Re: [PATCH v3 2/3] Add FreeBSD/mips architecture.

Luis Machado
2017-01-04T21:23:24Z

Hi,

Did this get pushed? I thought we were waiting for Maciej to provide
feedback?

Also please note i only review, i don't approve. Mark Kettenis would be
the one to approve native FreeBSD bits (if the MAINTAINERS file is still
up-to-date).

Or maybe that has changed? If so, the MAINTAINERS file needs to be updated.

On 01/03/2017 12:43 PM, John Baldwin wrote:
> This has been tested for the n64 and o32 ABIs. Signal frame unwinders for
> both ABIs are provided. FreeBSD/mips requires custom linkmap offsets since
> it contains an additional l_off member in 'struct link_map' that other
> FreeBSD platforms do not have. Support for collecting and supplying
> general purpose and floating point register sets are provided. Common
> routines for working with native format register sets are exported for
> use by the native target.
>
> gdb/ChangeLog:
>
> * Makefile.in (ALL_TARGET_OBS): Add mips-fbsd-tdep.o.
> (ALLDEPFILES): Add mips-fbsd-tdep.c.
> * NEWS: Mention new FreeBSD/mips target.
> * configure.tgt: Add mips*-*-freebsd*.
> * mips-fbsd-tdep.c: New file.
> * mips-fbsd-tdep.h: New file.
>
> gdb/doc/ChangeLog:
>
> * gdb.texinfo (Contributors): Add SRI International and University
> of Cambridge for FreeBSD/mips.
> ---
> gdb/ChangeLog | 9 +
> gdb/Makefile.in | 2 +
> gdb/NEWS | 1 +
> gdb/configure.tgt | 5 +
> gdb/doc/ChangeLog | 5 +
> gdb/doc/gdb.texinfo | 5 +
> gdb/mips-fbsd-tdep.c | 560 +++++++++++++++++++++++++++++++++++++++++++++++++++
> gdb/mips-fbsd-tdep.h | 28 +++
> 8 files changed, 615 insertions(+)
> create mode 100644 gdb/mips-fbsd-tdep.c
> create mode 100644 gdb/mips-fbsd-tdep.h
>
> diff --git a/gdb/ChangeLog b/gdb/ChangeLog
> index 2837a9da58..dea01e7025 100644
> --- a/gdb/ChangeLog
> +++ b/gdb/ChangeLog
> @@ -1,3 +1,12 @@
> +2017-01-03 John Baldwin <jhb@FreeBSD.org>
> +
> + * Makefile.in (ALL_TARGET_OBS): Add mips-fbsd-tdep.o.
> + (ALLDEPFILES): Add mips-fbsd-tdep.c.
> + * NEWS: Mention new FreeBSD/mips target.
> + * configure.tgt: Add mips*-*-freebsd*.
> + * mips-fbsd-tdep.c: New file.
> + * mips-fbsd-tdep.h: New file.
> +
> 2017-01-01 Joel Brobecker <brobecker@adacore.com>
>
> Update copyright year range in all GDB files.
> diff --git a/gdb/Makefile.in b/gdb/Makefile.in
> index 006ff64282..f20b97347a 100644
> --- a/gdb/Makefile.in
> +++ b/gdb/Makefile.in
> @@ -817,6 +817,7 @@ ALL_TARGET_OBS = \
> mep-tdep.o \
> microblaze-linux-tdep.o \
> microblaze-tdep.o \
> + mips-fbsd-tdep.o \
> mips-linux-tdep.o \
> mips-nbsd-tdep.o \
> mips-sde-tdep.o \
> @@ -2540,6 +2541,7 @@ ALLDEPFILES = \
> microblaze-linux-tdep.c \
> microblaze-tdep.c \
> mingw-hdep.c \
> + mips-fbsd-tdep.c \
> mips-linux-nat.c \
> mips-linux-tdep.c \
> mips-nbsd-nat.c \
> diff --git a/gdb/NEWS b/gdb/NEWS
> index 12d57fb4a5..f7fe9aeb76 100644
> --- a/gdb/NEWS
> +++ b/gdb/NEWS
> @@ -50,6 +50,7 @@
> * New targets
>
> Synopsys ARC arc*-*-elf32
> +FreeBSD/mips mips*-*-freebsd
>
> *** Changes in GDB 7.12
>
> diff --git a/gdb/configure.tgt b/gdb/configure.tgt
> index 3f2603ddb7..cb909e7f5e 100644
> --- a/gdb/configure.tgt
> +++ b/gdb/configure.tgt
> @@ -369,6 +369,11 @@ mips*-*-netbsd* | mips*-*-knetbsd*-gnu)
> gdb_target_obs="mips-tdep.o mips-nbsd-tdep.o solib-svr4.o nbsd-tdep.o"
> gdb_sim=../sim/mips/libsim.a
> ;;
> +mips*-*-freebsd*)
> + # Target: MIPS running FreeBSD
> + gdb_target_obs="mips-tdep.o mips-fbsd-tdep.o solib-svr4.o fbsd-tdep.o"
> + gdb_sim=../sim/mips/libsim.a
> + ;;
> mips64*-*-openbsd*)
> # Target: OpenBSD/mips64
> gdb_target_obs="mips-tdep.o mips64-obsd-tdep.o obsd-tdep.o solib-svr4.o"
> diff --git a/gdb/doc/ChangeLog b/gdb/doc/ChangeLog
> index eb6e82a8f7..cf68cbeb27 100644
> --- a/gdb/doc/ChangeLog
> +++ b/gdb/doc/ChangeLog
> @@ -1,3 +1,8 @@
> +2017-01-03 John Baldwin <jhb@FreeBSD.org>
> +
> + * gdb.texinfo (Contributors): Add SRI International and University
> + of Cambridge for FreeBSD/mips.
> +
> 2016-12-22 Doug Evans <xdje42@gmail.com>
>
> * gdb.texinfo (Symbols): Update docs for symbol printing maintenance
> diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
> index ccb95ad70e..2b6b6547c5 100644
> --- a/gdb/doc/gdb.texinfo
> +++ b/gdb/doc/gdb.texinfo
> @@ -541,6 +541,11 @@ Steve Tjiang, John Newlin, and Scott Foehner.
> Michael Eager and staff of Xilinx, Inc., contributed support for the
> Xilinx MicroBlaze architecture.
>
> +Initial support for the FreeBSD/mips target and native configuration
> +was developed by SRI International and the University of Cambridge
> +Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237
> +("CTSRD"), as part of the DARPA CRASH research programme.
> +
> @node Sample Session
> @chapter A Sample @value{GDBN} Session
>
> diff --git a/gdb/mips-fbsd-tdep.c b/gdb/mips-fbsd-tdep.c
> new file mode 100644
> index 0000000000..09bb19a56d
> --- /dev/null
> +++ b/gdb/mips-fbsd-tdep.c
> @@ -0,0 +1,560 @@
> +/* Target-dependent code for FreeBSD/mips.
> +
> + Copyright (C) 2016 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 "osabi.h"
> +#include "regset.h"
> +#include "trad-frame.h"
> +#include "tramp-frame.h"
> +
> +#include "fbsd-tdep.h"
> +#include "mips-tdep.h"
> +#include "mips-fbsd-tdep.h"
> +
> +#include "solib-svr4.h"
> +
> +/* Shorthand for some register numbers used below. */
> +#define MIPS_PC_REGNUM MIPS_EMBED_PC_REGNUM
> +#define MIPS_FP0_REGNUM MIPS_EMBED_FP0_REGNUM
> +#define MIPS_FSR_REGNUM MIPS_EMBED_FP0_REGNUM + 32
> +
> +/* Core file support. */
> +
> +/* Number of registers in `struct reg' from <machine/reg.h>. The
> + first 38 follow the standard MIPS layout. The 39th holds
> + IC_INT_REG on RM7K and RM9K processors. The 40th is a dummy for
> + padding. */
> +#define MIPS_FBSD_NUM_GREGS 40
> +
> +/* Number of registers in `struct fpreg' from <machine/reg.h>. The
> + first 32 hold floating point registers. 33 holds the FSR. The
> + 34th is a dummy for padding. */
> +#define MIPS_FBSD_NUM_FPREGS 34
> +
> +/* Supply a single register. If the source register size matches the
> + size the regcache expects, this can use regcache_raw_supply(). If
> + they are different, this copies the source register into a buffer
> + that can be passed to regcache_raw_supply(). */
> +
> +static void
> +mips_fbsd_supply_reg (struct regcache *regcache, int regnum, const void *addr,
> + size_t len)
> +{
> + struct gdbarch *gdbarch = get_regcache_arch (regcache);
> +
> + if (register_size (gdbarch, regnum) == len)
> + regcache_raw_supply (regcache, regnum, addr);
> + else
> + {
> + enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
> + gdb_byte buf[MAX_REGISTER_SIZE];
> + LONGEST val;
> +
> + val = extract_signed_integer ((const gdb_byte *) addr, len, byte_order);
> + store_signed_integer (buf, register_size (gdbarch, regnum), byte_order,
> + val);
> + regcache_raw_supply (regcache, regnum, buf);
> + }
> +}
> +
> +/* Collect a single register. If the destination register size
> + matches the size the regcache expects, this can use
> + regcache_raw_supply(). If they are different, this fetches the
> + register via regcache_raw_supply() into a buffer and then copies it
> + into the final destination. */
> +
> +static void
> +mips_fbsd_collect_reg (const struct regcache *regcache, int regnum, void *addr,
> + size_t len)
> +{
> + struct gdbarch *gdbarch = get_regcache_arch (regcache);
> +
> + if (register_size (gdbarch, regnum) == len)
> + regcache_raw_collect (regcache, regnum, addr);
> + else
> + {
> + enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
> + gdb_byte buf[MAX_REGISTER_SIZE];
> + LONGEST val;
> +
> + regcache_raw_collect (regcache, regnum, buf);
> + val = extract_signed_integer (buf, register_size (gdbarch, regnum),
> + byte_order);
> + store_signed_integer ((gdb_byte *) addr, len, byte_order, val);
> + }
> +}
> +
> +/* Supply the floating-point registers stored in FPREGS to REGCACHE.
> + Each floating-point register in FPREGS is REGSIZE bytes in
> + length. */
> +
> +void
> +mips_fbsd_supply_fpregs (struct regcache *regcache, int regnum,
> + const void *fpregs, size_t regsize)
> +{
> + const gdb_byte *regs = (const gdb_byte *) fpregs;
> + int i;
> +
> + for (i = MIPS_FP0_REGNUM; i <= MIPS_FSR_REGNUM; i++)
> + if (regnum == i || regnum == -1)
> + mips_fbsd_supply_reg (regcache, i,
> + regs + (i - MIPS_FP0_REGNUM) * regsize, regsize);
> +}
> +
> +/* Supply the general-purpose registers stored in GREGS to REGCACHE.
> + Each general-purpose register in GREGS is REGSIZE bytes in
> + length. */
> +
> +void
> +mips_fbsd_supply_gregs (struct regcache *regcache, int regnum,
> + const void *gregs, size_t regsize)
> +{
> + const gdb_byte *regs = (const gdb_byte *) gregs;
> + int i;
> +
> + for (i = 0; i <= MIPS_PC_REGNUM; i++)
> + if (regnum == i || regnum == -1)
> + mips_fbsd_supply_reg (regcache, i, regs + i * regsize, regsize);
> +}
> +
> +/* Collect the floating-point registers from REGCACHE and store them
> + in FPREGS. Each floating-point register in FPREGS is REGSIZE bytes
> + in length. */
> +
> +void
> +mips_fbsd_collect_fpregs (const struct regcache *regcache, int regnum,
> + void *fpregs, size_t regsize)
> +{
> + gdb_byte *regs = (gdb_byte *) fpregs;
> + int i;
> +
> + for (i = MIPS_FP0_REGNUM; i <= MIPS_FSR_REGNUM; i++)
> + if (regnum == i || regnum == -1)
> + mips_fbsd_collect_reg (regcache, i,
> + regs + (i - MIPS_FP0_REGNUM) * regsize, regsize);
> +}
> +
> +/* Collect the general-purpose registers from REGCACHE and store them
> + in GREGS. Each general-purpose register in GREGS is REGSIZE bytes
> + in length. */
> +
> +void
> +mips_fbsd_collect_gregs (const struct regcache *regcache, int regnum,
> + void *gregs, size_t regsize)
> +{
> + gdb_byte *regs = (gdb_byte *) gregs;
> + int i;
> +
> + for (i = 0; i <= MIPS_PC_REGNUM; i++)
> + if (regnum == i || regnum == -1)
> + mips_fbsd_collect_reg (regcache, i, regs + i * regsize, regsize);
> +}
> +
> +/* Supply register REGNUM from the buffer specified by FPREGS and LEN
> + in the floating-point register set REGSET to register cache
> + REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
> +
> +static void
> +mips_fbsd_supply_fpregset (const struct regset *regset,
> + struct regcache *regcache,
> + int regnum, const void *fpregs, size_t len)
> +{
> + size_t regsize = mips_abi_regsize (get_regcache_arch (regcache));
> +
> + gdb_assert (len >= MIPS_FBSD_NUM_FPREGS * regsize);
> +
> + mips_fbsd_supply_fpregs (regcache, regnum, fpregs, regsize);
> +}
> +
> +/* Collect register REGNUM from the register cache REGCACHE and store
> + it in the buffer specified by FPREGS and LEN in the floating-point
> + register set REGSET. If REGNUM is -1, do this for all registers in
> + REGSET. */
> +
> +static void
> +mips_fbsd_collect_fpregset (const struct regset *regset,
> + const struct regcache *regcache,
> + int regnum, void *fpregs, size_t len)
> +{
> + size_t regsize = mips_abi_regsize (get_regcache_arch (regcache));
> +
> + gdb_assert (len >= MIPS_FBSD_NUM_FPREGS * regsize);
> +
> + mips_fbsd_collect_fpregs (regcache, regnum, fpregs, regsize);
> +}
> +
> +/* Supply register REGNUM from the buffer specified by GREGS and LEN
> + in the general-purpose register set REGSET to register cache
> + REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
> +
> +static void
> +mips_fbsd_supply_gregset (const struct regset *regset,
> + struct regcache *regcache, int regnum,
> + const void *gregs, size_t len)
> +{
> + size_t regsize = mips_abi_regsize (get_regcache_arch (regcache));
> +
> + gdb_assert (len >= MIPS_FBSD_NUM_GREGS * regsize);
> +
> + mips_fbsd_supply_gregs (regcache, regnum, gregs, regsize);
> +}
> +
> +/* Collect register REGNUM from the register cache REGCACHE and store
> + it in the buffer specified by GREGS and LEN in the general-purpose
> + register set REGSET. If REGNUM is -1, do this for all registers in
> + REGSET. */
> +
> +static void
> +mips_fbsd_collect_gregset (const struct regset *regset,
> + const struct regcache *regcache,
> + int regnum, void *gregs, size_t len)
> +{
> + size_t regsize = mips_abi_regsize (get_regcache_arch (regcache));
> +
> + gdb_assert (len >= MIPS_FBSD_NUM_GREGS * regsize);
> +
> + mips_fbsd_collect_gregs (regcache, regnum, gregs, regsize);
> +}
> +
> +/* FreeBSD/mips register sets. */
> +
> +static const struct regset mips_fbsd_gregset =
> +{
> + NULL,
> + mips_fbsd_supply_gregset,
> + mips_fbsd_collect_gregset,
> +};
> +
> +static const struct regset mips_fbsd_fpregset =
> +{
> + NULL,
> + mips_fbsd_supply_fpregset,
> + mips_fbsd_collect_fpregset,
> +};
> +
> +/* Iterate over core file register note sections. */
> +
> +static void
> +mips_fbsd_iterate_over_regset_sections (struct gdbarch *gdbarch,
> + iterate_over_regset_sections_cb *cb,
> + void *cb_data,
> + const struct regcache *regcache)
> +{
> + size_t regsize = mips_abi_regsize (gdbarch);
> +
> + cb (".reg", MIPS_FBSD_NUM_GREGS * regsize, &mips_fbsd_gregset,
> + NULL, cb_data);
> + cb (".reg2", MIPS_FBSD_NUM_FPREGS * regsize, &mips_fbsd_fpregset,
> + NULL, cb_data);
> +}
> +
> +/* Signal trampoline support. */
> +
> +#define FBSD_SYS_sigreturn 417
> +
> +#define MIPS_INST_LI_V0_SIGRETURN 0x24020000 + FBSD_SYS_sigreturn
> +#define MIPS_INST_SYSCALL 0x0000000c
> +#define MIPS_INST_BREAK 0x0000000d
> +
> +#define O32_SIGFRAME_UCONTEXT_OFFSET (16)
> +#define O32_SIGSET_T_SIZE (16)
> +
> +#define O32_UCONTEXT_ONSTACK (O32_SIGSET_T_SIZE)
> +#define O32_UCONTEXT_PC (O32_UCONTEXT_ONSTACK + 4)
> +#define O32_UCONTEXT_REGS (O32_UCONTEXT_PC + 4)
> +#define O32_UCONTEXT_SR (O32_UCONTEXT_REGS + 4 * 32)
> +#define O32_UCONTEXT_LO (O32_UCONTEXT_SR + 4)
> +#define O32_UCONTEXT_HI (O32_UCONTEXT_LO + 4)
> +#define O32_UCONTEXT_FPUSED (O32_UCONTEXT_HI + 4)
> +#define O32_UCONTEXT_FPREGS (O32_UCONTEXT_FPUSED + 4)
> +
> +#define O32_UCONTEXT_REG_SIZE 4
> +
> +static void
> +mips_fbsd_sigframe_init (const struct tramp_frame *self,
> + struct frame_info *this_frame,
> + struct trad_frame_cache *cache,
> + CORE_ADDR func)
> +{
> + struct gdbarch *gdbarch = get_frame_arch (this_frame);
> + enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
> + CORE_ADDR sp, ucontext_addr, addr;
> + int regnum;
> + gdb_byte buf[4];
> +
> + /* We find the appropriate instance of `ucontext_t' at a
> + fixed offset in the signal frame. */
> + sp = get_frame_register_signed (this_frame,
> + MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch));
> + ucontext_addr = sp + O32_SIGFRAME_UCONTEXT_OFFSET;
> +
> + /* PC. */
> + regnum = mips_regnum (gdbarch)->pc;
> + trad_frame_set_reg_addr (cache,
> + regnum + gdbarch_num_regs (gdbarch),
> + ucontext_addr + O32_UCONTEXT_PC);
> +
> + /* GPRs. */
> + for (regnum = MIPS_ZERO_REGNUM, addr = ucontext_addr + O32_UCONTEXT_REGS;
> + regnum <= MIPS_RA_REGNUM; regnum++, addr += O32_UCONTEXT_REG_SIZE)
> + trad_frame_set_reg_addr (cache,
> + regnum + gdbarch_num_regs (gdbarch),
> + addr);
> +
> + regnum = MIPS_PS_REGNUM;
> + trad_frame_set_reg_addr (cache,
> + regnum + gdbarch_num_regs (gdbarch),
> + ucontext_addr + O32_UCONTEXT_SR);
> +
> + /* HI and LO. */
> + regnum = mips_regnum (gdbarch)->lo;
> + trad_frame_set_reg_addr (cache,
> + regnum + gdbarch_num_regs (gdbarch),
> + ucontext_addr + O32_UCONTEXT_LO);
> + regnum = mips_regnum (gdbarch)->hi;
> + trad_frame_set_reg_addr (cache,
> + regnum + gdbarch_num_regs (gdbarch),
> + ucontext_addr + O32_UCONTEXT_HI);
> +
> + if (target_read_memory (ucontext_addr + O32_UCONTEXT_FPUSED, buf, 4) == 0 &&
> + extract_unsigned_integer (buf, 4, byte_order) != 0)
> + {
> + for (regnum = 0, addr = ucontext_addr + O32_UCONTEXT_FPREGS;
> + regnum < 32; regnum++, addr += O32_UCONTEXT_REG_SIZE)
> + trad_frame_set_reg_addr (cache,
> + regnum + gdbarch_fp0_regnum (gdbarch),
> + addr);
> + trad_frame_set_reg_addr (cache, mips_regnum (gdbarch)->fp_control_status,
> + addr);
> + }
> +
> + trad_frame_set_id (cache, frame_id_build (sp, func));
> +}
> +
> +#define MIPS_INST_ADDIU_A0_SP_O32 (0x27a40000 \
> + + O32_SIGFRAME_UCONTEXT_OFFSET)
> +
> +static const struct tramp_frame mips_fbsd_sigframe =
> +{
> + SIGTRAMP_FRAME,
> + MIPS_INSN32_SIZE,
> + {
> + { MIPS_INST_ADDIU_A0_SP_O32, -1 }, /* addiu a0, sp, SIGF_UC */
> + { MIPS_INST_LI_V0_SIGRETURN, -1 }, /* li v0, SYS_sigreturn */
> + { MIPS_INST_SYSCALL, -1 }, /* syscall */
> + { MIPS_INST_BREAK, -1 }, /* break */
> + { TRAMP_SENTINEL_INSN, -1 }
> + },
> + mips_fbsd_sigframe_init
> +};
> +
> +#define N64_SIGFRAME_UCONTEXT_OFFSET (32)
> +#define N64_SIGSET_T_SIZE (16)
> +
> +#define N64_UCONTEXT_ONSTACK (N64_SIGSET_T_SIZE)
> +#define N64_UCONTEXT_PC (N64_UCONTEXT_ONSTACK + 8)
> +#define N64_UCONTEXT_REGS (N64_UCONTEXT_PC + 8)
> +#define N64_UCONTEXT_SR (N64_UCONTEXT_REGS + 8 * 32)
> +#define N64_UCONTEXT_LO (N64_UCONTEXT_SR + 8)
> +#define N64_UCONTEXT_HI (N64_UCONTEXT_LO + 8)
> +#define N64_UCONTEXT_FPUSED (N64_UCONTEXT_HI + 8)
> +#define N64_UCONTEXT_FPREGS (N64_UCONTEXT_FPUSED + 8)
> +
> +#define N64_UCONTEXT_REG_SIZE 8
> +
> +static void
> +mips64_fbsd_sigframe_init (const struct tramp_frame *self,
> + struct frame_info *this_frame,
> + struct trad_frame_cache *cache,
> + CORE_ADDR func)
> +{
> + struct gdbarch *gdbarch = get_frame_arch (this_frame);
> + enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
> + CORE_ADDR sp, ucontext_addr, addr;
> + int regnum;
> + gdb_byte buf[4];
> +
> + /* We find the appropriate instance of `ucontext_t' at a
> + fixed offset in the signal frame. */
> + sp = get_frame_register_signed (this_frame,
> + MIPS_SP_REGNUM + gdbarch_num_regs (gdbarch));
> + ucontext_addr = sp + N64_SIGFRAME_UCONTEXT_OFFSET;
> +
> + /* PC. */
> + regnum = mips_regnum (gdbarch)->pc;
> + trad_frame_set_reg_addr (cache,
> + regnum + gdbarch_num_regs (gdbarch),
> + ucontext_addr + N64_UCONTEXT_PC);
> +
> + /* GPRs. */
> + for (regnum = MIPS_ZERO_REGNUM, addr = ucontext_addr + N64_UCONTEXT_REGS;
> + regnum <= MIPS_RA_REGNUM; regnum++, addr += N64_UCONTEXT_REG_SIZE)
> + trad_frame_set_reg_addr (cache,
> + regnum + gdbarch_num_regs (gdbarch),
> + addr);
> +
> + regnum = MIPS_PS_REGNUM;
> + trad_frame_set_reg_addr (cache,
> + regnum + gdbarch_num_regs (gdbarch),
> + ucontext_addr + N64_UCONTEXT_SR);
> +
> + /* HI and LO. */
> + regnum = mips_regnum (gdbarch)->lo;
> + trad_frame_set_reg_addr (cache,
> + regnum + gdbarch_num_regs (gdbarch),
> + ucontext_addr + N64_UCONTEXT_LO);
> + regnum = mips_regnum (gdbarch)->hi;
> + trad_frame_set_reg_addr (cache,
> + regnum + gdbarch_num_regs (gdbarch),
> + ucontext_addr + N64_UCONTEXT_HI);
> +
> + if (target_read_memory (ucontext_addr + N64_UCONTEXT_FPUSED, buf, 4) == 0 &&
> + extract_unsigned_integer (buf, 4, byte_order) != 0)
> + {
> + for (regnum = 0, addr = ucontext_addr + N64_UCONTEXT_FPREGS;
> + regnum < 32; regnum++, addr += N64_UCONTEXT_REG_SIZE)
> + trad_frame_set_reg_addr (cache,
> + regnum + gdbarch_fp0_regnum (gdbarch),
> + addr);
> + trad_frame_set_reg_addr (cache, mips_regnum (gdbarch)->fp_control_status,
> + addr);
> + }
> +
> + trad_frame_set_id (cache, frame_id_build (sp, func));
> +}
> +
> +#define MIPS_INST_DADDIU_A0_SP_N64 (0x67a40000 \
> + + N64_SIGFRAME_UCONTEXT_OFFSET)
> +
> +static const struct tramp_frame mips64_fbsd_sigframe =
> +{
> + SIGTRAMP_FRAME,
> + MIPS_INSN32_SIZE,
> + {
> + { MIPS_INST_DADDIU_A0_SP_N64, -1 }, /* daddiu a0, sp, SIGF_UC */
> + { MIPS_INST_LI_V0_SIGRETURN, -1 }, /* li v0, SYS_sigreturn */
> + { MIPS_INST_SYSCALL, -1 }, /* syscall */
> + { MIPS_INST_BREAK, -1 }, /* break */
> + { TRAMP_SENTINEL_INSN, -1 }
> + },
> + mips64_fbsd_sigframe_init
> +};
> +
> +/* Shared library support. */
> +
> +/* FreeBSD/mips uses a slightly different `struct link_map' than the
> + other FreeBSD platforms as it includes an additional `l_off'
> + member. */
> +
> +static struct link_map_offsets *
> +mips_fbsd_ilp32_fetch_link_map_offsets (void)
> +{
> + static struct link_map_offsets lmo;
> + static struct link_map_offsets *lmp = NULL;
> +
> + if (lmp == NULL)
> + {
> + lmp = &lmo;
> +
> + lmo.r_version_offset = 0;
> + lmo.r_version_size = 4;
> + lmo.r_map_offset = 4;
> + lmo.r_brk_offset = 8;
> + lmo.r_ldsomap_offset = -1;
> +
> + lmo.link_map_size = 24;
> + lmo.l_addr_offset = 0;
> + lmo.l_name_offset = 8;
> + lmo.l_ld_offset = 12;
> + lmo.l_next_offset = 16;
> + lmo.l_prev_offset = 20;
> + }
> +
> + return lmp;
> +}
> +
> +static struct link_map_offsets *
> +mips_fbsd_lp64_fetch_link_map_offsets (void)
> +{
> + static struct link_map_offsets lmo;
> + static struct link_map_offsets *lmp = NULL;
> +
> + if (lmp == NULL)
> + {
> + lmp = &lmo;
> +
> + lmo.r_version_offset = 0;
> + lmo.r_version_size = 4;
> + lmo.r_map_offset = 8;
> + lmo.r_brk_offset = 16;
> + lmo.r_ldsomap_offset = -1;
> +
> + lmo.link_map_size = 48;
> + lmo.l_addr_offset = 0;
> + lmo.l_name_offset = 16;
> + lmo.l_ld_offset = 24;
> + lmo.l_next_offset = 32;
> + lmo.l_prev_offset = 40;
> + }
> +
> + return lmp;
> +}
> +
> +static void
> +mips_fbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
> +{
> + enum mips_abi abi = mips_abi (gdbarch);
> +
> + /* Generic FreeBSD support. */
> + fbsd_init_abi (info, gdbarch);
> +
> + set_gdbarch_software_single_step (gdbarch, mips_software_single_step);
> +
> + switch (abi)
> + {
> + case MIPS_ABI_O32:
> + tramp_frame_prepend_unwinder (gdbarch, &mips_fbsd_sigframe);
> + break;
> + case MIPS_ABI_N32:
> + break;
> + case MIPS_ABI_N64:
> + tramp_frame_prepend_unwinder (gdbarch, &mips64_fbsd_sigframe);
> + break;
> + }
> +
> + set_gdbarch_iterate_over_regset_sections
> + (gdbarch, mips_fbsd_iterate_over_regset_sections);
> +
> + /* FreeBSD/mips has SVR4-style shared libraries. */
> + set_solib_svr4_fetch_link_map_offsets
> + (gdbarch, (gdbarch_ptr_bit (gdbarch) == 32 ?
> + mips_fbsd_ilp32_fetch_link_map_offsets :
> + mips_fbsd_lp64_fetch_link_map_offsets));
> +}
> +\f
> +
> +/* Provide a prototype to silence -Wmissing-prototypes. */
> +void _initialize_mips_fbsd_tdep (void);
> +
> +void
> +_initialize_mips_fbsd_tdep (void)
> +{
> + gdbarch_register_osabi (bfd_arch_mips, 0, GDB_OSABI_FREEBSD_ELF,
> + mips_fbsd_init_abi);
> +}
> diff --git a/gdb/mips-fbsd-tdep.h b/gdb/mips-fbsd-tdep.h
> new file mode 100644
> index 0000000000..ed5b729a16
> --- /dev/null
> +++ b/gdb/mips-fbsd-tdep.h
> @@ -0,0 +1,28 @@
> +/* Common target dependent code for GDB on MIPS systems running FreeBSD.
> +
> + Copyright (C) 2016 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/>. */
> +
> +#ifndef MIPS_FBSD_TDEP_H
> +#define MIPS_FBSD_TDEP_H
> +
> +void mips_fbsd_supply_fpregs (struct regcache *, int, const void *, size_t);
> +void mips_fbsd_supply_gregs (struct regcache *, int, const void *, size_t);
> +void mips_fbsd_collect_fpregs (const struct regcache *, int, void *, size_t);
> +void mips_fbsd_collect_gregs (const struct regcache *, int, void *, size_t);
> +
> +#endif /* MIPS_FBSD_TDEP_H */
>