/* Native-dependent code for FreeBSD/i386.
- Copyright 2001, 2002, 2003 Free Software Foundation, Inc.
+
+ Copyright (C) 2001-2016 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 "inferior.h"
#include "regcache.h"
+#include "target.h"
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/sysctl.h>
+#include <sys/user.h>
+#include "fbsd-nat.h"
#include "i386-tdep.h"
+#include "x86-nat.h"
+#include "x86bsd-nat.h"
+#include "i386bsd-nat.h"
-/* Prevent warning from -Wmissing-prototypes. */
-void _initialize_i386fbsd_nat (void);
+/* Resume execution of the inferior process. If STEP is nonzero,
+ single-step it. If SIGNAL is nonzero, give it that signal. */
-/* Resume execution of the inferior process.
- If STEP is nonzero, single-step it.
- If SIGNAL is nonzero, give it that signal. */
-
-void
-child_resume (ptid_t ptid, int step, enum target_signal signal)
+static void
+i386fbsd_resume (struct target_ops *ops,
+ ptid_t ptid, int step, enum gdb_signal signal)
{
pid_t pid = ptid_get_pid (ptid);
int request = PT_STEP;
if (!step)
{
+ struct regcache *regcache = get_current_regcache ();
ULONGEST eflags;
/* Workaround for a bug in FreeBSD. Make sure that the trace
never goes through the kernel's trap() function which would
normally clear it. */
- regcache_cooked_read_unsigned (current_regcache, I386_EFLAGS_REGNUM,
+ regcache_cooked_read_unsigned (regcache, I386_EFLAGS_REGNUM,
&eflags);
if (eflags & 0x0100)
- regcache_cooked_write_unsigned (current_regcache, I386_EFLAGS_REGNUM,
+ regcache_cooked_write_unsigned (regcache, I386_EFLAGS_REGNUM,
eflags & ~0x0100);
request = PT_CONTINUE;
was. (If GDB wanted it to start some other way, we have already
written a new PC value to the child.) */
if (ptrace (request, pid, (caddr_t) 1,
- target_signal_to_host (signal)) == -1)
- perror_with_name ("ptrace");
+ gdb_signal_to_host (signal)) == -1)
+ perror_with_name (("ptrace"));
}
\f
+
+/* Support for debugging kernel virtual memory images. */
+
+#include <machine/pcb.h>
+
+#include "bsd-kvm.h"
+
+static int
+i386fbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
+{
+ /* The following is true for FreeBSD 4.7:
+
+ The pcb contains %eip, %ebx, %esp, %ebp, %esi, %edi and %gs.
+ This accounts for all callee-saved registers specified by the
+ psABI and then some. Here %esp contains the stack pointer at the
+ point just after the call to cpu_switch(). From this information
+ we reconstruct the register state as it would look when we just
+ returned from cpu_switch(). */
+
+ /* The stack pointer shouldn't be zero. */
+ if (pcb->pcb_esp == 0)
+ return 0;
+
+ pcb->pcb_esp += 4;
+ regcache_raw_supply (regcache, I386_EDI_REGNUM, &pcb->pcb_edi);
+ regcache_raw_supply (regcache, I386_ESI_REGNUM, &pcb->pcb_esi);
+ regcache_raw_supply (regcache, I386_EBP_REGNUM, &pcb->pcb_ebp);
+ regcache_raw_supply (regcache, I386_ESP_REGNUM, &pcb->pcb_esp);
+ regcache_raw_supply (regcache, I386_EBX_REGNUM, &pcb->pcb_ebx);
+ regcache_raw_supply (regcache, I386_EIP_REGNUM, &pcb->pcb_eip);
+ regcache_raw_supply (regcache, I386_GS_REGNUM, &pcb->pcb_gs);
+
+ return 1;
+}
+\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)
+ {
+ x86bsd_xsave_len = info.xsave_len;
+ xcr0 = info.xsave_mask;
+ }
+ xsave_probed = 1;
+ }
+
+ if (x86bsd_xsave_len != 0)
+ {
+ return i386_target_description (xcr0);
+ }
+ else
+ return tdesc_i386;
+}
+#endif
+
+/* Prevent warning from -Wmissing-prototypes. */
+void _initialize_i386fbsd_nat (void);
+
void
_initialize_i386fbsd_nat (void)
{
- /* 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
+ struct target_ops *t;
+
+ /* Add some extra features to the common *BSD/i386 target. */
+ t = i386bsd_target ();
+
+#ifdef PT_GETXSTATE_INFO
+ t->to_read_description = i386fbsd_read_description;
+#endif
+
+ t->to_resume = i386fbsd_resume;
+ fbsd_nat_add_target (t);
+
+ /* Support debugging kernel virtual memory images. */
+ bsd_kvm_add_target (i386fbsd_supply_pcb);
+
+#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];
- int 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 = ps_strings - 128;
- i386fbsd_sigtramp_end = ps_strings;
+ i386fbsd_sigtramp_start_addr = (uintptr_t) kst.ksigtramp_start;
+ i386fbsd_sigtramp_end_addr = (uintptr_t) kst.ksigtramp_end;
}
}
#endif
projects / deliverable / binutils-gdb.git / blobdiff