add the cleanup checker

[deliverable/binutils-gdb.git] / gdb / i386-linux-nat.c

diff --git a/gdb/i386-linux-nat.c b/gdb/i386-linux-nat.c
index 4b1b20fc266b0d902232cfc95e41e63488777d40..be2b6c9f9c95c0798b00a2e9f772da6aba5f4fb7 100644 (file)
--- a/gdb/i386-linux-nat.c
+++ b/gdb/i386-linux-nat.c
@@ -1,6 +1,6 @@
 /* Native-dependent code for GNU/Linux i386.
 
-   Copyright (C) 1999-2012 Free Software Foundation, Inc.
+   Copyright (C) 1999-2013 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -25,6 +25,8 @@
 #include "regset.h"
 #include "target.h"
 #include "linux-nat.h"
+#include "linux-btrace.h"
+#include "btrace.h"
 
 #include "gdb_assert.h"
 #include "gdb_string.h"
@@ -769,9 +771,13 @@ i386_linux_prepare_to_resume (struct lwp_info *lwp)
 
   if (lwp->arch_private->debug_registers_changed)
     {
-      struct i386_debug_reg_state *state = i386_debug_reg_state ();
+      struct i386_debug_reg_state *state
+       = i386_debug_reg_state (ptid_get_pid (lwp->ptid));
       int i;
 
+      /* See amd64_linux_prepare_to_resume for Linux kernel note on
+        i386_linux_dr_set calls ordering.  */
+
       for (i = DR_FIRSTADDR; i <= DR_LASTADDR; i++)
        if (state->dr_ref_count[i] > 0)
          {
@@ -802,6 +808,41 @@ i386_linux_new_thread (struct lwp_info *lp)
 
   lp->arch_private = info;
 }
+
+/* linux_nat_new_fork hook.   */
+
+static void
+i386_linux_new_fork (struct lwp_info *parent, pid_t child_pid)
+{
+  pid_t parent_pid;
+  struct i386_debug_reg_state *parent_state;
+  struct i386_debug_reg_state *child_state;
+
+  /* NULL means no watchpoint has ever been set in the parent.  In
+     that case, there's nothing to do.  */
+  if (parent->arch_private == NULL)
+    return;
+
+  /* Linux kernel before 2.6.33 commit
+     72f674d203cd230426437cdcf7dd6f681dad8b0d
+     will inherit hardware debug registers from parent
+     on fork/vfork/clone.  Newer Linux kernels create such tasks with
+     zeroed debug registers.
+
+     GDB core assumes the child inherits the watchpoints/hw
+     breakpoints of the parent, and will remove them all from the
+     forked off process.  Copy the debug registers mirrors into the
+     new process so that all breakpoints and watchpoints can be
+     removed together.  The debug registers mirror will become zeroed
+     in the end before detaching the forked off process, thus making
+     this compatible with older Linux kernels too.  */
+
+  parent_pid = ptid_get_pid (parent->ptid);
+  parent_state = i386_debug_reg_state (parent_pid);
+  child_state = i386_debug_reg_state (child_pid);
+  *child_state = *parent_state;
+}
+
 \f
 
 /* Called by libthread_db.  Returns a pointer to the thread local
@@ -874,7 +915,7 @@ static const unsigned char linux_syscall[] = { 0xcd, 0x80 };
 
 static void
 i386_linux_resume (struct target_ops *ops,
-                  ptid_t ptid, int step, enum target_signal signal)
+                  ptid_t ptid, int step, enum gdb_signal signal)
 {
   int pid = PIDGET (ptid);
 
@@ -937,7 +978,7 @@ i386_linux_resume (struct target_ops *ops,
        }
     }
 
-  if (ptrace (request, pid, 0, target_signal_to_host (signal)) == -1)
+  if (ptrace (request, pid, 0, gdb_signal_to_host (signal)) == -1)
     perror_with_name (("ptrace"));
 }
 
@@ -1007,6 +1048,51 @@ i386_linux_read_description (struct target_ops *ops)
     return tdesc_i386_linux;
 }
 
+/* Enable branch tracing.  */
+
+static struct btrace_target_info *
+i386_linux_enable_btrace (ptid_t ptid)
+{
+  struct btrace_target_info *tinfo;
+  struct gdbarch *gdbarch;
+
+  errno = 0;
+  tinfo = linux_enable_btrace (ptid);
+
+  if (tinfo == NULL)
+    error (_("Could not enable branch tracing for %s: %s."),
+          target_pid_to_str (ptid), safe_strerror (errno));
+
+  /* Fill in the size of a pointer in bits.  */
+  gdbarch = target_thread_architecture (ptid);
+  tinfo->ptr_bits = gdbarch_ptr_bit (gdbarch);
+
+  return tinfo;
+}
+
+/* Disable branch tracing.  */
+
+static void
+i386_linux_disable_btrace (struct btrace_target_info *tinfo)
+{
+  int errcode = linux_disable_btrace (tinfo);
+
+  if (errcode != 0)
+    error (_("Could not disable branch tracing: %s."), safe_strerror (errcode));
+}
+
+/* Teardown branch tracing.  */
+
+static void
+i386_linux_teardown_btrace (struct btrace_target_info *tinfo)
+{
+  /* Ignore errors.  */
+  linux_disable_btrace (tinfo);
+}
+
+/* -Wmissing-prototypes */
+extern initialize_file_ftype _initialize_i386_linux_nat;
+
 void
 _initialize_i386_linux_nat (void)
 {
@@ -1037,8 +1123,17 @@ _initialize_i386_linux_nat (void)
 
   t->to_read_description = i386_linux_read_description;
 
+  /* Add btrace methods.  */
+  t->to_supports_btrace = linux_supports_btrace;
+  t->to_enable_btrace = i386_linux_enable_btrace;
+  t->to_disable_btrace = i386_linux_disable_btrace;
+  t->to_teardown_btrace = i386_linux_teardown_btrace;
+  t->to_read_btrace = linux_read_btrace;
+
   /* Register the target.  */
   linux_nat_add_target (t);
   linux_nat_set_new_thread (t, i386_linux_new_thread);
+  linux_nat_set_new_fork (t, i386_linux_new_fork);
+  linux_nat_set_forget_process (t, i386_forget_process);
   linux_nat_set_prepare_to_resume (t, i386_linux_prepare_to_resume);
 }