296 lines
6.8 KiB
C
296 lines
6.8 KiB
C
/*
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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 "kern_constants.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 "user.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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int single_count = 0;
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int multi_count = 0;
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int multi_op_count = 0;
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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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multi_count++;
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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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if (done && *addr == NULL)
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single_count++;
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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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multi_op_count++;
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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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