1 /* Target-dependent code for OpenBSD/sparc64.
3 Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "frame-unwind.h"
30 #include "trad-frame.h"
32 #include "gdb_assert.h"
34 #include "obsd-tdep.h"
35 #include "sparc64-tdep.h"
36 #include "solib-svr4.h"
37 #include "bsd-uthread.h"
39 /* OpenBSD uses the traditional NetBSD core file format, even for
40 ports that use ELF. The core files don't use multiple register
41 sets. Instead, the general-purpose and floating-point registers
42 are lumped together in a single section. Unlike on NetBSD, OpenBSD
43 uses a different layout for its general-purpose registers than the
44 layout used for ptrace(2). */
46 /* From <machine/reg.h>. */
47 const struct sparc_gregset sparc64obsd_core_gregset
=
61 sparc64obsd_supply_gregset (const struct regset
*regset
,
62 struct regcache
*regcache
,
63 int regnum
, const void *gregs
, size_t len
)
65 const char *regs
= gregs
;
67 sparc64_supply_gregset (&sparc64obsd_core_gregset
, regcache
, regnum
, regs
);
68 sparc64_supply_fpregset (regcache
, regnum
, regs
+ 288);
72 /* Signal trampolines. */
74 /* Since OpenBSD 3.2, the sigtramp routine is mapped at a random page
75 in virtual memory. The randomness makes it somewhat tricky to
76 detect it, but fortunately we can rely on the fact that the start
77 of the sigtramp routine is page-aligned. We recognize the
78 trampoline by looking for the code that invokes the sigreturn
79 system call. The offset where we can find that code varies from
82 By the way, the mapping mentioned above is read-only, so you cannot
83 place a breakpoint in the signal trampoline. */
85 /* Default page size. */
86 static const int sparc64obsd_page_size
= 8192;
88 /* Offset for sigreturn(2). */
89 static const int sparc64obsd_sigreturn_offset
[] = {
90 0xf0, /* OpenBSD 3.8 */
91 0xec, /* OpenBSD 3.6 */
92 0xe8, /* OpenBSD 3.2 */
97 sparc64obsd_pc_in_sigtramp (CORE_ADDR pc
, char *name
)
99 CORE_ADDR start_pc
= (pc
& ~(sparc64obsd_page_size
- 1));
106 for (offset
= sparc64obsd_sigreturn_offset
; *offset
!= -1; offset
++)
108 /* Check for "restore %g0, SYS_sigreturn, %g1". */
109 insn
= sparc_fetch_instruction (start_pc
+ *offset
);
110 if (insn
!= 0x83e82067)
113 /* Check for "t ST_SYSCALL". */
114 insn
= sparc_fetch_instruction (start_pc
+ *offset
+ 8);
115 if (insn
!= 0x91d02000)
124 static struct sparc_frame_cache
*
125 sparc64obsd_frame_cache (struct frame_info
*this_frame
, void **this_cache
)
127 struct sparc_frame_cache
*cache
;
133 cache
= sparc_frame_cache (this_frame
, this_cache
);
134 gdb_assert (cache
== *this_cache
);
136 /* If we couldn't find the frame's function, we're probably dealing
137 with an on-stack signal trampoline. */
140 cache
->pc
= get_frame_pc (this_frame
);
141 cache
->pc
&= ~(sparc64obsd_page_size
- 1);
143 /* Since we couldn't find the frame's function, the cache was
144 initialized under the assumption that we're frameless. */
145 cache
->frameless_p
= 0;
146 addr
= get_frame_register_unsigned (this_frame
, SPARC_FP_REGNUM
);
152 /* We find the appropriate instance of `struct sigcontext' at a
153 fixed offset in the signal frame. */
154 addr
= cache
->base
+ 128 + 16;
155 cache
->saved_regs
= sparc64nbsd_sigcontext_saved_regs (addr
, this_frame
);
161 sparc64obsd_frame_this_id (struct frame_info
*this_frame
, void **this_cache
,
162 struct frame_id
*this_id
)
164 struct sparc_frame_cache
*cache
=
165 sparc64obsd_frame_cache (this_frame
, this_cache
);
167 (*this_id
) = frame_id_build (cache
->base
, cache
->pc
);
170 static struct value
*
171 sparc64obsd_frame_prev_register (struct frame_info
*this_frame
,
172 void **this_cache
, int regnum
)
174 struct sparc_frame_cache
*cache
=
175 sparc64obsd_frame_cache (this_frame
, this_cache
);
177 return trad_frame_get_prev_register (this_frame
, cache
->saved_regs
, regnum
);
181 sparc64obsd_sigtramp_frame_sniffer (const struct frame_unwind
*self
,
182 struct frame_info
*this_frame
,
185 CORE_ADDR pc
= get_frame_pc (this_frame
);
188 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
189 if (sparc64obsd_pc_in_sigtramp (pc
, name
))
195 static const struct frame_unwind sparc64obsd_frame_unwind
=
198 default_frame_unwind_stop_reason
,
199 sparc64obsd_frame_this_id
,
200 sparc64obsd_frame_prev_register
,
202 sparc64obsd_sigtramp_frame_sniffer
205 /* Kernel debugging support. */
207 static struct sparc_frame_cache
*
208 sparc64obsd_trapframe_cache (struct frame_info
*this_frame
, void **this_cache
)
210 struct sparc_frame_cache
*cache
;
211 CORE_ADDR sp
, trapframe_addr
;
217 cache
= sparc_frame_cache (this_frame
, this_cache
);
218 gdb_assert (cache
== *this_cache
);
220 sp
= get_frame_register_unsigned (this_frame
, SPARC_SP_REGNUM
);
221 trapframe_addr
= sp
+ BIAS
+ 176;
223 cache
->saved_regs
= trad_frame_alloc_saved_regs (this_frame
);
225 cache
->saved_regs
[SPARC64_STATE_REGNUM
].addr
= trapframe_addr
;
226 cache
->saved_regs
[SPARC64_PC_REGNUM
].addr
= trapframe_addr
+ 8;
227 cache
->saved_regs
[SPARC64_NPC_REGNUM
].addr
= trapframe_addr
+ 16;
229 for (regnum
= SPARC_G0_REGNUM
; regnum
<= SPARC_I7_REGNUM
; regnum
++)
230 cache
->saved_regs
[regnum
].addr
=
231 trapframe_addr
+ 48 + (regnum
- SPARC_G0_REGNUM
) * 8;
237 sparc64obsd_trapframe_this_id (struct frame_info
*this_frame
,
238 void **this_cache
, struct frame_id
*this_id
)
240 struct sparc_frame_cache
*cache
=
241 sparc64obsd_trapframe_cache (this_frame
, this_cache
);
243 (*this_id
) = frame_id_build (cache
->base
, cache
->pc
);
246 static struct value
*
247 sparc64obsd_trapframe_prev_register (struct frame_info
*this_frame
,
248 void **this_cache
, int regnum
)
250 struct sparc_frame_cache
*cache
=
251 sparc64obsd_trapframe_cache (this_frame
, this_cache
);
253 return trad_frame_get_prev_register (this_frame
, cache
->saved_regs
, regnum
);
257 sparc64obsd_trapframe_sniffer (const struct frame_unwind
*self
,
258 struct frame_info
*this_frame
,
265 /* Check whether we are in privileged mode, and bail out if we're not. */
266 pstate
= get_frame_register_unsigned (this_frame
, SPARC64_PSTATE_REGNUM
);
267 if ((pstate
& SPARC64_PSTATE_PRIV
) == 0)
270 pc
= get_frame_address_in_block (this_frame
);
271 find_pc_partial_function (pc
, &name
, NULL
, NULL
);
272 if (name
&& strcmp (name
, "Lslowtrap_reenter") == 0)
278 static const struct frame_unwind sparc64obsd_trapframe_unwind
=
281 default_frame_unwind_stop_reason
,
282 sparc64obsd_trapframe_this_id
,
283 sparc64obsd_trapframe_prev_register
,
285 sparc64obsd_trapframe_sniffer
289 /* Threads support. */
291 /* Offset wthin the thread structure where we can find %fp and %i7. */
292 #define SPARC64OBSD_UTHREAD_FP_OFFSET 232
293 #define SPARC64OBSD_UTHREAD_PC_OFFSET 240
296 sparc64obsd_supply_uthread (struct regcache
*regcache
,
297 int regnum
, CORE_ADDR addr
)
299 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
300 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
301 CORE_ADDR fp
, fp_addr
= addr
+ SPARC64OBSD_UTHREAD_FP_OFFSET
;
304 gdb_assert (regnum
>= -1);
306 fp
= read_memory_unsigned_integer (fp_addr
, 8, byte_order
);
307 if (regnum
== SPARC_SP_REGNUM
|| regnum
== -1)
309 store_unsigned_integer (buf
, 8, byte_order
, fp
);
310 regcache_raw_supply (regcache
, SPARC_SP_REGNUM
, buf
);
312 if (regnum
== SPARC_SP_REGNUM
)
316 if (regnum
== SPARC64_PC_REGNUM
|| regnum
== SPARC64_NPC_REGNUM
319 CORE_ADDR i7
, i7_addr
= addr
+ SPARC64OBSD_UTHREAD_PC_OFFSET
;
321 i7
= read_memory_unsigned_integer (i7_addr
, 8, byte_order
);
322 if (regnum
== SPARC64_PC_REGNUM
|| regnum
== -1)
324 store_unsigned_integer (buf
, 8, byte_order
, i7
+ 8);
325 regcache_raw_supply (regcache
, SPARC64_PC_REGNUM
, buf
);
327 if (regnum
== SPARC64_NPC_REGNUM
|| regnum
== -1)
329 store_unsigned_integer (buf
, 8, byte_order
, i7
+ 12);
330 regcache_raw_supply (regcache
, SPARC64_NPC_REGNUM
, buf
);
333 if (regnum
== SPARC64_PC_REGNUM
|| regnum
== SPARC64_NPC_REGNUM
)
337 sparc_supply_rwindow (regcache
, fp
, regnum
);
341 sparc64obsd_collect_uthread(const struct regcache
*regcache
,
342 int regnum
, CORE_ADDR addr
)
344 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
345 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
349 gdb_assert (regnum
>= -1);
351 if (regnum
== SPARC_SP_REGNUM
|| regnum
== -1)
353 CORE_ADDR fp_addr
= addr
+ SPARC64OBSD_UTHREAD_FP_OFFSET
;
355 regcache_raw_collect (regcache
, SPARC_SP_REGNUM
, buf
);
356 write_memory (fp_addr
,buf
, 8);
359 if (regnum
== SPARC64_PC_REGNUM
|| regnum
== -1)
361 CORE_ADDR i7
, i7_addr
= addr
+ SPARC64OBSD_UTHREAD_PC_OFFSET
;
363 regcache_raw_collect (regcache
, SPARC64_PC_REGNUM
, buf
);
364 i7
= extract_unsigned_integer (buf
, 8, byte_order
) - 8;
365 write_memory_unsigned_integer (i7_addr
, 8, byte_order
, i7
);
367 if (regnum
== SPARC64_PC_REGNUM
)
371 regcache_raw_collect (regcache
, SPARC_SP_REGNUM
, buf
);
372 sp
= extract_unsigned_integer (buf
, 8, byte_order
);
373 sparc_collect_rwindow (regcache
, sp
, regnum
);
378 sparc64obsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
380 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
382 tdep
->gregset
= regset_alloc (gdbarch
, sparc64obsd_supply_gregset
, NULL
);
383 tdep
->sizeof_gregset
= 832;
385 /* Make sure we can single-step "new" syscalls. */
386 tdep
->step_trap
= sparcnbsd_step_trap
;
388 frame_unwind_append_unwinder (gdbarch
, &sparc64obsd_frame_unwind
);
389 frame_unwind_append_unwinder (gdbarch
, &sparc64obsd_trapframe_unwind
);
391 sparc64_init_abi (info
, gdbarch
);
393 /* OpenBSD/sparc64 has SVR4-style shared libraries. */
394 set_solib_svr4_fetch_link_map_offsets
395 (gdbarch
, svr4_lp64_fetch_link_map_offsets
);
396 set_gdbarch_skip_solib_resolver (gdbarch
, obsd_skip_solib_resolver
);
398 /* OpenBSD provides a user-level threads implementation. */
399 bsd_uthread_set_supply_uthread (gdbarch
, sparc64obsd_supply_uthread
);
400 bsd_uthread_set_collect_uthread (gdbarch
, sparc64obsd_collect_uthread
);
404 /* Provide a prototype to silence -Wmissing-prototypes. */
405 void _initialize_sparc64obsd_tdep (void);
408 _initialize_sparc64obsd_tdep (void)
410 gdbarch_register_osabi (bfd_arch_sparc
, bfd_mach_sparc_v9
,
411 GDB_OSABI_OPENBSD_ELF
, sparc64obsd_init_abi
);