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- /* Target-dependent code for FreeBSD/aarch64.
- Copyright (C) 2017-2022 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)
- {
- aarch64_gdbarch_tdep *tdep = (aarch64_gdbarch_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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