ALLDEPFILES = \
aix-thread.c \
- alpha-nat.c alphabsd-nat.c alpha-linux-nat.c linux-fork.c \
- alpha-tdep.c alpha-linux-tdep.c alphabsd-tdep.c alphanbsd-tdep.c \
- alpha-osf1-tdep.c alphafbsd-tdep.c alpha-mdebug-tdep.c \
+ alpha-nat.c alphabsd-nat.c alpha-linux-nat.c \
+ alpha-tdep.c alpha-mdebug-tdep.c \
+ alpha-linux-tdep.c alpha-osf1-tdep.c \
+ alphabsd-tdep.c alphafbsd-tdep.c alphanbsd-tdep.c alphaobsd-tdep.c \
amd64-nat.c amd64-tdep.c \
amd64bsd-nat.c amd64fbsd-nat.c amd64fbsd-tdep.c \
amd64nbsd-nat.c amd64nbsd-tdep.c \
inf-ptrace.c inf-ttrace.c \
infptrace.c inftarg.c irix5-nat.c \
libunwind-frame.c \
+ linux-fork.c \
lynx-nat.c \
m68hc11-tdep.c \
m32r-tdep.c \
$(regcache_h) $(regset_h) $(value_h) $(osabi_h) $(gdb_string_h) \
$(gdb_assert_h) $(alpha_tdep_h) $(alphabsd_tdep_h) $(nbsd_tdep_h) \
$(solib_svr4_h)
+alphaobsd-tdep.o: alphaobsd-tdep.c $(defs_h) $(frame_h) $(gdbcore_h) \
+ $(osabi_h) $(alpha_tdep_h) $(alphabsd_tdep_h) $(solib_svr4_h)
alpha-osf1-tdep.o: alpha-osf1-tdep.c $(defs_h) $(frame_h) $(gdbcore_h) \
$(value_h) $(osabi_h) $(gdb_string_h) $(objfiles_h) $(alpha_tdep_h)
alpha-tdep.o: alpha-tdep.c $(defs_h) $(doublest_h) $(frame_h) \
--- /dev/null
+/* Target-dependent code for OpenBSD/alpha.
+
+ Copyright (C) 2006 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
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ 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. */
+
+#include "defs.h"
+#include "frame.h"
+#include "gdbcore.h"
+#include "osabi.h"
+
+#include "alpha-tdep.h"
+#include "alphabsd-tdep.h"
+#include "solib-svr4.h"
+
+/* Signal trampolines. */
+
+/* The OpenBSD kernel maps the signal trampoline at some random
+ location in user space, which means that the traditional BSD way of
+ detecting it won't work.
+
+ The signal trampoline will be mapped at an address that is page
+ aligned. We recognize the signal trampoline by looking for the
+ sigreturn system call. */
+
+static const int alphaobsd_page_size = 8192;
+
+static LONGEST
+alphaobsd_sigtramp_offset (CORE_ADDR pc)
+{
+ return (pc & (alphaobsd_page_size - 1));
+}
+
+static int
+alphaobsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
+{
+ CORE_ADDR start_pc = (pc & ~(alphaobsd_page_size - 1));
+ unsigned insn;
+
+ if (name)
+ return 0;
+
+ /* Check for "". */
+ insn = alpha_read_insn (start_pc + 5 * ALPHA_INSN_SIZE);
+ if (insn != 0x201f0067)
+ return 0;
+
+ /* Check for "". */
+ insn = alpha_read_insn (start_pc + 6 * ALPHA_INSN_SIZE);
+ if (insn != 0x00000083)
+ return 0;
+
+ return 1;
+}
+
+static CORE_ADDR
+alphaobsd_sigcontext_addr (struct frame_info *next_frame)
+{
+ CORE_ADDR pc = frame_pc_unwind (next_frame);
+
+ if (alphaobsd_sigtramp_offset (pc) < 3 * ALPHA_INSN_SIZE)
+ {
+ /* On entry, a pointer the `struct sigcontext' is passed in %a2. */
+ return frame_unwind_register_unsigned (next_frame, ALPHA_A0_REGNUM + 2);
+ }
+ else if (alphaobsd_sigtramp_offset (pc) < 4 * ALPHA_INSN_SIZE)
+ {
+ /* It is stored on the stack Before calling the signal handler. */
+ CORE_ADDR sp;
+ sp = frame_unwind_register_unsigned (next_frame, ALPHA_SP_REGNUM);
+ return get_frame_memory_unsigned (next_frame, sp, 8);
+ }
+ else
+ {
+ /* It is reloaded into %a0 for the sigreturn(2) call. */
+ return frame_unwind_register_unsigned (next_frame, ALPHA_A0_REGNUM);
+ }
+}
+\f
+
+static void
+alphaobsd_init_abi(struct gdbarch_info info, struct gdbarch *gdbarch)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
+
+ /* Hook into the DWARF CFI frame unwinder. */
+ alpha_dwarf2_init_abi (info, gdbarch);
+
+ /* Hook into the MDEBUG frame unwinder. */
+ alpha_mdebug_init_abi (info, gdbarch);
+
+ /* OpenBSD/alpha 3.0 and earlier does not provide single step
+ support via ptrace(2); use software single-stepping for now. */
+ set_gdbarch_software_single_step (gdbarch, alpha_software_single_step);
+
+ /* OpenBSD/alpha has SVR4-style shared libraries. */
+ set_solib_svr4_fetch_link_map_offsets
+ (gdbarch, svr4_lp64_fetch_link_map_offsets);
+
+ tdep->dynamic_sigtramp_offset = alphaobsd_sigtramp_offset;
+ tdep->pc_in_sigtramp = alphaobsd_pc_in_sigtramp;
+ tdep->sigcontext_addr = alphaobsd_sigcontext_addr;
+
+ tdep->jb_pc = 2;
+ tdep->jb_elt_size = 8;
+
+ set_gdbarch_regset_from_core_section
+ (gdbarch, alphanbsd_regset_from_core_section);
+}
+\f
+
+/* Provide a prototype to silence -Wmissing-prototypes. */
+void _initialize_alphaobsd_tdep (void);
+
+void
+_initialize_alphaobsd_tdep (void)
+{
+ gdbarch_register_osabi (bfd_arch_alpha, 0, GDB_OSABI_OPENBSD_ELF,
+ alphaobsd_init_abi);
+}
projects / binutils-gdb.git / commitdiff