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https://sourceware.org/git/binutils-gdb.git
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ec45252592
Move the declarations out of defs.h, and the implementations out of findvar.c. I opted for a new file, because this functionality of converting integers to bytes and vice-versa seems a bit to generic to live in findvar.c. Change-Id: I524858fca33901ee2150c582bac16042148d2251 Approved-By: John Baldwin <jhb@FreeBSD.org>
271 lines
8.0 KiB
C
271 lines
8.0 KiB
C
/* Target-dependent code for FreeBSD/aarch64.
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Copyright (C) 2017-2024 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "extract-store-integer.h"
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#include "gdbarch.h"
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#include "fbsd-tdep.h"
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#include "aarch64-tdep.h"
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#include "aarch64-fbsd-tdep.h"
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#include "inferior.h"
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#include "osabi.h"
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#include "solib-svr4.h"
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#include "target.h"
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#include "tramp-frame.h"
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#include "trad-frame.h"
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/* Register maps. */
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static const struct regcache_map_entry aarch64_fbsd_gregmap[] =
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{
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{ 30, AARCH64_X0_REGNUM, 8 }, /* x0 ... x29 */
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{ 1, AARCH64_LR_REGNUM, 8 },
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{ 1, AARCH64_SP_REGNUM, 8 },
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{ 1, AARCH64_PC_REGNUM, 8 },
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{ 1, AARCH64_CPSR_REGNUM, 4 },
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{ 0 }
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};
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static const struct regcache_map_entry aarch64_fbsd_fpregmap[] =
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{
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{ 32, AARCH64_V0_REGNUM, 16 }, /* v0 ... v31 */
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{ 1, AARCH64_FPSR_REGNUM, 4 },
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{ 1, AARCH64_FPCR_REGNUM, 4 },
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{ 0 }
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};
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/* Register numbers are relative to tdep->tls_regnum_base. */
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static const struct regcache_map_entry aarch64_fbsd_tls_regmap[] =
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{
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{ 1, 0, 8 }, /* tpidr */
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{ 0 }
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};
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/* In a signal frame, sp points to a 'struct sigframe' which is
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defined as:
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struct sigframe {
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siginfo_t sf_si;
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ucontext_t sf_uc;
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};
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ucontext_t is defined as:
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struct __ucontext {
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sigset_t uc_sigmask;
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mcontext_t uc_mcontext;
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...
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};
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The mcontext_t contains the general purpose register set followed
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by the floating point register set. The floating point register
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set is only valid if the _MC_FP_VALID flag is set in mc_flags. */
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#define AARCH64_SIGFRAME_UCONTEXT_OFFSET 80
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#define AARCH64_UCONTEXT_MCONTEXT_OFFSET 16
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#define AARCH64_MCONTEXT_FPREGS_OFFSET 272
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#define AARCH64_MCONTEXT_FLAGS_OFFSET 800
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#define AARCH64_MCONTEXT_FLAG_FP_VALID 0x1
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/* Implement the "init" method of struct tramp_frame. */
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static void
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aarch64_fbsd_sigframe_init (const struct tramp_frame *self,
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const frame_info_ptr &this_frame,
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struct trad_frame_cache *this_cache,
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CORE_ADDR func)
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{
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struct gdbarch *gdbarch = get_frame_arch (this_frame);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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CORE_ADDR sp = get_frame_register_unsigned (this_frame, AARCH64_SP_REGNUM);
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CORE_ADDR mcontext_addr
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= (sp
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+ AARCH64_SIGFRAME_UCONTEXT_OFFSET
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+ AARCH64_UCONTEXT_MCONTEXT_OFFSET);
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gdb_byte buf[4];
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trad_frame_set_reg_regmap (this_cache, aarch64_fbsd_gregmap, mcontext_addr,
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regcache_map_entry_size (aarch64_fbsd_gregmap));
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if (target_read_memory (mcontext_addr + AARCH64_MCONTEXT_FLAGS_OFFSET, buf,
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4) == 0
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&& (extract_unsigned_integer (buf, 4, byte_order)
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& AARCH64_MCONTEXT_FLAG_FP_VALID))
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trad_frame_set_reg_regmap (this_cache, aarch64_fbsd_fpregmap,
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mcontext_addr + AARCH64_MCONTEXT_FPREGS_OFFSET,
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regcache_map_entry_size (aarch64_fbsd_fpregmap));
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trad_frame_set_id (this_cache, frame_id_build (sp, func));
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}
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static const struct tramp_frame aarch64_fbsd_sigframe =
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{
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SIGTRAMP_FRAME,
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4,
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{
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{0x910003e0, ULONGEST_MAX}, /* mov x0, sp */
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{0x91014000, ULONGEST_MAX}, /* add x0, x0, #SF_UC */
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{0xd2803428, ULONGEST_MAX}, /* mov x8, #SYS_sigreturn */
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{0xd4000001, ULONGEST_MAX}, /* svc 0x0 */
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{TRAMP_SENTINEL_INSN, ULONGEST_MAX}
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},
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aarch64_fbsd_sigframe_init
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};
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/* Register set definitions. */
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const struct regset aarch64_fbsd_gregset =
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{
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aarch64_fbsd_gregmap,
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regcache_supply_regset, regcache_collect_regset
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};
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const struct regset aarch64_fbsd_fpregset =
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{
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aarch64_fbsd_fpregmap,
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regcache_supply_regset, regcache_collect_regset
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};
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static void
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aarch64_fbsd_supply_tls_regset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *buf, size_t size)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);
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regcache->supply_regset (regset, tdep->tls_regnum_base, regnum, buf, size);
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}
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static void
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aarch64_fbsd_collect_tls_regset (const struct regset *regset,
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const struct regcache *regcache,
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int regnum, void *buf, size_t size)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);
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regcache->collect_regset (regset, tdep->tls_regnum_base, regnum, buf, size);
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}
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const struct regset aarch64_fbsd_tls_regset =
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{
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aarch64_fbsd_tls_regmap,
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aarch64_fbsd_supply_tls_regset, aarch64_fbsd_collect_tls_regset
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};
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/* Implement the "iterate_over_regset_sections" gdbarch method. */
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static void
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aarch64_fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
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iterate_over_regset_sections_cb *cb,
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void *cb_data,
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const struct regcache *regcache)
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{
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aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);
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cb (".reg", AARCH64_FBSD_SIZEOF_GREGSET, AARCH64_FBSD_SIZEOF_GREGSET,
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&aarch64_fbsd_gregset, NULL, cb_data);
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cb (".reg2", AARCH64_FBSD_SIZEOF_FPREGSET, AARCH64_FBSD_SIZEOF_FPREGSET,
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&aarch64_fbsd_fpregset, NULL, cb_data);
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if (tdep->has_tls ())
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cb (".reg-aarch-tls", AARCH64_FBSD_SIZEOF_TLSREGSET,
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AARCH64_FBSD_SIZEOF_TLSREGSET, &aarch64_fbsd_tls_regset,
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"TLS register", cb_data);
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}
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/* Implement the "core_read_description" gdbarch method. */
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static const struct target_desc *
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aarch64_fbsd_core_read_description (struct gdbarch *gdbarch,
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struct target_ops *target, bfd *abfd)
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{
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asection *tls = bfd_get_section_by_name (abfd, ".reg-aarch-tls");
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aarch64_features features;
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features.tls = tls != nullptr? 1 : 0;
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return aarch64_read_description (features);
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}
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/* Implement the get_thread_local_address gdbarch method. */
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static CORE_ADDR
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aarch64_fbsd_get_thread_local_address (struct gdbarch *gdbarch, ptid_t ptid,
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CORE_ADDR lm_addr, CORE_ADDR offset)
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{
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aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);
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struct regcache *regcache;
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regcache = get_thread_arch_regcache (current_inferior (), ptid, gdbarch);
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target_fetch_registers (regcache, tdep->tls_regnum_base);
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ULONGEST tpidr;
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if (regcache->cooked_read (tdep->tls_regnum_base, &tpidr) != REG_VALID)
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error (_("Unable to fetch %%tpidr"));
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/* %tpidr points to the TCB whose first member is the dtv
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pointer. */
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CORE_ADDR dtv_addr = tpidr;
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return fbsd_get_thread_local_address (gdbarch, dtv_addr, lm_addr, offset);
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}
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/* Implement the 'init_osabi' method of struct gdb_osabi_handler. */
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static void
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aarch64_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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aarch64_gdbarch_tdep *tdep = gdbarch_tdep<aarch64_gdbarch_tdep> (gdbarch);
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/* Generic FreeBSD support. */
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fbsd_init_abi (info, gdbarch);
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set_solib_svr4_fetch_link_map_offsets (gdbarch,
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svr4_lp64_fetch_link_map_offsets);
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tramp_frame_prepend_unwinder (gdbarch, &aarch64_fbsd_sigframe);
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/* Enable longjmp. */
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tdep->jb_pc = 13;
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set_gdbarch_iterate_over_regset_sections
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(gdbarch, aarch64_fbsd_iterate_over_regset_sections);
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set_gdbarch_core_read_description (gdbarch,
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aarch64_fbsd_core_read_description);
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if (tdep->has_tls ())
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{
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set_gdbarch_fetch_tls_load_module_address (gdbarch,
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svr4_fetch_objfile_link_map);
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set_gdbarch_get_thread_local_address
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(gdbarch, aarch64_fbsd_get_thread_local_address);
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}
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}
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void _initialize_aarch64_fbsd_tdep ();
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void
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_initialize_aarch64_fbsd_tdep ()
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{
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gdbarch_register_osabi (bfd_arch_aarch64, 0, GDB_OSABI_FREEBSD,
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aarch64_fbsd_init_abi);
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}
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