/* Native-dependent code for GNU/Linux on MIPS processors.
- Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
+ Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
+ Free Software Foundation, Inc.
This file is part of GDB.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
#include "defs.h"
+#include "inferior.h"
#include "mips-tdep.h"
+#include "target.h"
+#include "linux-nat.h"
+#include "mips-linux-tdep.h"
+
+#include "gdb_proc_service.h"
+
+#include <sys/ptrace.h>
+
+#ifndef PTRACE_GET_THREAD_AREA
+#define PTRACE_GET_THREAD_AREA 25
+#endif
+
+/* Assume that we have PTRACE_GETREGS et al. support. If we do not,
+ we'll clear this and use PTRACE_PEEKUSER instead. */
+static int have_ptrace_regsets = 1;
+
+/* Saved function pointers to fetch and store a single register using
+ PTRACE_PEEKUSER and PTRACE_POKEUSER. */
+
+void (*super_fetch_registers) (int);
+void (*super_store_registers) (int);
/* Pseudo registers can not be read. ptrace does not provide a way to
read (or set) MIPS_PS_REGNUM, and there's no point in reading or
else
return 1;
}
+
+/* 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;
+}
+
+/* Fetch REGNO (or all registers if REGNO == -1) from the target
+ using PTRACE_GETREGS et al. */
+
+static void
+mips64_linux_regsets_fetch_registers (int regno)
+{
+ int is_fp;
+ int tid;
+
+ if (regno >= mips_regnum (current_gdbarch)->fp0
+ && regno <= mips_regnum (current_gdbarch)->fp0 + 32)
+ is_fp = 1;
+ else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
+ is_fp = 1;
+ else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
+ is_fp = 1;
+ else
+ is_fp = 0;
+
+ tid = ptid_get_lwp (inferior_ptid);
+ if (tid == 0)
+ tid = ptid_get_pid (inferior_ptid);
+
+ if (regno == -1 || !is_fp)
+ {
+ mips64_elf_gregset_t regs;
+
+ if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
+ {
+ if (errno == EIO)
+ {
+ have_ptrace_regsets = 0;
+ return;
+ }
+ perror_with_name (_("Couldn't get registers"));
+ }
+
+ mips64_supply_gregset (®s);
+ }
+
+ if (regno == -1 || is_fp)
+ {
+ mips64_elf_fpregset_t fp_regs;
+
+ if (ptrace (PTRACE_GETFPREGS, tid, 0L,
+ (PTRACE_TYPE_ARG3) &fp_regs) == -1)
+ {
+ if (errno == EIO)
+ {
+ have_ptrace_regsets = 0;
+ return;
+ }
+ perror_with_name (_("Couldn't get FP registers"));
+ }
+
+ mips64_supply_fpregset (&fp_regs);
+ }
+}
+
+/* Store REGNO (or all registers if REGNO == -1) to the target
+ using PTRACE_SETREGS et al. */
+
+static void
+mips64_linux_regsets_store_registers (int regno)
+{
+ int is_fp;
+ int tid;
+
+ if (regno >= mips_regnum (current_gdbarch)->fp0
+ && regno <= mips_regnum (current_gdbarch)->fp0 + 32)
+ is_fp = 1;
+ else if (regno == mips_regnum (current_gdbarch)->fp_control_status)
+ is_fp = 1;
+ else if (regno == mips_regnum (current_gdbarch)->fp_implementation_revision)
+ is_fp = 1;
+ else
+ is_fp = 0;
+
+ tid = ptid_get_lwp (inferior_ptid);
+ if (tid == 0)
+ tid = ptid_get_pid (inferior_ptid);
+
+ if (regno == -1 || !is_fp)
+ {
+ mips64_elf_gregset_t regs;
+
+ if (ptrace (PTRACE_GETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
+ perror_with_name (_("Couldn't get registers"));
+
+ mips64_fill_gregset (®s, regno);
+
+ if (ptrace (PTRACE_SETREGS, tid, 0L, (PTRACE_TYPE_ARG3) ®s) == -1)
+ perror_with_name (_("Couldn't set registers"));
+ }
+
+ if (regno == -1 || is_fp)
+ {
+ mips64_elf_fpregset_t fp_regs;
+
+ if (ptrace (PTRACE_GETFPREGS, tid, 0L,
+ (PTRACE_TYPE_ARG3) &fp_regs) == -1)
+ perror_with_name (_("Couldn't get FP registers"));
+
+ mips64_fill_fpregset (&fp_regs, regno);
+
+ if (ptrace (PTRACE_SETFPREGS, tid, 0L,
+ (PTRACE_TYPE_ARG3) &fp_regs) == -1)
+ perror_with_name (_("Couldn't set FP registers"));
+ }
+}
+
+/* Fetch REGNO (or all registers if REGNO == -1) from the target
+ using any working method. */
+
+static void
+mips64_linux_fetch_registers (int regnum)
+{
+ /* Unless we already know that PTRACE_GETREGS does not work, try it. */
+ if (have_ptrace_regsets)
+ mips64_linux_regsets_fetch_registers (regnum);
+
+ /* If we know, or just found out, that PTRACE_GETREGS does not work, fall
+ back to PTRACE_PEEKUSER. */
+ if (!have_ptrace_regsets)
+ super_fetch_registers (regnum);
+}
+
+/* Store REGNO (or all registers if REGNO == -1) to the target
+ using any working method. */
+
+static void
+mips64_linux_store_registers (int regnum)
+{
+ /* Unless we already know that PTRACE_GETREGS does not work, try it. */
+ if (have_ptrace_regsets)
+ mips64_linux_regsets_store_registers (regnum);
+
+ /* If we know, or just found out, that PTRACE_GETREGS does not work, fall
+ back to PTRACE_PEEKUSER. */
+ if (!have_ptrace_regsets)
+ super_store_registers (regnum);
+}
+
+void _initialize_mips_linux_nat (void);
+
+void
+_initialize_mips_linux_nat (void)
+{
+ struct target_ops *t = linux_target ();
+
+ super_fetch_registers = t->to_fetch_registers;
+ super_store_registers = t->to_store_registers;
+
+ t->to_fetch_registers = mips64_linux_fetch_registers;
+ t->to_store_registers = mips64_linux_store_registers;
+
+ linux_nat_add_target (t);
+}
projects / thirdparty / binutils-gdb.git / blobdiff