gdb: rename rs6000-nat.c to rs6000-aix-nat.c

This file seems to be AIX-specific, according to its contents and
configure.nat.  Rename it to rs6000-aix-nat.c, to make that clear (and
to follow the convention).

Change-Id: Ib418dddc6b79b2e28f64431121742b5e87f5f4f5

1 files changed, 0 insertions, 675 deletions

diff --git a/gdb/rs6000-nat.c b/gdb/rs6000-nat.c
deleted file mode 100644
index c266c50..0000000
--- a/gdb/rs6000-nat.c
+++ /dev/null
@@ -1,675 +0,0 @@
-/* IBM RS/6000 native-dependent code for GDB, the GNU debugger.
-
-   Copyright (C) 1986-2021 Free Software Foundation, Inc.
-
-   This file is part of GDB.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 3 of the License, or
-   (at your option) any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
-
-#include "defs.h"
-#include "inferior.h"
-#include "target.h"
-#include "gdbcore.h"
-#include "symfile.h"
-#include "objfiles.h"
-#include "bfd.h"
-#include "gdb-stabs.h"
-#include "regcache.h"
-#include "arch-utils.h"
-#include "inf-child.h"
-#include "inf-ptrace.h"
-#include "ppc-tdep.h"
-#include "rs6000-tdep.h"
-#include "rs6000-aix-tdep.h"
-#include "exec.h"
-#include "observable.h"
-#include "xcoffread.h"
-
-#include <sys/ptrace.h>
-#include <sys/reg.h>
-
-#include <sys/dir.h>
-#include <sys/user.h>
-#include <signal.h>
-#include <sys/ioctl.h>
-#include <fcntl.h>
-
-#include <a.out.h>
-#include <sys/file.h>
-#include <sys/stat.h>
-#include "gdb_bfd.h"
-#include <sys/core.h>
-#define __LDINFO_PTRACE32__	/* for __ld_info32 */
-#define __LDINFO_PTRACE64__	/* for __ld_info64 */
-#include <sys/ldr.h>
-#include <sys/systemcfg.h>
-
-/* On AIX4.3+, sys/ldr.h provides different versions of struct ld_info for
-   debugging 32-bit and 64-bit processes.  Define a typedef and macros for
-   accessing fields in the appropriate structures.  */
-
-/* In 32-bit compilation mode (which is the only mode from which ptrace()
-   works on 4.3), __ld_info32 is #defined as equivalent to ld_info.  */
-
-#if defined (__ld_info32) || defined (__ld_info64)
-# define ARCH3264
-#endif
-
-/* Return whether the current architecture is 64-bit.  */
-
-#ifndef ARCH3264
-# define ARCH64() 0
-#else
-# define ARCH64() (register_size (target_gdbarch (), 0) == 8)
-#endif
-
-class rs6000_nat_target final : public inf_ptrace_target
-{
-public:
-  void fetch_registers (struct regcache *, int) override;
-  void store_registers (struct regcache *, int) override;
-
-  enum target_xfer_status xfer_partial (enum target_object object,
-					const char *annex,
-					gdb_byte *readbuf,
-					const gdb_byte *writebuf,
-					ULONGEST offset, ULONGEST len,
-					ULONGEST *xfered_len) override;
-
-  void create_inferior (const char *, const std::string &,
-			char **, int) override;
-
-  ptid_t wait (ptid_t, struct target_waitstatus *, target_wait_flags) override;
-
-private:
-  enum target_xfer_status
-    xfer_shared_libraries (enum target_object object,
-			   const char *annex, gdb_byte *readbuf,
-			   const gdb_byte *writebuf,
-			   ULONGEST offset, ULONGEST len,
-			   ULONGEST *xfered_len);
-};
-
-static rs6000_nat_target the_rs6000_nat_target;
-
-/* Given REGNO, a gdb register number, return the corresponding
-   number suitable for use as a ptrace() parameter.  Return -1 if
-   there's no suitable mapping.  Also, set the int pointed to by
-   ISFLOAT to indicate whether REGNO is a floating point register.  */
-
-static int
-regmap (struct gdbarch *gdbarch, int regno, int *isfloat)
-{
-  ppc_gdbarch_tdep *tdep = (ppc_gdbarch_tdep *) gdbarch_tdep (gdbarch);
-
-  *isfloat = 0;
-  if (tdep->ppc_gp0_regnum <= regno
-      && regno < tdep->ppc_gp0_regnum + ppc_num_gprs)
-    return regno;
-  else if (tdep->ppc_fp0_regnum >= 0
-	   && tdep->ppc_fp0_regnum <= regno
-	   && regno < tdep->ppc_fp0_regnum + ppc_num_fprs)
-    {
-      *isfloat = 1;
-      return regno - tdep->ppc_fp0_regnum + FPR0;
-    }
-  else if (regno == gdbarch_pc_regnum (gdbarch))
-    return IAR;
-  else if (regno == tdep->ppc_ps_regnum)
-    return MSR;
-  else if (regno == tdep->ppc_cr_regnum)
-    return CR;
-  else if (regno == tdep->ppc_lr_regnum)
-    return LR;
-  else if (regno == tdep->ppc_ctr_regnum)
-    return CTR;
-  else if (regno == tdep->ppc_xer_regnum)
-    return XER;
-  else if (tdep->ppc_fpscr_regnum >= 0
-	   && regno == tdep->ppc_fpscr_regnum)
-    return FPSCR;
-  else if (tdep->ppc_mq_regnum >= 0 && regno == tdep->ppc_mq_regnum)
-    return MQ;
-  else
-    return -1;
-}
-
-/* Call ptrace(REQ, ID, ADDR, DATA, BUF).  */
-
-static int
-rs6000_ptrace32 (int req, int id, int *addr, int data, int *buf)
-{
-#ifdef HAVE_PTRACE64
-  int ret = ptrace64 (req, id, (uintptr_t) addr, data, buf);
-#else
-  int ret = ptrace (req, id, (int *)addr, data, buf);
-#endif
-#if 0
-  printf ("rs6000_ptrace32 (%d, %d, 0x%x, %08x, 0x%x) = 0x%x\n",
-	  req, id, (unsigned int)addr, data, (unsigned int)buf, ret);
-#endif
-  return ret;
-}
-
-/* Call ptracex(REQ, ID, ADDR, DATA, BUF).  */
-
-static int
-rs6000_ptrace64 (int req, int id, long long addr, int data, void *buf)
-{
-#ifdef ARCH3264
-#  ifdef HAVE_PTRACE64
-  int ret = ptrace64 (req, id, addr, data, (PTRACE_TYPE_ARG5) buf);
-#  else
-  int ret = ptracex (req, id, addr, data, (PTRACE_TYPE_ARG5) buf);
-#  endif
-#else
-  int ret = 0;
-#endif
-#if 0
-  printf ("rs6000_ptrace64 (%d, %d, %s, %08x, 0x%x) = 0x%x\n",
-	  req, id, hex_string (addr), data, (unsigned int)buf, ret);
-#endif
-  return ret;
-}
-
-/* Fetch register REGNO from the inferior.  */
-
-static void
-fetch_register (struct regcache *regcache, int regno)
-{
-  struct gdbarch *gdbarch = regcache->arch ();
-  int addr[PPC_MAX_REGISTER_SIZE];
-  int nr, isfloat;
-  pid_t pid = regcache->ptid ().pid ();
-
-  /* Retrieved values may be -1, so infer errors from errno.  */
-  errno = 0;
-
-  nr = regmap (gdbarch, regno, &isfloat);
-
-  /* Floating-point registers.  */
-  if (isfloat)
-    rs6000_ptrace32 (PT_READ_FPR, pid, addr, nr, 0);
-
-  /* Bogus register number.  */
-  else if (nr < 0)
-    {
-      if (regno >= gdbarch_num_regs (gdbarch))
-	fprintf_unfiltered (gdb_stderr,
-			    "gdb error: register no %d not implemented.\n",
-			    regno);
-      return;
-    }
-
-  /* Fixed-point registers.  */
-  else
-    {
-      if (!ARCH64 ())
-	*addr = rs6000_ptrace32 (PT_READ_GPR, pid, (int *) nr, 0, 0);
-      else
-	{
-	  /* PT_READ_GPR requires the buffer parameter to point to long long,
-	     even if the register is really only 32 bits.  */
-	  long long buf;
-	  rs6000_ptrace64 (PT_READ_GPR, pid, nr, 0, &buf);
-	  if (register_size (gdbarch, regno) == 8)
-	    memcpy (addr, &buf, 8);
-	  else
-	    *addr = buf;
-	}
-    }
-
-  if (!errno)
-    regcache->raw_supply (regno, (char *) addr);
-  else
-    {
-#if 0
-      /* FIXME: this happens 3 times at the start of each 64-bit program.  */
-      perror (_("ptrace read"));
-#endif
-      errno = 0;
-    }
-}
-
-/* Store register REGNO back into the inferior.  */
-
-static void
-store_register (struct regcache *regcache, int regno)
-{
-  struct gdbarch *gdbarch = regcache->arch ();
-  int addr[PPC_MAX_REGISTER_SIZE];
-  int nr, isfloat;
-  pid_t pid = regcache->ptid ().pid ();
-
-  /* Fetch the register's value from the register cache.  */
-  regcache->raw_collect (regno, addr);
-
-  /* -1 can be a successful return value, so infer errors from errno.  */
-  errno = 0;
-
-  nr = regmap (gdbarch, regno, &isfloat);
-
-  /* Floating-point registers.  */
-  if (isfloat)
-    rs6000_ptrace32 (PT_WRITE_FPR, pid, addr, nr, 0);
-
-  /* Bogus register number.  */
-  else if (nr < 0)
-    {
-      if (regno >= gdbarch_num_regs (gdbarch))
-	fprintf_unfiltered (gdb_stderr,
-			    "gdb error: register no %d not implemented.\n",
-			    regno);
-    }
-
-  /* Fixed-point registers.  */
-  else
-    {
-      /* The PT_WRITE_GPR operation is rather odd.  For 32-bit inferiors,
-	 the register's value is passed by value, but for 64-bit inferiors,
-	 the address of a buffer containing the value is passed.  */
-      if (!ARCH64 ())
-	rs6000_ptrace32 (PT_WRITE_GPR, pid, (int *) nr, *addr, 0);
-      else
-	{
-	  /* PT_WRITE_GPR requires the buffer parameter to point to an 8-byte
-	     area, even if the register is really only 32 bits.  */
-	  long long buf;
-	  if (register_size (gdbarch, regno) == 8)
-	    memcpy (&buf, addr, 8);
-	  else
-	    buf = *addr;
-	  rs6000_ptrace64 (PT_WRITE_GPR, pid, nr, 0, &buf);
-	}
-    }
-
-  if (errno)
-    {
-      perror (_("ptrace write"));
-      errno = 0;
-    }
-}
-
-/* Read from the inferior all registers if REGNO == -1 and just register
-   REGNO otherwise.  */
-
-void
-rs6000_nat_target::fetch_registers (struct regcache *regcache, int regno)
-{
-  struct gdbarch *gdbarch = regcache->arch ();
-  if (regno != -1)
-    fetch_register (regcache, regno);
-
-  else
-    {
-      ppc_gdbarch_tdep *tdep = (ppc_gdbarch_tdep *) gdbarch_tdep (gdbarch);
-
-      /* Read 32 general purpose registers.  */
-      for (regno = tdep->ppc_gp0_regnum;
-	   regno < tdep->ppc_gp0_regnum + ppc_num_gprs;
-	   regno++)
-	{
-	  fetch_register (regcache, regno);
-	}
-
-      /* Read general purpose floating point registers.  */
-      if (tdep->ppc_fp0_regnum >= 0)
-	for (regno = 0; regno < ppc_num_fprs; regno++)
-	  fetch_register (regcache, tdep->ppc_fp0_regnum + regno);
-
-      /* Read special registers.  */
-      fetch_register (regcache, gdbarch_pc_regnum (gdbarch));
-      fetch_register (regcache, tdep->ppc_ps_regnum);
-      fetch_register (regcache, tdep->ppc_cr_regnum);
-      fetch_register (regcache, tdep->ppc_lr_regnum);
-      fetch_register (regcache, tdep->ppc_ctr_regnum);
-      fetch_register (regcache, tdep->ppc_xer_regnum);
-      if (tdep->ppc_fpscr_regnum >= 0)
-	fetch_register (regcache, tdep->ppc_fpscr_regnum);
-      if (tdep->ppc_mq_regnum >= 0)
-	fetch_register (regcache, tdep->ppc_mq_regnum);
-    }
-}
-
-/* Store our register values back into the inferior.
-   If REGNO is -1, do this for all registers.
-   Otherwise, REGNO specifies which register (so we can save time).  */
-
-void
-rs6000_nat_target::store_registers (struct regcache *regcache, int regno)
-{
-  struct gdbarch *gdbarch = regcache->arch ();
-  if (regno != -1)
-    store_register (regcache, regno);
-
-  else
-    {
-      ppc_gdbarch_tdep *tdep = (ppc_gdbarch_tdep *) gdbarch_tdep (gdbarch);
-
-      /* Write general purpose registers first.  */
-      for (regno = tdep->ppc_gp0_regnum;
-	   regno < tdep->ppc_gp0_regnum + ppc_num_gprs;
-	   regno++)
-	{
-	  store_register (regcache, regno);
-	}
-
-      /* Write floating point registers.  */
-      if (tdep->ppc_fp0_regnum >= 0)
-	for (regno = 0; regno < ppc_num_fprs; regno++)
-	  store_register (regcache, tdep->ppc_fp0_regnum + regno);
-
-      /* Write special registers.  */
-      store_register (regcache, gdbarch_pc_regnum (gdbarch));
-      store_register (regcache, tdep->ppc_ps_regnum);
-      store_register (regcache, tdep->ppc_cr_regnum);
-      store_register (regcache, tdep->ppc_lr_regnum);
-      store_register (regcache, tdep->ppc_ctr_regnum);
-      store_register (regcache, tdep->ppc_xer_regnum);
-      if (tdep->ppc_fpscr_regnum >= 0)
-	store_register (regcache, tdep->ppc_fpscr_regnum);
-      if (tdep->ppc_mq_regnum >= 0)
-	store_register (regcache, tdep->ppc_mq_regnum);
-    }
-}
-
-/* Implement the to_xfer_partial target_ops method.  */
-
-enum target_xfer_status
-rs6000_nat_target::xfer_partial (enum target_object object,
-				 const char *annex, gdb_byte *readbuf,
-				 const gdb_byte *writebuf,
-				 ULONGEST offset, ULONGEST len,
-				 ULONGEST *xfered_len)
-{
-  pid_t pid = inferior_ptid.pid ();
-  int arch64 = ARCH64 ();
-
-  switch (object)
-    {
-    case TARGET_OBJECT_LIBRARIES_AIX:
-      return xfer_shared_libraries (object, annex,
-				    readbuf, writebuf,
-				    offset, len, xfered_len);
-    case TARGET_OBJECT_MEMORY:
-      {
-	union
-	{
-	  PTRACE_TYPE_RET word;
-	  gdb_byte byte[sizeof (PTRACE_TYPE_RET)];
-	} buffer;
-	ULONGEST rounded_offset;
-	LONGEST partial_len;
-
-	/* Round the start offset down to the next long word
-	   boundary.  */
-	rounded_offset = offset & -(ULONGEST) sizeof (PTRACE_TYPE_RET);
-
-	/* Since ptrace will transfer a single word starting at that
-	   rounded_offset the partial_len needs to be adjusted down to
-	   that (remember this function only does a single transfer).
-	   Should the required length be even less, adjust it down
-	   again.  */
-	partial_len = (rounded_offset + sizeof (PTRACE_TYPE_RET)) - offset;
-	if (partial_len > len)
-	  partial_len = len;
-
-	if (writebuf)
-	  {
-	    /* If OFFSET:PARTIAL_LEN is smaller than
-	       ROUNDED_OFFSET:WORDSIZE then a read/modify write will
-	       be needed.  Read in the entire word.  */
-	    if (rounded_offset < offset
-		|| (offset + partial_len
-		    < rounded_offset + sizeof (PTRACE_TYPE_RET)))
-	      {
-		/* Need part of initial word -- fetch it.  */
-		if (arch64)
-		  buffer.word = rs6000_ptrace64 (PT_READ_I, pid,
-						 rounded_offset, 0, NULL);
-		else
-		  buffer.word = rs6000_ptrace32 (PT_READ_I, pid,
-						 (int *) (uintptr_t)
-						 rounded_offset,
-						 0, NULL);
-	      }
-
-	    /* Copy data to be written over corresponding part of
-	       buffer.  */
-	    memcpy (buffer.byte + (offset - rounded_offset),
-		    writebuf, partial_len);
-
-	    errno = 0;
-	    if (arch64)
-	      rs6000_ptrace64 (PT_WRITE_D, pid,
-			       rounded_offset, buffer.word, NULL);
-	    else
-	      rs6000_ptrace32 (PT_WRITE_D, pid,
-			       (int *) (uintptr_t) rounded_offset,
-			       buffer.word, NULL);
-	    if (errno)
-	      return TARGET_XFER_EOF;
-	  }
-
-	if (readbuf)
-	  {
-	    errno = 0;
-	    if (arch64)
-	      buffer.word = rs6000_ptrace64 (PT_READ_I, pid,
-					     rounded_offset, 0, NULL);
-	    else
-	      buffer.word = rs6000_ptrace32 (PT_READ_I, pid,
-					     (int *)(uintptr_t)rounded_offset,
-					     0, NULL);
-	    if (errno)
-	      return TARGET_XFER_EOF;
-
-	    /* Copy appropriate bytes out of the buffer.  */
-	    memcpy (readbuf, buffer.byte + (offset - rounded_offset),
-		    partial_len);
-	  }
-
-	*xfered_len = (ULONGEST) partial_len;
-	return TARGET_XFER_OK;
-      }
-
-    default:
-      return TARGET_XFER_E_IO;
-    }
-}
-
-/* Wait for the child specified by PTID to do something.  Return the
-   process ID of the child, or MINUS_ONE_PTID in case of error; store
-   the status in *OURSTATUS.  */
-
-ptid_t
-rs6000_nat_target::wait (ptid_t ptid, struct target_waitstatus *ourstatus,
-			 target_wait_flags options)
-{
-  pid_t pid;
-  int status, save_errno;
-
-  do
-    {
-      set_sigint_trap ();
-
-      do
-	{
-	  pid = waitpid (ptid.pid (), &status, 0);
-	  save_errno = errno;
-	}
-      while (pid == -1 && errno == EINTR);
-
-      clear_sigint_trap ();
-
-      if (pid == -1)
-	{
-	  fprintf_unfiltered (gdb_stderr,
-			      _("Child process unexpectedly missing: %s.\n"),
-			      safe_strerror (save_errno));
-
-	  /* Claim it exited with unknown signal.  */
-	  ourstatus->set_signalled (GDB_SIGNAL_UNKNOWN);
-	  return inferior_ptid;
-	}
-
-      /* Ignore terminated detached child processes.  */
-      if (!WIFSTOPPED (status) && pid != inferior_ptid.pid ())
-	pid = -1;
-    }
-  while (pid == -1);
-
-  /* AIX has a couple of strange returns from wait().  */
-
-  /* stop after load" status.  */
-  if (status == 0x57c)
-    ourstatus->set_loaded ();
-  /* signal 0.  I have no idea why wait(2) returns with this status word.  */
-  else if (status == 0x7f)
-    ourstatus->set_spurious ();
-  /* A normal waitstatus.  Let the usual macros deal with it.  */
-  else
-    store_waitstatus (ourstatus, status);
-
-  return ptid_t (pid);
-}
-
-
-/* Set the current architecture from the host running GDB.  Called when
-   starting a child process.  */
-
-void
-rs6000_nat_target::create_inferior (const char *exec_file,
-				    const std::string &allargs,
-				    char **env, int from_tty)
-{
-  enum bfd_architecture arch;
-  unsigned long mach;
-  bfd abfd;
-
-  inf_ptrace_target::create_inferior (exec_file, allargs, env, from_tty);
-
-  if (__power_rs ())
-    {
-      arch = bfd_arch_rs6000;
-      mach = bfd_mach_rs6k;
-    }
-  else
-    {
-      arch = bfd_arch_powerpc;
-      mach = bfd_mach_ppc;
-    }
-
-  /* FIXME: schauer/2002-02-25:
-     We don't know if we are executing a 32 or 64 bit executable,
-     and have no way to pass the proper word size to rs6000_gdbarch_init.
-     So we have to avoid switching to a new architecture, if the architecture
-     matches already.
-     Blindly calling rs6000_gdbarch_init used to work in older versions of
-     GDB, as rs6000_gdbarch_init incorrectly used the previous tdep to
-     determine the wordsize.  */
-  if (current_program_space->exec_bfd ())
-    {
-      const struct bfd_arch_info *exec_bfd_arch_info;
-
-      exec_bfd_arch_info
-	= bfd_get_arch_info (current_program_space->exec_bfd ());
-      if (arch == exec_bfd_arch_info->arch)
-	return;
-    }
-
-  bfd_default_set_arch_mach (&abfd, arch, mach);
-
-  gdbarch_info info;
-  info.bfd_arch_info = bfd_get_arch_info (&abfd);
-  info.abfd = current_program_space->exec_bfd ();
-
-  if (!gdbarch_update_p (info))
-    internal_error (__FILE__, __LINE__,
-		    _("rs6000_create_inferior: failed "
-		      "to select architecture"));
-}
-
-
-/* Shared Object support.  */
-
-/* Return the LdInfo data for the given process.  Raises an error
-   if the data could not be obtained.  */
-
-static gdb::byte_vector
-rs6000_ptrace_ldinfo (ptid_t ptid)
-{
-  const int pid = ptid.pid ();
-  gdb::byte_vector ldi (1024);
-  int rc = -1;
-
-  while (1)
-    {
-      if (ARCH64 ())
-	rc = rs6000_ptrace64 (PT_LDINFO, pid, (unsigned long) ldi.data (),
-			      ldi.size (), NULL);
-      else
-	rc = rs6000_ptrace32 (PT_LDINFO, pid, (int *) ldi.data (),
-			      ldi.size (), NULL);
-
-      if (rc != -1)
-	break; /* Success, we got the entire ld_info data.  */
-
-      if (errno != ENOMEM)
-	perror_with_name (_("ptrace ldinfo"));
-
-      /* ldi is not big enough.  Double it and try again.  */
-      ldi.resize (ldi.size () * 2);
-    }
-
-  return ldi;
-}
-
-/* Implement the to_xfer_partial target_ops method for
-   TARGET_OBJECT_LIBRARIES_AIX objects.  */
-
-enum target_xfer_status
-rs6000_nat_target::xfer_shared_libraries
-  (enum target_object object,
-   const char *annex, gdb_byte *readbuf, const gdb_byte *writebuf,
-   ULONGEST offset, ULONGEST len, ULONGEST *xfered_len)
-{
-  ULONGEST result;
-
-  /* This function assumes that it is being run with a live process.
-     Core files are handled via gdbarch.  */
-  gdb_assert (target_has_execution ());
-
-  if (writebuf)
-    return TARGET_XFER_E_IO;
-
-  gdb::byte_vector ldi_buf = rs6000_ptrace_ldinfo (inferior_ptid);
-  result = rs6000_aix_ld_info_to_xml (target_gdbarch (), ldi_buf.data (),
-				      readbuf, offset, len, 1);
-
-  if (result == 0)
-    return TARGET_XFER_EOF;
-  else
-    {
-      *xfered_len = result;
-      return TARGET_XFER_OK;
-    }
-}
-
-void _initialize_rs6000_nat ();
-void
-_initialize_rs6000_nat ()
-{
-  add_inf_child_target (&the_rs6000_nat_target);
-}