/* Generic GNU/Linux target using traditional ptrace register access.
- Copyright (C) 1988-2018 Free Software Foundation, Inc.
+ Copyright (C) 1988-2019 Free Software Foundation, Inc.
This file is part of GDB.
#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);
+#include "gdbarch.h"
/* Fetch register REGNUM from the inferior. */
-static void
-inf_ptrace_fetch_register (struct regcache *regcache, int regnum)
+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;
- 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);
+ addr = register_u_offset (gdbarch, regnum, 0);
if (addr == (CORE_ADDR)-1
|| gdbarch_cannot_fetch_register (gdbarch, regnum))
{
- regcache_raw_supply (regcache, regnum, NULL);
+ regcache->raw_supply (regnum, NULL);
return;
}
- pid = get_ptrace_pid (regcache_get_ptid (regcache));
+ pid = get_ptrace_pid (regcache->ptid ());
size = register_size (gdbarch, regnum);
- gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0);
- buf = (PTRACE_TYPE_RET *) alloca (size);
+ buf = (gdb_byte *) alloca (size);
/* Read the register contents from the inferior a chunk at a time. */
- for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
+ 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;
- buf[i] = ptrace (PT_READ_U, pid, (PTRACE_TYPE_ARG3)(uintptr_t)addr, 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 (regcache, regnum, buf);
+ regcache->raw_supply (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)
+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++)
- inf_ptrace_fetch_register (regcache, regnum);
+ fetch_register (regcache, regnum);
else
- inf_ptrace_fetch_register (regcache, regnum);
+ fetch_register (regcache, regnum);
}
/* Store register REGNUM into the inferior. */
-static void
-inf_ptrace_store_register (const struct regcache *regcache, int regnum)
+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;
- PTRACE_TYPE_RET *buf;
+ gdb_byte *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);
+ addr = 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));
+ pid = get_ptrace_pid (regcache->ptid ());
size = register_size (gdbarch, regnum);
- gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0);
- buf = (PTRACE_TYPE_RET *) alloca (size);
+ buf = (gdb_byte *) 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++)
+ 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, buf[i]);
+ 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),
/* 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)
+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++)
- inf_ptrace_store_register (regcache, regnum);
+ 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;
+ store_register (regcache, regnum);
}
projects / deliverable / binutils-gdb.git / blobdiff