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