/* Native-dependent code for GNU/Linux x86-64.
- Copyright (C) 2001-2012 Free Software Foundation, Inc.
+ Copyright (C) 2001-2013 Free Software Foundation, Inc.
Contributed by Jiri Smid, SuSE Labs.
This file is part of GDB.
#include "regset.h"
#include "linux-nat.h"
#include "amd64-linux-tdep.h"
+#include "linux-btrace.h"
+#include "btrace.h"
#include "gdb_assert.h"
#include "gdb_string.h"
#include <sys/debugreg.h>
#include <sys/syscall.h>
#include <sys/procfs.h>
+#include <sys/user.h>
#include <asm/prctl.h>
/* FIXME ezannoni-2003-07-09: we need <sys/reg.h> to be included after
<asm/ptrace.h> because the latter redefines FS and GS for no apparent
return amd64_linux_dr_get (inferior_ptid, DR_STATUS);
}
-/* Callback for linux_nat_iterate_watchpoint_lwps. Update the debug registers
- of LWP. */
+/* Callback for iterate_over_lwps. Update the debug registers of
+ LWP. */
static int
update_debug_registers_callback (struct lwp_info *lwp, void *arg)
static void
amd64_linux_dr_set_control (unsigned long control)
{
- linux_nat_iterate_watchpoint_lwps (update_debug_registers_callback, NULL);
+ ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid));
+
+ iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL);
}
/* Set address REGNUM (zero based) to ADDR in all LWPs of the current
static void
amd64_linux_dr_set_addr (int regnum, CORE_ADDR addr)
{
+ ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (inferior_ptid));
+
gdb_assert (regnum >= 0 && regnum <= DR_LASTADDR - DR_FIRSTADDR);
- linux_nat_iterate_watchpoint_lwps (update_debug_registers_callback, NULL);
+ iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL);
}
/* Called when resuming a thread.
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;
/* On Linux kernel before 2.6.33 commit
lp->arch_private = info;
}
+
+/* linux_nat_new_fork hook. */
+
+static void
+amd64_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
/* This function is called by libthread_db as part of its handling of
ps_get_thread_area (const struct ps_prochandle *ph,
lwpid_t lwpid, int idx, void **base)
{
- if (gdbarch_bfd_arch_info (target_gdbarch)->bits_per_word == 32)
+ if (gdbarch_bfd_arch_info (target_gdbarch ())->bits_per_word == 32)
{
/* The full structure is found in <asm-i386/ldt.h>. The second
integer is the LDT's base_address and that is used to locate
switch (idx)
{
case FS:
+#ifdef HAVE_STRUCT_USER_REGS_STRUCT_FS_BASE
+ {
+ /* PTRACE_ARCH_PRCTL is obsolete since 2.6.25, where the
+ fs_base and gs_base fields of user_regs_struct can be
+ used directly. */
+ unsigned long fs;
+ errno = 0;
+ fs = ptrace (PTRACE_PEEKUSER, lwpid,
+ offsetof (struct user_regs_struct, fs_base), 0);
+ if (errno == 0)
+ {
+ *base = (void *) fs;
+ return PS_OK;
+ }
+ }
+#endif
if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_FS) == 0)
return PS_OK;
break;
case GS:
+#ifdef HAVE_STRUCT_USER_REGS_STRUCT_GS_BASE
+ {
+ unsigned long gs;
+ errno = 0;
+ gs = ptrace (PTRACE_PEEKUSER, lwpid,
+ offsetof (struct user_regs_struct, gs_base), 0);
+ if (errno == 0)
+ {
+ *base = (void *) gs;
+ return PS_OK;
+ }
+ }
+#endif
if (ptrace (PTRACE_ARCH_PRCTL, lwpid, base, ARCH_GET_GS) == 0)
return PS_OK;
break;
}
}
+/* Enable branch tracing. */
+
+static struct btrace_target_info *
+amd64_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
+amd64_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
+amd64_linux_teardown_btrace (struct btrace_target_info *tinfo)
+{
+ /* Ignore errors. */
+ linux_disable_btrace (tinfo);
+}
+
/* Provide a prototype to silence -Wmissing-prototypes. */
void _initialize_amd64_linux_nat (void);
t->to_read_description = amd64_linux_read_description;
+ /* Add btrace methods. */
+ t->to_supports_btrace = linux_supports_btrace;
+ t->to_enable_btrace = amd64_linux_enable_btrace;
+ t->to_disable_btrace = amd64_linux_disable_btrace;
+ t->to_teardown_btrace = amd64_linux_teardown_btrace;
+ t->to_read_btrace = linux_read_btrace;
+
/* Register the target. */
linux_nat_add_target (t);
linux_nat_set_new_thread (t, amd64_linux_new_thread);
+ linux_nat_set_new_fork (t, amd64_linux_new_fork);
+ linux_nat_set_forget_process (t, i386_forget_process);
linux_nat_set_siginfo_fixup (t, amd64_linux_siginfo_fixup);
linux_nat_set_prepare_to_resume (t, amd64_linux_prepare_to_resume);
}
projects / deliverable / binutils-gdb.git / blobdiff