gdb/sparc64-fbsd-tdep.c - third_party/gdb - Git at Google

 /* Target-dependent code for FreeBSD/sparc64.

    Copyright (C) 2003-2016 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 "frame.h"
 #include "frame-unwind.h"
 #include "gdbcore.h"
 #include "osabi.h"
 #include "regcache.h"
 #include "regset.h"
 #include "target.h"
 #include "trad-frame.h"

 #include "sparc64-tdep.h"
 #include "fbsd-tdep.h"
 #include "solib-svr4.h"

 /* From <machine/reg.h>.  */
 const struct sparc_gregmap sparc64fbsd_gregmap =
 {
   26 * 8,			/* "tstate" */
   25 * 8,			/* %pc */
   24 * 8,			/* %npc */
   28 * 8,			/* %y */
   16 * 8,			/* %fprs */
   -1,
   1 * 8,			/* %g1 */
   -1,				/* %l0 */
   8				/* sizeof (%y) */
 };


 static void
 sparc64fbsd_supply_gregset (const struct regset *regset,
 			    struct regcache *regcache,
 			    int regnum, const void *gregs, size_t len)
 {
   sparc64_supply_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs);
 }

 static void
 sparc64fbsd_collect_gregset (const struct regset *regset,
 			     const struct regcache *regcache,
 			     int regnum, void *gregs, size_t len)
 {
   sparc64_collect_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs);
 }

 static void
 sparc64fbsd_supply_fpregset (const struct regset *regset,
 			     struct regcache *regcache,
 			     int regnum, const void *fpregs, size_t len)
 {
   sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
 }

 static void
 sparc64fbsd_collect_fpregset (const struct regset *regset,
 			      const struct regcache *regcache,
 			      int regnum, void *fpregs, size_t len)
 {
   sparc64_collect_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
 }


 /* Signal trampolines.  */

 static int
 sparc64fbsd_pc_in_sigtramp (CORE_ADDR pc, const char *name)
 {
   return (name && strcmp (name, "__sigtramp") == 0);
 }

 static struct sparc_frame_cache *
 sparc64fbsd_sigtramp_frame_cache (struct frame_info *this_frame,
 				   void **this_cache)
 {
   struct sparc_frame_cache *cache;
   CORE_ADDR addr, mcontext_addr, sp;
   LONGEST fprs;
   int regnum;

   if (*this_cache)
     return (struct sparc_frame_cache *) *this_cache;

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

   cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);

   /* The third argument is a pointer to an instance of `ucontext_t',
      which has a member `uc_mcontext' that contains the saved
      registers.  */
   addr = get_frame_register_unsigned (this_frame, SPARC_O2_REGNUM);
   mcontext_addr = addr + 64;

   /* The following registers travel in the `mc_local' slots of
      `mcontext_t'.  */
   addr = mcontext_addr + 16 * 8;
   cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 0 * 8;
   cache->saved_regs[SPARC64_FSR_REGNUM].addr = addr + 1 * 8;

   /* The following registers travel in the `mc_in' slots of
      `mcontext_t'.  */
   addr = mcontext_addr + 24 * 8;
   cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 0 * 8;
   cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 1 * 8;
   cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 2 * 8;
   cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 4 * 8;

   /* The `global' and `out' registers travel in the `mc_global' and
      `mc_out' slots of `mcontext_t', except for %g0.  Since %g0 is
      always zero, keep the identity encoding.  */
   for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8;
        regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
     cache->saved_regs[regnum].addr = addr;

   /* The `local' and `in' registers have been saved in the register
      save area.  */
   addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
   sp = get_frame_memory_unsigned (this_frame, addr, 8);
   for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
        regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
     cache->saved_regs[regnum].addr = addr;

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

 #define FPRS_FEF	(1 << 2)

   addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr;
   fprs = get_frame_memory_unsigned (this_frame, addr, 8);
   if (fprs & FPRS_FEF)
     {
       for (regnum = SPARC_F0_REGNUM, addr = mcontext_addr + 32 * 8;
 	   regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
 	cache->saved_regs[regnum].addr = addr;

       for (regnum = SPARC64_F32_REGNUM;
 	   regnum <= SPARC64_F62_REGNUM; regnum++, addr += 8)
 	cache->saved_regs[regnum].addr = addr;
     }

   return cache;
 }

 static void
 sparc64fbsd_sigtramp_frame_this_id (struct frame_info *this_frame,
 				    void **this_cache,
 				    struct frame_id *this_id)
 {
   struct sparc_frame_cache *cache =
     sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);

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

 static struct value *
 sparc64fbsd_sigtramp_frame_prev_register (struct frame_info *this_frame,
 					  void **this_cache, int regnum)
 {
   struct sparc_frame_cache *cache =
     sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);

   return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
 }

 static int
 sparc64fbsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
 				    struct frame_info *this_frame,
 				    void **this_cache)
 {
   CORE_ADDR pc = get_frame_pc (this_frame);
   const char *name;

   find_pc_partial_function (pc, &name, NULL, NULL);
   if (sparc64fbsd_pc_in_sigtramp (pc, name))
     return 1;

   return 0;
 }

 static const struct frame_unwind sparc64fbsd_sigtramp_frame_unwind =
 {
   SIGTRAMP_FRAME,
   default_frame_unwind_stop_reason,
   sparc64fbsd_sigtramp_frame_this_id,
   sparc64fbsd_sigtramp_frame_prev_register,
   NULL,
   sparc64fbsd_sigtramp_frame_sniffer
 };


 static const struct regset sparc64fbsd_gregset =
   {
     NULL, sparc64fbsd_supply_gregset, sparc64fbsd_collect_gregset
   };

 static const struct regset sparc64fbsd_fpregset =
   {
     NULL, sparc64fbsd_supply_fpregset, sparc64fbsd_collect_fpregset
   };

 static void
 sparc64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

   /* Generic FreeBSD support. */
   fbsd_init_abi (info, gdbarch);

   tdep->gregset = &sparc64fbsd_gregset;
   tdep->sizeof_gregset = 256;

   tdep->fpregset = &sparc64fbsd_fpregset;
   tdep->sizeof_fpregset = 272;

   frame_unwind_append_unwinder (gdbarch, &sparc64fbsd_sigtramp_frame_unwind);

   sparc64_init_abi (info, gdbarch);

   /* FreeBSD/sparc64 has SVR4-style shared libraries.  */
   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
   set_solib_svr4_fetch_link_map_offsets
     (gdbarch, svr4_lp64_fetch_link_map_offsets);
 }

 /* Provide a prototype to silence -Wmissing-prototypes.  */
 void _initialize_sparc64fbsd_tdep (void);

 void
 _initialize_sparc64fbsd_tdep (void)
 {
   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 			  GDB_OSABI_FREEBSD_ELF, sparc64fbsd_init_abi);
 }
	/* Target-dependent code for FreeBSD/sparc64.

	Copyright (C) 2003-2016 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 "frame.h"
	#include "frame-unwind.h"
	#include "gdbcore.h"
	#include "osabi.h"
	#include "regcache.h"
	#include "regset.h"
	#include "target.h"
	#include "trad-frame.h"

	#include "sparc64-tdep.h"
	#include "fbsd-tdep.h"
	#include "solib-svr4.h"

	/* From <machine/reg.h>. */
	const struct sparc_gregmap sparc64fbsd_gregmap =
	{
	26 * 8, /* "tstate" */
	25 * 8, /* %pc */
	24 * 8, /* %npc */
	28 * 8, /* %y */
	16 * 8, /* %fprs */
	-1,
	1 * 8, /* %g1 */
	-1, /* %l0 */
	8 /* sizeof (%y) */
	};


	static void
	sparc64fbsd_supply_gregset (const struct regset *regset,
	struct regcache *regcache,
	int regnum, const void *gregs, size_t len)
	{
	sparc64_supply_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs);
	}

	static void
	sparc64fbsd_collect_gregset (const struct regset *regset,
	const struct regcache *regcache,
	int regnum, void *gregs, size_t len)
	{
	sparc64_collect_gregset (&sparc64fbsd_gregmap, regcache, regnum, gregs);
	}

	static void
	sparc64fbsd_supply_fpregset (const struct regset *regset,
	struct regcache *regcache,
	int regnum, const void *fpregs, size_t len)
	{
	sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
	}

	static void
	sparc64fbsd_collect_fpregset (const struct regset *regset,
	const struct regcache *regcache,
	int regnum, void *fpregs, size_t len)
	{
	sparc64_collect_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
	}


	/* Signal trampolines. */

	static int
	sparc64fbsd_pc_in_sigtramp (CORE_ADDR pc, const char *name)
	{
	return (name && strcmp (name, "__sigtramp") == 0);
	}

	static struct sparc_frame_cache *
	sparc64fbsd_sigtramp_frame_cache (struct frame_info *this_frame,
	void **this_cache)
	{
	struct sparc_frame_cache *cache;
	CORE_ADDR addr, mcontext_addr, sp;
	LONGEST fprs;
	int regnum;

	if (*this_cache)
	return (struct sparc_frame_cache ) this_cache;

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

	cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);

	/* The third argument is a pointer to an instance of `ucontext_t',
	which has a member `uc_mcontext' that contains the saved
	registers. */
	addr = get_frame_register_unsigned (this_frame, SPARC_O2_REGNUM);
	mcontext_addr = addr + 64;

	/* The following registers travel in the `mc_local' slots of
	`mcontext_t'. */
	addr = mcontext_addr + 16 * 8;
	cache->saved_regs[SPARC64_FPRS_REGNUM].addr = addr + 0 * 8;
	cache->saved_regs[SPARC64_FSR_REGNUM].addr = addr + 1 * 8;

	/* The following registers travel in the `mc_in' slots of
	`mcontext_t'. */
	addr = mcontext_addr + 24 * 8;
	cache->saved_regs[SPARC64_NPC_REGNUM].addr = addr + 0 * 8;
	cache->saved_regs[SPARC64_PC_REGNUM].addr = addr + 1 * 8;
	cache->saved_regs[SPARC64_STATE_REGNUM].addr = addr + 2 * 8;
	cache->saved_regs[SPARC64_Y_REGNUM].addr = addr + 4 * 8;

	/* The `global' and `out' registers travel in the `mc_global' and
	`mc_out' slots of `mcontext_t', except for %g0. Since %g0 is
	always zero, keep the identity encoding. */
	for (regnum = SPARC_G1_REGNUM, addr = mcontext_addr + 8;
	regnum <= SPARC_O7_REGNUM; regnum++, addr += 8)
	cache->saved_regs[regnum].addr = addr;

	/* The `local' and `in' registers have been saved in the register
	save area. */
	addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
	sp = get_frame_memory_unsigned (this_frame, addr, 8);
	for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
	regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
	cache->saved_regs[regnum].addr = addr;

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

	#define FPRS_FEF (1 << 2)

	addr = cache->saved_regs[SPARC64_FPRS_REGNUM].addr;
	fprs = get_frame_memory_unsigned (this_frame, addr, 8);
	if (fprs & FPRS_FEF)
	{
	for (regnum = SPARC_F0_REGNUM, addr = mcontext_addr + 32 * 8;
	regnum <= SPARC_F31_REGNUM; regnum++, addr += 4)
	cache->saved_regs[regnum].addr = addr;

	for (regnum = SPARC64_F32_REGNUM;
	regnum <= SPARC64_F62_REGNUM; regnum++, addr += 8)
	cache->saved_regs[regnum].addr = addr;
	}

	return cache;
	}

	static void
	sparc64fbsd_sigtramp_frame_this_id (struct frame_info *this_frame,
	void **this_cache,
	struct frame_id *this_id)
	{
	struct sparc_frame_cache *cache =
	sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);

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

	static struct value *
	sparc64fbsd_sigtramp_frame_prev_register (struct frame_info *this_frame,
	void **this_cache, int regnum)
	{
	struct sparc_frame_cache *cache =
	sparc64fbsd_sigtramp_frame_cache (this_frame, this_cache);

	return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
	}

	static int
	sparc64fbsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
	struct frame_info *this_frame,
	void **this_cache)
	{
	CORE_ADDR pc = get_frame_pc (this_frame);
	const char *name;

	find_pc_partial_function (pc, &name, NULL, NULL);
	if (sparc64fbsd_pc_in_sigtramp (pc, name))
	return 1;

	return 0;
	}

	static const struct frame_unwind sparc64fbsd_sigtramp_frame_unwind =
	{
	SIGTRAMP_FRAME,
	default_frame_unwind_stop_reason,
	sparc64fbsd_sigtramp_frame_this_id,
	sparc64fbsd_sigtramp_frame_prev_register,
	NULL,
	sparc64fbsd_sigtramp_frame_sniffer
	};


	static const struct regset sparc64fbsd_gregset =
	{
	NULL, sparc64fbsd_supply_gregset, sparc64fbsd_collect_gregset
	};

	static const struct regset sparc64fbsd_fpregset =
	{
	NULL, sparc64fbsd_supply_fpregset, sparc64fbsd_collect_fpregset
	};

	static void
	sparc64fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	{
	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

	/* Generic FreeBSD support. */
	fbsd_init_abi (info, gdbarch);

	tdep->gregset = &sparc64fbsd_gregset;
	tdep->sizeof_gregset = 256;

	tdep->fpregset = &sparc64fbsd_fpregset;
	tdep->sizeof_fpregset = 272;

	frame_unwind_append_unwinder (gdbarch, &sparc64fbsd_sigtramp_frame_unwind);

	sparc64_init_abi (info, gdbarch);

	/* FreeBSD/sparc64 has SVR4-style shared libraries. */
	set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
	set_solib_svr4_fetch_link_map_offsets
	(gdbarch, svr4_lp64_fetch_link_map_offsets);
	}

	/* Provide a prototype to silence -Wmissing-prototypes. */
	void _initialize_sparc64fbsd_tdep (void);

	void
	_initialize_sparc64fbsd_tdep (void)
	{
	gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
	GDB_OSABI_FREEBSD_ELF, sparc64fbsd_init_abi);
	}