370 lines
12 KiB
C
370 lines
12 KiB
C
/* Native-dependent code for SPARC.
|
||
|
||
Copyright (C) 2003-2014 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 "inferior.h"
|
||
#include "regcache.h"
|
||
#include "target.h"
|
||
|
||
#include <signal.h>
|
||
#include <sys/ptrace.h>
|
||
#include "gdb_wait.h"
|
||
#ifdef HAVE_MACHINE_REG_H
|
||
#include <machine/reg.h>
|
||
#endif
|
||
|
||
#include "sparc-tdep.h"
|
||
#include "sparc-nat.h"
|
||
#include "inf-ptrace.h"
|
||
|
||
/* With some trickery we can use the code in this file for most (if
|
||
not all) ptrace(2) based SPARC systems, which includes SunOS 4,
|
||
GNU/Linux and the various SPARC BSD's.
|
||
|
||
First, we need a data structure for use with ptrace(2). SunOS has
|
||
`struct regs' and `struct fp_status' in <machine/reg.h>. BSD's
|
||
have `struct reg' and `struct fpreg' in <machine/reg.h>. GNU/Linux
|
||
has the same structures as SunOS 4, but they're in <asm/reg.h>,
|
||
which is a kernel header. As a general rule we avoid including
|
||
GNU/Linux kernel headers. Fortunately GNU/Linux has a `gregset_t'
|
||
and a `fpregset_t' that are equivalent to `struct regs' and `struct
|
||
fp_status' in <sys/ucontext.h>, which is automatically included by
|
||
<signal.h>. Settling on using the `gregset_t' and `fpregset_t'
|
||
typedefs, providing them for the other systems, therefore solves
|
||
the puzzle. */
|
||
|
||
#ifdef HAVE_MACHINE_REG_H
|
||
#ifdef HAVE_STRUCT_REG
|
||
typedef struct reg gregset_t;
|
||
typedef struct fpreg fpregset_t;
|
||
#else
|
||
typedef struct regs gregset_t;
|
||
typedef struct fp_status fpregset_t;
|
||
#endif
|
||
#endif
|
||
|
||
/* Second, we need to remap the BSD ptrace(2) requests to their SunOS
|
||
equivalents. GNU/Linux already follows SunOS here. */
|
||
|
||
#ifndef PTRACE_GETREGS
|
||
#define PTRACE_GETREGS PT_GETREGS
|
||
#endif
|
||
|
||
#ifndef PTRACE_SETREGS
|
||
#define PTRACE_SETREGS PT_SETREGS
|
||
#endif
|
||
|
||
#ifndef PTRACE_GETFPREGS
|
||
#define PTRACE_GETFPREGS PT_GETFPREGS
|
||
#endif
|
||
|
||
#ifndef PTRACE_SETFPREGS
|
||
#define PTRACE_SETFPREGS PT_SETFPREGS
|
||
#endif
|
||
|
||
/* Register set description. */
|
||
const struct sparc_gregmap *sparc_gregmap;
|
||
const struct sparc_fpregmap *sparc_fpregmap;
|
||
void (*sparc_supply_gregset) (const struct sparc_gregmap *,
|
||
struct regcache *, int , const void *);
|
||
void (*sparc_collect_gregset) (const struct sparc_gregmap *,
|
||
const struct regcache *, int, void *);
|
||
void (*sparc_supply_fpregset) (const struct sparc_fpregmap *,
|
||
struct regcache *, int , const void *);
|
||
void (*sparc_collect_fpregset) (const struct sparc_fpregmap *,
|
||
const struct regcache *, int , void *);
|
||
int (*sparc_gregset_supplies_p) (struct gdbarch *, int);
|
||
int (*sparc_fpregset_supplies_p) (struct gdbarch *, int);
|
||
|
||
/* Determine whether `gregset_t' contains register REGNUM. */
|
||
|
||
int
|
||
sparc32_gregset_supplies_p (struct gdbarch *gdbarch, int regnum)
|
||
{
|
||
/* Integer registers. */
|
||
if ((regnum >= SPARC_G1_REGNUM && regnum <= SPARC_G7_REGNUM)
|
||
|| (regnum >= SPARC_O0_REGNUM && regnum <= SPARC_O7_REGNUM)
|
||
|| (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_L7_REGNUM)
|
||
|| (regnum >= SPARC_I0_REGNUM && regnum <= SPARC_I7_REGNUM))
|
||
return 1;
|
||
|
||
/* Control registers. */
|
||
if (regnum == SPARC32_PC_REGNUM
|
||
|| regnum == SPARC32_NPC_REGNUM
|
||
|| regnum == SPARC32_PSR_REGNUM
|
||
|| regnum == SPARC32_Y_REGNUM)
|
||
return 1;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Determine whether `fpregset_t' contains register REGNUM. */
|
||
|
||
int
|
||
sparc32_fpregset_supplies_p (struct gdbarch *gdbarch, int regnum)
|
||
{
|
||
/* Floating-point registers. */
|
||
if (regnum >= SPARC_F0_REGNUM && regnum <= SPARC_F31_REGNUM)
|
||
return 1;
|
||
|
||
/* Control registers. */
|
||
if (regnum == SPARC32_FSR_REGNUM)
|
||
return 1;
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
|
||
for all registers (including the floating-point registers). */
|
||
|
||
void
|
||
sparc_fetch_inferior_registers (struct target_ops *ops,
|
||
struct regcache *regcache, int regnum)
|
||
{
|
||
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
||
int pid;
|
||
|
||
/* NOTE: cagney/2002-12-03: This code assumes that the currently
|
||
selected light weight processes' registers can be written
|
||
directly into the selected thread's register cache. This works
|
||
fine when given an 1:1 LWP:thread model (such as found on
|
||
GNU/Linux) but will, likely, have problems when used on an N:1
|
||
(userland threads) or N:M (userland multiple LWP) model. In the
|
||
case of the latter two, the LWP's registers do not necessarily
|
||
belong to the selected thread (the LWP could be in the middle of
|
||
executing the thread switch code).
|
||
|
||
These functions should instead be paramaterized with an explicit
|
||
object (struct regcache, struct thread_info?) into which the LWPs
|
||
registers can be written. */
|
||
pid = ptid_get_lwp (inferior_ptid);
|
||
if (pid == 0)
|
||
pid = ptid_get_pid (inferior_ptid);
|
||
|
||
if (regnum == SPARC_G0_REGNUM)
|
||
{
|
||
gdb_byte zero[8] = { 0 };
|
||
|
||
regcache_raw_supply (regcache, SPARC_G0_REGNUM, &zero);
|
||
return;
|
||
}
|
||
|
||
if (regnum == -1 || sparc_gregset_supplies_p (gdbarch, regnum))
|
||
{
|
||
gregset_t regs;
|
||
|
||
if (ptrace (PTRACE_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
|
||
perror_with_name (_("Couldn't get registers"));
|
||
|
||
sparc_supply_gregset (sparc_gregmap, regcache, -1, ®s);
|
||
if (regnum != -1)
|
||
return;
|
||
}
|
||
|
||
if (regnum == -1 || sparc_fpregset_supplies_p (gdbarch, regnum))
|
||
{
|
||
fpregset_t fpregs;
|
||
|
||
if (ptrace (PTRACE_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
|
||
perror_with_name (_("Couldn't get floating point status"));
|
||
|
||
sparc_supply_fpregset (sparc_fpregmap, regcache, -1, &fpregs);
|
||
}
|
||
}
|
||
|
||
void
|
||
sparc_store_inferior_registers (struct target_ops *ops,
|
||
struct regcache *regcache, int regnum)
|
||
{
|
||
struct gdbarch *gdbarch = get_regcache_arch (regcache);
|
||
int pid;
|
||
|
||
/* NOTE: cagney/2002-12-02: See comment in fetch_inferior_registers
|
||
about threaded assumptions. */
|
||
pid = ptid_get_lwp (inferior_ptid);
|
||
if (pid == 0)
|
||
pid = ptid_get_pid (inferior_ptid);
|
||
|
||
if (regnum == -1 || sparc_gregset_supplies_p (gdbarch, regnum))
|
||
{
|
||
gregset_t regs;
|
||
|
||
if (ptrace (PTRACE_GETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
|
||
perror_with_name (_("Couldn't get registers"));
|
||
|
||
sparc_collect_gregset (sparc_gregmap, regcache, regnum, ®s);
|
||
|
||
if (ptrace (PTRACE_SETREGS, pid, (PTRACE_TYPE_ARG3) ®s, 0) == -1)
|
||
perror_with_name (_("Couldn't write registers"));
|
||
|
||
/* Deal with the stack regs. */
|
||
if (regnum == -1 || regnum == SPARC_SP_REGNUM
|
||
|| (regnum >= SPARC_L0_REGNUM && regnum <= SPARC_I7_REGNUM))
|
||
{
|
||
ULONGEST sp;
|
||
|
||
regcache_cooked_read_unsigned (regcache, SPARC_SP_REGNUM, &sp);
|
||
sparc_collect_rwindow (regcache, sp, regnum);
|
||
}
|
||
|
||
if (regnum != -1)
|
||
return;
|
||
}
|
||
|
||
if (regnum == -1 || sparc_fpregset_supplies_p (gdbarch, regnum))
|
||
{
|
||
fpregset_t fpregs, saved_fpregs;
|
||
|
||
if (ptrace (PTRACE_GETFPREGS, pid, (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
|
||
perror_with_name (_("Couldn't get floating-point registers"));
|
||
|
||
memcpy (&saved_fpregs, &fpregs, sizeof (fpregs));
|
||
sparc_collect_fpregset (sparc_fpregmap, regcache, regnum, &fpregs);
|
||
|
||
/* Writing the floating-point registers will fail on NetBSD with
|
||
EINVAL if the inferior process doesn't have an FPU state
|
||
(i.e. if it didn't use the FPU yet). Therefore we don't try
|
||
to write the registers if nothing changed. */
|
||
if (memcmp (&saved_fpregs, &fpregs, sizeof (fpregs)) != 0)
|
||
{
|
||
if (ptrace (PTRACE_SETFPREGS, pid,
|
||
(PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
|
||
perror_with_name (_("Couldn't write floating-point registers"));
|
||
}
|
||
|
||
if (regnum != -1)
|
||
return;
|
||
}
|
||
}
|
||
|
||
|
||
/* Implement the to_xfer_partial target_ops method for
|
||
TARGET_OBJECT_WCOOKIE. Fetch StackGhost Per-Process XOR cookie. */
|
||
|
||
static enum target_xfer_status
|
||
sparc_xfer_wcookie (struct target_ops *ops, enum target_object object,
|
||
const char *annex, gdb_byte *readbuf,
|
||
const gdb_byte *writebuf, ULONGEST offset, ULONGEST len,
|
||
ULONGEST *xfered_len)
|
||
{
|
||
unsigned long wcookie = 0;
|
||
char *buf = (char *)&wcookie;
|
||
|
||
gdb_assert (object == TARGET_OBJECT_WCOOKIE);
|
||
gdb_assert (readbuf && writebuf == NULL);
|
||
|
||
if (offset == sizeof (unsigned long))
|
||
return TARGET_XFER_EOF; /* Signal EOF. */
|
||
if (offset > sizeof (unsigned long))
|
||
return TARGET_XFER_E_IO;
|
||
|
||
#ifdef PT_WCOOKIE
|
||
/* If PT_WCOOKIE is defined (by <sys/ptrace.h>), assume we're
|
||
running on an OpenBSD release that uses StackGhost (3.1 or
|
||
later). Since release 3.6, OpenBSD uses a fully randomized
|
||
cookie. */
|
||
{
|
||
int pid = ptid_get_pid (inferior_ptid);
|
||
|
||
/* Sanity check. The proper type for a cookie is register_t, but
|
||
we can't assume that this type exists on all systems supported
|
||
by the code in this file. */
|
||
gdb_assert (sizeof (wcookie) == sizeof (register_t));
|
||
|
||
/* Fetch the cookie. */
|
||
if (ptrace (PT_WCOOKIE, pid, (PTRACE_TYPE_ARG3) &wcookie, 0) == -1)
|
||
{
|
||
if (errno != EINVAL)
|
||
perror_with_name (_("Couldn't get StackGhost cookie"));
|
||
|
||
/* Although PT_WCOOKIE is defined on OpenBSD 3.1 and later,
|
||
the request wasn't implemented until after OpenBSD 3.4. If
|
||
the kernel doesn't support the PT_WCOOKIE request, assume
|
||
we're running on a kernel that uses non-randomized cookies. */
|
||
wcookie = 0x3;
|
||
}
|
||
}
|
||
#endif /* PT_WCOOKIE */
|
||
|
||
if (len > sizeof (unsigned long) - offset)
|
||
len = sizeof (unsigned long) - offset;
|
||
|
||
memcpy (readbuf, buf + offset, len);
|
||
*xfered_len = (ULONGEST) len;
|
||
return TARGET_XFER_OK;
|
||
}
|
||
|
||
target_xfer_partial_ftype *inf_ptrace_xfer_partial;
|
||
|
||
static enum target_xfer_status
|
||
sparc_xfer_partial (struct target_ops *ops, enum target_object object,
|
||
const char *annex, gdb_byte *readbuf,
|
||
const gdb_byte *writebuf, ULONGEST offset, ULONGEST len,
|
||
ULONGEST *xfered_len)
|
||
{
|
||
if (object == TARGET_OBJECT_WCOOKIE)
|
||
return sparc_xfer_wcookie (ops, object, annex, readbuf, writebuf,
|
||
offset, len, xfered_len);
|
||
|
||
return inf_ptrace_xfer_partial (ops, object, annex, readbuf, writebuf,
|
||
offset, len, xfered_len);
|
||
}
|
||
|
||
/* Create a prototype generic SPARC target. The client can override
|
||
it with local methods. */
|
||
|
||
struct target_ops *
|
||
sparc_target (void)
|
||
{
|
||
struct target_ops *t;
|
||
|
||
t = inf_ptrace_target ();
|
||
t->to_fetch_registers = sparc_fetch_inferior_registers;
|
||
t->to_store_registers = sparc_store_inferior_registers;
|
||
inf_ptrace_xfer_partial = t->to_xfer_partial;
|
||
t->to_xfer_partial = sparc_xfer_partial;
|
||
return t;
|
||
}
|
||
|
||
|
||
/* Provide a prototype to silence -Wmissing-prototypes. */
|
||
void _initialize_sparc_nat (void);
|
||
|
||
void
|
||
_initialize_sparc_nat (void)
|
||
{
|
||
/* Deafult to using SunOS 4 register sets. */
|
||
if (sparc_gregmap == NULL)
|
||
sparc_gregmap = &sparc32_sunos4_gregmap;
|
||
if (sparc_fpregmap == NULL)
|
||
sparc_fpregmap = &sparc32_sunos4_fpregmap;
|
||
if (sparc_supply_gregset == NULL)
|
||
sparc_supply_gregset = sparc32_supply_gregset;
|
||
if (sparc_collect_gregset == NULL)
|
||
sparc_collect_gregset = sparc32_collect_gregset;
|
||
if (sparc_supply_fpregset == NULL)
|
||
sparc_supply_fpregset = sparc32_supply_fpregset;
|
||
if (sparc_collect_fpregset == NULL)
|
||
sparc_collect_fpregset = sparc32_collect_fpregset;
|
||
if (sparc_gregset_supplies_p == NULL)
|
||
sparc_gregset_supplies_p = sparc32_gregset_supplies_p;
|
||
if (sparc_fpregset_supplies_p == NULL)
|
||
sparc_fpregset_supplies_p = sparc32_fpregset_supplies_p;
|
||
}
|