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d195bc9f MK |
1 | /* Target-dependent code for OpenBSD/powerpc. |
2 | ||
18b2ae85 | 3 | Copyright 2004, 2005 Free Software Foundation, Inc. |
d195bc9f MK |
4 | |
5 | This file is part of GDB. | |
6 | ||
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. | |
11 | ||
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. | |
16 | ||
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. */ | |
21 | ||
22 | #include "defs.h" | |
23 | #include "arch-utils.h" | |
24 | #include "osabi.h" | |
25 | #include "regcache.h" | |
26 | #include "regset.h" | |
18b2ae85 MK |
27 | #include "trad-frame.h" |
28 | #include "tramp-frame.h" | |
d195bc9f | 29 | |
18b2ae85 | 30 | #include "gdb_assert.h" |
d195bc9f MK |
31 | #include "gdb_string.h" |
32 | ||
33 | #include "ppc-tdep.h" | |
34 | #include "ppcobsd-tdep.h" | |
35 | #include "solib-svr4.h" | |
36 | ||
37 | /* Register offsets from <machine/reg.h>. */ | |
38 | struct ppc_reg_offsets ppcobsd_reg_offsets; | |
39 | \f | |
40 | ||
41 | /* Core file support. */ | |
42 | ||
43 | /* Supply register REGNUM in the general-purpose register set REGSET | |
44 | from the buffer specified by GREGS and LEN to register cache | |
45 | REGCACHE. If REGNUM is -1, do this for all registers in REGSET. */ | |
46 | ||
47 | void | |
48 | ppcobsd_supply_gregset (const struct regset *regset, | |
49 | struct regcache *regcache, int regnum, | |
50 | const void *gregs, size_t len) | |
51 | { | |
383f0f5b JB |
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. | |
58 | ||
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 OpenBSD/E500 | |
61 | combination to the problem. */ | |
62 | gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); | |
63 | ||
d195bc9f MK |
64 | ppc_supply_gregset (regset, regcache, regnum, gregs, len); |
65 | ppc_supply_fpregset (regset, regcache, regnum, gregs, len); | |
66 | } | |
67 | ||
68 | /* Collect register REGNUM in the general-purpose register set | |
69 | REGSET. from register cache REGCACHE into the buffer specified by | |
70 | GREGS and LEN. If REGNUM is -1, do this for all registers in | |
71 | REGSET. */ | |
72 | ||
73 | void | |
74 | ppcobsd_collect_gregset (const struct regset *regset, | |
75 | const struct regcache *regcache, int regnum, | |
76 | void *gregs, size_t len) | |
77 | { | |
383f0f5b JB |
78 | /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating |
79 | point registers. Traditionally, GDB's register set has still | |
80 | listed the floating point registers for such machines, so this | |
81 | code is harmless. However, the new E500 port actually omits the | |
82 | floating point registers entirely from the register set --- they | |
83 | don't even have register numbers assigned to them. | |
84 | ||
85 | It's not clear to me how best to update this code, so this assert | |
86 | will alert the first person to encounter the OpenBSD/E500 | |
87 | combination to the problem. */ | |
88 | gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); | |
89 | ||
d195bc9f MK |
90 | ppc_collect_gregset (regset, regcache, regnum, gregs, len); |
91 | ppc_collect_fpregset (regset, regcache, regnum, gregs, len); | |
92 | } | |
93 | ||
94 | /* OpenBS/powerpc register set. */ | |
95 | ||
96 | struct regset ppcobsd_gregset = | |
97 | { | |
98 | &ppcobsd_reg_offsets, | |
99 | ppcobsd_supply_gregset | |
100 | }; | |
101 | ||
102 | /* Return the appropriate register set for the core section identified | |
103 | by SECT_NAME and SECT_SIZE. */ | |
104 | ||
105 | static const struct regset * | |
106 | ppcobsd_regset_from_core_section (struct gdbarch *gdbarch, | |
107 | const char *sect_name, size_t sect_size) | |
108 | { | |
109 | if (strcmp (sect_name, ".reg") == 0 && sect_size >= 412) | |
110 | return &ppcobsd_gregset; | |
111 | ||
112 | return NULL; | |
113 | } | |
114 | \f | |
115 | ||
18b2ae85 MK |
116 | /* Signal trampolines. */ |
117 | ||
118 | static void | |
119 | ppcobsd_sigtramp_cache_init (const struct tramp_frame *self, | |
120 | struct frame_info *next_frame, | |
121 | struct trad_frame_cache *this_cache, | |
122 | CORE_ADDR func) | |
123 | { | |
124 | struct gdbarch *gdbarch = get_frame_arch (next_frame); | |
125 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
126 | CORE_ADDR addr, base; | |
127 | int i; | |
128 | ||
129 | base = frame_unwind_register_unsigned (next_frame, SP_REGNUM); | |
130 | addr = base + 0x18 + 2 * tdep->wordsize; | |
131 | for (i = 0; i < ppc_num_gprs; i++, addr += tdep->wordsize) | |
132 | { | |
133 | int regnum = i + tdep->ppc_gp0_regnum; | |
134 | trad_frame_set_reg_addr (this_cache, regnum, addr); | |
135 | } | |
136 | trad_frame_set_reg_addr (this_cache, tdep->ppc_lr_regnum, addr); | |
137 | addr += tdep->wordsize; | |
138 | trad_frame_set_reg_addr (this_cache, tdep->ppc_cr_regnum, addr); | |
139 | addr += tdep->wordsize; | |
140 | trad_frame_set_reg_addr (this_cache, tdep->ppc_xer_regnum, addr); | |
141 | addr += tdep->wordsize; | |
142 | trad_frame_set_reg_addr (this_cache, tdep->ppc_ctr_regnum, addr); | |
143 | addr += tdep->wordsize; | |
144 | trad_frame_set_reg_addr (this_cache, PC_REGNUM, addr); /* SRR0? */ | |
145 | addr += tdep->wordsize; | |
146 | ||
147 | /* Construct the frame ID using the function start. */ | |
148 | trad_frame_set_id (this_cache, frame_id_build (base, func)); | |
149 | } | |
150 | ||
151 | static const struct tramp_frame ppcobsd_sigtramp = | |
152 | { | |
153 | SIGTRAMP_FRAME, | |
154 | 4, | |
155 | { | |
156 | { 0x3821fff0, -1 }, /* add r1,r1,-16 */ | |
157 | { 0x4e800021, -1 }, /* blrl */ | |
158 | { 0x38610018, -1 }, /* addi r3,r1,24 */ | |
159 | { 0x38000067, -1 }, /* li r0,103 */ | |
160 | { 0x44000002, -1 }, /* sc */ | |
161 | { 0x38000001, -1 }, /* li r0,1 */ | |
162 | { 0x44000002, -1 }, /* sc */ | |
163 | { TRAMP_SENTINEL_INSN, -1 } | |
164 | }, | |
165 | ppcobsd_sigtramp_cache_init | |
166 | }; | |
167 | ||
168 | \f | |
d195bc9f MK |
169 | static void |
170 | ppcobsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
171 | { | |
172 | /* OpenBSD uses SVR4-style shared libraries. */ | |
d195bc9f MK |
173 | set_solib_svr4_fetch_link_map_offsets |
174 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); | |
175 | ||
176 | set_gdbarch_regset_from_core_section | |
177 | (gdbarch, ppcobsd_regset_from_core_section); | |
18b2ae85 MK |
178 | |
179 | tramp_frame_prepend_unwinder (gdbarch, &ppcobsd_sigtramp); | |
d195bc9f MK |
180 | } |
181 | \f | |
182 | ||
183 | /* OpenBSD uses uses the traditional NetBSD core file format, even for | |
184 | ports that use ELF. */ | |
185 | #define GDB_OSABI_NETBSD_CORE GDB_OSABI_OPENBSD_ELF | |
186 | ||
187 | static enum gdb_osabi | |
188 | ppcobsd_core_osabi_sniffer (bfd *abfd) | |
189 | { | |
190 | if (strcmp (bfd_get_target (abfd), "netbsd-core") == 0) | |
191 | return GDB_OSABI_NETBSD_CORE; | |
192 | ||
193 | return GDB_OSABI_UNKNOWN; | |
194 | } | |
195 | \f | |
196 | ||
197 | /* Provide a prototype to silence -Wmissing-prototypes. */ | |
198 | void _initialize_ppcobsd_tdep (void); | |
199 | ||
200 | void | |
201 | _initialize_ppcobsd_tdep (void) | |
202 | { | |
203 | /* BFD doesn't set a flavour for NetBSD style a.out core files. */ | |
204 | gdbarch_register_osabi_sniffer (bfd_arch_powerpc, bfd_target_unknown_flavour, | |
205 | ppcobsd_core_osabi_sniffer); | |
206 | ||
207 | gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_OPENBSD_ELF, | |
208 | ppcobsd_init_abi); | |
209 | ||
210 | /* Avoid initializing the register offsets again if they were | |
211 | already initailized by ppcobsd-nat.c. */ | |
212 | if (ppcobsd_reg_offsets.pc_offset == 0) | |
213 | { | |
214 | /* General-purpose registers. */ | |
215 | ppcobsd_reg_offsets.r0_offset = 0; | |
216 | ppcobsd_reg_offsets.pc_offset = 384; | |
217 | ppcobsd_reg_offsets.ps_offset = 388; | |
218 | ppcobsd_reg_offsets.cr_offset = 392; | |
219 | ppcobsd_reg_offsets.lr_offset = 396; | |
220 | ppcobsd_reg_offsets.ctr_offset = 400; | |
221 | ppcobsd_reg_offsets.xer_offset = 404; | |
222 | ppcobsd_reg_offsets.mq_offset = 408; | |
223 | ||
224 | /* Floating-point registers. */ | |
225 | ppcobsd_reg_offsets.f0_offset = 128; | |
226 | ppcobsd_reg_offsets.fpscr_offset = -1; | |
227 | ||
228 | /* AltiVec registers. */ | |
229 | ppcobsd_reg_offsets.vr0_offset = 0; | |
230 | ppcobsd_reg_offsets.vscr_offset = 512; | |
231 | ppcobsd_reg_offsets.vrsave_offset = 520; | |
232 | } | |
233 | } |