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Diffstat (limited to 'gdb/sparc64obsd-tdep.c')
| -rw-r--r-- | gdb/sparc64obsd-tdep.c | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/gdb/sparc64obsd-tdep.c b/gdb/sparc64obsd-tdep.c new file mode 100644 index 0000000..190a46b --- /dev/null +++ b/gdb/sparc64obsd-tdep.c @@ -0,0 +1,210 @@ +/* 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); +} |