1 /* Native-dependent code for OpenBSD/powerpc.
3 Copyright (C) 2004-2016 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 <sys/types.h>
26 #include <sys/ptrace.h>
27 #include <sys/signal.h>
28 #include <machine/frame.h>
29 #include <machine/pcb.h>
30 #include <machine/reg.h>
33 #include "ppcobsd-tdep.h"
34 #include "inf-ptrace.h"
38 /* OpenBSD/powerpc didn't have PT_GETFPREGS/PT_SETFPREGS until release
39 4.0. On older releases the floating-point registers are handled by
40 PT_GETREGS/PT_SETREGS, but fpscr wasn't available.. */
44 /* Returns true if PT_GETFPREGS fetches this register. */
47 getfpregs_supplies (struct gdbarch
*gdbarch
, int regnum
)
49 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
51 /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
52 point registers. Traditionally, GDB's register set has still
53 listed the floating point registers for such machines, so this
54 code is harmless. However, the new E500 port actually omits the
55 floating point registers entirely from the register set --- they
56 don't even have register numbers assigned to them.
58 It's not clear to me how best to update this code, so this assert
59 will alert the first person to encounter the NetBSD/E500
60 combination to the problem. */
61 gdb_assert (ppc_floating_point_unit_p (gdbarch
));
63 return ((regnum
>= tdep
->ppc_fp0_regnum
64 && regnum
< tdep
->ppc_fp0_regnum
+ ppc_num_fprs
)
65 || regnum
== tdep
->ppc_fpscr_regnum
);
68 #endif /* PT_GETFPREGS */
70 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
74 ppcobsd_fetch_registers (struct target_ops
*ops
,
75 struct regcache
*regcache
, int regnum
)
79 if (ptrace (PT_GETREGS
, ptid_get_pid (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
, ptid_get_pid (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 target_ops
*ops
,
111 struct regcache
*regcache
, int regnum
)
115 if (ptrace (PT_GETREGS
, ptid_get_pid (inferior_ptid
),
116 (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
117 perror_with_name (_("Couldn't get registers"));
119 ppc_collect_gregset (&ppcobsd_gregset
, regcache
,
120 regnum
, ®s
, sizeof regs
);
122 ppc_collect_fpregset (&ppcobsd_gregset
, regcache
,
123 regnum
, ®s
, sizeof regs
);
126 if (ptrace (PT_SETREGS
, ptid_get_pid (inferior_ptid
),
127 (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
128 perror_with_name (_("Couldn't write registers"));
132 || getfpregs_supplies (get_regcache_arch (regcache
), regnum
))
136 if (ptrace (PT_GETFPREGS
, ptid_get_pid (inferior_ptid
),
137 (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
138 perror_with_name (_("Couldn't get floating point status"));
140 ppc_collect_fpregset (&ppcobsd_fpregset
, regcache
,
141 regnum
, &fpregs
, sizeof fpregs
);
143 if (ptrace (PT_SETFPREGS
, ptid_get_pid (inferior_ptid
),
144 (PTRACE_TYPE_ARG3
) &fpregs
, 0) == -1)
145 perror_with_name (_("Couldn't write floating point status"));
152 ppcobsd_supply_pcb (struct regcache
*regcache
, struct pcb
*pcb
)
154 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
155 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
156 struct switchframe sf
;
160 /* The following is true for OpenBSD 3.7:
162 The pcb contains %r1 (the stack pointer) at the point of the
163 context switch in cpu_switch(). At that point we have a stack
164 frame as described by `struct switchframe', and below that a call
165 frame as described by `struct callframe'. From this information
166 we reconstruct the register state as it would look when we are in
169 /* The stack pointer shouldn't be zero. */
170 if (pcb
->pcb_sp
== 0)
173 read_memory (pcb
->pcb_sp
, (gdb_byte
*)&sf
, sizeof sf
);
174 regcache_raw_supply (regcache
, gdbarch_sp_regnum (gdbarch
), &sf
.sp
);
175 regcache_raw_supply (regcache
, tdep
->ppc_cr_regnum
, &sf
.cr
);
176 regcache_raw_supply (regcache
, tdep
->ppc_gp0_regnum
+ 2, &sf
.fixreg2
);
177 for (i
= 0, regnum
= tdep
->ppc_gp0_regnum
+ 13; i
< 19; i
++, regnum
++)
178 regcache_raw_supply (regcache
, regnum
, &sf
.fixreg
[i
]);
180 read_memory (sf
.sp
, (gdb_byte
*)&cf
, sizeof cf
);
181 regcache_raw_supply (regcache
, gdbarch_pc_regnum (gdbarch
), &cf
.lr
);
182 regcache_raw_supply (regcache
, tdep
->ppc_gp0_regnum
+ 30, &cf
.r30
);
183 regcache_raw_supply (regcache
, tdep
->ppc_gp0_regnum
+ 31, &cf
.r31
);
189 /* Provide a prototype to silence -Wmissing-prototypes. */
190 void _initialize_ppcobsd_nat (void);
193 _initialize_ppcobsd_nat (void)
195 struct target_ops
*t
;
197 /* Add in local overrides. */
198 t
= inf_ptrace_target ();
199 t
->to_fetch_registers
= ppcobsd_fetch_registers
;
200 t
->to_store_registers
= ppcobsd_store_registers
;
203 /* General-purpose registers. */
204 ppcobsd_reg_offsets
.r0_offset
= offsetof (struct reg
, gpr
);
205 ppcobsd_reg_offsets
.gpr_size
= 4;
206 ppcobsd_reg_offsets
.xr_size
= 4;
207 ppcobsd_reg_offsets
.pc_offset
= offsetof (struct reg
, pc
);
208 ppcobsd_reg_offsets
.ps_offset
= offsetof (struct reg
, ps
);
209 ppcobsd_reg_offsets
.cr_offset
= offsetof (struct reg
, cnd
);
210 ppcobsd_reg_offsets
.lr_offset
= offsetof (struct reg
, lr
);
211 ppcobsd_reg_offsets
.ctr_offset
= offsetof (struct reg
, cnt
);
212 ppcobsd_reg_offsets
.xer_offset
= offsetof (struct reg
, xer
);
213 ppcobsd_reg_offsets
.mq_offset
= offsetof (struct reg
, mq
);
215 /* Floating-point registers. */
216 ppcobsd_reg_offsets
.f0_offset
= offsetof (struct reg
, fpr
);
217 ppcobsd_reg_offsets
.fpscr_offset
= -1;
219 ppcobsd_fpreg_offsets
.f0_offset
= offsetof (struct fpreg
, fpr
);
220 ppcobsd_fpreg_offsets
.fpscr_offset
= offsetof (struct fpreg
, fpscr
);
221 ppcobsd_fpreg_offsets
.fpscr_size
= 4;
224 /* AltiVec registers. */
225 ppcobsd_reg_offsets
.vr0_offset
= offsetof (struct vreg
, vreg
);
226 ppcobsd_reg_offsets
.vscr_offset
= offsetof (struct vreg
, vscr
);
227 ppcobsd_reg_offsets
.vrsave_offset
= offsetof (struct vreg
, vrsave
);
229 /* Support debugging kernel virtual memory images. */
230 bsd_kvm_add_target (ppcobsd_supply_pcb
);
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