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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [gdb/] [sparc64fbsd-tdep.c] - Blame information for rev 832

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1 227 jeremybenn
/* Target-dependent code for FreeBSD/sparc64.
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   Copyright (C) 2003, 2004, 2005, 2007, 2008, 2009, 2010
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   Free Software Foundation, Inc.
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   This file is part of GDB.
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   This program is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3 of the License, or
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   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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#include "defs.h"
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#include "frame.h"
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#include "frame-unwind.h"
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#include "gdbcore.h"
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#include "osabi.h"
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#include "regcache.h"
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#include "regset.h"
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#include "target.h"
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#include "trad-frame.h"
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#include "gdb_assert.h"
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#include "gdb_string.h"
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#include "sparc64-tdep.h"
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#include "solib-svr4.h"
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/* From <machine/reg.h>.  */
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const struct sparc_gregset sparc64fbsd_gregset =
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{
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  26 * 8,                       /* "tstate" */
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  25 * 8,                       /* %pc */
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  24 * 8,                       /* %npc */
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  28 * 8,                       /* %y */
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  16 * 8,                       /* %fprs */
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  -1,
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  1 * 8,                        /* %g1 */
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  -1,                           /* %l0 */
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  8                             /* sizeof (%y) */
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};
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static void
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sparc64fbsd_supply_gregset (const struct regset *regset,
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                            struct regcache *regcache,
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                            int regnum, const void *gregs, size_t len)
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{
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  sparc64_supply_gregset (&sparc64fbsd_gregset, regcache, regnum, gregs);
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}
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static void
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sparc64fbsd_collect_gregset (const struct regset *regset,
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                             const struct regcache *regcache,
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                             int regnum, void *gregs, size_t len)
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{
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  sparc64_collect_gregset (&sparc64fbsd_gregset, regcache, regnum, gregs);
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}
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static void
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sparc64fbsd_supply_fpregset (const struct regset *regset,
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                             struct regcache *regcache,
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                             int regnum, const void *fpregs, size_t len)
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{
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  sparc64_supply_fpregset (regcache, regnum, fpregs);
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}
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static void
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sparc64fbsd_collect_fpregset (const struct regset *regset,
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                              const struct regcache *regcache,
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                              int regnum, void *fpregs, size_t len)
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{
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  sparc64_collect_fpregset (regcache, regnum, fpregs);
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}
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/* Signal trampolines.  */
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static int
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sparc64fbsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
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{
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  return (name && strcmp (name, "__sigtramp") == 0);
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}
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static struct sparc_frame_cache *
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sparc64fbsd_sigtramp_frame_cache (struct frame_info *this_frame,
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                                   void **this_cache)
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{
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  struct sparc_frame_cache *cache;
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  CORE_ADDR addr, mcontext_addr, sp;
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  LONGEST fprs;
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  int regnum;
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  if (*this_cache)
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    return *this_cache;
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  cache = sparc_frame_cache (this_frame, this_cache);
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  gdb_assert (cache == *this_cache);
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  cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
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  /* The third argument is a pointer to an instance of `ucontext_t',
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     which has a member `uc_mcontext' that contains the saved
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     registers.  */
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  addr = get_frame_register_unsigned (this_frame, SPARC_O2_REGNUM);
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  mcontext_addr = addr + 64;
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  /* The following registers travel in the `mc_local' slots of
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     `mcontext_t'.  */
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  addr = mcontext_addr + 16 * 8;
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  cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 0 * 8;
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  cache->saved_regs[SPARC64_FSR_REGNUM].addr = addr + 1 * 8;
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  /* The following registers travel in the `mc_in' slots of
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     `mcontext_t'.  */
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  addr = mcontext_addr + 24 * 8;
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  cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 0 * 8;
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  cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 1 * 8;
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  cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 2 * 8;
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  cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 4 * 8;
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  /* The `global' and `out' registers travel in the `mc_global' and
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     `mc_out' slots of `mcontext_t', except for %g0.  Since %g0 is
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     always zero, keep the identity encoding.  */
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  for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8;
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       regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
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    cache->saved_regs[regnum].addr = addr;
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  /* The `local' and `in' registers have been saved in the register
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     save area.  */
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  addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
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  sp = get_frame_memory_unsigned (this_frame, addr, 8);
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  for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
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       regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
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    cache->saved_regs[regnum].addr = addr;
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  /* The floating-point registers are only saved if the FEF bit in
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     %fprs has been set.  */
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#define FPRS_FEF        (1 << 2)
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  addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr;
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  fprs = get_frame_memory_unsigned (this_frame, addr, 8);
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  if (fprs & FPRS_FEF)
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    {
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      for (regnum = SPARC_F0_REGNUM, addr = mcontext_addr + 32 * 8;
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           regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
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        cache->saved_regs[regnum].addr = addr;
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      for (regnum = SPARC64_F32_REGNUM;
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           regnum <= SPARC64_F62_REGNUM; regnum++, addr += 8)
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        cache->saved_regs[regnum].addr = addr;
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    }
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  return cache;
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}
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static void
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sparc64fbsd_sigtramp_frame_this_id (struct frame_info *this_frame,
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                                    void **this_cache,
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                                    struct frame_id *this_id)
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{
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  struct sparc_frame_cache *cache =
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    sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);
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  (*this_id) = frame_id_build (cache->base, cache->pc);
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}
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static struct value *
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sparc64fbsd_sigtramp_frame_prev_register (struct frame_info *this_frame,
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                                          void **this_cache, int regnum)
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{
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  struct sparc_frame_cache *cache =
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    sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);
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  return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
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}
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static int
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sparc64fbsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
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                                    struct frame_info *this_frame,
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                                    void **this_cache)
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{
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  CORE_ADDR pc = get_frame_pc (this_frame);
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  char *name;
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  find_pc_partial_function (pc, &name, NULL, NULL);
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  if (sparc64fbsd_pc_in_sigtramp (pc, name))
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    return 1;
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  return 0;
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}
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static const struct frame_unwind sparc64fbsd_sigtramp_frame_unwind =
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{
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  SIGTRAMP_FRAME,
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  sparc64fbsd_sigtramp_frame_this_id,
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  sparc64fbsd_sigtramp_frame_prev_register,
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  NULL,
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  sparc64fbsd_sigtramp_frame_sniffer
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};
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static void
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sparc64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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  tdep->gregset = regset_alloc (gdbarch, sparc64fbsd_supply_gregset,
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                                sparc64fbsd_collect_gregset);
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  tdep->sizeof_gregset = 256;
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  tdep->fpregset = regset_alloc (gdbarch, sparc64fbsd_supply_fpregset,
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                                 sparc64fbsd_collect_fpregset);
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  tdep->sizeof_fpregset = 272;
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  frame_unwind_append_unwinder (gdbarch, &sparc64fbsd_sigtramp_frame_unwind);
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  sparc64_init_abi (info, gdbarch);
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  /* FreeBSD/sparc64 has SVR4-style shared libraries.  */
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  set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
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  set_solib_svr4_fetch_link_map_offsets
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    (gdbarch, svr4_lp64_fetch_link_map_offsets);
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}
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/* Provide a prototype to silence -Wmissing-prototypes.  */
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void _initialize_sparc64fbsd_tdep (void);
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void
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_initialize_sparc64fbsd_tdep (void)
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{
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  gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
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                          GDB_OSABI_FREEBSD_ELF, sparc64fbsd_init_abi);
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}

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