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

/* Target-dependent code for FreeBSD/aarch64.

   Copyright (C) 2017 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 "osabi.h"
#include "solib-svr4.h"
#include "target.h"
#include "tramp-frame.h"
#include "trad-frame.h"

/* 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_MCONTEXT_REG_SIZE               8
#define AARCH64_MCONTEXT_FPREG_SIZE             16
#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,
			     struct frame_info *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];
  int i;

  for (i = 0; i < 30; i++)
    {
      trad_frame_set_reg_addr (this_cache,
			       AARCH64_X0_REGNUM + i,
			       mcontext_addr + i * AARCH64_MCONTEXT_REG_SIZE);
    }
  trad_frame_set_reg_addr (this_cache, AARCH64_LR_REGNUM,
			   mcontext_addr + 30 * AARCH64_MCONTEXT_REG_SIZE);
  trad_frame_set_reg_addr (this_cache, AARCH64_SP_REGNUM,
			   mcontext_addr + 31 * AARCH64_MCONTEXT_REG_SIZE);
  trad_frame_set_reg_addr (this_cache, AARCH64_PC_REGNUM,
			   mcontext_addr + 32 * AARCH64_MCONTEXT_REG_SIZE);
  trad_frame_set_reg_addr (this_cache, AARCH64_CPSR_REGNUM,
			   mcontext_addr + 33 * AARCH64_MCONTEXT_REG_SIZE);

  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))
    {
      for (i = 0; i < 32; i++)
	{
	  trad_frame_set_reg_addr (this_cache, AARCH64_V0_REGNUM + i,
				   mcontext_addr
				   + AARCH64_MCONTEXT_FPREGS_OFFSET
				   + i * AARCH64_MCONTEXT_FPREG_SIZE);
	}
      trad_frame_set_reg_addr (this_cache, AARCH64_FPSR_REGNUM,
			       mcontext_addr + AARCH64_MCONTEXT_FPREGS_OFFSET
			       + 32 * AARCH64_MCONTEXT_FPREG_SIZE);
      trad_frame_set_reg_addr (this_cache, AARCH64_FPCR_REGNUM,
			       mcontext_addr + AARCH64_MCONTEXT_FPREGS_OFFSET
			       + 32 * AARCH64_MCONTEXT_FPREG_SIZE + 4);
    }

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

static const struct tramp_frame aarch64_fbsd_sigframe =
{
  SIGTRAMP_FRAME,
  4,
  {
    {0x910003e0, -1},		/* mov  x0, sp  */
    {0x91014000, -1},		/* add  x0, x0, #SF_UC  */
    {0xd2803428, -1},		/* mov  x8, #SYS_sigreturn  */
    {0xd4000001, -1},		/* svc  0x0  */
    {TRAMP_SENTINEL_INSN, -1}
  },
  aarch64_fbsd_sigframe_init
};

/* 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 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
  };

/* Implement the "regset_from_core_section" 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)
{
  cb (".reg", AARCH64_FBSD_SIZEOF_GREGSET, &aarch64_fbsd_gregset,
      NULL, cb_data);
  cb (".reg2", AARCH64_FBSD_SIZEOF_FPREGSET, &aarch64_fbsd_fpregset,
      NULL, cb_data);
}

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

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

void
_initialize_aarch64_fbsd_tdep (void)
{
  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.
	2
	3	Copyright (C) 2017 Free Software Foundation, Inc.
	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
	22	#include "gdbarch.h"
	23	#include "fbsd-tdep.h"
	24	#include "aarch64-tdep.h"
	25	#include "aarch64-fbsd-tdep.h"
	26	#include "osabi.h"
	27	#include "solib-svr4.h"
	28	#include "target.h"
	29	#include "tramp-frame.h"
	30	#include "trad-frame.h"
	31
	32	/* In a signal frame, sp points to a 'struct sigframe' which is
	33	defined as:
	34
	35	struct sigframe {
	36	siginfo_t sf_si;
	37	ucontext_t sf_uc;
	38	};
	39
	40	ucontext_t is defined as:
	41
	42	struct __ucontext {
	43	sigset_t uc_sigmask;
	44	mcontext_t uc_mcontext;
	45	...
	46	};
	47
	48	The mcontext_t contains the general purpose register set followed
	49	by the floating point register set. The floating point register
	50	set is only valid if the _MC_FP_VALID flag is set in mc_flags. */
	51
	52	#define AARCH64_MCONTEXT_REG_SIZE 8
	53	#define AARCH64_MCONTEXT_FPREG_SIZE 16
	54	#define AARCH64_SIGFRAME_UCONTEXT_OFFSET 80
	55	#define AARCH64_UCONTEXT_MCONTEXT_OFFSET 16
	56	#define AARCH64_MCONTEXT_FPREGS_OFFSET 272
	57	#define AARCH64_MCONTEXT_FLAGS_OFFSET 800
	58	#define AARCH64_MCONTEXT_FLAG_FP_VALID 0x1
	59
	60	/* Implement the "init" method of struct tramp_frame. */
	61
	62	static void
	63	aarch64_fbsd_sigframe_init (const struct tramp_frame *self,
	64	struct frame_info *this_frame,
65	struct trad_frame_cache *this_cache,
66	CORE_ADDR func)
67	{
68	struct gdbarch *gdbarch = get_frame_arch (this_frame);
69	enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
70	CORE_ADDR sp = get_frame_register_unsigned (this_frame, AARCH64_SP_REGNUM);
71	CORE_ADDR mcontext_addr =
72	sp
73	+ AARCH64_SIGFRAME_UCONTEXT_OFFSET
74	+ AARCH64_UCONTEXT_MCONTEXT_OFFSET;
75	gdb_byte buf[4];
76	int i;
77
78	for (i = 0; i < 30; i++)
79	{
80	trad_frame_set_reg_addr (this_cache,
81	AARCH64_X0_REGNUM + i,
82	mcontext_addr + i * AARCH64_MCONTEXT_REG_SIZE);
83	}
84	trad_frame_set_reg_addr (this_cache, AARCH64_LR_REGNUM,
85	mcontext_addr + 30 * AARCH64_MCONTEXT_REG_SIZE);
86	trad_frame_set_reg_addr (this_cache, AARCH64_SP_REGNUM,
87	mcontext_addr + 31 * AARCH64_MCONTEXT_REG_SIZE);
88	trad_frame_set_reg_addr (this_cache, AARCH64_PC_REGNUM,
89	mcontext_addr + 32 * AARCH64_MCONTEXT_REG_SIZE);
90	trad_frame_set_reg_addr (this_cache, AARCH64_CPSR_REGNUM,
91	mcontext_addr + 33 * AARCH64_MCONTEXT_REG_SIZE);
92
93	if (target_read_memory (mcontext_addr + AARCH64_MCONTEXT_FLAGS_OFFSET, buf,
94	4) == 0
95	&& (extract_unsigned_integer (buf, 4, byte_order)
96	& AARCH64_MCONTEXT_FLAG_FP_VALID))
97	{
98	for (i = 0; i < 32; i++)
99	{
100	trad_frame_set_reg_addr (this_cache, AARCH64_V0_REGNUM + i,
101	mcontext_addr
102	+ AARCH64_MCONTEXT_FPREGS_OFFSET
103	+ i * AARCH64_MCONTEXT_FPREG_SIZE);
104	}
105	trad_frame_set_reg_addr (this_cache, AARCH64_FPSR_REGNUM,
106	mcontext_addr + AARCH64_MCONTEXT_FPREGS_OFFSET
107	+ 32 * AARCH64_MCONTEXT_FPREG_SIZE);
108	trad_frame_set_reg_addr (this_cache, AARCH64_FPCR_REGNUM,
109	mcontext_addr + AARCH64_MCONTEXT_FPREGS_OFFSET
110	+ 32 * AARCH64_MCONTEXT_FPREG_SIZE + 4);
111	}
112
113	trad_frame_set_id (this_cache, frame_id_build (sp, func));
114	}
115
116	static const struct tramp_frame aarch64_fbsd_sigframe =
117	{
118	SIGTRAMP_FRAME,
119	4,
120	{
121	{0x910003e0, -1}, /* mov x0, sp */
122	{0x91014000, -1}, /* add x0, x0, #SF_UC */
123	{0xd2803428, -1}, /* mov x8, #SYS_sigreturn */
124	{0xd4000001, -1}, /* svc 0x0 */
125	{TRAMP_SENTINEL_INSN, -1}
126	},
127	aarch64_fbsd_sigframe_init
128	};
129
130	/* Register maps. */
131
132	static const struct regcache_map_entry aarch64_fbsd_gregmap[] =
133	{
134	{ 30, AARCH64_X0_REGNUM, 8 }, /* x0 ... x29 */
135	{ 1, AARCH64_LR_REGNUM, 8 },
136	{ 1, AARCH64_SP_REGNUM, 8 },
137	{ 1, AARCH64_PC_REGNUM, 8 },
138	{ 1, AARCH64_CPSR_REGNUM, 4 },
139	{ 0 }
140	};
141
142	static const struct regcache_map_entry aarch64_fbsd_fpregmap[] =
143	{
144	{ 32, AARCH64_V0_REGNUM, 16 }, /* v0 ... v31 */
145	{ 1, AARCH64_FPSR_REGNUM, 4 },
146	{ 1, AARCH64_FPCR_REGNUM, 4 },
147	{ 0 }
148	};
149
150	/* Register set definitions. */
151
152	const struct regset aarch64_fbsd_gregset =
153	{
154	aarch64_fbsd_gregmap,
155	regcache_supply_regset, regcache_collect_regset
156	};
157
158	const struct regset aarch64_fbsd_fpregset =
159	{
160	aarch64_fbsd_fpregmap,
161	regcache_supply_regset, regcache_collect_regset
162	};
163
164	/* Implement the "regset_from_core_section" gdbarch method. */
165
166	static void
167	aarch64_fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
168	iterate_over_regset_sections_cb *cb,
169	void *cb_data,
170	const struct regcache *regcache)
171	{
172	cb (".reg", AARCH64_FBSD_SIZEOF_GREGSET, &aarch64_fbsd_gregset,
173	NULL, cb_data);
174	cb (".reg2", AARCH64_FBSD_SIZEOF_FPREGSET, &aarch64_fbsd_fpregset,
175	NULL, cb_data);
176	}
177
178	/* Implement the 'init_osabi' method of struct gdb_osabi_handler. */
179
180	static void
181	aarch64_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
182	{
183	struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
184
185	/* Generic FreeBSD support. */
186	fbsd_init_abi (info, gdbarch);
187
188	set_solib_svr4_fetch_link_map_offsets (gdbarch,
189	svr4_lp64_fetch_link_map_offsets);
190
191	tramp_frame_prepend_unwinder (gdbarch, &aarch64_fbsd_sigframe);
192
193	/* Enable longjmp. */
194	tdep->jb_pc = 13;
195
196	set_gdbarch_iterate_over_regset_sections
197	(gdbarch, aarch64_fbsd_iterate_over_regset_sections);
198	}
199
200	void
201	_initialize_aarch64_fbsd_tdep (void)
202	{
203	gdbarch_register_osabi (bfd_arch_aarch64, 0, GDB_OSABI_FREEBSD,
204	aarch64_fbsd_init_abi);
205	}