270 lines
7.4 KiB
C
270 lines
7.4 KiB
C
/* Native-dependent code for PA-RISC HP-UX.
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Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010
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Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "inferior.h"
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#include "regcache.h"
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#include "target.h"
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#include "gdb_assert.h"
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#include <sys/ptrace.h>
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#include <machine/save_state.h>
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#ifdef HAVE_TTRACE
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#include <sys/ttrace.h>
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#endif
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#include "hppa-tdep.h"
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#include "inf-ptrace.h"
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#include "inf-ttrace.h"
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/* Non-zero if we should pretend not to be a runnable target. */
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int child_suppress_run = 0;
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/* Return the offset of register REGNUM within `struct save_state'.
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The offset returns depends on the flags in the "flags" register and
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the register size (32-bit or 64-bit). These are taken from
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REGCACHE. */
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LONGEST
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hppa_hpux_save_state_offset (struct regcache *regcache, int regnum)
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{
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LONGEST offset;
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if (regnum == HPPA_FLAGS_REGNUM)
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return ssoff (ss_flags);
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if (HPPA_R0_REGNUM < regnum && regnum < HPPA_FP0_REGNUM)
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{
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struct gdbarch *arch = get_regcache_arch (regcache);
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size_t size = register_size (arch, HPPA_R1_REGNUM);
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ULONGEST flags;
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gdb_assert (size == 4 || size == 8);
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regcache_cooked_read_unsigned (regcache, HPPA_FLAGS_REGNUM, &flags);
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if (flags & SS_WIDEREGS)
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offset = ssoff (ss_wide) + (8 - size) + (regnum - HPPA_R0_REGNUM) * 8;
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else
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offset = ssoff (ss_narrow) + (regnum - HPPA_R1_REGNUM) * 4;
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}
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else
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{
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struct gdbarch *arch = get_regcache_arch (regcache);
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size_t size = register_size (arch, HPPA_FP0_REGNUM);
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gdb_assert (size == 4 || size == 8);
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gdb_assert (regnum >= HPPA_FP0_REGNUM);
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offset = ssoff(ss_fpblock) + (regnum - HPPA_FP0_REGNUM) * size;
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}
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gdb_assert (offset < sizeof (save_state_t));
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return offset;
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}
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/* Just in case a future version of PA-RISC HP-UX won't have ptrace(2)
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at all. */
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#ifndef PTRACE_TYPE_RET
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#define PTRACE_TYPE_RET void
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#endif
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static void
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hppa_hpux_fetch_register (struct regcache *regcache, int regnum)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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CORE_ADDR addr;
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size_t size;
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PTRACE_TYPE_RET *buf;
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pid_t pid;
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int i;
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pid = ptid_get_pid (inferior_ptid);
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/* This isn't really an address, but ptrace thinks of it as one. */
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addr = hppa_hpux_save_state_offset (regcache, regnum);
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size = register_size (gdbarch, regnum);
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gdb_assert (size == 4 || size == 8);
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buf = alloca (size);
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#ifdef HAVE_TTRACE
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{
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lwpid_t lwp = ptid_get_lwp (inferior_ptid);
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if (ttrace (TT_LWP_RUREGS, pid, lwp, addr, size, (uintptr_t)buf) == -1)
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error (_("Couldn't read register %s (#%d): %s"),
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gdbarch_register_name (gdbarch, regnum),
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regnum, safe_strerror (errno));
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}
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#else
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{
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int i;
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/* Read the register contents from the inferior a chuck at the time. */
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for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
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{
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errno = 0;
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buf[i] = ptrace (PT_RUREGS, pid, (PTRACE_TYPE_ARG3) addr, 0, 0);
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if (errno != 0)
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error (_("Couldn't read register %s (#%d): %s"),
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gdbarch_register_name (gdbarch, regnum),
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regnum, safe_strerror (errno));
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addr += sizeof (PTRACE_TYPE_RET);
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}
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}
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#endif
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/* Take care with the "flags" register. It's stored as an `int' in
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`struct save_state', even for 64-bit code. */
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if (regnum == HPPA_FLAGS_REGNUM && size == 8)
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{
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ULONGEST flags;
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flags = extract_unsigned_integer ((gdb_byte *)buf, 4, byte_order);
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store_unsigned_integer ((gdb_byte *)buf, 8, byte_order, flags);
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}
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regcache_raw_supply (regcache, regnum, buf);
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}
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static void
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hppa_hpux_fetch_inferior_registers (struct target_ops *ops,
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struct regcache *regcache, int regnum)
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{
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if (regnum == -1)
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for (regnum = 0;
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regnum < gdbarch_num_regs (get_regcache_arch (regcache));
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regnum++)
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hppa_hpux_fetch_register (regcache, regnum);
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else
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hppa_hpux_fetch_register (regcache, regnum);
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}
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/* Store register REGNUM into the inferior. */
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static void
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hppa_hpux_store_register (struct regcache *regcache, int regnum)
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{
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struct gdbarch *gdbarch = get_regcache_arch (regcache);
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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CORE_ADDR addr;
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size_t size;
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PTRACE_TYPE_RET *buf;
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pid_t pid;
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pid = ptid_get_pid (inferior_ptid);
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/* This isn't really an address, but ptrace thinks of it as one. */
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addr = hppa_hpux_save_state_offset (regcache, regnum);
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size = register_size (gdbarch, regnum);
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gdb_assert (size == 4 || size == 8);
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buf = alloca (size);
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regcache_raw_collect (regcache, regnum, buf);
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/* Take care with the "flags" register. It's stored as an `int' in
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`struct save_state', even for 64-bit code. */
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if (regnum == HPPA_FLAGS_REGNUM && size == 8)
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{
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ULONGEST flags;
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flags = extract_unsigned_integer ((gdb_byte *)buf, 8, byte_order);
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store_unsigned_integer ((gdb_byte *)buf, 4, byte_order, flags);
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size = 4;
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}
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#ifdef HAVE_TTRACE
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{
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lwpid_t lwp = ptid_get_lwp (inferior_ptid);
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if (ttrace (TT_LWP_WUREGS, pid, lwp, addr, size, (uintptr_t)buf) == -1)
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error (_("Couldn't write register %s (#%d): %s"),
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gdbarch_register_name (gdbarch, regnum),
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regnum, safe_strerror (errno));
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}
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#else
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{
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int i;
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/* Write the register contents into the inferior a chunk at the time. */
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for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
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{
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errno = 0;
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ptrace (PT_WUREGS, pid, (PTRACE_TYPE_ARG3) addr, buf[i], 0);
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if (errno != 0)
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error (_("Couldn't write register %s (#%d): %s"),
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gdbarch_register_name (gdbarch, regnum),
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regnum, safe_strerror (errno));
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addr += sizeof (PTRACE_TYPE_RET);
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}
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}
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#endif
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}
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/* Store register REGNUM back into the inferior. If REGNUM is -1, do
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this for all registers (including the floating point registers). */
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static void
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hppa_hpux_store_inferior_registers (struct target_ops *ops,
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struct regcache *regcache, int regnum)
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{
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if (regnum == -1)
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for (regnum = 0;
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regnum < gdbarch_num_regs (get_regcache_arch (regcache));
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regnum++)
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hppa_hpux_store_register (regcache, regnum);
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else
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hppa_hpux_store_register (regcache, regnum);
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}
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static int
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hppa_hpux_child_can_run (void)
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{
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/* This variable is controlled by modules that layer their own
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process structure atop that provided here. The code in
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hpux-thread.c does this to support the HP-UX user-mode DCE
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threads. */
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return !child_suppress_run;
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}
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/* Prevent warning from -Wmissing-prototypes. */
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void _initialize_hppa_hpux_nat (void);
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void
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_initialize_hppa_hpux_nat (void)
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{
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struct target_ops *t;
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#ifdef HAVE_TTRACE
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t = inf_ttrace_target ();
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#else
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t = inf_ptrace_target ();
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#endif
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t->to_fetch_registers = hppa_hpux_fetch_inferior_registers;
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t->to_store_registers = hppa_hpux_store_inferior_registers;
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t->to_can_run = hppa_hpux_child_can_run;
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add_target (t);
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}
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