testsuite: Fix recent GCC FAIL: gdb.arch/i386-signal.exp

[deliverable/binutils-gdb.git] / gdb / armobsd-tdep.c

diff --git a/gdb/armobsd-tdep.c b/gdb/armobsd-tdep.c
index 64c83384e93514e656a4128a3fae76f9942990a4..5ccf1d146d1283a5a8ec74a4fdb626b95e53ecfc 100644 (file)
--- a/gdb/armobsd-tdep.c
+++ b/gdb/armobsd-tdep.c
@@ -1,12 +1,12 @@
 /* Target-dependent code for OpenBSD/arm.
 
-   Copyright (C) 2006 Free Software Foundation, Inc.
+   Copyright (C) 2006-2016 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2 of the License, or
+   the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
@@ -15,17 +15,63 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin Street, Fifth Floor,
-   Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 #include "defs.h"
 #include "osabi.h"
+#include "trad-frame.h"
+#include "tramp-frame.h"
 
 #include "obsd-tdep.h"
 #include "arm-tdep.h"
 #include "solib-svr4.h"
 
+/* Signal trampolines.  */
+
+static void
+armobsd_sigframe_init (const struct tramp_frame *self,
+                      struct frame_info *this_frame,
+                      struct trad_frame_cache *cache,
+                      CORE_ADDR func)
+{
+  CORE_ADDR sp, sigcontext_addr, addr;
+  int regnum;
+
+  /* We find the appropriate instance of `struct sigcontext' at a
+     fixed offset in the signal frame.  */
+  sp = get_frame_register_signed (this_frame, ARM_SP_REGNUM);
+  sigcontext_addr = sp + 16;
+
+  /* PC.  */
+  trad_frame_set_reg_addr (cache, ARM_PC_REGNUM, sigcontext_addr + 76);
+
+  /* GPRs.  */
+  for (regnum = ARM_A1_REGNUM, addr = sigcontext_addr + 12;
+       regnum <= ARM_LR_REGNUM; regnum++, addr += 4)
+    trad_frame_set_reg_addr (cache, regnum, addr);
+
+  trad_frame_set_id (cache, frame_id_build (sp, func));
+}
+
+static const struct tramp_frame armobsd_sigframe =
+{
+  SIGTRAMP_FRAME,
+  4,
+  {
+    { 0xe28d0010, -1 },                /* add     r0, sp, #16 */
+    { 0xef000067, -1 },                /* swi     SYS_sigreturn */
+    { 0xef000001, -1 },                /* swi     SYS_exit */
+    { 0xeafffffc, -1 },                /* b       . - 8 */
+    { TRAMP_SENTINEL_INSN, -1 }
+  },
+  armobsd_sigframe_init
+};
+\f
+
+/* Override default thumb breakpoints.  */
+static const gdb_byte arm_obsd_thumb_le_breakpoint[] = {0xfe, 0xdf};
+static const gdb_byte arm_obsd_thumb_be_breakpoint[] = {0xdf, 0xfe};
+
 static void
 armobsd_init_abi (struct gdbarch_info info,
                  struct gdbarch *gdbarch)
@@ -35,6 +81,8 @@ armobsd_init_abi (struct gdbarch_info info,
   if (tdep->fp_model == ARM_FLOAT_AUTO)
     tdep->fp_model = ARM_FLOAT_SOFT_VFP;
 
+  tramp_frame_prepend_unwinder (gdbarch, &armobsd_sigframe);
+
   /* OpenBSD/arm uses SVR4-style shared libraries.  */
   set_solib_svr4_fetch_link_map_offsets
     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
@@ -42,11 +90,51 @@ armobsd_init_abi (struct gdbarch_info info,
 
   tdep->jb_pc = 24;
   tdep->jb_elt_size = 4;
+
+  set_gdbarch_iterate_over_regset_sections
+    (gdbarch, armbsd_iterate_over_regset_sections);
+
+  /* OpenBSD/arm uses -fpcc-struct-return by default.  */
+  tdep->struct_return = pcc_struct_return;
+
+  /* Single stepping.  */
+  set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
+
+  /* Breakpoints.  */
+  switch (info.byte_order)
+    {
+    case BFD_ENDIAN_BIG:
+      tdep->thumb_breakpoint = arm_obsd_thumb_be_breakpoint;
+      tdep->thumb_breakpoint_size = sizeof (arm_obsd_thumb_be_breakpoint);
+      break;
+
+    case BFD_ENDIAN_LITTLE:
+      tdep->thumb_breakpoint = arm_obsd_thumb_le_breakpoint;
+      tdep->thumb_breakpoint_size = sizeof (arm_obsd_thumb_le_breakpoint);
+      break;
+    }
 }
+\f
+
+static enum gdb_osabi
+armobsd_core_osabi_sniffer (bfd *abfd)
+{
+  if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0)
+    return GDB_OSABI_OPENBSD_ELF;
+
+  return GDB_OSABI_UNKNOWN;
+}
+
+/* Provide a prototype to silence -Wmissing-prototypes.  */
+extern initialize_file_ftype _initialize_armobsd_tdep;
 
 void
 _initialize_armobsd_tdep (void)
 {
+  /* BFD doesn't set a flavour for NetBSD style a.out core files.  */
+  gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_unknown_flavour,
+                                  armobsd_core_osabi_sniffer);
+
   gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_OPENBSD_ELF,
                          armobsd_init_abi);
 }