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

 /* Target-dependent code for GNU/Linux UltraSPARC.

    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 "dwarf2-frame.h"
 #include "regset.h"
 #include "regcache.h"
 #include "gdbarch.h"
 #include "gdbcore.h"
 #include "osabi.h"
 #include "solib-svr4.h"
 #include "symtab.h"
 #include "trad-frame.h"
 #include "tramp-frame.h"
 #include "xml-syscall.h"
 #include "linux-tdep.h"

 /* The syscall's XML filename for sparc 64-bit.  */
 #define XML_SYSCALL_FILENAME_SPARC64 "syscalls/sparc64-linux.xml"

 #include "sparc64-tdep.h"

 /* Signal trampoline support.  */

 static void sparc64_linux_sigframe_init (const struct tramp_frame *self,
 					 struct frame_info *this_frame,
 					 struct trad_frame_cache *this_cache,
 					 CORE_ADDR func);

 /* See sparc-linux-tdep.c for details.  Note that 64-bit binaries only
    use RT signals.  */

 static const struct tramp_frame sparc64_linux_rt_sigframe =
 {
   SIGTRAMP_FRAME,
   4,
   {
     { 0x82102065, -1 },		/* mov __NR_rt_sigreturn, %g1 */
     { 0x91d0206d, -1 },		/* ta  0x6d */
     { TRAMP_SENTINEL_INSN, -1 }
   },
   sparc64_linux_sigframe_init
 };

 static void
 sparc64_linux_sigframe_init (const struct tramp_frame *self,
 			     struct frame_info *this_frame,
 			     struct trad_frame_cache *this_cache,
 			     CORE_ADDR func)
 {
   CORE_ADDR base, addr, sp_addr;
   int regnum;

   base = get_frame_register_unsigned (this_frame, SPARC_O1_REGNUM);
   base += 128;

   /* Offsets from <bits/sigcontext.h>.  */

   /* Since %g0 is always zero, keep the identity encoding.  */
   addr = base + 8;
   sp_addr = base + ((SPARC_SP_REGNUM - SPARC_G0_REGNUM) * 8);
   for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++)
     {
       trad_frame_set_reg_addr (this_cache, regnum, addr);
       addr += 8;
     }

   trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0);
   trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM, addr + 8);
   trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM, addr + 16);
   trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 24);
   trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 28);

   base = get_frame_register_unsigned (this_frame, SPARC_SP_REGNUM);
   if (base & 1)
     base += BIAS;

   addr = get_frame_memory_unsigned (this_frame, sp_addr, 8);
   if (addr & 1)
     addr += BIAS;

   for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
     {
       trad_frame_set_reg_addr (this_cache, regnum, addr);
       addr += 8;
     }
   trad_frame_set_id (this_cache, frame_id_build (base, func));
 }

 /* Return the address of a system call's alternative return
    address.  */

 static CORE_ADDR
 sparc64_linux_step_trap (struct frame_info *frame, unsigned long insn)
 {
   /* __NR_rt_sigreturn is 101  */
   if ((insn == 0x91d0206d)
       && (get_frame_register_unsigned (frame, SPARC_G1_REGNUM) == 101))
     {
       struct gdbarch *gdbarch = get_frame_arch (frame);
       enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

       ULONGEST sp = get_frame_register_unsigned (frame, SPARC_SP_REGNUM);
       if (sp & 1)
 	sp += BIAS;

       /* The kernel puts the sigreturn registers on the stack,
 	 and this is where the signal unwinding state is take from
 	 when returning from a signal.

 	 A siginfo_t sits 192 bytes from the base of the stack.  This
 	 siginfo_t is 128 bytes, and is followed by the sigreturn
 	 register save area.  The saved PC sits at a 136 byte offset
 	 into there.  */

       return read_memory_unsigned_integer (sp + 192 + 128 + 136,
 					   8, byte_order);
     }

   return 0;
 }


 const struct sparc_gregmap sparc64_linux_core_gregmap =
 {
   32 * 8,			/* %tstate */
   33 * 8,			/* %tpc */
   34 * 8,			/* %tnpc */
   35 * 8,			/* %y */
   -1,				/* %wim */
   -1,				/* %tbr */
   1 * 8,			/* %g1 */
   16 * 8,			/* %l0 */
   8,				/* y size */
 };


 static void
 sparc64_linux_supply_core_gregset (const struct regset *regset,
 				   struct regcache *regcache,
 				   int regnum, const void *gregs, size_t len)
 {
   sparc64_supply_gregset (&sparc64_linux_core_gregmap,
 			  regcache, regnum, gregs);
 }

 static void
 sparc64_linux_collect_core_gregset (const struct regset *regset,
 				    const struct regcache *regcache,
 				    int regnum, void *gregs, size_t len)
 {
   sparc64_collect_gregset (&sparc64_linux_core_gregmap,
 			   regcache, regnum, gregs);
 }

 static void
 sparc64_linux_supply_core_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
 sparc64_linux_collect_core_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);
 }

 /* Set the program counter for process PTID to PC.  */

 #define TSTATE_SYSCALL	0x0000000000000020ULL

 static void
 sparc64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
   ULONGEST state;

   regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc);
   regcache_cooked_write_unsigned (regcache, tdep->npc_regnum, pc + 4);

   /* Clear the "in syscall" bit to prevent the kernel from
      messing with the PCs we just installed, if we happen to be
      within an interrupted system call that the kernel wants to
      restart.

      Note that after we return from the dummy call, the TSTATE et al.
      registers will be automatically restored, and the kernel
      continues to restart the system call at this point.  */
   regcache_cooked_read_unsigned (regcache, SPARC64_STATE_REGNUM, &state);
   state &= ~TSTATE_SYSCALL;
   regcache_cooked_write_unsigned (regcache, SPARC64_STATE_REGNUM, state);
 }

 static LONGEST
 sparc64_linux_get_syscall_number (struct gdbarch *gdbarch,
 				  ptid_t ptid)
 {
   struct regcache *regcache = get_thread_regcache (ptid);
   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
   /* The content of a register.  */
   gdb_byte buf[8];
   /* The result.  */
   LONGEST ret;

   /* Getting the system call number from the register.
      When dealing with the sparc architecture, this information
      is stored at the %g1 register.  */
   regcache_cooked_read (regcache, SPARC_G1_REGNUM, buf);

   ret = extract_signed_integer (buf, 8, byte_order);

   return ret;
 }


 /* Implement the "get_longjmp_target" gdbarch method.  */

 static int
 sparc64_linux_get_longjmp_target (struct frame_info *frame, CORE_ADDR *pc)
 {
   struct gdbarch *gdbarch = get_frame_arch (frame);
   CORE_ADDR jb_addr;
   gdb_byte buf[8];

   jb_addr = get_frame_register_unsigned (frame, SPARC_O0_REGNUM);

   /* setjmp and longjmp in SPARC64 are implemented in glibc using the
      setcontext and getcontext system calls respectively.  These
      system calls operate on ucontext_t structures, which happen to
      partially have the same structure than jmp_buf.  However the
      ucontext returned by getcontext, and thus the jmp_buf structure
      returned by setjmp, contains the context of the trap instruction
      in the glibc __[sig]setjmp wrapper, not the context of the user
      code calling setjmp.

      %o7 in the jmp_buf structure is stored at offset 18*8 in the
      mc_gregs array, which is itself located at offset 32 into
      jmp_buf.  See bits/setjmp.h.  This register contains the address
      of the 'call setjmp' instruction in user code.

      In order to determine the longjmp target address in the
      initiating frame we need to examine the call instruction itself,
      in particular whether the annul bit is set.  If it is not set
      then we need to jump over the instruction at the delay slot.  */

   if (target_read_memory (jb_addr + 32 + (18 * 8), buf, 8))
     return 0;

   *pc = extract_unsigned_integer (buf, 8, gdbarch_byte_order (gdbarch));

   if (!sparc_is_annulled_branch_insn (*pc))
       *pc += 4; /* delay slot insn  */
   *pc += 4; /* call insn  */

   return 1;
 }


 static const struct regset sparc64_linux_gregset =
   {
     NULL,
     sparc64_linux_supply_core_gregset,
     sparc64_linux_collect_core_gregset
   };

 static const struct regset sparc64_linux_fpregset =
   {
     NULL,
     sparc64_linux_supply_core_fpregset,
     sparc64_linux_collect_core_fpregset
   };

 static void
 sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

   linux_init_abi (info, gdbarch);

   tdep->gregset = &sparc64_linux_gregset;
   tdep->sizeof_gregset = 288;

   tdep->fpregset = &sparc64_linux_fpregset;
   tdep->sizeof_fpregset = 280;

   tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe);

   /* Hook in the DWARF CFI frame unwinder.  */
   dwarf2_append_unwinders (gdbarch);

   sparc64_init_abi (info, gdbarch);

   /* GNU/Linux 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);

   /* ...which means that we need some special handling when doing
      prologue analysis.  */
   tdep->plt_entry_size = 16;

   /* Enable TLS support.  */
   set_gdbarch_fetch_tls_load_module_address (gdbarch,
                                              svr4_fetch_objfile_link_map);

   /* Make sure we can single-step over signal return system calls.  */
   tdep->step_trap = sparc64_linux_step_trap;

   /* Make sure we can single-step over longjmp calls.  */
   set_gdbarch_get_longjmp_target (gdbarch, sparc64_linux_get_longjmp_target);

   set_gdbarch_write_pc (gdbarch, sparc64_linux_write_pc);

   /* Functions for 'catch syscall'.  */
   set_xml_syscall_file_name (gdbarch, XML_SYSCALL_FILENAME_SPARC64);
   set_gdbarch_get_syscall_number (gdbarch,
                                   sparc64_linux_get_syscall_number);
 }


 /* Provide a prototype to silence -Wmissing-prototypes.  */
 extern void _initialize_sparc64_linux_tdep (void);

 void
 _initialize_sparc64_linux_tdep (void)
 {
   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 			  GDB_OSABI_LINUX, sparc64_linux_init_abi);
 }
	/* Target-dependent code for GNU/Linux UltraSPARC.

	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 "dwarf2-frame.h"
	#include "regset.h"
	#include "regcache.h"
	#include "gdbarch.h"
	#include "gdbcore.h"
	#include "osabi.h"
	#include "solib-svr4.h"
	#include "symtab.h"
	#include "trad-frame.h"
	#include "tramp-frame.h"
	#include "xml-syscall.h"
	#include "linux-tdep.h"

	/* The syscall's XML filename for sparc 64-bit. */
	#define XML_SYSCALL_FILENAME_SPARC64 "syscalls/sparc64-linux.xml"

	#include "sparc64-tdep.h"

	/* Signal trampoline support. */

	static void sparc64_linux_sigframe_init (const struct tramp_frame *self,
	struct frame_info *this_frame,
	struct trad_frame_cache *this_cache,
	CORE_ADDR func);

	/* See sparc-linux-tdep.c for details. Note that 64-bit binaries only
	use RT signals. */

	static const struct tramp_frame sparc64_linux_rt_sigframe =
	{
	SIGTRAMP_FRAME,
	4,
	{
	{ 0x82102065, -1 }, /* mov __NR_rt_sigreturn, %g1 */
	{ 0x91d0206d, -1 }, /* ta 0x6d */
	{ TRAMP_SENTINEL_INSN, -1 }
	},
	sparc64_linux_sigframe_init
	};

	static void
	sparc64_linux_sigframe_init (const struct tramp_frame *self,
	struct frame_info *this_frame,
	struct trad_frame_cache *this_cache,
	CORE_ADDR func)
	{
	CORE_ADDR base, addr, sp_addr;
	int regnum;

	base = get_frame_register_unsigned (this_frame, SPARC_O1_REGNUM);
	base += 128;

	/* Offsets from <bits/sigcontext.h>. */

	/* Since %g0 is always zero, keep the identity encoding. */
	addr = base + 8;
	sp_addr = base + ((SPARC_SP_REGNUM - SPARC_G0_REGNUM) * 8);
	for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++)
	{
	trad_frame_set_reg_addr (this_cache, regnum, addr);
	addr += 8;
	}

	trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0);
	trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM, addr + 8);
	trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM, addr + 16);
	trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 24);
	trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 28);

	base = get_frame_register_unsigned (this_frame, SPARC_SP_REGNUM);
	if (base & 1)
	base += BIAS;

	addr = get_frame_memory_unsigned (this_frame, sp_addr, 8);
	if (addr & 1)
	addr += BIAS;

	for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
	{
	trad_frame_set_reg_addr (this_cache, regnum, addr);
	addr += 8;
	}
	trad_frame_set_id (this_cache, frame_id_build (base, func));
	}

	/* Return the address of a system call's alternative return
	address. */

	static CORE_ADDR
	sparc64_linux_step_trap (struct frame_info *frame, unsigned long insn)
	{
	/* __NR_rt_sigreturn is 101 */
	if ((insn == 0x91d0206d)
	&& (get_frame_register_unsigned (frame, SPARC_G1_REGNUM) == 101))
	{
	struct gdbarch *gdbarch = get_frame_arch (frame);
	enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);

	ULONGEST sp = get_frame_register_unsigned (frame, SPARC_SP_REGNUM);
	if (sp & 1)
	sp += BIAS;

	/* The kernel puts the sigreturn registers on the stack,
	and this is where the signal unwinding state is take from
	when returning from a signal.

	A siginfo_t sits 192 bytes from the base of the stack. This
	siginfo_t is 128 bytes, and is followed by the sigreturn
	register save area. The saved PC sits at a 136 byte offset
	into there. */

	return read_memory_unsigned_integer (sp + 192 + 128 + 136,
	8, byte_order);
	}

	return 0;
	}


	const struct sparc_gregmap sparc64_linux_core_gregmap =
	{
	32 * 8, /* %tstate */
	33 * 8, /* %tpc */
	34 * 8, /* %tnpc */
	35 * 8, /* %y */
	-1, /* %wim */
	-1, /* %tbr */
	1 * 8, /* %g1 */
	16 * 8, /* %l0 */
	8, /* y size */
	};


	static void
	sparc64_linux_supply_core_gregset (const struct regset *regset,
	struct regcache *regcache,
	int regnum, const void *gregs, size_t len)
	{
	sparc64_supply_gregset (&sparc64_linux_core_gregmap,
	regcache, regnum, gregs);
	}

	static void
	sparc64_linux_collect_core_gregset (const struct regset *regset,
	const struct regcache *regcache,
	int regnum, void *gregs, size_t len)
	{
	sparc64_collect_gregset (&sparc64_linux_core_gregmap,
	regcache, regnum, gregs);
	}

	static void
	sparc64_linux_supply_core_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
	sparc64_linux_collect_core_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);
	}

	/* Set the program counter for process PTID to PC. */

	#define TSTATE_SYSCALL 0x0000000000000020ULL

	static void
	sparc64_linux_write_pc (struct regcache *regcache, CORE_ADDR pc)
	{
	struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
	ULONGEST state;

	regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc);
	regcache_cooked_write_unsigned (regcache, tdep->npc_regnum, pc + 4);

	/* Clear the "in syscall" bit to prevent the kernel from
	messing with the PCs we just installed, if we happen to be
	within an interrupted system call that the kernel wants to
	restart.

	Note that after we return from the dummy call, the TSTATE et al.
	registers will be automatically restored, and the kernel
	continues to restart the system call at this point. */
	regcache_cooked_read_unsigned (regcache, SPARC64_STATE_REGNUM, &state);
	state &= ~TSTATE_SYSCALL;
	regcache_cooked_write_unsigned (regcache, SPARC64_STATE_REGNUM, state);
	}

	static LONGEST
	sparc64_linux_get_syscall_number (struct gdbarch *gdbarch,
	ptid_t ptid)
	{
	struct regcache *regcache = get_thread_regcache (ptid);
	enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
	/* The content of a register. */
	gdb_byte buf[8];
	/* The result. */
	LONGEST ret;

	/* Getting the system call number from the register.
	When dealing with the sparc architecture, this information
	is stored at the %g1 register. */
	regcache_cooked_read (regcache, SPARC_G1_REGNUM, buf);

	ret = extract_signed_integer (buf, 8, byte_order);

	return ret;
	}


	/* Implement the "get_longjmp_target" gdbarch method. */

	static int
	sparc64_linux_get_longjmp_target (struct frame_info frame, CORE_ADDR pc)
	{
	struct gdbarch *gdbarch = get_frame_arch (frame);
	CORE_ADDR jb_addr;
	gdb_byte buf[8];

	jb_addr = get_frame_register_unsigned (frame, SPARC_O0_REGNUM);

	/* setjmp and longjmp in SPARC64 are implemented in glibc using the
	setcontext and getcontext system calls respectively. These
	system calls operate on ucontext_t structures, which happen to
	partially have the same structure than jmp_buf. However the
	ucontext returned by getcontext, and thus the jmp_buf structure
	returned by setjmp, contains the context of the trap instruction
	in the glibc __[sig]setjmp wrapper, not the context of the user
	code calling setjmp.

	%o7 in the jmp_buf structure is stored at offset 18*8 in the
	mc_gregs array, which is itself located at offset 32 into
	jmp_buf. See bits/setjmp.h. This register contains the address
	of the 'call setjmp' instruction in user code.

	In order to determine the longjmp target address in the
	initiating frame we need to examine the call instruction itself,
	in particular whether the annul bit is set. If it is not set
	then we need to jump over the instruction at the delay slot. */

	if (target_read_memory (jb_addr + 32 + (18 * 8), buf, 8))
	return 0;

	*pc = extract_unsigned_integer (buf, 8, gdbarch_byte_order (gdbarch));

	if (!sparc_is_annulled_branch_insn (*pc))
	pc += 4; / delay slot insn */
	pc += 4; / call insn */

	return 1;
	}



	static const struct regset sparc64_linux_gregset =
	{
	NULL,
	sparc64_linux_supply_core_gregset,
	sparc64_linux_collect_core_gregset
	};

	static const struct regset sparc64_linux_fpregset =
	{
	NULL,
	sparc64_linux_supply_core_fpregset,
	sparc64_linux_collect_core_fpregset
	};

	static void
	sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	{
	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);

	linux_init_abi (info, gdbarch);

	tdep->gregset = &sparc64_linux_gregset;
	tdep->sizeof_gregset = 288;

	tdep->fpregset = &sparc64_linux_fpregset;
	tdep->sizeof_fpregset = 280;

	tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe);

	/* Hook in the DWARF CFI frame unwinder. */
	dwarf2_append_unwinders (gdbarch);

	sparc64_init_abi (info, gdbarch);

	/* GNU/Linux 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);

	/* ...which means that we need some special handling when doing
	prologue analysis. */
	tdep->plt_entry_size = 16;

	/* Enable TLS support. */
	set_gdbarch_fetch_tls_load_module_address (gdbarch,
	svr4_fetch_objfile_link_map);

	/* Make sure we can single-step over signal return system calls. */
	tdep->step_trap = sparc64_linux_step_trap;

	/* Make sure we can single-step over longjmp calls. */
	set_gdbarch_get_longjmp_target (gdbarch, sparc64_linux_get_longjmp_target);

	set_gdbarch_write_pc (gdbarch, sparc64_linux_write_pc);

	/* Functions for 'catch syscall'. */
	set_xml_syscall_file_name (gdbarch, XML_SYSCALL_FILENAME_SPARC64);
	set_gdbarch_get_syscall_number (gdbarch,
	sparc64_linux_get_syscall_number);
	}


	/* Provide a prototype to silence -Wmissing-prototypes. */
	extern void _initialize_sparc64_linux_tdep (void);

	void
	_initialize_sparc64_linux_tdep (void)
	{
	gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
	GDB_OSABI_LINUX, sparc64_linux_init_abi);
	}