2004-01-24 23:18:22 +01:00
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/* Target-dependent code for OpenBSD/sparc64.
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2006-01-22 21:07:38 +01:00
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Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.
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2004-01-24 23:18:22 +01:00
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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2005-12-17 23:34:03 +01:00
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Foundation, Inc., 51 Franklin Street, Fifth Floor,
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Boston, MA 02110-1301, USA. */
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2004-01-24 23:18:22 +01:00
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#include "defs.h"
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#include "frame.h"
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#include "frame-unwind.h"
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2005-12-27 23:14:42 +01:00
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#include "gdbcore.h"
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2004-01-24 23:18:22 +01:00
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#include "osabi.h"
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2005-12-27 23:14:42 +01:00
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#include "regcache.h"
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2004-01-24 23:18:22 +01:00
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#include "regset.h"
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#include "symtab.h"
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2004-09-19 19:21:29 +02:00
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#include "objfiles.h"
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2004-01-24 23:18:22 +01:00
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#include "trad-frame.h"
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#include "gdb_assert.h"
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2005-12-26 20:31:22 +01:00
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#include "obsd-tdep.h"
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2004-01-24 23:18:22 +01:00
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#include "sparc64-tdep.h"
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2005-12-27 23:14:42 +01:00
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#include "solib-svr4.h"
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#include "bsd-uthread.h"
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2004-01-24 23:18:22 +01:00
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/* OpenBSD uses the traditional NetBSD core file format, even for
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ports that use ELF. The core files don't use multiple register
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sets. Instead, the general-purpose and floating-point registers
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are lumped together in a single section. Unlike on NetBSD, OpenBSD
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uses a different layout for its general-purpose registers than the
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layout used for ptrace(2). */
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/* From <machine/reg.h>. */
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const struct sparc_gregset sparc64obsd_core_gregset =
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{
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0 * 8, /* "tstate" */
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1 * 8, /* %pc */
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2 * 8, /* %npc */
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3 * 8, /* %y */
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-1, /* %fprs */
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-1,
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7 * 8, /* %g1 */
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22 * 8, /* %l0 */
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4 /* sizeof (%y) */
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};
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static void
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sparc64obsd_supply_gregset (const struct regset *regset,
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struct regcache *regcache,
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int regnum, const void *gregs, size_t len)
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{
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const char *regs = gregs;
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2004-05-22 17:16:22 +02:00
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sparc64_supply_gregset (&sparc64obsd_core_gregset, regcache, regnum, regs);
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2004-01-24 23:18:22 +01:00
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sparc64_supply_fpregset (regcache, regnum, regs + 288);
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}
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/* Signal trampolines. */
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2005-08-09 21:32:59 +02:00
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/* Since OpenBSD 3.2, the sigtramp routine is mapped at a random page
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in virtual memory. The randomness makes it somewhat tricky to
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detect it, but fortunately we can rely on the fact that the start
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of the sigtramp routine is page-aligned. We recognize the
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trampoline by looking for the code that invokes the sigreturn
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system call. The offset where we can find that code varies from
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release to release.
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By the way, the mapping mentioned above is read-only, so you cannot
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place a breakpoint in the signal trampoline. */
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/* Default page size. */
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2004-01-24 23:18:22 +01:00
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static const int sparc64obsd_page_size = 8192;
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2005-08-09 21:32:59 +02:00
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/* Offset for sigreturn(2). */
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static const int sparc64obsd_sigreturn_offset[] = {
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0xf0, /* OpenBSD 3.8 */
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0xec, /* OpenBSD 3.6 */
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0xe8, /* OpenBSD 3.2 */
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-1
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};
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2004-01-24 23:18:22 +01:00
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static int
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sparc64obsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
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{
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CORE_ADDR start_pc = (pc & ~(sparc64obsd_page_size - 1));
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unsigned long insn;
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2004-07-31 00:45:52 +02:00
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const int *offset;
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2004-01-24 23:18:22 +01:00
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if (name)
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return 0;
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2004-07-31 00:45:52 +02:00
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for (offset = sparc64obsd_sigreturn_offset; *offset != -1; offset++)
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2004-07-23 15:43:36 +02:00
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{
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2004-07-31 00:45:52 +02:00
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/* Check for "restore %g0, SYS_sigreturn, %g1". */
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insn = sparc_fetch_instruction (start_pc + *offset);
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if (insn != 0x83e82067)
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continue;
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2004-01-24 23:18:22 +01:00
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2004-07-31 00:45:52 +02:00
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/* Check for "t ST_SYSCALL". */
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insn = sparc_fetch_instruction (start_pc + *offset + 8);
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if (insn != 0x91d02000)
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continue;
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return 1;
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2004-07-31 22:42:29 +02:00
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}
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2004-01-24 23:18:22 +01:00
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2004-07-31 00:45:52 +02:00
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return 0;
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2004-01-24 23:18:22 +01:00
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}
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static struct sparc_frame_cache *
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sparc64obsd_frame_cache (struct frame_info *next_frame, void **this_cache)
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{
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struct sparc_frame_cache *cache;
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CORE_ADDR addr;
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if (*this_cache)
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return *this_cache;
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cache = sparc_frame_cache (next_frame, this_cache);
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gdb_assert (cache == *this_cache);
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/* If we couldn't find the frame's function, we're probably dealing
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with an on-stack signal trampoline. */
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if (cache->pc == 0)
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{
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cache->pc = frame_pc_unwind (next_frame);
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cache->pc &= ~(sparc64obsd_page_size - 1);
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/* Since we couldn't find the frame's function, the cache was
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initialized under the assumption that we're frameless. */
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cache->frameless_p = 0;
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addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM);
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2005-03-09 23:08:13 +01:00
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if (addr & 1)
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addr += BIAS;
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2004-01-24 23:18:22 +01:00
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cache->base = addr;
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}
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/* We find the appropriate instance of `struct sigcontext' at a
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fixed offset in the signal frame. */
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2005-03-09 23:08:13 +01:00
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addr = cache->base + 128 + 16;
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2004-01-24 23:18:22 +01:00
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cache->saved_regs = sparc64nbsd_sigcontext_saved_regs (addr, next_frame);
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return cache;
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}
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static void
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sparc64obsd_frame_this_id (struct frame_info *next_frame, void **this_cache,
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struct frame_id *this_id)
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{
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struct sparc_frame_cache *cache =
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sparc64obsd_frame_cache (next_frame, this_cache);
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(*this_id) = frame_id_build (cache->base, cache->pc);
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}
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static void
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sparc64obsd_frame_prev_register (struct frame_info *next_frame,
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void **this_cache,
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int regnum, int *optimizedp,
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enum lval_type *lvalp, CORE_ADDR *addrp,
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2005-06-12 13:10:56 +02:00
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int *realnump, gdb_byte *valuep)
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2004-01-24 23:18:22 +01:00
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{
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struct sparc_frame_cache *cache =
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sparc64obsd_frame_cache (next_frame, this_cache);
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2004-07-31 23:53:17 +02:00
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trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
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optimizedp, lvalp, addrp, realnump, valuep);
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2004-01-24 23:18:22 +01:00
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}
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static const struct frame_unwind sparc64obsd_frame_unwind =
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{
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SIGTRAMP_FRAME,
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sparc64obsd_frame_this_id,
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sparc64obsd_frame_prev_register
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};
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static const struct frame_unwind *
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sparc64obsd_sigtramp_frame_sniffer (struct frame_info *next_frame)
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{
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CORE_ADDR pc = frame_pc_unwind (next_frame);
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char *name;
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find_pc_partial_function (pc, &name, NULL, NULL);
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if (sparc64obsd_pc_in_sigtramp (pc, name))
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return &sparc64obsd_frame_unwind;
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return NULL;
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}
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2006-12-31 02:28:07 +01:00
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/* Kernel debugging support. */
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static struct sparc_frame_cache *
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sparc64obsd_trapframe_cache(struct frame_info *next_frame, void **this_cache)
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{
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struct sparc_frame_cache *cache;
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CORE_ADDR sp, trapframe_addr;
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int regnum;
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if (*this_cache)
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return *this_cache;
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cache = sparc_frame_cache (next_frame, this_cache);
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gdb_assert (cache == *this_cache);
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sp = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
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trapframe_addr = sp + BIAS + 176;
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cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
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cache->saved_regs[SPARC64_STATE_REGNUM].addr = trapframe_addr;
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cache->saved_regs[SPARC64_PC_REGNUM].addr = trapframe_addr + 8;
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cache->saved_regs[SPARC64_NPC_REGNUM].addr = trapframe_addr + 16;
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for (regnum = SPARC_G0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
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cache->saved_regs[regnum].addr =
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trapframe_addr + 48 + (regnum - SPARC_G0_REGNUM) * 8;
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return cache;
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}
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static void
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sparc64obsd_trapframe_this_id (struct frame_info *next_frame,
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void **this_cache, struct frame_id *this_id)
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{
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struct sparc_frame_cache *cache =
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sparc64obsd_trapframe_cache (next_frame, this_cache);
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(*this_id) = frame_id_build (cache->base, cache->pc);
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}
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static void
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sparc64obsd_trapframe_prev_register (struct frame_info *next_frame,
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void **this_cache,
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int regnum, int *optimizedp,
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enum lval_type *lvalp, CORE_ADDR *addrp,
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int *realnump, gdb_byte *valuep)
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{
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struct sparc_frame_cache *cache =
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sparc64obsd_trapframe_cache (next_frame, this_cache);
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trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
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optimizedp, lvalp, addrp, realnump, valuep);
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}
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static const struct frame_unwind sparc64obsd_trapframe_unwind =
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{
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NORMAL_FRAME,
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sparc64obsd_trapframe_this_id,
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sparc64obsd_trapframe_prev_register
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};
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static const struct frame_unwind *
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sparc64obsd_trapframe_sniffer (struct frame_info *next_frame)
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{
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ULONGEST pstate;
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char *name;
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/* Check whether we are in privileged mode, and bail out if we're not. */
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pstate = frame_unwind_register_unsigned(next_frame, SPARC64_PSTATE_REGNUM);
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if ((pstate & SPARC64_PSTATE_PRIV) == 0)
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return NULL;
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find_pc_partial_function (frame_pc_unwind (next_frame), &name, NULL, NULL);
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if (name && strcmp (name, "Lslowtrap_reenter") == 0)
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return &sparc64obsd_trapframe_unwind;
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return NULL;
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}
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|
2004-01-24 23:18:22 +01:00
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2005-12-27 23:14:42 +01:00
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/* Threads support. */
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/* Offset wthin the thread structure where we can find %fp and %i7. */
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#define SPARC64OBSD_UTHREAD_FP_OFFSET 232
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#define SPARC64OBSD_UTHREAD_PC_OFFSET 240
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static void
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sparc64obsd_supply_uthread (struct regcache *regcache,
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int regnum, CORE_ADDR addr)
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{
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CORE_ADDR fp, fp_addr = addr + SPARC64OBSD_UTHREAD_FP_OFFSET;
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gdb_byte buf[8];
|
|
|
|
|
|
|
|
|
|
gdb_assert (regnum >= -1);
|
|
|
|
|
|
|
|
|
|
fp = read_memory_unsigned_integer (fp_addr, 8);
|
|
|
|
|
if (regnum == SPARC_SP_REGNUM || regnum == -1)
|
|
|
|
|
{
|
|
|
|
|
store_unsigned_integer (buf, 8, fp);
|
|
|
|
|
regcache_raw_supply (regcache, SPARC_SP_REGNUM, buf);
|
|
|
|
|
|
|
|
|
|
if (regnum == SPARC_SP_REGNUM)
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (regnum == SPARC64_PC_REGNUM || regnum == SPARC64_NPC_REGNUM
|
|
|
|
|
|| regnum == -1)
|
|
|
|
|
{
|
|
|
|
|
CORE_ADDR i7, i7_addr = addr + SPARC64OBSD_UTHREAD_PC_OFFSET;
|
|
|
|
|
|
|
|
|
|
i7 = read_memory_unsigned_integer (i7_addr, 8);
|
|
|
|
|
if (regnum == SPARC64_PC_REGNUM || regnum == -1)
|
|
|
|
|
{
|
|
|
|
|
store_unsigned_integer (buf, 8, i7 + 8);
|
|
|
|
|
regcache_raw_supply (regcache, SPARC64_PC_REGNUM, buf);
|
|
|
|
|
}
|
|
|
|
|
if (regnum == SPARC64_NPC_REGNUM || regnum == -1)
|
|
|
|
|
{
|
|
|
|
|
store_unsigned_integer (buf, 8, i7 + 12);
|
|
|
|
|
regcache_raw_supply (regcache, SPARC64_NPC_REGNUM, buf);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (regnum == SPARC64_PC_REGNUM || regnum == SPARC64_NPC_REGNUM)
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
sparc_supply_rwindow (regcache, fp, regnum);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
sparc64obsd_collect_uthread(const struct regcache *regcache,
|
|
|
|
|
int regnum, CORE_ADDR addr)
|
|
|
|
|
{
|
|
|
|
|
CORE_ADDR sp;
|
|
|
|
|
gdb_byte buf[8];
|
|
|
|
|
|
|
|
|
|
gdb_assert (regnum >= -1);
|
|
|
|
|
|
|
|
|
|
if (regnum == SPARC_SP_REGNUM || regnum == -1)
|
|
|
|
|
{
|
|
|
|
|
CORE_ADDR fp_addr = addr + SPARC64OBSD_UTHREAD_FP_OFFSET;
|
|
|
|
|
|
|
|
|
|
regcache_raw_collect (regcache, SPARC_SP_REGNUM, buf);
|
|
|
|
|
write_memory (fp_addr,buf, 8);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (regnum == SPARC64_PC_REGNUM || regnum == -1)
|
|
|
|
|
{
|
|
|
|
|
CORE_ADDR i7, i7_addr = addr + SPARC64OBSD_UTHREAD_PC_OFFSET;
|
|
|
|
|
|
|
|
|
|
regcache_raw_collect (regcache, SPARC64_PC_REGNUM, buf);
|
|
|
|
|
i7 = extract_unsigned_integer (buf, 8) - 8;
|
|
|
|
|
write_memory_unsigned_integer (i7_addr, 8, i7);
|
|
|
|
|
|
|
|
|
|
if (regnum == SPARC64_PC_REGNUM)
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
regcache_raw_collect (regcache, SPARC_SP_REGNUM, buf);
|
|
|
|
|
sp = extract_unsigned_integer (buf, 8);
|
|
|
|
|
sparc_collect_rwindow (regcache, sp, regnum);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
2004-01-24 23:18:22 +01:00
|
|
|
|
static void
|
|
|
|
|
sparc64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
|
|
|
|
|
{
|
|
|
|
|
struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
|
|
|
|
|
|
2004-05-22 17:16:22 +02:00
|
|
|
|
tdep->gregset = regset_alloc (gdbarch, sparc64obsd_supply_gregset, NULL);
|
2004-01-24 23:18:22 +01:00
|
|
|
|
tdep->sizeof_gregset = 832;
|
|
|
|
|
|
2006-01-22 21:07:38 +01:00
|
|
|
|
/* Make sure we can single-step "new" syscalls. */
|
|
|
|
|
tdep->step_trap = sparcnbsd_step_trap;
|
|
|
|
|
|
2004-01-24 23:18:22 +01:00
|
|
|
|
frame_unwind_append_sniffer (gdbarch, sparc64obsd_sigtramp_frame_sniffer);
|
2006-12-31 02:28:07 +01:00
|
|
|
|
frame_unwind_append_sniffer (gdbarch, sparc64obsd_trapframe_sniffer);
|
2004-01-24 23:18:22 +01:00
|
|
|
|
|
|
|
|
|
sparc64_init_abi (info, gdbarch);
|
|
|
|
|
|
2005-03-09 23:08:13 +01:00
|
|
|
|
/* OpenBSD/sparc64 has SVR4-style shared libraries. */
|
2004-01-24 23:18:22 +01:00
|
|
|
|
set_solib_svr4_fetch_link_map_offsets
|
2004-09-19 19:21:29 +02:00
|
|
|
|
(gdbarch, svr4_lp64_fetch_link_map_offsets);
|
2005-12-26 20:31:22 +01:00
|
|
|
|
set_gdbarch_skip_solib_resolver (gdbarch, obsd_skip_solib_resolver);
|
2005-12-27 23:14:42 +01:00
|
|
|
|
|
|
|
|
|
/* OpenBSD provides a user-level threads implementation. */
|
|
|
|
|
bsd_uthread_set_supply_uthread (gdbarch, sparc64obsd_supply_uthread);
|
|
|
|
|
bsd_uthread_set_collect_uthread (gdbarch, sparc64obsd_collect_uthread);
|
2004-01-24 23:18:22 +01:00
|
|
|
|
}
|
|
|
|
|
|
2005-03-09 23:08:13 +01:00
|
|
|
|
|
2004-01-24 23:18:22 +01:00
|
|
|
|
/* Provide a prototype to silence -Wmissing-prototypes. */
|
|
|
|
|
void _initialize_sparc64obsd_tdep (void);
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
_initialize_sparc64obsd_tdep (void)
|
|
|
|
|
{
|
|
|
|
|
gdbarch_register_osabi (bfd_arch_sparc, bfd_mach_sparc_v9,
|
|
|
|
|
GDB_OSABI_OPENBSD_ELF, sparc64obsd_init_abi);
|
|
|
|
|
}
|