/* Target-dependent code for OpenBSD/sparc64.
- Copyright 2004 Free Software Foundation, Inc.
+ Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "frame.h"
#include "frame-unwind.h"
+#include "gdbcore.h"
#include "osabi.h"
+#include "regcache.h"
#include "regset.h"
#include "symtab.h"
-#include "solib-svr4.h"
+#include "objfiles.h"
#include "trad-frame.h"
#include "gdb_assert.h"
+#include "obsd-tdep.h"
#include "sparc64-tdep.h"
-#include "nbsd-tdep.h"
+#include "solib-svr4.h"
+#include "bsd-uthread.h"
/* OpenBSD uses the traditional NetBSD core file format, even for
ports that use ELF. The core files don't use multiple register
/* Signal trampolines. */
-/* The OpenBSD kernel maps the signal trampoline at some random
- location in user space, which means that the traditional BSD way of
- detecting it won't work.
+/* Since OpenBSD 3.2, the sigtramp routine is mapped at a random page
+ in virtual memory. The randomness makes it somewhat tricky to
+ detect it, but fortunately we can rely on the fact that the start
+ of the sigtramp routine is page-aligned. We recognize the
+ trampoline by looking for the code that invokes the sigreturn
+ system call. The offset where we can find that code varies from
+ release to release.
- The signal trampoline will be mapped at an address that is page
- aligned. We recognize the signal trampoline by the looking for the
- sigreturn system call. */
+ By the way, the mapping mentioned above is read-only, so you cannot
+ place a breakpoint in the signal trampoline. */
+/* Default page size. */
static const int sparc64obsd_page_size = 8192;
+/* Offset for sigreturn(2). */
+static const int sparc64obsd_sigreturn_offset[] = {
+ 0xf0, /* OpenBSD 3.8 */
+ 0xec, /* OpenBSD 3.6 */
+ 0xe8, /* OpenBSD 3.2 */
+ -1
+};
+
static int
sparc64obsd_pc_in_sigtramp (CORE_ADDR pc, char *name)
{
CORE_ADDR start_pc = (pc & ~(sparc64obsd_page_size - 1));
unsigned long insn;
- int offset = 0;
+ const int *offset;
if (name)
return 0;
- retry:
- /* Check for "restore %g0, SYS_sigreturn, %g1". */
- insn = sparc_fetch_instruction (start_pc + offset + 0xec);
- if (insn != 0x83e82067)
+ for (offset = sparc64obsd_sigreturn_offset; *offset != -1; offset++)
{
- if (offset == 0)
- {
- /* In OpenBSD 3.5 and earlier releases, the code
- implementing the sigreturn system call was at a different
- offset within the signal trampoline. Try again. */
- offset = -4;
- goto retry;
- }
+ /* Check for "restore %g0, SYS_sigreturn, %g1". */
+ insn = sparc_fetch_instruction (start_pc + *offset);
+ if (insn != 0x83e82067)
+ continue;
- return 0;
- }
+ /* Check for "t ST_SYSCALL". */
+ insn = sparc_fetch_instruction (start_pc + *offset + 8);
+ if (insn != 0x91d02000)
+ continue;
- /* Check for "t ST_SYSCALL". */
- insn = sparc_fetch_instruction (start_pc + offset + 0xf4);
- if (insn != 0x91d02000)
- return 0;
+ return 1;
+ }
- return 1;
+ return 0;
}
static struct sparc_frame_cache *
initialized under the assumption that we're frameless. */
cache->frameless_p = 0;
addr = frame_unwind_register_unsigned (next_frame, SPARC_FP_REGNUM);
+ if (addr & 1)
+ addr += BIAS;
cache->base = addr;
}
/* We find the appropriate instance of `struct sigcontext' at a
fixed offset in the signal frame. */
- addr = cache->base + BIAS + 128 + 16;
+ addr = cache->base + 128 + 16;
cache->saved_regs = sparc64nbsd_sigcontext_saved_regs (addr, next_frame);
return cache;
void **this_cache,
int regnum, int *optimizedp,
enum lval_type *lvalp, CORE_ADDR *addrp,
- int *realnump, void *valuep)
+ int *realnump, gdb_byte *valuep)
{
struct sparc_frame_cache *cache =
sparc64obsd_frame_cache (next_frame, this_cache);
- trad_frame_prev_register (next_frame, cache->saved_regs, regnum,
- optimizedp, lvalp, addrp, realnump, valuep);
+ trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
+ optimizedp, lvalp, addrp, realnump, valuep);
}
static const struct frame_unwind sparc64obsd_frame_unwind =
return NULL;
}
\f
+/* Kernel debugging support. */
+
+static struct sparc_frame_cache *
+sparc64obsd_trapframe_cache (struct frame_info *next_frame, void **this_cache)
+{
+ struct sparc_frame_cache *cache;
+ CORE_ADDR sp, trapframe_addr;
+ int regnum;
+
+ if (*this_cache)
+ return *this_cache;
+
+ cache = sparc_frame_cache (next_frame, this_cache);
+ gdb_assert (cache == *this_cache);
+
+ sp = frame_unwind_register_unsigned (next_frame, SPARC_SP_REGNUM);
+ trapframe_addr = sp + BIAS + 176;
+
+ cache->saved_regs = trad_frame_alloc_saved_regs (next_frame);
+
+ cache->saved_regs[SPARC64_STATE_REGNUM].addr = trapframe_addr;
+ cache->saved_regs[SPARC64_PC_REGNUM].addr = trapframe_addr + 8;
+ cache->saved_regs[SPARC64_NPC_REGNUM].addr = trapframe_addr + 16;
+
+ for (regnum = SPARC_G0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++)
+ cache->saved_regs[regnum].addr =
+ trapframe_addr + 48 + (regnum - SPARC_G0_REGNUM) * 8;
+
+ return cache;
+}
+
+static void
+sparc64obsd_trapframe_this_id (struct frame_info *next_frame,
+ void **this_cache, struct frame_id *this_id)
+{
+ struct sparc_frame_cache *cache =
+ sparc64obsd_trapframe_cache (next_frame, this_cache);
+
+ (*this_id) = frame_id_build (cache->base, cache->pc);
+}
+
+static void
+sparc64obsd_trapframe_prev_register (struct frame_info *next_frame,
+ void **this_cache,
+ int regnum, int *optimizedp,
+ enum lval_type *lvalp, CORE_ADDR *addrp,
+ int *realnump, gdb_byte *valuep)
+{
+ struct sparc_frame_cache *cache =
+ sparc64obsd_trapframe_cache (next_frame, this_cache);
+
+ trad_frame_get_prev_register (next_frame, cache->saved_regs, regnum,
+ optimizedp, lvalp, addrp, realnump, valuep);
+}
+
+static const struct frame_unwind sparc64obsd_trapframe_unwind =
+{
+ NORMAL_FRAME,
+ sparc64obsd_trapframe_this_id,
+ sparc64obsd_trapframe_prev_register
+};
+
+static const struct frame_unwind *
+sparc64obsd_trapframe_sniffer (struct frame_info *next_frame)
+{
+ CORE_ADDR pc;
+ ULONGEST pstate;
+ char *name;
+
+ /* Check whether we are in privileged mode, and bail out if we're not. */
+ pstate = frame_unwind_register_unsigned (next_frame, SPARC64_PSTATE_REGNUM);
+ if ((pstate & SPARC64_PSTATE_PRIV) == 0)
+ return NULL;
+
+ pc = frame_unwind_address_in_block (next_frame, NORMAL_FRAME);
+ find_pc_partial_function (pc, &name, NULL, NULL);
+ if (name && strcmp (name, "Lslowtrap_reenter") == 0)
+ return &sparc64obsd_trapframe_unwind;
+
+ return NULL;
+}
+\f
+
+/* Threads support. */
+
+/* Offset wthin the thread structure where we can find %fp and %i7. */
+#define SPARC64OBSD_UTHREAD_FP_OFFSET 232
+#define SPARC64OBSD_UTHREAD_PC_OFFSET 240
+
+static void
+sparc64obsd_supply_uthread (struct regcache *regcache,
+ int regnum, CORE_ADDR addr)
+{
+ CORE_ADDR fp, fp_addr = addr + SPARC64OBSD_UTHREAD_FP_OFFSET;
+ 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);
+}
+\f
static void
sparc64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
tdep->gregset = regset_alloc (gdbarch, sparc64obsd_supply_gregset, NULL);
tdep->sizeof_gregset = 832;
+ /* Make sure we can single-step "new" syscalls. */
+ tdep->step_trap = sparcnbsd_step_trap;
+
frame_unwind_append_sniffer (gdbarch, sparc64obsd_sigtramp_frame_sniffer);
+ frame_unwind_append_sniffer (gdbarch, sparc64obsd_trapframe_sniffer);
sparc64_init_abi (info, gdbarch);
+ /* OpenBSD/sparc64 has SVR4-style shared libraries. */
set_solib_svr4_fetch_link_map_offsets
- (gdbarch, nbsd_lp64_solib_svr4_fetch_link_map_offsets);
-}
+ (gdbarch, svr4_lp64_fetch_link_map_offsets);
+ set_gdbarch_skip_solib_resolver (gdbarch, obsd_skip_solib_resolver);
+ /* 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);
+}
\f
+
/* Provide a prototype to silence -Wmissing-prototypes. */
void _initialize_sparc64obsd_tdep (void);
projects / deliverable / binutils-gdb.git / blobdiff