diff options
| -rw-r--r-- | gdb/ChangeLog | 9 | ||||
| -rw-r--r-- | gdb/Makefile.in | 2 | ||||
| -rw-r--r-- | gdb/NEWS | 1 | ||||
| -rw-r--r-- | gdb/arm-fbsd-tdep.c | 257 | ||||
| -rw-r--r-- | gdb/arm-fbsd-tdep.h | 40 | ||||
| -rw-r--r-- | gdb/configure.tgt | 4 |
6 files changed, 313 insertions, 0 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 6231638..6155c58 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,12 @@ +2017-10-11 John Baldwin <jhb@FreeBSD.org> + + * 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. + 2017-10-11 Maciej W. Rozycki <macro@imgtec.com> * linux-tdep.c (linux_make_corefile_notes): Remove call to diff --git a/gdb/Makefile.in b/gdb/Makefile.in index 18e7750..94461e2 100644 --- a/gdb/Makefile.in +++ b/gdb/Makefile.in @@ -798,6 +798,7 @@ ALL_TARGET_OBS = \ arch/arm-linux.o \ arch/i386.o \ arm-bsd-tdep.o \ + arm-fbsd-tdep.o \ arm-linux-tdep.o \ arm-nbsd-tdep.o \ arm-obsd-tdep.o \ @@ -2541,6 +2542,7 @@ ALLDEPFILES = \ arc-tdep.c \ arm.c \ arm-bsd-tdep.c \ + arm-fbsd-tdep.c \ arm-get-next-pcs.c \ arm-linux.c \ arm-linux-nat.c \ @@ -130,6 +130,7 @@ FreeBSD/aarch64 aarch64*-*-freebsd* * New targets FreeBSD/aarch64 aarch64*-*-freebsd* +FreeBSD/arm arm*-*-freebsd* * Removed targets and native configurations diff --git a/gdb/arm-fbsd-tdep.c b/gdb/arm-fbsd-tdep.c new file mode 100644 index 0000000..2bd944d --- /dev/null +++ b/gdb/arm-fbsd-tdep.c @@ -0,0 +1,257 @@ +/* Target-dependent code for FreeBSD/arm. + + Copyright (C) 2017 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 "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" + +/* 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_MCONTEXT_REG_SIZE 4 +#define ARM_MCONTEXT_VFP_REG_SIZE 8 +#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; + + for (int i = 0; i < 16; i++) + { + trad_frame_set_reg_addr (this_cache, + ARM_A1_REGNUM + i, + mcontext_addr + i * ARM_MCONTEXT_REG_SIZE); + } + trad_frame_set_reg_addr (this_cache, ARM_PS_REGNUM, + mcontext_addr + 16 * ARM_MCONTEXT_REG_SIZE); + + if (safe_read_memory_unsigned_integer (mcontext_addr + + ARM_MCONTEXT_VFP_PTR_OFFSET, 4, + byte_order, + &mcontext_vfp_addr) + && mcontext_vfp_addr != 0) + { + for (int i = 0; i < 32; i++) + { + trad_frame_set_reg_addr (this_cache, ARM_D0_REGNUM + i, + mcontext_vfp_addr + + i * ARM_MCONTEXT_VFP_REG_SIZE); + } + trad_frame_set_reg_addr (this_cache, ARM_FPSCR_REGNUM, + mcontext_vfp_addr + + 32 * ARM_MCONTEXT_VFP_REG_SIZE); + } + + trad_frame_set_id (this_cache, frame_id_build (sp, func)); +} + +static const struct tramp_frame arm_fbsd_sigframe = +{ + SIGTRAMP_FRAME, + 4, + { + {0xe1a0000d, -1}, /* mov r0, sp */ + {0xe2800040, -1}, /* add r0, r0, #SIGF_UC */ + {0xe59f700c, -1}, /* ldr r7, [pc, #12] */ + {0xef0001a1, -1}, /* swi SYS_sigreturn */ + {TRAMP_SENTINEL_INSN, -1} + }, + arm_fbsd_sigframe_init +}; + +/* 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 } + }; + +/* 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 "regset_from_core_section" 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) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + cb (".reg", 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_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 NULL; + + if (arm_hwcap & HWCAP_VFP) + { + if (arm_hwcap & HWCAP_NEON) + return tdesc_arm_with_neon; + else if ((arm_hwcap & (HWCAP_VFPv3 | HWCAP_VFPD32)) + == (HWCAP_VFPv3 | HWCAP_VFPD32)) + return tdesc_arm_with_vfpv3; + else + return tdesc_arm_with_vfpv2; + } + + return NULL; +} + +/* 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) +{ + struct gdbarch_tdep *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) +{ + gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_FREEBSD, + arm_fbsd_init_abi); +} diff --git a/gdb/arm-fbsd-tdep.h b/gdb/arm-fbsd-tdep.h new file mode 100644 index 0000000..8717b80 --- /dev/null +++ b/gdb/arm-fbsd-tdep.h @@ -0,0 +1,40 @@ +/* FreeBSD/arm target support, prototypes. + + Copyright (C) 2017 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 "regset.h" + +/* The general-purpose regset consists of 13 R registers, plus SP, LR, + PC, and CPSR registers. */ +#define ARM_FBSD_SIZEOF_GREGSET (17 * 4) + +/* The VFP regset consists of 32 D registers plus FPSCR, and the whole + structure is padded to 64-bit alignment. */ +#define ARM_FBSD_SIZEOF_VFPREGSET (33 * 8) + +extern const struct regset arm_fbsd_gregset; +extern const struct regset arm_fbsd_vfpregset; + +/* Flags passed in AT_HWCAP. */ +#define HWCAP_VFP 0x00000040 +#define HWCAP_NEON 0x00001000 +#define HWCAP_VFPv3 0x00002000 +#define HWCAP_VFPD32 0x00080000 + +extern const struct target_desc * +arm_fbsd_read_description_auxv (struct target_ops *target); diff --git a/gdb/configure.tgt b/gdb/configure.tgt index f8677b4..1fce079 100644 --- a/gdb/configure.tgt +++ b/gdb/configure.tgt @@ -160,6 +160,10 @@ arm*-*-linux*) solib-svr4.o symfile-mem.o linux-tdep.o linux-record.o" build_gdbserver=yes ;; +arm*-*-freebsd*) + # Target: FreeBSD/arm + gdb_target_obs="arm-fbsd-tdep.o" + ;; arm*-*-netbsd* | arm*-*-knetbsd*-gnu) # Target: NetBSD/arm gdb_target_obs="arm-nbsd-tdep.o" |