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mips64-obsd-tdep.c revision 1.1.1.3.2.1 
      1 /* Target-dependent code for OpenBSD/mips64.
      2 
      3    Copyright (C) 2004-2023 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 "gdbtypes.h"
     22 #include "osabi.h"
     23 #include "regcache.h"
     24 #include "regset.h"
     25 #include "trad-frame.h"
     26 #include "tramp-frame.h"
     27 
     28 #include "obsd-tdep.h"
     29 #include "mips-tdep.h"
     30 #include "solib-svr4.h"
     31 
     32 #define MIPS64OBSD_NUM_REGS 73
     33 
     34 /* Core file support.  */
     35 
     36 /* Supply register REGNUM from the buffer specified by GREGS and LEN
     37    in the general-purpose register set REGSET to register cache
     38    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
     39 
     40 static void
     41 mips64obsd_supply_gregset (const struct regset *regset,
     42 			   struct regcache *regcache, int regnum,
     43 			   const void *gregs, size_t len)
     44 {
     45   const char *regs = (const char *) gregs;
     46   int i;
     47 
     48   for (i = 0; i < MIPS64OBSD_NUM_REGS; i++)
     49     {
     50       if (regnum == i || regnum == -1)
     51 	regcache->raw_supply (i, regs + i * 8);
     52     }
     53 }
     54 
     55 /* OpenBSD/mips64 register set.  */
     56 
     57 static const struct regset mips64obsd_gregset =
     58 {
     59   NULL,
     60   mips64obsd_supply_gregset
     61 };
     62 
     63 /* Iterate over core file register note sections.  */
     64 
     65 static void
     66 mips64obsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
     67 					 iterate_over_regset_sections_cb *cb,
     68 					 void *cb_data,
     69 					 const struct regcache *regcache)
     70 {
     71   cb (".reg", MIPS64OBSD_NUM_REGS * 8, MIPS64OBSD_NUM_REGS * 8,
     72       &mips64obsd_gregset, NULL, cb_data);
     73 }
     74 
     75 
     77 /* Signal trampolines.  */
     78 
     79 static void
     80 mips64obsd_sigframe_init (const struct tramp_frame *self,
     81 			  frame_info_ptr this_frame,
     82 			  struct trad_frame_cache *cache,
     83 			  CORE_ADDR func)
     84 {
     85   struct gdbarch *gdbarch = get_frame_arch (this_frame);
     86   CORE_ADDR sp, sigcontext_addr, addr;
     87   int regnum;
     88 
     89   /* We find the appropriate instance of `struct sigcontext' at a
     90      fixed offset in the signal frame.  */
     91   sp = get_frame_register_signed (this_frame,
     92 				  MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch));
     93   sigcontext_addr = sp + 32;
     94 
     95   /* PC.  */
     96   regnum = mips_regnum (gdbarch)->pc;
     97   trad_frame_set_reg_addr (cache,
     98 			   regnum + gdbarch_num_regs (gdbarch),
     99 			    sigcontext_addr + 16);
    100 
    101   /* GPRs.  */
    102   for (regnum = MIPS_AT_REGNUM, addr = sigcontext_addr + 32;
    103        regnum <= MIPS_RA_REGNUM; regnum++, addr += 8)
    104     trad_frame_set_reg_addr (cache,
    105 			     regnum + gdbarch_num_regs (gdbarch),
    106 			     addr);
    107 
    108   /* HI and LO.  */
    109   regnum = mips_regnum (gdbarch)->lo;
    110   trad_frame_set_reg_addr (cache,
    111 			   regnum + gdbarch_num_regs (gdbarch),
    112 			   sigcontext_addr + 280);
    113   regnum = mips_regnum (gdbarch)->hi;
    114   trad_frame_set_reg_addr (cache,
    115 			   regnum + gdbarch_num_regs (gdbarch),
    116 			   sigcontext_addr + 288);
    117 
    118   /* TODO: Handle the floating-point registers.  */
    119 
    120   trad_frame_set_id (cache, frame_id_build (sp, func));
    121 }
    122 
    123 static const struct tramp_frame mips64obsd_sigframe =
    124 {
    125   SIGTRAMP_FRAME,
    126   MIPS_INSN32_SIZE,
    127   {
    128     { 0x67a40020, ULONGEST_MAX },		/* daddiu  a0,sp,32 */
    129     { 0x24020067, ULONGEST_MAX },		/* li      v0,103 */
    130     { 0x0000000c, ULONGEST_MAX },		/* syscall */
    131     { 0x0000000d, ULONGEST_MAX },		/* break */
    132     { TRAMP_SENTINEL_INSN, ULONGEST_MAX }
    133   },
    134   mips64obsd_sigframe_init
    135 };
    136 
    137 
    138 static void
    140 mips64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
    141 {
    142   /* OpenBSD/mips64 only supports the n64 ABI, but the braindamaged
    143      way GDB works, forces us to pretend we can handle them all.  */
    144 
    145   set_gdbarch_iterate_over_regset_sections
    146     (gdbarch, mips64obsd_iterate_over_regset_sections);
    147 
    148   tramp_frame_prepend_unwinder (gdbarch, &mips64obsd_sigframe);
    149 
    150   set_gdbarch_long_double_bit (gdbarch, 128);
    151   set_gdbarch_long_double_format (gdbarch, floatformats_ieee_quad);
    152 
    153   obsd_init_abi(info, gdbarch);
    154 
    155   /* OpenBSD/mips64 has SVR4-style shared libraries.  */
    156   set_solib_svr4_fetch_link_map_offsets
    157     (gdbarch, svr4_lp64_fetch_link_map_offsets);
    158 }
    159 
    160 void _initialize_mips64obsd_tdep ();
    161 void
    162 _initialize_mips64obsd_tdep ()
    163 {
    164   gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_OPENBSD,
    165 			  mips64obsd_init_abi);
    166 }
    167