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