gdb/hppa-nbsd-tdep.c

   1 /* Target-dependent code for NetBSD/hppa
   2
   3    Copyright (C) 2008-2019 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
  31 /* From <machine/mcontext.h>.  */
  32 static int hppanbsd_mc_reg_offset[] =
  33 {
  34   /* r0 ... r31 */
  35       -1,   1 * 4,   2 * 4,   3 * 4,
  36    4 * 4,   5 * 4,   6 * 4,   7 * 4,
  37    8 * 4,   9 * 4,  10 * 4,  11 * 4,
  38   12 * 4,  13 * 4,  14 * 4,  15 * 4,
  39   16 * 4,  17 * 4,  18 * 4,  19 * 4,
  40   20 * 4,  21 * 4,  22 * 4,  23 * 4,
  41   24 * 4,  25 * 4,  26 * 4,  27 * 4,
  42   28 * 4,  29 * 4,  30 * 4,  31 * 4,
  43
  44   32 * 4,       /* HPPA_SAR_REGNUM */
  45   35 * 4,       /* HPPA_PCOQ_HEAD_REGNUM */
  46   33 * 4,       /* HPPA_PCSQ_HEAD_REGNUM */
  47   36 * 4,       /* HPPA_PCOQ_TAIL_REGNUM */
  48   34 * 4,       /* HPPA_PCSQ_TAIL_REGNUM */
  49   -1,           /* HPPA_EIEM_REGNUM */
  50   -1,           /* HPPA_IIR_REGNUM */
  51   -1,           /* HPPA_ISR_REGNUM */
  52   -1,           /* HPPA_IOR_REGNUM */
  53   0 * 4,        /* HPPA_IPSW_REGNUM */
  54   -1,           /* spare? */
  55   41 * 4,       /* HPPA_SR4_REGNUM */
  56   37 * 4,       /* sr0 */
  57   38 * 4,       /* sr1 */
  58   39 * 4,       /* sr2 */
  59   40 * 4,       /* sr3 */
  60
  61   /* more tbd */
  62 };
  63
  64 static void hppanbsd_sigtramp_cache_init (const struct tramp_frame *,
  65                                          struct frame_info *,
  66                                          struct trad_frame_cache *,
  67                                          CORE_ADDR);
  68
  69 static const struct tramp_frame hppanbsd_sigtramp_si4 =
  70 {
  71   SIGTRAMP_FRAME,
  72   4,
  73   {
  74     { 0xc7d7c012, ULONGEST_MAX },       /*      bb,>=,n %arg3, 30, 1f           */
  75     { 0xd6e01c1e, ULONGEST_MAX },       /*       depwi 0,31,2,%arg3             */
  76     { 0x0ee81093, ULONGEST_MAX },       /*      ldw 4(%arg3), %r19              */
  77     { 0x0ee01097, ULONGEST_MAX },       /*      ldw 0(%arg3), %arg3             */
  78                         /* 1:                                   */
  79     { 0xe8404000, ULONGEST_MAX },       /*      blr %r0, %rp                    */
  80     { 0xeae0c002, ULONGEST_MAX },       /*      bv,n %r0(%arg3)                 */
  81     { 0x08000240, ULONGEST_MAX },       /*       nop                            */
  82
  83     { 0x0803025a, ULONGEST_MAX },       /*      copy %r3, %arg0                 */
  84     { 0x20200801, ULONGEST_MAX },       /*      ldil -40000000, %r1             */
  85     { 0xe420e008, ULONGEST_MAX },       /*      be,l 4(%sr7, %r1), %sr0, %r31   */
  86     { 0x34160268, ULONGEST_MAX },       /*       ldi 134, %t1 ; SYS_setcontext  */
  87
  88     { 0x081c025a, ULONGEST_MAX },       /*      copy ret0, %arg0                */
  89     { 0x20200801, ULONGEST_MAX },       /*      ldil -40000000, %r1             */
  90     { 0xe420e008, ULONGEST_MAX },       /*      be,l 4(%sr7, %r1), %sr0, %r31   */
  91     { 0x34160002, ULONGEST_MAX },       /*       ldi 1, %t1 ; SYS_exit          */
  92     { TRAMP_SENTINEL_INSN, ULONGEST_MAX }
  93   },
  94   hppanbsd_sigtramp_cache_init
  95 };
  96
  97
  98 static void
  99 hppanbsd_sigtramp_cache_init (const struct tramp_frame *self,
 100                              struct frame_info *this_frame,
 101                              struct trad_frame_cache *this_cache,
 102                              CORE_ADDR func)
 103 {
 104   CORE_ADDR sp = get_frame_register_unsigned (this_frame, HPPA_SP_REGNUM);
 105   CORE_ADDR base;
 106   int *reg_offset;
 107   int num_regs;
 108   int i;
 109
 110   reg_offset = hppanbsd_mc_reg_offset;
 111   num_regs = ARRAY_SIZE (hppanbsd_mc_reg_offset);
 112
 113   /* frame pointer */
 114   base = sp - 0x280;
 115   /* offsetof(struct sigframe_siginfo, sf_uc) = 128 */
 116   base += 128;
 117   /* offsetof(ucontext_t, uc_mcontext) == 40 */
 118   base += 40;
 119
 120   for (i = 0; i < num_regs; i++)
 121     if (reg_offset[i] != -1)
 122       trad_frame_set_reg_addr (this_cache, i, base + reg_offset[i]);
 123
 124   /* Construct the frame ID using the function start.  */
 125   trad_frame_set_id (this_cache, frame_id_build (sp, func));
 126 }
 127
 128 /* Core file support.  */
 129
 130 /* Sizeof `struct reg' in <machine/reg.h>.  */
 131 #define HPPANBSD_SIZEOF_GREGS   (44 * 4)
 132
 133 static int hppanbsd_reg_offset[] =
 134 {
 135   /* r0 ... r31 */
 136       -1,   1 * 4,   2 * 4,   3 * 4,
 137    4 * 4,   5 * 4,   6 * 4,   7 * 4,
 138    8 * 4,   9 * 4,  10 * 4,  11 * 4,
 139   12 * 4,  13 * 4,  14 * 4,  15 * 4,
 140   16 * 4,  17 * 4,  18 * 4,  19 * 4,
 141   20 * 4,  21 * 4,  22 * 4,  23 * 4,
 142   24 * 4,  25 * 4,  26 * 4,  27 * 4,
 143   28 * 4,  29 * 4,  30 * 4,  31 * 4,
 144
 145   32 * 4,       /* HPPA_SAR_REGNUM */
 146   35 * 4,       /* HPPA_PCOQ_HEAD_REGNUM */
 147   33 * 4,       /* HPPA_PCSQ_HEAD_REGNUM */
 148   36 * 4,       /* HPPA_PCOQ_TAIL_REGNUM */
 149   34 * 4,       /* HPPA_PCSQ_TAIL_REGNUM */
 150   -1,           /* HPPA_EIEM_REGNUM */
 151   -1,           /* HPPA_IIR_REGNUM */
 152   -1,           /* HPPA_ISR_REGNUM */
 153   -1,           /* HPPA_IOR_REGNUM */
 154   0 * 4,        /* HPPA_IPSW_REGNUM */
 155 };
 156
 157 /* Supply register REGNUM from the buffer specified by GREGS and LEN
 158    in the general-purpose register set REGSET to register cache
 159    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
 160
 161 static void
 162 hppanbsd_supply_gregset (const struct regset *regset,
 163                          struct regcache *regcache,
 164                          int regnum, const void *gregs, size_t len)
 165 {
 166   const gdb_byte *regs = (const gdb_byte *) gregs;
 167   int i;
 168
 169   gdb_assert (len >= HPPANBSD_SIZEOF_GREGS);
 170
 171   for (i = 0; i < ARRAY_SIZE (hppanbsd_reg_offset); i++)
 172     if (hppanbsd_reg_offset[i] != -1)
 173       if (regnum == -1 || regnum == i)
 174         regcache->raw_supply (i, regs + hppanbsd_reg_offset[i]);
 175 }
 176
 177 /* NetBSD/hppa register set.  */
 178
 179 static const struct regset hppanbsd_gregset =
 180 {
 181   NULL,
 182   hppanbsd_supply_gregset
 183 };
 184
 185 /* Iterate over supported core file register note sections. */
 186
 187 static void
 188 hppanbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
 189                                        iterate_over_regset_sections_cb *cb,
 190                                        void *cb_data,
 191                                        const struct regcache *regcache)
 192 {
 193   cb (".reg", HPPANBSD_SIZEOF_GREGS, HPPANBSD_SIZEOF_GREGS, &hppanbsd_gregset,
 194       NULL, cb_data);
 195 }
 196 \f
 197 static void
 198 hppanbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 199 {
 200   /* Obviously NetBSD is BSD-based.  */
 201   hppabsd_init_abi (info, gdbarch);
 202
 203   /* Core file support.  */
 204   set_gdbarch_iterate_over_regset_sections
 205     (gdbarch, hppanbsd_iterate_over_regset_sections);
 206
 207   tramp_frame_prepend_unwinder (gdbarch, &hppanbsd_sigtramp_si4);
 208 }
 209
 210 void
 211 _initialize_hppanbsd_tdep (void)
 212 {
 213   gdbarch_register_osabi (bfd_arch_hppa, 0, GDB_OSABI_NETBSD,
 214                           hppanbsd_init_abi);
 215 }