1 /* Native-dependent code for OpenBSD/powerpc.
3 Copyright 2004, 2005 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 2 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, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
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 doesn't have PT_GETFPREGS/PT_SETFPREGS like
41 NetBSD/powerpc and FreeBSD/powerpc. */
43 /* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
47 ppcobsd_fetch_registers (int regnum
)
51 if (ptrace (PT_GETREGS
, PIDGET (inferior_ptid
),
52 (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
53 perror_with_name (_("Couldn't get registers"));
55 ppcobsd_supply_gregset (&ppcobsd_gregset
, current_regcache
, -1,
59 /* Store register REGNUM back into the inferior. If REGNUM is -1, do
60 this for all registers. */
63 ppcobsd_store_registers (int regnum
)
67 if (ptrace (PT_GETREGS
, PIDGET (inferior_ptid
),
68 (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
69 perror_with_name (_("Couldn't get registers"));
71 ppcobsd_collect_gregset (&ppcobsd_gregset
, current_regcache
,
72 regnum
, ®s
, sizeof regs
);
74 if (ptrace (PT_SETREGS
, PIDGET (inferior_ptid
),
75 (PTRACE_TYPE_ARG3
) ®s
, 0) == -1)
76 perror_with_name (_("Couldn't write registers"));
81 ppcobsd_supply_pcb (struct regcache
*regcache
, struct pcb
*pcb
)
83 struct gdbarch_tdep
*tdep
= gdbarch_tdep (get_regcache_arch (regcache
));
84 struct switchframe sf
;
88 /* The following is true for OpenBSD 3.7:
90 The pcb contains %r1 (the stack pointer) at the point of the
91 context switch in cpu_switch(). At that point we have a stack
92 frame as described by `struct switchframe', and below that a call
93 frame as described by `struct callframe'. From this information
94 we reconstruct the register state as it would look when we are in
97 /* The stack pointer shouldn't be zero. */
101 read_memory (pcb
->pcb_sp
, (gdb_byte
*)&sf
, sizeof sf
);
102 regcache_raw_supply (regcache
, SP_REGNUM
, &sf
.sp
);
103 regcache_raw_supply (regcache
, tdep
->ppc_cr_regnum
, &sf
.cr
);
104 regcache_raw_supply (regcache
, tdep
->ppc_gp0_regnum
+ 2, &sf
.fixreg2
);
105 for (i
= 0, regnum
= tdep
->ppc_gp0_regnum
+ 13; i
< 19; i
++, regnum
++)
106 regcache_raw_supply (regcache
, regnum
, &sf
.fixreg
[i
]);
108 read_memory (sf
.sp
, (gdb_byte
*)&cf
, sizeof cf
);
109 regcache_raw_supply (regcache
, PC_REGNUM
, &cf
.lr
);
110 regcache_raw_supply (regcache
, tdep
->ppc_gp0_regnum
+ 30, &cf
.r30
);
111 regcache_raw_supply (regcache
, tdep
->ppc_gp0_regnum
+ 31, &cf
.r31
);
117 /* Provide a prototype to silence -Wmissing-prototypes. */
118 void _initialize_ppcobsd_nat (void);
121 _initialize_ppcobsd_nat (void)
123 struct target_ops
*t
;
125 /* Add in local overrides. */
126 t
= inf_ptrace_target ();
127 t
->to_fetch_registers
= ppcobsd_fetch_registers
;
128 t
->to_store_registers
= ppcobsd_store_registers
;
131 /* General-purpose registers. */
132 ppcobsd_reg_offsets
.r0_offset
= offsetof (struct reg
, gpr
);
133 ppcobsd_reg_offsets
.pc_offset
= offsetof (struct reg
, pc
);
134 ppcobsd_reg_offsets
.ps_offset
= offsetof (struct reg
, ps
);
135 ppcobsd_reg_offsets
.cr_offset
= offsetof (struct reg
, cnd
);
136 ppcobsd_reg_offsets
.lr_offset
= offsetof (struct reg
, lr
);
137 ppcobsd_reg_offsets
.ctr_offset
= offsetof (struct reg
, cnt
);
138 ppcobsd_reg_offsets
.xer_offset
= offsetof (struct reg
, xer
);
139 ppcobsd_reg_offsets
.mq_offset
= offsetof (struct reg
, mq
);
141 /* Floating-point registers. */
142 ppcobsd_reg_offsets
.f0_offset
= offsetof (struct reg
, fpr
);
143 ppcobsd_reg_offsets
.fpscr_offset
= -1;
145 /* AltiVec registers. */
146 ppcobsd_reg_offsets
.vr0_offset
= offsetof (struct vreg
, vreg
);
147 ppcobsd_reg_offsets
.vscr_offset
= offsetof (struct vreg
, vscr
);
148 ppcobsd_reg_offsets
.vrsave_offset
= offsetof (struct vreg
, vrsave
);
150 /* Support debugging kernel virtual memory images. */
151 bsd_kvm_add_target (ppcobsd_supply_pcb
);
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