1 /* Native-dependent code for OpenBSD/powerpc.
3 Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
26 #include "gdb_assert.h"
28 #include <sys/types.h>
29 #include <sys/ptrace.h>
30 #include <sys/signal.h>
31 #include <machine/frame.h>
32 #include <machine/pcb.h>
33 #include <machine/reg.h>
36 #include "ppcobsd-tdep.h"
37 #include "inf-ptrace.h"
40 /* OpenBSD/powerpc didn't have PT_GETFPREGS/PT_SETFPREGS until release
41 4.0. On older releases the floating-point registers are handled by
42 PT_GETREGS/PT_SETREGS, but fpscr wasn't available.. */
46 /* Returns true if PT_GETFPREGS fetches this register. */
49 getfpregs_supplies (struct gdbarch
*gdbarch
, int regnum
)
51 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
53 /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
54 point registers. Traditionally, GDB's register set has still
55 listed the floating point registers for such machines, so this
56 code is harmless. However, the new E500 port actually omits the
57 floating point registers entirely from the register set --- they
58 don't even have register numbers assigned to them.
60 It's not clear to me how best to update this code, so this assert
61 will alert the first person to encounter the NetBSD/E500
62 combination to the problem. */
63 gdb_assert (ppc_floating_point_unit_p (gdbarch
));
65 return ((regnum
>= tdep
->ppc_fp0_regnum
66 && regnum
< tdep
->ppc_fp0_regnum
+ ppc_num_fprs
)
67 || regnum
== tdep
->ppc_fpscr_regnum
);
70 #endif /* PT_GETFPREGS */
72 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
76 ppcobsd_fetch_registers (struct target_ops
*ops
,
77 struct regcache
*regcache
, int regnum
)
81 if (ptrace (PT_GETREGS
, PIDGET (inferior_ptid
),
82 (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
83 perror_with_name (_("Couldn't get registers"));
85 ppc_supply_gregset (&ppcobsd_gregset
, regcache
, -1,
88 ppc_supply_fpregset (&ppcobsd_gregset
, regcache
, -1,
94 || getfpregs_supplies (get_regcache_arch (regcache
), regnum
))
98 if (ptrace (PT_GETFPREGS
, PIDGET (inferior_ptid
),
99 (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
100 perror_with_name (_("Couldn't get floating point status"));
102 ppc_supply_fpregset (&ppcobsd_fpregset
, regcache
, -1,
103 &fpregs
, sizeof fpregs
);
108 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
109 this for all registers. */
112 ppcobsd_store_registers (struct target_ops
*ops
,
113 struct regcache
*regcache
, int regnum
)
117 if (ptrace (PT_GETREGS
, PIDGET (inferior_ptid
),
118 (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
119 perror_with_name (_("Couldn't get registers"));
121 ppc_collect_gregset (&ppcobsd_gregset
, regcache
,
122 regnum
, ®s
, sizeof regs
);
124 ppc_collect_fpregset (&ppcobsd_gregset
, regcache
,
125 regnum
, ®s
, sizeof regs
);
128 if (ptrace (PT_SETREGS
, PIDGET (inferior_ptid
),
129 (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
130 perror_with_name (_("Couldn't write registers"));
134 || getfpregs_supplies (get_regcache_arch (regcache
), regnum
))
138 if (ptrace (PT_GETFPREGS
, PIDGET (inferior_ptid
),
139 (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
140 perror_with_name (_("Couldn't get floating point status"));
142 ppc_collect_fpregset (&ppcobsd_fpregset
, regcache
,
143 regnum
, &fpregs
, sizeof fpregs
);
145 if (ptrace (PT_SETFPREGS
, PIDGET (inferior_ptid
),
146 (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
147 perror_with_name (_("Couldn't write floating point status"));
154 ppcobsd_supply_pcb (struct regcache
*regcache
, struct pcb
*pcb
)
156 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
157 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
158 struct switchframe sf
;
162 /* The following is true for OpenBSD 3.7:
164 The pcb contains %r1 (the stack pointer) at the point of the
165 context switch in cpu_switch(). At that point we have a stack
166 frame as described by `struct switchframe', and below that a call
167 frame as described by `struct callframe'. From this information
168 we reconstruct the register state as it would look when we are in
171 /* The stack pointer shouldn't be zero. */
172 if (pcb
->pcb_sp
== 0)
175 read_memory (pcb
->pcb_sp
, (gdb_byte
*)&sf
, sizeof sf
);
176 regcache_raw_supply (regcache
, gdbarch_sp_regnum (gdbarch
), &sf
.sp
);
177 regcache_raw_supply (regcache
, tdep
->ppc_cr_regnum
, &sf
.cr
);
178 regcache_raw_supply (regcache
, tdep
->ppc_gp0_regnum
+ 2, &sf
.fixreg2
);
179 for (i
= 0, regnum
= tdep
->ppc_gp0_regnum
+ 13; i
< 19; i
++, regnum
++)
180 regcache_raw_supply (regcache
, regnum
, &sf
.fixreg
[i
]);
182 read_memory (sf
.sp
, (gdb_byte
*)&cf
, sizeof cf
);
183 regcache_raw_supply (regcache
, gdbarch_pc_regnum (gdbarch
), &cf
.lr
);
184 regcache_raw_supply (regcache
, tdep
->ppc_gp0_regnum
+ 30, &cf
.r30
);
185 regcache_raw_supply (regcache
, tdep
->ppc_gp0_regnum
+ 31, &cf
.r31
);
191 /* Provide a prototype to silence -Wmissing-prototypes. */
192 void _initialize_ppcobsd_nat (void);
195 _initialize_ppcobsd_nat (void)
197 struct target_ops
*t
;
199 /* Add in local overrides. */
200 t
= inf_ptrace_target ();
201 t
->to_fetch_registers
= ppcobsd_fetch_registers
;
202 t
->to_store_registers
= ppcobsd_store_registers
;
205 /* General-purpose registers. */
206 ppcobsd_reg_offsets
.r0_offset
= offsetof (struct reg
, gpr
);
207 ppcobsd_reg_offsets
.gpr_size
= 4;
208 ppcobsd_reg_offsets
.xr_size
= 4;
209 ppcobsd_reg_offsets
.pc_offset
= offsetof (struct reg
, pc
);
210 ppcobsd_reg_offsets
.ps_offset
= offsetof (struct reg
, ps
);
211 ppcobsd_reg_offsets
.cr_offset
= offsetof (struct reg
, cnd
);
212 ppcobsd_reg_offsets
.lr_offset
= offsetof (struct reg
, lr
);
213 ppcobsd_reg_offsets
.ctr_offset
= offsetof (struct reg
, cnt
);
214 ppcobsd_reg_offsets
.xer_offset
= offsetof (struct reg
, xer
);
215 ppcobsd_reg_offsets
.mq_offset
= offsetof (struct reg
, mq
);
217 /* Floating-point registers. */
218 ppcobsd_reg_offsets
.f0_offset
= offsetof (struct reg
, fpr
);
219 ppcobsd_reg_offsets
.fpscr_offset
= -1;
221 ppcobsd_fpreg_offsets
.f0_offset
= offsetof (struct fpreg
, fpr
);
222 ppcobsd_fpreg_offsets
.fpscr_offset
= offsetof (struct fpreg
, fpscr
);
223 ppcobsd_fpreg_offsets
.fpscr_size
= 4;
226 /* AltiVec registers. */
227 ppcobsd_reg_offsets
.vr0_offset
= offsetof (struct vreg
, vreg
);
228 ppcobsd_reg_offsets
.vscr_offset
= offsetof (struct vreg
, vscr
);
229 ppcobsd_reg_offsets
.vrsave_offset
= offsetof (struct vreg
, vrsave
);
231 /* Support debugging kernel virtual memory images. */
232 bsd_kvm_add_target (ppcobsd_supply_pcb
);
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