-/* Default child (native) target interface, for GDB when running under
- Unix.
+/* Base/prototype target for default child (native) targets.
- Copyright (C) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
- 1998, 1999, 2000, 2001, 2002, 2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 1988-2016 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 2 of the License, or
+ 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,
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, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor,
- Boston, MA 02110-1301, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+/* This file provides a common base class/target that all native
+ target implementations extend, by calling inf_child_target to get a
+ new prototype target and then overriding target methods as
+ necessary. */
#include "defs.h"
#include "regcache.h"
#include "symtab.h"
#include "target.h"
#include "inferior.h"
-#include "gdb_string.h"
+#include <sys/stat.h>
+#include "inf-child.h"
+#include "fileio.h"
+#include "agent.h"
+#include "gdb_wait.h"
+#include "filestuff.h"
+
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+/* A pointer to what is returned by inf_child_target. Used by
+ inf_child_open to push the most-derived target in reaction to
+ "target native". */
+static struct target_ops *inf_child_ops = NULL;
+
+/* Helper function for child_wait and the derivatives of child_wait.
+ HOSTSTATUS is the waitstatus from wait() or the equivalent; store our
+ translation of that in OURSTATUS. */
+void
+store_waitstatus (struct target_waitstatus *ourstatus, int hoststatus)
+{
+ if (WIFEXITED (hoststatus))
+ {
+ ourstatus->kind = TARGET_WAITKIND_EXITED;
+ ourstatus->value.integer = WEXITSTATUS (hoststatus);
+ }
+ else if (!WIFSTOPPED (hoststatus))
+ {
+ ourstatus->kind = TARGET_WAITKIND_SIGNALLED;
+ ourstatus->value.sig = gdb_signal_from_host (WTERMSIG (hoststatus));
+ }
+ else
+ {
+ ourstatus->kind = TARGET_WAITKIND_STOPPED;
+ ourstatus->value.sig = gdb_signal_from_host (WSTOPSIG (hoststatus));
+ }
+}
/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
for all registers. */
static void
-inf_child_fetch_inferior_registers (int regnum)
+inf_child_fetch_inferior_registers (struct target_ops *ops,
+ struct regcache *regcache, int regnum)
{
if (regnum == -1)
{
- for (regnum = 0; regnum < NUM_REGS; regnum++)
- regcache_raw_supply (current_regcache, regnum, NULL);
+ for (regnum = 0;
+ regnum < gdbarch_num_regs (get_regcache_arch (regcache));
+ regnum++)
+ regcache_raw_supply (regcache, regnum, NULL);
}
else
- regcache_raw_supply (current_regcache, regnum, NULL);
+ regcache_raw_supply (regcache, regnum, NULL);
}
/* Store register REGNUM back into the inferior. If REGNUM is -1, do
this for all registers (including the floating point registers). */
static void
-inf_child_store_inferior_registers (int regnum)
+inf_child_store_inferior_registers (struct target_ops *ops,
+ struct regcache *regcache, int regnum)
{
}
static void
-inf_child_post_attach (int pid)
+inf_child_post_attach (struct target_ops *self, int pid)
{
- /* This version of Unix doesn't require a meaningful "post attach"
- operation by a debugger. */
+ /* This target doesn't require a meaningful "post attach" operation
+ by a debugger. */
}
/* Get ready to modify the registers array. On machines which store
program being debugged. */
static void
-inf_child_prepare_to_store (void)
+inf_child_prepare_to_store (struct target_ops *self,
+ struct regcache *regcache)
{
}
-static void
-inf_child_open (char *arg, int from_tty)
+/* True if the user did "target native". In that case, we won't
+ unpush the child target automatically when the last inferior is
+ gone. */
+static int inf_child_explicitly_opened;
+
+/* See inf-child.h. */
+
+void
+inf_child_open_target (struct target_ops *target, const char *arg,
+ int from_tty)
{
- error (_("Use the \"run\" command to start a Unix child process."));
+ target_preopen (from_tty);
+ push_target (target);
+ inf_child_explicitly_opened = 1;
+ if (from_tty)
+ printf_filtered ("Done. Use the \"run\" command to start a process.\n");
}
static void
-inf_child_post_startup_inferior (ptid_t ptid)
+inf_child_open (const char *arg, int from_tty)
{
- /* This version of Unix doesn't require a meaningful "post startup
- inferior" operation by a debugger. */
+ inf_child_open_target (inf_child_ops, arg, from_tty);
}
+/* Implement the to_disconnect target_ops method. */
+
static void
-inf_child_acknowledge_created_inferior (int pid)
+inf_child_disconnect (struct target_ops *target, const char *args, int from_tty)
{
- /* This version of Unix doesn't require a meaningful "acknowledge
- created inferior" operation by a debugger. */
+ if (args != NULL)
+ error (_("Argument given to \"disconnect\"."));
+
+ /* This offers to detach/kill current inferiors, and then pops all
+ targets. */
+ target_preopen (from_tty);
}
+/* Implement the to_close target_ops method. */
+
static void
-inf_child_insert_fork_catchpoint (int pid)
+inf_child_close (struct target_ops *target)
{
- /* This version of Unix doesn't support notification of fork
- events. */
+ /* In case we were forcibly closed. */
+ inf_child_explicitly_opened = 0;
}
-static int
-inf_child_remove_fork_catchpoint (int pid)
+void
+inf_child_mourn_inferior (struct target_ops *ops)
{
- /* This version of Unix doesn't support notification of fork
- events. */
- return 0;
+ generic_mourn_inferior ();
+ inf_child_maybe_unpush_target (ops);
+}
+
+/* See inf-child.h. */
+
+void
+inf_child_maybe_unpush_target (struct target_ops *ops)
+{
+ if (!inf_child_explicitly_opened && !have_inferiors ())
+ unpush_target (ops);
}
static void
-inf_child_insert_vfork_catchpoint (int pid)
+inf_child_post_startup_inferior (struct target_ops *self, ptid_t ptid)
{
- /* This version of Unix doesn't support notification of vfork
- events. */
+ /* This target doesn't require a meaningful "post startup inferior"
+ operation by a debugger. */
}
static int
-inf_child_remove_vfork_catchpoint (int pid)
+inf_child_follow_fork (struct target_ops *ops, int follow_child,
+ int detach_fork)
{
- /* This version of Unix doesn't support notification of vfork
- events. */
+ /* This target doesn't support following fork or vfork events. */
return 0;
}
static int
-inf_child_follow_fork (struct target_ops *ops, int follow_child)
+inf_child_can_run (struct target_ops *self)
{
- /* This version of Unix doesn't support following fork or vfork
- events. */
- return 0;
+ return 1;
}
-static void
-inf_child_insert_exec_catchpoint (int pid)
+static char *
+inf_child_pid_to_exec_file (struct target_ops *self, int pid)
{
- /* This version of Unix doesn't support notification of exec
- events. */
+ /* This target doesn't support translation of a process ID to the
+ filename of the executable file. */
+ return NULL;
}
+/* Implementation of to_fileio_open. */
+
static int
-inf_child_remove_exec_catchpoint (int pid)
+inf_child_fileio_open (struct target_ops *self,
+ struct inferior *inf, const char *filename,
+ int flags, int mode, int warn_if_slow,
+ int *target_errno)
{
- /* This version of Unix doesn't support notification of exec
- events. */
- return 0;
+ int nat_flags;
+ mode_t nat_mode;
+ int fd;
+
+ if (fileio_to_host_openflags (flags, &nat_flags) == -1
+ || fileio_to_host_mode (mode, &nat_mode) == -1)
+ {
+ *target_errno = FILEIO_EINVAL;
+ return -1;
+ }
+
+ fd = gdb_open_cloexec (filename, nat_flags, nat_mode);
+ if (fd == -1)
+ *target_errno = host_to_fileio_error (errno);
+
+ return fd;
}
+/* Implementation of to_fileio_pwrite. */
+
static int
-inf_child_reported_exec_events_per_exec_call (void)
+inf_child_fileio_pwrite (struct target_ops *self,
+ int fd, const gdb_byte *write_buf, int len,
+ ULONGEST offset, int *target_errno)
{
- /* This version of Unix doesn't support notification of exec
- events. */
- return 1;
+ int ret;
+
+#ifdef HAVE_PWRITE
+ ret = pwrite (fd, write_buf, len, (long) offset);
+#else
+ ret = -1;
+#endif
+ /* If we have no pwrite or it failed for this file, use lseek/write. */
+ if (ret == -1)
+ {
+ ret = lseek (fd, (long) offset, SEEK_SET);
+ if (ret != -1)
+ ret = write (fd, write_buf, len);
+ }
+
+ if (ret == -1)
+ *target_errno = host_to_fileio_error (errno);
+
+ return ret;
}
+/* Implementation of to_fileio_pread. */
+
static int
-inf_child_can_run (void)
+inf_child_fileio_pread (struct target_ops *self,
+ int fd, gdb_byte *read_buf, int len,
+ ULONGEST offset, int *target_errno)
{
- return 1;
+ int ret;
+
+#ifdef HAVE_PREAD
+ ret = pread (fd, read_buf, len, (long) offset);
+#else
+ ret = -1;
+#endif
+ /* If we have no pread or it failed for this file, use lseek/read. */
+ if (ret == -1)
+ {
+ ret = lseek (fd, (long) offset, SEEK_SET);
+ if (ret != -1)
+ ret = read (fd, read_buf, len);
+ }
+
+ if (ret == -1)
+ *target_errno = host_to_fileio_error (errno);
+
+ return ret;
}
-static struct symtab_and_line *
-inf_child_enable_exception_callback (enum exception_event_kind kind,
- int enable)
+/* Implementation of to_fileio_fstat. */
+
+static int
+inf_child_fileio_fstat (struct target_ops *self, int fd,
+ struct stat *sb, int *target_errno)
{
- return (struct symtab_and_line *) NULL;
+ int ret;
+
+ ret = fstat (fd, sb);
+ if (ret == -1)
+ *target_errno = host_to_fileio_error (errno);
+
+ return ret;
}
-static struct exception_event_record *
-inf_child_get_current_exception_event (void)
+/* Implementation of to_fileio_close. */
+
+static int
+inf_child_fileio_close (struct target_ops *self, int fd, int *target_errno)
{
- return (struct exception_event_record *) NULL;
+ int ret;
+
+ ret = close (fd);
+ if (ret == -1)
+ *target_errno = host_to_fileio_error (errno);
+
+ return ret;
}
+/* Implementation of to_fileio_unlink. */
+
+static int
+inf_child_fileio_unlink (struct target_ops *self,
+ struct inferior *inf, const char *filename,
+ int *target_errno)
+{
+ int ret;
+
+ ret = unlink (filename);
+ if (ret == -1)
+ *target_errno = host_to_fileio_error (errno);
+
+ return ret;
+}
+
+/* Implementation of to_fileio_readlink. */
+
static char *
-inf_child_pid_to_exec_file (int pid)
+inf_child_fileio_readlink (struct target_ops *self,
+ struct inferior *inf, const char *filename,
+ int *target_errno)
{
- /* This version of Unix doesn't support translation of a process ID
- to the filename of the executable file. */
+ /* We support readlink only on systems that also provide a compile-time
+ maximum path length (PATH_MAX), at least for now. */
+#if defined (PATH_MAX)
+ char buf[PATH_MAX];
+ int len;
+ char *ret;
+
+ len = readlink (filename, buf, sizeof buf);
+ if (len < 0)
+ {
+ *target_errno = host_to_fileio_error (errno);
+ return NULL;
+ }
+
+ ret = (char *) xmalloc (len + 1);
+ memcpy (ret, buf, len);
+ ret[len] = '\0';
+ return ret;
+#else
+ *target_errno = FILEIO_ENOSYS;
return NULL;
+#endif
+}
+
+static int
+inf_child_use_agent (struct target_ops *self, int use)
+{
+ if (agent_loaded_p ())
+ {
+ use_agent = use;
+ return 1;
+ }
+ else
+ return 0;
+}
+
+static int
+inf_child_can_use_agent (struct target_ops *self)
+{
+ return agent_loaded_p ();
+}
+
+/* Default implementation of the to_can_async_p and
+ to_supports_non_stop methods. */
+
+static int
+return_zero (struct target_ops *ignore)
+{
+ return 0;
}
struct target_ops *
inf_child_target (void)
{
- struct target_ops *t = XZALLOC (struct target_ops);
- t->to_shortname = "child";
- t->to_longname = "Unix child process";
- t->to_doc = "Unix child process (started by the \"run\" command).";
+ struct target_ops *t = XCNEW (struct target_ops);
+
+ t->to_shortname = "native";
+ t->to_longname = "Native process";
+ t->to_doc = "Native process (started by the \"run\" command).";
t->to_open = inf_child_open;
+ t->to_close = inf_child_close;
+ t->to_disconnect = inf_child_disconnect;
t->to_post_attach = inf_child_post_attach;
t->to_fetch_registers = inf_child_fetch_inferior_registers;
t->to_store_registers = inf_child_store_inferior_registers;
t->to_prepare_to_store = inf_child_prepare_to_store;
t->to_insert_breakpoint = memory_insert_breakpoint;
t->to_remove_breakpoint = memory_remove_breakpoint;
- t->to_terminal_init = terminal_init_inferior;
- t->to_terminal_inferior = terminal_inferior;
- t->to_terminal_ours_for_output = terminal_ours_for_output;
- t->to_terminal_save_ours = terminal_save_ours;
- t->to_terminal_ours = terminal_ours;
+ t->to_terminal_init = child_terminal_init;
+ t->to_terminal_inferior = child_terminal_inferior;
+ t->to_terminal_ours_for_output = child_terminal_ours_for_output;
+ t->to_terminal_ours = child_terminal_ours;
t->to_terminal_info = child_terminal_info;
t->to_post_startup_inferior = inf_child_post_startup_inferior;
- t->to_acknowledge_created_inferior = inf_child_acknowledge_created_inferior;
- t->to_insert_fork_catchpoint = inf_child_insert_fork_catchpoint;
- t->to_remove_fork_catchpoint = inf_child_remove_fork_catchpoint;
- t->to_insert_vfork_catchpoint = inf_child_insert_vfork_catchpoint;
- t->to_remove_vfork_catchpoint = inf_child_remove_vfork_catchpoint;
t->to_follow_fork = inf_child_follow_fork;
- t->to_insert_exec_catchpoint = inf_child_insert_exec_catchpoint;
- t->to_remove_exec_catchpoint = inf_child_remove_exec_catchpoint;
- t->to_reported_exec_events_per_exec_call =
- inf_child_reported_exec_events_per_exec_call;
t->to_can_run = inf_child_can_run;
- t->to_enable_exception_callback = inf_child_enable_exception_callback;
- t->to_get_current_exception_event = inf_child_get_current_exception_event;
+ /* We must default these because they must be implemented by any
+ target that can run. */
+ t->to_can_async_p = return_zero;
+ t->to_supports_non_stop = return_zero;
t->to_pid_to_exec_file = inf_child_pid_to_exec_file;
t->to_stratum = process_stratum;
- t->to_has_all_memory = 1;
- t->to_has_memory = 1;
- t->to_has_stack = 1;
- t->to_has_registers = 1;
- t->to_has_execution = 1;
+ t->to_has_all_memory = default_child_has_all_memory;
+ t->to_has_memory = default_child_has_memory;
+ t->to_has_stack = default_child_has_stack;
+ t->to_has_registers = default_child_has_registers;
+ t->to_has_execution = default_child_has_execution;
+ t->to_fileio_open = inf_child_fileio_open;
+ t->to_fileio_pwrite = inf_child_fileio_pwrite;
+ t->to_fileio_pread = inf_child_fileio_pread;
+ t->to_fileio_fstat = inf_child_fileio_fstat;
+ t->to_fileio_close = inf_child_fileio_close;
+ t->to_fileio_unlink = inf_child_fileio_unlink;
+ t->to_fileio_readlink = inf_child_fileio_readlink;
t->to_magic = OPS_MAGIC;
+ t->to_use_agent = inf_child_use_agent;
+ t->to_can_use_agent = inf_child_can_use_agent;
+
+ /* Store a pointer so we can push the most-derived target from
+ inf_child_open. */
+ inf_child_ops = t;
+
return t;
}
projects / deliverable / binutils-gdb.git / blobdiff