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

John Baldwin
2017-01-03T20:12:30Z

On Tuesday, January 03, 2017 01:05:35 PM Luis Machado wrote:
> 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?

I have not run it through the testsuite, no. The time I have spent on
running the testsuite so far has been focused on FreeBSD/x86 which needs
a fair bit of work.

> 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 */
> >
>

--
John Baldwin