2 * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3 * Licensed under the GPL
12 #include <as-layout.h>
16 #include <ptrace_user.h>
17 #include <registers.h>
19 #include <sysdep/ptrace.h>
20 #include <sysdep/stub.h>
22 extern unsigned long batch_syscall_stub, __syscall_stub_start;
24 extern void wait_stub_done(int pid);
26 static inline unsigned long *check_init_stack(struct mm_id * mm_idp,
30 stack = (unsigned long *) mm_idp->stack + 2;
36 static unsigned long syscall_regs[MAX_REG_NR];
38 static int __init init_syscall_regs(void)
40 get_safe_registers(syscall_regs, NULL);
41 syscall_regs[REGS_IP_INDEX] = STUB_CODE +
42 ((unsigned long) &batch_syscall_stub -
43 (unsigned long) &__syscall_stub_start);
47 __initcall(init_syscall_regs);
51 static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
56 unsigned long * syscall;
57 int err, pid = mm_idp->u.pid;
60 /* FIXME: Need to look up userspace_pid by cpu */
61 pid = userspace_pid[0];
63 n = ptrace_setregs(pid, syscall_regs);
65 printk(UM_KERN_ERR "Registers - \n");
66 for (i = 0; i < MAX_REG_NR; i++)
67 printk(UM_KERN_ERR "\t%d\t0x%lx\n", i, syscall_regs[i]);
68 panic("do_syscall_stub : PTRACE_SETREGS failed, errno = %d\n",
72 err = ptrace(PTRACE_CONT, pid, 0, 0);
74 panic("Failed to continue stub, pid = %d, errno = %d\n", pid,
80 * When the stub stops, we find the following values on the
81 * beginning of the stack:
83 * (long )offset to failed sycall-data (0, if no error)
85 ret = *((unsigned long *) mm_idp->stack);
86 offset = *((unsigned long *) mm_idp->stack + 1);
88 data = (unsigned long *)(mm_idp->stack + offset - STUB_DATA);
89 printk(UM_KERN_ERR "do_syscall_stub : ret = %ld, offset = %ld, "
90 "data = %p\n", ret, offset, data);
91 syscall = (unsigned long *)((unsigned long)data + data[0]);
92 printk(UM_KERN_ERR "do_syscall_stub: syscall %ld failed, "
93 "return value = 0x%lx, expected return value = 0x%lx\n",
94 syscall[0], ret, syscall[7]);
95 printk(UM_KERN_ERR " syscall parameters: "
96 "0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
97 syscall[1], syscall[2], syscall[3],
98 syscall[4], syscall[5], syscall[6]);
99 for (n = 1; n < data[0]/sizeof(long); n++) {
101 printk(UM_KERN_ERR " additional syscall "
104 printk("\n" UM_KERN_ERR " ");
105 printk(" 0x%lx", data[n]);
112 *addr = check_init_stack(mm_idp, NULL);
117 long run_syscall_stub(struct mm_id * mm_idp, int syscall,
118 unsigned long *args, long expected, void **addr,
121 unsigned long *stack = check_init_stack(mm_idp, *addr);
123 *stack += sizeof(long);
124 stack += *stack / sizeof(long);
136 if (!done && ((((unsigned long) stack) & ~UM_KERN_PAGE_MASK) <
137 UM_KERN_PAGE_SIZE - 10 * sizeof(long))) {
142 return do_syscall_stub(mm_idp, addr);
145 long syscall_stub_data(struct mm_id * mm_idp,
146 unsigned long *data, int data_count,
147 void **addr, void **stub_addr)
149 unsigned long *stack;
153 * If *addr still is uninitialized, it *must* contain NULL.
154 * Thus in this case do_syscall_stub correctly won't be called.
156 if ((((unsigned long) *addr) & ~UM_KERN_PAGE_MASK) >=
157 UM_KERN_PAGE_SIZE - (10 + data_count) * sizeof(long)) {
158 ret = do_syscall_stub(mm_idp, addr);
159 /* in case of error, don't overwrite data on stack */
164 stack = check_init_stack(mm_idp, *addr);
167 *stack = data_count * sizeof(long);
169 memcpy(stack + 1, data, data_count * sizeof(long));
171 *stub_addr = (void *)(((unsigned long)(stack + 1) &
172 ~UM_KERN_PAGE_MASK) + STUB_DATA);
177 int map(struct mm_id * mm_idp, unsigned long virt, unsigned long len, int prot,
178 int phys_fd, unsigned long long offset, int done, void **data)
183 struct proc_mm_op map;
184 int fd = mm_idp->u.mm_fd;
186 map = ((struct proc_mm_op) { .op = MM_MMAP,
192 .flags = MAP_SHARED |
197 CATCH_EINTR(ret = write(fd, &map, sizeof(map)));
198 if (ret != sizeof(map)) {
200 printk(UM_KERN_ERR "map : /proc/mm map failed, "
206 unsigned long args[] = { virt, len, prot,
207 MAP_SHARED | MAP_FIXED, phys_fd,
208 MMAP_OFFSET(offset) };
210 ret = run_syscall_stub(mm_idp, STUB_MMAP_NR, args, virt,
217 int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
218 int done, void **data)
223 struct proc_mm_op unmap;
224 int fd = mm_idp->u.mm_fd;
226 unmap = ((struct proc_mm_op) { .op = MM_MUNMAP,
230 (unsigned long) addr,
232 CATCH_EINTR(ret = write(fd, &unmap, sizeof(unmap)));
233 if (ret != sizeof(unmap)) {
235 printk(UM_KERN_ERR "unmap - proc_mm write returned "
241 unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0,
244 ret = run_syscall_stub(mm_idp, __NR_munmap, args, 0,
251 int protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
252 unsigned int prot, int done, void **data)
254 struct proc_mm_op protect;
258 int fd = mm_idp->u.mm_fd;
260 protect = ((struct proc_mm_op) { .op = MM_MPROTECT,
264 (unsigned long) addr,
266 .prot = prot } } } );
268 CATCH_EINTR(ret = write(fd, &protect, sizeof(protect)));
269 if (ret != sizeof(protect)) {
271 printk(UM_KERN_ERR "protect failed, err = %d", -ret);
276 unsigned long args[] = { addr, len, prot, 0, 0, 0 };
278 ret = run_syscall_stub(mm_idp, __NR_mprotect, args, 0,