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
);