uml: stop using libc asm/page.h
[linux-2.6.git] / arch / um / os-Linux / skas / mem.c
1 /*
2  * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
3  * Licensed under the GPL
4  */
5
6 #include <signal.h>
7 #include <errno.h>
8 #include <string.h>
9 #include <unistd.h>
10 #include <sys/mman.h>
11 #include <sys/wait.h>
12 #include <asm/unistd.h>
13 #include "mem_user.h"
14 #include "mem.h"
15 #include "skas.h"
16 #include "user.h"
17 #include "os.h"
18 #include "proc_mm.h"
19 #include "ptrace_user.h"
20 #include "kern_util.h"
21 #include "task.h"
22 #include "registers.h"
23 #include "uml-config.h"
24 #include "sysdep/ptrace.h"
25 #include "sysdep/stub.h"
26 #include "init.h"
27 #include "kern_constants.h"
28
29 extern unsigned long batch_syscall_stub, __syscall_stub_start;
30
31 extern void wait_stub_done(int pid);
32
33 static inline unsigned long *check_init_stack(struct mm_id * mm_idp,
34                                               unsigned long *stack)
35 {
36         if(stack == NULL) {
37                 stack = (unsigned long *) mm_idp->stack + 2;
38                 *stack = 0;
39         }
40         return stack;
41 }
42
43 static unsigned long syscall_regs[MAX_REG_NR];
44
45 static int __init init_syscall_regs(void)
46 {
47         get_safe_registers(syscall_regs, NULL);
48         syscall_regs[REGS_IP_INDEX] = UML_CONFIG_STUB_CODE +
49                 ((unsigned long) &batch_syscall_stub -
50                  (unsigned long) &__syscall_stub_start);
51         return 0;
52 }
53
54 __initcall(init_syscall_regs);
55
56 extern int proc_mm;
57
58 int single_count = 0;
59 int multi_count = 0;
60 int multi_op_count = 0;
61
62 static inline long do_syscall_stub(struct mm_id * mm_idp, void **addr)
63 {
64         int n, i;
65         long ret, offset;
66         unsigned long * data;
67         unsigned long * syscall;
68         int err, pid = mm_idp->u.pid;
69
70         if(proc_mm)
71                 /* FIXME: Need to look up userspace_pid by cpu */
72                 pid = userspace_pid[0];
73
74         multi_count++;
75
76         n = ptrace_setregs(pid, syscall_regs);
77         if(n < 0){
78                 printk("Registers - \n");
79                 for(i = 0; i < MAX_REG_NR; i++)
80                         printk("\t%d\t0x%lx\n", i, syscall_regs[i]);
81                 panic("do_syscall_stub : PTRACE_SETREGS failed, errno = %d\n",
82                       -n);
83         }
84
85         err = ptrace(PTRACE_CONT, pid, 0, 0);
86         if(err)
87                 panic("Failed to continue stub, pid = %d, errno = %d\n", pid,
88                       errno);
89
90         wait_stub_done(pid);
91
92         /* When the stub stops, we find the following values on the
93          * beginning of the stack:
94          * (long )return_value
95          * (long )offset to failed sycall-data (0, if no error)
96          */
97         ret = *((unsigned long *) mm_idp->stack);
98         offset = *((unsigned long *) mm_idp->stack + 1);
99         if (offset) {
100                 data = (unsigned long *)(mm_idp->stack +
101                                          offset - UML_CONFIG_STUB_DATA);
102                 printk("do_syscall_stub : ret = %ld, offset = %ld, "
103                        "data = %p\n", ret, offset, data);
104                 syscall = (unsigned long *)((unsigned long)data + data[0]);
105                 printk("do_syscall_stub: syscall %ld failed, return value = "
106                        "0x%lx, expected return value = 0x%lx\n",
107                        syscall[0], ret, syscall[7]);
108                 printk("    syscall parameters: "
109                        "0x%lx 0x%lx 0x%lx 0x%lx 0x%lx 0x%lx\n",
110                        syscall[1], syscall[2], syscall[3],
111                        syscall[4], syscall[5], syscall[6]);
112                 for(n = 1; n < data[0]/sizeof(long); n++) {
113                         if(n == 1)
114                                 printk("    additional syscall data:");
115                         if(n % 4 == 1)
116                                 printk("\n      ");
117                         printk("  0x%lx", data[n]);
118                 }
119                 if(n > 1)
120                         printk("\n");
121         }
122         else ret = 0;
123
124         *addr = check_init_stack(mm_idp, NULL);
125
126         return ret;
127 }
128
129 long run_syscall_stub(struct mm_id * mm_idp, int syscall,
130                       unsigned long *args, long expected, void **addr,
131                       int done)
132 {
133         unsigned long *stack = check_init_stack(mm_idp, *addr);
134
135         if(done && *addr == NULL)
136                 single_count++;
137
138         *stack += sizeof(long);
139         stack += *stack / sizeof(long);
140
141         *stack++ = syscall;
142         *stack++ = args[0];
143         *stack++ = args[1];
144         *stack++ = args[2];
145         *stack++ = args[3];
146         *stack++ = args[4];
147         *stack++ = args[5];
148         *stack++ = expected;
149         *stack = 0;
150         multi_op_count++;
151
152         if(!done && ((((unsigned long) stack) & ~UM_KERN_PAGE_MASK) <
153                      UM_KERN_PAGE_SIZE - 10 * sizeof(long))){
154                 *addr = stack;
155                 return 0;
156         }
157
158         return do_syscall_stub(mm_idp, addr);
159 }
160
161 long syscall_stub_data(struct mm_id * mm_idp,
162                        unsigned long *data, int data_count,
163                        void **addr, void **stub_addr)
164 {
165         unsigned long *stack;
166         int ret = 0;
167
168         /* If *addr still is uninitialized, it *must* contain NULL.
169          * Thus in this case do_syscall_stub correctly won't be called.
170          */
171         if((((unsigned long) *addr) & ~UM_KERN_PAGE_MASK) >=
172            UM_KERN_PAGE_SIZE - (10 + data_count) * sizeof(long)) {
173                 ret = do_syscall_stub(mm_idp, addr);
174                 /* in case of error, don't overwrite data on stack */
175                 if(ret)
176                         return ret;
177         }
178
179         stack = check_init_stack(mm_idp, *addr);
180         *addr = stack;
181
182         *stack = data_count * sizeof(long);
183
184         memcpy(stack + 1, data, data_count * sizeof(long));
185
186         *stub_addr = (void *)(((unsigned long)(stack + 1) &
187                                ~UM_KERN_PAGE_MASK) + UML_CONFIG_STUB_DATA);
188
189         return 0;
190 }
191
192 int map(struct mm_id * mm_idp, unsigned long virt, unsigned long len, int prot,
193         int phys_fd, unsigned long long offset, int done, void **data)
194 {
195         int ret;
196
197         if(proc_mm){
198                 struct proc_mm_op map;
199                 int fd = mm_idp->u.mm_fd;
200
201                 map = ((struct proc_mm_op) { .op        = MM_MMAP,
202                                        .u               =
203                                        { .mmap  =
204                                          { .addr        = virt,
205                                            .len = len,
206                                            .prot        = prot,
207                                            .flags       = MAP_SHARED |
208                                            MAP_FIXED,
209                                            .fd  = phys_fd,
210                                            .offset= offset
211                                          } } } );
212                 CATCH_EINTR(ret = write(fd, &map, sizeof(map)));
213                 if(ret != sizeof(map)){
214                         ret = -errno;
215                         printk("map : /proc/mm map failed, err = %d\n", -ret);
216                 }
217                 else ret = 0;
218         }
219         else {
220                 unsigned long args[] = { virt, len, prot,
221                                          MAP_SHARED | MAP_FIXED, phys_fd,
222                                          MMAP_OFFSET(offset) };
223
224                 ret = run_syscall_stub(mm_idp, STUB_MMAP_NR, args, virt,
225                                        data, done);
226         }
227
228         return ret;
229 }
230
231 int unmap(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
232           int done, void **data)
233 {
234         int ret;
235
236         if(proc_mm){
237                 struct proc_mm_op unmap;
238                 int fd = mm_idp->u.mm_fd;
239
240                 unmap = ((struct proc_mm_op) { .op      = MM_MUNMAP,
241                                          .u     =
242                                          { .munmap      =
243                                            { .addr      =
244                                              (unsigned long) addr,
245                                              .len               = len } } } );
246                 CATCH_EINTR(ret = write(fd, &unmap, sizeof(unmap)));
247                 if(ret != sizeof(unmap)){
248                         ret = -errno;
249                         printk("unmap - proc_mm write returned %d\n", ret);
250                 }
251                 else ret = 0;
252         }
253         else {
254                 unsigned long args[] = { (unsigned long) addr, len, 0, 0, 0,
255                                          0 };
256
257                 ret = run_syscall_stub(mm_idp, __NR_munmap, args, 0,
258                                        data, done);
259         }
260
261         return ret;
262 }
263
264 int protect(struct mm_id * mm_idp, unsigned long addr, unsigned long len,
265             unsigned int prot, int done, void **data)
266 {
267         struct proc_mm_op protect;
268         int ret;
269
270         if(proc_mm){
271                 int fd = mm_idp->u.mm_fd;
272
273                 protect = ((struct proc_mm_op) { .op    = MM_MPROTECT,
274                                            .u   =
275                                            { .mprotect  =
276                                              { .addr    =
277                                                (unsigned long) addr,
278                                                .len     = len,
279                                                .prot    = prot } } } );
280
281                 CATCH_EINTR(ret = write(fd, &protect, sizeof(protect)));
282                 if(ret != sizeof(protect)){
283                         ret = -errno;
284                         printk("protect failed, err = %d", -ret);
285                 }
286                 else ret = 0;
287         }
288         else {
289                 unsigned long args[] = { addr, len, prot, 0, 0, 0 };
290
291                 ret = run_syscall_stub(mm_idp, __NR_mprotect, args, 0,
292                                        data, done);
293         }
294
295         return ret;
296 }
297
298 void before_mem_skas(unsigned long unused)
299 {
300 }