Make inf_ptrace_trad Linux-only, move to separate file

There are only two inf_ptrace_trad_target users, MIPS GNU/Linux and
Alpha GNU/Linux.  They both call it via linux_trad_target.

Move this code out of inf-ptrace.c to a GNU/Linux-specific new file.

Making this code be GNU/Linux-specific simplifies C++ification of
target_ops, because we can make the trad target inherit linux_nat
instead of inheriting inf_ptrace.  That'll be visible in a later patch.

Note this makes linux_target_install_ops an extern function, but that
is temporary -- the function will disappear once target_ops is made a
C++ class with virtual methods, later in the series.  Also, I did not
rename the functions in the new file for a similar reason.  They'll be
renamed again anyway in a couple of patches.

gdb/ChangeLog:
2018-05-02  Pedro Alves  <palves@redhat.com>

	* alpha-linux-nat.c: Include "linux-nat-trad.h" instead of
	"linux-nat.h".
	* configure.nat (alpha-linux, linux-mips): Add linux-nat-trad.o.
	* inf-ptrace.c (inf_ptrace_register_u_offset)
	(inf_ptrace_fetch_register, inf_ptrace_fetch_registers)
	(inf_ptrace_store_register, inf_ptrace_store_registers)
	(inf_ptrace_trad_target): Move to ...
	* linux-nat-trad.c: ... this new file.
	* linux-nat-trad.h: New file.
	* linux-nat.c (linux_target_install_ops): Make extern.
	(linux_trad_target): Delete.
	* linux-nat.h (linux_trad_target): Delete declaration.
	(linux_target_install_ops): Declare.
	* mips-linux-nat.c: Include "linux-nat-trad.h" instead of
	"linux-nat.h".

1 files changed, 0 insertions, 135 deletions

diff --git a/gdb/inf-ptrace.c b/gdb/inf-ptrace.c
index 942494b..1fd41bf 100644
--- a/gdb/inf-ptrace.c
+++ b/gdb/inf-ptrace.c
@@ -702,138 +702,3 @@ inf_ptrace_target (void)
   return t;
 }
 
-
-/* Pointer to a function that returns the offset within the user area
-   where a particular register is stored.  */
-static CORE_ADDR (*inf_ptrace_register_u_offset)(struct gdbarch *, int, int);
-
-/* Fetch register REGNUM from the inferior.  */
-
-static void
-inf_ptrace_fetch_register (struct regcache *regcache, int regnum)
-{
-  struct gdbarch *gdbarch = regcache->arch ();
-  CORE_ADDR addr;
-  size_t size;
-  PTRACE_TYPE_RET *buf;
-  pid_t pid;
-  int i;
-
-  /* This isn't really an address, but ptrace thinks of it as one.  */
-  addr = inf_ptrace_register_u_offset (gdbarch, regnum, 0);
-  if (addr == (CORE_ADDR)-1
-      || gdbarch_cannot_fetch_register (gdbarch, regnum))
-    {
-      regcache_raw_supply (regcache, regnum, NULL);
-      return;
-    }
-
-  pid = get_ptrace_pid (regcache_get_ptid (regcache));
-
-  size = register_size (gdbarch, regnum);
-  gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0);
-  buf = (PTRACE_TYPE_RET *) 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)(uintptr_t)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
-inf_ptrace_fetch_registers (struct target_ops *ops,
-			    struct regcache *regcache, int regnum)
-{
-  if (regnum == -1)
-    for (regnum = 0;
-	 regnum < gdbarch_num_regs (regcache->arch ());
-	 regnum++)
-      inf_ptrace_fetch_register (regcache, regnum);
-  else
-    inf_ptrace_fetch_register (regcache, regnum);
-}
-
-/* Store register REGNUM into the inferior.  */
-
-static void
-inf_ptrace_store_register (const struct regcache *regcache, int regnum)
-{
-  struct gdbarch *gdbarch = regcache->arch ();
-  CORE_ADDR addr;
-  size_t size;
-  PTRACE_TYPE_RET *buf;
-  pid_t pid;
-  int i;
-
-  /* This isn't really an address, but ptrace thinks of it as one.  */
-  addr = inf_ptrace_register_u_offset (gdbarch, regnum, 1);
-  if (addr == (CORE_ADDR)-1 
-      || gdbarch_cannot_store_register (gdbarch, regnum))
-    return;
-
-  pid = get_ptrace_pid (regcache_get_ptid (regcache));
-
-  size = register_size (gdbarch, regnum);
-  gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0);
-  buf = (PTRACE_TYPE_RET *) 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)(uintptr_t)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
-inf_ptrace_store_registers (struct target_ops *ops,
-			    struct regcache *regcache, int regnum)
-{
-  if (regnum == -1)
-    for (regnum = 0;
-	 regnum < gdbarch_num_regs (regcache->arch ());
-	 regnum++)
-      inf_ptrace_store_register (regcache, regnum);
-  else
-    inf_ptrace_store_register (regcache, regnum);
-}
-
-/* Create a "traditional" ptrace target.  REGISTER_U_OFFSET should be
-   a function returning the offset within the user area where a
-   particular register is stored.  */
-
-struct target_ops *
-inf_ptrace_trad_target (CORE_ADDR (*register_u_offset)
-					(struct gdbarch *, int, int))
-{
-  struct target_ops *t = inf_ptrace_target();
-
-  gdb_assert (register_u_offset);
-  inf_ptrace_register_u_offset = register_u_offset;
-  t->to_fetch_registers = inf_ptrace_fetch_registers;
-  t->to_store_registers = inf_ptrace_store_registers;
-
-  return t;
-}