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/* Target-dependent code for FreeBSD/aarch64.
Copyright (C) 2017-2020 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"
/* 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 }
};
/* 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,
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];
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
};
/* 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)
{
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);
}
/* 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
_initialize_aarch64_fbsd_tdep ()
{
gdbarch_register_osabi (bfd_arch_aarch64, 0, GDB_OSABI_FREEBSD,
aarch64_fbsd_init_abi);
}
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