1 /* Native-dependent code for OpenBSD/powerpc.
3 Copyright (C) 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
25 #include "gdb_assert.h"
27 #include <sys/types.h>
28 #include <sys/ptrace.h>
29 #include <sys/signal.h>
30 #include <machine/frame.h>
31 #include <machine/pcb.h>
32 #include <machine/reg.h>
35 #include "ppcobsd-tdep.h"
36 #include "inf-ptrace.h"
39 /* OpenBSD/powerpc didn't have PT_GETFPREGS/PT_SETFPREGS until release
40 4.0. On older releases the floating-point registers are handled by
41 PT_GETREGS/PT_SETREGS, but fpscr wasn't available.. */
45 /* Returns true if PT_GETFPREGS fetches this register. */
48 getfpregs_supplies (struct gdbarch
*gdbarch
, int regnum
)
50 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
52 /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
53 point registers. Traditionally, GDB's register set has still
54 listed the floating point registers for such machines, so this
55 code is harmless. However, the new E500 port actually omits the
56 floating point registers entirely from the register set --- they
57 don't even have register numbers assigned to them.
59 It's not clear to me how best to update this code, so this assert
60 will alert the first person to encounter the NetBSD/E500
61 combination to the problem. */
62 gdb_assert (ppc_floating_point_unit_p (gdbarch
));
64 return ((regnum
>= tdep
->ppc_fp0_regnum
65 && regnum
< tdep
->ppc_fp0_regnum
+ ppc_num_fprs
)
66 || regnum
== tdep
->ppc_fpscr_regnum
);
69 #endif /* PT_GETFPREGS */
71 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
75 ppcobsd_fetch_registers (struct regcache
*regcache
, int regnum
)
79 if (ptrace (PT_GETREGS
, PIDGET (inferior_ptid
),
80 (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
81 perror_with_name (_("Couldn't get registers"));
83 ppc_supply_gregset (&ppcobsd_gregset
, regcache
, -1,
86 ppc_supply_fpregset (&ppcobsd_gregset
, regcache
, -1,
92 || getfpregs_supplies (get_regcache_arch (regcache
), regnum
))
96 if (ptrace (PT_GETFPREGS
, PIDGET (inferior_ptid
),
97 (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
98 perror_with_name (_("Couldn't get floating point status"));
100 ppc_supply_fpregset (&ppcobsd_fpregset
, regcache
, -1,
101 &fpregs
, sizeof fpregs
);
106 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
107 this for all registers. */
110 ppcobsd_store_registers (struct regcache
*regcache
, int regnum
)
114 if (ptrace (PT_GETREGS
, PIDGET (inferior_ptid
),
115 (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
116 perror_with_name (_("Couldn't get registers"));
118 ppc_collect_gregset (&ppcobsd_gregset
, regcache
,
119 regnum
, ®s
, sizeof regs
);
121 ppc_collect_fpregset (&ppcobsd_gregset
, regcache
,
122 regnum
, ®s
, sizeof regs
);
125 if (ptrace (PT_SETREGS
, PIDGET (inferior_ptid
),
126 (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
127 perror_with_name (_("Couldn't write registers"));
131 || getfpregs_supplies (get_regcache_arch (regcache
), regnum
))
135 if (ptrace (PT_GETFPREGS
, PIDGET (inferior_ptid
),
136 (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
137 perror_with_name (_("Couldn't get floating point status"));
139 ppc_collect_fpregset (&ppcobsd_fpregset
, regcache
,
140 regnum
, &fpregs
, sizeof fpregs
);
142 if (ptrace (PT_SETFPREGS
, PIDGET (inferior_ptid
),
143 (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
144 perror_with_name (_("Couldn't write floating point status"));
151 ppcobsd_supply_pcb (struct regcache
*regcache
, struct pcb
*pcb
)
153 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
154 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
155 struct switchframe sf
;
159 /* The following is true for OpenBSD 3.7:
161 The pcb contains %r1 (the stack pointer) at the point of the
162 context switch in cpu_switch(). At that point we have a stack
163 frame as described by `struct switchframe', and below that a call
164 frame as described by `struct callframe'. From this information
165 we reconstruct the register state as it would look when we are in
168 /* The stack pointer shouldn't be zero. */
169 if (pcb
->pcb_sp
== 0)
172 read_memory (pcb
->pcb_sp
, (gdb_byte
*)&sf
, sizeof sf
);
173 regcache_raw_supply (regcache
, gdbarch_sp_regnum (gdbarch
), &sf
.sp
);
174 regcache_raw_supply (regcache
, tdep
->ppc_cr_regnum
, &sf
.cr
);
175 regcache_raw_supply (regcache
, tdep
->ppc_gp0_regnum
+ 2, &sf
.fixreg2
);
176 for (i
= 0, regnum
= tdep
->ppc_gp0_regnum
+ 13; i
< 19; i
++, regnum
++)
177 regcache_raw_supply (regcache
, regnum
, &sf
.fixreg
[i
]);
179 read_memory (sf
.sp
, (gdb_byte
*)&cf
, sizeof cf
);
180 regcache_raw_supply (regcache
, gdbarch_pc_regnum (gdbarch
), &cf
.lr
);
181 regcache_raw_supply (regcache
, tdep
->ppc_gp0_regnum
+ 30, &cf
.r30
);
182 regcache_raw_supply (regcache
, tdep
->ppc_gp0_regnum
+ 31, &cf
.r31
);
188 /* Provide a prototype to silence -Wmissing-prototypes. */
189 void _initialize_ppcobsd_nat (void);
192 _initialize_ppcobsd_nat (void)
194 struct target_ops
*t
;
196 /* Add in local overrides. */
197 t
= inf_ptrace_target ();
198 t
->to_fetch_registers
= ppcobsd_fetch_registers
;
199 t
->to_store_registers
= ppcobsd_store_registers
;
202 /* General-purpose registers. */
203 ppcobsd_reg_offsets
.r0_offset
= offsetof (struct reg
, gpr
);
204 ppcobsd_reg_offsets
.gpr_size
= 4;
205 ppcobsd_reg_offsets
.xr_size
= 4;
206 ppcobsd_reg_offsets
.pc_offset
= offsetof (struct reg
, pc
);
207 ppcobsd_reg_offsets
.ps_offset
= offsetof (struct reg
, ps
);
208 ppcobsd_reg_offsets
.cr_offset
= offsetof (struct reg
, cnd
);
209 ppcobsd_reg_offsets
.lr_offset
= offsetof (struct reg
, lr
);
210 ppcobsd_reg_offsets
.ctr_offset
= offsetof (struct reg
, cnt
);
211 ppcobsd_reg_offsets
.xer_offset
= offsetof (struct reg
, xer
);
212 ppcobsd_reg_offsets
.mq_offset
= offsetof (struct reg
, mq
);
214 /* Floating-point registers. */
215 ppcobsd_reg_offsets
.f0_offset
= offsetof (struct reg
, fpr
);
216 ppcobsd_reg_offsets
.fpscr_offset
= -1;
218 ppcobsd_fpreg_offsets
.f0_offset
= offsetof (struct fpreg
, fpr
);
219 ppcobsd_fpreg_offsets
.fpscr_offset
= offsetof (struct fpreg
, fpscr
);
220 ppcobsd_fpreg_offsets
.fpscr_size
= 4;
223 /* AltiVec registers. */
224 ppcobsd_reg_offsets
.vr0_offset
= offsetof (struct vreg
, vreg
);
225 ppcobsd_reg_offsets
.vscr_offset
= offsetof (struct vreg
, vscr
);
226 ppcobsd_reg_offsets
.vrsave_offset
= offsetof (struct vreg
, vrsave
);
228 /* Support debugging kernel virtual memory images. */
229 bsd_kvm_add_target (ppcobsd_supply_pcb
);
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