/* Native-dependent code for FreeBSD/i386.
- Copyright (C) 2001-2014 Free Software Foundation, Inc.
+ Copyright (C) 2001-2016 Free Software Foundation, Inc.
This file is part of GDB.
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/sysctl.h>
+#include <sys/user.h>
#include "fbsd-nat.h"
#include "i386-tdep.h"
}
\f
+#ifdef PT_GETXSTATE_INFO
+/* Implement the to_read_description method. */
+
+static const struct target_desc *
+i386fbsd_read_description (struct target_ops *ops)
+{
+ static int xsave_probed;
+ static uint64_t xcr0;
+
+ if (!xsave_probed)
+ {
+ struct ptrace_xstate_info info;
+
+ if (ptrace (PT_GETXSTATE_INFO, ptid_get_pid (inferior_ptid),
+ (PTRACE_TYPE_ARG3) &info, sizeof (info)) == 0)
+ {
+ i386bsd_xsave_len = info.xsave_len;
+ xcr0 = info.xsave_mask;
+ }
+ xsave_probed = 1;
+ }
+
+ if (i386bsd_xsave_len != 0)
+ {
+ return i386_target_description (xcr0);
+ }
+ else
+ return tdesc_i386;
+}
+#endif
+
/* Prevent warning from -Wmissing-prototypes. */
void _initialize_i386fbsd_nat (void);
#endif /* HAVE_PT_GETDBREGS */
+#ifdef PT_GETXSTATE_INFO
+ t->to_read_description = i386fbsd_read_description;
+#endif
t->to_resume = i386fbsd_resume;
- t->to_pid_to_exec_file = fbsd_pid_to_exec_file;
- t->to_find_memory_regions = fbsd_find_memory_regions;
- add_target (t);
+ fbsd_nat_add_target (t);
/* Support debugging kernel virtual memory images. */
bsd_kvm_add_target (i386fbsd_supply_pcb);
- /* FreeBSD provides a kern.ps_strings sysctl that we can use to
- locate the sigtramp. That way we can still recognize a sigtramp
- if its location is changed in a new kernel. Of course this is
- still based on the assumption that the sigtramp is placed
- directly under the location where the program arguments and
- environment can be found. */
-#ifdef KERN_PS_STRINGS
+#ifdef KERN_PROC_SIGTRAMP
+ /* Normally signal frames are detected via i386fbsd_sigtramp_p.
+ However, FreeBSD 9.2 through 10.1 do not include the page holding
+ the signal code in core dumps. These releases do provide a
+ kern.proc.sigtramp.<pid> sysctl that returns the location of the
+ signal trampoline for a running process. We fetch the location
+ of the current (gdb) process and use this to identify signal
+ frames in core dumps from these releases. */
{
- int mib[2];
- u_long ps_strings;
+ int mib[4];
+ struct kinfo_sigtramp kst;
size_t len;
mib[0] = CTL_KERN;
- mib[1] = KERN_PS_STRINGS;
- len = sizeof (ps_strings);
- if (sysctl (mib, 2, &ps_strings, &len, NULL, 0) == 0)
+ mib[1] = KERN_PROC;
+ mib[2] = KERN_PROC_SIGTRAMP;
+ mib[3] = getpid ();
+ len = sizeof (kst);
+ if (sysctl (mib, 4, &kst, &len, NULL, 0) == 0)
{
- i386fbsd_sigtramp_start_addr = ps_strings - 128;
- i386fbsd_sigtramp_end_addr = ps_strings;
+ i386fbsd_sigtramp_start_addr = (uintptr_t) kst.ksigtramp_start;
+ i386fbsd_sigtramp_end_addr = (uintptr_t) kst.ksigtramp_end;
}
}
#endif