620 lines
17 KiB
C
620 lines
17 KiB
C
/* GNU/Linux on ARM native support.
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Copyright (C) 1999, 2000, 2001, 2002, 2004, 2005, 2006, 2007, 2008, 2009,
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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 "inferior.h"
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#include "gdbcore.h"
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#include "gdb_string.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 "target-descriptions.h"
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#include "arm-tdep.h"
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#include "arm-linux-tdep.h"
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#include <sys/user.h>
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#include <sys/ptrace.h>
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#include <sys/utsname.h>
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#include <sys/procfs.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 "features/arm-with-iwmmxt.c"
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#ifndef PTRACE_GET_THREAD_AREA
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#define PTRACE_GET_THREAD_AREA 22
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#endif
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#ifndef PTRACE_GETWMMXREGS
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#define PTRACE_GETWMMXREGS 18
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#define PTRACE_SETWMMXREGS 19
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#endif
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/* A flag for whether the WMMX registers are available. */
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static int arm_linux_has_wmmx_registers;
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extern int arm_apcs_32;
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/* The following variables are used to determine the version of the
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underlying GNU/Linux operating system. Examples:
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GNU/Linux 2.0.35 GNU/Linux 2.2.12
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os_version = 0x00020023 os_version = 0x0002020c
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os_major = 2 os_major = 2
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os_minor = 0 os_minor = 2
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os_release = 35 os_release = 12
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Note: os_version = (os_major << 16) | (os_minor << 8) | os_release
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These are initialized using get_linux_version() from
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_initialize_arm_linux_nat(). */
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static unsigned int os_version, os_major, os_minor, os_release;
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/* On GNU/Linux, threads are implemented as pseudo-processes, in which
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case we may be tracing more than one process at a time. In that
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case, inferior_ptid will contain the main process ID and the
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individual thread (process) ID. get_thread_id () is used to get
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the thread id if it's available, and the process id otherwise. */
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int
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get_thread_id (ptid_t ptid)
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{
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int tid = TIDGET (ptid);
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if (0 == tid)
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tid = PIDGET (ptid);
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return tid;
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}
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#define GET_THREAD_ID(PTID) get_thread_id (PTID)
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/* Get the value of a particular register from the floating point
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state of the process and store it into regcache. */
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static void
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fetch_fpregister (struct regcache *regcache, int regno)
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{
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int ret, tid;
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gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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/* Read the floating point state. */
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ret = ptrace (PT_GETFPREGS, tid, 0, fp);
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if (ret < 0)
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{
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warning (_("Unable to fetch floating point register."));
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return;
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}
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/* Fetch fpsr. */
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if (ARM_FPS_REGNUM == regno)
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regcache_raw_supply (regcache, ARM_FPS_REGNUM,
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fp + NWFPE_FPSR_OFFSET);
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/* Fetch the floating point register. */
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if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM)
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supply_nwfpe_register (regcache, regno, fp);
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}
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/* Get the whole floating point state of the process and store it
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into regcache. */
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static void
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fetch_fpregs (struct regcache *regcache)
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{
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int ret, regno, tid;
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gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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/* Read the floating point state. */
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ret = ptrace (PT_GETFPREGS, tid, 0, fp);
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if (ret < 0)
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{
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warning (_("Unable to fetch the floating point registers."));
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return;
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}
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/* Fetch fpsr. */
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regcache_raw_supply (regcache, ARM_FPS_REGNUM,
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fp + NWFPE_FPSR_OFFSET);
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/* Fetch the floating point registers. */
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for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
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supply_nwfpe_register (regcache, regno, fp);
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}
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/* Save a particular register into the floating point state of the
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process using the contents from regcache. */
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static void
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store_fpregister (const struct regcache *regcache, int regno)
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{
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int ret, tid;
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gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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/* Read the floating point state. */
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ret = ptrace (PT_GETFPREGS, tid, 0, fp);
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if (ret < 0)
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{
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warning (_("Unable to fetch the floating point registers."));
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return;
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}
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/* Store fpsr. */
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if (ARM_FPS_REGNUM == regno && regcache_valid_p (regcache, ARM_FPS_REGNUM))
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regcache_raw_collect (regcache, ARM_FPS_REGNUM, fp + NWFPE_FPSR_OFFSET);
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/* Store the floating point register. */
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if (regno >= ARM_F0_REGNUM && regno <= ARM_F7_REGNUM)
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collect_nwfpe_register (regcache, regno, fp);
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ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp);
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if (ret < 0)
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{
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warning (_("Unable to store floating point register."));
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return;
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}
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}
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/* Save the whole floating point state of the process using
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the contents from regcache. */
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static void
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store_fpregs (const struct regcache *regcache)
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{
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int ret, regno, tid;
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gdb_byte fp[ARM_LINUX_SIZEOF_NWFPE];
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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/* Read the floating point state. */
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ret = ptrace (PT_GETFPREGS, tid, 0, fp);
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if (ret < 0)
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{
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warning (_("Unable to fetch the floating point registers."));
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return;
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}
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/* Store fpsr. */
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if (regcache_valid_p (regcache, ARM_FPS_REGNUM))
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regcache_raw_collect (regcache, ARM_FPS_REGNUM, fp + NWFPE_FPSR_OFFSET);
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/* Store the floating point registers. */
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for (regno = ARM_F0_REGNUM; regno <= ARM_F7_REGNUM; regno++)
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if (regcache_valid_p (regcache, regno))
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collect_nwfpe_register (regcache, regno, fp);
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ret = ptrace (PTRACE_SETFPREGS, tid, 0, fp);
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if (ret < 0)
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{
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warning (_("Unable to store floating point registers."));
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return;
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}
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}
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/* Fetch a general register of the process and store into
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regcache. */
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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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int ret, tid;
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elf_gregset_t regs;
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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ret = ptrace (PTRACE_GETREGS, tid, 0, ®s);
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if (ret < 0)
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{
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warning (_("Unable to fetch general register."));
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return;
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}
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if (regno >= ARM_A1_REGNUM && regno < ARM_PC_REGNUM)
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regcache_raw_supply (regcache, regno, (char *) ®s[regno]);
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if (ARM_PS_REGNUM == regno)
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{
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if (arm_apcs_32)
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regcache_raw_supply (regcache, ARM_PS_REGNUM,
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(char *) ®s[ARM_CPSR_GREGNUM]);
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else
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regcache_raw_supply (regcache, ARM_PS_REGNUM,
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(char *) ®s[ARM_PC_REGNUM]);
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}
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if (ARM_PC_REGNUM == regno)
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{
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regs[ARM_PC_REGNUM] = gdbarch_addr_bits_remove
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(get_regcache_arch (regcache),
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regs[ARM_PC_REGNUM]);
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regcache_raw_supply (regcache, ARM_PC_REGNUM,
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(char *) ®s[ARM_PC_REGNUM]);
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}
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}
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/* Fetch all general registers of the process and store into
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regcache. */
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static void
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fetch_regs (struct regcache *regcache)
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{
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int ret, regno, tid;
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elf_gregset_t regs;
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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ret = ptrace (PTRACE_GETREGS, tid, 0, ®s);
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if (ret < 0)
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{
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warning (_("Unable to fetch general registers."));
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return;
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}
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for (regno = ARM_A1_REGNUM; regno < ARM_PC_REGNUM; regno++)
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regcache_raw_supply (regcache, regno, (char *) ®s[regno]);
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if (arm_apcs_32)
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regcache_raw_supply (regcache, ARM_PS_REGNUM,
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(char *) ®s[ARM_CPSR_GREGNUM]);
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else
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regcache_raw_supply (regcache, ARM_PS_REGNUM,
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(char *) ®s[ARM_PC_REGNUM]);
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regs[ARM_PC_REGNUM] = gdbarch_addr_bits_remove
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(get_regcache_arch (regcache), regs[ARM_PC_REGNUM]);
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regcache_raw_supply (regcache, ARM_PC_REGNUM,
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(char *) ®s[ARM_PC_REGNUM]);
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}
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/* Store all general registers of the process from the values in
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regcache. */
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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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int ret, tid;
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elf_gregset_t regs;
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if (!regcache_valid_p (regcache, regno))
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return;
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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/* Get the general registers from the process. */
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ret = ptrace (PTRACE_GETREGS, tid, 0, ®s);
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if (ret < 0)
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{
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warning (_("Unable to fetch general registers."));
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return;
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}
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if (regno >= ARM_A1_REGNUM && regno <= ARM_PC_REGNUM)
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regcache_raw_collect (regcache, regno, (char *) ®s[regno]);
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else if (arm_apcs_32 && regno == ARM_PS_REGNUM)
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regcache_raw_collect (regcache, regno,
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(char *) ®s[ARM_CPSR_GREGNUM]);
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else if (!arm_apcs_32 && regno == ARM_PS_REGNUM)
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regcache_raw_collect (regcache, ARM_PC_REGNUM,
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(char *) ®s[ARM_PC_REGNUM]);
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ret = ptrace (PTRACE_SETREGS, tid, 0, ®s);
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if (ret < 0)
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{
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warning (_("Unable to store general register."));
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return;
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}
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}
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static void
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store_regs (const struct regcache *regcache)
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{
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int ret, regno, tid;
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elf_gregset_t regs;
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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/* Fetch the general registers. */
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ret = ptrace (PTRACE_GETREGS, tid, 0, ®s);
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if (ret < 0)
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{
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warning (_("Unable to fetch general registers."));
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return;
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}
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for (regno = ARM_A1_REGNUM; regno <= ARM_PC_REGNUM; regno++)
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{
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if (regcache_valid_p (regcache, regno))
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regcache_raw_collect (regcache, regno, (char *) ®s[regno]);
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}
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if (arm_apcs_32 && regcache_valid_p (regcache, ARM_PS_REGNUM))
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regcache_raw_collect (regcache, ARM_PS_REGNUM,
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(char *) ®s[ARM_CPSR_GREGNUM]);
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ret = ptrace (PTRACE_SETREGS, tid, 0, ®s);
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if (ret < 0)
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{
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warning (_("Unable to store general registers."));
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return;
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}
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}
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/* Fetch all WMMX registers of the process and store into
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regcache. */
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#define IWMMXT_REGS_SIZE (16 * 8 + 6 * 4)
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static void
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fetch_wmmx_regs (struct regcache *regcache)
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{
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char regbuf[IWMMXT_REGS_SIZE];
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int ret, regno, tid;
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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ret = ptrace (PTRACE_GETWMMXREGS, tid, 0, regbuf);
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if (ret < 0)
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{
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warning (_("Unable to fetch WMMX registers."));
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return;
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}
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for (regno = 0; regno < 16; regno++)
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regcache_raw_supply (regcache, regno + ARM_WR0_REGNUM,
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®buf[regno * 8]);
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for (regno = 0; regno < 2; regno++)
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regcache_raw_supply (regcache, regno + ARM_WCSSF_REGNUM,
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®buf[16 * 8 + regno * 4]);
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for (regno = 0; regno < 4; regno++)
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regcache_raw_supply (regcache, regno + ARM_WCGR0_REGNUM,
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®buf[16 * 8 + 2 * 4 + regno * 4]);
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}
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static void
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store_wmmx_regs (const struct regcache *regcache)
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{
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char regbuf[IWMMXT_REGS_SIZE];
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int ret, regno, tid;
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/* Get the thread id for the ptrace call. */
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tid = GET_THREAD_ID (inferior_ptid);
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ret = ptrace (PTRACE_GETWMMXREGS, tid, 0, regbuf);
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if (ret < 0)
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{
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warning (_("Unable to fetch WMMX registers."));
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return;
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}
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for (regno = 0; regno < 16; regno++)
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if (regcache_valid_p (regcache, regno + ARM_WR0_REGNUM))
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regcache_raw_collect (regcache, regno + ARM_WR0_REGNUM,
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®buf[regno * 8]);
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for (regno = 0; regno < 2; regno++)
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if (regcache_valid_p (regcache, regno + ARM_WCSSF_REGNUM))
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regcache_raw_collect (regcache, regno + ARM_WCSSF_REGNUM,
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®buf[16 * 8 + regno * 4]);
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for (regno = 0; regno < 4; regno++)
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if (regcache_valid_p (regcache, regno + ARM_WCGR0_REGNUM))
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regcache_raw_collect (regcache, regno + ARM_WCGR0_REGNUM,
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®buf[16 * 8 + 2 * 4 + regno * 4]);
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ret = ptrace (PTRACE_SETWMMXREGS, tid, 0, regbuf);
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if (ret < 0)
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{
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warning (_("Unable to store WMMX registers."));
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return;
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}
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}
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/* Fetch registers from the child process. Fetch all registers if
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regno == -1, otherwise fetch all general registers or all floating
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point registers depending upon the value of regno. */
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static void
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arm_linux_fetch_inferior_registers (struct target_ops *ops,
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struct regcache *regcache, int regno)
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{
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if (-1 == regno)
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{
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fetch_regs (regcache);
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fetch_fpregs (regcache);
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if (arm_linux_has_wmmx_registers)
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fetch_wmmx_regs (regcache);
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}
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else
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{
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if (regno < ARM_F0_REGNUM || regno == ARM_PS_REGNUM)
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fetch_register (regcache, regno);
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else if (regno >= ARM_F0_REGNUM && regno <= ARM_FPS_REGNUM)
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fetch_fpregister (regcache, regno);
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else if (arm_linux_has_wmmx_registers
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&& regno >= ARM_WR0_REGNUM && regno <= ARM_WCGR7_REGNUM)
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fetch_wmmx_regs (regcache);
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}
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}
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/* Store registers back into the inferior. Store all registers if
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regno == -1, otherwise store all general registers or all floating
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point registers depending upon the value of regno. */
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static void
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arm_linux_store_inferior_registers (struct target_ops *ops,
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struct regcache *regcache, int regno)
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{
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if (-1 == regno)
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{
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store_regs (regcache);
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store_fpregs (regcache);
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if (arm_linux_has_wmmx_registers)
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store_wmmx_regs (regcache);
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}
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else
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{
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if (regno < ARM_F0_REGNUM || regno == ARM_PS_REGNUM)
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store_register (regcache, regno);
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else if ((regno >= ARM_F0_REGNUM) && (regno <= ARM_FPS_REGNUM))
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store_fpregister (regcache, regno);
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else if (arm_linux_has_wmmx_registers
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&& regno >= ARM_WR0_REGNUM && regno <= ARM_WCGR7_REGNUM)
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store_wmmx_regs (regcache);
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}
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}
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/* Wrapper functions for the standard regset handling, used by
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thread debugging. */
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void
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fill_gregset (const struct regcache *regcache,
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gdb_gregset_t *gregsetp, int regno)
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{
|
|
arm_linux_collect_gregset (NULL, regcache, regno, gregsetp, 0);
|
|
}
|
|
|
|
void
|
|
supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
|
|
{
|
|
arm_linux_supply_gregset (NULL, regcache, -1, gregsetp, 0);
|
|
}
|
|
|
|
void
|
|
fill_fpregset (const struct regcache *regcache,
|
|
gdb_fpregset_t *fpregsetp, int regno)
|
|
{
|
|
arm_linux_collect_nwfpe (NULL, regcache, regno, fpregsetp, 0);
|
|
}
|
|
|
|
/* Fill GDB's register array with the floating-point register values
|
|
in *fpregsetp. */
|
|
|
|
void
|
|
supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp)
|
|
{
|
|
arm_linux_supply_nwfpe (NULL, regcache, -1, fpregsetp, 0);
|
|
}
|
|
|
|
/* Fetch the thread-local storage pointer for libthread_db. */
|
|
|
|
ps_err_e
|
|
ps_get_thread_area (const struct ps_prochandle *ph,
|
|
lwpid_t lwpid, int idx, void **base)
|
|
{
|
|
if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
|
|
return PS_ERR;
|
|
|
|
/* IDX is the bias from the thread pointer to the beginning of the
|
|
thread descriptor. It has to be subtracted due to implementation
|
|
quirks in libthread_db. */
|
|
*base = (void *) ((char *)*base - idx);
|
|
|
|
return PS_OK;
|
|
}
|
|
|
|
static unsigned int
|
|
get_linux_version (unsigned int *vmajor,
|
|
unsigned int *vminor,
|
|
unsigned int *vrelease)
|
|
{
|
|
struct utsname info;
|
|
char *pmajor, *pminor, *prelease, *tail;
|
|
|
|
if (-1 == uname (&info))
|
|
{
|
|
warning (_("Unable to determine GNU/Linux version."));
|
|
return -1;
|
|
}
|
|
|
|
pmajor = strtok (info.release, ".");
|
|
pminor = strtok (NULL, ".");
|
|
prelease = strtok (NULL, ".");
|
|
|
|
*vmajor = (unsigned int) strtoul (pmajor, &tail, 0);
|
|
*vminor = (unsigned int) strtoul (pminor, &tail, 0);
|
|
*vrelease = (unsigned int) strtoul (prelease, &tail, 0);
|
|
|
|
return ((*vmajor << 16) | (*vminor << 8) | *vrelease);
|
|
}
|
|
|
|
static const struct target_desc *
|
|
arm_linux_read_description (struct target_ops *ops)
|
|
{
|
|
int ret;
|
|
char regbuf[IWMMXT_REGS_SIZE];
|
|
|
|
ret = ptrace (PTRACE_GETWMMXREGS, GET_THREAD_ID (inferior_ptid),
|
|
0, regbuf);
|
|
if (ret < 0)
|
|
arm_linux_has_wmmx_registers = 0;
|
|
else
|
|
arm_linux_has_wmmx_registers = 1;
|
|
|
|
if (arm_linux_has_wmmx_registers)
|
|
return tdesc_arm_with_iwmmxt;
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
void _initialize_arm_linux_nat (void);
|
|
|
|
void
|
|
_initialize_arm_linux_nat (void)
|
|
{
|
|
struct target_ops *t;
|
|
|
|
os_version = get_linux_version (&os_major, &os_minor, &os_release);
|
|
|
|
/* Fill in the generic GNU/Linux methods. */
|
|
t = linux_target ();
|
|
|
|
/* Add our register access methods. */
|
|
t->to_fetch_registers = arm_linux_fetch_inferior_registers;
|
|
t->to_store_registers = arm_linux_store_inferior_registers;
|
|
|
|
t->to_read_description = arm_linux_read_description;
|
|
|
|
/* Register the target. */
|
|
linux_nat_add_target (t);
|
|
|
|
/* Initialize the standard target descriptions. */
|
|
initialize_tdesc_arm_with_iwmmxt ();
|
|
}
|