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Diffstat (limited to 'gdb/sparc64nbsd-tdep.c')
| -rw-r--r-- | gdb/sparc64nbsd-tdep.c | 256 |
1 files changed, 256 insertions, 0 deletions
diff --git a/gdb/sparc64nbsd-tdep.c b/gdb/sparc64nbsd-tdep.c new file mode 100644 index 00000000000..8e7987008e7 --- /dev/null +++ b/gdb/sparc64nbsd-tdep.c @@ -0,0 +1,256 @@ +/* Target-dependent code for NetBSD/sparc64. + + Copyright 2002, 2003, 2004 Free Software Foundation, Inc. + Based on code contributed by Wasabi Systems, 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 "gdbcore.h" +#include "osabi.h" +#include "regcache.h" +#include "regset.h" +#include "symtab.h" +#include "solib-svr4.h" +#include "trad-frame.h" + +#include "gdb_assert.h" +#include "gdb_string.h" + +#include "sparc64-tdep.h" +#include "nbsd-tdep.h" + +/* From <machine/reg.h>. */ +const struct sparc_gregset sparc64nbsd_gregset = +{ + 0 * 8, /* "tstate" */ + 1 * 8, /* %pc */ + 2 * 8, /* %npc */ + 3 * 8, /* %y */ + -1, /* %fprs */ + -1, + 5 * 8, /* %g1 */ + -1, /* %l0 */ + 4 /* sizeof (%y) */ +}; + + +static void +sparc64nbsd_supply_gregset (const struct regset *regset, + struct regcache *regcache, + int regnum, const void *gregs, size_t len) +{ + sparc64_supply_gregset (regset->descr, regcache, regnum, gregs); +} + +static void +sparc64nbsd_supply_fpregset (const struct regset *regset, + struct regcache *regcache, + int regnum, const void *fpregs, size_t len) +{ + sparc64_supply_fpregset (regcache, regnum, fpregs); +} + + +/* Signal trampolines. */ + +/* The following variables describe the location of an on-stack signal + trampoline. The current values correspond to the memory layout for + NetBSD 1.3 and up. These shouldn't be necessary for NetBSD 2.0 and + up, since NetBSD uses signal trampolines provided by libc now. */ + +static const CORE_ADDR sparc64nbsd_sigtramp_start = 0xffffffffffffdee4ULL; +static const CORE_ADDR sparc64nbsd_sigtramp_end = 0xffffffffffffe000ULL; + +static int +sparc64nbsd_pc_in_sigtramp (CORE_ADDR pc, char *name) +{ + if (pc >= sparc64nbsd_sigtramp_start && pc < sparc64nbsd_sigtramp_end) + return 1; + + return nbsd_pc_in_sigtramp (pc, name); +} + +struct trad_frame_saved_reg * +sparc64nbsd_sigcontext_saved_regs (CORE_ADDR sigcontext_addr, + struct frame_info *next_frame) +{ + struct trad_frame_saved_reg *saved_regs; + CORE_ADDR addr, sp; + int regnum, delta; + + saved_regs = trad_frame_alloc_saved_regs (next_frame); + + /* The registers are saved in bits and pieces scattered all over the + place. The code below records their location on the assumption + that the part of the signal trampoline that saves the state has + been executed. */ + + saved_regs[SPARC_SP_REGNUM].addr = sigcontext_addr + 8; + saved_regs[SPARC64_PC_REGNUM].addr = sigcontext_addr + 16; + saved_regs[SPARC64_NPC_REGNUM].addr = sigcontext_addr + 24; + saved_regs[SPARC64_STATE_REGNUM].addr = sigcontext_addr + 32; + saved_regs[SPARC_G1_REGNUM].addr = sigcontext_addr + 40; + saved_regs[SPARC_O0_REGNUM].addr = sigcontext_addr + 48; + + /* The remaining `global' registers and %y are saved in the `local' + registers. */ + delta = SPARC_L0_REGNUM - SPARC_G0_REGNUM; + for (regnum = SPARC_G2_REGNUM; regnum <= SPARC_G7_REGNUM; regnum++) + saved_regs[regnum].realreg = regnum + delta; + saved_regs[SPARC64_Y_REGNUM].realreg = SPARC_L1_REGNUM; + + /* The remaining `out' registers can be found in the current frame's + `in' registers. */ + delta = SPARC_I0_REGNUM - SPARC_O0_REGNUM; + for (regnum = SPARC_O1_REGNUM; regnum <= SPARC_O5_REGNUM; regnum++) + saved_regs[regnum].realreg = regnum + delta; + saved_regs[SPARC_O7_REGNUM].realreg = SPARC_I7_REGNUM; + + /* The `local' and `in' registers have been saved in the register + save area. */ + addr = saved_regs[SPARC_SP_REGNUM].addr; + sp = get_frame_memory_unsigned (next_frame, addr, 8); + for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS; + regnum <= SPARC_I7_REGNUM; regnum++, addr += 8) + saved_regs[regnum].addr = addr; + + /* TODO: Handle the floating-point registers. */ + + return saved_regs; +} + +static struct sparc_frame_cache * +sparc64nbsd_sigcontext_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 = sparc64nbsd_sigtramp_start; + + /* 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 + 8; + cache->saved_regs = sparc64nbsd_sigcontext_saved_regs (addr, next_frame); + + return cache; +} + +static void +sparc64nbsd_sigcontext_frame_this_id (struct frame_info *next_frame, + void **this_cache, + struct frame_id *this_id) +{ + struct sparc_frame_cache *cache = + sparc64nbsd_sigcontext_frame_cache (next_frame, this_cache); + + (*this_id) = frame_id_build (cache->base, cache->pc); +} + +static void +sparc64nbsd_sigcontext_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 = + sparc64nbsd_sigcontext_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 sparc64nbsd_sigcontext_frame_unwind = +{ + SIGTRAMP_FRAME, + sparc64nbsd_sigcontext_frame_this_id, + sparc64nbsd_sigcontext_frame_prev_register +}; + +static const struct frame_unwind * +sparc64nbsd_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 (sparc64nbsd_pc_in_sigtramp (pc, name)) + { + if (name == NULL || strncmp (name, "__sigtramp_sigcontext", 21)) + return &sparc64nbsd_sigcontext_frame_unwind; + } + + return NULL; +} + + +static void +sparc64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) +{ + struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); + + tdep->gregset = XMALLOC (struct regset); + tdep->gregset->descr = &sparc64nbsd_gregset; + tdep->gregset->supply_regset = sparc64nbsd_supply_gregset; + tdep->sizeof_gregset = 160; + + tdep->fpregset = XMALLOC (struct regset); + tdep->fpregset->supply_regset = sparc64nbsd_supply_fpregset; + tdep->sizeof_fpregset = 272; + + set_gdbarch_pc_in_sigtramp (gdbarch, sparc64nbsd_pc_in_sigtramp); + frame_unwind_append_sniffer (gdbarch, sparc64nbsd_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_sparc64nbsd_tdep (void); + +void +_initialize_sparc64nbsd_tdep (void) +{ + gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9, + GDB_OSABI_NETBSD_ELF, sparc64nbsd_init_abi); +} |