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

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

    Copyright (C) 2003, 2004, 2005, 2007, 2008 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 "sparc64-tdep.h"

 /* Signal trampoline support.  */

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

   base = frame_unwind_register_unsigned (next_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 = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
   if (base & 1)
     base += BIAS;

   addr = get_frame_memory_unsigned (next_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)
 {
   if (insn == 0x91d0206d)
     {
       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);
     }

   return 0;
 }


 const struct sparc_gregset sparc64_linux_core_gregset =
 {
   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_gregset, 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_gregset, 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 (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 (regcache, regnum, fpregs);
 }


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

   tdep->gregset = regset_alloc (gdbarch, sparc64_linux_supply_core_gregset,
 				sparc64_linux_collect_core_gregset);
   tdep->sizeof_gregset = 288;

   tdep->fpregset = regset_alloc (gdbarch, sparc64_linux_supply_core_fpregset,
 				 sparc64_linux_collect_core_fpregset);
   tdep->sizeof_fpregset = 280;

   tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe);

   /* Hook in the DWARF CFI frame unwinder.  */
   frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);

   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;
 }


 /* 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, 2004, 2005, 2007, 2008 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 "sparc64-tdep.h"

	/* Signal trampoline support. */

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

	base = frame_unwind_register_unsigned (next_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 = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
	if (base & 1)
	base += BIAS;

	addr = get_frame_memory_unsigned (next_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)
	{
	if (insn == 0x91d0206d)
	{
	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);
	}

	return 0;
	}


	const struct sparc_gregset sparc64_linux_core_gregset =
	{
	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_gregset, 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_gregset, 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 (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 (regcache, regnum, fpregs);
	}



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

	tdep->gregset = regset_alloc (gdbarch, sparc64_linux_supply_core_gregset,
	sparc64_linux_collect_core_gregset);
	tdep->sizeof_gregset = 288;

	tdep->fpregset = regset_alloc (gdbarch, sparc64_linux_supply_core_fpregset,
	sparc64_linux_collect_core_fpregset);
	tdep->sizeof_fpregset = 280;

	tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe);

	/* Hook in the DWARF CFI frame unwinder. */
	frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);

	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;
	}


	/* 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);
	}