1 /* Target-dependent code for Solaris SPARC.
3 Copyright (C) 2003-2014 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"
29 #include "trad-frame.h"
33 #include "sol2-tdep.h"
34 #include "sparc-tdep.h"
35 #include "solib-svr4.h"
37 /* From <sys/regset.h>. */
38 const struct sparc_gregmap sparc32_sol2_gregmap
=
50 const struct sparc_fpregmap sparc32_sol2_fpregmap
=
57 /* The Solaris signal trampolines reside in libc. For normal signals,
58 the function `sigacthandler' is used. This signal trampoline will
59 call the signal handler using the System V calling convention,
60 where the third argument is a pointer to an instance of
61 `ucontext_t', which has a member `uc_mcontext' that contains the
62 saved registers. Incidentally, the kernel passes the `ucontext_t'
63 pointer as the third argument of the signal trampoline too, and
64 `sigacthandler' simply passes it on. However, if you link your
65 program with "-L/usr/ucblib -R/usr/ucblib -lucb", the function
66 `ucbsigvechandler' will be used, which invokes the using the BSD
67 convention, where the third argument is a pointer to an instance of
68 `struct sigcontext'. It is the `ucbsigvechandler' function that
69 converts the `ucontext_t' to a `sigcontext', and back. Unless the
70 signal handler modifies the `struct sigcontext' we can safely
74 sparc_sol2_pc_in_sigtramp (CORE_ADDR pc
, const char *name
)
76 return (name
&& (strcmp (name
, "sigacthandler") == 0
77 || strcmp (name
, "ucbsigvechandler") == 0
78 || strcmp (name
, "__sighndlr") == 0));
81 static struct sparc_frame_cache
*
82 sparc32_sol2_sigtramp_frame_cache (struct frame_info
*this_frame
,
85 struct sparc_frame_cache
*cache
;
86 CORE_ADDR mcontext_addr
, addr
;
92 cache
= sparc_frame_cache (this_frame
, this_cache
);
93 gdb_assert (cache
== *this_cache
);
95 cache
->saved_regs
= trad_frame_alloc_saved_regs (this_frame
);
97 /* The third argument is a pointer to an instance of `ucontext_t',
98 which has a member `uc_mcontext' that contains the saved
101 (cache
->copied_regs_mask
& 0x04) ? SPARC_I2_REGNUM
: SPARC_O2_REGNUM
;
102 mcontext_addr
= get_frame_register_unsigned (this_frame
, regnum
) + 40;
104 cache
->saved_regs
[SPARC32_PSR_REGNUM
].addr
= mcontext_addr
+ 0 * 4;
105 cache
->saved_regs
[SPARC32_PC_REGNUM
].addr
= mcontext_addr
+ 1 * 4;
106 cache
->saved_regs
[SPARC32_NPC_REGNUM
].addr
= mcontext_addr
+ 2 * 4;
107 cache
->saved_regs
[SPARC32_Y_REGNUM
].addr
= mcontext_addr
+ 3 * 4;
109 /* Since %g0 is always zero, keep the identity encoding. */
110 for (regnum
= SPARC_G1_REGNUM
, addr
= mcontext_addr
+ 4 * 4;
111 regnum
<= SPARC_O7_REGNUM
; regnum
++, addr
+= 4)
112 cache
->saved_regs
[regnum
].addr
= addr
;
114 if (get_frame_memory_unsigned (this_frame
, mcontext_addr
+ 19 * 4, 4))
116 /* The register windows haven't been flushed. */
117 for (regnum
= SPARC_L0_REGNUM
; regnum
<= SPARC_I7_REGNUM
; regnum
++)
118 trad_frame_set_unknown (cache
->saved_regs
, regnum
);
122 addr
= cache
->saved_regs
[SPARC_SP_REGNUM
].addr
;
123 addr
= get_frame_memory_unsigned (this_frame
, addr
, 4);
124 for (regnum
= SPARC_L0_REGNUM
;
125 regnum
<= SPARC_I7_REGNUM
; regnum
++, addr
+= 4)
126 cache
->saved_regs
[regnum
].addr
= addr
;
133 sparc32_sol2_sigtramp_frame_this_id (struct frame_info
*this_frame
,
135 struct frame_id
*this_id
)
137 struct sparc_frame_cache
*cache
=
138 sparc32_sol2_sigtramp_frame_cache (this_frame
, this_cache
);
140 (*this_id
) = frame_id_build (cache
->base
, cache
->pc
);
143 static struct value
*
144 sparc32_sol2_sigtramp_frame_prev_register (struct frame_info
*this_frame
,
148 struct sparc_frame_cache
*cache
=
149 sparc32_sol2_sigtramp_frame_cache (this_frame
, this_cache
);
151 return trad_frame_get_prev_register (this_frame
, cache
->saved_regs
, regnum
);
155 sparc32_sol2_sigtramp_frame_sniffer (const struct frame_unwind
*self
,
156 struct frame_info
*this_frame
,
159 CORE_ADDR pc
= get_frame_pc (this_frame
);
162 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
163 if (sparc_sol2_pc_in_sigtramp (pc
, name
))
169 static const struct frame_unwind sparc32_sol2_sigtramp_frame_unwind
=
172 default_frame_unwind_stop_reason
,
173 sparc32_sol2_sigtramp_frame_this_id
,
174 sparc32_sol2_sigtramp_frame_prev_register
,
176 sparc32_sol2_sigtramp_frame_sniffer
179 /* Unglobalize NAME. */
182 sparc_sol2_static_transform_name (const char *name
)
184 /* The Sun compilers (Sun ONE Studio, Forte Developer, Sun WorkShop,
185 SunPRO) convert file static variables into global values, a
186 process known as globalization. In order to do this, the
187 compiler will create a unique prefix and prepend it to each file
188 static variable. For static variables within a function, this
189 globalization prefix is followed by the function name (nested
190 static variables within a function are supposed to generate a
191 warning message, and are left alone). The procedure is
192 documented in the Stabs Interface Manual, which is distrubuted
193 with the compilers, although version 4.0 of the manual seems to
194 be incorrect in some places, at least for SPARC. The
195 globalization prefix is encoded into an N_OPT stab, with the form
196 "G=<prefix>". The globalization prefix always seems to start
197 with a dollar sign '$'; a dot '.' is used as a seperator. So we
198 simply strip everything up until the last dot. */
202 char *p
= strrchr (name
, '.');
212 sparc32_sol2_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
214 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
216 /* The Sun compilers (Sun ONE Studio, Forte Developer, Sun WorkShop, SunPRO)
217 compiler puts out 0 instead of the address in N_SO stabs. Starting with
218 SunPRO 3.0, the compiler does this for N_FUN stabs too. */
219 set_gdbarch_sofun_address_maybe_missing (gdbarch
, 1);
221 /* The Sun compilers also do "globalization"; see the comment in
222 sparc_sol2_static_transform_name for more information. */
223 set_gdbarch_static_transform_name
224 (gdbarch
, sparc_sol2_static_transform_name
);
226 /* Solaris has SVR4-style shared libraries... */
227 set_gdbarch_skip_trampoline_code (gdbarch
, find_solib_trampoline_target
);
228 set_gdbarch_skip_solib_resolver (gdbarch
, sol2_skip_solib_resolver
);
229 set_solib_svr4_fetch_link_map_offsets
230 (gdbarch
, svr4_ilp32_fetch_link_map_offsets
);
232 /* ...which means that we need some special handling when doing
233 prologue analysis. */
234 tdep
->plt_entry_size
= 12;
236 /* Solaris has kernel-assisted single-stepping support. */
237 set_gdbarch_software_single_step (gdbarch
, NULL
);
239 frame_unwind_append_unwinder (gdbarch
, &sparc32_sol2_sigtramp_frame_unwind
);
241 /* How to print LWP PTIDs from core files. */
242 set_gdbarch_core_pid_to_str (gdbarch
, sol2_core_pid_to_str
);
246 /* Provide a prototype to silence -Wmissing-prototypes. */
247 void _initialize_sparc_sol2_tdep (void);
250 _initialize_sparc_sol2_tdep (void)
252 gdbarch_register_osabi (bfd_arch_sparc
, 0,
253 GDB_OSABI_SOLARIS
, sparc32_sol2_init_abi
);