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
);