1 /* Native-dependent code for OpenBSD/powerpc.
3 Copyright (C) 2004, 2005, 2006, 2007 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 (int regnum
)
50 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_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 (current_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,
91 if (regnum
== -1 || getfpregs_supplies (regnum
))
95 if (ptrace (PT_GETFPREGS
, PIDGET (inferior_ptid
),
96 (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
97 perror_with_name (_("Couldn't get floating point status"));
99 ppc_supply_fpregset (&ppcobsd_fpregset
, regcache
, -1,
100 &fpregs
, sizeof fpregs
);
105 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
106 this for all registers. */
109 ppcobsd_store_registers (struct regcache
*regcache
, int regnum
)
113 if (ptrace (PT_GETREGS
, PIDGET (inferior_ptid
),
114 (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
115 perror_with_name (_("Couldn't get registers"));
117 ppc_collect_gregset (&ppcobsd_gregset
, regcache
,
118 regnum
, ®s
, sizeof regs
);
120 ppc_collect_fpregset (&ppcobsd_gregset
, regcache
,
121 regnum
, ®s
, sizeof regs
);
124 if (ptrace (PT_SETREGS
, PIDGET (inferior_ptid
),
125 (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
126 perror_with_name (_("Couldn't write registers"));
129 if (regnum
== -1 || getfpregs_supplies (regnum
))
133 if (ptrace (PT_GETFPREGS
, PIDGET (inferior_ptid
),
134 (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
135 perror_with_name (_("Couldn't get floating point status"));
137 ppc_collect_fpregset (&ppcobsd_fpregset
, regcache
,
138 regnum
, &fpregs
, sizeof fpregs
);
140 if (ptrace (PT_SETFPREGS
, PIDGET (inferior_ptid
),
141 (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
142 perror_with_name (_("Couldn't write floating point status"));
149 ppcobsd_supply_pcb (struct regcache
*regcache
, struct pcb
*pcb
)
151 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
152 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
153 struct switchframe sf
;
157 /* The following is true for OpenBSD 3.7:
159 The pcb contains %r1 (the stack pointer) at the point of the
160 context switch in cpu_switch(). At that point we have a stack
161 frame as described by `struct switchframe', and below that a call
162 frame as described by `struct callframe'. From this information
163 we reconstruct the register state as it would look when we are in
166 /* The stack pointer shouldn't be zero. */
167 if (pcb
->pcb_sp
== 0)
170 read_memory (pcb
->pcb_sp
, (gdb_byte
*)&sf
, sizeof sf
);
171 regcache_raw_supply (regcache
, gdbarch_sp_regnum (gdbarch
), &sf
.sp
);
172 regcache_raw_supply (regcache
, tdep
->ppc_cr_regnum
, &sf
.cr
);
173 regcache_raw_supply (regcache
, tdep
->ppc_gp0_regnum
+ 2, &sf
.fixreg2
);
174 for (i
= 0, regnum
= tdep
->ppc_gp0_regnum
+ 13; i
< 19; i
++, regnum
++)
175 regcache_raw_supply (regcache
, regnum
, &sf
.fixreg
[i
]);
177 read_memory (sf
.sp
, (gdb_byte
*)&cf
, sizeof cf
);
178 regcache_raw_supply (regcache
, gdbarch_pc_regnum (gdbarch
), &cf
.lr
);
179 regcache_raw_supply (regcache
, tdep
->ppc_gp0_regnum
+ 30, &cf
.r30
);
180 regcache_raw_supply (regcache
, tdep
->ppc_gp0_regnum
+ 31, &cf
.r31
);
186 /* Provide a prototype to silence -Wmissing-prototypes. */
187 void _initialize_ppcobsd_nat (void);
190 _initialize_ppcobsd_nat (void)
192 struct target_ops
*t
;
194 /* Add in local overrides. */
195 t
= inf_ptrace_target ();
196 t
->to_fetch_registers
= ppcobsd_fetch_registers
;
197 t
->to_store_registers
= ppcobsd_store_registers
;
200 /* General-purpose registers. */
201 ppcobsd_reg_offsets
.r0_offset
= offsetof (struct reg
, gpr
);
202 ppcobsd_reg_offsets
.gpr_size
= 4;
203 ppcobsd_reg_offsets
.xr_size
= 4;
204 ppcobsd_reg_offsets
.pc_offset
= offsetof (struct reg
, pc
);
205 ppcobsd_reg_offsets
.ps_offset
= offsetof (struct reg
, ps
);
206 ppcobsd_reg_offsets
.cr_offset
= offsetof (struct reg
, cnd
);
207 ppcobsd_reg_offsets
.lr_offset
= offsetof (struct reg
, lr
);
208 ppcobsd_reg_offsets
.ctr_offset
= offsetof (struct reg
, cnt
);
209 ppcobsd_reg_offsets
.xer_offset
= offsetof (struct reg
, xer
);
210 ppcobsd_reg_offsets
.mq_offset
= offsetof (struct reg
, mq
);
212 /* Floating-point registers. */
213 ppcobsd_reg_offsets
.f0_offset
= offsetof (struct reg
, fpr
);
214 ppcobsd_reg_offsets
.fpscr_offset
= -1;
216 ppcobsd_fpreg_offsets
.f0_offset
= offsetof (struct fpreg
, fpr
);
217 ppcobsd_fpreg_offsets
.fpscr_offset
= offsetof (struct fpreg
, fpscr
);
218 ppcobsd_fpreg_offsets
.fpscr_size
= 4;
221 /* AltiVec registers. */
222 ppcobsd_reg_offsets
.vr0_offset
= offsetof (struct vreg
, vreg
);
223 ppcobsd_reg_offsets
.vscr_offset
= offsetof (struct vreg
, vscr
);
224 ppcobsd_reg_offsets
.vrsave_offset
= offsetof (struct vreg
, vrsave
);
226 /* Support debugging kernel virtual memory images. */
227 bsd_kvm_add_target (ppcobsd_supply_pcb
);
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