1 /* Target-dependent code for GNU/Linux UltraSPARC.
3 Copyright (C) 2003, 2004, 2005, 2007, 2008 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 3 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, see <http://www.gnu.org/licenses/>. */
22 #include "frame-unwind.h"
23 #include "dwarf2-frame.h"
29 #include "solib-svr4.h"
31 #include "trad-frame.h"
32 #include "tramp-frame.h"
34 #include "sparc64-tdep.h"
36 /* Signal trampoline support. */
38 static void sparc64_linux_sigframe_init (const struct tramp_frame *self,
39 struct frame_info *next_frame,
40 struct trad_frame_cache *this_cache,
43 /* See sparc-linux-tdep.c for details. Note that 64-bit binaries only
46 static const struct tramp_frame sparc64_linux_rt_sigframe =
51 { 0x82102065, -1 }, /* mov __NR_rt_sigreturn, %g1 */
52 { 0x91d0206d, -1 }, /* ta 0x6d */
53 { TRAMP_SENTINEL_INSN, -1 }
55 sparc64_linux_sigframe_init
59 sparc64_linux_sigframe_init (const struct tramp_frame *self,
60 struct frame_info *next_frame,
61 struct trad_frame_cache *this_cache,
64 CORE_ADDR base, addr, sp_addr;
67 base = frame_unwind_register_unsigned (next_frame, SPARC_O1_REGNUM);
70 /* Offsets from <bits/sigcontext.h>. */
72 /* Since %g0 is always zero, keep the identity encoding. */
74 sp_addr = base + ((SPARC_SP_REGNUM - SPARC_G0_REGNUM) * 8);
75 for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++)
77 trad_frame_set_reg_addr (this_cache, regnum, addr);
81 trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0);
82 trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM, addr + 8);
83 trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM, addr + 16);
84 trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 24);
85 trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 28);
87 base = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
91 addr = get_frame_memory_unsigned (next_frame, sp_addr, 8);
95 for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
97 trad_frame_set_reg_addr (this_cache, regnum, addr);
100 trad_frame_set_id (this_cache, frame_id_build (base, func));
103 /* Return the address of a system call's alternative return
107 sparc64_linux_step_trap (struct frame_info *frame, unsigned long insn)
109 if (insn == 0x91d0206d)
111 ULONGEST sp = get_frame_register_unsigned (frame, SPARC_SP_REGNUM);
115 /* The kernel puts the sigreturn registers on the stack,
116 and this is where the signal unwinding state is take from
117 when returning from a signal.
119 A siginfo_t sits 192 bytes from the base of the stack. This
120 siginfo_t is 128 bytes, and is followed by the sigreturn
121 register save area. The saved PC sits at a 136 byte offset
124 return read_memory_unsigned_integer (sp + 192 + 128 + 136, 8);
131 const struct sparc_gregset sparc64_linux_core_gregset =
133 32 * 8, /* %tstate */
146 sparc64_linux_supply_core_gregset (const struct regset *regset,
147 struct regcache *regcache,
148 int regnum, const void *gregs, size_t len)
150 sparc64_supply_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs);
154 sparc64_linux_collect_core_gregset (const struct regset *regset,
155 const struct regcache *regcache,
156 int regnum, void *gregs, size_t len)
158 sparc64_collect_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs);
162 sparc64_linux_supply_core_fpregset (const struct regset *regset,
163 struct regcache *regcache,
164 int regnum, const void *fpregs, size_t len)
166 sparc64_supply_fpregset (regcache, regnum, fpregs);
170 sparc64_linux_collect_core_fpregset (const struct regset *regset,
171 const struct regcache *regcache,
172 int regnum, void *fpregs, size_t len)
174 sparc64_collect_fpregset (regcache, regnum, fpregs);
180 sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
182 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
184 tdep->gregset = regset_alloc (gdbarch, sparc64_linux_supply_core_gregset,
185 sparc64_linux_collect_core_gregset);
186 tdep->sizeof_gregset = 288;
188 tdep->fpregset = regset_alloc (gdbarch, sparc64_linux_supply_core_fpregset,
189 sparc64_linux_collect_core_fpregset);
190 tdep->sizeof_fpregset = 280;
192 tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe);
194 /* Hook in the DWARF CFI frame unwinder. */
195 frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
197 sparc64_init_abi (info, gdbarch);
199 /* GNU/Linux has SVR4-style shared libraries... */
200 set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
201 set_solib_svr4_fetch_link_map_offsets
202 (gdbarch, svr4_lp64_fetch_link_map_offsets);
204 /* ...which means that we need some special handling when doing
205 prologue analysis. */
206 tdep->plt_entry_size = 16;
208 /* Enable TLS support. */
209 set_gdbarch_fetch_tls_load_module_address (gdbarch,
210 svr4_fetch_objfile_link_map);
212 /* Make sure we can single-step over signal return system calls. */
213 tdep->step_trap = sparc64_linux_step_trap;
217 /* Provide a prototype to silence -Wmissing-prototypes. */
218 extern void _initialize_sparc64_linux_tdep (void);
221 _initialize_sparc64_linux_tdep (void)
223 gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
224 GDB_OSABI_LINUX, sparc64_linux_init_abi);