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