[3/3] Add native target for FreeBSD/mips.

This supports the o32 and n64 ABIs.

gdb/ChangeLog:

	* Makefile.in (ALLDEPFILES): Add mips-fbsd-nat.c.
	* config/mips/fbsd.mh: New file.
	* configure.host: Add mips*-*-freebsd*.
	* mips-fbsd-nat.c: New file.
---
 gdb/ChangeLog           |   7 +++
 gdb/Makefile.in         |   1 +
 gdb/config/mips/fbsd.mh |   3 ++
 gdb/configure.host      |   1 +
 gdb/mips-fbsd-nat.c     | 141 ++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 153 insertions(+)
 create mode 100644 gdb/config/mips/fbsd.mh
 create mode 100644 gdb/mips-fbsd-nat.c

A few comments, mostly cosmetic in nature.

On 11/23/2016 02:59 PM, John Baldwin wrote:
> This supports the o32 and n64 ABIs.
>
> gdb/ChangeLog:
>
> 	* Makefile.in (ALLDEPFILES): Add mips-fbsd-nat.c.
> 	* config/mips/fbsd.mh: New file.
> 	* configure.host: Add mips*-*-freebsd*.
> 	* mips-fbsd-nat.c: New file.
> ---
>  gdb/ChangeLog           |   7 +++
>  gdb/Makefile.in         |   1 +
>  gdb/config/mips/fbsd.mh |   3 ++
>  gdb/configure.host      |   1 +
>  gdb/mips-fbsd-nat.c     | 141 ++++++++++++++++++++++++++++++++++++++++++++++++
>  5 files changed, 153 insertions(+)
>  create mode 100644 gdb/config/mips/fbsd.mh
>  create mode 100644 gdb/mips-fbsd-nat.c
>

> diff --git a/gdb/mips-fbsd-nat.c b/gdb/mips-fbsd-nat.c
> new file mode 100644
> index 0000000..67ce683
> --- /dev/null
> +++ b/gdb/mips-fbsd-nat.c
> @@ -0,0 +1,141 @@
> +/* Target-dependent code for FreeBSD/mips.

FreeBSD/MIPS native support?

> +
> +   Copyright (C) 2016 Free Software Foundation, Inc.
> +
> +   This software 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.
> +
> +   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 "inferior.h"
> +#include "regcache.h"
> +#include "target.h"
> +
> +#include <sys/types.h>
> +#include <sys/ptrace.h>
> +#include <machine/reg.h>
> +
> +#include "fbsd-nat.h"
> +#include "mips-tdep.h"
> +#include "mips-fbsd-tdep.h"
> +#include "inf-ptrace.h"
> +
> +/* Determine if PT_GETREGS fetches this register.  */
> +
> +static int

With GDB having switched to C++, using bool here sounds more appropriate.

> +getregs_supplies (struct gdbarch *gdbarch, int regnum)

get_regs_supplies?

> +{
> +  return ((regnum) >= MIPS_ZERO_REGNUM
> +	  && (regnum) <= gdbarch_pc_regnum (gdbarch));
> +}
> +
> +/* Fetch register REGNUM from the inferior.  If REGNUM is -1, do this
> +   for all registers.  */
> +
> +static void
> +mipsfbsd_fetch_inferior_registers (struct target_ops *ops,
> +				   struct regcache *regcache, int regnum)

Same as patch 2/3, mips_fbsd_* sounds more appropriate for the name?

> +{
> +  struct gdbarch *gdbarch = get_regcache_arch (regcache);
> +  if (regnum == -1 || getregs_supplies (gdbarch, regnum))
> +    {
> +      struct reg regs;
> +
> +      if (ptrace (PT_GETREGS, get_ptrace_pid (inferior_ptid),
> +		  (PTRACE_TYPE_ARG3) &regs, 0) == -1)
> +	perror_with_name (_("Couldn't get registers"));
> +
> +      mipsfbsd_supply_gregs (regcache, regnum, &regs, sizeof (register_t));
> +      if (regnum != -1)
> +	return;
> +    }
> +
> +  if (regnum == -1
> +      || regnum >= gdbarch_fp0_regnum (get_regcache_arch (regcache)))
> +    {
> +      struct fpreg fpregs;
> +
> +      if (ptrace (PT_GETFPREGS, get_ptrace_pid (inferior_ptid),
> +		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
> +	perror_with_name (_("Couldn't get floating point status"));

"Couldn't get floating point registers"?

> +
> +      mipsfbsd_supply_fpregs (regcache, regnum, &fpregs,
> +			      sizeof (f_register_t));
> +    }
> +}
> +
> +/* Store register REGNUM back into the inferior.  If REGNUM is -1, do
> +   this for all registers.  */
> +
> +static void
> +mipsfbsd_store_inferior_registers (struct target_ops *ops,
> +				   struct regcache *regcache, int regnum)
> +{
> +  struct gdbarch *gdbarch = get_regcache_arch (regcache);
> +  if (regnum == -1 || getregs_supplies (gdbarch, regnum))
> +    {
> +      struct reg regs;
> +
> +      if (ptrace (PT_GETREGS, get_ptrace_pid (inferior_ptid),
> +		  (PTRACE_TYPE_ARG3) &regs, 0) == -1)
> +	perror_with_name (_("Couldn't get registers"));
> +
> +      mipsfbsd_collect_gregs (regcache, regnum, (char *) &regs,
> +			      sizeof (register_t));
> +
> +      if (ptrace (PT_SETREGS, get_ptrace_pid (inferior_ptid),
> +		  (PTRACE_TYPE_ARG3) &regs, 0) == -1)
> +	perror_with_name (_("Couldn't write registers"));
> +
> +      if (regnum != -1)
> +	return;
> +    }
> +
> +  if (regnum == -1
> +      || regnum >= gdbarch_fp0_regnum (get_regcache_arch (regcache)))
> +    {
> +      struct fpreg fpregs;
> +
> +      if (ptrace (PT_GETFPREGS, get_ptrace_pid (inferior_ptid),
> +		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
> +	perror_with_name (_("Couldn't get floating point status"));

"Couldn't get floating point registers"?

> +
> +      mipsfbsd_collect_fpregs (regcache, regnum, (char *) &fpregs,
> +			       sizeof (f_register_t));
> +
> +      if (ptrace (PT_SETFPREGS, get_ptrace_pid (inferior_ptid),
> +		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
> +	perror_with_name (_("Couldn't write floating point status"));

"Couldn't get floating point registers"?

> +    }
> +}
> +
> +

Spurious newline above.

> +/* Provide a prototype to silence -Wmissing-prototypes.  */
> +void _initialize_mipsfbsd_nat (void);
> +
> +void
> +_initialize_mipsfbsd_nat (void)
> +{
> +  struct target_ops *t;
> +
> +  t = inf_ptrace_target ();
> +  t->to_fetch_registers = mipsfbsd_fetch_inferior_registers;
> +  t->to_store_registers = mipsfbsd_store_inferior_registers;
> +  fbsd_nat_add_target (t);
> +}
> -- 2.9.2
>

Otherwise looks good to me.

Thanks,
Luis

On Friday, November 25, 2016 10:25:53 PM Luis Machado wrote:
> On 11/23/2016 02:59 PM, John Baldwin wrote:
> > @@ -0,0 +1,141 @@
> > +/* Target-dependent code for FreeBSD/mips.
> 
> FreeBSD/MIPS native support?

Whoops, 'Native-dependent' seems to be what many other native targets use,
so I'll go with that.

> > +/* Determine if PT_GETREGS fetches this register.  */
> > +
> > +static int
> 
> With GDB having switched to C++, using bool here sounds more appropriate.

Ok.  This was actually borrowed from mips-nbsd-tdep.c, but I can use bool
here.

> > +getregs_supplies (struct gdbarch *gdbarch, int regnum)
> 
> get_regs_supplies?

(Also copied as above).  The ptrace operation to which this refers is
PT_GETREGS rather than PT_GET_REGS, so I think 'getregs' here is better.

> > +  if (regnum == -1
> > +      || regnum >= gdbarch_fp0_regnum (get_regcache_arch (regcache)))
> > +    {
> > +      struct fpreg fpregs;
> > +
> > +      if (ptrace (PT_GETFPREGS, get_ptrace_pid (inferior_ptid),
> > +		  (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
> > +	perror_with_name (_("Couldn't get floating point status"));
> 
> "Couldn't get floating point registers"?

Most targets use "status" rather than "registers" (including Linux/i386 and
Linux/x86-64).  (Curiously, sparc-nat.c uses both "status" and "registers".)

> > +    }
> > +}
> > +
> > +
> 
> Spurious newline above.

There's actually a form feed (^L) in there as in many other targets before
the _initialize_foo() routine.  mips-linux-*.c don't include one, but many
other targets do.  This may be a no-longer-followed rule though (it is still
in the GNU coding standards at the end of 5.1)?