244 lines
6.6 KiB
C
244 lines
6.6 KiB
C
/* Target-dependent code for FreeBSD/arm.
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Copyright (C) 2017-2020 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 "defs.h"
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#include "elf/common.h"
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#include "target-descriptions.h"
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#include "aarch32-tdep.h"
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#include "arm-tdep.h"
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#include "arm-fbsd-tdep.h"
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#include "auxv.h"
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#include "fbsd-tdep.h"
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#include "gdbcore.h"
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#include "osabi.h"
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#include "solib-svr4.h"
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#include "trad-frame.h"
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#include "tramp-frame.h"
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/* Register maps. */
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static const struct regcache_map_entry arm_fbsd_gregmap[] =
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{
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{ 13, ARM_A1_REGNUM, 4 }, /* r0 ... r12 */
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{ 1, ARM_SP_REGNUM, 4 },
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{ 1, ARM_LR_REGNUM, 4 },
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{ 1, ARM_PC_REGNUM, 4 },
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{ 1, ARM_PS_REGNUM, 4 },
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{ 0 }
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};
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static const struct regcache_map_entry arm_fbsd_vfpregmap[] =
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{
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{ 32, ARM_D0_REGNUM, 8 }, /* d0 ... d31 */
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{ 1, ARM_FPSCR_REGNUM, 4 },
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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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mcontext_vfp_t sf_vfp;
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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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mcontext_t is defined as:
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struct {
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unsigned int __gregs[17];
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size_t mc_vfp_size;
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void *mc_vfp_ptr;
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...
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};
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mcontext_vfp_t is defined as:
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struct {
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uint64_t mcv_reg[32];
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uint32_t mcv_fpscr;
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};
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If the VFP state is valid, then mc_vfp_ptr will point to sf_vfp in
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the sigframe, otherwise it is NULL. There is no non-VFP floating
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point register state saved in the signal frame. */
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#define ARM_SIGFRAME_UCONTEXT_OFFSET 64
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#define ARM_UCONTEXT_MCONTEXT_OFFSET 16
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#define ARM_MCONTEXT_VFP_PTR_OFFSET 72
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/* Implement the "init" method of struct tramp_frame. */
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static void
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arm_fbsd_sigframe_init (const struct tramp_frame *self,
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struct frame_info *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, ARM_SP_REGNUM);
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CORE_ADDR mcontext_addr = (sp
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+ ARM_SIGFRAME_UCONTEXT_OFFSET
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+ ARM_UCONTEXT_MCONTEXT_OFFSET);
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ULONGEST mcontext_vfp_addr;
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trad_frame_set_reg_regmap (this_cache, arm_fbsd_gregmap, mcontext_addr,
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regcache_map_entry_size (arm_fbsd_gregmap));
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if (safe_read_memory_unsigned_integer (mcontext_addr
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+ ARM_MCONTEXT_VFP_PTR_OFFSET, 4,
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byte_order,
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&mcontext_vfp_addr)
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&& mcontext_vfp_addr != 0)
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trad_frame_set_reg_regmap (this_cache, arm_fbsd_vfpregmap, mcontext_vfp_addr,
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regcache_map_entry_size (arm_fbsd_vfpregmap));
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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 arm_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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{0xe1a0000d, ULONGEST_MAX}, /* mov r0, sp */
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{0xe2800040, ULONGEST_MAX}, /* add r0, r0, #SIGF_UC */
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{0xe59f700c, ULONGEST_MAX}, /* ldr r7, [pc, #12] */
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{0xef0001a1, ULONGEST_MAX}, /* swi SYS_sigreturn */
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{TRAMP_SENTINEL_INSN, ULONGEST_MAX}
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},
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arm_fbsd_sigframe_init
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};
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/* Register set definitions. */
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const struct regset arm_fbsd_gregset =
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{
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arm_fbsd_gregmap,
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regcache_supply_regset, regcache_collect_regset
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};
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const struct regset arm_fbsd_vfpregset =
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{
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arm_fbsd_vfpregmap,
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regcache_supply_regset, regcache_collect_regset
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};
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/* Implement the "regset_from_core_section" gdbarch method. */
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static void
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arm_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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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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cb (".reg", ARM_FBSD_SIZEOF_GREGSET, ARM_FBSD_SIZEOF_GREGSET,
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&arm_fbsd_gregset, NULL, cb_data);
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/* While FreeBSD/arm cores do contain a NT_FPREGSET / ".reg2"
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register set, it is not populated with register values by the
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kernel but just contains all zeroes. */
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if (tdep->vfp_register_count > 0)
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cb (".reg-arm-vfp", ARM_FBSD_SIZEOF_VFPREGSET, ARM_FBSD_SIZEOF_VFPREGSET,
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&arm_fbsd_vfpregset, "VFP floating-point", cb_data);
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}
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/* Lookup a target description from a target's AT_HWCAP auxiliary
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vector. */
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const struct target_desc *
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arm_fbsd_read_description_auxv (struct target_ops *target)
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{
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CORE_ADDR arm_hwcap = 0;
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if (target_auxv_search (target, AT_FREEBSD_HWCAP, &arm_hwcap) != 1)
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return nullptr;
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if (arm_hwcap & HWCAP_VFP)
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{
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if (arm_hwcap & HWCAP_NEON)
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return aarch32_read_description ();
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else if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPD32))
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== (HWCAP_VFPv3 | HWCAP_VFPD32))
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return arm_read_description (ARM_FP_TYPE_VFPV3);
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else
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return arm_read_description (ARM_FP_TYPE_VFPV2);
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}
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return nullptr;
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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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arm_fbsd_core_read_description (struct gdbarch *gdbarch,
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struct target_ops *target,
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bfd *abfd)
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{
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return arm_fbsd_read_description_auxv (target);
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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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arm_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
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{
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struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
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/* Generic FreeBSD support. */
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fbsd_init_abi (info, gdbarch);
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if (tdep->fp_model == ARM_FLOAT_AUTO)
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tdep->fp_model = ARM_FLOAT_SOFT_VFP;
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tramp_frame_prepend_unwinder (gdbarch, &arm_fbsd_sigframe);
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set_solib_svr4_fetch_link_map_offsets
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(gdbarch, svr4_ilp32_fetch_link_map_offsets);
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tdep->jb_pc = 24;
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tdep->jb_elt_size = 4;
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set_gdbarch_iterate_over_regset_sections
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(gdbarch, arm_fbsd_iterate_over_regset_sections);
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set_gdbarch_core_read_description (gdbarch, arm_fbsd_core_read_description);
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/* Single stepping. */
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set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
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}
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void
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_initialize_arm_fbsd_tdep (void)
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{
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gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_FREEBSD,
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arm_fbsd_init_abi);
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}
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