arch/um/kernel/tt/ptproxy/ptrace.c

   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 #include "os.h"
  24
  25 long proxy_ptrace(struct debugger *debugger, int arg1, pid_t arg2,
  26                   long arg3, long arg4, pid_t child, int *ret)
  27 {
  28         sigset_t relay;
  29         long result;
  30         int status;
  31
  32         *ret = 0;
  33         if(debugger->debugee->died) return(-ESRCH);
  34
  35         switch(arg1){
  36         case PTRACE_ATTACH:
  37                 if(debugger->debugee->traced) return(-EPERM);
  38
  39                 debugger->debugee->pid = arg2;
  40                 debugger->debugee->traced = 1;
  41
  42                 if(is_valid_pid(arg2) && (arg2 != child)){
  43                         debugger->debugee->in_context = 0;
  44                         kill(arg2, SIGSTOP);
  45                         debugger->debugee->event = 1;
  46                         debugger->debugee->wait_status = W_STOPCODE(SIGSTOP);
  47                 }
  48                 else {
  49                         debugger->debugee->in_context = 1;
  50                         if(debugger->debugee->stopped)
  51                                 child_proxy(child, W_STOPCODE(SIGSTOP));
  52                         else kill(child, SIGSTOP);
  53                 }
  54
  55                 return(0);
  56
  57         case PTRACE_DETACH:
  58                 if(!debugger->debugee->traced) return(-EPERM);
  59
  60                 debugger->debugee->traced = 0;
  61                 debugger->debugee->pid = 0;
  62                 if(!debugger->debugee->in_context)
  63                         kill(child, SIGCONT);
  64
  65                 return(0);
  66
  67         case PTRACE_CONT:
  68                 if(!debugger->debugee->in_context) return(-EPERM);
  69                 *ret = PTRACE_CONT;
  70                 return(ptrace(PTRACE_CONT, child, arg3, arg4));
  71
  72 #ifdef UM_HAVE_GETFPREGS
  73         case PTRACE_GETFPREGS:
  74         {
  75                 long regs[FP_FRAME_SIZE];
  76                 int i, result;
  77
  78                 result = ptrace(PTRACE_GETFPREGS, child, 0, regs);
  79                 if(result == -1) return(-errno);
  80
  81                 for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++)
  82                         ptrace(PTRACE_POKEDATA, debugger->pid, arg4 + 4 * i,
  83                                regs[i]);
  84                 return(result);
  85         }
  86 #endif
  87
  88 #ifdef UM_HAVE_GETFPXREGS
  89         case PTRACE_GETFPXREGS:
  90         {
  91                 long regs[FPX_FRAME_SIZE];
  92                 int i, result;
  93
  94                 result = ptrace(PTRACE_GETFPXREGS, child, 0, regs);
  95                 if(result == -1) return(-errno);
  96
  97                 for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++)
  98                         ptrace(PTRACE_POKEDATA, debugger->pid, arg4 + 4 * i,
  99                                regs[i]);
 100                 return(result);
 101         }
 102 #endif
 103
 104 #ifdef UM_HAVE_GETREGS
 105         case PTRACE_GETREGS:
 106         {
 107                 long regs[FRAME_SIZE];
 108                 int i, result;
 109
 110                 result = ptrace(PTRACE_GETREGS, child, 0, regs);
 111                 if(result == -1) return(-errno);
 112
 113                 for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++)
 114                         ptrace (PTRACE_POKEDATA, debugger->pid,
 115                                 arg4 + 4 * i, regs[i]);
 116                 return(result);
 117         }
 118         break;
 119 #endif
 120
 121         case PTRACE_KILL:
 122                 result = ptrace(PTRACE_KILL, child, arg3, arg4);
 123                 if(result == -1) return(-errno);
 124
 125                 return(result);
 126
 127         case PTRACE_PEEKDATA:
 128         case PTRACE_PEEKTEXT:
 129         case PTRACE_PEEKUSR:
 130                 /* The value being read out could be -1, so we have to
 131                  * check errno to see if there's an error, and zero it
 132                  * beforehand so we're not faked out by an old error
 133                  */
 134
 135                 errno = 0;
 136                 result = ptrace(arg1, child, arg3, 0);
 137                 if((result == -1) && (errno != 0)) return(-errno);
 138
 139                 result = ptrace(PTRACE_POKEDATA, debugger->pid, arg4, result);
 140                 if(result == -1) return(-errno);
 141
 142                 return(result);
 143
 144         case PTRACE_POKEDATA:
 145         case PTRACE_POKETEXT:
 146         case PTRACE_POKEUSR:
 147                 result = ptrace(arg1, child, arg3, arg4);
 148                 if(result == -1) return(-errno);
 149
 150                 if(arg1 == PTRACE_POKEUSR) ptrace_pokeuser(arg3, arg4);
 151                 return(result);
 152
 153 #ifdef UM_HAVE_SETFPREGS
 154         case PTRACE_SETFPREGS:
 155         {
 156                 long regs[FP_FRAME_SIZE];
 157                 int i;
 158
 159                 for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++)
 160                         regs[i] = ptrace (PTRACE_PEEKDATA, debugger->pid,
 161                                           arg4 + 4 * i, 0);
 162                 result = ptrace(PTRACE_SETFPREGS, child, 0, regs);
 163                 if(result == -1) return(-errno);
 164
 165                 return(result);
 166         }
 167 #endif
 168
 169 #ifdef UM_HAVE_SETFPXREGS
 170         case PTRACE_SETFPXREGS:
 171         {
 172                 long regs[FPX_FRAME_SIZE];
 173                 int i;
 174
 175                 for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++)
 176                         regs[i] = ptrace (PTRACE_PEEKDATA, debugger->pid,
 177                                           arg4 + 4 * i, 0);
 178                 result = ptrace(PTRACE_SETFPXREGS, child, 0, regs);
 179                 if(result == -1) return(-errno);
 180
 181                 return(result);
 182         }
 183 #endif
 184
 185 #ifdef UM_HAVE_SETREGS
 186         case PTRACE_SETREGS:
 187         {
 188                 long regs[FRAME_SIZE];
 189                 int i;
 190
 191                 for (i = 0; i < sizeof(regs)/sizeof(regs[0]); i++)
 192                         regs[i] = ptrace(PTRACE_PEEKDATA, debugger->pid,
 193                                          arg4 + 4 * i, 0);
 194                 result = ptrace(PTRACE_SETREGS, child, 0, regs);
 195                 if(result == -1) return(-errno);
 196
 197                 return(result);
 198         }
 199 #endif
 200
 201         case PTRACE_SINGLESTEP:
 202                 if(!debugger->debugee->in_context) return(-EPERM);
 203                 sigemptyset(&relay);
 204                 sigaddset(&relay, SIGSEGV);
 205                 sigaddset(&relay, SIGILL);
 206                 sigaddset(&relay, SIGBUS);
 207                 result = ptrace(PTRACE_SINGLESTEP, child, arg3, arg4);
 208                 if(result == -1) return(-errno);
 209
 210                 status = wait_for_stop(child, SIGTRAP, PTRACE_SINGLESTEP,
 211                                        &relay);
 212                 child_proxy(child, status);
 213                 return(result);
 214
 215         case PTRACE_SYSCALL:
 216                 if(!debugger->debugee->in_context) return(-EPERM);
 217                 result = ptrace(PTRACE_SYSCALL, child, arg3, arg4);
 218                 if(result == -1) return(-errno);
 219
 220                 *ret = PTRACE_SYSCALL;
 221                 return(result);
 222
 223         case PTRACE_TRACEME:
 224         default:
 225                 return(-EINVAL);
 226         }
 227 }
 228
 229 /*
 230  * Overrides for Emacs so that we follow Linus's tabbing style.
 231  * Emacs will notice this stuff at the end of the file and automatically
 232  * adjust the settings for this buffer only.  This must remain at the end
 233  * of the file.
 234  * ---------------------------------------------------------------------------
 235  * Local variables:
 236  * c-file-style: "linux"
 237  * End:
 238  */