| /* Target-dependent code for OpenBSD/sparc64. |
| |
| Copyright 2004 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., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. */ |
| |
| #include "defs.h" |
| #include "frame.h" |
| #include "frame-unwind.h" |
| #include "osabi.h" |
| #include "regset.h" |
| #include "symtab.h" |
| #include "solib-svr4.h" |
| #include "trad-frame.h" |
| |
| #include "gdb_assert.h" |
| |
| #include "sparc64-tdep.h" |
| #include "nbsd-tdep.h" |
| |
| /* OpenBSD uses the traditional NetBSD core file format, even for |
| ports that use ELF. The core files don't use multiple register |
| sets. Instead, the general-purpose and floating-point registers |
| are lumped together in a single section. Unlike on NetBSD, OpenBSD |
| uses a different layout for its general-purpose registers than the |
| layout used for ptrace(2). */ |
| |
| /* From <machine/reg.h>. */ |
| const struct sparc_gregset sparc64obsd_core_gregset = |
| { |
| 0 * 8, /* "tstate" */ |
| 1 * 8, /* %pc */ |
| 2 * 8, /* %npc */ |
| 3 * 8, /* %y */ |
| -1, /* %fprs */ |
| -1, |
| 7 * 8, /* %g1 */ |
| 22 * 8, /* %l0 */ |
| 4 /* sizeof (%y) */ |
| }; |
| |
| static void |
| sparc64obsd_supply_gregset (const struct regset *regset, |
| struct regcache *regcache, |
| int regnum, const void *gregs, size_t len) |
| { |
| const char *regs = gregs; |
| |
| sparc64_supply_gregset (regset->descr, regcache, regnum, regs); |
| sparc64_supply_fpregset (regcache, regnum, regs + 288); |
| } |
| |
| |
| /* 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 the looking for the |
| sigreturn system call. */ |
| |
| static const int sparc64obsd_page_size = 8192; |
| |
| static int |
| sparc64obsd_pc_in_sigtramp (CORE_ADDR pc, char *name) |
| { |
| CORE_ADDR start_pc = (pc & ~(sparc64obsd_page_size - 1)); |
| unsigned long insn; |
| |
| if (name) |
| return 0; |
| |
| /* Check for "restore %g0, SYS_sigreturn, %g1". */ |
| insn = sparc_fetch_instruction (start_pc + 0xe8); |
| if (insn != 0x83e82067) |
| return 0; |
| |
| /* Check for "t ST_SYSCALL". */ |
| insn = sparc_fetch_instruction (start_pc + 0xf0); |
| if (insn != 0x91d02000) |
| return 0; |
| |
| return 1; |
| } |
| |
| static struct sparc_frame_cache * |
| sparc64obsd_frame_cache (struct frame_info *next_frame, void **this_cache) |
| { |
| struct sparc_frame_cache *cache; |
| CORE_ADDR addr; |
| |
| if (*this_cache) |
| return *this_cache; |
| |
| cache = sparc_frame_cache (next_frame, this_cache); |
| gdb_assert (cache == *this_cache); |
| |
| /* If we couldn't find the frame's function, we're probably dealing |
| with an on-stack signal trampoline. */ |
| if (cache->pc == 0) |
| { |
| cache->pc = frame_pc_unwind (next_frame); |
| cache->pc &= ~(sparc64obsd_page_size - 1); |
| |
| /* Since we couldn't find the frame's function, the cache was |
| initialized under the assumption that we're frameless. */ |
| cache->frameless_p = 0; |
| addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM); |
| cache->base = addr; |
| } |
| |
| /* We find the appropriate instance of `struct sigcontext' at a |
| fixed offset in the signal frame. */ |
| addr = cache->base + BIAS + 128 + 16; |
| cache->saved_regs = sparc64nbsd_sigcontext_saved_regs (addr, next_frame); |
| |
| return cache; |
| } |
| |
| static void |
| sparc64obsd_frame_this_id (struct frame_info *next_frame, void **this_cache, |
| struct frame_id *this_id) |
| { |
| struct sparc_frame_cache *cache = |
| sparc64obsd_frame_cache (next_frame, this_cache); |
| |
| (*this_id) = frame_id_build (cache->base, cache->pc); |
| } |
| |
| static void |
| sparc64obsd_frame_prev_register (struct frame_info *next_frame, |
| void **this_cache, |
| int regnum, int *optimizedp, |
| enum lval_type *lvalp, CORE_ADDR *addrp, |
| int *realnump, void *valuep) |
| { |
| struct sparc_frame_cache *cache = |
| sparc64obsd_frame_cache (next_frame, this_cache); |
| |
| trad_frame_prev_register (next_frame, cache->saved_regs, regnum, |
| optimizedp, lvalp, addrp, realnump, valuep); |
| } |
| |
| static const struct frame_unwind sparc64obsd_frame_unwind = |
| { |
| SIGTRAMP_FRAME, |
| sparc64obsd_frame_this_id, |
| sparc64obsd_frame_prev_register |
| }; |
| |
| static const struct frame_unwind * |
| sparc64obsd_sigtramp_frame_sniffer (struct frame_info *next_frame) |
| { |
| CORE_ADDR pc = frame_pc_unwind (next_frame); |
| char *name; |
| |
| find_pc_partial_function (pc, &name, NULL, NULL); |
| if (sparc64obsd_pc_in_sigtramp (pc, name)) |
| return &sparc64obsd_frame_unwind; |
| |
| return NULL; |
| } |
| |
| |
| static void |
| sparc64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) |
| { |
| struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
| |
| tdep->gregset = XMALLOC (struct regset); |
| tdep->gregset->descr = &sparc64obsd_core_gregset; |
| tdep->gregset->supply_regset = sparc64obsd_supply_gregset; |
| tdep->sizeof_gregset = 832; |
| |
| set_gdbarch_pc_in_sigtramp (gdbarch, sparc64obsd_pc_in_sigtramp); |
| frame_unwind_append_sniffer (gdbarch, sparc64obsd_sigtramp_frame_sniffer); |
| |
| sparc64_init_abi (info, gdbarch); |
| |
| set_solib_svr4_fetch_link_map_offsets |
| (gdbarch, nbsd_lp64_solib_svr4_fetch_link_map_offsets); |
| } |
| |
| |
| /* Provide a prototype to silence -Wmissing-prototypes. */ |
| void _initialize_sparc64obsd_tdep (void); |
| |
| void |
| _initialize_sparc64obsd_tdep (void) |
| { |
| gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9, |
| GDB_OSABI_OPENBSD_ELF, sparc64obsd_init_abi); |
| } |