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Add FreeBSD/arm architecture.
Support for collecting and supplying general purpose and floating point registers is provided along with signal frame unwinding. While FreeBSD/arm kernels do populate NT_FPREGSET notes, they are always zero-filled, so this implementation ignores them. Recent FreeBSD/arm kernels generate NT_ARM_VFP notes which are used to supply floating-point registers. As with Linux, the AT_HWCAP feature flags are used to determine the correct target description. gdb/ChangeLog: * Makefile.in (ALL_TARGET_OBS): Add arm-fbsd-tdep.o. (ALLDEPFILES): Add arm-fbsd-tdep.c. * NEWS: Mention new FreeBSD/arm target. * configure.tgt: Add arm*-*-freebsd*. * arm-fbsd-tdep.c: New file. * arm-fbsd-tdep.h: New file.
This commit is contained in:
John Baldwin
parent
39865a7f42
commit
7176dfd28d
@ -1,3 +1,12 @@
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2017-10-11 John Baldwin <jhb@FreeBSD.org>
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* Makefile.in (ALL_TARGET_OBS): Add arm-fbsd-tdep.o.
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(ALLDEPFILES): Add arm-fbsd-tdep.c.
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* NEWS: Mention new FreeBSD/arm target.
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* configure.tgt: Add arm*-*-freebsd*.
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* arm-fbsd-tdep.c: New file.
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* arm-fbsd-tdep.h: New file.
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2017-10-11 Maciej W. Rozycki <macro@imgtec.com>
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* linux-tdep.c (linux_make_corefile_notes): Remove call to
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@ -798,6 +798,7 @@ ALL_TARGET_OBS = \
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arch/arm-linux.o \
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arch/i386.o \
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arm-bsd-tdep.o \
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arm-fbsd-tdep.o \
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arm-linux-tdep.o \
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arm-nbsd-tdep.o \
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arm-obsd-tdep.o \
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@ -2541,6 +2542,7 @@ ALLDEPFILES = \
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arc-tdep.c \
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arm.c \
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arm-bsd-tdep.c \
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arm-fbsd-tdep.c \
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arm-get-next-pcs.c \
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arm-linux.c \
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arm-linux-nat.c \
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1
gdb/NEWS
1
gdb/NEWS
@ -130,6 +130,7 @@ FreeBSD/aarch64 aarch64*-*-freebsd*
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* New targets
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FreeBSD/aarch64 aarch64*-*-freebsd*
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FreeBSD/arm arm*-*-freebsd*
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* Removed targets and native configurations
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257
gdb/arm-fbsd-tdep.c
Normal file
257
gdb/arm-fbsd-tdep.c
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@ -0,0 +1,257 @@
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/* Target-dependent code for FreeBSD/arm.
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Copyright (C) 2017 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 "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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/* 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_MCONTEXT_REG_SIZE 4
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#define ARM_MCONTEXT_VFP_REG_SIZE 8
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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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for (int i = 0; i < 16; i++)
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{
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trad_frame_set_reg_addr (this_cache,
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ARM_A1_REGNUM + i,
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mcontext_addr + i * ARM_MCONTEXT_REG_SIZE);
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}
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trad_frame_set_reg_addr (this_cache, ARM_PS_REGNUM,
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mcontext_addr + 16 * ARM_MCONTEXT_REG_SIZE);
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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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{
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for (int i = 0; i < 32; i++)
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{
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trad_frame_set_reg_addr (this_cache, ARM_D0_REGNUM + i,
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mcontext_vfp_addr
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+ i * ARM_MCONTEXT_VFP_REG_SIZE);
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}
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trad_frame_set_reg_addr (this_cache, ARM_FPSCR_REGNUM,
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mcontext_vfp_addr
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+ 32 * ARM_MCONTEXT_VFP_REG_SIZE);
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}
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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, -1}, /* mov r0, sp */
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{0xe2800040, -1}, /* add r0, r0, #SIGF_UC */
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{0xe59f700c, -1}, /* ldr r7, [pc, #12] */
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{0xef0001a1, -1}, /* swi SYS_sigreturn */
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{TRAMP_SENTINEL_INSN, -1}
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},
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arm_fbsd_sigframe_init
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};
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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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/* 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_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_vfpregset,
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"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 NULL;
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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 tdesc_arm_with_neon;
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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 tdesc_arm_with_vfpv3;
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else
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return tdesc_arm_with_vfpv2;
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}
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return NULL;
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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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40
gdb/arm-fbsd-tdep.h
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40
gdb/arm-fbsd-tdep.h
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@ -0,0 +1,40 @@
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/* FreeBSD/arm target support, prototypes.
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Copyright (C) 2017 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 "regset.h"
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/* The general-purpose regset consists of 13 R registers, plus SP, LR,
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PC, and CPSR registers. */
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#define ARM_FBSD_SIZEOF_GREGSET (17 * 4)
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/* The VFP regset consists of 32 D registers plus FPSCR, and the whole
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structure is padded to 64-bit alignment. */
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#define ARM_FBSD_SIZEOF_VFPREGSET (33 * 8)
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extern const struct regset arm_fbsd_gregset;
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extern const struct regset arm_fbsd_vfpregset;
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/* Flags passed in AT_HWCAP. */
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#define HWCAP_VFP 0x00000040
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#define HWCAP_NEON 0x00001000
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#define HWCAP_VFPv3 0x00002000
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#define HWCAP_VFPD32 0x00080000
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extern const struct target_desc *
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arm_fbsd_read_description_auxv (struct target_ops *target);
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@ -160,6 +160,10 @@ arm*-*-linux*)
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solib-svr4.o symfile-mem.o linux-tdep.o linux-record.o"
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build_gdbserver=yes
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;;
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arm*-*-freebsd*)
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# Target: FreeBSD/arm
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gdb_target_obs="arm-fbsd-tdep.o"
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;;
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arm*-*-netbsd* | arm*-*-knetbsd*-gnu)
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# Target: NetBSD/arm
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gdb_target_obs="arm-nbsd-tdep.o"
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