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authorDaniel Jacobowitz <drow@false.org>2003-08-17 18:22:25 +0000
committerDaniel Jacobowitz <drow@false.org>2003-08-17 18:22:25 +0000
commit4de4c07c6b48659ae212352236be9413c853a23c (patch)
tree5aeb62d1cb427760fda2a718d4faf154963827a7
parent2b66634babe795d9b28487625b8e701fff866482 (diff)
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* Makefile.in (i386-linux-nat.o): Update dependencies.
* config/i386/nm-linux.h (LINUX_CHILD_POST_STARTUP_INFERIOR): Define. * config/nm-linux.h (CHILD_POST_STARTUP_INFERIOR, CHILD_POST_ATTACH) (CHILD_FOLLOW_FORK, KILL_INFERIOR): Define. * i386-linux-nat.c: Include "linux-nat.h". (child_post_startup_inferior): New function. * i386-nat.c (child_post_startup_inferior): Wrap in #ifdef. * infptrace.c (kill_inferior): Wrap in #ifdef. * lin-lwp.c (lin_lwp_attach_lwp): Call child_post_attach after attaching to each LWP. (child_wait, lin_lwp_wait): Call linux_handle_extended_wait. (init_lin_lwp_ops): Fill in some more operations. * linux-nat.h (linux_enable_event_reporting) (linux_handle_extended_wait, linux_child_post_startup_inferior): New prototypes. * linux-nat.c (linux_enable_event_reporting): New function. (child_post_attach, linux_child_post_startup_inferior) (child_post_startup_inferior, child_follow_fork) (linux_handle_extended_wait, kill_inferior): New functions.
-rw-r--r--gdb/ChangeLog22
-rw-r--r--gdb/Makefile.in2
-rw-r--r--gdb/config/i386/nm-linux.h9
-rw-r--r--gdb/config/nm-linux.h4
-rw-r--r--gdb/i386-linux-nat.c8
-rw-r--r--gdb/i386-nat.c2
-rw-r--r--gdb/infptrace.c2
-rw-r--r--gdb/lin-lwp.c20
-rw-r--r--gdb/linux-nat.c181
-rw-r--r--gdb/linux-nat.h5
10 files changed, 251 insertions, 4 deletions
diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 225cafe..672e055 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,25 @@
+2003-08-17 Daniel Jacobowitz <drow@mvista.com>
+
+ * Makefile.in (i386-linux-nat.o): Update dependencies.
+ * config/i386/nm-linux.h (LINUX_CHILD_POST_STARTUP_INFERIOR): Define.
+ * config/nm-linux.h (CHILD_POST_STARTUP_INFERIOR, CHILD_POST_ATTACH)
+ (CHILD_FOLLOW_FORK, KILL_INFERIOR): Define.
+ * i386-linux-nat.c: Include "linux-nat.h".
+ (child_post_startup_inferior): New function.
+ * i386-nat.c (child_post_startup_inferior): Wrap in #ifdef.
+ * infptrace.c (kill_inferior): Wrap in #ifdef.
+ * lin-lwp.c (lin_lwp_attach_lwp): Call child_post_attach after
+ attaching to each LWP.
+ (child_wait, lin_lwp_wait): Call linux_handle_extended_wait.
+ (init_lin_lwp_ops): Fill in some more operations.
+ * linux-nat.h (linux_enable_event_reporting)
+ (linux_handle_extended_wait, linux_child_post_startup_inferior): New
+ prototypes.
+ * linux-nat.c (linux_enable_event_reporting): New function.
+ (child_post_attach, linux_child_post_startup_inferior)
+ (child_post_startup_inferior, child_follow_fork)
+ (linux_handle_extended_wait, kill_inferior): New functions.
+
2003-08-16 Andrew Cagney <cagney@redhat.com>
* gdbarch.sh: Delete all #if not GDB_MULTI_ARCH code.
diff --git a/gdb/Makefile.in b/gdb/Makefile.in
index 99534aa..c2e3d0e 100644
--- a/gdb/Makefile.in
+++ b/gdb/Makefile.in
@@ -1843,7 +1843,7 @@ i386-interix-tdep.o: i386-interix-tdep.c $(defs_h) $(arch_utils_h) \
i386-linux-nat.o: i386-linux-nat.c $(defs_h) $(inferior_h) $(gdbcore_h) \
$(regcache_h) $(gdb_assert_h) $(gdb_string_h) $(gregset_h) \
$(i387_tdep_h) $(i386_tdep_h) $(i386_linux_tdep_h) \
- $(gdb_proc_service_h)
+ $(gdb_proc_service_h) $(linux_nat_h)
i386-linux-tdep.o: i386-linux-tdep.c $(defs_h) $(gdbcore_h) $(frame_h) \
$(value_h) $(regcache_h) $(inferior_h) $(reggroups_h) $(symtab_h) \
$(symfile_h) $(objfiles_h) $(solib_svr4_h) $(osabi_h) $(i386_tdep_h) \
diff --git a/gdb/config/i386/nm-linux.h b/gdb/config/i386/nm-linux.h
index ad57124..1df875f 100644
--- a/gdb/config/i386/nm-linux.h
+++ b/gdb/config/i386/nm-linux.h
@@ -82,4 +82,13 @@ extern int cannot_store_register (int regno);
/* Override child_resume in `infptrace.c'. */
#define CHILD_RESUME
+/* `linux-nat.c' and `i386-nat.c' have their own versions of
+ child_post_startup_inferior. Define this to use the copy in
+ `i386-linux-nat.c' instead, which calls both.
+
+ NOTE drow/2003-08-17: This is ugly beyond words, but properly
+ fixing it will require some serious surgery. Ideally the target
+ stack could be used for this. */
+#define LINUX_CHILD_POST_STARTUP_INFERIOR
+
#endif /* nm-linux.h */
diff --git a/gdb/config/nm-linux.h b/gdb/config/nm-linux.h
index 9a04cf7..5d4175c 100644
--- a/gdb/config/nm-linux.h
+++ b/gdb/config/nm-linux.h
@@ -73,3 +73,7 @@ extern void lin_thread_get_thread_signals (sigset_t *mask);
#define CHILD_INSERT_FORK_CATCHPOINT
#define CHILD_INSERT_VFORK_CATCHPOINT
#define CHILD_INSERT_EXEC_CATCHPOINT
+#define CHILD_POST_STARTUP_INFERIOR
+#define CHILD_POST_ATTACH
+#define CHILD_FOLLOW_FORK
+#define KILL_INFERIOR
diff --git a/gdb/i386-linux-nat.c b/gdb/i386-linux-nat.c
index 81be404..4549b37 100644
--- a/gdb/i386-linux-nat.c
+++ b/gdb/i386-linux-nat.c
@@ -23,6 +23,7 @@
#include "inferior.h"
#include "gdbcore.h"
#include "regcache.h"
+#include "linux-nat.h"
#include "gdb_assert.h"
#include "gdb_string.h"
@@ -890,6 +891,13 @@ child_resume (ptid_t ptid, int step, enum target_signal signal)
if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1)
perror_with_name ("ptrace");
}
+
+void
+child_post_startup_inferior (ptid_t ptid)
+{
+ i386_cleanup_dregs ();
+ linux_child_post_startup_inferior (ptid);
+}
/* Register that we are able to handle GNU/Linux ELF core file
diff --git a/gdb/i386-nat.c b/gdb/i386-nat.c
index 53a81a4..73794bc 100644
--- a/gdb/i386-nat.c
+++ b/gdb/i386-nat.c
@@ -230,6 +230,7 @@ i386_cleanup_dregs (void)
dr_status_mirror = 0;
}
+#ifndef LINUX_CHILD_POST_STARTUP_INFERIOR
/* Reset all debug registers at each new startup
to avoid missing watchpoints after restart. */
void
@@ -237,6 +238,7 @@ child_post_startup_inferior (ptid_t ptid)
{
i386_cleanup_dregs ();
}
+#endif /* LINUX_CHILD_POST_STARTUP_INFERIOR */
/* Print the values of the mirrored debug registers.
This is called when maint_show_dr is non-zero. To set that
diff --git a/gdb/infptrace.c b/gdb/infptrace.c
index 6147cbe..5df9f6d 100644
--- a/gdb/infptrace.c
+++ b/gdb/infptrace.c
@@ -208,6 +208,7 @@ ptrace_wait (ptid_t ptid, int *status)
return wstate;
}
+#ifndef KILL_INFERIOR
void
kill_inferior (void)
{
@@ -229,6 +230,7 @@ kill_inferior (void)
ptrace_wait (null_ptid, &status);
target_mourn_inferior ();
}
+#endif /* KILL_INFERIOR */
#ifndef CHILD_RESUME
diff --git a/gdb/lin-lwp.c b/gdb/lin-lwp.c
index a82adb7..b168b05 100644
--- a/gdb/lin-lwp.c
+++ b/gdb/lin-lwp.c
@@ -324,6 +324,8 @@ lin_lwp_attach_lwp (ptid_t ptid, int verbose)
gdb_assert (pid == GET_LWP (ptid)
&& WIFSTOPPED (status) && WSTOPSIG (status));
+ child_post_attach (pid);
+
lp->stopped = 1;
if (debug_lin_lwp)
@@ -1067,6 +1069,10 @@ child_wait (ptid_t ptid, struct target_waitstatus *ourstatus)
return minus_one_ptid;
}
+ /* Handle GNU/Linux's extended waitstatus for trace events. */
+ if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0)
+ return linux_handle_extended_wait (pid, status, ourstatus);
+
store_waitstatus (ourstatus, status);
return pid_to_ptid (pid);
}
@@ -1488,6 +1494,14 @@ retry:
else
trap_ptid = null_ptid;
+ /* Handle GNU/Linux's extended waitstatus for trace events. */
+ if (WIFSTOPPED (status) && WSTOPSIG (status) == SIGTRAP && status >> 16 != 0)
+ {
+ linux_handle_extended_wait (ptid_get_pid (trap_ptid),
+ status, ourstatus);
+ return trap_ptid;
+ }
+
store_waitstatus (ourstatus, status);
return (threaded ? lp->ptid : pid_to_ptid (GET_LWP (lp->ptid)));
}
@@ -1657,6 +1671,12 @@ init_lin_lwp_ops (void)
lin_lwp_ops.to_mourn_inferior = lin_lwp_mourn_inferior;
lin_lwp_ops.to_thread_alive = lin_lwp_thread_alive;
lin_lwp_ops.to_pid_to_str = lin_lwp_pid_to_str;
+ lin_lwp_ops.to_post_startup_inferior = child_post_startup_inferior;
+ lin_lwp_ops.to_post_attach = child_post_attach;
+ lin_lwp_ops.to_insert_fork_catchpoint = child_insert_fork_catchpoint;
+ lin_lwp_ops.to_insert_vfork_catchpoint = child_insert_vfork_catchpoint;
+ lin_lwp_ops.to_insert_exec_catchpoint = child_insert_exec_catchpoint;
+
lin_lwp_ops.to_stratum = thread_stratum;
lin_lwp_ops.to_has_thread_control = tc_schedlock;
lin_lwp_ops.to_magic = OPS_MAGIC;
diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c
index 61931c6..0dd83e7 100644
--- a/gdb/linux-nat.c
+++ b/gdb/linux-nat.c
@@ -56,6 +56,8 @@
#define __WALL 0x40000000 /* Wait for any child. */
#endif
+extern struct target_ops child_ops;
+
struct simple_pid_list
{
int pid;
@@ -189,13 +191,147 @@ linux_supports_tracefork (void)
}
+void
+linux_enable_event_reporting (ptid_t ptid)
+{
+ int pid = ptid_get_pid (ptid);
+ int options;
+
+ if (! linux_supports_tracefork ())
+ return;
+
+ options = PTRACE_O_TRACEFORK;
+
+ ptrace (PTRACE_SETOPTIONS, pid, 0, options);
+}
+
+void
+child_post_attach (int pid)
+{
+ linux_enable_event_reporting (pid_to_ptid (pid));
+}
+
+void
+linux_child_post_startup_inferior (ptid_t ptid)
+{
+ linux_enable_event_reporting (ptid);
+}
+
+#ifndef LINUX_CHILD_POST_STARTUP_INFERIOR
+void
+child_post_startup_inferior (ptid_t ptid)
+{
+ linux_child_post_startup_inferior (ptid);
+}
+#endif
+
int
-child_insert_fork_catchpoint (int pid)
+child_follow_fork (int follow_child)
{
- if (linux_supports_tracefork ())
- error ("Fork catchpoints have not been implemented yet.");
+ ptid_t last_ptid;
+ struct target_waitstatus last_status;
+ int parent_pid, child_pid;
+
+ get_last_target_status (&last_ptid, &last_status);
+ parent_pid = ptid_get_pid (last_ptid);
+ child_pid = last_status.value.related_pid;
+
+ if (! follow_child)
+ {
+ /* We're already attached to the parent, by default. */
+
+ /* Before detaching from the child, remove all breakpoints from
+ it. (This won't actually modify the breakpoint list, but will
+ physically remove the breakpoints from the child.) */
+ detach_breakpoints (child_pid);
+
+ fprintf_filtered (gdb_stdout,
+ "Detaching after fork from child process %d.\n",
+ child_pid);
+
+ ptrace (PTRACE_DETACH, child_pid, 0, 0);
+ }
else
+ {
+ char child_pid_spelling[40];
+
+ /* Needed to keep the breakpoint lists in sync. */
+ detach_breakpoints (child_pid);
+
+ /* Before detaching from the parent, remove all breakpoints from it. */
+ remove_breakpoints ();
+
+ fprintf_filtered (gdb_stdout,
+ "Attaching after fork to child process %d.\n",
+ child_pid);
+
+ target_detach (NULL, 0);
+
+ inferior_ptid = pid_to_ptid (child_pid);
+ push_target (&child_ops);
+
+ /* Reset breakpoints in the child as appropriate. */
+ follow_inferior_reset_breakpoints ();
+ }
+
+ return 0;
+}
+
+ptid_t
+linux_handle_extended_wait (int pid, int status,
+ struct target_waitstatus *ourstatus)
+{
+ int event = status >> 16;
+
+ if (event == PTRACE_EVENT_CLONE)
+ internal_error (__FILE__, __LINE__,
+ "unexpected clone event");
+
+ if (event == PTRACE_EVENT_FORK)
+ {
+ unsigned long new_pid;
+ int ret;
+
+ ptrace (PTRACE_GETEVENTMSG, pid, 0, &new_pid);
+
+ /* If we haven't already seen the new PID stop, wait for it now. */
+ if (! pull_pid_from_list (&stopped_pids, new_pid))
+ {
+ /* The new child has a pending SIGSTOP. We can't affect it until it
+ hits the SIGSTOP, but we're already attached.
+
+ It won't be a clone (we didn't ask for clones in the event mask)
+ so we can just call waitpid and wait for the SIGSTOP. */
+ do {
+ ret = waitpid (new_pid, &status, 0);
+ } while (ret == -1 && errno == EINTR);
+ if (ret == -1)
+ perror_with_name ("waiting for new child");
+ else if (ret != new_pid)
+ internal_error (__FILE__, __LINE__,
+ "wait returned unexpected PID %d", ret);
+ else if (!WIFSTOPPED (status) || WSTOPSIG (status) != SIGSTOP)
+ internal_error (__FILE__, __LINE__,
+ "wait returned unexpected status 0x%x", status);
+ }
+
+ ourstatus->kind = TARGET_WAITKIND_FORKED;
+ ourstatus->value.related_pid = new_pid;
+ return inferior_ptid;
+ }
+
+ internal_error (__FILE__, __LINE__,
+ "unknown ptrace event %d", event);
+}
+
+
+int
+child_insert_fork_catchpoint (int pid)
+{
+ if (! linux_supports_tracefork ())
error ("Your system does not support fork catchpoints.");
+
+ return 0;
}
int
@@ -216,4 +352,43 @@ child_insert_exec_catchpoint (int pid)
error ("Your system does not support exec catchpoints.");
}
+void
+kill_inferior (void)
+{
+ int status;
+ int pid = PIDGET (inferior_ptid);
+ struct target_waitstatus last;
+ ptid_t last_ptid;
+ int ret;
+
+ if (pid == 0)
+ return;
+
+ /* If we're stopped while forking and we haven't followed yet, kill the
+ other task. We need to do this first because the parent will be
+ sleeping if this is a vfork. */
+
+ get_last_target_status (&last_ptid, &last);
+ if (last.kind == TARGET_WAITKIND_FORKED
+ || last.kind == TARGET_WAITKIND_VFORKED)
+ {
+ ptrace (PT_KILL, last.value.related_pid);
+ ptrace_wait (null_ptid, &status);
+ }
+
+ /* Kill the current process. */
+ ptrace (PT_KILL, pid, (PTRACE_ARG3_TYPE) 0, 0);
+ ret = ptrace_wait (null_ptid, &status);
+
+ /* We might get a SIGCHLD instead of an exit status. This is
+ aggravated by the first kill above - a child has just died. */
+
+ while (ret == pid && WIFSTOPPED (status))
+ {
+ ptrace (PT_KILL, pid, (PTRACE_ARG3_TYPE) 0, 0);
+ ret = ptrace_wait (null_ptid, &status);
+ }
+
+ target_mourn_inferior ();
+}
diff --git a/gdb/linux-nat.h b/gdb/linux-nat.h
index b0d9600..90652aa 100644
--- a/gdb/linux-nat.h
+++ b/gdb/linux-nat.h
@@ -65,7 +65,12 @@ extern int linux_proc_xfer_memory (CORE_ADDR addr, char *myaddr, int len,
int write, struct mem_attrib *attrib,
struct target_ops *target);
+/* linux-nat functions for handling fork events. */
extern void linux_record_stopped_pid (int pid);
+extern void linux_enable_event_reporting (ptid_t ptid);
+extern ptid_t linux_handle_extended_wait (int pid, int status,
+ struct target_waitstatus *ourstatus);
+extern void linux_child_post_startup_inferior (ptid_t ptid);
/* Iterator function for lin-lwp's lwp list. */
struct lwp_info *iterate_over_lwps (int (*callback) (struct lwp_info *,