-/* Low level Unix child interface to ptrace, for GDB when running under Unix.
+/* Low-level child interface to ptrace.
Copyright 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
- 1998, 1999, 2000, 2001, 2002, 2004 Free Software Foundation, Inc.
+ 1998, 1999, 2000, 2001, 2002, 2004, 2005
+ Free Software Foundation, Inc.
This file is part of GDB.
Boston, MA 02111-1307, USA. */
#include "defs.h"
-#include "observer.h"
-#include "gdb_ptrace.h"
-#include "inflow.h"
-#include "inferior.h"
-#include "regcache.h"
#include "command.h"
+#include "inferior.h"
+#include "inflow.h"
#include "gdbcore.h"
-#include "inf-child.h"
-#include "gdbcmd.h"
-#include "gdb_string.h"
+#include "observer.h"
+#include "regcache.h"
+#include "gdb_assert.h"
+#include "gdb_string.h"
+#include "gdb_ptrace.h"
#include "gdb_wait.h"
#include <signal.h>
-/* HACK: Save the ptrace ops returned by ptrace_target. */
+#include "inf-child.h"
+
+/* HACK: Save the ptrace ops returned by inf_ptrace_target. */
static struct target_ops *ptrace_ops_hack;
static void
/* This once used to call "kill" to kill the inferior just in case
the inferior was still running. As others have noted in the past
(kingdon) there shouldn't be any way to get here if the inferior
- is still running -- else there's a major problem elsewere in gdb
+ is still running -- else there's a major problem elsewere in GDB
and it needs to be fixed.
- The kill call causes problems under hpux10, so it's been removed;
- if this causes problems we'll deal with them as they arise. */
+ The kill call causes problems under HP-UX 10, so it's been
+ removed; if this causes problems we'll deal with them as they
+ arise. */
ptrace (PT_KILL, pid, (PTRACE_TYPE_ARG3) 0, 0);
wait (&status);
target_mourn_inferior ();
return pid_to_ptid (-1);
}
- /* Did it exit?
- */
+ /* Did it exit? */
if (target_has_exited (pid, status, &exit_status))
{
/* ??rehrauer: For now, ignore this. */
return pid_to_ptid (pid);
}
}
- while (pid != PIDGET (inferior_ptid)); /* Some other child died or stopped */
+ while (pid != PIDGET (inferior_ptid)); /* Some other child died or
+ stopped. */
store_waitstatus (ourstatus, status);
return pid_to_ptid (pid);
dummy = args;
pid = strtol (args, &dummy, 0);
- /* Some targets don't set errno on errors, grrr! */
+ /* Some targets don't set errno on errors, grrr! */
if (pid == 0 && args == dummy)
error ("Illegal process-id: %s\n", args);
- if (pid == getpid ()) /* Trying to masturbate? */
+ if (pid == getpid ()) /* Trying to masturbate? */
error ("I refuse to debug myself!");
if (from_tty)
inferior_ptid = pid_to_ptid (pid);
push_target (ptrace_ops_hack);
+
+ /* Do this first, before anything has had a chance to query the
+ inferior's symbol table or similar. */
+ observer_notify_inferior_created (¤t_target, from_tty);
}
static void
unpush_target (ptrace_ops_hack);
}
-/* Get ready to modify the registers array. On machines which store
- individual registers, this doesn't need to do anything. On
- machines which store all the registers in one fell swoop, this
- makes sure that registers contains all the registers from the
- program being debugged. */
-
-static void
-inf_ptrace_prepare_to_store (void)
-{
-}
-
/* Print status information about what we're accessing. */
static void
static void
inf_ptrace_me (void)
{
- /* "Trace me, Dr. Memory!" */
+ /* "Trace me, Dr. Memory!" */
ptrace (0, 0, (PTRACE_TYPE_ARG3) 0, 0);
}
/* On some targets, there must be some explicit synchronization
between the parent and child processes after the debugger
forks, and before the child execs the debuggee program. This
- call basically gives permission for the child to exec.
- */
+ call basically gives permission for the child to exec. */
target_acknowledge_created_inferior (pid);
- /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h,
- * and will be 1 or 2 depending on whether we're starting
- * without or with a shell.
- */
+ /* START_INFERIOR_TRAPS_EXPECTED is defined in inferior.h, and will
+ be 1 or 2 depending on whether we're starting without or with a
+ shell. */
startup_inferior (START_INFERIOR_TRAPS_EXPECTED);
/* On some targets, there must be some explicit actions taken after
- the inferior has been started up.
- */
+ the inferior has been started up. */
target_post_startup_inferior (pid_to_ptid (pid));
}
NULL, NULL);
/* We are at the first instruction we care about. */
observer_notify_inferior_created (¤t_target, from_tty);
- /* Pedal to the metal... */
+ /* Pedal to the metal... */
proceed ((CORE_ADDR) -1, TARGET_SIGNAL_0, 0);
}
-static void
-inf_ptrace_post_startup_inferior (ptid_t ptid)
-{
- /* This version of Unix doesn't require a meaningful "post startup inferior"
- operation by a debugger.
- */
-}
-
-static void
-inf_ptrace_acknowledge_created_inferior (int pid)
-{
- /* This version of Unix doesn't require a meaningful "acknowledge created inferior"
- operation by a debugger.
- */
-}
-
-static int
-inf_ptrace_insert_fork_catchpoint (int pid)
-{
- /* This version of Unix doesn't support notification of fork events. */
- return 0;
-}
-
-static int
-inf_ptrace_remove_fork_catchpoint (int pid)
-{
- /* This version of Unix doesn't support notification of fork events. */
- return 0;
-}
-
-static int
-inf_ptrace_insert_vfork_catchpoint (int pid)
-{
- /* This version of Unix doesn't support notification of vfork events. */
- return 0;
-}
-
-static int
-inf_ptrace_remove_vfork_catchpoint (int pid)
-{
- /* This version of Unix doesn't support notification of vfork events. */
- return 0;
-}
-
-static int
-inf_ptrace_follow_fork (int follow_child)
-{
- /* This version of Unix doesn't support following fork or vfork events. */
- return 0;
-}
-
-static int
-inf_ptrace_insert_exec_catchpoint (int pid)
-{
- /* This version of Unix doesn't support notification of exec events. */
- return 0;
-}
-
-static int
-inf_ptrace_remove_exec_catchpoint (int pid)
-{
- /* This version of Unix doesn't support notification of exec events. */
- return 0;
-}
-
static int
inf_ptrace_reported_exec_events_per_exec_call (void)
{
- /* This version of Unix doesn't support notification of exec events.
- */
+ /* Typically, we get a single SIGTRAP per exec. */
return 1;
}
return 1;
}
- /* ?? Do we really need to consult the event state, too? Assume the
- wait_state alone suffices.
- */
+ /* ??? Do we really need to consult the event state, too?
+ Assume the wait_state alone suffices. */
return 0;
}
/* Send a SIGINT to the process group. This acts just like the user
typed a ^C on the controlling terminal.
- XXX - This may not be correct for all systems. Some may want to
- use killpg() instead of kill (-pgrp). */
+ FIXME: This may not be correct for all systems. Some may want to
+ use killpg() instead of kill (-pgrp). */
static void
inf_ptrace_stop (void)
/* Copy data to be written over corresponding part of
buffer. */
- memcpy (buffer.byte + (offset - rounded_offset), writebuf, partial_len);
+ memcpy (buffer.byte + (offset - rounded_offset),
+ writebuf, partial_len);
errno = 0;
ptrace (PT_WRITE_D, PIDGET (inferior_ptid),
return normal_pid_to_str (ptid);
}
+/* Create a prototype ptrace target. The client can override it with
+ local methods. */
+
struct target_ops *
inf_ptrace_target (void)
{
struct target_ops *t = inf_child_target ();
+
t->to_open = inf_ptrace_open;
t->to_attach = inf_ptrace_attach;
t->to_post_attach = inf_ptrace_post_attach;
t->to_detach = inf_ptrace_detach;
t->to_resume = inf_ptrace_resume;
t->to_wait = inf_ptrace_wait;
- t->to_prepare_to_store = inf_ptrace_prepare_to_store;
t->to_xfer_partial = inf_ptrace_xfer_partial;
t->to_files_info = inf_ptrace_files_info;
t->to_kill = inf_ptrace_kill_inferior;
t->to_create_inferior = inf_ptrace_create_inferior;
- t->to_post_startup_inferior = inf_ptrace_post_startup_inferior;
- t->to_acknowledge_created_inferior =
- inf_ptrace_acknowledge_created_inferior;
- t->to_insert_fork_catchpoint = inf_ptrace_insert_fork_catchpoint;
- t->to_remove_fork_catchpoint = inf_ptrace_remove_fork_catchpoint;
- t->to_insert_vfork_catchpoint = inf_ptrace_insert_vfork_catchpoint;
- t->to_remove_vfork_catchpoint = inf_ptrace_remove_vfork_catchpoint;
- t->to_follow_fork = inf_ptrace_follow_fork;
- t->to_insert_exec_catchpoint = inf_ptrace_insert_exec_catchpoint;
- t->to_remove_exec_catchpoint = inf_ptrace_remove_exec_catchpoint;
t->to_reported_exec_events_per_exec_call =
inf_ptrace_reported_exec_events_per_exec_call;
t->to_has_exited = inf_ptrace_has_exited;
t->to_has_execution = 1;
t->to_magic = OPS_MAGIC;
ptrace_ops_hack = t;
+
+ return t;
+}
+\f
+
+/* Pointer to a function that returns the oggset within the user area
+ where a particular register is stored. */
+static CORE_ADDR (*inf_ptrace_register_u_offset)(int);
+
+/* Fetch register REGNUM from the inferior. */
+
+static void
+inf_ptrace_fetch_register (int regnum)
+{
+ CORE_ADDR addr;
+ size_t size;
+ PTRACE_TYPE_RET *buf;
+ int pid, i;
+
+ /* Cater for systems like GNU/Linux, that implement threads as
+ seperate processes. */
+ pid = ptid_get_lwp (inferior_ptid);
+ if (pid == 0)
+ pid = ptid_get_pid (inferior_ptid);
+
+ /* This isn't really an address, but ptrace thinks of it as one. */
+ addr = inf_ptrace_register_u_offset (regnum);
+ size = register_size (current_gdbarch, regnum);
+
+ gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0);
+ buf = alloca (size);
+
+ /* 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_READ_U, pid, (PTRACE_TYPE_ARG3) addr, 0);
+ if (errno != 0)
+ error ("Couldn't read register %s (#%d): %s.", REGISTER_NAME (regnum),
+ regnum, safe_strerror (errno));
+
+ addr += sizeof (PTRACE_TYPE_RET);
+ }
+ regcache_raw_supply (current_regcache, regnum, buf);
+}
+
+/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
+ for all registers. */
+
+static void
+inf_ptrace_fetch_registers (int regnum)
+{
+ if (regnum == -1)
+ for (regnum = 0; regnum < NUM_REGS; regnum++)
+ inf_ptrace_fetch_register (regnum);
+ else
+ inf_ptrace_fetch_register (regnum);
+}
+
+/* Store register REGNUM into the inferior. */
+
+static void
+inf_ptrace_store_register (int regnum)
+{
+ CORE_ADDR addr;
+ size_t size;
+ PTRACE_TYPE_RET *buf;
+ int pid, i;
+
+ /* Cater for systems like GNU/Linux, that implement threads as
+ seperate processes. */
+ pid = ptid_get_lwp (inferior_ptid);
+ if (pid == 0)
+ pid = ptid_get_pid (inferior_ptid);
+
+ /* This isn't really an address, but ptrace thinks of it as one. */
+ addr = inf_ptrace_register_u_offset (regnum);
+ size = register_size (current_gdbarch, regnum);
+
+ gdb_assert ((size % sizeof (PTRACE_TYPE_RET)) == 0);
+ buf = alloca (size);
+
+ /* Write the register contents into the inferior a chunk at the time. */
+ regcache_raw_collect (current_regcache, regnum, buf);
+ for (i = 0; i < size / sizeof (PTRACE_TYPE_RET); i++)
+ {
+ errno = 0;
+ ptrace (PT_WRITE_U, pid, (PTRACE_TYPE_ARG3) addr, buf[i]);
+ if (errno != 0)
+ error ("Couldn't write register %s (#%d): %s.", REGISTER_NAME (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
+inf_ptrace_store_registers (int regnum)
+{
+ if (regnum == -1)
+ for (regnum = 0; regnum < NUM_REGS; regnum++)
+ inf_ptrace_store_register (regnum);
+ else
+ inf_ptrace_store_register (regnum);
+}
+
+/* Create a "traditional" 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 *
+inf_ptrace_trad_target (CORE_ADDR (*register_u_offset)(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;
+
return t;
}
projects / deliverable / binutils-gdb.git / blobdiff