gdb/hppa-netbsd-tdep.c

   1 /* Target-dependent code for NetBSD/hppa
   2
   3    Copyright (C) 2008-2022 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 3 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, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "osabi.h"
  22 #include "regcache.h"
  23 #include "regset.h"
  24
  25 #include "trad-frame.h"
  26 #include "tramp-frame.h"
  27
  28 #include "hppa-tdep.h"
  29 #include "hppa-bsd-tdep.h"
  30 #include "netbsd-tdep.h"
  31 #include "gdbarch.h"
  32
  33 /* From <machine/mcontext.h>.  */
  34 static int hppanbsd_mc_reg_offset[] =
  35 {
  36   /* r0 ... r31 */
  37       -1,   1 * 4,   2 * 4,   3 * 4,
  38    4 * 4,   5 * 4,   6 * 4,   7 * 4,
  39    8 * 4,   9 * 4,  10 * 4,  11 * 4,
  40   12 * 4,  13 * 4,  14 * 4,  15 * 4,
  41   16 * 4,  17 * 4,  18 * 4,  19 * 4,
  42   20 * 4,  21 * 4,  22 * 4,  23 * 4,
  43   24 * 4,  25 * 4,  26 * 4,  27 * 4,
  44   28 * 4,  29 * 4,  30 * 4,  31 * 4,
  45
  46   32 * 4,       /* HPPA_SAR_REGNUM */
  47   35 * 4,       /* HPPA_PCOQ_HEAD_REGNUM */
  48   33 * 4,       /* HPPA_PCSQ_HEAD_REGNUM */
  49   36 * 4,       /* HPPA_PCOQ_TAIL_REGNUM */
  50   34 * 4,       /* HPPA_PCSQ_TAIL_REGNUM */
  51   -1,           /* HPPA_EIEM_REGNUM */
  52   -1,           /* HPPA_IIR_REGNUM */
  53   -1,           /* HPPA_ISR_REGNUM */
  54   -1,           /* HPPA_IOR_REGNUM */
  55   0 * 4,        /* HPPA_IPSW_REGNUM */
  56   -1,           /* spare? */
  57   41 * 4,       /* HPPA_SR4_REGNUM */
  58   37 * 4,       /* sr0 */
  59   38 * 4,       /* sr1 */
  60   39 * 4,       /* sr2 */
  61   40 * 4,       /* sr3 */
  62
  63   /* more tbd */
  64 };
  65
  66 static void hppanbsd_sigtramp_cache_init (const struct tramp_frame *,
  67                                          struct frame_info *,
  68                                          struct trad_frame_cache *,
  69                                          CORE_ADDR);
  70
  71 static const struct tramp_frame hppanbsd_sigtramp_si4 =
  72 {
  73   SIGTRAMP_FRAME,
  74   4,
  75   {
  76     { 0xc7d7c012, ULONGEST_MAX },       /*      bb,>=,n %arg3, 30, 1f           */
  77     { 0xd6e01c1e, ULONGEST_MAX },       /*       depwi 0,31,2,%arg3             */
  78     { 0x0ee81093, ULONGEST_MAX },       /*      ldw 4(%arg3), %r19              */
  79     { 0x0ee01097, ULONGEST_MAX },       /*      ldw 0(%arg3), %arg3             */
  80                         /* 1:                                   */
  81     { 0xe8404000, ULONGEST_MAX },       /*      blr %r0, %rp                    */
  82     { 0xeae0c002, ULONGEST_MAX },       /*      bv,n %r0(%arg3)                 */
  83     { 0x08000240, ULONGEST_MAX },       /*       nop                            */
  84
  85     { 0x0803025a, ULONGEST_MAX },       /*      copy %r3, %arg0                 */
  86     { 0x20200801, ULONGEST_MAX },       /*      ldil -40000000, %r1             */
  87     { 0xe420e008, ULONGEST_MAX },       /*      be,l 4(%sr7, %r1), %sr0, %r31   */
  88     { 0x34160268, ULONGEST_MAX },       /*       ldi 134, %t1 ; SYS_setcontext  */
  89
  90     { 0x081c025a, ULONGEST_MAX },       /*      copy ret0, %arg0                */
  91     { 0x20200801, ULONGEST_MAX },       /*      ldil -40000000, %r1             */
  92     { 0xe420e008, ULONGEST_MAX },       /*      be,l 4(%sr7, %r1), %sr0, %r31   */
  93     { 0x34160002, ULONGEST_MAX },       /*       ldi 1, %t1 ; SYS_exit          */
  94     { TRAMP_SENTINEL_INSN, ULONGEST_MAX }
  95   },
  96   hppanbsd_sigtramp_cache_init
  97 };
  98
  99
 100 static void
 101 hppanbsd_sigtramp_cache_init (const struct tramp_frame *self,
 102                              struct frame_info *this_frame,
 103                              struct trad_frame_cache *this_cache,
 104                              CORE_ADDR func)
 105 {
 106   CORE_ADDR sp = get_frame_register_unsigned (this_frame, HPPA_SP_REGNUM);
 107   CORE_ADDR base;
 108   int *reg_offset;
 109   int num_regs;
 110   int i;
 111
 112   reg_offset = hppanbsd_mc_reg_offset;
 113   num_regs = ARRAY_SIZE (hppanbsd_mc_reg_offset);
 114
 115   /* frame pointer */
 116   base = sp - 0x280;
 117   /* offsetof(struct sigframe_siginfo, sf_uc) = 128 */
 118   base += 128;
 119   /* offsetof(ucontext_t, uc_mcontext) == 40 */
 120   base += 40;
 121
 122   for (i = 0; i < num_regs; i++)
 123     if (reg_offset[i] != -1)
 124       trad_frame_set_reg_addr (this_cache, i, base + reg_offset[i]);
 125
 126   /* Construct the frame ID using the function start.  */
 127   trad_frame_set_id (this_cache, frame_id_build (sp, func));
 128 }
 129
 130 /* Core file support.  */
 131
 132 /* Sizeof `struct reg' in <machine/reg.h>.  */
 133 #define HPPANBSD_SIZEOF_GREGS   (44 * 4)
 134
 135 static int hppanbsd_reg_offset[] =
 136 {
 137   /* r0 ... r31 */
 138       -1,   1 * 4,   2 * 4,   3 * 4,
 139    4 * 4,   5 * 4,   6 * 4,   7 * 4,
 140    8 * 4,   9 * 4,  10 * 4,  11 * 4,
 141   12 * 4,  13 * 4,  14 * 4,  15 * 4,
 142   16 * 4,  17 * 4,  18 * 4,  19 * 4,
 143   20 * 4,  21 * 4,  22 * 4,  23 * 4,
 144   24 * 4,  25 * 4,  26 * 4,  27 * 4,
 145   28 * 4,  29 * 4,  30 * 4,  31 * 4,
 146
 147   32 * 4,       /* HPPA_SAR_REGNUM */
 148   35 * 4,       /* HPPA_PCOQ_HEAD_REGNUM */
 149   33 * 4,       /* HPPA_PCSQ_HEAD_REGNUM */
 150   36 * 4,       /* HPPA_PCOQ_TAIL_REGNUM */
 151   34 * 4,       /* HPPA_PCSQ_TAIL_REGNUM */
 152   -1,           /* HPPA_EIEM_REGNUM */
 153   -1,           /* HPPA_IIR_REGNUM */
 154   -1,           /* HPPA_ISR_REGNUM */
 155   -1,           /* HPPA_IOR_REGNUM */
 156   0 * 4,        /* HPPA_IPSW_REGNUM */
 157 };
 158
 159 /* Supply register REGNUM from the buffer specified by GREGS and LEN
 160    in the general-purpose register set REGSET to register cache
 161    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
 162
 163 static void
 164 hppanbsd_supply_gregset (const struct regset *regset,
 165                          struct regcache *regcache,
 166                          int regnum, const void *gregs, size_t len)
 167 {
 168   const gdb_byte *regs = (const gdb_byte *) gregs;
 169   int i;
 170
 171   gdb_assert (len >= HPPANBSD_SIZEOF_GREGS);
 172
 173   for (i = 0; i < ARRAY_SIZE (hppanbsd_reg_offset); i++)
 174     if (hppanbsd_reg_offset[i] != -1)
 175       if (regnum == -1 || regnum == i)
 176         regcache->raw_supply (i, regs + hppanbsd_reg_offset[i]);
 177 }
 178
 179 /* NetBSD/hppa register set.  */
 180
 181 static const struct regset hppanbsd_gregset =
 182 {
 183   NULL,
 184   hppanbsd_supply_gregset
 185 };
 186
 187 /* Iterate over supported core file register note sections. */
 188
 189 static void
 190 hppanbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
 191                                        iterate_over_regset_sections_cb *cb,
 192                                        void *cb_data,
 193                                        const struct regcache *regcache)
 194 {
 195   cb (".reg", HPPANBSD_SIZEOF_GREGS, HPPANBSD_SIZEOF_GREGS, &hppanbsd_gregset,
 196       NULL, cb_data);
 197 }
 198 \f
 199 static void
 200 hppanbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 201 {
 202   /* Obviously NetBSD is BSD-based.  */
 203   hppabsd_init_abi (info, gdbarch);
 204
 205   nbsd_init_abi (info, gdbarch);
 206
 207   /* Core file support.  */
 208   set_gdbarch_iterate_over_regset_sections
 209     (gdbarch, hppanbsd_iterate_over_regset_sections);
 210
 211   tramp_frame_prepend_unwinder (gdbarch, &hppanbsd_sigtramp_si4);
 212 }
 213
 214 void _initialize_hppanbsd_tdep ();
 215 void
 216 _initialize_hppanbsd_tdep ()
 217 {
 218   gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_NETBSD,
 219                           hppanbsd_init_abi);
 220 }