145 lines
4.2 KiB
C
145 lines
4.2 KiB
C
/* Generic GNU/Linux target using traditional ptrace register access.
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Copyright (C) 1988-2018 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 "linux-nat-trad.h"
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#include "nat/gdb_ptrace.h"
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#include "inf-ptrace.h"
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/* Fetch register REGNUM from the inferior. */
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void
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linux_nat_trad_target::fetch_register (struct regcache *regcache, int regnum)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
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CORE_ADDR addr;
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gdb_byte *buf;
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size_t size;
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pid_t pid;
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int i;
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/* This isn't really an address, but ptrace thinks of it as one. */
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addr = register_u_offset (gdbarch, regnum, 0);
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if (addr == (CORE_ADDR)-1
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|| gdbarch_cannot_fetch_register (gdbarch, regnum))
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{
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regcache->raw_supply (regnum, NULL);
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return;
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}
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pid = get_ptrace_pid (regcache->ptid ());
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size = register_size (gdbarch, regnum);
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buf = (gdb_byte *) alloca (size);
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/* Read the register contents from the inferior a chunk at a time. */
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for (i = 0; i < size; i += sizeof (PTRACE_TYPE_RET))
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{
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size_t chunk = std::min (sizeof (PTRACE_TYPE_RET), size - i);
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PTRACE_TYPE_RET val;
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errno = 0;
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val = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3) (uintptr_t) addr, 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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store_unsigned_integer (buf + i, chunk, byte_order, val);
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addr += sizeof (PTRACE_TYPE_RET);
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}
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regcache->raw_supply (regnum, buf);
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}
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/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
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for all registers. */
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void
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linux_nat_trad_target::fetch_registers (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 (regcache->arch ());
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regnum++)
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fetch_register (regcache, regnum);
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else
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fetch_register (regcache, regnum);
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}
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/* Store register REGNUM into the inferior. */
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void
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linux_nat_trad_target::store_register (const struct regcache *regcache,
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int regnum)
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{
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struct gdbarch *gdbarch = regcache->arch ();
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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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gdb_byte *buf;
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pid_t pid;
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int i;
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/* This isn't really an address, but ptrace thinks of it as one. */
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addr = register_u_offset (gdbarch, regnum, 1);
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if (addr == (CORE_ADDR)-1
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|| gdbarch_cannot_store_register (gdbarch, regnum))
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return;
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pid = get_ptrace_pid (regcache->ptid ());
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size = register_size (gdbarch, regnum);
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buf = (gdb_byte *) alloca (size);
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/* Write the register contents into the inferior a chunk at a time. */
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regcache->raw_collect (regnum, buf);
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for (i = 0; i < size; i += sizeof (PTRACE_TYPE_RET))
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{
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size_t chunk = std::min (sizeof (PTRACE_TYPE_RET), size - i);
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PTRACE_TYPE_RET val;
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val = extract_unsigned_integer (buf + i, chunk, byte_order);
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errno = 0;
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ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3) (uintptr_t) addr, val);
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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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/* Store register REGNUM back into the inferior. If REGNUM is -1, do
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this for all registers. */
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void
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linux_nat_trad_target::store_registers (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 (regcache->arch ());
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regnum++)
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store_register (regcache, regnum);
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else
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store_register (regcache, regnum);
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}
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