1 /* Target-dependent code for GNU/Linux UltraSPARC.
3 Copyright (C) 2003, 2004, 2005, 2007 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"
25 #include "dwarf2-frame.h"
31 #include "solib-svr4.h"
33 #include "trad-frame.h"
34 #include "tramp-frame.h"
36 #include "sparc64-tdep.h"
38 /* Signal trampoline support. */
40 static void sparc64_linux_sigframe_init (const struct tramp_frame *self,
41 struct frame_info *next_frame,
42 struct trad_frame_cache *this_cache,
45 /* See sparc-linux-tdep.c for details. Note that 64-bit binaries only
48 static const struct tramp_frame sparc64_linux_rt_sigframe =
53 { 0x82102065, -1 }, /* mov __NR_rt_sigreturn, %g1 */
54 { 0x91d0206d, -1 }, /* ta 0x6d */
55 { TRAMP_SENTINEL_INSN, -1 }
57 sparc64_linux_sigframe_init
61 sparc64_linux_sigframe_init (const struct tramp_frame *self,
62 struct frame_info *next_frame,
63 struct trad_frame_cache *this_cache,
66 CORE_ADDR base, addr, sp_addr;
69 base = frame_unwind_register_unsigned (next_frame, SPARC_O1_REGNUM);
72 /* Offsets from <bits/sigcontext.h>. */
74 /* Since %g0 is always zero, keep the identity encoding. */
76 sp_addr = base + ((SPARC_SP_REGNUM - SPARC_G0_REGNUM) * 8);
77 for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++)
79 trad_frame_set_reg_addr (this_cache, regnum, addr);
83 trad_frame_set_reg_addr (this_cache, SPARC64_STATE_REGNUM, addr + 0);
84 trad_frame_set_reg_addr (this_cache, SPARC64_PC_REGNUM, addr + 8);
85 trad_frame_set_reg_addr (this_cache, SPARC64_NPC_REGNUM, addr + 16);
86 trad_frame_set_reg_addr (this_cache, SPARC64_Y_REGNUM, addr + 24);
87 trad_frame_set_reg_addr (this_cache, SPARC64_FPRS_REGNUM, addr + 28);
89 base = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
93 addr = get_frame_memory_unsigned (next_frame, sp_addr, 8);
97 for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
99 trad_frame_set_reg_addr (this_cache, regnum, addr);
102 trad_frame_set_id (this_cache, frame_id_build (base, func));
105 /* Return the address of a system call's alternative return
109 sparc64_linux_step_trap (struct frame_info *frame, unsigned long insn)
111 if (insn == 0x91d0206d)
113 ULONGEST sp = get_frame_register_unsigned (frame, SPARC_SP_REGNUM);
117 /* The kernel puts the sigreturn registers on the stack,
118 and this is where the signal unwinding state is take from
119 when returning from a signal.
121 A siginfo_t sits 192 bytes from the base of the stack. This
122 siginfo_t is 128 bytes, and is followed by the sigreturn
123 register save area. The saved PC sits at a 136 byte offset
126 return read_memory_unsigned_integer (sp + 192 + 128 + 136, 8);
133 const struct sparc_gregset sparc64_linux_core_gregset =
135 32 * 8, /* %tstate */
148 sparc64_linux_supply_core_gregset (const struct regset *regset,
149 struct regcache *regcache,
150 int regnum, const void *gregs, size_t len)
152 sparc64_supply_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs);
156 sparc64_linux_collect_core_gregset (const struct regset *regset,
157 const struct regcache *regcache,
158 int regnum, void *gregs, size_t len)
160 sparc64_collect_gregset (&sparc64_linux_core_gregset, regcache, regnum, gregs);
164 sparc64_linux_supply_core_fpregset (const struct regset *regset,
165 struct regcache *regcache,
166 int regnum, const void *fpregs, size_t len)
168 sparc64_supply_fpregset (regcache, regnum, fpregs);
172 sparc64_linux_collect_core_fpregset (const struct regset *regset,
173 const struct regcache *regcache,
174 int regnum, void *fpregs, size_t len)
176 sparc64_collect_fpregset (regcache, regnum, fpregs);
182 sparc64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
184 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
186 tdep->gregset = regset_alloc (gdbarch, sparc64_linux_supply_core_gregset,
187 sparc64_linux_collect_core_gregset);
188 tdep->sizeof_gregset = 288;
190 tdep->fpregset = regset_alloc (gdbarch, sparc64_linux_supply_core_fpregset,
191 sparc64_linux_collect_core_fpregset);
192 tdep->sizeof_fpregset = 280;
194 tramp_frame_prepend_unwinder (gdbarch, &sparc64_linux_rt_sigframe);
196 /* Hook in the DWARF CFI frame unwinder. */
197 frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer);
199 sparc64_init_abi (info, gdbarch);
201 /* GNU/Linux has SVR4-style shared libraries... */
202 set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
203 set_solib_svr4_fetch_link_map_offsets
204 (gdbarch, svr4_lp64_fetch_link_map_offsets);
206 /* ...which means that we need some special handling when doing
207 prologue analysis. */
208 tdep->plt_entry_size = 16;
210 /* Enable TLS support. */
211 set_gdbarch_fetch_tls_load_module_address (gdbarch,
212 svr4_fetch_objfile_link_map);
214 /* Make sure we can single-step over signal return system calls. */
215 tdep->step_trap = sparc64_linux_step_trap;
219 /* Provide a prototype to silence -Wmissing-prototypes. */
220 extern void _initialize_sparc64_linux_tdep (void);
223 _initialize_sparc64_linux_tdep (void)
225 gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
226 GDB_OSABI_LINUX, sparc64_linux_init_abi);