
void *stack;
|
||||
unsigned long sp;
|
||||
int pid, status, n, flags, err;
|
||||
|
||||
stack = mmap(NULL, UM_KERN_PAGE_SIZE,
|
||||
PROT_READ | PROT_WRITE | PROT_EXEC,
|
||||
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
|
||||
if (stack == MAP_FAILED) {
|
||||
err = -errno;
|
||||
printk(UM_KERN_ERR "start_userspace : mmap failed, "
|
||||
"errno = %d\n", errno);
|
||||
return err;
|
||||
}
|
||||
|
||||
sp = (unsigned long) stack + UM_KERN_PAGE_SIZE - sizeof(void *);
|
||||
|
||||
flags = CLONE_FILES;
|
||||
if (proc_mm)
|
||||
flags |= CLONE_VM;
|
||||
else
|
||||
flags |= SIGCHLD;
|
||||
|
||||
pid = clone(userspace_tramp, (void *) sp, flags, (void *) stub_stack);
|
||||
if (pid < 0) {
|
||||
err = -errno;
|
||||
printk(UM_KERN_ERR "start_userspace : clone failed, "
|
||||
"errno = %d\n", errno);
|
||||
return err;
|
||||
}
|
||||
|
||||
do {
|
||||
CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED | __WALL));
|
||||
if (n < 0) {
|
||||
err = -errno;
|
||||
printk(UM_KERN_ERR "start_userspace : wait failed, "
|
||||
"errno = %d\n", errno);
|
||||
goto out_kill;
|
||||
}
|
||||
} while (WIFSTOPPED(status) && (WSTOPSIG(status) == SIGVTALRM));
|
||||
|
||||
if (!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGSTOP)) {
|
||||
err = -EINVAL;
|
||||
printk(UM_KERN_ERR "start_userspace : expected SIGSTOP, got "
|
||||
"status = %d\n", status);
|
||||
goto out_kill;
|
||||
}
|
||||
|
||||
if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL,
|
||||
(void *) PTRACE_O_TRACESYSGOOD) < 0) {
|
||||
err = -errno;
|
||||
printk(UM_KERN_ERR "start_userspace : PTRACE_OLDSETOPTIONS "
|
||||
"failed, errno = %d\n", errno);
|
||||
goto out_kill;
|
||||
}
|
||||
|
||||
if (munmap(stack, UM_KERN_PAGE_SIZE) < 0) {
|
||||
err = -errno;
|
||||
printk(UM_KERN_ERR "start_userspace : munmap failed, "
|
||||
"errno = %d\n", errno);
|
||||
goto out_kill;
|
||||
}
|
||||
|
||||
return pid;
|
||||
|
||||
out_kill:
|
||||
os_kill_ptraced_process(pid, 1);
|
||||
return err;
|
||||
}
|
||||
|
||||
void userspace(struct uml_pt_regs *regs)
|
||||
{
|
||||
struct itimerval timer;
|
||||
unsigned long long nsecs, now;
|
||||
int err, status, op, pid = userspace_pid[0];
|
||||
/* To prevent races if using_sysemu changes under us.*/
|
||||
int local_using_sysemu;
|
||||
siginfo_t si;
|
||||
|
||||
/* Handle any immediate reschedules or signals */
|
||||
interrupt_end();
|
||||
|
||||
if (getitimer(ITIMER_VIRTUAL, &timer))
|
||||
printk(UM_KERN_ERR "Failed to get itimer, errno = %d\n", errno);
|
||||
nsecs = timer.it_value.tv_sec * UM_NSEC_PER_SEC +
|
||||
timer.it_value.tv_usec * UM_NSEC_PER_USEC;
|
||||
nsecs += os_nsecs();
|
||||
|
||||
while (1) {
|
||||
/*
|
||||
* This can legitimately fail if the process loads a
|
||||
* bogus value into a segment register. It will
|
||||
* segfault and PTRACE_GETREGS will read that value
|
||||
* out of the process. However, PTRACE_SETREGS will
|
||||
* fail. In this case, there is nothing to do but
|
||||
* just kill the process.
|
||||
*/
|
||||
if (ptrace(PTRACE_SETREGS, pid, 0, regs->gp))
|
||||
fatal_sigsegv();
|
||||
|
||||
if (put_fp_registers(pid, regs->fp))
|
||||
fatal_sigsegv();
|
||||
|
||||
/* 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));
|
||||
|
||||
if (ptrace(op, pid, 0, 0)) {
|
||||
printk(UM_KERN_ERR "userspace - ptrace continue "
|
||||
"failed, op = %d, errno = %d\n", op, errno);
|
||||
fatal_sigsegv();
|
||||
}
|
||||
|
||||
CATCH_EINTR(err = waitpid(pid, &status, WUNTRACED | __WALL));
|
||||
if (err < 0) {
|
||||
printk(UM_KERN_ERR "userspace - wait failed, "
|
||||
"errno = %d\n", errno);
|
||||
fatal_sigsegv();
|
||||
}
|
||||
|
||||
regs->is_user = 1;
|
||||
if (ptrace(PTRACE_GETREGS, pid, 0, regs->gp)) {
|
||||
printk(UM_KERN_ERR "userspace - PTRACE_GETREGS failed, "
|
||||
"errno = %d\n", errno);
|
||||
fatal_sigsegv();
|
||||
}
|
||||
|
||||
if (get_fp_registers(pid, regs->fp)) {
|
||||
printk(UM_KERN_ERR "userspace - get_fp_registers failed, "
|
||||
"errno = %d\n", errno);
|
||||
fatal_sigsegv();
|
||||
}
|
||||
|
||||
UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */
|
||||
|
||||
if (WIFSTOPPED(status)) {
|
||||
int sig = WSTOPSIG(status);
|
||||
|
||||
ptrace(PTRACE_GETSIGINFO, pid, 0, &si);
|
||||
|
||||
switch (sig) {
|
||||
case SIGSEGV:
|
||||
if (PTRACE_FULL_FAULTINFO ||
|
||||
!ptrace_faultinfo) {
|
||||
get_skas_faultinfo(pid,
|
||||
®s->faultinfo);
|
||||
(*sig_info[SIGSEGV])(SIGSEGV, &si,
|
||||
regs);
|
||||
}
|
||||
else handle_segv(pid, regs);
|
||||
break;
|
||||
case SIGTRAP + 0x80:
|
||||
handle_trap(pid, regs, local_using_sysemu);
|
||||
break;
|
||||
case SIGTRAP:
|
||||
relay_signal(SIGTRAP, &si, regs);
|
||||
break;
|
||||
case SIGVTALRM:
|
||||
now = os_nsecs();
|
||||
if (now < nsecs)
|
||||
break;
|
||||
block_signals();
|
||||
(*sig_info[sig])(sig, &si, regs);
|
||||
unblock_signals();
|
||||
nsecs = timer.it_value.tv_sec *
|
||||
UM_NSEC_PER_SEC +
|
||||
timer.it_value.tv_usec *
|
||||
UM_NSEC_PER_USEC;
|
||||
nsecs += os_nsecs();
|
||||
break;
|
||||
case SIGIO:
|
||||
case SIGILL:
|
||||
case SIGBUS:
|
||||
case SIGFPE:
|
||||
case SIGWINCH:
|
||||
block_signals();
|
||||
(*sig_info[sig])(sig, &si, regs);
|
||||
unblock_signals();
|
||||
break;
|
||||
default:
|
||||
printk(UM_KERN_ERR "userspace - child stopped "
|
||||
"with signal %d\n", sig);
|
||||
fatal_sigsegv();
|
||||
}
|
||||
pid = userspace_pid[0];
|
||||
interrupt_end();
|
||||
|
||||
/* Avoid -ERESTARTSYS handling in host */
|
||||
if (PT_SYSCALL_NR_OFFSET != PT_SYSCALL_RET_OFFSET)
|
||||
PT_SYSCALL_NR(regs->gp) = -1;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
static unsigned long thread_regs[MAX_REG_NR];
|
||||
static unsigned long thread_fp_regs[FP_SIZE];
|
||||
|
||||
static int __init init_thread_regs(void)
|
||||
{
|
||||
get_safe_registers(thread_regs, thread_fp_regs);
|
||||
/* Set parent's instruction pointer to start of clone-stub */
|
||||
thread_regs[REGS_IP_INDEX] = STUB_CODE +
|
||||
(unsigned long) stub_clone_handler -
|
||||
(unsigned long) &__syscall_stub_start;
|
||||
thread_regs[REGS_SP_INDEX] = STUB_DATA + UM_KERN_PAGE_SIZE -
|
||||
sizeof(void *);
|
||||
#ifdef __SIGNAL_FRAMESIZE
|
||||
thread_regs[REGS_SP_INDEX] -= __SIGNAL_FRAMESIZE;
|
||||
#endif
|
||||
return 0;
|
||||
}
|
||||
|
||||
__initcall(init_thread_regs);
|
||||
|
||||
int copy_context_skas0(unsigned long new_stack, int pid)
|
||||
{
|
||||
struct timeval tv = { .tv_sec = 0, .tv_usec = UM_USEC_PER_SEC / UM_HZ };
|
||||
int err;
|
||||
unsigned long current_stack = current_stub_stack();
|
||||
struct stub_data *data = (struct stub_data *) current_stack;
|
||||
struct stub_data *child_data = (struct stub_data *) new_stack;
|
||||
unsigned long long new_offset;
|
||||
int new_fd = phys_mapping(to_phys((void *)new_stack), &new_offset);
|
||||
|
||||
/*
|
||||
* prepare offset and fd of child's stack as argument for parent's
|
||||
* and child's mmap2 calls
|
||||
*/
|
||||
*data = ((struct stub_data) { .offset = MMAP_OFFSET(new_offset),
|
||||
.fd = new_fd,
|
||||
.timer = ((struct itimerval)
|
||||
{ .it_value = tv,
|
||||
.it_interval = tv }) });
|
||||
|
||||
err = ptrace_setregs(pid, thread_regs);
|
||||
if (err < 0) {
|
||||
err = -errno;
|
||||
printk(UM_KERN_ERR "copy_context_skas0 : PTRACE_SETREGS "
|
||||
"failed, pid = %d, errno = %d\n", pid, -err);
|
||||
return err;
|
||||
}
|
||||
|
||||
err = put_fp_registers(pid, thread_fp_regs);
|
||||
if (err < 0) {
|
||||
printk(UM_KERN_ERR "copy_context_skas0 : put_fp_registers "
|
||||
"failed, pid = %d, err = %d\n", pid, err);
|
||||
return err;
|
||||
}
|
||||
|
||||
/* set a well known return code for detection of child write failure */
|
||||
child_data->err = 12345678;
|
||||
|
||||
/*
|
||||
* Wait, until parent has finished its work: read child's pid from
|
||||
* parent's stack, and check, if bad result.
|
||||
*/
|
||||
err = ptrace(PTRACE_CONT, pid, 0, 0);
|
||||
if (err) {
|
||||
err = -errno;
|
||||
printk(UM_KERN_ERR "Failed to continue new process, pid = %d, "
|
||||
"errno = %d\n", pid, errno);
|
||||
return err;
|
||||
}
|
||||
|
||||
wait_stub_done(pid);
|
||||
|
||||
pid = data->err;
|
||||
if (pid < 0) {
|
||||
printk(UM_KERN_ERR "copy_context_skas0 - stub-parent reports "
|
||||
"error %d\n", -pid);
|
||||
return pid;
|
||||
}
|
||||
|
||||
/*
|
||||
* Wait, until child has finished too: read child's result from
|
||||
* child's stack and check it.
|
||||
*/
|
||||
wait_stub_done(pid);
|
||||
if (child_data->err != STUB_DATA) {
|
||||
printk(UM_KERN_ERR "copy_context_skas0 - stub-child reports "
|
||||
"error %ld\n", child_data->err);
|
||||
err = child_data->err;
|
||||
goto out_kill;
|
||||
}
|
||||
|
||||
if (ptrace(PTRACE_OLDSETOPTIONS, pid, NULL,
|
||||
(void *)PTRACE_O_TRACESYSGOOD) < 0) {
|
||||
err = -errno;
|
||||
printk(UM_KERN_ERR "copy_context_skas0 : PTRACE_OLDSETOPTIONS "
|
||||
"failed, errno = %d\n", errno);
|
||||
goto out_kill;
|
||||
}
|
||||
|
||||
return pid;
|
||||
|
||||
out_kill:
|
||||
os_kill_ptraced_process(pid, 1);
|
||||
return err;
|
||||
}
|
||||
|
||||
/*
|
||||
* This is used only, if stub pages are needed, while proc_mm is
|
||||
* available. Opening /proc/mm creates a new mm_context, which lacks
|
||||
* the stub-pages. Thus, we map them using /proc/mm-fd
|
||||
*/
|
||||
int map_stub_pages(int fd, unsigned long code, unsigned long data,
|
||||
unsigned long stack)
|
||||
{
|
||||
struct proc_mm_op mmop;
|
||||
int n;
|
||||
unsigned long long code_offset;
|
||||
int code_fd = phys_mapping(to_phys((void *) &__syscall_stub_start),
|
||||
&code_offset);
|
||||
|
||||
mmop = ((struct proc_mm_op) { .op = MM_MMAP,
|
||||
.u =
|
||||
{ .mmap =
|
||||
{ .addr = code,
|
||||
.len = UM_KERN_PAGE_SIZE,
|
||||
.prot = PROT_EXEC,
|
||||
.flags = MAP_FIXED | MAP_PRIVATE,
|
||||
.fd = code_fd,
|
||||
.offset = code_offset
|
||||
} } });
|
||||
CATCH_EINTR(n = write(fd, &mmop, sizeof(mmop)));
|
||||
if (n != sizeof(mmop)) {
|
||||
n = errno;
|
||||
printk(UM_KERN_ERR "mmap args - addr = 0x%lx, fd = %d, "
|
||||
"offset = %llx\n", code, code_fd,
|
||||
(unsigned long long) code_offset);
|
||||
printk(UM_KERN_ERR "map_stub_pages : /proc/mm map for code "
|
||||
"failed, err = %d\n", n);
|
||||
return -n;
|
||||
}
|
||||
|
||||
if (stack) {
|
||||
unsigned long long map_offset;
|
||||
int map_fd = phys_mapping(to_phys((void *)stack), &map_offset);
|
||||
mmop = ((struct proc_mm_op)
|
||||
{ .op = MM_MMAP,
|
||||
.u =
|
||||
{ .mmap =
|
||||
{ .addr = data,
|
||||
.len = UM_KERN_PAGE_SIZE,
|
||||
.prot = PROT_READ | PROT_WRITE,
|
||||
.flags = MAP_FIXED | MAP_SHARED,
|
||||
.fd = map_fd,
|
||||
.offset = map_offset
|
||||
} } });
|
||||
CATCH_EINTR(n = write(fd, &mmop, sizeof(mmop)));
|
||||
if (n != sizeof(mmop)) {
|
||||
n = errno;
|
||||
printk(UM_KERN_ERR "map_stub_pages : /proc/mm map for "
|
||||
"data failed, err = %d\n", n);
|
||||
return -n;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void new_thread(void *stack, jmp_buf *buf, void (*handler)(void))
|
||||
{
|
||||
(*buf)[0].JB_IP = (unsigned long) handler;
|
||||
(*buf)[0].JB_SP = (unsigned long) stack + UM_THREAD_SIZE -
|
||||
sizeof(void *);
|
||||
}
|
||||
|
||||
#define INIT_JMP_NEW_THREAD 0
|
||||
#define INIT_JMP_CALLBACK 1
|
||||
#define INIT_JMP_HALT 2
|
||||
#define INIT_JMP_REBOOT 3
|
||||
|
||||
void switch_threads(jmp_buf *me, jmp_buf *you)
|
||||
{
|
||||
if (UML_SETJMP(me) == 0)
|
||||
UML_LONGJMP(you, 1);
|
||||
}
|
||||
|
||||
static jmp_buf initial_jmpbuf;
|
||||
|
||||
/* XXX Make these percpu */
|
||||
static void (*cb_proc)(void *arg);
|
||||
static void *cb_arg;
|
||||
static jmp_buf *cb_back;
|
||||
|
||||
int start_idle_thread(void *stack, jmp_buf *switch_buf)
|
||||
{
|
||||
int n;
|
||||
|
||||
set_handler(SIGWINCH);
|
||||
|
||||
/*
|
||||
* Can't use UML_SETJMP or UML_LONGJMP here because they save
|
||||
* and restore signals, with the possible side-effect of
|
||||
* trying to handle any signals which came when they were
|
||||
* blocked, which can't be done on this stack.
|
||||
* Signals must be blocked when jumping back here and restored
|
||||
* after returning to the jumper.
|
||||
*/
|
||||
n = setjmp(initial_jmpbuf);
|
||||
switch (n) {
|
||||
case INIT_JMP_NEW_THREAD:
|
||||
(*switch_buf)[0].JB_IP = (unsigned long) new_thread_handler;
|
||||
(*switch_buf)[0].JB_SP = (unsigned long) stack +
|
||||
UM_THREAD_SIZE - sizeof(void *);
|
||||
break;
|
||||
case INIT_JMP_CALLBACK:
|
||||
(*cb_proc)(cb_arg);
|
||||
longjmp(*cb_back, 1);
|
||||
break;
|
||||
case INIT_JMP_HALT:
|
||||
kmalloc_ok = 0;
|
||||
return 0;
|
||||
case INIT_JMP_REBOOT:
|
||||
kmalloc_ok = 0;
|
||||
return 1;
|
||||
default:
|
||||
printk(UM_KERN_ERR "Bad sigsetjmp return in "
|
||||
"start_idle_thread - %d\n", n);
|
||||
fatal_sigsegv();
|
||||
}
|
||||
longjmp(*switch_buf, 1);
|
||||
}
|
||||
|
||||
void initial_thread_cb_skas(void (*proc)(void *), void *arg)
|
||||
{
|
||||
jmp_buf here;
|
||||
|
||||
cb_proc = proc;
|
||||
cb_arg = arg;
|
||||
cb_back = &here;
|
||||
|
||||
block_signals();
|
||||
if (UML_SETJMP(&here) == 0)
|
||||
UML_LONGJMP(&initial_jmpbuf, INIT_JMP_CALLBACK);
|
||||
unblock_signals();
|
||||
|
||||
cb_proc = NULL;
|
||||
cb_arg = NULL;
|
||||
cb_back = NULL;
|
||||
}
|
||||
|
||||
void halt_skas(void)
|
||||
{
|
||||
block_signals();
|
||||
UML_LONGJMP(&initial_jmpbuf, INIT_JMP_HALT);
|
||||
}
|
||||
|
||||
void reboot_skas(void)
|
||||
{
|
||||
block_signals();
|
||||
UML_LONGJMP(&initial_jmpbuf, INIT_JMP_REBOOT);
|
||||
}
|
||||
|
||||
void __switch_mm(struct mm_id *mm_idp)
|
||||
{
|
||||
int err;
|
||||
|
||||
/* FIXME: need cpu pid in __switch_mm */
|
||||
if (proc_mm) {
|
||||
err = ptrace(PTRACE_SWITCH_MM, userspace_pid[0], 0,
|
||||
mm_idp->u.mm_fd);
|
||||
if (err) {
|
||||
printk(UM_KERN_ERR "__switch_mm - PTRACE_SWITCH_MM "
|
||||
"failed, errno = %d\n", errno);
|
||||
fatal_sigsegv();
|
||||
}
|
||||
}
|
||||
else userspace_pid[0] = mm_idp->u.pid;
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue