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- /* Generic GNU/Linux target using traditional ptrace register access.
- Copyright (C) 1988-2022 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"
- #include "gdbarch.h"
- /* Fetch register REGNUM from the inferior. */
- void
- linux_nat_trad_target::fetch_register (struct regcache *regcache, int regnum)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- CORE_ADDR addr;
- gdb_byte *buf;
- size_t size;
- pid_t pid;
- int i;
- /* This isn't really an address, but ptrace thinks of it as one. */
- addr = register_u_offset (gdbarch, regnum, 0);
- if (addr == (CORE_ADDR)-1
- || gdbarch_cannot_fetch_register (gdbarch, regnum))
- {
- regcache->raw_supply (regnum, NULL);
- return;
- }
- pid = get_ptrace_pid (regcache->ptid ());
- size = register_size (gdbarch, regnum);
- buf = (gdb_byte *) alloca (size);
- /* Read the register contents from the inferior a chunk at a time. */
- for (i = 0; i < size; i += sizeof (PTRACE_TYPE_RET))
- {
- size_t chunk = std::min (sizeof (PTRACE_TYPE_RET), size - i);
- PTRACE_TYPE_RET val;
- errno = 0;
- val = 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));
- store_unsigned_integer (buf + i, chunk, byte_order, val);
- addr += sizeof (PTRACE_TYPE_RET);
- }
- regcache->raw_supply (regnum, buf);
- }
- /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
- for all registers. */
- void
- linux_nat_trad_target::fetch_registers (struct regcache *regcache, int regnum)
- {
- if (regnum == -1)
- for (regnum = 0;
- regnum < gdbarch_num_regs (regcache->arch ());
- regnum++)
- fetch_register (regcache, regnum);
- else
- fetch_register (regcache, regnum);
- }
- /* Store register REGNUM into the inferior. */
- void
- linux_nat_trad_target::store_register (const struct regcache *regcache,
- int regnum)
- {
- struct gdbarch *gdbarch = regcache->arch ();
- enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
- CORE_ADDR addr;
- size_t size;
- gdb_byte *buf;
- pid_t pid;
- int i;
- /* This isn't really an address, but ptrace thinks of it as one. */
- addr = register_u_offset (gdbarch, regnum, 1);
- if (addr == (CORE_ADDR)-1
- || gdbarch_cannot_store_register (gdbarch, regnum))
- return;
- pid = get_ptrace_pid (regcache->ptid ());
- size = register_size (gdbarch, regnum);
- buf = (gdb_byte *) alloca (size);
- /* Write the register contents into the inferior a chunk at a time. */
- regcache->raw_collect (regnum, buf);
- for (i = 0; i < size; i += sizeof (PTRACE_TYPE_RET))
- {
- size_t chunk = std::min (sizeof (PTRACE_TYPE_RET), size - i);
- PTRACE_TYPE_RET val;
- val = extract_unsigned_integer (buf + i, chunk, byte_order);
- errno = 0;
- ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3) (uintptr_t) addr, val);
- 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. */
- void
- linux_nat_trad_target::store_registers (struct regcache *regcache, int regnum)
- {
- if (regnum == -1)
- for (regnum = 0;
- regnum < gdbarch_num_regs (regcache->arch ());
- regnum++)
- store_register (regcache, regnum);
- else
- store_register (regcache, regnum);
- }
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