gdb/sparcnbsd-tdep.c - binutils-gdb - Git at Google

 /* Target-dependent code for NetBSD/sparc.

    Copyright 2002, 2003, 2004 Free Software Foundation, Inc.
    Contributed by Wasabi Systems, 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 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 "defs.h"
 #include "floatformat.h"
 #include "frame.h"
 #include "frame-unwind.h"
 #include "gdbcore.h"
 #include "osabi.h"
 #include "regcache.h"
 #include "solib-svr4.h"
 #include "symtab.h"
 #include "trad-frame.h"

 #include "gdb_assert.h"
 #include "gdb_string.h"

 #include "sparc-tdep.h"
 #include "nbsd-tdep.h"

 const struct sparc_gregset sparc32nbsd_gregset =
 {
   0 * 4,			/* %psr */
   1 * 4,			/* %pc */
   2 * 4,			/* %npc */
   3 * 4,			/* %y */
   -1,				/* %wim */
   -1,				/* %tbr */
   5 * 4,			/* %g1 */
   -1				/* %l0 */
 };

 /* Unlike other NetBSD implementations, the SPARC port historically
    used .reg and .reg2 (see bfd/netbsd-core.c), and as such, we can
    share one routine for a.out and ELF core files.  */

 static void
 fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
                       CORE_ADDR ignore)
 {
   int reg_size = 20 * 4;
   int fpreg_size = 33 * 4;

   switch (which)
     {
     case 0:  /* Integer registers.  */
       if (core_reg_size != reg_size)
 	warning ("Wrong size register set in core file.");
       sparc32_supply_gregset (&sparc32nbsd_gregset, current_regcache,
 			      -1, core_reg_sect);
       break;

     case 2:  /* Floating pointer registers.  */
       if (core_reg_size != fpreg_size)
 	warning ("Wrong size FP register set in core file.");
       sparc32_supply_fpregset (current_regcache, -1, core_reg_sect);
       break;

     default:
       /* Don't know what kind of register request this is; just ignore it.  */
       break;
     }
 }

 static struct core_fns sparcnbsd_core_fns =
 {
   bfd_target_unknown_flavour,		/* core_flavour */
   default_check_format,			/* check_format */
   default_core_sniffer,			/* core_sniffer */
   fetch_core_registers,			/* core_read_registers */
   NULL
 };

 static struct core_fns sparcnbsd_elfcore_fns =
 {
   bfd_target_elf_flavour,		/* core_flavour */
   default_check_format,			/* check_format */
   default_core_sniffer,			/* core_sniffer */
   fetch_core_registers,			/* core_read_registers */
   NULL
 };

 /* Signal trampolines.  */

 /* The following variables describe the location of an on-stack signal
    trampoline.  The current values correspond to the memory layout for
    NetBSD 1.3 and up.  These shouldn't be necessary for NetBSD 2.0 and
    up, since NetBSD uses signal trampolines provided by libc now.  */

 static const CORE_ADDR sparc32nbsd_sigtramp_start = 0xeffffef0;
 static const CORE_ADDR sparc32nbsd_sigtramp_end = 0xeffffff0;

 static int
 sparc32nbsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
 {
   if (pc >= sparc32nbsd_sigtramp_start && pc < sparc32nbsd_sigtramp_end)
     return 1;

   return nbsd_pc_in_sigtramp (pc, name);
 }

 static struct sparc_frame_cache *
 sparc32nbsd_sigcontext_frame_cache (struct frame_info *next_frame,
 				    void **this_cache)
 {
   struct sparc_frame_cache *cache;
   CORE_ADDR addr, sigcontext_addr;
   LONGEST psr;
   int regnum, delta;

   if (*this_cache)
     return *this_cache;

   cache = sparc_frame_cache (next_frame, this_cache);
   gdb_assert (cache == *this_cache);

   /* The registers are saved in bits and pieces scattered all over the
      place.  The code below records their location on the assumption
      that the part of the signal trampoline that saves the state has
      been executed.  */

   /* If we couldn't find the frame's function, we're probably dealing
      with an on-stack signal trampoline.  */
   if (cache->pc == 0)
     {
       cache->pc = sparc32nbsd_sigtramp_start;

       /* Since we couldn't find the frame's function, the cache was
          initialized under the assumption that we're frameless.  */
       cache->frameless_p = 0;
       addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM);
       cache->base = addr;
     }

   cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);

   /* We find the appropriate instance of `struct sigcontext' at a
      fixed offset in the signal frame.  */
   sigcontext_addr = cache->base + 64 + 16;

   cache->saved_regs[SPARC_SP_REGNUM].addr = sigcontext_addr + 8;
   cache->saved_regs[SPARC32_PC_REGNUM].addr = sigcontext_addr + 12;
   cache->saved_regs[SPARC32_NPC_REGNUM].addr = sigcontext_addr + 16;
   cache->saved_regs[SPARC32_PSR_REGNUM].addr = sigcontext_addr + 20;
   cache->saved_regs[SPARC_G1_REGNUM].addr = sigcontext_addr + 24;
   cache->saved_regs[SPARC_O0_REGNUM].addr = sigcontext_addr + 28;

   /* The remaining `global' registers and %y are saved in the `local'
      registers.  */
   delta = SPARC_L0_REGNUM - SPARC_G0_REGNUM;
   for (regnum = SPARC_G2_REGNUM; regnum <= SPARC_G7_REGNUM; regnum++)
     cache->saved_regs[regnum].realreg = regnum + delta;
   cache->saved_regs[SPARC32_Y_REGNUM].realreg = SPARC_L1_REGNUM;

   /* The remaining `out' registers can be found in the current frame's
      `in' registers.  */
   delta = SPARC_I0_REGNUM - SPARC_O0_REGNUM;
   for (regnum = SPARC_O1_REGNUM; regnum <= SPARC_O5_REGNUM; regnum++)
     cache->saved_regs[regnum].realreg = regnum + delta;
   cache->saved_regs[SPARC_O7_REGNUM].realreg = SPARC_I7_REGNUM;

   /* The `local' and `in' registers have been saved in the register
      save area.  */
   addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
   addr = get_frame_memory_unsigned (next_frame, addr, 4);
   for (regnum = SPARC_L0_REGNUM;
        regnum <= SPARC_I7_REGNUM; regnum++, addr += 4)
     cache->saved_regs[regnum].addr = addr;

   /* The floating-point registers are only saved if the EF bit in %prs
      has been set.  */

 #define PSR_EF	0x00001000

   addr = cache->saved_regs[SPARC32_PSR_REGNUM].addr;
   psr = get_frame_memory_unsigned (next_frame, addr, 4);
   if (psr & PSR_EF)
     {
       CORE_ADDR sp;

       sp = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
       cache->saved_regs[SPARC32_FSR_REGNUM].addr = sp + 96;
       for (regnum = SPARC_F0_REGNUM, addr = sp + 96 + 8;
 	   regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
 	cache->saved_regs[regnum].addr = addr;
     }

   return cache;
 }

 static void
 sparc32nbsd_sigcontext_frame_this_id (struct frame_info *next_frame,
 				      void **this_cache,
 				      struct frame_id *this_id)
 {
   struct sparc_frame_cache *cache =
     sparc32nbsd_sigcontext_frame_cache (next_frame, this_cache);

   (*this_id) = frame_id_build (cache->base, cache->pc);
 }

 static void
 sparc32nbsd_sigcontext_frame_prev_register (struct frame_info *next_frame,
 					    void **this_cache,
 					    int regnum, int *optimizedp,
 					    enum lval_type *lvalp,
 					    CORE_ADDR *addrp,
 					    int *realnump, void *valuep)
 {
   struct sparc_frame_cache *cache =
     sparc32nbsd_sigcontext_frame_cache (next_frame, this_cache);

   trad_frame_prev_register (next_frame, cache->saved_regs, regnum,
 			    optimizedp, lvalp, addrp, realnump, valuep);
 }

 static const struct frame_unwind sparc32nbsd_sigcontext_frame_unwind =
 {
   SIGTRAMP_FRAME,
   sparc32nbsd_sigcontext_frame_this_id,
   sparc32nbsd_sigcontext_frame_prev_register
 };

 static const struct frame_unwind *
 sparc32nbsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
 {
   CORE_ADDR pc = frame_pc_unwind (next_frame);
   char *name;

   find_pc_partial_function (pc, &name, NULL, NULL);
   if (sparc32nbsd_pc_in_sigtramp (pc, name))
     {
       if (name == NULL || strncmp (name, "__sigtramp_sigcontext", 21))
 	return &sparc32nbsd_sigcontext_frame_unwind;
     }

   return NULL;
 }


 /* Return non-zero if we are in a shared library trampoline code stub.  */

 static int
 sparcnbsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name)
 {
   return (name && !strcmp (name, "_DYNAMIC"));
 }

 static void
 sparc32nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
   /* NetBSD doesn't support the 128-bit `long double' from the psABI.  */
   set_gdbarch_long_double_bit (gdbarch, 64);
   set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_double_big);

   set_gdbarch_pc_in_sigtramp (gdbarch, sparc32nbsd_pc_in_sigtramp);
   frame_unwind_append_sniffer (gdbarch, sparc32nbsd_sigtramp_frame_sniffer);
 }

 static void
 sparc32nbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
   sparc32nbsd_init_abi (info, gdbarch);

   set_gdbarch_in_solib_call_trampoline
     (gdbarch, sparcnbsd_aout_in_solib_call_trampoline);
 }

 static void
 sparc32nbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
   sparc32nbsd_init_abi (info, gdbarch);

   set_solib_svr4_fetch_link_map_offsets
     (gdbarch, nbsd_ilp32_solib_svr4_fetch_link_map_offsets);
 }

 static enum gdb_osabi
 sparcnbsd_aout_osabi_sniffer (bfd *abfd)
 {
   if (strcmp (bfd_get_target (abfd), "a.out-sparc-netbsd") == 0)
     return GDB_OSABI_NETBSD_AOUT;

   return GDB_OSABI_UNKNOWN;
 }


 /* Provide a prototype to silence -Wmissing-prototypes.  */
 void _initialize_sparcnbsd_tdep (void);

 void
 _initialize_sparnbsd_tdep (void)
 {
   gdbarch_register_osabi_sniffer (bfd_arch_sparc, bfd_target_aout_flavour,
 				  sparcnbsd_aout_osabi_sniffer);

   gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_AOUT,
 			  sparc32nbsd_aout_init_abi);
   gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_ELF,
 			  sparc32nbsd_elf_init_abi);

   add_core_fns (&sparcnbsd_core_fns);
   add_core_fns (&sparcnbsd_elfcore_fns);
 }
	/* Target-dependent code for NetBSD/sparc.

	Copyright 2002, 2003, 2004 Free Software Foundation, Inc.
	Contributed by Wasabi Systems, 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 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 "defs.h"
	#include "floatformat.h"
	#include "frame.h"
	#include "frame-unwind.h"
	#include "gdbcore.h"
	#include "osabi.h"
	#include "regcache.h"
	#include "solib-svr4.h"
	#include "symtab.h"
	#include "trad-frame.h"

	#include "gdb_assert.h"
	#include "gdb_string.h"

	#include "sparc-tdep.h"
	#include "nbsd-tdep.h"

	const struct sparc_gregset sparc32nbsd_gregset =
	{
	0 * 4, /* %psr */
	1 * 4, /* %pc */
	2 * 4, /* %npc */
	3 * 4, /* %y */
	-1, /* %wim */
	-1, /* %tbr */
	5 * 4, /* %g1 */
	-1 /* %l0 */
	};

	/* Unlike other NetBSD implementations, the SPARC port historically
	used .reg and .reg2 (see bfd/netbsd-core.c), and as such, we can
	share one routine for a.out and ELF core files. */

	static void
	fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which,
	CORE_ADDR ignore)
	{
	int reg_size = 20 * 4;
	int fpreg_size = 33 * 4;

	switch (which)
	{
	case 0: /* Integer registers. */
	if (core_reg_size != reg_size)
	warning ("Wrong size register set in core file.");
	sparc32_supply_gregset (&sparc32nbsd_gregset, current_regcache,
	-1, core_reg_sect);
	break;

	case 2: /* Floating pointer registers. */
	if (core_reg_size != fpreg_size)
	warning ("Wrong size FP register set in core file.");
	sparc32_supply_fpregset (current_regcache, -1, core_reg_sect);
	break;

	default:
	/* Don't know what kind of register request this is; just ignore it. */
	break;
	}
	}

	static struct core_fns sparcnbsd_core_fns =
	{
	bfd_target_unknown_flavour, /* core_flavour */
	default_check_format, /* check_format */
	default_core_sniffer, /* core_sniffer */
	fetch_core_registers, /* core_read_registers */
	NULL
	};

	static struct core_fns sparcnbsd_elfcore_fns =
	{
	bfd_target_elf_flavour, /* core_flavour */
	default_check_format, /* check_format */
	default_core_sniffer, /* core_sniffer */
	fetch_core_registers, /* core_read_registers */
	NULL
	};

	/* Signal trampolines. */

	/* The following variables describe the location of an on-stack signal
	trampoline. The current values correspond to the memory layout for
	NetBSD 1.3 and up. These shouldn't be necessary for NetBSD 2.0 and
	up, since NetBSD uses signal trampolines provided by libc now. */

	static const CORE_ADDR sparc32nbsd_sigtramp_start = 0xeffffef0;
	static const CORE_ADDR sparc32nbsd_sigtramp_end = 0xeffffff0;

	static int
	sparc32nbsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
	{
	if (pc >= sparc32nbsd_sigtramp_start && pc < sparc32nbsd_sigtramp_end)
	return 1;

	return nbsd_pc_in_sigtramp (pc, name);
	}

	static struct sparc_frame_cache *
	sparc32nbsd_sigcontext_frame_cache (struct frame_info *next_frame,
	void **this_cache)
	{
	struct sparc_frame_cache *cache;
	CORE_ADDR addr, sigcontext_addr;
	LONGEST psr;
	int regnum, delta;

	if (*this_cache)
	return *this_cache;

	cache = sparc_frame_cache (next_frame, this_cache);
	gdb_assert (cache == *this_cache);

	/* The registers are saved in bits and pieces scattered all over the
	place. The code below records their location on the assumption
	that the part of the signal trampoline that saves the state has
	been executed. */

	/* If we couldn't find the frame's function, we're probably dealing
	with an on-stack signal trampoline. */
	if (cache->pc == 0)
	{
	cache->pc = sparc32nbsd_sigtramp_start;

	/* Since we couldn't find the frame's function, the cache was
	initialized under the assumption that we're frameless. */
	cache->frameless_p = 0;
	addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM);
	cache->base = addr;
	}

	cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);

	/* We find the appropriate instance of `struct sigcontext' at a
	fixed offset in the signal frame. */
	sigcontext_addr = cache->base + 64 + 16;

	cache->saved_regs[SPARC_SP_REGNUM].addr = sigcontext_addr + 8;
	cache->saved_regs[SPARC32_PC_REGNUM].addr = sigcontext_addr + 12;
	cache->saved_regs[SPARC32_NPC_REGNUM].addr = sigcontext_addr + 16;
	cache->saved_regs[SPARC32_PSR_REGNUM].addr = sigcontext_addr + 20;
	cache->saved_regs[SPARC_G1_REGNUM].addr = sigcontext_addr + 24;
	cache->saved_regs[SPARC_O0_REGNUM].addr = sigcontext_addr + 28;

	/* The remaining `global' registers and %y are saved in the `local'
	registers. */
	delta = SPARC_L0_REGNUM - SPARC_G0_REGNUM;
	for (regnum = SPARC_G2_REGNUM; regnum <= SPARC_G7_REGNUM; regnum++)
	cache->saved_regs[regnum].realreg = regnum + delta;
	cache->saved_regs[SPARC32_Y_REGNUM].realreg = SPARC_L1_REGNUM;

	/* The remaining `out' registers can be found in the current frame's
	`in' registers. */
	delta = SPARC_I0_REGNUM - SPARC_O0_REGNUM;
	for (regnum = SPARC_O1_REGNUM; regnum <= SPARC_O5_REGNUM; regnum++)
	cache->saved_regs[regnum].realreg = regnum + delta;
	cache->saved_regs[SPARC_O7_REGNUM].realreg = SPARC_I7_REGNUM;

	/* The `local' and `in' registers have been saved in the register
	save area. */
	addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
	addr = get_frame_memory_unsigned (next_frame, addr, 4);
	for (regnum = SPARC_L0_REGNUM;
	regnum <= SPARC_I7_REGNUM; regnum++, addr += 4)
	cache->saved_regs[regnum].addr = addr;

	/* The floating-point registers are only saved if the EF bit in %prs
	has been set. */

	#define PSR_EF 0x00001000

	addr = cache->saved_regs[SPARC32_PSR_REGNUM].addr;
	psr = get_frame_memory_unsigned (next_frame, addr, 4);
	if (psr & PSR_EF)
	{
	CORE_ADDR sp;

	sp = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
	cache->saved_regs[SPARC32_FSR_REGNUM].addr = sp + 96;
	for (regnum = SPARC_F0_REGNUM, addr = sp + 96 + 8;
	regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
	cache->saved_regs[regnum].addr = addr;
	}

	return cache;
	}

	static void
	sparc32nbsd_sigcontext_frame_this_id (struct frame_info *next_frame,
	void **this_cache,
	struct frame_id *this_id)
	{
	struct sparc_frame_cache *cache =
	sparc32nbsd_sigcontext_frame_cache (next_frame, this_cache);

	(*this_id) = frame_id_build (cache->base, cache->pc);
	}

	static void
	sparc32nbsd_sigcontext_frame_prev_register (struct frame_info *next_frame,
	void **this_cache,
	int regnum, int *optimizedp,
	enum lval_type *lvalp,
	CORE_ADDR *addrp,
	int realnump, void valuep)
	{
	struct sparc_frame_cache *cache =
	sparc32nbsd_sigcontext_frame_cache (next_frame, this_cache);

	trad_frame_prev_register (next_frame, cache->saved_regs, regnum,
	optimizedp, lvalp, addrp, realnump, valuep);
	}

	static const struct frame_unwind sparc32nbsd_sigcontext_frame_unwind =
	{
	SIGTRAMP_FRAME,
	sparc32nbsd_sigcontext_frame_this_id,
	sparc32nbsd_sigcontext_frame_prev_register
	};

	static const struct frame_unwind *
	sparc32nbsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
	{
	CORE_ADDR pc = frame_pc_unwind (next_frame);
	char *name;

	find_pc_partial_function (pc, &name, NULL, NULL);
	if (sparc32nbsd_pc_in_sigtramp (pc, name))
	{
	if (name == NULL \|\| strncmp (name, "__sigtramp_sigcontext", 21))
	return &sparc32nbsd_sigcontext_frame_unwind;
	}

	return NULL;
	}


	/* Return non-zero if we are in a shared library trampoline code stub. */

	static int
	sparcnbsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name)
	{
	return (name && !strcmp (name, "_DYNAMIC"));
	}

	static void
	sparc32nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	{
	/* NetBSD doesn't support the 128-bit `long double' from the psABI. */
	set_gdbarch_long_double_bit (gdbarch, 64);
	set_gdbarch_long_double_format (gdbarch, &floatformat_ieee_double_big);

	set_gdbarch_pc_in_sigtramp (gdbarch, sparc32nbsd_pc_in_sigtramp);
	frame_unwind_append_sniffer (gdbarch, sparc32nbsd_sigtramp_frame_sniffer);
	}

	static void
	sparc32nbsd_aout_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	{
	sparc32nbsd_init_abi (info, gdbarch);

	set_gdbarch_in_solib_call_trampoline
	(gdbarch, sparcnbsd_aout_in_solib_call_trampoline);
	}

	static void
	sparc32nbsd_elf_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	{
	sparc32nbsd_init_abi (info, gdbarch);

	set_solib_svr4_fetch_link_map_offsets
	(gdbarch, nbsd_ilp32_solib_svr4_fetch_link_map_offsets);
	}

	static enum gdb_osabi
	sparcnbsd_aout_osabi_sniffer (bfd *abfd)
	{
	if (strcmp (bfd_get_target (abfd), "a.out-sparc-netbsd") == 0)
	return GDB_OSABI_NETBSD_AOUT;

	return GDB_OSABI_UNKNOWN;
	}


	/* Provide a prototype to silence -Wmissing-prototypes. */
	void _initialize_sparcnbsd_tdep (void);

	void
	_initialize_sparnbsd_tdep (void)
	{
	gdbarch_register_osabi_sniffer (bfd_arch_sparc, bfd_target_aout_flavour,
	sparcnbsd_aout_osabi_sniffer);

	gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_AOUT,
	sparc32nbsd_aout_init_abi);
	gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_NETBSD_ELF,
	sparc32nbsd_elf_init_abi);

	add_core_fns (&sparcnbsd_core_fns);
	add_core_fns (&sparcnbsd_elfcore_fns);
	}