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

Luis Machado lgustavo@codesourcery.com
Tue Jan 3 19:05:00 GMT 2017


I went through the patch and i have no further comments.

Out of curiosity, have you tested this? If so, did you get reasonable 
numbers with GDB's testsuite?

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));
> +}
> +

> +
> +/* 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 */
>



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