gdb/hppanbsd-tdep.c

   1 /* Target-dependent code for NetBSD/hppa
   2
   3    Copyright (C) 2008 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., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 #include "defs.h"
  23 #include "osabi.h"
  24 #include "regcache.h"
  25 #include "regset.h"
  26
  27 #include "trad-frame.h"
  28 #include "tramp-frame.h"
  29
  30 #include "gdb_assert.h"
  31 #include "gdb_string.h"
  32
  33 #include "hppa-tdep.h"
  34
  35 /* From <machine/mcontext.h>.  */
  36 static int hppanbsd_mc_reg_offset[] =
  37 {
  38   /* r0 ... r31 */
  39       -1,   1 * 4,   2 * 4,   3 * 4,
  40    4 * 4,   5 * 4,   6 * 4,   7 * 4,
  41    8 * 4,   9 * 4,  10 * 4,  11 * 4,
  42   12 * 4,  13 * 4,  14 * 4,  15 * 4,
  43   16 * 4,  17 * 4,  18 * 4,  19 * 4,
  44   20 * 4,  21 * 4,  22 * 4,  23 * 4,
  45   24 * 4,  25 * 4,  26 * 4,  27 * 4,
  46   28 * 4,  29 * 4,  30 * 4,  31 * 4,
  47
  48   32 * 4,       /* HPPA_SAR_REGNUM */
  49   35 * 4,       /* HPPA_PCOQ_HEAD_REGNUM */
  50   33 * 4,       /* HPPA_PCSQ_HEAD_REGNUM */
  51   36 * 4,       /* HPPA_PCOQ_TAIL_REGNUM */
  52   34 * 4,       /* HPPA_PCSQ_TAIL_REGNUM */
  53   -1,           /* HPPA_EIEM_REGNUM */
  54   -1,           /* HPPA_IIR_REGNUM */
  55   -1,           /* HPPA_ISR_REGNUM */
  56   -1,           /* HPPA_IOR_REGNUM */
  57   0 * 4,        /* HPPA_IPSW_REGNUM */
  58   -1,           /* spare? */
  59   41 * 4,       /* HPPA_SR4_REGNUM */
  60   37 * 4,       /* sr0 */
  61   38 * 4,       /* sr1 */
  62   39 * 4,       /* sr2 */
  63   40 * 4,       /* sr3 */
  64
  65   /* more tbd */
  66 };
  67
  68 static void hppanbsd_sigtramp_cache_init (const struct tramp_frame *,
  69                                          struct frame_info *,
  70                                          struct trad_frame_cache *,
  71                                          CORE_ADDR);
  72
  73 static const struct tramp_frame hppanbsd_sigtramp_si4 =
  74 {
  75   SIGTRAMP_FRAME,
  76   4,
  77   {
  78     { 0xc7d7c012, -1 }, /*      bb,>=,n %arg3, 30, 1f           */
  79     { 0xd6e01c1e, -1 }, /*       depwi 0,31,2,%arg3             */
  80     { 0x0ee81093, -1 }, /*      ldw 4(%arg3), %r19              */
  81     { 0x0ee01097, -1 }, /*      ldw 0(%arg3), %arg3             */
  82                         /* 1:                                   */
  83     { 0xe8404000, -1 }, /*      blr %r0, %rp                    */
  84     { 0xeae0c002, -1 }, /*      bv,n %r0(%arg3)                 */
  85     { 0x08000240, -1 }, /*       nop                            */
  86
  87     { 0x0803025a, -1 }, /*      copy %r3, %arg0                 */
  88     { 0x20200801, -1 }, /*      ldil -40000000, %r1             */
  89     { 0xe420e008, -1 }, /*      be,l 4(%sr7, %r1), %sr0, %r31   */
  90     { 0x34160268, -1 }, /*       ldi 134, %t1 ; SYS_setcontext  */
  91
  92     { 0x081c025a, -1 }, /*      copy ret0, %arg0                */
  93     { 0x20200801, -1 }, /*      ldil -40000000, %r1             */
  94     { 0xe420e008, -1 }, /*      be,l 4(%sr7, %r1), %sr0, %r31   */
  95     { 0x34160002, -1 }, /*       ldi 1, %t1 ; SYS_exit          */
  96     { TRAMP_SENTINEL_INSN, -1 }
  97   },
  98   hppanbsd_sigtramp_cache_init
  99 };
 100
 101
 102 static void
 103 hppanbsd_sigtramp_cache_init (const struct tramp_frame *self,
 104                              struct frame_info *next_frame,
 105                              struct trad_frame_cache *this_cache,
 106                              CORE_ADDR func)
 107 {
 108   struct gdbarch *gdbarch = get_frame_arch (next_frame);
 109   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 110   CORE_ADDR sp = frame_unwind_register_unsigned (next_frame, HPPA_SP_REGNUM);
 111   CORE_ADDR base;
 112   int *reg_offset;
 113   int num_regs;
 114   int i;
 115
 116   reg_offset = hppanbsd_mc_reg_offset;
 117   num_regs = ARRAY_SIZE (hppanbsd_mc_reg_offset);
 118
 119   /* frame pointer */
 120   base = sp - 0x280;
 121   /* offsetof(struct sigframe_siginfo, sf_uc) = 128 */
 122   base += 128;
 123   /* offsetof(ucontext_t, uc_mcontext) == 40 */
 124   base += 40;
 125
 126   for (i = 0; i < num_regs; i++)
 127     if (reg_offset[i] != -1)
 128       trad_frame_set_reg_addr (this_cache, i, base + reg_offset[i]);
 129
 130   /* Construct the frame ID using the function start.  */
 131   trad_frame_set_id (this_cache, frame_id_build (sp, func));
 132 }
 133
 134 /* Core file support.  */
 135
 136 /* Sizeof `struct reg' in <machine/reg.h>.  */
 137 #define HPPANBSD_SIZEOF_GREGS   (44 * 4)
 138
 139 static int hppanbsd_reg_offset[] =
 140 {
 141   /* r0 ... r31 */
 142       -1,   1 * 4,   2 * 4,   3 * 4,
 143    4 * 4,   5 * 4,   6 * 4,   7 * 4,
 144    8 * 4,   9 * 4,  10 * 4,  11 * 4,
 145   12 * 4,  13 * 4,  14 * 4,  15 * 4,
 146   16 * 4,  17 * 4,  18 * 4,  19 * 4,
 147   20 * 4,  21 * 4,  22 * 4,  23 * 4,
 148   24 * 4,  25 * 4,  26 * 4,  27 * 4,
 149   28 * 4,  29 * 4,  30 * 4,  31 * 4,
 150
 151   32 * 4,       /* HPPA_SAR_REGNUM */
 152   35 * 4,       /* HPPA_PCOQ_HEAD_REGNUM */
 153   33 * 4,       /* HPPA_PCSQ_HEAD_REGNUM */
 154   36 * 4,       /* HPPA_PCOQ_TAIL_REGNUM */
 155   34 * 4,       /* HPPA_PCSQ_TAIL_REGNUM */
 156   -1,           /* HPPA_EIEM_REGNUM */
 157   -1,           /* HPPA_IIR_REGNUM */
 158   -1,           /* HPPA_ISR_REGNUM */
 159   -1,           /* HPPA_IOR_REGNUM */
 160   0 * 4,        /* HPPA_IPSW_REGNUM */
 161 };
 162
 163 /* Supply register REGNUM from the buffer specified by GREGS and LEN
 164    in the general-purpose register set REGSET to register cache
 165    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
 166
 167 static void
 168 hppanbsd_supply_gregset (const struct regset *regset, struct regcache *regcache,
 169                      int regnum, const void *gregs, size_t len)
 170 {
 171   const gdb_byte *regs = gregs;
 172   size_t offset;
 173   int i;
 174
 175   gdb_assert (len >= HPPANBSD_SIZEOF_GREGS);
 176
 177   for (i = 0; i < ARRAY_SIZE (hppanbsd_reg_offset); i++)
 178     if (hppanbsd_reg_offset[i] != -1)
 179       if (regnum == -1 || regnum == i)
 180         regcache_raw_supply (regcache, i, regs + hppanbsd_reg_offset[i]);
 181 }
 182
 183 /* NetBSD/hppa register set.  */
 184
 185 static struct regset hppanbsd_gregset =
 186 {
 187   NULL,
 188   hppanbsd_supply_gregset
 189 };
 190
 191 /* Return the appropriate register set for the core section identified
 192    by SECT_NAME and SECT_SIZE.  */
 193
 194 static const struct regset *
 195 hppanbsd_regset_from_core_section (struct gdbarch *gdbarch,
 196                                   const char *sect_name, size_t sect_size)
 197 {
 198   if (strcmp (sect_name, ".reg") == 0 && sect_size >= HPPANBSD_SIZEOF_GREGS)
 199     return &hppanbsd_gregset;
 200
 201   return NULL;
 202 }
 203 \f
 204 void hppabsd_init_abi (struct gdbarch_info, struct gdbarch *);
 205
 206 static void
 207 hppanbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 208 {
 209   /* Obviously NetBSD is BSD-based.  */
 210   hppabsd_init_abi (info, gdbarch);
 211
 212   /* Core file support.  */
 213   set_gdbarch_regset_from_core_section
 214     (gdbarch, hppanbsd_regset_from_core_section);
 215
 216   tramp_frame_prepend_unwinder (gdbarch, &hppanbsd_sigtramp_si4);
 217 }
 218 \f
 219
 220 /* Provide a prototype to silence -Wmissing-prototypes.  */
 221 void _initialize_hppabsd_tdep (void);
 222
 223 void
 224 _initialize_hppanbsd_tdep (void)
 225 {
 226   gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_NETBSD_ELF,
 227                           hppanbsd_init_abi);
 228 }