/* Target-dependent code for GNU/Linux x86-64.
- Copyright 2001, 2003, 2004, 2005 Free Software Foundation, Inc.
+ Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007
+ Free Software Foundation, Inc.
Contributed by Jiri Smid, SuSE Labs.
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 "regcache.h"
#include "osabi.h"
#include "symtab.h"
+#include "gdbtypes.h"
+#include "reggroups.h"
+#include "amd64-linux-tdep.h"
#include "gdb_string.h"
-1 /* %gs */
};
+/* Replacement register functions which know about %orig_rax. */
+
+static const char *
+amd64_linux_register_name (int reg)
+{
+ if (reg == AMD64_LINUX_ORIG_RAX_REGNUM)
+ return "orig_rax";
+
+ return amd64_register_name (reg);
+}
+
+static struct type *
+amd64_linux_register_type (struct gdbarch *gdbarch, int reg)
+{
+ if (reg == AMD64_LINUX_ORIG_RAX_REGNUM)
+ return builtin_type_int64;
+
+ return amd64_register_type (gdbarch, reg);
+}
+
+static int
+amd64_linux_register_reggroup_p (struct gdbarch *gdbarch, int regnum,
+ struct reggroup *group)
+{
+ if (regnum == AMD64_LINUX_ORIG_RAX_REGNUM)
+ return (group == system_reggroup
+ || group == save_reggroup
+ || group == restore_reggroup);
+ return default_register_reggroup_p (gdbarch, regnum, group);
+}
+
+/* Set the program counter for process PTID to PC. */
+
+static void
+amd64_linux_write_pc (CORE_ADDR pc, ptid_t ptid)
+{
+ write_register_pid (AMD64_RIP_REGNUM, pc, ptid);
+
+ /* We must be careful with modifying the program counter. If we
+ just interrupted a system call, the kernel might try to restart
+ it when we resume the inferior. On restarting the system call,
+ the kernel will try backing up the program counter even though it
+ no longer points at the system call. This typically results in a
+ SIGSEGV or SIGILL. We can prevent this by writing `-1' in the
+ "orig_rax" pseudo-register.
+
+ Note that "orig_rax" is saved when setting up a dummy call frame.
+ This means that it is properly restored when that frame is
+ popped, and that the interrupted system call will be restarted
+ when we resume the inferior on return from a function call from
+ within GDB. In all other cases the system call will not be
+ restarted. */
+ write_register_pid (AMD64_LINUX_ORIG_RAX_REGNUM, -1, ptid);
+}
+
static void
amd64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
{
set_solib_svr4_fetch_link_map_offsets
(gdbarch, svr4_lp64_fetch_link_map_offsets);
+ /* Add the %orig_rax register used for syscall restarting. */
+ set_gdbarch_write_pc (gdbarch, amd64_linux_write_pc);
+ set_gdbarch_num_regs (gdbarch, AMD64_LINUX_NUM_REGS);
+ set_gdbarch_register_name (gdbarch, amd64_linux_register_name);
+ set_gdbarch_register_type (gdbarch, amd64_linux_register_type);
+ set_gdbarch_register_reggroup_p (gdbarch, amd64_linux_register_reggroup_p);
+
/* Enable TLS support. */
set_gdbarch_fetch_tls_load_module_address (gdbarch,
svr4_fetch_objfile_link_map);