/* Native-dependent code for OpenBSD/powerpc.
- Copyright 2004 Free Software Foundation, Inc.
+ Copyright (C) 2004, 2005, 2006, 2007 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 "inferior.h"
#include "regcache.h"
+#include "gdb_assert.h"
#include <stddef.h>
#include <sys/types.h>
#include <sys/ptrace.h>
+#include <sys/signal.h>
+#include <machine/frame.h>
+#include <machine/pcb.h>
#include <machine/reg.h>
#include "ppc-tdep.h"
#include "ppcobsd-tdep.h"
+#include "inf-ptrace.h"
+#include "bsd-kvm.h"
-/* OpenBSD/powerpc doesn't have PT_GETFPREGS/PT_SETFPREGS like
- NetBSD/powerpc and FreeBSD/powerpc. */
+/* OpenBSD/powerpc didn't have PT_GETFPREGS/PT_SETFPREGS until release
+ 4.0. On older releases the floating-point registers are handled by
+ PT_GETREGS/PT_SETREGS, but fpscr wasn't available.. */
+
+#ifdef PT_GETFPREGS
+
+/* Returns true if PT_GETFPREGS fetches this register. */
+
+static int
+getfpregs_supplies (int regnum)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
+
+ /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
+ point registers. Traditionally, GDB's register set has still
+ listed the floating point registers for such machines, so this
+ code is harmless. However, the new E500 port actually omits the
+ floating point registers entirely from the register set --- they
+ don't even have register numbers assigned to them.
+
+ It's not clear to me how best to update this code, so this assert
+ will alert the first person to encounter the NetBSD/E500
+ combination to the problem. */
+ gdb_assert (ppc_floating_point_unit_p (current_gdbarch));
+
+ return ((regnum >= tdep->ppc_fp0_regnum
+ && regnum < tdep->ppc_fp0_regnum + ppc_num_fprs)
+ || regnum == tdep->ppc_fpscr_regnum);
+}
+
+#endif /* PT_GETFPREGS */
/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
for all registers. */
-void
-fetch_inferior_registers (int regnum)
+static void
+ppcobsd_fetch_registers (struct regcache *regcache, int regnum)
{
struct reg regs;
if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
- (PTRACE_ARG3_TYPE) ®s, 0) == -1)
- perror_with_name ("Couldn't get registers");
-
- ppcobsd_supply_gregset (&ppcobsd_gregset, current_regcache, -1,
- ®s, sizeof regs);
+ (PTRACE_TYPE_ARG3) ®s, 0) == -1)
+ perror_with_name (_("Couldn't get registers"));
+
+ ppc_supply_gregset (&ppcobsd_gregset, regcache, -1,
+ ®s, sizeof regs);
+#ifndef PT_GETFPREGS
+ ppc_supply_fpregset (&ppcobsd_gregset, regcache, -1,
+ ®s, sizeof regs);
+#endif
+
+#ifdef PT_GETFPREGS
+ if (regnum == -1 || getfpregs_supplies (regnum))
+ {
+ struct fpreg fpregs;
+
+ if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+ perror_with_name (_("Couldn't get floating point status"));
+
+ ppc_supply_fpregset (&ppcobsd_fpregset, regcache, -1,
+ &fpregs, sizeof fpregs);
+ }
+#endif
}
/* Store register REGNUM back into the inferior. If REGNUM is -1, do
this for all registers. */
-void
-store_inferior_registers (int regnum)
+static void
+ppcobsd_store_registers (struct regcache *regcache, int regnum)
{
struct reg regs;
if (ptrace (PT_GETREGS, PIDGET (inferior_ptid),
- (PTRACE_ARG3_TYPE) ®s, 0) == -1)
- perror_with_name ("Couldn't get registers");
+ (PTRACE_TYPE_ARG3) ®s, 0) == -1)
+ perror_with_name (_("Couldn't get registers"));
- ppcobsd_collect_gregset (&ppcobsd_gregset, current_regcache,
- regnum, ®s, sizeof regs);
+ ppc_collect_gregset (&ppcobsd_gregset, regcache,
+ regnum, ®s, sizeof regs);
+#ifndef PT_GETFPREGS
+ ppc_collect_fpregset (&ppcobsd_gregset, regcache,
+ regnum, ®s, sizeof regs);
+#endif
if (ptrace (PT_SETREGS, PIDGET (inferior_ptid),
- (PTRACE_ARG3_TYPE) ®s, 0) == -1)
- perror_with_name ("Couldn't write registers");
+ (PTRACE_TYPE_ARG3) ®s, 0) == -1)
+ perror_with_name (_("Couldn't write registers"));
+
+#ifdef PT_GETFPREGS
+ if (regnum == -1 || getfpregs_supplies (regnum))
+ {
+ struct fpreg fpregs;
+
+ if (ptrace (PT_GETFPREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+ perror_with_name (_("Couldn't get floating point status"));
+
+ ppc_collect_fpregset (&ppcobsd_fpregset, regcache,
+ regnum, &fpregs, sizeof fpregs);
+
+ if (ptrace (PT_SETFPREGS, PIDGET (inferior_ptid),
+ (PTRACE_TYPE_ARG3) &fpregs, 0) == -1)
+ perror_with_name (_("Couldn't write floating point status"));
+ }
+#endif
+}
+\f
+
+static int
+ppcobsd_supply_pcb (struct regcache *regcache, struct pcb *pcb)
+{
+ struct gdbarch_tdep *tdep = gdbarch_tdep (get_regcache_arch (regcache));
+ struct switchframe sf;
+ struct callframe cf;
+ int i, regnum;
+
+ /* The following is true for OpenBSD 3.7:
+
+ The pcb contains %r1 (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', and below that a call
+ frame as described by `struct callframe'. From this information
+ we reconstruct the register state as it would look when we are in
+ cpu_switch(). */
+
+ /* The stack pointer shouldn't be zero. */
+ if (pcb->pcb_sp == 0)
+ return 0;
+
+ read_memory (pcb->pcb_sp, (gdb_byte *)&sf, sizeof sf);
+ regcache_raw_supply (regcache, SP_REGNUM, &sf.sp);
+ regcache_raw_supply (regcache, tdep->ppc_cr_regnum, &sf.cr);
+ regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 2, &sf.fixreg2);
+ for (i = 0, regnum = tdep->ppc_gp0_regnum + 13; i < 19; i++, regnum++)
+ regcache_raw_supply (regcache, regnum, &sf.fixreg[i]);
+
+ read_memory (sf.sp, (gdb_byte *)&cf, sizeof cf);
+ regcache_raw_supply (regcache, PC_REGNUM, &cf.lr);
+ regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 30, &cf.r30);
+ regcache_raw_supply (regcache, tdep->ppc_gp0_regnum + 31, &cf.r31);
+
+ return 1;
}
\f
void
_initialize_ppcobsd_nat (void)
{
+ struct target_ops *t;
+
+ /* Add in local overrides. */
+ t = inf_ptrace_target ();
+ t->to_fetch_registers = ppcobsd_fetch_registers;
+ t->to_store_registers = ppcobsd_store_registers;
+ add_target (t);
+
/* General-purpose registers. */
ppcobsd_reg_offsets.r0_offset = offsetof (struct reg, gpr);
ppcobsd_reg_offsets.pc_offset = offsetof (struct reg, pc);
/* Floating-point registers. */
ppcobsd_reg_offsets.f0_offset = offsetof (struct reg, fpr);
ppcobsd_reg_offsets.fpscr_offset = -1;
+#ifdef PT_GETFPREGS
+ ppcobsd_fpreg_offsets.f0_offset = offsetof (struct fpreg, fpr);
+ ppcobsd_fpreg_offsets.fpscr_offset = offsetof (struct fpreg, fpscr);
+#endif
/* AltiVec registers. */
ppcobsd_reg_offsets.vr0_offset = offsetof (struct vreg, vreg);
ppcobsd_reg_offsets.vscr_offset = offsetof (struct vreg, vscr);
ppcobsd_reg_offsets.vrsave_offset = offsetof (struct vreg, vrsave);
+
+ /* Support debugging kernel virtual memory images. */
+ bsd_kvm_add_target (ppcobsd_supply_pcb);
}
projects / deliverable / binutils-gdb.git / blobdiff