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[/] [openrisc/] [trunk/] [gnu-old/] [gdb-7.1/] [gdb/] [microblaze-linux-tdep.c] - Blame information for rev 834

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Line No. Rev Author Line
1 227 jeremybenn
/* Target-dependent code for Xilinx MicroBlaze.
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   Copyright 2009, 2010 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 "inferior.h"
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#include "symtab.h"
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#include "target.h"
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#include "gdbcore.h"
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#include "gdbcmd.h"
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#include "symfile.h"
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#include "objfiles.h"
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#include "regcache.h"
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#include "value.h"
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#include "osabi.h"
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#include "regset.h"
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#include "solib-svr4.h"
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#include "microblaze-tdep.h"
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#include "trad-frame.h"
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#include "frame-unwind.h"
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#include "tramp-frame.h"
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static int
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microblaze_linux_memory_remove_breakpoint (struct gdbarch *gdbarch,
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                                           struct bp_target_info *bp_tgt)
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{
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  CORE_ADDR addr = bp_tgt->placed_address;
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  const gdb_byte *bp;
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  int val;
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  int bplen;
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  gdb_byte old_contents[BREAKPOINT_MAX];
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  /* Determine appropriate breakpoint contents and size for this address.  */
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  bp = gdbarch_breakpoint_from_pc (gdbarch, &addr, &bplen);
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  if (bp == NULL)
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    error (_("Software breakpoints not implemented for this target."));
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  val = target_read_memory (addr, old_contents, bplen);
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  /* If our breakpoint is no longer at the address, this means that the
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     program modified the code on us, so it is wrong to put back the
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     old value.  */
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  if (val == 0 && memcmp (bp, old_contents, bplen) == 0)
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    val = target_write_memory (addr, bp_tgt->shadow_contents, bplen);
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  return val;
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}
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static void
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microblaze_linux_sigtramp_cache (struct frame_info *next_frame,
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                                 struct trad_frame_cache *this_cache,
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                                 CORE_ADDR func, LONGEST offset,
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                                 int bias)
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{
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  CORE_ADDR base;
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  CORE_ADDR gpregs;
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  int regnum;
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  struct gdbarch *gdbarch = get_frame_arch (next_frame);
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  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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  base = frame_unwind_register_unsigned (next_frame, MICROBLAZE_SP_REGNUM);
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  if (bias > 0 && get_frame_address_in_block (next_frame) != func)
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    /* See below, some signal trampolines increment the stack as their
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       first instruction, need to compensate for that.  */
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    base -= bias;
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  /* Find the address of the register buffer.  */
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  gpregs = base + offset;
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  /* Registers saved on stack.  */
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  for (regnum = 0; regnum < MICROBLAZE_BTR_REGNUM; regnum++)
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    trad_frame_set_reg_addr (this_cache, regnum,
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                             gpregs + regnum * MICROBLAZE_REGISTER_SIZE);
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  trad_frame_set_id (this_cache, frame_id_build (base, func));
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}
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static void
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microblaze_linux_sighandler_cache_init (const struct tramp_frame *self,
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                                        struct frame_info *next_frame,
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                                        struct trad_frame_cache *this_cache,
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                                        CORE_ADDR func)
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{
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  microblaze_linux_sigtramp_cache (next_frame, this_cache, func,
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                                   + 24 /* Offset to .reg.  */,
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                                   0);
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}
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static struct tramp_frame microblaze_linux_sighandler_tramp_frame =
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{
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  SIGTRAMP_FRAME,
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  4,
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  {
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    { 0x31800077, -1 }, /* addik R12,R0,119.  */
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    { 0xb9cc0008, -1 }, /* brki R14,8.  */
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    { TRAMP_SENTINEL_INSN },
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  },
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  microblaze_linux_sighandler_cache_init
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};
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static void
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microblaze_linux_init_abi (struct gdbarch_info info,
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                           struct gdbarch *gdbarch)
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{
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  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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  set_gdbarch_memory_remove_breakpoint (gdbarch,
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                                        microblaze_linux_memory_remove_breakpoint);
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  /* Shared library handling.  */
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  set_solib_svr4_fetch_link_map_offsets (gdbarch,
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                                         svr4_ilp32_fetch_link_map_offsets);
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  /* Trampolines.  */
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  tramp_frame_prepend_unwinder (gdbarch,
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                                &microblaze_linux_sighandler_tramp_frame);
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}
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void
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_initialize_microblaze_linux_tdep (void)
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{
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  gdbarch_register_osabi (bfd_arch_microblaze, 0, GDB_OSABI_LINUX,
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                          microblaze_linux_init_abi);
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}

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