+/* Fetch register REGNUM from the inferior. */
+
+static void
+ia64_linux_fetch_register (struct regcache *regcache, int regnum)
+{
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ CORE_ADDR addr;
+ size_t size;
+ PTRACE_TYPE_RET *buf;
+ int pid, i;
+
+ /* r0 cannot be fetched but is always zero. */
+ if (regnum == IA64_GR0_REGNUM)
+ {
+ const gdb_byte zero[8] = { 0 };
+
+ gdb_assert (sizeof (zero) == register_size (gdbarch, regnum));
+ regcache_raw_supply (regcache, regnum, zero);
+ return;
+ }
+
+ /* fr0 cannot be fetched but is always zero. */
+ if (regnum == IA64_FR0_REGNUM)
+ {
+ const gdb_byte f_zero[16] = { 0 };
+
+ gdb_assert (sizeof (f_zero) == register_size (gdbarch, regnum));
+ regcache_raw_supply (regcache, regnum, f_zero);
+ return;
+ }
+
+ /* fr1 cannot be fetched but is always one (1.0). */
+ if (regnum == IA64_FR1_REGNUM)
+ {
+ const gdb_byte f_one[16] =
+ { 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0xff, 0, 0, 0, 0, 0, 0 };
+
+ gdb_assert (sizeof (f_one) == register_size (gdbarch, regnum));
+ regcache_raw_supply (regcache, regnum, f_one);
+ return;
+ }
+
+ if (ia64_cannot_fetch_register (gdbarch, regnum))
+ {
+ regcache_raw_supply (regcache, regnum, NULL);
+ return;
+ }
+
+ /* Cater for systems like GNU/Linux, that implement threads as
+ separate processes. */
+ pid = ptid_get_lwp (inferior_ptid);
+ if (pid == 0)
+ pid = ptid_get_pid (inferior_ptid);
+
+ /* This isn't really an address, but ptrace thinks of it as one. */
+ addr = ia64_register_addr (gdbarch, regnum);
+ size = register_size (gdbarch, regnum);
+
+ gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0);
+ buf = alloca (size);
+
+ /* Read the register contents from the inferior a chunk at a time. */
+ for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
+ {
+ errno = 0;
+ buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3)addr, 0);
+ if (errno != 0)
+ error (_("Couldn't read register %s (#%d): %s."),
+ gdbarch_register_name (gdbarch, regnum),
+ regnum, safe_strerror (errno));
+
+ addr += sizeof (PTRACE_TYPE_RET);
+ }
+ regcache_raw_supply (regcache, regnum, buf);
+}
+
+/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
+ for all registers. */
+
+static void
+ia64_linux_fetch_registers (struct target_ops *ops,
+ struct regcache *regcache, int regnum)
+{
+ if (regnum == -1)
+ for (regnum = 0;
+ regnum < gdbarch_num_regs (get_regcache_arch (regcache));
+ regnum++)
+ ia64_linux_fetch_register (regcache, regnum);
+ else
+ ia64_linux_fetch_register (regcache, regnum);
+}
+
+/* Store register REGNUM into the inferior. */
+
+static void
+ia64_linux_store_register (const struct regcache *regcache, int regnum)
+{
+ struct gdbarch *gdbarch = get_regcache_arch (regcache);
+ CORE_ADDR addr;
+ size_t size;
+ PTRACE_TYPE_RET *buf;
+ int pid, i;
+
+ if (ia64_cannot_store_register (gdbarch, regnum))
+ return;
+
+ /* Cater for systems like GNU/Linux, that implement threads as
+ separate processes. */
+ pid = ptid_get_lwp (inferior_ptid);
+ if (pid == 0)
+ pid = ptid_get_pid (inferior_ptid);
+
+ /* This isn't really an address, but ptrace thinks of it as one. */
+ addr = ia64_register_addr (gdbarch, regnum);
+ size = register_size (gdbarch, regnum);
+
+ gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0);
+ buf = alloca (size);
+
+ /* Write the register contents into the inferior a chunk at a time. */
+ regcache_raw_collect (regcache, regnum, buf);
+ for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
+ {
+ errno = 0;
+ ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3)addr, buf[i]);
+ if (errno != 0)
+ error (_("Couldn't write register %s (#%d): %s."),
+ gdbarch_register_name (gdbarch, regnum),
+ regnum, safe_strerror (errno));
+
+ addr += sizeof (PTRACE_TYPE_RET);
+ }
+}
+
+/* Store register REGNUM back into the inferior. If REGNUM is -1, do
+ this for all registers. */
+
+static void
+ia64_linux_store_registers (struct target_ops *ops,
+ struct regcache *regcache, int regnum)
+{
+ if (regnum == -1)
+ for (regnum = 0;
+ regnum < gdbarch_num_regs (get_regcache_arch (regcache));
+ regnum++)
+ ia64_linux_store_register (regcache, regnum);
+ else
+ ia64_linux_store_register (regcache, regnum);
+}
+
+
+static target_xfer_partial_ftype *super_xfer_partial;
+
+/* Implement the to_xfer_partial target_ops method. */
+
+static enum target_xfer_status