/home/stan/gdb/src/gdb/sparc64obsd-tdep.c

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/* Target-dependent code for OpenBSD/sparc64.

   Copyright (C) 2004-2013 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"
#include "frame.h"
#include "frame-unwind.h"
#include "gdbcore.h"
#include "osabi.h"
#include "regcache.h"
#include "regset.h"
#include "symtab.h"
#include "objfiles.h"
#include "trad-frame.h"

#include "gdb_assert.h"

#include "obsd-tdep.h"
#include "sparc64-tdep.h"
#include "solib-svr4.h"
#include "bsd-uthread.h"

/* OpenBSD uses the traditional NetBSD core file format, even for
   ports that use ELF.  The core files don't use multiple register
   sets.  Instead, the general-purpose and floating-point registers
   are lumped together in a single section.  Unlike on NetBSD, OpenBSD
   uses a different layout for its general-purpose registers than the
   layout used for ptrace(2).  */

/* From <machine/reg.h>.  */
const struct sparc_gregset sparc64obsd_core_gregset =
{
  0 * 8,                        /* "tstate" */
  1 * 8,                        /* %pc */
  2 * 8,                        /* %npc */
  3 * 8,                        /* %y */
  -1,                           /* %fprs */
  -1,
  7 * 8,                        /* %g1 */
  22 * 8,                       /* %l0 */
  4                             /* sizeof (%y) */
};

static void
sparc64obsd_supply_gregset (const struct regset *regset,
                            struct regcache *regcache,
                            int regnum, const void *gregs, size_t len)
{
  const char *regs = gregs;

  sparc64_supply_gregset (&sparc64obsd_core_gregset, regcache, regnum, regs);
  sparc64_supply_fpregset (&sparc64_bsd_fpregset, regcache, regnum, regs + 288);
}


/* Signal trampolines.  */

/* Since OpenBSD 3.2, the sigtramp routine is mapped at a random page
   in virtual memory.  The randomness makes it somewhat tricky to
   detect it, but fortunately we can rely on the fact that the start
   of the sigtramp routine is page-aligned.  We recognize the
   trampoline by looking for the code that invokes the sigreturn
   system call.  The offset where we can find that code varies from
   release to release.

   By the way, the mapping mentioned above is read-only, so you cannot
   place a breakpoint in the signal trampoline.  */

/* Default page size.  */
static const int sparc64obsd_page_size = 8192;

/* Offset for sigreturn(2).  */
static const int sparc64obsd_sigreturn_offset[] = {
  0xf0,                         /* OpenBSD 3.8 */
  0xec,                         /* OpenBSD 3.6 */
  0xe8,                         /* OpenBSD 3.2 */
  -1
};

static int
sparc64obsd_pc_in_sigtramp (CORE_ADDR pc, const char *name)
{
  CORE_ADDR start_pc = (pc & ~(sparc64obsd_page_size - 1));
  unsigned long insn;
  const int *offset;

  if (name)
    return 0;

  for (offset = sparc64obsd_sigreturn_offset; *offset != -1; offset++)
    {
      /* Check for "restore %g0, SYS_sigreturn, %g1".  */
      insn = sparc_fetch_instruction (start_pc + *offset);
      if (insn != 0x83e82067)
        continue;

      /* Check for "t ST_SYSCALL".  */
      insn = sparc_fetch_instruction (start_pc + *offset + 8);
      if (insn != 0x91d02000)
        continue;

      return 1;
    }

  return 0;
}

static struct sparc_frame_cache *
sparc64obsd_frame_cache (struct frame_info *this_frame, void **this_cache)
{
  struct sparc_frame_cache *cache;
  CORE_ADDR addr;

  if (*this_cache)
    return *this_cache;

  cache = sparc_frame_cache (this_frame, this_cache);
  gdb_assert (cache == *this_cache);

  /* If we couldn't find the frame's function, we're probably dealing
     with an on-stack signal trampoline.  */
  if (cache->pc == 0)
    {
      cache->pc = get_frame_pc (this_frame);
      cache->pc &= ~(sparc64obsd_page_size - 1);

      /* Since we couldn't find the frame's function, the cache was
         initialized under the assumption that we're frameless.  */
      sparc_record_save_insn (cache);
      addr = get_frame_register_unsigned (this_frame, SPARC_FP_REGNUM);
      if (addr & 1)
        addr += BIAS;
      cache->base = addr;
    }

  /* We find the appropriate instance of `struct sigcontext' at a
     fixed offset in the signal frame.  */
  addr = cache->base + 128 + 16;
  cache->saved_regs = sparc64nbsd_sigcontext_saved_regs (addr, this_frame);

  return cache;
}

static void
sparc64obsd_frame_this_id (struct frame_info *this_frame, void **this_cache,
                           struct frame_id *this_id)
{
  struct sparc_frame_cache *cache =
    sparc64obsd_frame_cache (this_frame, this_cache);

  (*this_id) = frame_id_build (cache->base, cache->pc);
}

static struct value *
sparc64obsd_frame_prev_register (struct frame_info *this_frame,
                                 void **this_cache, int regnum)
{
  struct sparc_frame_cache *cache =
    sparc64obsd_frame_cache (this_frame, this_cache);

  return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
}

static int
sparc64obsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
                                    struct frame_info *this_frame,
                                    void **this_cache)
{
  CORE_ADDR pc = get_frame_pc (this_frame);
  const char *name;

  find_pc_partial_function (pc, &name, NULL, NULL);
  if (sparc64obsd_pc_in_sigtramp (pc, name))
    return 1;

  return 0;
}

static const struct frame_unwind sparc64obsd_frame_unwind =
{
  SIGTRAMP_FRAME,
  default_frame_unwind_stop_reason,
  sparc64obsd_frame_this_id,
  sparc64obsd_frame_prev_register,
  NULL,
  sparc64obsd_sigtramp_frame_sniffer
};

/* Kernel debugging support.  */

static struct sparc_frame_cache *
sparc64obsd_trapframe_cache (struct frame_info *this_frame, void **this_cache)
{
  struct sparc_frame_cache *cache;
  CORE_ADDR sp, trapframe_addr;
  int regnum;

  if (*this_cache)
    return *this_cache;

  cache = sparc_frame_cache (this_frame, this_cache);
  gdb_assert (cache == *this_cache);

  sp = get_frame_register_unsigned (this_frame, SPARC_SP_REGNUM);
  trapframe_addr = sp + BIAS + 176;

  cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);

  cache->saved_regs[SPARC64_STATE_REGNUM].addr = trapframe_addr;
  cache->saved_regs[SPARC64_PC_REGNUM].addr = trapframe_addr + 8;
  cache->saved_regs[SPARC64_NPC_REGNUM].addr = trapframe_addr + 16;

  for (regnum = SPARC_G0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
    cache->saved_regs[regnum].addr =
      trapframe_addr + 48 + (regnum - SPARC_G0_REGNUM) * 8;

  return cache;
}

static void
sparc64obsd_trapframe_this_id (struct frame_info *this_frame,
                               void **this_cache, struct frame_id *this_id)
{
  struct sparc_frame_cache *cache =
    sparc64obsd_trapframe_cache (this_frame, this_cache);

  (*this_id) = frame_id_build (cache->base, cache->pc);
}

static struct value *
sparc64obsd_trapframe_prev_register (struct frame_info *this_frame,
                                     void **this_cache, int regnum)
{
  struct sparc_frame_cache *cache =
    sparc64obsd_trapframe_cache (this_frame, this_cache);

  return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
}

static int
sparc64obsd_trapframe_sniffer (const struct frame_unwind *self,
                               struct frame_info *this_frame,
                               void **this_cache)
{
  CORE_ADDR pc;
  ULONGEST pstate;
  const char *name;

  /* Check whether we are in privileged mode, and bail out if we're not.  */
  pstate = get_frame_register_unsigned (this_frame, SPARC64_PSTATE_REGNUM);
  if ((pstate & SPARC64_PSTATE_PRIV) == 0)
    return 0;

  pc = get_frame_address_in_block (this_frame);
  find_pc_partial_function (pc, &name, NULL, NULL);
  if (name && strcmp (name, "Lslowtrap_reenter") == 0)
    return 1;

  return 0;
}

static const struct frame_unwind sparc64obsd_trapframe_unwind =
{
  NORMAL_FRAME,
  default_frame_unwind_stop_reason,
  sparc64obsd_trapframe_this_id,
  sparc64obsd_trapframe_prev_register,
  NULL,
  sparc64obsd_trapframe_sniffer
};


/* Threads support.  */

/* Offset wthin the thread structure where we can find %fp and %i7.  */
#define SPARC64OBSD_UTHREAD_FP_OFFSET   232
#define SPARC64OBSD_UTHREAD_PC_OFFSET   240

static void
sparc64obsd_supply_uthread (struct regcache *regcache,
                            int regnum, CORE_ADDR addr)
{
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  CORE_ADDR fp, fp_addr = addr + SPARC64OBSD_UTHREAD_FP_OFFSET;
  gdb_byte buf[8];

  gdb_assert (regnum >= -1);

  fp = read_memory_unsigned_integer (fp_addr, 8, byte_order);
  if (regnum == SPARC_SP_REGNUM || regnum == -1)
    {
      store_unsigned_integer (buf, 8, byte_order, fp);
      regcache_raw_supply (regcache, SPARC_SP_REGNUM, buf);

      if (regnum == SPARC_SP_REGNUM)
        return;
    }

  if (regnum == SPARC64_PC_REGNUM || regnum == SPARC64_NPC_REGNUM
      || regnum == -1)
    {
      CORE_ADDR i7, i7_addr = addr + SPARC64OBSD_UTHREAD_PC_OFFSET;

      i7 = read_memory_unsigned_integer (i7_addr, 8, byte_order);
      if (regnum == SPARC64_PC_REGNUM || regnum == -1)
        {
          store_unsigned_integer (buf, 8, byte_order, i7 + 8);
          regcache_raw_supply (regcache, SPARC64_PC_REGNUM, buf);
        }
      if (regnum == SPARC64_NPC_REGNUM || regnum == -1)
        {
          store_unsigned_integer (buf, 8, byte_order, i7 + 12);
          regcache_raw_supply (regcache, SPARC64_NPC_REGNUM, buf);
        }

      if (regnum == SPARC64_PC_REGNUM || regnum == SPARC64_NPC_REGNUM)
        return;
    }

  sparc_supply_rwindow (regcache, fp, regnum);
}

static void
sparc64obsd_collect_uthread(const struct regcache *regcache,
                            int regnum, CORE_ADDR addr)
{
  struct gdbarch *gdbarch = get_regcache_arch (regcache);
  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  CORE_ADDR sp;
  gdb_byte buf[8];

  gdb_assert (regnum >= -1);

  if (regnum == SPARC_SP_REGNUM || regnum == -1)
    {
      CORE_ADDR fp_addr = addr + SPARC64OBSD_UTHREAD_FP_OFFSET;

      regcache_raw_collect (regcache, SPARC_SP_REGNUM, buf);
      write_memory (fp_addr,buf, 8);
    }

  if (regnum == SPARC64_PC_REGNUM || regnum == -1)
    {
      CORE_ADDR i7, i7_addr = addr + SPARC64OBSD_UTHREAD_PC_OFFSET;

      regcache_raw_collect (regcache, SPARC64_PC_REGNUM, buf);
      i7 = extract_unsigned_integer (buf, 8, byte_order) - 8;
      write_memory_unsigned_integer (i7_addr, 8, byte_order, i7);

      if (regnum == SPARC64_PC_REGNUM)
        return;
    }

  regcache_raw_collect (regcache, SPARC_SP_REGNUM, buf);
  sp = extract_unsigned_integer (buf, 8, byte_order);
  sparc_collect_rwindow (regcache, sp, regnum);
}


static void
sparc64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

  tdep->gregset = regset_alloc (gdbarch, sparc64obsd_supply_gregset, NULL);
  tdep->sizeof_gregset = 832;

  /* Make sure we can single-step "new" syscalls.  */
  tdep->step_trap = sparcnbsd_step_trap;

  frame_unwind_append_unwinder (gdbarch, &sparc64obsd_frame_unwind);
  frame_unwind_append_unwinder (gdbarch, &sparc64obsd_trapframe_unwind);

  sparc64_init_abi (info, gdbarch);

  /* OpenBSD/sparc64 has SVR4-style shared libraries.  */
  set_solib_svr4_fetch_link_map_offsets
    (gdbarch, svr4_lp64_fetch_link_map_offsets);
  set_gdbarch_skip_solib_resolver (gdbarch, obsd_skip_solib_resolver);

  /* OpenBSD provides a user-level threads implementation.  */
  bsd_uthread_set_supply_uthread (gdbarch, sparc64obsd_supply_uthread);
  bsd_uthread_set_collect_uthread (gdbarch, sparc64obsd_collect_uthread);
}


/* Provide a prototype to silence -Wmissing-prototypes.  */
void _initialize_sparc64obsd_tdep (void);

void
_initialize_sparc64obsd_tdep (void)
{
  gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
                          GDB_OSABI_OPENBSD_ELF, sparc64obsd_init_abi);
}