/* Target-dependent code for OpenBSD/sparc64.
- Copyright 2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
This file is part of GDB.
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. */
+ Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA. */
#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 "objfiles.h"
-#include "solib-svr4.h"
#include "trad-frame.h"
#include "gdb_assert.h"
+#include "obsd-tdep.h"
#include "sparc64-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. The offset where we can find the code that
- makes this system call varies from release to release. For OpenBSD
- 3.6 and later releases we can find the code at offset 0xec. For
- OpenBSD 3.5 and earlier releases, we find it at offset 0xe8. */
+ 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;
-static const int sparc64obsd_sigreturn_offset[] = { 0xec, 0xe8, -1 };
+
+/* 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)
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);
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_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target);
set_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
projects / deliverable / binutils-gdb.git / blobdiff