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Diffstat (limited to 'gdb/vax-obsd-tdep.c')
| -rw-r--r-- | gdb/vax-obsd-tdep.c | 178 |
1 files changed, 0 insertions, 178 deletions
diff --git a/gdb/vax-obsd-tdep.c b/gdb/vax-obsd-tdep.c deleted file mode 100644 index ee48ac6..0000000 --- a/gdb/vax-obsd-tdep.c +++ /dev/null @@ -1,178 +0,0 @@ -/* Target-dependent code for OpenBSD/vax. - - Copyright (C) 2005-2016 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 3 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, see <http://www.gnu.org/licenses/>. */ - -#include "defs.h" -#include "arch-utils.h" -#include "frame.h" -#include "frame-unwind.h" -#include "osabi.h" -#include "symtab.h" -#include "trad-frame.h" - -#include "vax-tdep.h" - -/* Signal trampolines. */ - -/* Since OpenBSD 3.2, the sigtramp routine is mapped at a random page - in virtual memory. The randomness makes it somewhat tricky to - detect it, but fortunately we can rely on the fact that the start - of the sigtramp routine is page-aligned. We recognize the - trampoline by looking for the code that invokes the sigreturn - system call. The offset where we can find that code varies from - release to release. - - By the way, the mapping mentioned above is read-only, so you cannot - place a breakpoint in the signal trampoline. */ - -/* Default page size. */ -static const int vaxobsd_page_size = 4096; - -/* Offset for sigreturn(2). */ -static const int vaxobsd_sigreturn_offset = 0x11; - -/* Instruction sequence for sigreturn(2). VAX doesn't have - fixed-length instructions so we include the ensuing exit(2) to - reduce the chance of spurious matches. */ -static const gdb_byte vaxobsd_sigreturn[] = { - 0xbc, 0x8f, 0x67, 0x00, /* chmk $SYS_sigreturn */ - 0xbc, 0x01 /* chmk $SYS_exit */ -}; - -static int -vaxobsd_sigtramp_sniffer (const struct frame_unwind *self, - struct frame_info *this_frame, - void **this_cache) -{ - CORE_ADDR pc = get_frame_pc (this_frame); - CORE_ADDR start_pc = (pc & ~(vaxobsd_page_size - 1)); - CORE_ADDR sigreturn_addr = start_pc + vaxobsd_sigreturn_offset; - gdb_byte *buf; - const char *name; - - find_pc_partial_function (pc, &name, NULL, NULL); - if (name) - return 0; - - buf = (gdb_byte *) alloca (sizeof vaxobsd_sigreturn); - if (!safe_frame_unwind_memory (this_frame, sigreturn_addr, - buf, sizeof vaxobsd_sigreturn)) - return 0; - - if (memcmp(buf, vaxobsd_sigreturn, sizeof vaxobsd_sigreturn) == 0) - return 1; - - return 0; -} - -static struct trad_frame_cache * -vaxobsd_sigtramp_frame_cache (struct frame_info *this_frame, void **this_cache) -{ - struct trad_frame_cache *cache; - CORE_ADDR addr, base, func; - - if (*this_cache) - return (struct trad_frame_cache *) *this_cache; - - cache = trad_frame_cache_zalloc (this_frame); - *this_cache = cache; - - func = get_frame_pc (this_frame); - func &= ~(vaxobsd_page_size - 1); - - base = get_frame_register_unsigned (this_frame, VAX_SP_REGNUM); - addr = get_frame_memory_unsigned (this_frame, base - 4, 4); - - trad_frame_set_reg_addr (cache, VAX_SP_REGNUM, addr + 8); - trad_frame_set_reg_addr (cache, VAX_FP_REGNUM, addr + 12); - trad_frame_set_reg_addr (cache, VAX_AP_REGNUM, addr + 16); - trad_frame_set_reg_addr (cache, VAX_PC_REGNUM, addr + 20); - trad_frame_set_reg_addr (cache, VAX_PS_REGNUM, addr + 24); - - /* Construct the frame ID using the function start. */ - trad_frame_set_id (cache, frame_id_build (base, func)); - - return cache; -} - -static void -vaxobsd_sigtramp_frame_this_id (struct frame_info *this_frame, - void **this_cache, struct frame_id *this_id) -{ - struct trad_frame_cache *cache = - vaxobsd_sigtramp_frame_cache (this_frame, this_cache); - - trad_frame_get_id (cache, this_id); -} - -static struct value * -vaxobsd_sigtramp_frame_prev_register (struct frame_info *this_frame, - void **this_cache, int regnum) -{ - struct trad_frame_cache *cache = - vaxobsd_sigtramp_frame_cache (this_frame, this_cache); - - return trad_frame_get_register (cache, this_frame, regnum); -} - -static const struct frame_unwind vaxobsd_sigtramp_frame_unwind = { - SIGTRAMP_FRAME, - default_frame_unwind_stop_reason, - vaxobsd_sigtramp_frame_this_id, - vaxobsd_sigtramp_frame_prev_register, - NULL, - vaxobsd_sigtramp_sniffer -}; - - -/* OpenBSD a.out. */ - -static void -vaxobsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) -{ - frame_unwind_append_unwinder (gdbarch, &vaxobsd_sigtramp_frame_unwind); -} - -/* FIXME: kettenis/20050821: Since OpenBSD/vax binaries are - indistingushable from NetBSD/vax a.out binaries, building a GDB - that should support both these targets will probably not work as - expected. */ -#define GDB_OSABI_OPENBSD_AOUT GDB_OSABI_NETBSD_AOUT - -static enum gdb_osabi -vaxobsd_aout_osabi_sniffer (bfd *abfd) -{ - if (strcmp (bfd_get_target (abfd), "a.out-vax-netbsd") == 0) - return GDB_OSABI_OPENBSD_AOUT; - - return GDB_OSABI_UNKNOWN; -} - - -/* Provide a prototype to silence -Wmissing-prototypes. */ -void _initialize_vaxobsd_tdep (void); - -void -_initialize_vaxobsd_tdep (void) -{ - gdbarch_register_osabi_sniffer (bfd_arch_vax, bfd_target_aout_flavour, - vaxobsd_aout_osabi_sniffer); - - gdbarch_register_osabi (bfd_arch_vax, 0, GDB_OSABI_OPENBSD_AOUT, - vaxobsd_init_abi); -} |