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/* Generic GNU/Linux target using traditional ptrace register access.
Copyright (C) 1988-2018 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 "linux-nat-trad.h"
#include "nat/gdb_ptrace.h"
#include "inf-ptrace.h"
/* Pointer to a function that returns the offset within the user area
where a particular register is stored. */
static CORE_ADDR (*inf_ptrace_register_u_offset)(struct gdbarch *, int, int);
/* Fetch register REGNUM from the inferior. */
static void
inf_ptrace_fetch_register (struct regcache *regcache, int regnum)
{
struct gdbarch *gdbarch = regcache->arch ();
CORE_ADDR addr;
size_t size;
PTRACE_TYPE_RET *buf;
pid_t pid;
int i;
/* This isn't really an address, but ptrace thinks of it as one. */
addr = inf_ptrace_register_u_offset (gdbarch, regnum, 0);
if (addr == (CORE_ADDR)-1
|| gdbarch_cannot_fetch_register (gdbarch, regnum))
{
regcache_raw_supply (regcache, regnum, NULL);
return;
}
pid = get_ptrace_pid (regcache_get_ptid (regcache));
size = register_size (gdbarch, regnum);
gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0);
buf = (PTRACE_TYPE_RET *) alloca (size);
/* Read the register contents from the inferior a chunk at a time. */
for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
{
errno = 0;
buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, 0);
if (errno != 0)
error (_("Couldn't read register %s (#%d): %s."),
gdbarch_register_name (gdbarch, regnum),
regnum, safe_strerror (errno));
addr += sizeof (PTRACE_TYPE_RET);
}
regcache_raw_supply (regcache, regnum, buf);
}
/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
for all registers. */
static void
inf_ptrace_fetch_registers (struct target_ops *ops,
struct regcache *regcache, int regnum)
{
if (regnum == -1)
for (regnum = 0;
regnum < gdbarch_num_regs (regcache->arch ());
regnum++)
inf_ptrace_fetch_register (regcache, regnum);
else
inf_ptrace_fetch_register (regcache, regnum);
}
/* Store register REGNUM into the inferior. */
static void
inf_ptrace_store_register (const struct regcache *regcache, int regnum)
{
struct gdbarch *gdbarch = regcache->arch ();
CORE_ADDR addr;
size_t size;
PTRACE_TYPE_RET *buf;
pid_t pid;
int i;
/* This isn't really an address, but ptrace thinks of it as one. */
addr = inf_ptrace_register_u_offset (gdbarch, regnum, 1);
if (addr == (CORE_ADDR)-1
|| gdbarch_cannot_store_register (gdbarch, regnum))
return;
pid = get_ptrace_pid (regcache_get_ptid (regcache));
size = register_size (gdbarch, regnum);
gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0);
buf = (PTRACE_TYPE_RET *) alloca (size);
/* Write the register contents into the inferior a chunk at a time. */
regcache_raw_collect (regcache, regnum, buf);
for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
{
errno = 0;
ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, buf[i]);
if (errno != 0)
error (_("Couldn't write register %s (#%d): %s."),
gdbarch_register_name (gdbarch, regnum),
regnum, safe_strerror (errno));
addr += sizeof (PTRACE_TYPE_RET);
}
}
/* Store register REGNUM back into the inferior. If REGNUM is -1, do
this for all registers. */
static void
inf_ptrace_store_registers (struct target_ops *ops,
struct regcache *regcache, int regnum)
{
if (regnum == -1)
for (regnum = 0;
regnum < gdbarch_num_regs (regcache->arch ());
regnum++)
inf_ptrace_store_register (regcache, regnum);
else
inf_ptrace_store_register (regcache, regnum);
}
/* Create a "traditional" Linux/ptrace target. REGISTER_U_OFFSET
should be a function returning the offset within the user area
where a particular register is stored. */
struct target_ops *
linux_trad_target (CORE_ADDR (*register_u_offset)(struct gdbarch *, int, int))
{
struct target_ops *t = inf_ptrace_target();
gdb_assert (register_u_offset);
inf_ptrace_register_u_offset = register_u_offset;
t->to_fetch_registers = inf_ptrace_fetch_registers;
t->to_store_registers = inf_ptrace_store_registers;
linux_target_install_ops (t);
return t;
}
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