[thirdparty/binutils-gdb.git] / gdb / aarch64-fbsd-tdep.c

/* Target-dependent code for FreeBSD/aarch64.

   Copyright (C) 2017-2024 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 "gdbarch.h"
#include "fbsd-tdep.h"
#include "aarch64-tdep.h"
#include "aarch64-fbsd-tdep.h"
#include "inferior.h"
#include "osabi.h"
#include "solib-svr4.h"
#include "target.h"
#include "tramp-frame.h"
#include "trad-frame.h"

/* Register maps.  */

static const struct regcache_map_entry aarch64_fbsd_gregmap[] =
  {
    { 30, AARCH64_X0_REGNUM, 8 }, /* x0 ... x29 */
    { 1, AARCH64_LR_REGNUM, 8 },
    { 1, AARCH64_SP_REGNUM, 8 },
    { 1, AARCH64_PC_REGNUM, 8 },
    { 1, AARCH64_CPSR_REGNUM, 4 },
    { 0 }
  };

static const struct regcache_map_entry aarch64_fbsd_fpregmap[] =
  {
    { 32, AARCH64_V0_REGNUM, 16 }, /* v0 ... v31 */
    { 1, AARCH64_FPSR_REGNUM, 4 },
    { 1, AARCH64_FPCR_REGNUM, 4 },
    { 0 }
  };

/* Register numbers are relative to tdep->tls_regnum_base.  */

static const struct regcache_map_entry aarch64_fbsd_tls_regmap[] =
  {
    { 1, 0, 8 },	/* tpidr */
    { 0 }
  };

/* In a signal frame, sp points to a 'struct sigframe' which is
   defined as:

   struct sigframe {
	   siginfo_t	sf_si;
	   ucontext_t	sf_uc;
   };

   ucontext_t is defined as:

   struct __ucontext {
	   sigset_t	uc_sigmask;
	   mcontext_t	uc_mcontext;
	   ...
   };

   The mcontext_t contains the general purpose register set followed
   by the floating point register set.  The floating point register
   set is only valid if the _MC_FP_VALID flag is set in mc_flags.  */

#define AARCH64_SIGFRAME_UCONTEXT_OFFSET	80
#define AARCH64_UCONTEXT_MCONTEXT_OFFSET	16
#define	AARCH64_MCONTEXT_FPREGS_OFFSET		272
#define	AARCH64_MCONTEXT_FLAGS_OFFSET		800
#define AARCH64_MCONTEXT_FLAG_FP_VALID		0x1

/* Implement the "init" method of struct tramp_frame.  */

static void
aarch64_fbsd_sigframe_init (const struct tramp_frame *self,
			     frame_info_ptr this_frame,
			     struct trad_frame_cache *this_cache,
			     CORE_ADDR func)
{
  struct gdbarch *gdbarch = get_frame_arch (this_frame);
  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  CORE_ADDR sp = get_frame_register_unsigned (this_frame, AARCH64_SP_REGNUM);
  CORE_ADDR mcontext_addr
    = (sp
       + AARCH64_SIGFRAME_UCONTEXT_OFFSET
       + AARCH64_UCONTEXT_MCONTEXT_OFFSET);
  gdb_byte buf[4];

  trad_frame_set_reg_regmap (this_cache, aarch64_fbsd_gregmap, mcontext_addr,
			     regcache_map_entry_size (aarch64_fbsd_gregmap));

  if (target_read_memory (mcontext_addr + AARCH64_MCONTEXT_FLAGS_OFFSET, buf,
			  4) == 0
      && (extract_unsigned_integer (buf, 4, byte_order)
	  & AARCH64_MCONTEXT_FLAG_FP_VALID))
    trad_frame_set_reg_regmap (this_cache, aarch64_fbsd_fpregmap,
			       mcontext_addr + AARCH64_MCONTEXT_FPREGS_OFFSET,
			       regcache_map_entry_size (aarch64_fbsd_fpregmap));

  trad_frame_set_id (this_cache, frame_id_build (sp, func));
}

static const struct tramp_frame aarch64_fbsd_sigframe =
{
  SIGTRAMP_FRAME,
  4,
  {
    {0x910003e0, ULONGEST_MAX},		/* mov  x0, sp  */
    {0x91014000, ULONGEST_MAX},		/* add  x0, x0, #SF_UC  */
    {0xd2803428, ULONGEST_MAX},		/* mov  x8, #SYS_sigreturn  */
    {0xd4000001, ULONGEST_MAX},		/* svc  0x0  */
    {TRAMP_SENTINEL_INSN, ULONGEST_MAX}
  },
  aarch64_fbsd_sigframe_init
};

/* Register set definitions.  */

const struct regset aarch64_fbsd_gregset =
  {
    aarch64_fbsd_gregmap,
    regcache_supply_regset, regcache_collect_regset
  };

const struct regset aarch64_fbsd_fpregset =
  {
    aarch64_fbsd_fpregmap,
    regcache_supply_regset, regcache_collect_regset
  };

static void
aarch64_fbsd_supply_tls_regset (const struct regset *regset,
				struct regcache *regcache,
				int regnum, const void *buf, size_t size)
{
  struct gdbarch *gdbarch = regcache->arch ();
  aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);

  regcache->supply_regset (regset, tdep->tls_regnum_base, regnum, buf, size);
}

static void
aarch64_fbsd_collect_tls_regset (const struct regset *regset,
				 const struct regcache *regcache,
				 int regnum, void *buf, size_t size)
{
  struct gdbarch *gdbarch = regcache->arch ();
  aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);

  regcache->collect_regset (regset, tdep->tls_regnum_base, regnum, buf, size);
}

const struct regset aarch64_fbsd_tls_regset =
  {
    aarch64_fbsd_tls_regmap,
    aarch64_fbsd_supply_tls_regset, aarch64_fbsd_collect_tls_regset
  };

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

static void
aarch64_fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
					   iterate_over_regset_sections_cb *cb,
					   void *cb_data,
					   const struct regcache *regcache)
{
  aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);

  cb (".reg", AARCH64_FBSD_SIZEOF_GREGSET, AARCH64_FBSD_SIZEOF_GREGSET,
      &aarch64_fbsd_gregset, NULL, cb_data);
  cb (".reg2", AARCH64_FBSD_SIZEOF_FPREGSET, AARCH64_FBSD_SIZEOF_FPREGSET,
      &aarch64_fbsd_fpregset, NULL, cb_data);

  if (tdep->has_tls ())
    cb (".reg-aarch-tls", AARCH64_FBSD_SIZEOF_TLSREGSET,
	AARCH64_FBSD_SIZEOF_TLSREGSET, &aarch64_fbsd_tls_regset,
	"TLS register", cb_data);
}

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

static const struct target_desc *
aarch64_fbsd_core_read_description (struct gdbarch *gdbarch,
				    struct target_ops *target, bfd *abfd)
{
  asection *tls = bfd_get_section_by_name (abfd, ".reg-aarch-tls");

  aarch64_features features;
  features.tls = tls != nullptr? 1 : 0;

  return aarch64_read_description (features);
}

/* Implement the get_thread_local_address gdbarch method.  */

static CORE_ADDR
aarch64_fbsd_get_thread_local_address (struct gdbarch *gdbarch, ptid_t ptid,
				       CORE_ADDR lm_addr, CORE_ADDR offset)
{
  aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);
  struct regcache *regcache;

  regcache = get_thread_arch_regcache (current_inferior (), ptid, gdbarch);

  target_fetch_registers (regcache, tdep->tls_regnum_base);

  ULONGEST tpidr;
  if (regcache->cooked_read (tdep->tls_regnum_base, &tpidr) != REG_VALID)
    error (_("Unable to fetch %%tpidr"));

  /* %tpidr points to the TCB whose first member is the dtv
      pointer.  */
  CORE_ADDR dtv_addr = tpidr;
  return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset);
}

/* Implement the 'init_osabi' method of struct gdb_osabi_handler.  */

static void
aarch64_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
  aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);

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

  set_solib_svr4_fetch_link_map_offsets (gdbarch,
					 svr4_lp64_fetch_link_map_offsets);

  tramp_frame_prepend_unwinder (gdbarch, &aarch64_fbsd_sigframe);

  /* Enable longjmp.  */
  tdep->jb_pc = 13;

  set_gdbarch_iterate_over_regset_sections
    (gdbarch, aarch64_fbsd_iterate_over_regset_sections);
  set_gdbarch_core_read_description (gdbarch,
				     aarch64_fbsd_core_read_description);

  if (tdep->has_tls ())
    {
      set_gdbarch_fetch_tls_load_module_address (gdbarch,
						 svr4_fetch_objfile_link_map);
      set_gdbarch_get_thread_local_address
	(gdbarch, aarch64_fbsd_get_thread_local_address);
    }
}

void _initialize_aarch64_fbsd_tdep ();
void
_initialize_aarch64_fbsd_tdep ()
{
  gdbarch_register_osabi (bfd_arch_aarch64, 0, GDB_OSABI_FREEBSD,
			  aarch64_fbsd_init_abi);
}
Commit	Line	Data
c0f84956 JB	1	/* Target-dependent code for FreeBSD/aarch64.
c0f84956 JB	2
1d506c26	3	Copyright (C) 2017-2024 Free Software Foundation, Inc.
c0f84956 JB	4
	5	This file is part of GDB.
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 3 of the License, or
	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program. If not, see <http://www.gnu.org/licenses/>. */
	19
	20	#include "defs.h"
	21
d55e5aa6	22	#include "gdbarch.h"
4de283e4 TT	23	#include "fbsd-tdep.h"
	24	#include "aarch64-tdep.h"
	25	#include "aarch64-fbsd-tdep.h"
f9fbb763	26	#include "inferior.h"
c0f84956 JB	27	#include "osabi.h"
	28	#include "solib-svr4.h"
	29	#include "target.h"
d55e5aa6	30	#include "tramp-frame.h"
4de283e4	31	#include "trad-frame.h"
c0f84956	32
7054e2ff JB	33	/* Register maps. */
	34
	35	static const struct regcache_map_entry aarch64_fbsd_gregmap[] =
	36	{
	37	{ 30, AARCH64_X0_REGNUM, 8 }, /* x0 ... x29 */
	38	{ 1, AARCH64_LR_REGNUM, 8 },
	39	{ 1, AARCH64_SP_REGNUM, 8 },
	40	{ 1, AARCH64_PC_REGNUM, 8 },
	41	{ 1, AARCH64_CPSR_REGNUM, 4 },
	42	{ 0 }
	43	};
	44
	45	static const struct regcache_map_entry aarch64_fbsd_fpregmap[] =
	46	{
	47	{ 32, AARCH64_V0_REGNUM, 16 }, /* v0 ... v31 */
	48	{ 1, AARCH64_FPSR_REGNUM, 4 },
	49	{ 1, AARCH64_FPCR_REGNUM, 4 },
	50	{ 0 }
	51	};
	52
ba60b963	53	/* Register numbers are relative to tdep->tls_regnum_base. */
d818c7ad JB	54
	55	static const struct regcache_map_entry aarch64_fbsd_tls_regmap[] =
	56	{
	57	{ 1, 0, 8 }, /* tpidr */
	58	{ 0 }
	59	};
	60
c0f84956 JB	61	/* In a signal frame, sp points to a 'struct sigframe' which is
	62	defined as:
	63
	64	struct sigframe {
	65	siginfo_t sf_si;
	66	ucontext_t sf_uc;
	67	};
	68
	69	ucontext_t is defined as:
	70
	71	struct __ucontext {
	72	sigset_t uc_sigmask;
	73	mcontext_t uc_mcontext;
	74	...
	75	};
	76
	77	The mcontext_t contains the general purpose register set followed
	78	by the floating point register set. The floating point register
	79	set is only valid if the _MC_FP_VALID flag is set in mc_flags. */
	80
c0f84956 JB	81	#define AARCH64_SIGFRAME_UCONTEXT_OFFSET 80
	82	#define AARCH64_UCONTEXT_MCONTEXT_OFFSET 16
	83	#define AARCH64_MCONTEXT_FPREGS_OFFSET 272
	84	#define AARCH64_MCONTEXT_FLAGS_OFFSET 800
	85	#define AARCH64_MCONTEXT_FLAG_FP_VALID 0x1
	86
	87	/* Implement the "init" method of struct tramp_frame. */
	88
	89	static void
	90	aarch64_fbsd_sigframe_init (const struct tramp_frame *self,
bd2b40ac	91	frame_info_ptr this_frame,
c0f84956 JB	92	struct trad_frame_cache *this_cache,
	93	CORE_ADDR func)
	94	{
	95	struct gdbarch *gdbarch = get_frame_arch (this_frame);
	96	enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
	97	CORE_ADDR sp = get_frame_register_unsigned (this_frame, AARCH64_SP_REGNUM);
7054e2ff JB	98	CORE_ADDR mcontext_addr
	99	= (sp
	100	+ AARCH64_SIGFRAME_UCONTEXT_OFFSET
	101	+ AARCH64_UCONTEXT_MCONTEXT_OFFSET);
c0f84956	102	gdb_byte buf[4];
7054e2ff JB	103
	104	trad_frame_set_reg_regmap (this_cache, aarch64_fbsd_gregmap, mcontext_addr,
	105	regcache_map_entry_size (aarch64_fbsd_gregmap));
c0f84956 JB	106
	107	if (target_read_memory (mcontext_addr + AARCH64_MCONTEXT_FLAGS_OFFSET, buf,
	108	4) == 0
	109	&& (extract_unsigned_integer (buf, 4, byte_order)
	110	& AARCH64_MCONTEXT_FLAG_FP_VALID))
7054e2ff JB	111	trad_frame_set_reg_regmap (this_cache, aarch64_fbsd_fpregmap,
	112	mcontext_addr + AARCH64_MCONTEXT_FPREGS_OFFSET,
	113	regcache_map_entry_size (aarch64_fbsd_fpregmap));
c0f84956 JB	114
	115	trad_frame_set_id (this_cache, frame_id_build (sp, func));
	116	}
	117
	118	static const struct tramp_frame aarch64_fbsd_sigframe =
	119	{
	120	SIGTRAMP_FRAME,
	121	4,
	122	{
7bc02706 TT	123	{0x910003e0, ULONGEST_MAX}, /* mov x0, sp */
	124	{0x91014000, ULONGEST_MAX}, /* add x0, x0, #SF_UC */
	125	{0xd2803428, ULONGEST_MAX}, /* mov x8, #SYS_sigreturn */
	126	{0xd4000001, ULONGEST_MAX}, /* svc 0x0 */
	127	{TRAMP_SENTINEL_INSN, ULONGEST_MAX}
c0f84956 JB	128	},
	129	aarch64_fbsd_sigframe_init
	130	};
	131
c0f84956 JB	132	/* Register set definitions. */
	133
	134	const struct regset aarch64_fbsd_gregset =
	135	{
	136	aarch64_fbsd_gregmap,
	137	regcache_supply_regset, regcache_collect_regset
	138	};
	139
	140	const struct regset aarch64_fbsd_fpregset =
	141	{
	142	aarch64_fbsd_fpregmap,
	143	regcache_supply_regset, regcache_collect_regset
	144	};
	145
d818c7ad JB	146	static void
	147	aarch64_fbsd_supply_tls_regset (const struct regset *regset,
	148	struct regcache *regcache,
	149	int regnum, const void *buf, size_t size)
	150	{
	151	struct gdbarch *gdbarch = regcache->arch ();
	152	aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);
	153
ba60b963	154	regcache->supply_regset (regset, tdep->tls_regnum_base, regnum, buf, size);
d818c7ad JB	155	}
	156
	157	static void
	158	aarch64_fbsd_collect_tls_regset (const struct regset *regset,
	159	const struct regcache *regcache,
	160	int regnum, void *buf, size_t size)
	161	{
	162	struct gdbarch *gdbarch = regcache->arch ();
	163	aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);
	164
ba60b963	165	regcache->collect_regset (regset, tdep->tls_regnum_base, regnum, buf, size);
d818c7ad JB	166	}
	167
	168	const struct regset aarch64_fbsd_tls_regset =
	169	{
	170	aarch64_fbsd_tls_regmap,
	171	aarch64_fbsd_supply_tls_regset, aarch64_fbsd_collect_tls_regset
	172	};
	173
89203d40	174	/* Implement the "iterate_over_regset_sections" gdbarch method. */
c0f84956 JB	175
	176	static void
	177	aarch64_fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
	178	iterate_over_regset_sections_cb *cb,
	179	void *cb_data,
	180	const struct regcache *regcache)
	181	{
08106042	182	aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);
0a765c1a	183
a616bb94 AH	184	cb (".reg", AARCH64_FBSD_SIZEOF_GREGSET, AARCH64_FBSD_SIZEOF_GREGSET,
	185	&aarch64_fbsd_gregset, NULL, cb_data);
	186	cb (".reg2", AARCH64_FBSD_SIZEOF_FPREGSET, AARCH64_FBSD_SIZEOF_FPREGSET,
	187	&aarch64_fbsd_fpregset, NULL, cb_data);
0a765c1a JB	188
0a765c1a JB	189	if (tdep->has_tls ())
d818c7ad JB	190	cb (".reg-aarch-tls", AARCH64_FBSD_SIZEOF_TLSREGSET,
	191	AARCH64_FBSD_SIZEOF_TLSREGSET, &aarch64_fbsd_tls_regset,
	192	"TLS register", cb_data);
0a765c1a JB	193	}
	194
	195	/* Implement the "core_read_description" gdbarch method. */
	196
	197	static const struct target_desc *
	198	aarch64_fbsd_core_read_description (struct gdbarch *gdbarch,
	199	struct target_ops target, bfd abfd)
	200	{
	201	asection *tls = bfd_get_section_by_name (abfd, ".reg-aarch-tls");
	202
0ee6b1c5	203	aarch64_features features;
ba60b963	204	features.tls = tls != nullptr? 1 : 0;
0ee6b1c5 JB	205
0ee6b1c5 JB	206	return aarch64_read_description (features);
c0f84956 JB	207	}
c0f84956 JB	208
f9fbb763 JB	209	/* Implement the get_thread_local_address gdbarch method. */
	210
	211	static CORE_ADDR
	212	aarch64_fbsd_get_thread_local_address (struct gdbarch *gdbarch, ptid_t ptid,
	213	CORE_ADDR lm_addr, CORE_ADDR offset)
	214	{
08106042	215	aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);
f9fbb763 JB	216	struct regcache *regcache;
f9fbb763 JB	217
74387712	218	regcache = get_thread_arch_regcache (current_inferior (), ptid, gdbarch);
f9fbb763	219
ba60b963	220	target_fetch_registers (regcache, tdep->tls_regnum_base);
f9fbb763 JB	221
f9fbb763 JB	222	ULONGEST tpidr;
ba60b963	223	if (regcache->cooked_read (tdep->tls_regnum_base, &tpidr) != REG_VALID)
f9fbb763 JB	224	error (_("Unable to fetch %%tpidr"));
	225
	226	/* %tpidr points to the TCB whose first member is the dtv
	227	pointer. */
	228	CORE_ADDR dtv_addr = tpidr;
	229	return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset);
	230	}
	231
c0f84956 JB	232	/* Implement the 'init_osabi' method of struct gdb_osabi_handler. */
	233
	234	static void
	235	aarch64_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
	236	{
08106042	237	aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);
c0f84956 JB	238
	239	/* Generic FreeBSD support. */
	240	fbsd_init_abi (info, gdbarch);
	241
	242	set_solib_svr4_fetch_link_map_offsets (gdbarch,
	243	svr4_lp64_fetch_link_map_offsets);
	244
	245	tramp_frame_prepend_unwinder (gdbarch, &aarch64_fbsd_sigframe);
	246
	247	/* Enable longjmp. */
	248	tdep->jb_pc = 13;
	249
	250	set_gdbarch_iterate_over_regset_sections
	251	(gdbarch, aarch64_fbsd_iterate_over_regset_sections);
0a765c1a JB	252	set_gdbarch_core_read_description (gdbarch,
0a765c1a JB	253	aarch64_fbsd_core_read_description);
f9fbb763 JB	254
	255	if (tdep->has_tls ())
	256	{
	257	set_gdbarch_fetch_tls_load_module_address (gdbarch,
	258	svr4_fetch_objfile_link_map);
	259	set_gdbarch_get_thread_local_address
	260	(gdbarch, aarch64_fbsd_get_thread_local_address);
	261	}
c0f84956 JB	262	}
c0f84956 JB	263
6c265988	264	void _initialize_aarch64_fbsd_tdep ();
c0f84956	265	void
6c265988	266	_initialize_aarch64_fbsd_tdep ()
c0f84956 JB	267	{
	268	gdbarch_register_osabi (bfd_arch_aarch64, 0, GDB_OSABI_FREEBSD,
	269	aarch64_fbsd_init_abi);
	270	}