1 /* Target-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. */
23 #include "arch-utils.h"
24 #include "floatformat.h"
28 #include "trad-frame.h"
29 #include "tramp-frame.h"
31 #include "gdb_assert.h"
32 #include "gdb_string.h"
35 #include "ppcobsd-tdep.h"
36 #include "solib-svr4.h"
38 /* Register offsets from <machine/reg.h>. */
39 struct ppc_reg_offsets ppcobsd_reg_offsets
;
42 /* Core file support. */
44 /* Supply register REGNUM in the general-purpose register set REGSET
45 from the buffer specified by GREGS and LEN to register cache
46 REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */
49 ppcobsd_supply_gregset (const struct regset
*regset
,
50 struct regcache
*regcache
, int regnum
,
51 const void *gregs
, size_t len
)
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 OpenBSD/E500
62 combination to the problem. */
63 gdb_assert (ppc_floating_point_unit_p (current_gdbarch
));
65 ppc_supply_gregset (regset
, regcache
, regnum
, gregs
, len
);
66 ppc_supply_fpregset (regset
, regcache
, regnum
, gregs
, len
);
69 /* Collect register REGNUM in the general-purpose register set
70 REGSET. from register cache REGCACHE into the buffer specified by
71 GREGS and LEN. If REGNUM is -1, do this for all registers in
75 ppcobsd_collect_gregset (const struct regset
*regset
,
76 const struct regcache
*regcache
, int regnum
,
77 void *gregs
, size_t len
)
79 /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating
80 point registers. Traditionally, GDB's register set has still
81 listed the floating point registers for such machines, so this
82 code is harmless. However, the new E500 port actually omits the
83 floating point registers entirely from the register set --- they
84 don't even have register numbers assigned to them.
86 It's not clear to me how best to update this code, so this assert
87 will alert the first person to encounter the OpenBSD/E500
88 combination to the problem. */
89 gdb_assert (ppc_floating_point_unit_p (current_gdbarch
));
91 ppc_collect_gregset (regset
, regcache
, regnum
, gregs
, len
);
92 ppc_collect_fpregset (regset
, regcache
, regnum
, gregs
, len
);
95 /* OpenBSD/powerpc register set. */
97 struct regset ppcobsd_gregset
=
100 ppcobsd_supply_gregset
103 /* Return the appropriate register set for the core section identified
104 by SECT_NAME and SECT_SIZE. */
106 static const struct regset
*
107 ppcobsd_regset_from_core_section (struct gdbarch
*gdbarch
,
108 const char *sect_name
, size_t sect_size
)
110 if (strcmp (sect_name
, ".reg") == 0 && sect_size
>= 412)
111 return &ppcobsd_gregset
;
117 /* Signal trampolines. */
120 ppcobsd_sigtramp_cache_init (const struct tramp_frame
*self
,
121 struct frame_info
*next_frame
,
122 struct trad_frame_cache
*this_cache
,
125 struct gdbarch
*gdbarch
= get_frame_arch (next_frame
);
126 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
127 CORE_ADDR addr
, base
;
130 base
= frame_unwind_register_unsigned (next_frame
, SP_REGNUM
);
131 addr
= base
+ 0x18 + 2 * tdep
->wordsize
;
132 for (i
= 0; i
< ppc_num_gprs
; i
++, addr
+= tdep
->wordsize
)
134 int regnum
= i
+ tdep
->ppc_gp0_regnum
;
135 trad_frame_set_reg_addr (this_cache
, regnum
, addr
);
137 trad_frame_set_reg_addr (this_cache
, tdep
->ppc_lr_regnum
, addr
);
138 addr
+= tdep
->wordsize
;
139 trad_frame_set_reg_addr (this_cache
, tdep
->ppc_cr_regnum
, addr
);
140 addr
+= tdep
->wordsize
;
141 trad_frame_set_reg_addr (this_cache
, tdep
->ppc_xer_regnum
, addr
);
142 addr
+= tdep
->wordsize
;
143 trad_frame_set_reg_addr (this_cache
, tdep
->ppc_ctr_regnum
, addr
);
144 addr
+= tdep
->wordsize
;
145 trad_frame_set_reg_addr (this_cache
, PC_REGNUM
, addr
); /* SRR0? */
146 addr
+= tdep
->wordsize
;
148 /* Construct the frame ID using the function start. */
149 trad_frame_set_id (this_cache
, frame_id_build (base
, func
));
152 static const struct tramp_frame ppcobsd_sigtramp
=
157 { 0x3821fff0, -1 }, /* add r1,r1,-16 */
158 { 0x4e800021, -1 }, /* blrl */
159 { 0x38610018, -1 }, /* addi r3,r1,24 */
160 { 0x38000067, -1 }, /* li r0,103 */
161 { 0x44000002, -1 }, /* sc */
162 { 0x38000001, -1 }, /* li r0,1 */
163 { 0x44000002, -1 }, /* sc */
164 { TRAMP_SENTINEL_INSN
, -1 }
166 ppcobsd_sigtramp_cache_init
171 ppcobsd_init_abi (struct gdbarch_info info
, struct gdbarch
*gdbarch
)
173 /* OpenBSD doesn't support the 128-bit `long double' from the psABI. */
174 set_gdbarch_long_double_bit (gdbarch
, 64);
175 set_gdbarch_long_double_format (gdbarch
, &floatformat_ieee_double_big
);
177 /* OpenBSD currently uses a broken GCC. */
178 set_gdbarch_return_value (gdbarch
, ppc_sysv_abi_broken_return_value
);
180 /* OpenBSD uses SVR4-style shared libraries. */
181 set_solib_svr4_fetch_link_map_offsets
182 (gdbarch
, svr4_ilp32_fetch_link_map_offsets
);
184 set_gdbarch_regset_from_core_section
185 (gdbarch
, ppcobsd_regset_from_core_section
);
187 tramp_frame_prepend_unwinder (gdbarch
, &ppcobsd_sigtramp
);
191 /* OpenBSD uses uses the traditional NetBSD core file format, even for
192 ports that use ELF. */
193 #define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF
195 static enum gdb_osabi
196 ppcobsd_core_osabi_sniffer (bfd
*abfd
)
198 if (strcmp (bfd_get_target (abfd
), "netbsd-core") == 0)
199 return GDB_OSABI_NETBSD_CORE
;
201 return GDB_OSABI_UNKNOWN
;
205 /* Provide a prototype to silence -Wmissing-prototypes. */
206 void _initialize_ppcobsd_tdep (void);
209 _initialize_ppcobsd_tdep (void)
211 /* BFD doesn't set a flavour for NetBSD style a.out core files. */
212 gdbarch_register_osabi_sniffer (bfd_arch_powerpc
, bfd_target_unknown_flavour
,
213 ppcobsd_core_osabi_sniffer
);
215 gdbarch_register_osabi (bfd_arch_rs6000
, 0, GDB_OSABI_OPENBSD_ELF
,
217 gdbarch_register_osabi (bfd_arch_powerpc
, 0, GDB_OSABI_OPENBSD_ELF
,
220 /* Avoid initializing the register offsets again if they were
221 already initailized by ppcobsd-nat.c. */
222 if (ppcobsd_reg_offsets
.pc_offset
== 0)
224 /* General-purpose registers. */
225 ppcobsd_reg_offsets
.r0_offset
= 0;
226 ppcobsd_reg_offsets
.pc_offset
= 384;
227 ppcobsd_reg_offsets
.ps_offset
= 388;
228 ppcobsd_reg_offsets
.cr_offset
= 392;
229 ppcobsd_reg_offsets
.lr_offset
= 396;
230 ppcobsd_reg_offsets
.ctr_offset
= 400;
231 ppcobsd_reg_offsets
.xer_offset
= 404;
232 ppcobsd_reg_offsets
.mq_offset
= 408;
234 /* Floating-point registers. */
235 ppcobsd_reg_offsets
.f0_offset
= 128;
236 ppcobsd_reg_offsets
.fpscr_offset
= -1;
238 /* AltiVec registers. */
239 ppcobsd_reg_offsets
.vr0_offset
= 0;
240 ppcobsd_reg_offsets
.vscr_offset
= 512;
241 ppcobsd_reg_offsets
.vrsave_offset
= 520;