/* Native-dependent code for OpenBSD/amd64.
- Copyright 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004 Free Software Foundation, Inc.
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 "gdbcore.h"
+#include "regcache.h"
+#include "target.h"
#include "gdb_assert.h"
-#include "x86-64-tdep.h"
+#include "amd64-tdep.h"
#include "amd64-nat.h"
/* Mapping between the general-purpose registers in OpenBSD/amd64
};
\f
+/* Support for debugging kernel virtual memory images. */
+
+#include <sys/types.h>
+#include <machine/frame.h>
+#include <machine/pcb.h>
+
+#include "bsd-kvm.h"
+
+static int
+amd64obsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
+{
+ struct switchframe sf;
+ int regnum;
+
+ /* The following is true for OpenBSD 3.5:
+
+ The pcb contains the stack pointer at the point of the context
+ switch in cpu_switch(). At that point we have a stack frame as
+ described by `struct switchframe', which for OpenBSD 3.5 has the
+ following layout:
+
+ interrupt level
+ %r15
+ %r14
+ %r13
+ %r12
+ %rbp
+ %rbx
+ return address
+
+ Together with %rsp in the pcb, this accounts for all callee-saved
+ registers specified by the psABI. From this information we
+ reconstruct the register state as it would look when we just
+ returned from cpu_switch().
+
+ For core dumps the pcb is saved by savectx(). In that case the
+ stack frame only contains the return address, and there is no way
+ to recover the other registers. */
+
+ /* The stack pointer shouldn't be zero. */
+ if (pcb->pcb_rsp == 0)
+ return 0;
+
+ /* Read the stack frame, and check its validity. */
+ read_memory (pcb->pcb_rsp, (gdb_byte *) &sf, sizeof sf);
+ if (sf.sf_rbp == pcb->pcb_rbp)
+ {
+ /* Yes, we have a frame that matches cpu_switch(). */
+ pcb->pcb_rsp += sizeof (struct switchframe);
+ regcache_raw_supply (regcache, 12, &sf.sf_r12);
+ regcache_raw_supply (regcache, 13, &sf.sf_r13);
+ regcache_raw_supply (regcache, 14, &sf.sf_r14);
+ regcache_raw_supply (regcache, 15, &sf.sf_r15);
+ regcache_raw_supply (regcache, AMD64_RBX_REGNUM, &sf.sf_rbx);
+ regcache_raw_supply (regcache, AMD64_RIP_REGNUM, &sf.sf_rip);
+ }
+ else
+ {
+ /* No, the pcb must have been last updated by savectx(). */
+ pcb->pcb_rsp += 8;
+ regcache_raw_supply (regcache, AMD64_RIP_REGNUM, &sf);
+ }
+
+ regcache_raw_supply (regcache, AMD64_RSP_REGNUM, &pcb->pcb_rsp);
+ regcache_raw_supply (regcache, AMD64_RBP_REGNUM, &pcb->pcb_rbp);
+
+ return 1;
+}
+\f
+
/* Provide a prototype to silence -Wmissing-prototypes. */
void _initialize_amd64obsd_nat (void);
amd64_native_gregset32_reg_offset = amd64obsd32_r_reg_offset;
amd64_native_gregset32_num_regs = ARRAY_SIZE (amd64obsd32_r_reg_offset);
amd64_native_gregset64_reg_offset = amd64obsd_r_reg_offset;
+
+ /* We've got nothing to add to the common *BSD/amd64 target. */
+ add_target (amd64bsd_target ());
+
+ /* Support debugging kernel virtual memory images. */
+ bsd_kvm_add_target (amd64obsd_supply_pcb);
}