Added i386 QNX Neutrino support.

1 files changed, 298 insertions, 0 deletions

diff --git a/gdb/i386-nto-tdep.c b/gdb/i386-nto-tdep.c
new file mode 100644
index 0000000..42eb9ce
--- /dev/null
+++ b/gdb/i386-nto-tdep.c
@@ -0,0 +1,298 @@
+/* i386-nto-tdep.c - i386 specific functionality for QNX Neutrino.
+
+   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 "gdb_string.h"
+#include "gdb_assert.h"
+#include "defs.h"
+#include "frame.h"
+#include "target.h"
+#include "regcache.h"
+#include "solib-svr4.h"
+#include "i386-tdep.h"
+#include "nto-tdep.h"
+#include "osabi.h"
+#include "i387-tdep.h"
+
+#ifndef X86_CPU_FXSR
+#define X86_CPU_FXSR (1L << 12)
+#endif
+
+/* Why 13?  Look in our /usr/include/x86/context.h header at the
+   x86_cpu_registers structure and you'll see an 'exx' junk register
+   that is just filler.  Don't ask me, ask the kernel guys.  */
+#define NUM_GPREGS 13
+
+/* Map a GDB register number to an offset in the reg structure.  */
+static int regmap[] = {
+  (7 * 4),			/* eax */
+  (6 * 4),			/* ecx */
+  (5 * 4),			/* edx */
+  (4 * 4),			/* ebx */
+  (11 * 4),			/* esp */
+  (2 * 4),			/* epb */
+  (1 * 4),			/* esi */
+  (0 * 4),			/* edi */
+  (8 * 4),			/* eip */
+  (10 * 4),			/* eflags */
+  (9 * 4),			/* cs */
+  (12 * 4),			/* ss */
+  (-1 * 4)			/* filler */
+};
+
+/* Given a gdb regno, return the offset into Neutrino's register structure
+   or -1 if register is unknown.  */
+static int
+nto_reg_offset (int regno)
+{
+  return (regno >= 0 && regno < NUM_GPREGS) ? regmap[regno] : -1;
+}
+
+static void
+i386nto_supply_gregset (char *gpregs)
+{
+  unsigned regno;
+  int empty = 0;
+
+  for (regno = 0; regno < FP0_REGNUM; regno++)
+    {
+      int offset = nto_reg_offset (regno);
+      if (offset == -1)
+	supply_register (regno, (char *) &empty);
+      else
+	supply_register (regno, gpregs + offset);
+    }
+}
+
+static void
+i386nto_supply_fpregset (char *fpregs)
+{
+  if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR)
+    i387_supply_fxsave (fpregs);
+  else
+    i387_supply_fsave (fpregs);
+}
+
+static void
+i386nto_supply_regset (int regset, char *data)
+{
+  switch (regset)
+    {
+    case NTO_REG_GENERAL:	/* QNX has different ordering of GP regs than GDB.  */
+      i386nto_supply_gregset (data);
+      break;
+    case NTO_REG_FLOAT:
+      i386nto_supply_fpregset (data);
+      break;
+    }
+}
+
+static int
+i386nto_regset_id (int regno)
+{
+  if (regno == -1)
+    return NTO_REG_END;
+  else if (regno < FP0_REGNUM)
+    return NTO_REG_GENERAL;
+  else if (regno < FPC_REGNUM)
+    return NTO_REG_FLOAT;
+
+  return -1;			/* Error.  */
+}
+
+static int
+i386nto_register_area (int regno, int regset, unsigned *off)
+{
+  int len;
+
+  *off = 0;
+  if (regset == NTO_REG_GENERAL)
+    {
+      if (regno == -1)
+	return NUM_GPREGS * 4;
+
+      *off = nto_reg_offset (regno);
+      if (*off == -1)
+	return 0;
+      return 4;
+    }
+  else if (regset == NTO_REG_FLOAT)
+    {
+      unsigned off_adjust, regsize, regset_size;
+
+      if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR)
+	{
+	  off_adjust = 32;
+	  regsize = 16;
+	  regset_size = 512;
+	}
+      else
+	{
+	  off_adjust = 28;
+	  regsize = 10;
+	  regset_size = 128;
+	}
+
+      if (regno == -1)
+	return regset_size;
+
+      *off = (regno - FP0_REGNUM) * regsize + off_adjust;
+      return 10;
+      /* Why 10 instead of regsize?  GDB only stores 10 bytes per FP
+         register so if we're sending a register back to the target,
+         we only want pdebug to write 10 bytes so as not to clobber
+         the reserved 6 bytes in the fxsave structure.  */
+    }
+  return -1;
+}
+
+static int
+i386nto_regset_fill (int regset, char *data)
+{
+  if (regset == NTO_REG_GENERAL)
+    {
+      int regno;
+
+      for (regno = 0; regno < NUM_GPREGS; regno++)
+	{
+	  int offset = nto_reg_offset (regno);
+	  if (offset != -1)
+	    regcache_collect (regno, data + offset);
+	}
+    }
+  else if (regset == NTO_REG_FLOAT)
+    {
+      if (nto_cpuinfo_valid && nto_cpuinfo_flags | X86_CPU_FXSR)
+	i387_fill_fxsave (data, -1);
+      else
+	i387_fill_fsave (data, -1);
+    }
+  else
+    return -1;
+
+  return 0;
+}
+
+static struct link_map_offsets *
+i386nto_svr4_fetch_link_map_offsets (void)
+{
+  static struct link_map_offsets lmo;
+  static struct link_map_offsets *lmp = NULL;
+
+  if (lmp == NULL)
+    {
+      lmp = &lmo;
+
+      lmo.r_debug_size = 8;	/* The actual size is 20 bytes, but
+				   only 8 bytes are used.  */
+      lmo.r_map_offset = 4;
+      lmo.r_map_size = 4;
+
+      lmo.link_map_size = 20;	/* The actual size is 552 bytes, but
+				   only 20 bytes are used.  */
+      lmo.l_addr_offset = 0;
+      lmo.l_addr_size = 4;
+
+      lmo.l_name_offset = 4;
+      lmo.l_name_size = 4;
+
+      lmo.l_next_offset = 12;
+      lmo.l_next_size = 4;
+
+      lmo.l_prev_offset = 16;
+      lmo.l_prev_size = 4;
+    }
+
+  return lmp;
+}
+
+static int
+i386nto_pc_in_sigtramp (CORE_ADDR pc, char *name)
+{
+  return name && strcmp ("__signalstub", name) == 0;
+}
+
+#define SIGCONTEXT_OFFSET 136
+static CORE_ADDR
+i386nto_sigcontext_addr (struct frame_info *frame)
+{
+  if (get_next_frame (frame))
+    return get_frame_base (get_next_frame (frame)) + SIGCONTEXT_OFFSET;
+
+  return read_register (SP_REGNUM) + SIGCONTEXT_OFFSET;
+}
+
+static void
+init_i386nto_ops ()
+{
+  current_nto_target.nto_regset_id = i386nto_regset_id;
+  current_nto_target.nto_supply_gregset = i386nto_supply_gregset;
+  current_nto_target.nto_supply_fpregset = i386nto_supply_fpregset;
+  current_nto_target.nto_supply_altregset = nto_dummy_supply_regset;
+  current_nto_target.nto_supply_regset = i386nto_supply_regset;
+  current_nto_target.nto_register_area = i386nto_register_area;
+  current_nto_target.nto_regset_fill = i386nto_regset_fill;
+  current_nto_target.nto_fetch_link_map_offsets =
+    i386nto_svr4_fetch_link_map_offsets;
+}
+
+static void
+i386nto_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+  /* NTO uses ELF.  */
+  i386_elf_init_abi (info, gdbarch);
+
+  /* Neutrino rewinds to look more normal.  */
+  set_gdbarch_decr_pc_after_break (gdbarch, 0);
+
+  /* NTO has shared libraries.  */
+  set_gdbarch_in_solib_call_trampoline (gdbarch, in_plt_section);
+  set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
+
+  set_gdbarch_pc_in_sigtramp (gdbarch, i386nto_pc_in_sigtramp);
+  tdep->sigcontext_addr = i386nto_sigcontext_addr;
+  tdep->sc_pc_offset = 56;
+  tdep->sc_sp_offset = 68;
+
+  /* Setjmp()'s return PC saved in EDX (5).  */
+  tdep->jb_pc_offset = 20;	/* 5x32 bit ints in.  */
+
+  set_solib_svr4_fetch_link_map_offsets (gdbarch,
+					 i386nto_svr4_fetch_link_map_offsets);
+
+  /* Our loader handles solib relocations slightly differently than svr4.  */
+  TARGET_SO_RELOCATE_SECTION_ADDRESSES = nto_relocate_section_addresses;
+
+  /* Supply a nice function to find our solibs.  */
+  TARGET_SO_FIND_AND_OPEN_SOLIB = nto_find_and_open_solib;
+
+  init_i386nto_ops ();
+}
+
+void
+_initialize_i386nto_tdep (void)
+{
+  gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_QNXNTO,
+			  i386nto_init_abi);
+}