server/context_powerpc.c

   1 /*
   2  * PowerPC register context support
   3  *
   4  * Copyright (C) 2002 Marcus Meissner, SuSE Linux AG.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22
  23 #ifdef __powerpc__
  24
  25 #include <assert.h>
  26 #include <errno.h>
  27 #include <sys/types.h>
  28 #ifdef HAVE_SYS_REG_H
  29 # include <sys/reg.h>
  30 #endif
  31 #include <unistd.h>
  32 #ifdef HAVE_SYS_PTRACE_H
  33 # include <sys/ptrace.h>
  34 #endif
  35
  36 #include "winbase.h"
  37
  38 #include "file.h"
  39 #include "thread.h"
  40 #include "request.h"
  41
  42 /* retrieve a thread context */
  43 static void get_thread_context( struct thread *thread, unsigned int flags, CONTEXT *context )
  44 {
  45     int pid = thread->unix_pid;
  46     if (flags & CONTEXT_FULL)
  47     {
  48         if (flags & CONTEXT_INTEGER)
  49         {
  50 #define XREG(x,y) if (ptrace( PTRACE_PEEKUSER, pid, (void*)(x<<2), &context->y) == -1) goto error;
  51 #define IREG(x) if (ptrace( PTRACE_PEEKUSER, pid, (void*)(x<<2), &context->Gpr##x) == -1) goto error;
  52             IREG(0); IREG(1); IREG(2); IREG(3); IREG(4); IREG(5); IREG(6);
  53             IREG(7); IREG(8); IREG(9); IREG(10); IREG(11); IREG(12); IREG(13);
  54             IREG(14); IREG(15); IREG(16); IREG(17); IREG(18); IREG(19);
  55             IREG(20); IREG(21); IREG(22); IREG(23); IREG(24); IREG(25);
  56             IREG(26); IREG(27); IREG(28); IREG(29); IREG(30); IREG(31);
  57 #undef IREG
  58             XREG(37,Xer);
  59             XREG(38,Cr);
  60         }
  61         if (flags & CONTEXT_CONTROL)
  62         {
  63             XREG(32,Iar);
  64             XREG(33,Msr);
  65             XREG(35,Ctr);
  66             XREG(36,Lr); /* 36 is LNK ... probably Lr ? */
  67         }
  68     }
  69     if (flags & CONTEXT_FLOATING_POINT)
  70     {
  71 #define FREG(x) if (ptrace( PTRACE_PEEKUSER, pid, (void*)((48+x*2)<<2), &context->Fpr##x) == -1) goto error;
  72         FREG(0);
  73         FREG(1);
  74         FREG(2);
  75         FREG(3);
  76         FREG(4);
  77         FREG(5);
  78         FREG(6);
  79         FREG(7);
  80         FREG(8);
  81         FREG(9);
  82         FREG(10);
  83         FREG(11);
  84         FREG(12);
  85         FREG(13);
  86         FREG(14);
  87         FREG(15);
  88         FREG(16);
  89         FREG(17);
  90         FREG(18);
  91         FREG(19);
  92         FREG(20);
  93         FREG(21);
  94         FREG(22);
  95         FREG(23);
  96         FREG(24);
  97         FREG(25);
  98         FREG(26);
  99         FREG(27);
 100         FREG(28);
 101         FREG(29);
 102         FREG(30);
 103         FREG(31);
 104         XREG((48+32*2),Fpscr);
 105     }
 106     return;
 107  error:
 108     file_set_error();
 109 }
 110 #undef XREG
 111 #undef IREG
 112 #undef FREG
 113
 114 #define XREG(x,y) if (ptrace( PTRACE_POKEUSER, pid, (void*)(x<<2), &context->y) == -1) goto error;
 115 #define IREG(x) if (ptrace( PTRACE_POKEUSER, pid, (void*)(x<<2), &context->Gpr##x) == -1) goto error;
 116 #define FREG(x) if (ptrace( PTRACE_POKEUSER, pid, (void*)((48+x*2)<<2), &context->Fpr##x) == -1) goto error;
 117 /* set a thread context */
 118 static void set_thread_context( struct thread *thread, unsigned int flags, const CONTEXT *context )
 119 {
 120     int pid = thread->unix_pid;
 121     if (flags & CONTEXT_FULL)
 122     {
 123         if (flags & CONTEXT_INTEGER)
 124         {
 125             IREG(0); IREG(1); IREG(2); IREG(3); IREG(4); IREG(5); IREG(6);
 126             IREG(7); IREG(8); IREG(9); IREG(10); IREG(11); IREG(12); IREG(13);
 127             IREG(14); IREG(15); IREG(16); IREG(17); IREG(18); IREG(19);
 128             IREG(20); IREG(21); IREG(22); IREG(23); IREG(24); IREG(25);
 129             IREG(26); IREG(27); IREG(28); IREG(29); IREG(30); IREG(31);
 130             XREG(37,Xer);
 131             XREG(38,Cr);
 132
 133         }
 134         if (flags & CONTEXT_CONTROL)
 135         {
 136             XREG(32,Iar);
 137             XREG(33,Msr);
 138             XREG(35,Ctr);
 139             XREG(36,Lr);
 140         }
 141     }
 142     if (flags & CONTEXT_FLOATING_POINT)
 143     {
 144         FREG(0);
 145         FREG(1);
 146         FREG(2);
 147         FREG(3);
 148         FREG(4);
 149         FREG(5);
 150         FREG(6);
 151         FREG(7);
 152         FREG(8);
 153         FREG(9);
 154         FREG(10);
 155         FREG(11);
 156         FREG(12);
 157         FREG(13);
 158         FREG(14);
 159         FREG(15);
 160         FREG(16);
 161         FREG(17);
 162         FREG(18);
 163         FREG(19);
 164         FREG(20);
 165         FREG(21);
 166         FREG(22);
 167         FREG(23);
 168         FREG(24);
 169         FREG(25);
 170         FREG(26);
 171         FREG(27);
 172         FREG(28);
 173         FREG(29);
 174         FREG(30);
 175         FREG(31);
 176 #undef FREG
 177         XREG((48+32*2),Fpscr);
 178     }
 179     return;
 180  error:
 181     file_set_error();
 182 }
 183 #undef XREG
 184 #undef IREG
 185 #undef FREG
 186
 187 #define IREG(x) to->Gpr##x = from->Gpr##x;
 188 #define FREG(x) to->Fpr##x = from->Fpr##x;
 189 #define CREG(x) to->x = from->x;
 190 /* copy a context structure according to the flags */
 191 static void copy_context( CONTEXT *to, const CONTEXT *from, int flags )
 192 {
 193     if (flags & CONTEXT_CONTROL)
 194     {
 195         CREG(Msr);
 196         CREG(Ctr);
 197         CREG(Iar);
 198     }
 199     if (flags & CONTEXT_INTEGER)
 200     {
 201         IREG(0); IREG(1); IREG(2); IREG(3); IREG(4); IREG(5); IREG(6);
 202         IREG(7); IREG(8); IREG(9); IREG(10); IREG(11); IREG(12); IREG(13);
 203         IREG(14); IREG(15); IREG(16); IREG(17); IREG(18); IREG(19);
 204         IREG(20); IREG(21); IREG(22); IREG(23); IREG(24); IREG(25);
 205         IREG(26); IREG(27); IREG(28); IREG(29); IREG(30); IREG(31);
 206         CREG(Xer);
 207         CREG(Cr);
 208     }
 209     if (flags & CONTEXT_FLOATING_POINT)
 210     {
 211         FREG(0);
 212         FREG(1);
 213         FREG(2);
 214         FREG(3);
 215         FREG(4);
 216         FREG(5);
 217         FREG(6);
 218         FREG(7);
 219         FREG(8);
 220         FREG(9);
 221         FREG(10);
 222         FREG(11);
 223         FREG(12);
 224         FREG(13);
 225         FREG(14);
 226         FREG(15);
 227         FREG(16);
 228         FREG(17);
 229         FREG(18);
 230         FREG(19);
 231         FREG(20);
 232         FREG(21);
 233         FREG(22);
 234         FREG(23);
 235         FREG(24);
 236         FREG(25);
 237         FREG(26);
 238         FREG(27);
 239         FREG(28);
 240         FREG(29);
 241         FREG(30);
 242         FREG(31);
 243         CREG(Fpscr);
 244     }
 245 }
 246
 247 /* retrieve the current instruction pointer of a thread */
 248 void *get_thread_ip( struct thread *thread )
 249 {
 250     CONTEXT context;
 251     context.Iar = 0;
 252     if (suspend_for_ptrace( thread ))
 253     {
 254         get_thread_context( thread, CONTEXT_CONTROL, &context );
 255         resume_thread( thread );
 256     }
 257     return (void *)context.Iar;
 258 }
 259
 260 /* determine if we should continue the thread in single-step mode */
 261 int get_thread_single_step( struct thread *thread )
 262 {
 263     CONTEXT context;
 264     if (thread->context) return 0;
 265     get_thread_context( thread, CONTEXT_CONTROL, &context );
 266 #ifndef MSR_SE
 267 # define MSR_SE (1<<10)
 268 #endif
 269     return (context.Msr & MSR_SE) != 0;
 270 }
 271
 272 /* retrieve the current context of a thread */
 273 DECL_HANDLER(get_thread_context)
 274 {
 275     struct thread *thread;
 276     void *data;
 277     int flags = req->flags;
 278
 279     if (get_reply_max_size() < sizeof(CONTEXT))
 280     {
 281         set_error( STATUS_INVALID_PARAMETER );
 282         return;
 283     }
 284     if (!(thread = get_thread_from_handle( req->handle, THREAD_GET_CONTEXT ))) return;
 285
 286     if ((data = set_reply_data_size( sizeof(CONTEXT) )))
 287     {
 288         if (thread->context)  /* thread is inside an exception event */
 289         {
 290             copy_context( data, thread->context, flags );
 291             flags = 0;
 292         }
 293         if (flags && suspend_for_ptrace( thread ))
 294         {
 295             get_thread_context( thread, flags, data );
 296             resume_thread( thread );
 297         }
 298     }
 299     release_object( thread );
 300 }
 301
 302
 303 /* set the current context of a thread */
 304 DECL_HANDLER(set_thread_context)
 305 {
 306     struct thread *thread;
 307     int flags = req->flags;
 308
 309     if (get_req_data_size() < sizeof(CONTEXT))
 310     {
 311         set_error( STATUS_INVALID_PARAMETER );
 312         return;
 313     }
 314     if ((thread = get_thread_from_handle( req->handle, THREAD_SET_CONTEXT )))
 315     {
 316         if (thread->context)  /* thread is inside an exception event */
 317         {
 318             copy_context( thread->context, get_req_data(), flags );
 319             flags = 0;
 320         }
 321         if (flags && suspend_for_ptrace( thread ))
 322         {
 323             set_thread_context( thread, flags, get_req_data() );
 324             resume_thread( thread );
 325         }
 326         release_object( thread );
 327     }
 328 }
 329
 330 #endif  /* __powerpc__ */