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

 /* Target-dependent code for NetBSD/sparc64.

    Copyright (C) 2002-2025 Free Software Foundation, Inc.
    Based on code 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 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 "frame.h"
 #include "frame-unwind.h"
 #include "gdbcore.h"
 #include "osabi.h"
 #include "regcache.h"
 #include "regset.h"
 #include "symtab.h"
 #include "objfiles.h"
 #include "solib-svr4.h"
 #include "trad-frame.h"

 #include "sparc64-tdep.h"
 #include "netbsd-tdep.h"

 /* From <machine/reg.h>.  */
 const struct sparc_gregmap sparc64nbsd_gregmap =
 {
   0 * 8,			/* "tstate" */
   1 * 8,			/* %pc */
   2 * 8,			/* %npc */
   3 * 8,			/* %y */
   -1,				/* %fprs */
   -1,
   5 * 8,			/* %g1 */
   -1,				/* %l0 */
   4				/* sizeof (%y) */
 };


 static void
 sparc64nbsd_supply_gregset (const struct regset *regset,
 			    struct regcache *regcache,
 			    int regnum, const void *gregs, size_t len)
 {
   sparc64_supply_gregset (&sparc64nbsd_gregmap, regcache, regnum, gregs);
 }

 static void
 sparc64nbsd_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);
 }


 /* 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 sparc64nbsd_sigtramp_start = 0xffffffffffffdee4ULL;
 static const CORE_ADDR sparc64nbsd_sigtramp_end = 0xffffffffffffe000ULL;

 static int
 sparc64nbsd_pc_in_sigtramp (CORE_ADDR pc, const char *name)
 {
   if (pc >= sparc64nbsd_sigtramp_start && pc < sparc64nbsd_sigtramp_end)
     return 1;

   return nbsd_pc_in_sigtramp (pc, name);
 }

 trad_frame_saved_reg *
 sparc64nbsd_sigcontext_saved_regs (CORE_ADDR sigcontext_addr,
 				   const frame_info_ptr &this_frame)
 {
   struct gdbarch *gdbarch = get_frame_arch (this_frame);
   trad_frame_saved_reg *saved_regs;
   CORE_ADDR addr, sp;
   int regnum, delta;

   saved_regs = trad_frame_alloc_saved_regs (this_frame);

   /* 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.  */

   saved_regs[SPARC_SP_REGNUM].set_addr (sigcontext_addr + 8);
   saved_regs[SPARC64_PC_REGNUM].set_addr (sigcontext_addr + 16);
   saved_regs[SPARC64_NPC_REGNUM].set_addr (sigcontext_addr + 24);
   saved_regs[SPARC64_STATE_REGNUM].set_addr (sigcontext_addr + 32);
   saved_regs[SPARC_G1_REGNUM].set_addr (sigcontext_addr + 40);
   saved_regs[SPARC_O0_REGNUM].set_addr (sigcontext_addr + 48);

   /* 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++)
     saved_regs[regnum].set_realreg (regnum + delta);
   saved_regs[SPARC64_Y_REGNUM].set_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++)
     saved_regs[regnum].set_realreg (regnum + delta);
   saved_regs[SPARC_O7_REGNUM].set_realreg (SPARC_I7_REGNUM);

   /* The `local' and `in' registers have been saved in the register
      save area.  */
   addr = 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)
     saved_regs[regnum].set_addr (addr);

   /* Handle StackGhost.  */
   {
     ULONGEST wcookie = sparc_fetch_wcookie (gdbarch);

     if (wcookie != 0)
       {
 	ULONGEST i7;

 	addr = saved_regs[SPARC_I7_REGNUM].addr ();
 	i7 = get_frame_memory_unsigned (this_frame, addr, 8);
 	saved_regs[SPARC_I7_REGNUM].set_value (i7 ^ wcookie);
       }
   }

   /* TODO: Handle the floating-point registers.  */

   return saved_regs;
 }

 static struct sparc_frame_cache *
 sparc64nbsd_sigcontext_frame_cache (const frame_info_ptr &this_frame,
 				    void **this_cache)
 {
   struct sparc_frame_cache *cache;
   CORE_ADDR addr;

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

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

   /* 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 = sparc64nbsd_sigtramp_start;

       /* Since we couldn't find the frame's function, the cache was
 	 initialized under the assumption that we're frameless.  */
       sparc_record_save_insn (cache);
       addr = get_frame_register_unsigned (this_frame, SPARC_FP_REGNUM);
       if (addr & 1)
 	addr += BIAS;
       cache->base = addr;
     }

   /* We find the appropriate instance of `struct sigcontext' at a
      fixed offset in the signal frame.  */
   addr = cache->base + 128 + 8;
   cache->saved_regs = sparc64nbsd_sigcontext_saved_regs (addr, this_frame);

   return cache;
 }

 static void
 sparc64nbsd_sigcontext_frame_this_id (const frame_info_ptr &this_frame,
 				      void **this_cache,
 				      struct frame_id *this_id)
 {
   struct sparc_frame_cache *cache =
     sparc64nbsd_sigcontext_frame_cache (this_frame, this_cache);

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

 static struct value *
 sparc64nbsd_sigcontext_frame_prev_register (const frame_info_ptr &this_frame,
 					    void **this_cache, int regnum)
 {
   struct sparc_frame_cache *cache =
     sparc64nbsd_sigcontext_frame_cache (this_frame, this_cache);

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

 static int
 sparc64nbsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
 				    const frame_info_ptr &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 (sparc64nbsd_pc_in_sigtramp (pc, name))
     {
       if (name == NULL || !startswith (name, "__sigtramp_sigcontext"))
 	return 1;
     }

   return 0;
 }

 static const struct frame_unwind_legacy sparc64nbsd_sigcontext_frame_unwind (
   "sparc64 netbsd sigcontext",
   SIGTRAMP_FRAME,
   FRAME_UNWIND_ARCH,
   default_frame_unwind_stop_reason,
   sparc64nbsd_sigcontext_frame_this_id,
   sparc64nbsd_sigcontext_frame_prev_register,
   NULL,
   sparc64nbsd_sigtramp_frame_sniffer
 );


 static const struct regset sparc64nbsd_gregset =
   {
     NULL, sparc64nbsd_supply_gregset, NULL
   };

 static const struct regset sparc64nbsd_fpregset =
   {
     NULL, sparc64nbsd_supply_fpregset, NULL
   };

 static void
 sparc64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
   sparc_gdbarch_tdep *tdep = gdbarch_tdep<sparc_gdbarch_tdep> (gdbarch);

   nbsd_init_abi (info, gdbarch);

   tdep->gregset = &sparc64nbsd_gregset;
   tdep->sizeof_gregset = 160;

   tdep->fpregset =  &sparc64nbsd_fpregset;
   tdep->sizeof_fpregset = 272;

   /* Make sure we can single-step "new" syscalls.  */
   tdep->step_trap = sparcnbsd_step_trap;

   frame_unwind_append_unwinder (gdbarch, &sparc64nbsd_sigcontext_frame_unwind);

   sparc64_init_abi (info, gdbarch);

   /* NetBSD/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);
 }

 void _initialize_sparc64nbsd_tdep ();
 void
 _initialize_sparc64nbsd_tdep ()
 {
   gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
 			  GDB_OSABI_NETBSD, sparc64nbsd_init_abi);
 }
	/* Target-dependent code for NetBSD/sparc64.

	Copyright (C) 2002-2025 Free Software Foundation, Inc.
	Based on code 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 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 "frame.h"
	#include "frame-unwind.h"
	#include "gdbcore.h"
	#include "osabi.h"
	#include "regcache.h"
	#include "regset.h"
	#include "symtab.h"
	#include "objfiles.h"
	#include "solib-svr4.h"
	#include "trad-frame.h"

	#include "sparc64-tdep.h"
	#include "netbsd-tdep.h"

	/* From <machine/reg.h>. */
	const struct sparc_gregmap sparc64nbsd_gregmap =
	{
	0 * 8, /* "tstate" */
	1 * 8, /* %pc */
	2 * 8, /* %npc */
	3 * 8, /* %y */
	-1, /* %fprs */
	-1,
	5 * 8, /* %g1 */
	-1, /* %l0 */
	4 /* sizeof (%y) */
	};


	static void
	sparc64nbsd_supply_gregset (const struct regset *regset,
	struct regcache *regcache,
	int regnum, const void *gregs, size_t len)
	{
	sparc64_supply_gregset (&sparc64nbsd_gregmap, regcache, regnum, gregs);
	}

	static void
	sparc64nbsd_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);
	}


	/* 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 sparc64nbsd_sigtramp_start = 0xffffffffffffdee4ULL;
	static const CORE_ADDR sparc64nbsd_sigtramp_end = 0xffffffffffffe000ULL;

	static int
	sparc64nbsd_pc_in_sigtramp (CORE_ADDR pc, const char *name)
	{
	if (pc >= sparc64nbsd_sigtramp_start && pc < sparc64nbsd_sigtramp_end)
	return 1;

	return nbsd_pc_in_sigtramp (pc, name);
	}

	trad_frame_saved_reg *
	sparc64nbsd_sigcontext_saved_regs (CORE_ADDR sigcontext_addr,
	const frame_info_ptr &this_frame)
	{
	struct gdbarch *gdbarch = get_frame_arch (this_frame);
	trad_frame_saved_reg *saved_regs;
	CORE_ADDR addr, sp;
	int regnum, delta;

	saved_regs = trad_frame_alloc_saved_regs (this_frame);

	/* 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. */

	saved_regs[SPARC_SP_REGNUM].set_addr (sigcontext_addr + 8);
	saved_regs[SPARC64_PC_REGNUM].set_addr (sigcontext_addr + 16);
	saved_regs[SPARC64_NPC_REGNUM].set_addr (sigcontext_addr + 24);
	saved_regs[SPARC64_STATE_REGNUM].set_addr (sigcontext_addr + 32);
	saved_regs[SPARC_G1_REGNUM].set_addr (sigcontext_addr + 40);
	saved_regs[SPARC_O0_REGNUM].set_addr (sigcontext_addr + 48);

	/* 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++)
	saved_regs[regnum].set_realreg (regnum + delta);
	saved_regs[SPARC64_Y_REGNUM].set_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++)
	saved_regs[regnum].set_realreg (regnum + delta);
	saved_regs[SPARC_O7_REGNUM].set_realreg (SPARC_I7_REGNUM);

	/* The `local' and `in' registers have been saved in the register
	save area. */
	addr = 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)
	saved_regs[regnum].set_addr (addr);

	/* Handle StackGhost. */
	{
	ULONGEST wcookie = sparc_fetch_wcookie (gdbarch);

	if (wcookie != 0)
	{
	ULONGEST i7;

	addr = saved_regs[SPARC_I7_REGNUM].addr ();
	i7 = get_frame_memory_unsigned (this_frame, addr, 8);
	saved_regs[SPARC_I7_REGNUM].set_value (i7 ^ wcookie);
	}
	}

	/* TODO: Handle the floating-point registers. */

	return saved_regs;
	}

	static struct sparc_frame_cache *
	sparc64nbsd_sigcontext_frame_cache (const frame_info_ptr &this_frame,
	void **this_cache)
	{
	struct sparc_frame_cache *cache;
	CORE_ADDR addr;

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

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

	/* 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 = sparc64nbsd_sigtramp_start;

	/* Since we couldn't find the frame's function, the cache was
	initialized under the assumption that we're frameless. */
	sparc_record_save_insn (cache);
	addr = get_frame_register_unsigned (this_frame, SPARC_FP_REGNUM);
	if (addr & 1)
	addr += BIAS;
	cache->base = addr;
	}

	/* We find the appropriate instance of `struct sigcontext' at a
	fixed offset in the signal frame. */
	addr = cache->base + 128 + 8;
	cache->saved_regs = sparc64nbsd_sigcontext_saved_regs (addr, this_frame);

	return cache;
	}

	static void
	sparc64nbsd_sigcontext_frame_this_id (const frame_info_ptr &this_frame,
	void **this_cache,
	struct frame_id *this_id)
	{
	struct sparc_frame_cache *cache =
	sparc64nbsd_sigcontext_frame_cache (this_frame, this_cache);

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

	static struct value *
	sparc64nbsd_sigcontext_frame_prev_register (const frame_info_ptr &this_frame,
	void **this_cache, int regnum)
	{
	struct sparc_frame_cache *cache =
	sparc64nbsd_sigcontext_frame_cache (this_frame, this_cache);

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

	static int
	sparc64nbsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
	const frame_info_ptr &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 (sparc64nbsd_pc_in_sigtramp (pc, name))
	{
	if (name == NULL \|\| !startswith (name, "__sigtramp_sigcontext"))
	return 1;
	}

	return 0;
	}

	static const struct frame_unwind_legacy sparc64nbsd_sigcontext_frame_unwind (
	"sparc64 netbsd sigcontext",
	SIGTRAMP_FRAME,
	FRAME_UNWIND_ARCH,
	default_frame_unwind_stop_reason,
	sparc64nbsd_sigcontext_frame_this_id,
	sparc64nbsd_sigcontext_frame_prev_register,
	NULL,
	sparc64nbsd_sigtramp_frame_sniffer
	);


	static const struct regset sparc64nbsd_gregset =
	{
	NULL, sparc64nbsd_supply_gregset, NULL
	};

	static const struct regset sparc64nbsd_fpregset =
	{
	NULL, sparc64nbsd_supply_fpregset, NULL
	};

	static void
	sparc64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	{
	sparc_gdbarch_tdep *tdep = gdbarch_tdep<sparc_gdbarch_tdep> (gdbarch);

	nbsd_init_abi (info, gdbarch);

	tdep->gregset = &sparc64nbsd_gregset;
	tdep->sizeof_gregset = 160;

	tdep->fpregset = &sparc64nbsd_fpregset;
	tdep->sizeof_fpregset = 272;

	/* Make sure we can single-step "new" syscalls. */
	tdep->step_trap = sparcnbsd_step_trap;

	frame_unwind_append_unwinder (gdbarch, &sparc64nbsd_sigcontext_frame_unwind);

	sparc64_init_abi (info, gdbarch);

	/* NetBSD/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);
	}

	void _initialize_sparc64nbsd_tdep ();
	void
	_initialize_sparc64nbsd_tdep ()
	{
	gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
	GDB_OSABI_NETBSD, sparc64nbsd_init_abi);
	}