ODR warnings for "struct coff_symbol"

[binutils-gdb.git] / gdb / nios2-linux-tdep.c

diff --git a/gdb/nios2-linux-tdep.c b/gdb/nios2-linux-tdep.c
index 75949913762cd6cdd7ab25e8c1b073e2c954964e..a32f79aa28a296c75a9dc0d2de86194b92ea7e4d 100644 (file)
--- a/gdb/nios2-linux-tdep.c
+++ b/gdb/nios2-linux-tdep.c
@@ -1,5 +1,5 @@
 /* Target-dependent code for GNU/Linux on Nios II.
-   Copyright (C) 2012-2018 Free Software Foundation, Inc.
+   Copyright (C) 2012-2022 Free Software Foundation, Inc.
    Contributed by Mentor Graphics, Inc.
 
    This file is part of GDB.
@@ -29,6 +29,7 @@
 #include "linux-tdep.h"
 #include "glibc-tdep.h"
 #include "nios2-tdep.h"
+#include "gdbarch.h"
 
 /* Core file and register set support.  */
 
@@ -200,24 +201,35 @@ nios2_linux_syscall_next_pc (struct frame_info *frame,
   return pc + op->size;
 }
 
+/* Return true if PC is a kernel helper, a function mapped by the kernel
+   into user space on an unwritable page.  Currently the only such function
+   is __kuser_cmpxchg at 0x1004.  See arch/nios2/kernel/entry.S in the Linux
+   kernel sources and sysdeps/unix/sysv/linux/nios2/atomic-machine.h in
+   GLIBC.  */
+static bool
+nios2_linux_is_kernel_helper (CORE_ADDR pc)
+{
+  return pc == 0x1004;
+}
+
 /* Hook function for gdbarch_register_osabi.  */
 
 static void
 nios2_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {
-  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+  nios2_gdbarch_tdep *tdep = (nios2_gdbarch_tdep *) gdbarch_tdep (gdbarch);
 
-  linux_init_abi (info, gdbarch);
+  linux_init_abi (info, gdbarch, 0);
 
   /* Shared library handling.  */
   set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
   set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver);
 
   set_solib_svr4_fetch_link_map_offsets (gdbarch,
-                                        svr4_ilp32_fetch_link_map_offsets);
+                                        linux_ilp32_fetch_link_map_offsets);
   /* Enable TLS support.  */
   set_gdbarch_fetch_tls_load_module_address (gdbarch,
-                                             svr4_fetch_objfile_link_map);
+                                            svr4_fetch_objfile_link_map);
   /* Core file support.  */
   set_gdbarch_iterate_over_regset_sections
     (gdbarch, nios2_iterate_over_regset_sections);
@@ -230,13 +242,15 @@ nios2_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
                                  &nios2_r1_linux_rt_sigreturn_tramp_frame);
 
   tdep->syscall_next_pc = nios2_linux_syscall_next_pc;
+  tdep->is_kernel_helper = nios2_linux_is_kernel_helper;
 
   /* Index of target address word in glibc jmp_buf.  */
   tdep->jb_pc = 10;
 }
 
+void _initialize_nios2_linux_tdep ();
 void
-_initialize_nios2_linux_tdep (void)
+_initialize_nios2_linux_tdep ()
 {
 
   const struct bfd_arch_info *arch_info;