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/* Native-dependent code for PA-RISC HP-UX.
Copyright (C) 2004, 2005, 2007 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 "gdb_assert.h"
#include <sys/ptrace.h>
#include <machine/save_state.h>
#ifdef HAVE_TTRACE
#include <sys/ttrace.h>
#endif
#include "hppa-tdep.h"
#include "inf-ptrace.h"
#include "inf-ttrace.h"
/* Non-zero if we should pretend not to be a runnable target. */
int child_suppress_run = 0;
/* Return the offset of register REGNUM within `struct save_state'.
The offset returns depends on the flags in the "flags" register and
the register size (32-bit or 64-bit). These are taken from
REGCACHE. */
LONGEST
hppa_hpux_save_state_offset (struct regcache *regcache, int regnum)
{
LONGEST offset;
if (regnum == HPPA_FLAGS_REGNUM)
return ssoff (ss_flags);
if (HPPA_R0_REGNUM < regnum && regnum < HPPA_FP0_REGNUM)
{
struct gdbarch *arch = get_regcache_arch (regcache);
size_t size = register_size (arch, HPPA_R1_REGNUM);
ULONGEST flags;
gdb_assert (size == 4 || size == 8);
regcache_cooked_read_unsigned (regcache, HPPA_FLAGS_REGNUM, &flags);
if (flags & SS_WIDEREGS)
offset = ssoff (ss_wide) + (8 - size) + (regnum - HPPA_R0_REGNUM) * 8;
else
offset = ssoff (ss_narrow) + (regnum - HPPA_R1_REGNUM) * 4;
}
else
{
struct gdbarch *arch = get_regcache_arch (regcache);
size_t size = register_size (arch, HPPA_FP0_REGNUM);
gdb_assert (size == 4 || size == 8);
gdb_assert (regnum >= HPPA_FP0_REGNUM);
offset = ssoff(ss_fpblock) + (regnum - HPPA_FP0_REGNUM) * size;
}
gdb_assert (offset < sizeof (save_state_t));
return offset;
}
/* Just in case a future version of PA-RISC HP-UX won't have ptrace(2)
at all. */
#ifndef PTRACE_TYPE_RET
#define PTRACE_TYPE_RET void
#endif
static void
hppa_hpux_fetch_register (struct regcache *regcache, int regnum)
{
CORE_ADDR addr;
size_t size;
PTRACE_TYPE_RET *buf;
pid_t pid;
int i;
pid = ptid_get_pid (inferior_ptid);
/* This isn't really an address, but ptrace thinks of it as one. */
addr = hppa_hpux_save_state_offset (regcache, regnum);
size = register_size (current_gdbarch, regnum);
gdb_assert (size == 4 || size == 8);
buf = alloca (size);
#ifdef HAVE_TTRACE
{
lwpid_t lwp = ptid_get_lwp (inferior_ptid);
if (ttrace (TT_LWP_RUREGS, pid, lwp, addr, size, (uintptr_t)buf) == -1)
error (_("Couldn't read register %s (#%d): %s"),
gdbarch_register_name (current_gdbarch, regnum),
regnum, safe_strerror (errno));
}
#else
{
int i;
/* Read the register contents from the inferior a chuck at the time. */
for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
{
errno = 0;
buf[i] = ptrace (PT_RUREGS, pid, (PTRACE_TYPE_ARG3) addr, 0, 0);
if (errno != 0)
error (_("Couldn't read register %s (#%d): %s"),
gdbarch_register_name (current_gdbarch, regnum),
regnum, safe_strerror (errno));
addr += sizeof (PTRACE_TYPE_RET);
}
}
#endif
/* Take care with the "flags" register. It's stored as an `int' in
`struct save_state', even for 64-bit code. */
if (regnum == HPPA_FLAGS_REGNUM && size == 8)
{
ULONGEST flags = extract_unsigned_integer ((gdb_byte *)buf, 4);
store_unsigned_integer ((gdb_byte *)buf, 8, flags);
}
regcache_raw_supply (regcache, regnum, buf);
}
static void
hppa_hpux_fetch_inferior_registers (struct regcache *regcache, int regnum)
{
if (regnum == -1)
for (regnum = 0; regnum < gdbarch_num_regs (current_gdbarch); regnum++)
hppa_hpux_fetch_register (regcache, regnum);
else
hppa_hpux_fetch_register (regcache, regnum);
}
/* Store register REGNUM into the inferior. */
static void
hppa_hpux_store_register (struct regcache *regcache, int regnum)
{
CORE_ADDR addr;
size_t size;
PTRACE_TYPE_RET *buf;
pid_t pid;
pid = ptid_get_pid (inferior_ptid);
/* This isn't really an address, but ptrace thinks of it as one. */
addr = hppa_hpux_save_state_offset (regcache, regnum);
size = register_size (current_gdbarch, regnum);
gdb_assert (size == 4 || size == 8);
buf = alloca (size);
regcache_raw_collect (regcache, regnum, buf);
/* Take care with the "flags" register. It's stored as an `int' in
`struct save_state', even for 64-bit code. */
if (regnum == HPPA_FLAGS_REGNUM && size == 8)
{
ULONGEST flags = extract_unsigned_integer ((gdb_byte *)buf, 8);
store_unsigned_integer ((gdb_byte *)buf, 4, flags);
size = 4;
}
#ifdef HAVE_TTRACE
{
lwpid_t lwp = ptid_get_lwp (inferior_ptid);
if (ttrace (TT_LWP_WUREGS, pid, lwp, addr, size, (uintptr_t)buf) == -1)
error (_("Couldn't write register %s (#%d): %s"),
gdbarch_register_name (current_gdbarch, regnum),
regnum, safe_strerror (errno));
}
#else
{
int i;
/* Write the register contents into the inferior a chunk at the time. */
for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
{
errno = 0;
ptrace (PT_WUREGS, pid, (PTRACE_TYPE_ARG3) addr, buf[i], 0);
if (errno != 0)
error (_("Couldn't write register %s (#%d): %s"),
gdbarch_register_name (current_gdbarch, regnum),
regnum, safe_strerror (errno));
addr += sizeof (PTRACE_TYPE_RET);
}
}
#endif
}
/* Store register REGNUM back into the inferior. If REGNUM is -1, do
this for all registers (including the floating point registers). */
static void
hppa_hpux_store_inferior_registers (struct regcache *regcache, int regnum)
{
if (regnum == -1)
for (regnum = 0; regnum < gdbarch_num_regs (current_gdbarch); regnum++)
hppa_hpux_store_register (regcache, regnum);
else
hppa_hpux_store_register (regcache, regnum);
}
static int
hppa_hpux_child_can_run (void)
{
/* This variable is controlled by modules that layer their own
process structure atop that provided here. The code in
hpux-thread.c does this to support the HP-UX user-mode DCE
threads. */
return !child_suppress_run;
}
/* Prevent warning from -Wmissing-prototypes. */
void _initialize_hppa_hpux_nat (void);
void
_initialize_hppa_hpux_nat (void)
{
struct target_ops *t;
#ifdef HAVE_TTRACE
t = inf_ttrace_target ();
#else
t = inf_ptrace_target ();
#endif
t->to_fetch_registers = hppa_hpux_fetch_inferior_registers;
t->to_store_registers = hppa_hpux_store_inferior_registers;
t->to_can_run = hppa_hpux_child_can_run;
add_target (t);
}
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