1 /* Target-dependent code for OpenBSD/sparc64.
3 Copyright (C) 2004-2018 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"
31 #include "obsd-tdep.h"
32 #include "sparc64-tdep.h"
33 #include "solib-svr4.h"
34 #include "bsd-uthread.h"
36 /* Older OpenBSD versions used the traditional NetBSD core file
37 format, even for ports that use ELF. These core files don't use
38 multiple register sets. Instead, the general-purpose and
39 floating-point registers are lumped together in a single section.
40 Unlike on NetBSD, OpenBSD uses a different layout for its
41 general-purpose registers than the layout used for ptrace(2).
43 Newer OpenBSD versions use ELF core files. Here the register sets
44 match the ptrace(2) layout. */
46 /* From <machine/reg.h>. */
47 const struct sparc_gregmap sparc64obsd_gregmap =
60 const struct sparc_gregmap sparc64obsd_core_gregmap =
74 sparc64obsd_supply_gregset (const struct regset *regset,
75 struct regcache *regcache,
76 int regnum, const void *gregs, size_t len)
78 const void *fpregs = (char *)gregs + 288;
82 sparc64_supply_gregset (&sparc64obsd_gregmap, regcache, regnum, gregs);
86 sparc64_supply_gregset (&sparc64obsd_core_gregmap, regcache, regnum, gregs);
87 sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
91 sparc64obsd_supply_fpregset (const struct regset *regset,
92 struct regcache *regcache,
93 int regnum, const void *fpregs, size_t len)
95 sparc64_supply_fpregset (&sparc64_bsd_fpregmap, regcache, regnum, fpregs);
99 /* Signal trampolines. */
101 /* Since OpenBSD 3.2, the sigtramp routine is mapped at a random page
102 in virtual memory. The randomness makes it somewhat tricky to
103 detect it, but fortunately we can rely on the fact that the start
104 of the sigtramp routine is page-aligned. We recognize the
105 trampoline by looking for the code that invokes the sigreturn
106 system call. The offset where we can find that code varies from
109 By the way, the mapping mentioned above is read-only, so you cannot
110 place a breakpoint in the signal trampoline. */
112 /* Default page size. */
113 static const int sparc64obsd_page_size = 8192;
115 /* Offset for sigreturn(2). */
116 static const int sparc64obsd_sigreturn_offset[] = {
117 0xf0, /* OpenBSD 3.8 */
118 0xec, /* OpenBSD 3.6 */
119 0xe8, /* OpenBSD 3.2 */
124 sparc64obsd_pc_in_sigtramp (CORE_ADDR pc, const char *name)
126 CORE_ADDR start_pc = (pc & ~(sparc64obsd_page_size - 1));
133 for (offset = sparc64obsd_sigreturn_offset; *offset != -1; offset++)
135 /* Check for "restore %g0, SYS_sigreturn, %g1". */
136 insn = sparc_fetch_instruction (start_pc + *offset);
137 if (insn != 0x83e82067)
140 /* Check for "t ST_SYSCALL". */
141 insn = sparc_fetch_instruction (start_pc + *offset + 8);
142 if (insn != 0x91d02000)
151 static struct sparc_frame_cache *
152 sparc64obsd_frame_cache (struct frame_info *this_frame, void **this_cache)
154 struct sparc_frame_cache *cache;
158 return (struct sparc_frame_cache *) *this_cache;
160 cache = sparc_frame_cache (this_frame, this_cache);
161 gdb_assert (cache == *this_cache);
163 /* If we couldn't find the frame's function, we're probably dealing
164 with an on-stack signal trampoline. */
167 cache->pc = get_frame_pc (this_frame);
168 cache->pc &= ~(sparc64obsd_page_size - 1);
170 /* Since we couldn't find the frame's function, the cache was
171 initialized under the assumption that we're frameless. */
172 sparc_record_save_insn (cache);
173 addr = get_frame_register_unsigned (this_frame, SPARC_FP_REGNUM);
179 /* We find the appropriate instance of `struct sigcontext' at a
180 fixed offset in the signal frame. */
181 addr = cache->base + 128 + 16;
182 cache->saved_regs = sparc64nbsd_sigcontext_saved_regs (addr, this_frame);
188 sparc64obsd_frame_this_id (struct frame_info *this_frame, void **this_cache,
189 struct frame_id *this_id)
191 struct sparc_frame_cache *cache =
192 sparc64obsd_frame_cache (this_frame, this_cache);
194 (*this_id) = frame_id_build (cache->base, cache->pc);
197 static struct value *
198 sparc64obsd_frame_prev_register (struct frame_info *this_frame,
199 void **this_cache, int regnum)
201 struct sparc_frame_cache *cache =
202 sparc64obsd_frame_cache (this_frame, this_cache);
204 return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
208 sparc64obsd_sigtramp_frame_sniffer (const struct frame_unwind *self,
209 struct frame_info *this_frame,
212 CORE_ADDR pc = get_frame_pc (this_frame);
215 find_pc_partial_function (pc, &name, NULL, NULL);
216 if (sparc64obsd_pc_in_sigtramp (pc, name))
222 static const struct frame_unwind sparc64obsd_frame_unwind =
225 default_frame_unwind_stop_reason,
226 sparc64obsd_frame_this_id,
227 sparc64obsd_frame_prev_register,
229 sparc64obsd_sigtramp_frame_sniffer
232 /* Kernel debugging support. */
234 static struct sparc_frame_cache *
235 sparc64obsd_trapframe_cache (struct frame_info *this_frame, void **this_cache)
237 struct sparc_frame_cache *cache;
238 CORE_ADDR sp, trapframe_addr;
242 return (struct sparc_frame_cache *) *this_cache;
244 cache = sparc_frame_cache (this_frame, this_cache);
245 gdb_assert (cache == *this_cache);
247 sp = get_frame_register_unsigned (this_frame, SPARC_SP_REGNUM);
248 trapframe_addr = sp + BIAS + 176;
250 cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
252 cache->saved_regs[SPARC64_STATE_REGNUM].addr = trapframe_addr;
253 cache->saved_regs[SPARC64_PC_REGNUM].addr = trapframe_addr + 8;
254 cache->saved_regs[SPARC64_NPC_REGNUM].addr = trapframe_addr + 16;
256 for (regnum = SPARC_G0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
257 cache->saved_regs[regnum].addr =
258 trapframe_addr + 48 + (regnum - SPARC_G0_REGNUM) * 8;
264 sparc64obsd_trapframe_this_id (struct frame_info *this_frame,
265 void **this_cache, struct frame_id *this_id)
267 struct sparc_frame_cache *cache =
268 sparc64obsd_trapframe_cache (this_frame, this_cache);
270 (*this_id) = frame_id_build (cache->base, cache->pc);
273 static struct value *
274 sparc64obsd_trapframe_prev_register (struct frame_info *this_frame,
275 void **this_cache, int regnum)
277 struct sparc_frame_cache *cache =
278 sparc64obsd_trapframe_cache (this_frame, this_cache);
280 return trad_frame_get_prev_register (this_frame, cache->saved_regs, regnum);
284 sparc64obsd_trapframe_sniffer (const struct frame_unwind *self,
285 struct frame_info *this_frame,
292 /* Check whether we are in privileged mode, and bail out if we're not. */
293 pstate = get_frame_register_unsigned (this_frame, SPARC64_PSTATE_REGNUM);
294 if ((pstate & SPARC64_PSTATE_PRIV) == 0)
297 pc = get_frame_address_in_block (this_frame);
298 find_pc_partial_function (pc, &name, NULL, NULL);
299 if (name && strcmp (name, "Lslowtrap_reenter") == 0)
305 static const struct frame_unwind sparc64obsd_trapframe_unwind =
308 default_frame_unwind_stop_reason,
309 sparc64obsd_trapframe_this_id,
310 sparc64obsd_trapframe_prev_register,
312 sparc64obsd_trapframe_sniffer
316 /* Threads support. */
318 /* Offset wthin the thread structure where we can find %fp and %i7. */
319 #define SPARC64OBSD_UTHREAD_FP_OFFSET 232
320 #define SPARC64OBSD_UTHREAD_PC_OFFSET 240
323 sparc64obsd_supply_uthread (struct regcache *regcache,
324 int regnum, CORE_ADDR addr)
326 struct gdbarch *gdbarch = regcache->arch ();
327 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
328 CORE_ADDR fp, fp_addr = addr + SPARC64OBSD_UTHREAD_FP_OFFSET;
331 gdb_assert (regnum >= -1);
333 fp = read_memory_unsigned_integer (fp_addr, 8, byte_order);
334 if (regnum == SPARC_SP_REGNUM || regnum == -1)
336 store_unsigned_integer (buf, 8, byte_order, fp);
337 regcache->raw_supply (SPARC_SP_REGNUM, buf);
339 if (regnum == SPARC_SP_REGNUM)
343 if (regnum == SPARC64_PC_REGNUM || regnum == SPARC64_NPC_REGNUM
346 CORE_ADDR i7, i7_addr = addr + SPARC64OBSD_UTHREAD_PC_OFFSET;
348 i7 = read_memory_unsigned_integer (i7_addr, 8, byte_order);
349 if (regnum == SPARC64_PC_REGNUM || regnum == -1)
351 store_unsigned_integer (buf, 8, byte_order, i7 + 8);
352 regcache->raw_supply (SPARC64_PC_REGNUM, buf);
354 if (regnum == SPARC64_NPC_REGNUM || regnum == -1)
356 store_unsigned_integer (buf, 8, byte_order, i7 + 12);
357 regcache->raw_supply (SPARC64_NPC_REGNUM, buf);
360 if (regnum == SPARC64_PC_REGNUM || regnum == SPARC64_NPC_REGNUM)
364 sparc_supply_rwindow (regcache, fp, regnum);
368 sparc64obsd_collect_uthread(const struct regcache *regcache,
369 int regnum, CORE_ADDR addr)
371 struct gdbarch *gdbarch = regcache->arch ();
372 enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
376 gdb_assert (regnum >= -1);
378 if (regnum == SPARC_SP_REGNUM || regnum == -1)
380 CORE_ADDR fp_addr = addr + SPARC64OBSD_UTHREAD_FP_OFFSET;
382 regcache_raw_collect (regcache, SPARC_SP_REGNUM, buf);
383 write_memory (fp_addr,buf, 8);
386 if (regnum == SPARC64_PC_REGNUM || regnum == -1)
388 CORE_ADDR i7, i7_addr = addr + SPARC64OBSD_UTHREAD_PC_OFFSET;
390 regcache_raw_collect (regcache, SPARC64_PC_REGNUM, buf);
391 i7 = extract_unsigned_integer (buf, 8, byte_order) - 8;
392 write_memory_unsigned_integer (i7_addr, 8, byte_order, i7);
394 if (regnum == SPARC64_PC_REGNUM)
398 regcache_raw_collect (regcache, SPARC_SP_REGNUM, buf);
399 sp = extract_unsigned_integer (buf, 8, byte_order);
400 sparc_collect_rwindow (regcache, sp, regnum);
404 static const struct regset sparc64obsd_gregset =
406 NULL, sparc64obsd_supply_gregset, NULL
409 static const struct regset sparc64obsd_fpregset =
411 NULL, sparc64obsd_supply_fpregset, NULL
415 sparc64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
417 struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
419 tdep->gregset = &sparc64obsd_gregset;
420 tdep->sizeof_gregset = 288;
421 tdep->fpregset = &sparc64obsd_fpregset;
422 tdep->sizeof_fpregset = 272;
424 /* Make sure we can single-step "new" syscalls. */
425 tdep->step_trap = sparcnbsd_step_trap;
427 frame_unwind_append_unwinder (gdbarch, &sparc64obsd_frame_unwind);
428 frame_unwind_append_unwinder (gdbarch, &sparc64obsd_trapframe_unwind);
430 sparc64_init_abi (info, gdbarch);
431 obsd_init_abi (info, gdbarch);
433 /* OpenBSD/sparc64 has SVR4-style shared libraries. */
434 set_solib_svr4_fetch_link_map_offsets
435 (gdbarch, svr4_lp64_fetch_link_map_offsets);
436 set_gdbarch_skip_solib_resolver (gdbarch, obsd_skip_solib_resolver);
438 /* OpenBSD provides a user-level threads implementation. */
439 bsd_uthread_set_supply_uthread (gdbarch, sparc64obsd_supply_uthread);
440 bsd_uthread_set_collect_uthread (gdbarch, sparc64obsd_collect_uthread);
444 _initialize_sparc64obsd_tdep (void)
446 gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
447 GDB_OSABI_OPENBSD, sparc64obsd_init_abi);