1 /* Target-dependent code for NetBSD/sparc64.
3 Copyright 2002, 2003, 2004 Free Software Foundation, Inc.
4 Based on code contributed by Wasabi Systems, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
25 #include "frame-unwind.h"
31 #include "solib-svr4.h"
32 #include "trad-frame.h"
34 #include "gdb_assert.h"
35 #include "gdb_string.h"
37 #include "sparc64-tdep.h"
38 #include "nbsd-tdep.h"
40 /* From <machine/reg.h>. */
41 const struct sparc_gregset sparc64nbsd_gregset =
56 sparc64nbsd_supply_gregset (const struct regset *regset,
57 struct regcache *regcache,
58 int regnum, const void *gregs, size_t len)
60 sparc64_supply_gregset (regset->descr, regcache, regnum, gregs);
64 sparc64nbsd_supply_fpregset (const struct regset *regset,
65 struct regcache *regcache,
66 int regnum, const void *fpregs, size_t len)
68 sparc64_supply_fpregset (regcache, regnum, fpregs);
72 /* Signal trampolines. */
74 /* The following variables describe the location of an on-stack signal
75 trampoline. The current values correspond to the memory layout for
76 NetBSD 1.3 and up. These shouldn't be necessary for NetBSD 2.0 and
77 up, since NetBSD uses signal trampolines provided by libc now. */
79 static const CORE_ADDR sparc64nbsd_sigtramp_start = 0xffffffffffffdee4ULL;
80 static const CORE_ADDR sparc64nbsd_sigtramp_end = 0xffffffffffffe000ULL;
83 sparc64nbsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
85 if (pc >= sparc64nbsd_sigtramp_start && pc < sparc64nbsd_sigtramp_end)
88 return nbsd_pc_in_sigtramp (pc, name);
91 static struct sparc_frame_cache *
92 sparc64nbsd_sigcontext_frame_cache (struct frame_info *next_frame,
95 struct sparc_frame_cache *cache;
96 CORE_ADDR addr, sigcontext_addr, sp;
103 cache = sparc_frame_cache (next_frame, this_cache);
104 gdb_assert (cache == *this_cache);
106 /* The registers are saved in bits and pieces scattered all over the
107 place. The code below records their location on the assumption
108 that the part of the signal trampoline that saves the state has
111 /* If we couldn't find the frame's function, we're probably dealing
112 with an on-stack signal trampoline. */
115 cache->pc = sparc64nbsd_sigtramp_start;
117 /* Since we couldn't find the frame's function, the cache was
118 initialized under the assumption that we're frameless. */
119 cache->frameless_p = 0;
120 addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM);
124 cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
126 /* We find the appropriate instance of `struct sigcontext' at a
127 fixed offset in the signal frame. */
128 sigcontext_addr = cache->base + BIAS + 128 + 8;
130 cache->saved_regs[SPARC_SP_REGNUM].addr = sigcontext_addr + 8;
131 cache->saved_regs[SPARC64_PC_REGNUM].addr = sigcontext_addr + 16;
132 cache->saved_regs[SPARC64_NPC_REGNUM].addr = sigcontext_addr + 24;
133 cache->saved_regs[SPARC64_STATE_REGNUM].addr = sigcontext_addr + 32;
134 cache->saved_regs[SPARC_G1_REGNUM].addr = sigcontext_addr + 40;
135 cache->saved_regs[SPARC_O0_REGNUM].addr = sigcontext_addr + 48;
137 /* The remaining `global' registers and %y are saved in the `local'
139 delta = SPARC_L0_REGNUM - SPARC_G0_REGNUM;
140 for (regnum = SPARC_G2_REGNUM; regnum <= SPARC_G7_REGNUM; regnum++)
141 cache->saved_regs[regnum].realreg = regnum + delta;
142 cache->saved_regs[SPARC64_Y_REGNUM].realreg = SPARC_L1_REGNUM;
144 /* The remaining `out' registers can be found in the current frame's
146 delta = SPARC_I0_REGNUM - SPARC_O0_REGNUM;
147 for (regnum = SPARC_O1_REGNUM; regnum <= SPARC_O5_REGNUM; regnum++)
148 cache->saved_regs[regnum].realreg = regnum + delta;
149 cache->saved_regs[SPARC_O7_REGNUM].realreg = SPARC_I7_REGNUM;
151 /* The `local' and `in' registers have been saved in the register
153 addr = cache->saved_regs[SPARC_SP_REGNUM].addr;
154 sp = get_frame_memory_unsigned (next_frame, addr, 8);
155 for (regnum = SPARC_L0_REGNUM, addr = sp + BIAS;
156 regnum <= SPARC_I7_REGNUM; regnum++, addr += 8)
157 cache->saved_regs[regnum].addr = addr;
159 /* TODO: Handle the floating-point registers. */
165 sparc64nbsd_sigcontext_frame_this_id (struct frame_info *next_frame,
167 struct frame_id *this_id)
169 struct sparc_frame_cache *cache =
170 sparc64nbsd_sigcontext_frame_cache (next_frame, this_cache);
172 (*this_id) = frame_id_build (cache->base, cache->pc);
176 sparc64nbsd_sigcontext_frame_prev_register (struct frame_info *next_frame,
178 int regnum, int *optimizedp,
179 enum lval_type *lvalp,
181 int *realnump, void *valuep)
183 struct sparc_frame_cache *cache =
184 sparc64nbsd_sigcontext_frame_cache (next_frame, this_cache);
186 trad_frame_prev_register (next_frame, cache->saved_regs, regnum,
187 optimizedp, lvalp, addrp, realnump, valuep);
190 static const struct frame_unwind sparc64nbsd_sigcontext_frame_unwind =
193 sparc64nbsd_sigcontext_frame_this_id,
194 sparc64nbsd_sigcontext_frame_prev_register
197 static const struct frame_unwind *
198 sparc64nbsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
200 CORE_ADDR pc = frame_pc_unwind (next_frame);
203 find_pc_partial_function (pc, &name, NULL, NULL);
204 if (sparc64nbsd_pc_in_sigtramp (pc, name))
206 if (name == NULL || strncmp (name, "__sigtramp_sigcontext", 21))
207 return &sparc64nbsd_sigcontext_frame_unwind;
215 sparc64nbsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
217 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
219 tdep->gregset = XMALLOC (struct regset);
220 tdep->gregset->descr = &sparc64nbsd_gregset;
221 tdep->gregset->supply_regset = sparc64nbsd_supply_gregset;
222 tdep->sizeof_gregset = 160;
224 tdep->fpregset = XMALLOC (struct regset);
225 tdep->fpregset->supply_regset = sparc64nbsd_supply_fpregset;
226 tdep->sizeof_fpregset = 272;
228 set_gdbarch_pc_in_sigtramp (gdbarch, sparc64nbsd_pc_in_sigtramp);
229 frame_unwind_append_sniffer (gdbarch, sparc64nbsd_sigtramp_frame_sniffer);
231 sparc64_init_abi (info, gdbarch);
233 set_solib_svr4_fetch_link_map_offsets
234 (gdbarch, nbsd_lp64_solib_svr4_fetch_link_map_offsets);
238 /* Provide a prototype to silence -Wmissing-prototypes. */
239 void _initialize_sparc64nbsd_tdep (void);
242 _initialize_sparc64nbsd_tdep (void)
244 gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
245 GDB_OSABI_NETBSD_ELF, sparc64nbsd_init_abi);
246 gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
247 GDB_OSABI_OPENBSD_ELF, sparc64nbsd_init_abi);