Added i386 QNX Neutrino support.

1 files changed, 341 insertions, 0 deletions

diff --git a/gdb/nto-tdep.c b/gdb/nto-tdep.c
new file mode 100644
index 0000000..abf63b9
--- /dev/null
+++ b/gdb/nto-tdep.c
@@ -0,0 +1,341 @@
+/* nto-tdep.c - general QNX Neutrino target functionality.
+
+   Copyright 2003 Free Software Foundation, Inc.
+
+   Contributed by QNX Software Systems Ltd.
+
+   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 2 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, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <sys/stat.h>
+#include "gdb_string.h"
+#include "nto-tdep.h"
+#include "top.h"
+#include "cli/cli-decode.h"
+#include "cli/cli-cmds.h"
+#include "inferior.h"
+#include "gdbarch.h"
+#include "bfd.h"
+#include "elf-bfd.h"
+#include "solib-svr4.h"
+#include "gdbcore.h"
+
+#ifdef __CYGWIN__
+#include <sys/cygwin.h>
+#endif
+
+#ifdef __CYGWIN__
+static char default_nto_target[] = "C:\\QNXsdk\\target\\qnx6";
+#elif defined(__sun__) || defined(linux)
+static char default_nto_target[] = "/opt/QNXsdk/target/qnx6";
+#else
+static char default_nto_target[] = "";
+#endif
+
+struct nto_target_ops current_nto_target;
+
+static char *
+nto_target (void)
+{
+  char *p = getenv ("QNX_TARGET");
+
+#ifdef __CYGWIN__
+  static char buf[PATH_MAX];
+  if (p)
+    cygwin_conv_to_posix_path (p, buf);
+  else
+    cygwin_conv_to_posix_path (default_nto_target, buf);
+  return buf;
+#else
+  return p ? p : default_nto_target;
+#endif
+}
+
+/* Take a string such as i386, rs6000, etc. and map it onto CPUTYPE_X86,
+   CPUTYPE_PPC, etc. as defined in nto-share/dsmsgs.h.  */
+int
+nto_map_arch_to_cputype (const char *arch)
+{
+  if (!strcmp (arch, "i386") || !strcmp (arch, "x86"))
+    return CPUTYPE_X86;
+  if (!strcmp (arch, "rs6000") || !strcmp (arch, "ppc"))
+    return CPUTYPE_PPC;
+  if (!strcmp (arch, "mips"))
+    return CPUTYPE_MIPS;
+  if (!strcmp (arch, "arm"))
+    return CPUTYPE_ARM;
+  if (!strcmp (arch, "sh"))
+    return CPUTYPE_SH;
+  return CPUTYPE_UNKNOWN;
+}
+
+int
+nto_find_and_open_solib (char *solib, unsigned o_flags, char **temp_pathname)
+{
+  char *buf, arch_path[PATH_MAX], *nto_root, *endian;
+  const char *arch;
+  char *path_fmt = "%s/lib:%s/usr/lib:%s/usr/photon/lib\
+:%s/usr/photon/dll:%s/lib/dll";
+
+  nto_root = nto_target ();
+  if (strcmp (TARGET_ARCHITECTURE->arch_name, "i386") == 0)
+    {
+      arch = "x86";
+      endian = "";
+    }
+  else if (strcmp (TARGET_ARCHITECTURE->arch_name, "rs6000") == 0)
+    {
+      arch = "ppc";
+      endian = "be";
+    }
+  else
+    {
+      arch = TARGET_ARCHITECTURE->arch_name;
+      endian = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "be" : "le";
+    }
+
+  sprintf (arch_path, "%s/%s%s", nto_root, arch, endian);
+
+  buf = alloca (strlen (path_fmt) + strlen (arch_path) * 5 + 1);
+  sprintf (buf, path_fmt, arch_path, arch_path, arch_path, arch_path,
+	   arch_path);
+
+  return openp (buf, 1, solib, o_flags, 0, temp_pathname);
+}
+
+void
+nto_init_solib_absolute_prefix (void)
+{
+  char buf[PATH_MAX * 2], arch_path[PATH_MAX];
+  char *nto_root, *endian;
+  const char *arch;
+
+  nto_root = nto_target ();
+  if (strcmp (TARGET_ARCHITECTURE->arch_name, "i386") == 0)
+    {
+      arch = "x86";
+      endian = "";
+    }
+  else if (strcmp (TARGET_ARCHITECTURE->arch_name, "rs6000") == 0)
+    {
+      arch = "ppc";
+      endian = "be";
+    }
+  else
+    {
+      arch = TARGET_ARCHITECTURE->arch_name;
+      endian = TARGET_BYTE_ORDER == BFD_ENDIAN_BIG ? "be" : "le";
+    }
+
+  sprintf (arch_path, "%s/%s%s", nto_root, arch, endian);
+
+  sprintf (buf, "set solib-absolute-prefix %s", arch_path);
+  execute_command (buf, 0);
+}
+
+char **
+nto_parse_redirection (char *pargv[], char **pin, char **pout, char **perr)
+{
+  char **argv;
+  char *in, *out, *err, *p;
+  int argc, i, n;
+
+  for (n = 0; pargv[n]; n++);
+  if (n == 0)
+    return NULL;
+  in = "";
+  out = "";
+  err = "";
+
+  argv = xcalloc (n + 1, sizeof argv[0]);
+  argc = n;
+  for (i = 0, n = 0; n < argc; n++)
+    {
+      p = pargv[n];
+      if (*p == '>')
+	{
+	  p++;
+	  if (*p)
+	    out = p;
+	  else
+	    out = pargv[++n];
+	}
+      else if (*p == '<')
+	{
+	  p++;
+	  if (*p)
+	    in = p;
+	  else
+	    in = pargv[++n];
+	}
+      else if (*p++ == '2' && *p++ == '>')
+	{
+	  if (*p == '&' && *(p + 1) == '1')
+	    err = out;
+	  else if (*p)
+	    err = p;
+	  else
+	    err = pargv[++n];
+	}
+      else
+	argv[i++] = pargv[n];
+    }
+  *pin = in;
+  *pout = out;
+  *perr = err;
+  return argv;
+}
+
+/* The struct lm_info, LM_ADDR, and nto_truncate_ptr are copied from
+   solib-svr4.c to support nto_relocate_section_addresses
+   which is different from the svr4 version.  */
+
+struct lm_info
+{
+  /* Pointer to copy of link map from inferior.  The type is char *
+     rather than void *, so that we may use byte offsets to find the
+     various fields without the need for a cast.  */
+  char *lm;
+};
+
+static CORE_ADDR
+LM_ADDR (struct so_list *so)
+{
+  struct link_map_offsets *lmo = nto_fetch_link_map_offsets ();
+
+  return (CORE_ADDR) extract_signed_integer (so->lm_info->lm +
+					     lmo->l_addr_offset,
+					     lmo->l_addr_size);
+}
+
+static CORE_ADDR
+nto_truncate_ptr (CORE_ADDR addr)
+{
+  if (TARGET_PTR_BIT == sizeof (CORE_ADDR) * 8)
+    /* We don't need to truncate anything, and the bit twiddling below
+       will fail due to overflow problems.  */
+    return addr;
+  else
+    return addr & (((CORE_ADDR) 1 << TARGET_PTR_BIT) - 1);
+}
+
+Elf_Internal_Phdr *
+find_load_phdr (bfd *abfd)
+{
+  Elf_Internal_Phdr *phdr;
+  unsigned int i;
+
+  if (!elf_tdata (abfd))
+    return NULL;
+
+  phdr = elf_tdata (abfd)->phdr;
+  for (i = 0; i < elf_elfheader (abfd)->e_phnum; i++, phdr++)
+    {
+      if (phdr->p_type == PT_LOAD && (phdr->p_flags & PF_X))
+	return phdr;
+    }
+  return NULL;
+}
+
+void
+nto_relocate_section_addresses (struct so_list *so, struct section_table *sec)
+{
+  /* Neutrino treats the l_addr base address field in link.h as different than
+     the base address in the System V ABI and so the offset needs to be
+     calculated and applied to relocations.  */
+  Elf_Internal_Phdr *phdr = find_load_phdr (sec->bfd);
+  unsigned vaddr = phdr ? phdr->p_vaddr : 0;
+
+  sec->addr = nto_truncate_ptr (sec->addr + LM_ADDR (so) - vaddr);
+  sec->endaddr = nto_truncate_ptr (sec->endaddr + LM_ADDR (so) - vaddr);
+}
+
+static void
+fetch_core_registers (char *core_reg_sect, unsigned core_reg_size,
+		      int which, CORE_ADDR reg_addr)
+{
+  nto_regset_t regset;
+
+  nto_init_solib_absolute_prefix ();
+
+  if (which == NTO_REG_GENERAL)
+    {
+      memcpy ((char *) &regset, core_reg_sect,
+	      min (core_reg_size, sizeof (regset)));
+      nto_supply_gregset ((char *) &regset);
+    }
+  else if (which == NTO_REG_FLOAT)
+    {
+      memcpy ((char *) &regset, core_reg_sect,
+	      min (core_reg_size, sizeof (regset)));
+      nto_supply_fpregset ((char *) &regset);
+    }
+  else if (which == NTO_REG_ALT)
+    {
+      memcpy ((char *) &regset, core_reg_sect,
+	      min (core_reg_size, sizeof (regset)));
+      nto_supply_altregset ((char *) &regset);
+    }
+}
+
+void
+nto_dummy_supply_regset (char *regs)
+{
+  /* Do nothing.  */
+}
+
+/* Register that we are able to handle ELF file formats using standard
+   procfs "regset" structures.  */
+static struct core_fns regset_core_fns = {
+  bfd_target_elf_flavour,	/* core_flavour */
+  default_check_format,		/* check_format */
+  default_core_sniffer,		/* core_sniffer */
+  fetch_core_registers,		/* core_read_registers */
+  NULL				/* next */
+};
+
+void
+_initialize_nto_tdep ()
+{
+  add_show_from_set (add_set_cmd ("nto-debug", class_maintenance, var_zinteger, (char *) &nto_internal_debugging, "Set QNX NTO internal debugging.\n\
+When non-zero, nto specific debug info is\n\
+displayed. Different information is displayed\n\
+for different positive values.", &setdebuglist),
+		     &showdebuglist);
+
+  /* We use SIG45 for pulses, or something, so nostop, noprint
+     and pass them.  */
+  signal_stop_update (target_signal_from_name ("SIG45"), 0);
+  signal_print_update (target_signal_from_name ("SIG45"), 0);
+  signal_pass_update (target_signal_from_name ("SIG45"), 1);
+
+  /* By default we don't want to stop on these two, but we do want to pass.  */
+#if defined(SIGSELECT)
+  signal_stop_update (SIGSELECT, 0);
+  signal_print_update (SIGSELECT, 0);
+  signal_pass_update (SIGSELECT, 1);
+#endif
+
+#if defined(SIGPHOTON)
+  signal_stop_update (SIGPHOTON, 0);
+  signal_print_update (SIGPHOTON, 0);
+  signal_pass_update (SIGPHOTON, 1);
+#endif
+
+  /* Register core file support.  */
+  add_core_fns (&regset_core_fns);
+}