1 /* Target-dependent code for GNU/Linux UltraSPARC.
3 Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
24 #include "frame-unwind.h"
30 #include "solib-svr4.h"
32 #include "trad-frame.h"
33 #include "tramp-frame.h"
35 #include "sparc64-tdep.h"
37 /* Signal trampoline support. */
39 static void sparc64_linux_sigframe_init (const struct tramp_frame *self,
40 struct frame_info *next_frame,
41 struct trad_frame_cache *this_cache,
44 /* See sparc-linux-tdep.c for details. Note that 64-bit binaries only
47 static const struct tramp_frame sparc64_linux_rt_sigframe =
52 { 0x82102065, -1 }, /* mov __NR_rt_sigreturn, %g1 */
53 { 0x91d0206d, -1 }, /* ta 0x6d */
54 { TRAMP_SENTINEL_INSN, -1 }
56 sparc64_linux_sigframe_init
60 sparc64_linux_sigframe_init (const struct tramp_frame *self,
61 struct frame_info *next_frame,
62 struct trad_frame_cache *this_cache,
65 CORE_ADDR base, addr, sp_addr;
68 base = frame_unwind_register_unsigned (next_frame, SPARC_O1_REGNUM);
71 /* Offsets from <bits/sigcontext.h>. */
73 /* Since %g0 is always zero, keep the identity encoding. */
75 sp_addr = base + ((SPARC_SP_REGNUM - SPARC_G0_REGNUM) * 8);
76 for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++)
78 trad_frame_set_reg_addr (this_cache, regnum, addr);
82 trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0);
83 trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM, addr + 8);
84 trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM, addr + 16);
85 trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 24);
86 trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 28);
88 base = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
92 addr = get_frame_memory_unsigned (next_frame, sp_addr, 8);
96 for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
98 trad_frame_set_reg_addr (this_cache, regnum, addr);
101 trad_frame_set_id (this_cache, frame_id_build (base, func));
104 /* Return the address of a system call's alternative return
108 sparc64_linux_step_trap (unsigned long insn)
110 if (insn == 0x91d0206d)
114 regcache_cooked_read_unsigned (current_regcache,
115 SPARC_SP_REGNUM, &sp);
119 /* The kernel puts the sigreturn registers on the stack,
120 and this is where the signal unwinding state is take from
121 when returning from a signal.
123 A siginfo_t sits 192 bytes from the base of the stack. This
124 siginfo_t is 128 bytes, and is followed by the sigreturn
125 register save area. The saved PC sits at a 136 byte offset
128 return read_memory_unsigned_integer (sp + 192 + 128 + 136, 8);
135 const struct sparc_gregset sparc64_linux_core_gregset =
137 32 * 8, /* %tstate */
150 sparc64_linux_supply_core_gregset (const struct regset *regset,
151 struct regcache *regcache,
152 int regnum, const void *gregs, size_t len)
154 sparc64_supply_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs);
158 sparc64_linux_collect_core_gregset (const struct regset *regset,
159 const struct regcache *regcache,
160 int regnum, void *gregs, size_t len)
162 sparc64_collect_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs);
166 sparc64_linux_supply_core_fpregset (const struct regset *regset,
167 struct regcache *regcache,
168 int regnum, const void *fpregs, size_t len)
170 sparc64_supply_fpregset (regcache, regnum, fpregs);
174 sparc64_linux_collect_core_fpregset (const struct regset *regset,
175 const struct regcache *regcache,
176 int regnum, void *fpregs, size_t len)
178 sparc64_collect_fpregset (regcache, regnum, fpregs);
184 sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
186 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
188 tdep->gregset = regset_alloc (gdbarch, sparc64_linux_supply_core_gregset,
189 sparc64_linux_collect_core_gregset);
190 tdep->sizeof_gregset = 288;
192 tdep->fpregset = regset_alloc (gdbarch, sparc64_linux_supply_core_fpregset,
193 sparc64_linux_collect_core_fpregset);
194 tdep->sizeof_fpregset = 280;
196 tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe);
198 sparc64_init_abi (info, gdbarch);
200 /* GNU/Linux has SVR4-style shared libraries... */
201 set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
202 set_solib_svr4_fetch_link_map_offsets
203 (gdbarch, svr4_lp64_fetch_link_map_offsets);
205 /* ...which means that we need some special handling when doing
206 prologue analysis. */
207 tdep->plt_entry_size = 16;
209 /* Enable TLS support. */
210 set_gdbarch_fetch_tls_load_module_address (gdbarch,
211 svr4_fetch_objfile_link_map);
213 /* Make sure we can single-step over signal return system calls. */
214 tdep->step_trap = sparc64_linux_step_trap;
218 /* Provide a prototype to silence -Wmissing-prototypes. */
219 extern void _initialize_sparc64_linux_tdep (void);
222 _initialize_sparc64_linux_tdep (void)
224 gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
225 GDB_OSABI_LINUX, sparc64_linux_init_abi);