/* Target-dependent code for GNU/Linux, architecture independent.
- Copyright (C) 2009-2020 Free Software Foundation, Inc.
+ Copyright (C) 2009-2021 Free Software Foundation, Inc.
This file is part of GDB.
static struct gdbarch_data *linux_gdbarch_data_handle;
struct linux_gdbarch_data
- {
- struct type *siginfo_type;
- };
+{
+ struct type *siginfo_type;
+ int num_disp_step_buffers;
+};
static void *
-init_linux_gdbarch_data (struct gdbarch *gdbarch)
+init_linux_gdbarch_data (struct obstack *obstack)
{
- return GDBARCH_OBSTACK_ZALLOC (gdbarch, struct linux_gdbarch_data);
+ return obstack_zalloc<linux_gdbarch_data> (obstack);
}
static struct linux_gdbarch_data *
yet. Positive if we tried looking it up, and found it. Negative
if we tried looking it up but failed. */
int vsyscall_range_p = 0;
+
+ /* Inferior's displaced step buffers. */
+ gdb::optional<displaced_step_buffers> disp_step_bufs;
};
/* Per-inferior data key. */
valid INFO pointer. */
static struct linux_info *
-get_linux_inferior_data (void)
+get_linux_inferior_data (inferior *inf)
{
- struct linux_info *info;
- struct inferior *inf = current_inferior ();
+ linux_info *info = linux_inferior_data.get (inf);
- info = linux_inferior_data.get (inf);
- if (info == NULL)
+ if (info == nullptr)
info = linux_inferior_data.emplace (inf);
return info;
static int
linux_vsyscall_range (struct gdbarch *gdbarch, struct mem_range *range)
{
- struct linux_info *info = get_linux_inferior_data ();
+ struct linux_info *info = get_linux_inferior_data (current_inferior ());
if (info->vsyscall_range_p == 0)
{
/* See linux-tdep.h. */
+displaced_step_prepare_status
+linux_displaced_step_prepare (gdbarch *arch, thread_info *thread,
+ CORE_ADDR &displaced_pc)
+{
+ linux_info *per_inferior = get_linux_inferior_data (thread->inf);
+
+ if (!per_inferior->disp_step_bufs.has_value ())
+ {
+ /* Figure out the location of the buffers. They are contiguous, starting
+ at DISP_STEP_BUF_ADDR. They are all of size BUF_LEN. */
+ CORE_ADDR disp_step_buf_addr
+ = linux_displaced_step_location (thread->inf->gdbarch);
+ int buf_len = gdbarch_max_insn_length (arch);
+
+ linux_gdbarch_data *gdbarch_data = get_linux_gdbarch_data (arch);
+ gdb_assert (gdbarch_data->num_disp_step_buffers > 0);
+
+ std::vector<CORE_ADDR> buffers;
+ for (int i = 0; i < gdbarch_data->num_disp_step_buffers; i++)
+ buffers.push_back (disp_step_buf_addr + i * buf_len);
+
+ per_inferior->disp_step_bufs.emplace (buffers);
+ }
+
+ return per_inferior->disp_step_bufs->prepare (thread, displaced_pc);
+}
+
+/* See linux-tdep.h. */
+
+displaced_step_finish_status
+linux_displaced_step_finish (gdbarch *arch, thread_info *thread, gdb_signal sig)
+{
+ linux_info *per_inferior = get_linux_inferior_data (thread->inf);
+
+ gdb_assert (per_inferior->disp_step_bufs.has_value ());
+
+ return per_inferior->disp_step_bufs->finish (arch, thread, sig);
+}
+
+/* See linux-tdep.h. */
+
+const displaced_step_copy_insn_closure *
+linux_displaced_step_copy_insn_closure_by_addr (inferior *inf, CORE_ADDR addr)
+{
+ linux_info *per_inferior = linux_inferior_data.get (inf);
+
+ if (per_inferior == nullptr
+ || !per_inferior->disp_step_bufs.has_value ())
+ return nullptr;
+
+ return per_inferior->disp_step_bufs->copy_insn_closure_by_addr (addr);
+}
+
+/* See linux-tdep.h. */
+
+void
+linux_displaced_step_restore_all_in_ptid (inferior *parent_inf, ptid_t ptid)
+{
+ linux_info *per_inferior = linux_inferior_data.get (parent_inf);
+
+ if (per_inferior == nullptr
+ || !per_inferior->disp_step_bufs.has_value ())
+ return;
+
+ per_inferior->disp_step_bufs->restore_in_ptid (ptid);
+}
+
+/* See linux-tdep.h. */
+
CORE_ADDR
linux_get_hwcap (struct target_ops *target)
{
}
/* To be called from the various GDB_OSABI_LINUX handlers for the
- various GNU/Linux architectures and machine types. */
+ various GNU/Linux architectures and machine types.
+
+ NUM_DISP_STEP_BUFFERS is the number of displaced step buffers to use. If 0,
+ displaced stepping is not supported. */
void
-linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
+linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch,
+ int num_disp_step_buffers)
{
+ if (num_disp_step_buffers > 0)
+ {
+ linux_gdbarch_data *gdbarch_data = get_linux_gdbarch_data (gdbarch);
+ gdbarch_data->num_disp_step_buffers = num_disp_step_buffers;
+
+ set_gdbarch_displaced_step_prepare (gdbarch,
+ linux_displaced_step_prepare);
+ set_gdbarch_displaced_step_finish (gdbarch, linux_displaced_step_finish);
+ set_gdbarch_displaced_step_copy_insn_closure_by_addr
+ (gdbarch, linux_displaced_step_copy_insn_closure_by_addr);
+ set_gdbarch_displaced_step_restore_all_in_ptid
+ (gdbarch, linux_displaced_step_restore_all_in_ptid);
+ }
+
set_gdbarch_core_pid_to_str (gdbarch, linux_core_pid_to_str);
set_gdbarch_info_proc (gdbarch, linux_info_proc);
set_gdbarch_core_info_proc (gdbarch, linux_core_info_proc);
_initialize_linux_tdep ()
{
linux_gdbarch_data_handle =
- gdbarch_data_register_post_init (init_linux_gdbarch_data);
+ gdbarch_data_register_pre_init (init_linux_gdbarch_data);
/* Observers used to invalidate the cache when needed. */
gdb::observers::inferior_exit.attach (invalidate_linux_cache_inf);
gdb::observers::inferior_appeared.attach (invalidate_linux_cache_inf);
+ gdb::observers::inferior_execd.attach (invalidate_linux_cache_inf);
add_setshow_boolean_cmd ("use-coredump-filter", class_files,
&use_coredump_filter, _("\
projects / binutils-gdb.git / blobdiff