/* Native-dependent code for FreeBSD/amd64.
- Copyright 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2003-2015 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 "gdb_assert.h"
#include <signal.h>
-#include <stddef.h>
#include <sys/types.h>
#include <sys/ptrace.h>
#include <sys/sysctl.h>
+#include <sys/user.h>
#include <machine/reg.h>
+#include "fbsd-nat.h"
#include "amd64-tdep.h"
#include "amd64-nat.h"
+#include "amd64bsd-nat.h"
+#include "x86-nat.h"
\f
/* Offset in `struct reg' where MEMBER is stored. */
};
\f
+/* Support for debugging kernel virtual memory images. */
+
+#include <machine/pcb.h>
+#include <osreldate.h>
+
+#include "bsd-kvm.h"
+
+static int
+amd64fbsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
+{
+ /* The following is true for FreeBSD 5.2:
+
+ The pcb contains %rip, %rbx, %rsp, %rbp, %r12, %r13, %r14, %r15,
+ %ds, %es, %fs 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 like when we just returned from cpu_switch(). */
+
+ /* The stack pointer shouldn't be zero. */
+ if (pcb->pcb_rsp == 0)
+ return 0;
+
+ pcb->pcb_rsp += 8;
+ regcache_raw_supply (regcache, AMD64_RIP_REGNUM, &pcb->pcb_rip);
+ regcache_raw_supply (regcache, AMD64_RBX_REGNUM, &pcb->pcb_rbx);
+ regcache_raw_supply (regcache, AMD64_RSP_REGNUM, &pcb->pcb_rsp);
+ regcache_raw_supply (regcache, AMD64_RBP_REGNUM, &pcb->pcb_rbp);
+ regcache_raw_supply (regcache, 12, &pcb->pcb_r12);
+ regcache_raw_supply (regcache, 13, &pcb->pcb_r13);
+ regcache_raw_supply (regcache, 14, &pcb->pcb_r14);
+ regcache_raw_supply (regcache, 15, &pcb->pcb_r15);
+#if (__FreeBSD_version < 800075) && (__FreeBSD_kernel_version < 800075)
+ /* struct pcb provides the pcb_ds/pcb_es/pcb_fs/pcb_gs fields only
+ up until __FreeBSD_version 800074: The removal of these fields
+ occurred on 2009-04-01 while the __FreeBSD_version number was
+ bumped to 800075 on 2009-04-06. So 800075 is the closest version
+ number where we should not try to access these fields. */
+ regcache_raw_supply (regcache, AMD64_DS_REGNUM, &pcb->pcb_ds);
+ regcache_raw_supply (regcache, AMD64_ES_REGNUM, &pcb->pcb_es);
+ regcache_raw_supply (regcache, AMD64_FS_REGNUM, &pcb->pcb_fs);
+ regcache_raw_supply (regcache, AMD64_GS_REGNUM, &pcb->pcb_gs);
+#endif
+
+ return 1;
+}
+\f
+
+static void (*super_mourn_inferior) (struct target_ops *ops);
+
+static void
+amd64fbsd_mourn_inferior (struct target_ops *ops)
+{
+#ifdef HAVE_PT_GETDBREGS
+ x86_cleanup_dregs ();
+#endif
+ super_mourn_inferior (ops);
+}
+
+/* Implement the to_read_description method. */
+
+static const struct target_desc *
+amd64fbsd_read_description (struct target_ops *ops)
+{
+#ifdef PT_GETXSTATE_INFO
+ static int xsave_probed;
+ static uint64_t xcr0;
+#endif
+ struct reg regs;
+ int is64;
+
+ if (ptrace (PT_GETREGS, ptid_get_pid (inferior_ptid),
+ (PTRACE_TYPE_ARG3) ®s, 0) == -1)
+ perror_with_name (_("Couldn't get registers"));
+ is64 = (regs.r_cs == GSEL (GUCODE_SEL, SEL_UPL));
+#ifdef PT_GETXSTATE_INFO
+ 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)
+ {
+ amd64bsd_xsave_len = info.xsave_len;
+ xcr0 = info.xsave_mask;
+ }
+ xsave_probed = 1;
+ }
+
+ if (amd64bsd_xsave_len != 0)
+ {
+ if (is64)
+ return amd64_target_description (xcr0);
+ else
+ return i386_target_description (xcr0);
+ }
+#endif
+ if (is64)
+ return tdesc_amd64;
+ else
+ return tdesc_i386;
+}
+
/* Provide a prototype to silence -Wmissing-prototypes. */
void _initialize_amd64fbsd_nat (void);
void
_initialize_amd64fbsd_nat (void)
{
+ struct target_ops *t;
int offset;
amd64_native_gregset32_reg_offset = amd64fbsd32_r_reg_offset;
amd64_native_gregset64_reg_offset = amd64fbsd64_r_reg_offset;
+ /* Add some extra features to the common *BSD/i386 target. */
+ t = amd64bsd_target ();
+
+#ifdef HAVE_PT_GETDBREGS
+
+ x86_use_watchpoints (t);
+
+ x86_dr_low.set_control = amd64bsd_dr_set_control;
+ x86_dr_low.set_addr = amd64bsd_dr_set_addr;
+ x86_dr_low.get_addr = amd64bsd_dr_get_addr;
+ x86_dr_low.get_status = amd64bsd_dr_get_status;
+ x86_dr_low.get_control = amd64bsd_dr_get_control;
+ x86_set_debug_register_length (8);
+
+#endif /* HAVE_PT_GETDBREGS */
+
+ super_mourn_inferior = t->to_mourn_inferior;
+ t->to_mourn_inferior = amd64fbsd_mourn_inferior;
+ t->to_read_description = amd64fbsd_read_description;
+
+ fbsd_nat_add_target (t);
+
+ /* Support debugging kernel virtual memory images. */
+ bsd_kvm_add_target (amd64fbsd_supply_pcb);
+
/* To support the recognition of signal handlers, i386bsd-tdep.c
hardcodes some constants. Inclusion of this file means that we
are compiling a native debugger, which means that we can use the
if (SC_RIP_OFFSET != offset)
{
- warning ("\
+ warning (_("\
offsetof (struct sigcontext, sc_rip) yields %d instead of %d.\n\
-Please report this to <bug-gdb@gnu.org>.",
+Please report this to <bug-gdb@gnu.org>."),
offset, SC_RIP_OFFSET);
}
if (SC_RSP_OFFSET != offset)
{
- warning ("\
+ warning (_("\
offsetof (struct sigcontext, sc_rsp) yields %d instead of %d.\n\
-Please report this to <bug-gdb@gnu.org>.",
+Please report this to <bug-gdb@gnu.org>."),
offset, SC_RSP_OFFSET);
}
if (SC_RBP_OFFSET != offset)
{
- warning ("\
+ warning (_("\
offsetof (struct sigcontext, sc_rbp) yields %d instead of %d.\n\
-Please report this to <bug-gdb@gnu.org>.",
+Please report this to <bug-gdb@gnu.org>."),
offset, SC_RBP_OFFSET);
}
SC_RBP_OFFSET = offset;
- /* 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_PROC_SIGTRAMP
+ /* Normally signal frames are detected via amd64fbsd_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. Note that this only
+ works for core dumps of 64-bit (FreeBSD/amd64) processes and does
+ not handle core dumps of 32-bit (FreeBSD/i386) processes. */
{
- int mib[2];
- 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)
{
- amd64fbsd_sigtramp_start_addr = ps_strings - 32;
- amd64fbsd_sigtramp_end_addr = ps_strings;
+ amd64fbsd_sigtramp_start_addr = (uintptr_t) kst.ksigtramp_start;
+ amd64fbsd_sigtramp_end_addr = (uintptr_t) kst.ksigtramp_end;
}
}
+#endif
}
projects / deliverable / binutils-gdb.git / blobdiff