Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /********************************************************************** |
| 2 | ptrace.c |
| 3 | |
| 4 | Copyright (C) 1999 Lars Brinkhoff. See the file COPYING for licensing |
| 5 | terms and conditions. |
| 6 | |
| 7 | Jeff Dike (jdike@karaya.com) : Modified for integration into uml |
| 8 | **********************************************************************/ |
| 9 | |
| 10 | #include <errno.h> |
| 11 | #include <unistd.h> |
| 12 | #include <signal.h> |
| 13 | #include <sys/types.h> |
| 14 | #include <sys/time.h> |
| 15 | #include <sys/wait.h> |
| 16 | |
| 17 | #include "ptproxy.h" |
| 18 | #include "debug.h" |
| 19 | #include "user_util.h" |
| 20 | #include "kern_util.h" |
| 21 | #include "ptrace_user.h" |
| 22 | #include "tt.h" |
| 23 | |
| 24 | long proxy_ptrace(struct debugger *debugger, int arg1, pid_t arg2, |
| 25 | long arg3, long arg4, pid_t child, int *ret) |
| 26 | { |
| 27 | sigset_t relay; |
| 28 | long result; |
| 29 | int status; |
| 30 | |
| 31 | *ret = 0; |
| 32 | if(debugger->debugee->died) return(-ESRCH); |
| 33 | |
| 34 | switch(arg1){ |
| 35 | case PTRACE_ATTACH: |
| 36 | if(debugger->debugee->traced) return(-EPERM); |
| 37 | |
| 38 | debugger->debugee->pid = arg2; |
| 39 | debugger->debugee->traced = 1; |
| 40 | |
| 41 | if(is_valid_pid(arg2) && (arg2 != child)){ |
| 42 | debugger->debugee->in_context = 0; |
| 43 | kill(arg2, SIGSTOP); |
| 44 | debugger->debugee->event = 1; |
| 45 | debugger->debugee->wait_status = W_STOPCODE(SIGSTOP); |
| 46 | } |
| 47 | else { |
| 48 | debugger->debugee->in_context = 1; |
| 49 | if(debugger->debugee->stopped) |
| 50 | child_proxy(child, W_STOPCODE(SIGSTOP)); |
| 51 | else kill(child, SIGSTOP); |
| 52 | } |
| 53 | |
| 54 | return(0); |
| 55 | |
| 56 | case PTRACE_DETACH: |
| 57 | if(!debugger->debugee->traced) return(-EPERM); |
| 58 | |
| 59 | debugger->debugee->traced = 0; |
| 60 | debugger->debugee->pid = 0; |
| 61 | if(!debugger->debugee->in_context) |
| 62 | kill(child, SIGCONT); |
| 63 | |
| 64 | return(0); |
| 65 | |
| 66 | case PTRACE_CONT: |
| 67 | if(!debugger->debugee->in_context) return(-EPERM); |
| 68 | *ret = PTRACE_CONT; |
| 69 | return(ptrace(PTRACE_CONT, child, arg3, arg4)); |
| 70 | |
| 71 | #ifdef UM_HAVE_GETFPREGS |
| 72 | case PTRACE_GETFPREGS: |
| 73 | { |
| 74 | long regs[FP_FRAME_SIZE]; |
| 75 | int i, result; |
| 76 | |
| 77 | result = ptrace(PTRACE_GETFPREGS, child, 0, regs); |
| 78 | if(result == -1) return(-errno); |
| 79 | |
| 80 | for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++) |
| 81 | ptrace(PTRACE_POKEDATA, debugger->pid, arg4 + 4 * i, |
| 82 | regs[i]); |
| 83 | return(result); |
| 84 | } |
| 85 | #endif |
| 86 | |
| 87 | #ifdef UM_HAVE_GETFPXREGS |
| 88 | case PTRACE_GETFPXREGS: |
| 89 | { |
| 90 | long regs[FPX_FRAME_SIZE]; |
| 91 | int i, result; |
| 92 | |
| 93 | result = ptrace(PTRACE_GETFPXREGS, child, 0, regs); |
| 94 | if(result == -1) return(-errno); |
| 95 | |
| 96 | for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++) |
| 97 | ptrace(PTRACE_POKEDATA, debugger->pid, arg4 + 4 * i, |
| 98 | regs[i]); |
| 99 | return(result); |
| 100 | } |
| 101 | #endif |
| 102 | |
| 103 | #ifdef UM_HAVE_GETREGS |
| 104 | case PTRACE_GETREGS: |
| 105 | { |
| 106 | long regs[FRAME_SIZE]; |
| 107 | int i, result; |
| 108 | |
| 109 | result = ptrace(PTRACE_GETREGS, child, 0, regs); |
| 110 | if(result == -1) return(-errno); |
| 111 | |
| 112 | for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++) |
| 113 | ptrace (PTRACE_POKEDATA, debugger->pid, |
| 114 | arg4 + 4 * i, regs[i]); |
| 115 | return(result); |
| 116 | } |
| 117 | break; |
| 118 | #endif |
| 119 | |
| 120 | case PTRACE_KILL: |
| 121 | result = ptrace(PTRACE_KILL, child, arg3, arg4); |
| 122 | if(result == -1) return(-errno); |
| 123 | |
| 124 | return(result); |
| 125 | |
| 126 | case PTRACE_PEEKDATA: |
| 127 | case PTRACE_PEEKTEXT: |
| 128 | case PTRACE_PEEKUSR: |
| 129 | /* The value being read out could be -1, so we have to |
| 130 | * check errno to see if there's an error, and zero it |
| 131 | * beforehand so we're not faked out by an old error |
| 132 | */ |
| 133 | |
| 134 | errno = 0; |
| 135 | result = ptrace(arg1, child, arg3, 0); |
| 136 | if((result == -1) && (errno != 0)) return(-errno); |
| 137 | |
| 138 | result = ptrace(PTRACE_POKEDATA, debugger->pid, arg4, result); |
| 139 | if(result == -1) return(-errno); |
| 140 | |
| 141 | return(result); |
| 142 | |
| 143 | case PTRACE_POKEDATA: |
| 144 | case PTRACE_POKETEXT: |
| 145 | case PTRACE_POKEUSR: |
| 146 | result = ptrace(arg1, child, arg3, arg4); |
| 147 | if(result == -1) return(-errno); |
| 148 | |
| 149 | if(arg1 == PTRACE_POKEUSR) ptrace_pokeuser(arg3, arg4); |
| 150 | return(result); |
| 151 | |
| 152 | #ifdef UM_HAVE_SETFPREGS |
| 153 | case PTRACE_SETFPREGS: |
| 154 | { |
| 155 | long regs[FP_FRAME_SIZE]; |
| 156 | int i; |
| 157 | |
| 158 | for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++) |
| 159 | regs[i] = ptrace (PTRACE_PEEKDATA, debugger->pid, |
| 160 | arg4 + 4 * i, 0); |
| 161 | result = ptrace(PTRACE_SETFPREGS, child, 0, regs); |
| 162 | if(result == -1) return(-errno); |
| 163 | |
| 164 | return(result); |
| 165 | } |
| 166 | #endif |
| 167 | |
| 168 | #ifdef UM_HAVE_SETFPXREGS |
| 169 | case PTRACE_SETFPXREGS: |
| 170 | { |
| 171 | long regs[FPX_FRAME_SIZE]; |
| 172 | int i; |
| 173 | |
| 174 | for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++) |
| 175 | regs[i] = ptrace (PTRACE_PEEKDATA, debugger->pid, |
| 176 | arg4 + 4 * i, 0); |
| 177 | result = ptrace(PTRACE_SETFPXREGS, child, 0, regs); |
| 178 | if(result == -1) return(-errno); |
| 179 | |
| 180 | return(result); |
| 181 | } |
| 182 | #endif |
| 183 | |
| 184 | #ifdef UM_HAVE_SETREGS |
| 185 | case PTRACE_SETREGS: |
| 186 | { |
| 187 | long regs[FRAME_SIZE]; |
| 188 | int i; |
| 189 | |
| 190 | for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++) |
| 191 | regs[i] = ptrace(PTRACE_PEEKDATA, debugger->pid, |
| 192 | arg4 + 4 * i, 0); |
| 193 | result = ptrace(PTRACE_SETREGS, child, 0, regs); |
| 194 | if(result == -1) return(-errno); |
| 195 | |
| 196 | return(result); |
| 197 | } |
| 198 | #endif |
| 199 | |
| 200 | case PTRACE_SINGLESTEP: |
| 201 | if(!debugger->debugee->in_context) return(-EPERM); |
| 202 | sigemptyset(&relay); |
| 203 | sigaddset(&relay, SIGSEGV); |
| 204 | sigaddset(&relay, SIGILL); |
| 205 | sigaddset(&relay, SIGBUS); |
| 206 | result = ptrace(PTRACE_SINGLESTEP, child, arg3, arg4); |
| 207 | if(result == -1) return(-errno); |
| 208 | |
| 209 | status = wait_for_stop(child, SIGTRAP, PTRACE_SINGLESTEP, |
| 210 | &relay); |
| 211 | child_proxy(child, status); |
| 212 | return(result); |
| 213 | |
| 214 | case PTRACE_SYSCALL: |
| 215 | if(!debugger->debugee->in_context) return(-EPERM); |
| 216 | result = ptrace(PTRACE_SYSCALL, child, arg3, arg4); |
| 217 | if(result == -1) return(-errno); |
| 218 | |
| 219 | *ret = PTRACE_SYSCALL; |
| 220 | return(result); |
| 221 | |
| 222 | case PTRACE_TRACEME: |
| 223 | default: |
| 224 | return(-EINVAL); |
| 225 | } |
| 226 | } |
| 227 | |
| 228 | /* |
| 229 | * Overrides for Emacs so that we follow Linus's tabbing style. |
| 230 | * Emacs will notice this stuff at the end of the file and automatically |
| 231 | * adjust the settings for this buffer only. This must remain at the end |
| 232 | * of the file. |
| 233 | * --------------------------------------------------------------------------- |
| 234 | * Local variables: |
| 235 | * c-file-style: "linux" |
| 236 | * End: |
| 237 | */ |