server/context_alpha.c

   1 /*
   2  * Alpha register context support
   3  *
   4  * Copyright (C) 2004 Vincent Béron
   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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22
  23 #ifdef __ALPHA__
  24
  25 #include <assert.h>
  26 #include <errno.h>
  27 #ifdef HAVE_SYS_REG_H
  28 # include <sys/reg.h>
  29 #endif
  30 #include <stdarg.h>
  31 #include <unistd.h>
  32 #ifdef HAVE_SYS_PTRACE_H
  33 # include <sys/ptrace.h>
  34 #endif
  35
  36 #include "file.h"
  37 #include "thread.h"
  38 #include "request.h"
  39
  40 #if 0  /* no longer used */
  41
  42 #ifdef HAVE_SYS_USER_H
  43 # include <sys/user.h>
  44 #endif
  45
  46 /* user definitions from asm/user.h */
  47 struct kernel_user_struct
  48 {
  49     unsigned long regs[EF_SIZE/8+32];
  50     size_t u_tsize;
  51     size_t u_dsize;
  52     size_t u_ssize;
  53     unsigned long start_code;
  54     unsigned long start_data;
  55     unsigned long start_stack;
  56     long int signal;
  57     struct regs * u_ar0;
  58     unsigned long magic;
  59     char u_comm[32];
  60 };
  61
  62 /* get thread context */
  63 static void get_thread_context( struct thread *thread, unsigned int flags, CONTEXT *context )
  64 {
  65     int pid = get_ptrace_pid(thread);
  66     if (flags & CONTEXT_FULL)
  67     {
  68         struct kernel_user_struct regs;
  69         if (ptrace( PTRACE_GETREGS, pid, 0, &regs ) == -1) goto error;
  70         if (flags & CONTEXT_INTEGER)
  71         {
  72             context->IntV0 = regs.regs[EF_V0];
  73             context->IntT0 = regs.regs[EF_T0];
  74             context->IntT1 = regs.regs[EF_T1];
  75             context->IntT2 = regs.regs[EF_T2];
  76             context->IntT3 = regs.regs[EF_T3];
  77             context->IntT4 = regs.regs[EF_T4];
  78             context->IntT5 = regs.regs[EF_T5];
  79             context->IntT6 = regs.regs[EF_T6];
  80             context->IntT7 = regs.regs[EF_T7];
  81             context->IntS0 = regs.regs[EF_S0];
  82             context->IntS1 = regs.regs[EF_S1];
  83             context->IntS2 = regs.regs[EF_S2];
  84             context->IntS3 = regs.regs[EF_S3];
  85             context->IntS4 = regs.regs[EF_S4];
  86             context->IntS5 = regs.regs[EF_S5];
  87             context->IntFp = regs.regs[EF_S6];
  88             context->IntA0 = regs.regs[EF_A0];
  89             context->IntA1 = regs.regs[EF_A1];
  90             context->IntA2 = regs.regs[EF_A2];
  91             context->IntA3 = regs.regs[EF_A3];
  92             context->IntA4 = regs.regs[EF_A4];
  93             context->IntA5 = regs.regs[EF_A5];
  94             context->IntT8 = regs.regs[EF_T8];
  95             context->IntT9 = regs.regs[EF_T9];
  96             context->IntT10 = regs.regs[EF_T10];
  97             context->IntT11 = regs.regs[EF_T11];
  98             context->IntT12 = regs.regs[EF_T12];
  99             context->IntAt = regs.regs[EF_AT];
 100             context->IntZero = 0;
 101         }
 102         if (flags & CONTEXT_CONTROL)
 103         {
 104             context->IntRa = regs.regs[EF_RA];
 105             context->IntGp = regs.regs[EF_GP];
 106             context->IntSp = regs.regs[EF_SP];
 107             context->Fir = regs.regs[EF_PC];
 108             context->Psr = regs.regs[EF_PS];
 109         }
 110         if (flags & CONTEXT_FLOATING_POINT)
 111         {
 112             context->FltF0 = regs.regs[EF_SIZE/8+0];
 113             context->FltF1 = regs.regs[EF_SIZE/8+1];
 114             context->FltF2 = regs.regs[EF_SIZE/8+2];
 115             context->FltF3 = regs.regs[EF_SIZE/8+3];
 116             context->FltF4 = regs.regs[EF_SIZE/8+4];
 117             context->FltF5 = regs.regs[EF_SIZE/8+5];
 118             context->FltF6 = regs.regs[EF_SIZE/8+6];
 119             context->FltF7 = regs.regs[EF_SIZE/8+7];
 120             context->FltF8 = regs.regs[EF_SIZE/8+8];
 121             context->FltF9 = regs.regs[EF_SIZE/8+9];
 122             context->FltF10 = regs.regs[EF_SIZE/8+10];
 123             context->FltF11 = regs.regs[EF_SIZE/8+11];
 124             context->FltF12 = regs.regs[EF_SIZE/8+12];
 125             context->FltF13 = regs.regs[EF_SIZE/8+13];
 126             context->FltF14 = regs.regs[EF_SIZE/8+14];
 127             context->FltF15 = regs.regs[EF_SIZE/8+15];
 128             context->FltF16 = regs.regs[EF_SIZE/8+16];
 129             context->FltF17 = regs.regs[EF_SIZE/8+17];
 130             context->FltF18 = regs.regs[EF_SIZE/8+18];
 131             context->FltF19 = regs.regs[EF_SIZE/8+19];
 132             context->FltF20 = regs.regs[EF_SIZE/8+20];
 133             context->FltF21 = regs.regs[EF_SIZE/8+21];
 134             context->FltF22 = regs.regs[EF_SIZE/8+22];
 135             context->FltF23 = regs.regs[EF_SIZE/8+23];
 136             context->FltF24 = regs.regs[EF_SIZE/8+24];
 137             context->FltF25 = regs.regs[EF_SIZE/8+25];
 138             context->FltF26 = regs.regs[EF_SIZE/8+26];
 139             context->FltF27 = regs.regs[EF_SIZE/8+27];
 140             context->FltF28 = regs.regs[EF_SIZE/8+28];
 141             context->FltF29 = regs.regs[EF_SIZE/8+29];
 142             context->FltF30 = regs.regs[EF_SIZE/8+30];
 143             context->FltF31 = 0;
 144             context->Fpcr = regs.regs[EF_SIZE/8+31];
 145             context->SoftFpcr = 0; /* FIXME */
 146         }
 147         context->ContextFlags |= flags & CONTEXT_FULL;
 148     }
 149     return;
 150  error:
 151     file_set_error();
 152 }
 153
 154 /* set a thread context */
 155 static void set_thread_context( struct thread *thread, unsigned int flags, const CONTEXT *context )
 156 {
 157     int pid = get_ptrace_pid(thread);
 158     if (flags & CONTEXT_FULL)
 159     {
 160         struct kernel_user_struct regs;
 161         if (ptrace( PTRACE_GETREGS, pid, 0, &regs ) == -1) goto error;
 162         if (flags & CONTEXT_INTEGER)
 163         {
 164             regs.regs[EF_V0] = context->IntV0;
 165             regs.regs[EF_T0] = context->IntT0;
 166             regs.regs[EF_T1] = context->IntT1;
 167             regs.regs[EF_T2] = context->IntT2;
 168             regs.regs[EF_T3] = context->IntT3;
 169             regs.regs[EF_T4] = context->IntT4;
 170             regs.regs[EF_T5] = context->IntT5;
 171             regs.regs[EF_T6] = context->IntT6;
 172             regs.regs[EF_T7] = context->IntT7;
 173             regs.regs[EF_S0] = context->IntS0;
 174             regs.regs[EF_S1] = context->IntS1;
 175             regs.regs[EF_S2] = context->IntS2;
 176             regs.regs[EF_S3] = context->IntS3;
 177             regs.regs[EF_S4] = context->IntS4;
 178             regs.regs[EF_S5] = context->IntS5;
 179             regs.regs[EF_S6] = context->IntFp;
 180             regs.regs[EF_A0] = context->IntA0;
 181             regs.regs[EF_A1] = context->IntA1;
 182             regs.regs[EF_A2] = context->IntA2;
 183             regs.regs[EF_A3] = context->IntA3;
 184             regs.regs[EF_A4] = context->IntA4;
 185             regs.regs[EF_A5] = context->IntA5;
 186             regs.regs[EF_T8] = context->IntT8;
 187             regs.regs[EF_T9] = context->IntT9;
 188             regs.regs[EF_T10] = context->IntT10;
 189             regs.regs[EF_T11] = context->IntT11;
 190             regs.regs[EF_T12] = context->IntT12;
 191             regs.regs[EF_AT] = context->IntAt;
 192         }
 193         if (flags & CONTEXT_CONTROL)
 194         {
 195             regs.regs[EF_RA] = context->IntRa;
 196             regs.regs[EF_GP] = context->IntGp;
 197             regs.regs[EF_SP] = context->IntSp;
 198             regs.regs[EF_PC] = context->Fir;
 199             regs.regs[EF_PS] = context->Psr;
 200         }
 201         if (flags & CONTEXT_FLOATING_POINT)
 202         {
 203             regs.regs[EF_SIZE/8+0] = context->FltF0;
 204             regs.regs[EF_SIZE/8+1] = context->FltF1;
 205             regs.regs[EF_SIZE/8+2] = context->FltF2;
 206             regs.regs[EF_SIZE/8+3] = context->FltF3;
 207             regs.regs[EF_SIZE/8+4] = context->FltF4;
 208             regs.regs[EF_SIZE/8+5] = context->FltF5;
 209             regs.regs[EF_SIZE/8+6] = context->FltF6;
 210             regs.regs[EF_SIZE/8+7] = context->FltF7;
 211             regs.regs[EF_SIZE/8+8] = context->FltF8;
 212             regs.regs[EF_SIZE/8+9] = context->FltF9;
 213             regs.regs[EF_SIZE/8+10] = context->FltF10;
 214             regs.regs[EF_SIZE/8+11] = context->FltF11;
 215             regs.regs[EF_SIZE/8+12] = context->FltF12;
 216             regs.regs[EF_SIZE/8+13] = context->FltF13;
 217             regs.regs[EF_SIZE/8+14] = context->FltF14;
 218             regs.regs[EF_SIZE/8+15] = context->FltF15;
 219             regs.regs[EF_SIZE/8+16] = context->FltF16;
 220             regs.regs[EF_SIZE/8+17] = context->FltF17;
 221             regs.regs[EF_SIZE/8+18] = context->FltF18;
 222             regs.regs[EF_SIZE/8+19] = context->FltF19;
 223             regs.regs[EF_SIZE/8+20] = context->FltF20;
 224             regs.regs[EF_SIZE/8+21] = context->FltF21;
 225             regs.regs[EF_SIZE/8+22] = context->FltF22;
 226             regs.regs[EF_SIZE/8+23] = context->FltF23;
 227             regs.regs[EF_SIZE/8+24] = context->FltF24;
 228             regs.regs[EF_SIZE/8+25] = context->FltF25;
 229             regs.regs[EF_SIZE/8+26] = context->FltF26;
 230             regs.regs[EF_SIZE/8+27] = context->FltF27;
 231             regs.regs[EF_SIZE/8+28] = context->FltF28;
 232             regs.regs[EF_SIZE/8+29] = context->FltF29;
 233             regs.regs[EF_SIZE/8+30] = context->FltF30;
 234             regs.regs[EF_SIZE/8+31] = context->Fpcr;
 235         }
 236         if (ptrace( PTRACE_SETREGS, pid, 0, &regs ) == -1) goto error;
 237     }
 238     return;
 239  error:
 240     file_set_error();
 241 }
 242
 243 #endif /* 0 */
 244
 245 /* copy a context structure according to the flags */
 246 void copy_context( CONTEXT *to, const CONTEXT *from, unsigned int flags )
 247 {
 248     flags &= ~CONTEXT_ALPHA;  /* get rid of CPU id */
 249     if (flags & CONTEXT_CONTROL)
 250     {
 251         to->IntRa = from->IntRa;
 252         to->IntGp = from->IntGp;
 253         to->IntSp = from->IntSp;
 254         to->Fir = from->Fir;
 255         to->Psr = from->Psr;
 256     }
 257     if (flags & CONTEXT_INTEGER)
 258     {
 259         to->IntV0 = from->IntV0;
 260         to->IntT0 = from->IntT0;
 261         to->IntT1 = from->IntT1;
 262         to->IntT2 = from->IntT2;
 263         to->IntT3 = from->IntT3;
 264         to->IntT4 = from->IntT4;
 265         to->IntT5 = from->IntT5;
 266         to->IntT6 = from->IntT6;
 267         to->IntT7 = from->IntT7;
 268         to->IntS0 = from->IntS0;
 269         to->IntS1 = from->IntS1;
 270         to->IntS2 = from->IntS2;
 271         to->IntS3 = from->IntS3;
 272         to->IntS4 = from->IntS4;
 273         to->IntS5 = from->IntS5;
 274         to->IntFp = from->IntFp;
 275         to->IntA0 = from->IntA0;
 276         to->IntA1 = from->IntA1;
 277         to->IntA2 = from->IntA2;
 278         to->IntA3 = from->IntA3;
 279         to->IntA4 = from->IntA4;
 280         to->IntA5 = from->IntA5;
 281         to->IntT8 = from->IntT8;
 282         to->IntT9 = from->IntT9;
 283         to->IntT10 = from->IntT10;
 284         to->IntT11 = from->IntT11;
 285         to->IntT12 = from->IntT12;
 286         to->IntAt = from->IntAt;
 287         to->IntZero = from->IntZero;
 288     }
 289     if (flags & CONTEXT_FLOATING_POINT)
 290     {
 291         to->FltF0 = from->FltF0;
 292         to->FltF1 = from->FltF1;
 293         to->FltF2 = from->FltF2;
 294         to->FltF3 = from->FltF3;
 295         to->FltF4 = from->FltF4;
 296         to->FltF5 = from->FltF5;
 297         to->FltF6 = from->FltF6;
 298         to->FltF7 = from->FltF7;
 299         to->FltF8 = from->FltF8;
 300         to->FltF9 = from->FltF9;
 301         to->FltF10 = from->FltF10;
 302         to->FltF11 = from->FltF11;
 303         to->FltF12 = from->FltF12;
 304         to->FltF13 = from->FltF13;
 305         to->FltF14 = from->FltF14;
 306         to->FltF15 = from->FltF15;
 307         to->FltF16 = from->FltF16;
 308         to->FltF17 = from->FltF17;
 309         to->FltF18 = from->FltF18;
 310         to->FltF19 = from->FltF19;
 311         to->FltF20 = from->FltF20;
 312         to->FltF21 = from->FltF21;
 313         to->FltF22 = from->FltF22;
 314         to->FltF23 = from->FltF23;
 315         to->FltF24 = from->FltF24;
 316         to->FltF25 = from->FltF25;
 317         to->FltF26 = from->FltF26;
 318         to->FltF27 = from->FltF27;
 319         to->FltF28 = from->FltF28;
 320         to->FltF29 = from->FltF29;
 321         to->FltF30 = from->FltF30;
 322         to->FltF31 = from->FltF31;
 323         to->Fpcr = from->Fpcr;
 324         to->SoftFpcr = from->SoftFpcr;
 325     }
 326     to->ContextFlags |= flags;
 327 }
 328
 329 /* retrieve the current instruction pointer of a context */
 330 void *get_context_ip( const CONTEXT *context )
 331 {
 332     return (void *)context->Fir;
 333 }
 334
 335 /* return the context flag that contains the CPU id */
 336 unsigned int get_context_cpu_flag(void)
 337 {
 338     return CONTEXT_ALPHA;
 339 }
 340
 341 /* return only the context flags that correspond to system regs */
 342 /* (system regs are the ones we can't access on the client side) */
 343 unsigned int get_context_system_regs( unsigned int flags )
 344 {
 345     return 0;  /* FIXME: implement client-side handling */
 346 }
 347
 348 #endif  /* __ALPHA__ */