gdb/hppa-linux-nat.c

   1 /* Functions specific to running GDB native on HPPA running GNU/Linux.
   2
   3    Copyright 2004 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include "defs.h"
  23 #include "gdbcore.h"
  24 #include "regcache.h"
  25 #include "gdb_string.h"
  26 #include "inferior.h"
  27
  28 #include <sys/procfs.h>
  29 #include <sys/ptrace.h>
  30 #include <linux/version.h>
  31
  32 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,43)
  33 #include <asm/offset.h>
  34 #else
  35 #include <asm/offsets.h>
  36 #endif
  37
  38 #include "hppa-tdep.h"
  39
  40 /* Prototypes for supply_gregset etc. */
  41 #include "gregset.h"
  42
  43 /* These must match the order of the register names.
  44
  45    Some sort of lookup table is needed because the offsets associated
  46    with the registers are all over the board.  */
  47
  48 static const int u_offsets[] =
  49   {
  50     /* general registers */
  51     -1,
  52     PT_GR1,
  53     PT_GR2,
  54     PT_GR3,
  55     PT_GR4,
  56     PT_GR5,
  57     PT_GR6,
  58     PT_GR7,
  59     PT_GR8,
  60     PT_GR9,
  61     PT_GR10,
  62     PT_GR11,
  63     PT_GR12,
  64     PT_GR13,
  65     PT_GR14,
  66     PT_GR15,
  67     PT_GR16,
  68     PT_GR17,
  69     PT_GR18,
  70     PT_GR19,
  71     PT_GR20,
  72     PT_GR21,
  73     PT_GR22,
  74     PT_GR23,
  75     PT_GR24,
  76     PT_GR25,
  77     PT_GR26,
  78     PT_GR27,
  79     PT_GR28,
  80     PT_GR29,
  81     PT_GR30,
  82     PT_GR31,
  83
  84     PT_SAR,
  85     PT_IAOQ0,
  86     PT_IASQ0,
  87     PT_IAOQ1,
  88     PT_IASQ1,
  89     -1, /* eiem */
  90     PT_IIR,
  91     PT_ISR,
  92     PT_IOR,
  93     PT_PSW,
  94     -1, /* goto */
  95
  96     PT_SR4,
  97     PT_SR0,
  98     PT_SR1,
  99     PT_SR2,
 100     PT_SR3,
 101     PT_SR5,
 102     PT_SR6,
 103     PT_SR7,
 104
 105     -1, /* cr0 */
 106     -1, /* pid0 */
 107     -1, /* pid1 */
 108     -1, /* ccr */
 109     -1, /* pid2 */
 110     -1, /* pid3 */
 111     -1, /* cr24 */
 112     -1, /* cr25 */
 113     -1, /* cr26 */
 114     PT_CR27,
 115     -1, /* cr28 */
 116     -1, /* cr29 */
 117     -1, /* cr30 */
 118
 119     /* Floating point regs.  */
 120     PT_FR0,  PT_FR0 + 4,
 121     PT_FR1,  PT_FR1 + 4,
 122     PT_FR2,  PT_FR2 + 4,
 123     PT_FR3,  PT_FR3 + 4,
 124     PT_FR4,  PT_FR4 + 4,
 125     PT_FR5,  PT_FR5 + 4,
 126     PT_FR6,  PT_FR6 + 4,
 127     PT_FR7,  PT_FR7 + 4,
 128     PT_FR8,  PT_FR8 + 4,
 129     PT_FR9,  PT_FR9 + 4,
 130     PT_FR10, PT_FR10 + 4,
 131     PT_FR11, PT_FR11 + 4,
 132     PT_FR12, PT_FR12 + 4,
 133     PT_FR13, PT_FR13 + 4,
 134     PT_FR14, PT_FR14 + 4,
 135     PT_FR15, PT_FR15 + 4,
 136     PT_FR16, PT_FR16 + 4,
 137     PT_FR17, PT_FR17 + 4,
 138     PT_FR18, PT_FR18 + 4,
 139     PT_FR19, PT_FR19 + 4,
 140     PT_FR20, PT_FR20 + 4,
 141     PT_FR21, PT_FR21 + 4,
 142     PT_FR22, PT_FR22 + 4,
 143     PT_FR23, PT_FR23 + 4,
 144     PT_FR24, PT_FR24 + 4,
 145     PT_FR25, PT_FR25 + 4,
 146     PT_FR26, PT_FR26 + 4,
 147     PT_FR27, PT_FR27 + 4,
 148     PT_FR28, PT_FR28 + 4,
 149     PT_FR29, PT_FR29 + 4,
 150     PT_FR30, PT_FR30 + 4,
 151     PT_FR31, PT_FR31 + 4,
 152   };
 153
 154 CORE_ADDR
 155 register_addr (int regno, CORE_ADDR blockend)
 156 {
 157   CORE_ADDR addr;
 158
 159   if ((unsigned) regno >= NUM_REGS)
 160     error ("Invalid register number %d.", regno);
 161
 162   if (u_offsets[regno] == -1)
 163     addr = 0;
 164   else
 165     {
 166       addr = (CORE_ADDR) u_offsets[regno];
 167     }
 168
 169   return addr;
 170 }
 171
 172 /*
 173  * Registers saved in a coredump:
 174  * gr0..gr31
 175  * sr0..sr7
 176  * iaoq0..iaoq1
 177  * iasq0..iasq1
 178  * sar, iir, isr, ior, ipsw
 179  * cr0, cr24..cr31
 180  * cr8,9,12,13
 181  * cr10, cr15
 182  */
 183 #define GR_REGNUM(_n)   (HPPA_R0_REGNUM+_n)
 184 #define TR_REGNUM(_n)   (HPPA_TR0_REGNUM+_n)
 185 static const int greg_map[] =
 186   {
 187     GR_REGNUM(0), GR_REGNUM(1), GR_REGNUM(2), GR_REGNUM(3),
 188     GR_REGNUM(4), GR_REGNUM(5), GR_REGNUM(6), GR_REGNUM(7),
 189     GR_REGNUM(8), GR_REGNUM(9), GR_REGNUM(10), GR_REGNUM(11),
 190     GR_REGNUM(12), GR_REGNUM(13), GR_REGNUM(14), GR_REGNUM(15),
 191     GR_REGNUM(16), GR_REGNUM(17), GR_REGNUM(18), GR_REGNUM(19),
 192     GR_REGNUM(20), GR_REGNUM(21), GR_REGNUM(22), GR_REGNUM(23),
 193     GR_REGNUM(24), GR_REGNUM(25), GR_REGNUM(26), GR_REGNUM(27),
 194     GR_REGNUM(28), GR_REGNUM(29), GR_REGNUM(30), GR_REGNUM(31),
 195
 196     HPPA_SR4_REGNUM+1, HPPA_SR4_REGNUM+2, HPPA_SR4_REGNUM+3, HPPA_SR4_REGNUM+4,
 197     HPPA_SR4_REGNUM, HPPA_SR4_REGNUM+5, HPPA_SR4_REGNUM+6, HPPA_SR4_REGNUM+7,
 198
 199     HPPA_PCOQ_HEAD_REGNUM, HPPA_PCOQ_TAIL_REGNUM,
 200     HPPA_PCSQ_HEAD_REGNUM, HPPA_PCSQ_TAIL_REGNUM,
 201
 202     HPPA_SAR_REGNUM, HPPA_IIR_REGNUM, HPPA_ISR_REGNUM, HPPA_IOR_REGNUM,
 203     HPPA_IPSW_REGNUM, HPPA_RCR_REGNUM,
 204
 205     TR_REGNUM(0), TR_REGNUM(1), TR_REGNUM(2), TR_REGNUM(3),
 206     TR_REGNUM(4), TR_REGNUM(5), TR_REGNUM(6), TR_REGNUM(7),
 207
 208     HPPA_PID0_REGNUM, HPPA_PID1_REGNUM, HPPA_PID2_REGNUM, HPPA_PID3_REGNUM,
 209     HPPA_CCR_REGNUM, HPPA_EIEM_REGNUM,
 210   };
 211
 212
 213
 214 /* Fetch one register.  */
 215
 216 static void
 217 fetch_register (int regno)
 218 {
 219   int tid;
 220   int val;
 221
 222   if (CANNOT_FETCH_REGISTER (regno))
 223     {
 224       supply_register (regno, NULL);
 225       return;
 226     }
 227
 228   /* GNU/Linux LWP ID's are process ID's.  */
 229   tid = TIDGET (inferior_ptid);
 230   if (tid == 0)
 231     tid = PIDGET (inferior_ptid); /* Not a threaded program.  */
 232
 233   errno = 0;
 234   val = ptrace (PTRACE_PEEKUSER, tid, register_addr (regno, 0), 0);
 235   if (errno != 0)
 236     error ("Couldn't read register %s (#%d): %s.", REGISTER_NAME (regno),
 237            regno, safe_strerror (errno));
 238
 239   regcache_raw_supply (current_regcache, regno, &val);
 240 }
 241
 242 /* Store one register. */
 243
 244 static void
 245 store_register (int regno)
 246 {
 247   int tid;
 248   int val;
 249
 250   if (CANNOT_STORE_REGISTER (regno))
 251     return;
 252
 253   /* GNU/Linux LWP ID's are process ID's.  */
 254   tid = TIDGET (inferior_ptid);
 255   if (tid == 0)
 256     tid = PIDGET (inferior_ptid); /* Not a threaded program.  */
 257
 258   errno = 0;
 259   regcache_raw_collect (current_regcache, regno, &val);
 260   ptrace (PTRACE_POKEUSER, tid, register_addr (regno, 0), val);
 261   if (errno != 0)
 262     error ("Couldn't write register %s (#%d): %s.", REGISTER_NAME (regno),
 263            regno, safe_strerror (errno));
 264 }
 265
 266 /* Fetch registers from the child process.  Fetch all registers if
 267    regno == -1, otherwise fetch all general registers or all floating
 268    point registers depending upon the value of regno.  */
 269
 270 void
 271 fetch_inferior_registers (int regno)
 272 {
 273   if (-1 == regno)
 274     {
 275       for (regno = 0; regno < NUM_REGS; regno++)
 276         fetch_register (regno);
 277     }
 278   else
 279     {
 280       fetch_register (regno);
 281     }
 282 }
 283
 284 /* Store registers back into the inferior.  Store all registers if
 285    regno == -1, otherwise store all general registers or all floating
 286    point registers depending upon the value of regno.  */
 287
 288 void
 289 store_inferior_registers (int regno)
 290 {
 291   if (-1 == regno)
 292     {
 293       for (regno = 0; regno < NUM_REGS; regno++)
 294         store_register (regno);
 295     }
 296   else
 297     {
 298       store_register (regno);
 299     }
 300 }
 301
 302 /* Fill GDB's register array with the general-purpose register values
 303    in *gregsetp.  */
 304
 305 void
 306 supply_gregset (gdb_gregset_t *gregsetp)
 307 {
 308   int i;
 309   greg_t *regp = (elf_greg_t *) gregsetp;
 310
 311   for (i = 0; i < sizeof (greg_map) / sizeof (greg_map[0]); i++, regp++)
 312     {
 313       int regno = greg_map[i];
 314       supply_register (regno, regp);
 315     }
 316 }
 317
 318 /* Fill register regno (if it is a general-purpose register) in
 319    *gregsetp with the appropriate value from GDB's register array.
 320    If regno is -1, do this for all registers.  */
 321
 322 void
 323 fill_gregset (gdb_gregset_t *gregsetp, int regno)
 324 {
 325   int i;
 326
 327   for (i = 0; i < sizeof (greg_map) / sizeof (greg_map[0]); i++)
 328     {
 329       int mregno = greg_map[i];
 330
 331       if (regno == -1 || regno == mregno)
 332         {
 333           regcache_collect(mregno, &(*gregsetp)[i]);
 334         }
 335     }
 336 }
 337
 338 /*  Given a pointer to a floating point register set in /proc format
 339    (fpregset_t *), unpack the register contents and supply them as gdb's
 340    idea of the current floating point register values. */
 341
 342 void
 343 supply_fpregset (gdb_fpregset_t *fpregsetp)
 344 {
 345   int regi;
 346   char *from;
 347
 348   for (regi = 0; regi <= 31; regi++)
 349     {
 350       from = (char *) &((*fpregsetp)[regi]);
 351       supply_register (2*regi + HPPA_FP0_REGNUM, from);
 352       supply_register (2*regi + HPPA_FP0_REGNUM + 1, from + 4);
 353     }
 354 }
 355
 356 /*  Given a pointer to a floating point register set in /proc format
 357    (fpregset_t *), update the register specified by REGNO from gdb's idea
 358    of the current floating point register set.  If REGNO is -1, update
 359    them all. */
 360
 361 void
 362 fill_fpregset (gdb_fpregset_t *fpregsetp, int regno)
 363 {
 364   int i;
 365
 366   for (i = HPPA_FP0_REGNUM; i < HPPA_FP0_REGNUM + 32 * 2; i++)
 367    {
 368       /* Gross.  fpregset_t is double, registers[x] has single
 369          precision reg.  */
 370       char *to = (char *) &((*fpregsetp)[(i - HPPA_FP0_REGNUM) / 2]);
 371       if ((i - HPPA_FP0_REGNUM) & 1)
 372         to += 4;
 373       regcache_collect (i, to);
 374    }
 375 }