diff options
Diffstat (limited to 'gdb/sparc-nat.c')
| -rw-r--r-- | gdb/sparc-nat.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/gdb/sparc-nat.c b/gdb/sparc-nat.c index 3ab21f0..955e65e 100644 --- a/gdb/sparc-nat.c +++ b/gdb/sparc-nat.c @@ -22,7 +22,9 @@ #include "defs.h" #include "inferior.h" #include "regcache.h" +#include "target.h" +#include "gdb_assert.h" #include <signal.h> #include "gdb_string.h" #include <sys/ptrace.h> @@ -246,8 +248,64 @@ store_inferior_registers (int regnum) return; } } + +/* Fetch StackGhost Per-Process XOR cookie. */ +LONGEST +sparc_xfer_wcookie (struct target_ops *ops, enum target_object object, + const char *annex, void *readbuf, const void *writebuf, + ULONGEST offset, LONGEST len) +{ + unsigned long wcookie = 0; + char *buf = (char *)&wcookie; + + gdb_assert (object == TARGET_OBJECT_WCOOKIE); + gdb_assert (readbuf && writebuf == NULL); + + if (offset >= sizeof (unsigned long)) + return -1; + +#ifdef PT_WCOOKIE + /* If PT_WCOOKIE is defined (by <sys/ptrace.h>), assume we're + running on an OpenBSD release that uses StackGhost (3.1 or + later). As of release 3.4, OpenBSD doesn't use a randomized + cookie yet, but a future release probably will. */ + { + int pid; + + pid = TIDGET (inferior_ptid); + if (pid == 0) + pid = PIDGET (inferior_ptid); + + /* Sanity check. The proper type for a cookie is register_t, but + we can't assume that this type exists on all systems supported + by the code in this file. */ + gdb_assert (sizeof (wcookie) == sizeof (register_t)); + + /* Fetch the cookie. */ + if (ptrace (PT_WCOOKIE, pid, (PTRACE_ARG3_TYPE) &wcookie, 0) == -1) + { + if (errno != EINVAL) + perror_with_name ("Couldn't get StackGhost cookie"); + + /* Although PT_WCOOKIE is defined on OpenBSD 3.1 and later, + the request wasn't implemented until after OpenBSD 3.4. If + the kernel doesn't support the PT_WCOOKIE request, assume + we're running on a kernel that uses non-randomized cookies. */ + wcookie = 0x3; + } + } +#endif /* PT_WCOOKIE */ + + if (len > sizeof (unsigned long) - offset) + len = sizeof (unsigned long) - offset; + + memcpy (readbuf, buf + offset, len); + return len; +} + + /* Provide a prototype to silence -Wmissing-prototypes. */ void _initialize_sparc_nat (void); |