mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-21 04:42:53 +08:00
1d506c26d9
This commit is the result of the following actions: - Running gdb/copyright.py to update all of the copyright headers to include 2024, - Manually updating a few files the copyright.py script told me to update, these files had copyright headers embedded within the file, - Regenerating gdbsupport/Makefile.in to refresh it's copyright date, - Using grep to find other files that still mentioned 2023. If these files were updated last year from 2022 to 2023 then I've updated them this year to 2024. I'm sure I've probably missed some dates. Feel free to fix them up as you spot them.
520 lines
13 KiB
C
520 lines
13 KiB
C
/* Motorola m68k native support for GNU/Linux.
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Copyright (C) 1996-2024 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 "language.h"
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#include "gdbcore.h"
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#include "regcache.h"
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#include "target.h"
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#include "linux-nat.h"
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#include "gdbarch.h"
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#include "m68k-tdep.h"
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#include <sys/dir.h>
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#include <signal.h>
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#include "nat/gdb_ptrace.h"
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#include <sys/user.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <sys/procfs.h>
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#ifdef HAVE_SYS_REG_H
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#include <sys/reg.h>
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#endif
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#include <sys/file.h>
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#include <sys/stat.h>
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#include "floatformat.h"
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/* Prototypes for supply_gregset etc. */
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#include "gregset.h"
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/* Defines ps_err_e, struct ps_prochandle. */
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#include "gdb_proc_service.h"
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#include "inf-ptrace.h"
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#ifndef PTRACE_GET_THREAD_AREA
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#define PTRACE_GET_THREAD_AREA 25
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#endif
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class m68k_linux_nat_target final : public linux_nat_target
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{
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public:
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/* Add our register access methods. */
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void fetch_registers (struct regcache *, int) override;
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void store_registers (struct regcache *, int) override;
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};
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static m68k_linux_nat_target the_m68k_linux_nat_target;
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/* This table must line up with gdbarch_register_name in "m68k-tdep.c". */
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static const int regmap[] =
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{
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PT_D0, PT_D1, PT_D2, PT_D3, PT_D4, PT_D5, PT_D6, PT_D7,
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PT_A0, PT_A1, PT_A2, PT_A3, PT_A4, PT_A5, PT_A6, PT_USP,
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PT_SR, PT_PC,
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/* PT_FP0, ..., PT_FP7 */
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21, 24, 27, 30, 33, 36, 39, 42,
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/* PT_FPCR, PT_FPSR, PT_FPIAR */
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45, 46, 47
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};
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/* Which ptrace request retrieves which registers?
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These apply to the corresponding SET requests as well. */
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#define NUM_GREGS (18)
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#define MAX_NUM_REGS (NUM_GREGS + 11)
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static int
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getregs_supplies (int regno)
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{
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return 0 <= regno && regno < NUM_GREGS;
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}
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static int
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getfpregs_supplies (int regno)
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{
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return M68K_FP0_REGNUM <= regno && regno <= M68K_FPI_REGNUM;
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}
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/* Does the current host support the GETREGS request? */
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static int have_ptrace_getregs =
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#ifdef HAVE_PTRACE_GETREGS
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1
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#else
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0
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#endif
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;
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/* Fetching registers directly from the U area, one at a time. */
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/* Fetch one register. */
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static void
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fetch_register (struct regcache *regcache, int regno)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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long regaddr, val;
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int i;
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gdb_byte buf[M68K_MAX_REGISTER_SIZE];
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pid_t tid = get_ptrace_pid (regcache->ptid ());
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regaddr = 4 * regmap[regno];
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for (i = 0; i < register_size (gdbarch, regno); i += sizeof (long))
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{
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errno = 0;
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val = ptrace (PTRACE_PEEKUSER, tid, regaddr, 0);
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memcpy (&buf[i], &val, sizeof (long));
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regaddr += sizeof (long);
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if (errno != 0)
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error (_("Couldn't read register %s (#%d): %s."),
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gdbarch_register_name (gdbarch, regno),
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regno, safe_strerror (errno));
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}
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regcache->raw_supply (regno, buf);
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}
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/* Fetch register values from the inferior.
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If REGNO is negative, do this for all registers.
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Otherwise, REGNO specifies which register (so we can save time). */
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static void
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old_fetch_inferior_registers (struct regcache *regcache, int regno)
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{
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if (regno >= 0)
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{
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fetch_register (regcache, regno);
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}
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else
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{
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for (regno = 0;
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regno < gdbarch_num_regs (regcache->arch ());
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regno++)
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{
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fetch_register (regcache, regno);
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}
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}
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}
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/* Store one register. */
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static void
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store_register (const struct regcache *regcache, int regno)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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long regaddr, val;
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int i;
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gdb_byte buf[M68K_MAX_REGISTER_SIZE];
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pid_t tid = get_ptrace_pid (regcache->ptid ());
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regaddr = 4 * regmap[regno];
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/* Put the contents of regno into a local buffer. */
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regcache->raw_collect (regno, buf);
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/* Store the local buffer into the inferior a chunk at the time. */
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for (i = 0; i < register_size (gdbarch, regno); i += sizeof (long))
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{
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errno = 0;
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memcpy (&val, &buf[i], sizeof (long));
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ptrace (PTRACE_POKEUSER, tid, regaddr, val);
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regaddr += sizeof (long);
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if (errno != 0)
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error (_("Couldn't write register %s (#%d): %s."),
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gdbarch_register_name (gdbarch, regno),
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regno, safe_strerror (errno));
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}
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}
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/* Store our register values back into the inferior.
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If REGNO is negative, do this for all registers.
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Otherwise, REGNO specifies which register (so we can save time). */
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static void
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old_store_inferior_registers (const struct regcache *regcache, int regno)
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{
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if (regno >= 0)
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{
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store_register (regcache, regno);
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}
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else
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{
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for (regno = 0;
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regno < gdbarch_num_regs (regcache->arch ());
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regno++)
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{
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store_register (regcache, regno);
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}
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}
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}
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/* Given a pointer to a general register set in /proc format
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(elf_gregset_t *), unpack the register contents and supply
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them as gdb's idea of the current register values. */
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void
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supply_gregset (struct regcache *regcache, const elf_gregset_t *gregsetp)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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const elf_greg_t *regp = (const elf_greg_t *) gregsetp;
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int regi;
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for (regi = M68K_D0_REGNUM;
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regi <= gdbarch_sp_regnum (gdbarch);
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regi++)
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regcache->raw_supply (regi, ®p[regmap[regi]]);
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regcache->raw_supply (gdbarch_ps_regnum (gdbarch), ®p[PT_SR]);
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regcache->raw_supply (gdbarch_pc_regnum (gdbarch), ®p[PT_PC]);
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}
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/* Fill register REGNO (if it is a general-purpose register) in
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*GREGSETPS with the value in GDB's register array. If REGNO is -1,
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do this for all registers. */
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void
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fill_gregset (const struct regcache *regcache,
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elf_gregset_t *gregsetp, int regno)
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{
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elf_greg_t *regp = (elf_greg_t *) gregsetp;
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int i;
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for (i = 0; i < NUM_GREGS; i++)
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if (regno == -1 || regno == i)
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regcache->raw_collect (i, regp + regmap[i]);
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}
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#ifdef HAVE_PTRACE_GETREGS
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/* Fetch all general-purpose registers from process/thread TID and
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store their values in GDB's register array. */
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static void
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fetch_regs (struct regcache *regcache, int tid)
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{
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elf_gregset_t regs;
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if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
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{
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if (errno == EIO)
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{
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/* The kernel we're running on doesn't support the GETREGS
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request. Reset `have_ptrace_getregs'. */
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have_ptrace_getregs = 0;
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return;
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}
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perror_with_name (_("Couldn't get registers"));
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}
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supply_gregset (regcache, (const elf_gregset_t *) ®s);
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}
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/* Store all valid general-purpose registers in GDB's register array
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into the process/thread specified by TID. */
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static void
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store_regs (const struct regcache *regcache, int tid, int regno)
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{
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elf_gregset_t regs;
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if (ptrace (PTRACE_GETREGS, tid, 0, (int) ®s) < 0)
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perror_with_name (_("Couldn't get registers"));
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fill_gregset (regcache, ®s, regno);
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if (ptrace (PTRACE_SETREGS, tid, 0, (int) ®s) < 0)
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perror_with_name (_("Couldn't write registers"));
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}
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#else
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static void fetch_regs (struct regcache *regcache, int tid)
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{
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}
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static void store_regs (const struct regcache *regcache, int tid, int regno)
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{
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}
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#endif
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/* Transfering floating-point registers between GDB, inferiors and cores. */
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/* What is the address of fpN within the floating-point register set F? */
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#define FPREG_ADDR(f, n) (&(f)->fpregs[(n) * 3])
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/* Fill GDB's register array with the floating-point register values in
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*FPREGSETP. */
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void
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supply_fpregset (struct regcache *regcache, const elf_fpregset_t *fpregsetp)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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int regi;
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for (regi = gdbarch_fp0_regnum (gdbarch);
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regi < gdbarch_fp0_regnum (gdbarch) + 8; regi++)
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regcache->raw_supply
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(regi, FPREG_ADDR (fpregsetp, regi - gdbarch_fp0_regnum (gdbarch)));
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regcache->raw_supply (M68K_FPC_REGNUM, &fpregsetp->fpcntl[0]);
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regcache->raw_supply (M68K_FPS_REGNUM, &fpregsetp->fpcntl[1]);
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regcache->raw_supply (M68K_FPI_REGNUM, &fpregsetp->fpcntl[2]);
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}
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/* Fill register REGNO (if it is a floating-point register) in
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*FPREGSETP with the value in GDB's register array. If REGNO is -1,
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do this for all registers. */
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void
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fill_fpregset (const struct regcache *regcache,
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elf_fpregset_t *fpregsetp, int regno)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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int i;
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/* Fill in the floating-point registers. */
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for (i = gdbarch_fp0_regnum (gdbarch);
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i < gdbarch_fp0_regnum (gdbarch) + 8; i++)
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if (regno == -1 || regno == i)
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regcache->raw_collect
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(i, FPREG_ADDR (fpregsetp, i - gdbarch_fp0_regnum (gdbarch)));
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/* Fill in the floating-point control registers. */
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for (i = M68K_FPC_REGNUM; i <= M68K_FPI_REGNUM; i++)
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if (regno == -1 || regno == i)
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regcache->raw_collect (i, &fpregsetp->fpcntl[i - M68K_FPC_REGNUM]);
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}
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#ifdef HAVE_PTRACE_GETREGS
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/* Fetch all floating-point registers from process/thread TID and store
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thier values in GDB's register array. */
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static void
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fetch_fpregs (struct regcache *regcache, int tid)
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{
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elf_fpregset_t fpregs;
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if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
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perror_with_name (_("Couldn't get floating point status"));
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supply_fpregset (regcache, (const elf_fpregset_t *) &fpregs);
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}
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/* Store all valid floating-point registers in GDB's register array
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into the process/thread specified by TID. */
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static void
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store_fpregs (const struct regcache *regcache, int tid, int regno)
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{
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elf_fpregset_t fpregs;
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if (ptrace (PTRACE_GETFPREGS, tid, 0, (int) &fpregs) < 0)
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perror_with_name (_("Couldn't get floating point status"));
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fill_fpregset (regcache, &fpregs, regno);
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if (ptrace (PTRACE_SETFPREGS, tid, 0, (int) &fpregs) < 0)
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perror_with_name (_("Couldn't write floating point status"));
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}
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#else
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static void fetch_fpregs (struct regcache *regcache, int tid)
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{
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}
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static void store_fpregs (const struct regcache *regcache, int tid, int regno)
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{
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}
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#endif
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/* Transferring arbitrary registers between GDB and inferior. */
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/* Fetch register REGNO from the child process. If REGNO is -1, do
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this for all registers (including the floating point and SSE
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registers). */
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void
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m68k_linux_nat_target::fetch_registers (struct regcache *regcache, int regno)
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{
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pid_t tid;
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/* Use the old method of peeking around in `struct user' if the
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GETREGS request isn't available. */
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if (! have_ptrace_getregs)
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{
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old_fetch_inferior_registers (regcache, regno);
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return;
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}
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tid = get_ptrace_pid (regcache->ptid ());
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/* Use the PTRACE_GETFPXREGS request whenever possible, since it
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transfers more registers in one system call, and we'll cache the
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results. But remember that fetch_fpxregs can fail, and return
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zero. */
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if (regno == -1)
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{
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fetch_regs (regcache, tid);
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/* The call above might reset `have_ptrace_getregs'. */
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if (! have_ptrace_getregs)
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{
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old_fetch_inferior_registers (regcache, -1);
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return;
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}
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fetch_fpregs (regcache, tid);
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return;
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}
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if (getregs_supplies (regno))
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{
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fetch_regs (regcache, tid);
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return;
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}
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if (getfpregs_supplies (regno))
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{
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fetch_fpregs (regcache, tid);
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return;
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}
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internal_error (_("Got request for bad register number %d."), regno);
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}
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/* Store register REGNO back into the child process. If REGNO is -1,
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do this for all registers (including the floating point and SSE
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registers). */
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void
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m68k_linux_nat_target::store_registers (struct regcache *regcache, int regno)
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{
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pid_t tid;
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/* Use the old method of poking around in `struct user' if the
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SETREGS request isn't available. */
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if (! have_ptrace_getregs)
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{
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old_store_inferior_registers (regcache, regno);
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return;
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}
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tid = get_ptrace_pid (regcache->ptid ());
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/* Use the PTRACE_SETFPREGS requests whenever possible, since it
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transfers more registers in one system call. But remember that
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store_fpregs can fail, and return zero. */
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if (regno == -1)
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{
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store_regs (regcache, tid, regno);
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store_fpregs (regcache, tid, regno);
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return;
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}
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if (getregs_supplies (regno))
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{
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store_regs (regcache, tid, regno);
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return;
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}
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if (getfpregs_supplies (regno))
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{
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store_fpregs (regcache, tid, regno);
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return;
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}
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internal_error (_("Got request to store bad register number %d."), regno);
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}
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/* Fetch the thread-local storage pointer for libthread_db. */
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ps_err_e
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ps_get_thread_area (struct ps_prochandle *ph,
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lwpid_t lwpid, int idx, void **base)
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{
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if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) < 0)
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return PS_ERR;
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/* IDX is the bias from the thread pointer to the beginning of the
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thread descriptor. It has to be subtracted due to implementation
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quirks in libthread_db. */
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*base = (char *) *base - idx;
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return PS_OK;
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}
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void _initialize_m68k_linux_nat ();
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void
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_initialize_m68k_linux_nat ()
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{
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/* Register the target. */
|
||
linux_target = &the_m68k_linux_nat_target;
|
||
add_inf_child_target (&the_m68k_linux_nat_target);
|
||
}
|