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485721b1 | 1 | /* Target-dependent code for PowerPC systems running NetBSD. |
476be15e AC |
2 | |
3 | Copyright 2002, 2003, 2004 Free Software Foundation, Inc. | |
4 | ||
485721b1 JT |
5 | Contributed by Wasabi Systems, Inc. |
6 | ||
7 | This file is part of GDB. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 59 Temple Place - Suite 330, | |
22 | Boston, MA 02111-1307, USA. */ | |
23 | ||
24 | #include "defs.h" | |
25 | #include "gdbcore.h" | |
26 | #include "regcache.h" | |
27 | #include "target.h" | |
28 | #include "breakpoint.h" | |
29 | #include "value.h" | |
4be87837 | 30 | #include "osabi.h" |
485721b1 JT |
31 | |
32 | #include "ppc-tdep.h" | |
33 | #include "ppcnbsd-tdep.h" | |
34 | #include "nbsd-tdep.h" | |
476be15e AC |
35 | #include "tramp-frame.h" |
36 | #include "trad-frame.h" | |
485721b1 JT |
37 | |
38 | #include "solib-svr4.h" | |
39 | ||
40 | #define REG_FIXREG_OFFSET(x) ((x) * 4) | |
41 | #define REG_LR_OFFSET (32 * 4) | |
42 | #define REG_CR_OFFSET (33 * 4) | |
43 | #define REG_XER_OFFSET (34 * 4) | |
44 | #define REG_CTR_OFFSET (35 * 4) | |
45 | #define REG_PC_OFFSET (36 * 4) | |
46 | #define SIZEOF_STRUCT_REG (37 * 4) | |
47 | ||
48 | #define FPREG_FPR_OFFSET(x) ((x) * 8) | |
49 | #define FPREG_FPSCR_OFFSET (32 * 8) | |
50 | #define SIZEOF_STRUCT_FPREG (33 * 8) | |
51 | ||
52 | void | |
53 | ppcnbsd_supply_reg (char *regs, int regno) | |
54 | { | |
55 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
56 | int i; | |
57 | ||
58 | for (i = 0; i <= 31; i++) | |
59 | { | |
60 | if (regno == i || regno == -1) | |
61 | supply_register (i, regs + REG_FIXREG_OFFSET (i)); | |
62 | } | |
63 | ||
64 | if (regno == tdep->ppc_lr_regnum || regno == -1) | |
65 | supply_register (tdep->ppc_lr_regnum, regs + REG_LR_OFFSET); | |
66 | ||
67 | if (regno == tdep->ppc_cr_regnum || regno == -1) | |
68 | supply_register (tdep->ppc_cr_regnum, regs + REG_CR_OFFSET); | |
69 | ||
70 | if (regno == tdep->ppc_xer_regnum || regno == -1) | |
71 | supply_register (tdep->ppc_xer_regnum, regs + REG_XER_OFFSET); | |
72 | ||
73 | if (regno == tdep->ppc_ctr_regnum || regno == -1) | |
74 | supply_register (tdep->ppc_ctr_regnum, regs + REG_CTR_OFFSET); | |
75 | ||
76 | if (regno == PC_REGNUM || regno == -1) | |
77 | supply_register (PC_REGNUM, regs + REG_PC_OFFSET); | |
78 | } | |
79 | ||
80 | void | |
81 | ppcnbsd_fill_reg (char *regs, int regno) | |
82 | { | |
83 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
84 | int i; | |
85 | ||
86 | for (i = 0; i <= 31; i++) | |
87 | { | |
88 | if (regno == i || regno == -1) | |
89 | regcache_collect (i, regs + REG_FIXREG_OFFSET (i)); | |
90 | } | |
91 | ||
92 | if (regno == tdep->ppc_lr_regnum || regno == -1) | |
93 | regcache_collect (tdep->ppc_lr_regnum, regs + REG_LR_OFFSET); | |
94 | ||
95 | if (regno == tdep->ppc_cr_regnum || regno == -1) | |
96 | regcache_collect (tdep->ppc_cr_regnum, regs + REG_CR_OFFSET); | |
97 | ||
98 | if (regno == tdep->ppc_xer_regnum || regno == -1) | |
99 | regcache_collect (tdep->ppc_xer_regnum, regs + REG_XER_OFFSET); | |
100 | ||
101 | if (regno == tdep->ppc_ctr_regnum || regno == -1) | |
102 | regcache_collect (tdep->ppc_ctr_regnum, regs + REG_CTR_OFFSET); | |
103 | ||
104 | if (regno == PC_REGNUM || regno == -1) | |
105 | regcache_collect (PC_REGNUM, regs + REG_PC_OFFSET); | |
106 | } | |
107 | ||
108 | void | |
109 | ppcnbsd_supply_fpreg (char *fpregs, int regno) | |
110 | { | |
111 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
112 | int i; | |
113 | ||
383f0f5b JB |
114 | /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating |
115 | point registers. Traditionally, GDB's register set has still | |
116 | listed the floating point registers for such machines, so this | |
117 | code is harmless. However, the new E500 port actually omits the | |
118 | floating point registers entirely from the register set --- they | |
119 | don't even have register numbers assigned to them. | |
120 | ||
121 | It's not clear to me how best to update this code, so this assert | |
122 | will alert the first person to encounter the NetBSD/E500 | |
123 | combination to the problem. */ | |
124 | gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); | |
125 | ||
366f009f | 126 | for (i = 0; i < ppc_num_fprs; i++) |
485721b1 | 127 | { |
366f009f JB |
128 | if (regno == tdep->ppc_fp0_regnum + i || regno == -1) |
129 | supply_register (tdep->ppc_fp0_regnum + i, | |
130 | fpregs + FPREG_FPR_OFFSET (i)); | |
485721b1 JT |
131 | } |
132 | ||
133 | if (regno == tdep->ppc_fpscr_regnum || regno == -1) | |
134 | supply_register (tdep->ppc_fpscr_regnum, fpregs + FPREG_FPSCR_OFFSET); | |
135 | } | |
136 | ||
137 | void | |
138 | ppcnbsd_fill_fpreg (char *fpregs, int regno) | |
139 | { | |
140 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
141 | int i; | |
142 | ||
383f0f5b JB |
143 | /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating |
144 | point registers. Traditionally, GDB's register set has still | |
145 | listed the floating point registers for such machines, so this | |
146 | code is harmless. However, the new E500 port actually omits the | |
147 | floating point registers entirely from the register set --- they | |
148 | don't even have register numbers assigned to them. | |
149 | ||
150 | It's not clear to me how best to update this code, so this assert | |
151 | will alert the first person to encounter the NetBSD/E500 | |
152 | combination to the problem. */ | |
153 | gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); | |
154 | ||
366f009f | 155 | for (i = 0; i < ppc_num_fprs; i++) |
485721b1 | 156 | { |
366f009f JB |
157 | if (regno == tdep->ppc_fp0_regnum + i || regno == -1) |
158 | regcache_collect (tdep->ppc_fp0_regnum + i, | |
159 | fpregs + FPREG_FPR_OFFSET (i)); | |
485721b1 JT |
160 | } |
161 | ||
162 | if (regno == tdep->ppc_fpscr_regnum || regno == -1) | |
163 | regcache_collect (tdep->ppc_fpscr_regnum, fpregs + FPREG_FPSCR_OFFSET); | |
164 | } | |
165 | ||
166 | static void | |
167 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which, | |
168 | CORE_ADDR ignore) | |
169 | { | |
170 | char *regs, *fpregs; | |
171 | ||
172 | /* We get everything from one section. */ | |
173 | if (which != 0) | |
174 | return; | |
175 | ||
176 | regs = core_reg_sect; | |
177 | fpregs = core_reg_sect + SIZEOF_STRUCT_REG; | |
178 | ||
179 | /* Integer registers. */ | |
180 | ppcnbsd_supply_reg (regs, -1); | |
181 | ||
182 | /* Floating point registers. */ | |
183 | ppcnbsd_supply_fpreg (fpregs, -1); | |
184 | } | |
185 | ||
186 | static void | |
187 | fetch_elfcore_registers (char *core_reg_sect, unsigned core_reg_size, int which, | |
188 | CORE_ADDR ignore) | |
189 | { | |
190 | switch (which) | |
191 | { | |
192 | case 0: /* Integer registers. */ | |
193 | if (core_reg_size != SIZEOF_STRUCT_REG) | |
194 | warning ("Wrong size register set in core file."); | |
195 | else | |
196 | ppcnbsd_supply_reg (core_reg_sect, -1); | |
197 | break; | |
198 | ||
199 | case 2: /* Floating point registers. */ | |
200 | if (core_reg_size != SIZEOF_STRUCT_FPREG) | |
201 | warning ("Wrong size FP register set in core file."); | |
202 | else | |
203 | ppcnbsd_supply_fpreg (core_reg_sect, -1); | |
204 | break; | |
205 | ||
206 | default: | |
207 | /* Don't know what kind of register request this is; just ignore it. */ | |
208 | break; | |
209 | } | |
210 | } | |
211 | ||
212 | static struct core_fns ppcnbsd_core_fns = | |
213 | { | |
214 | bfd_target_unknown_flavour, /* core_flavour */ | |
215 | default_check_format, /* check_format */ | |
216 | default_core_sniffer, /* core_sniffer */ | |
217 | fetch_core_registers, /* core_read_registers */ | |
218 | NULL /* next */ | |
219 | }; | |
220 | ||
221 | static struct core_fns ppcnbsd_elfcore_fns = | |
222 | { | |
223 | bfd_target_elf_flavour, /* core_flavour */ | |
224 | default_check_format, /* check_format */ | |
225 | default_core_sniffer, /* core_sniffer */ | |
226 | fetch_elfcore_registers, /* core_read_registers */ | |
227 | NULL /* next */ | |
228 | }; | |
229 | ||
957e27ac AC |
230 | /* NetBSD is confused. It appears that 1.5 was using the correct SVr4 |
231 | convention but, 1.6 switched to the below broken convention. For | |
232 | the moment use the broken convention. Ulgh!. */ | |
233 | ||
05580c65 AC |
234 | static enum return_value_convention |
235 | ppcnbsd_return_value (struct gdbarch *gdbarch, struct type *valtype, | |
963e2bb7 AC |
236 | struct regcache *regcache, void *readbuf, |
237 | const void *writebuf) | |
05580c65 AC |
238 | { |
239 | if ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT | |
240 | || TYPE_CODE (valtype) == TYPE_CODE_UNION) | |
241 | && !((TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 8) | |
242 | && TYPE_VECTOR (valtype)) | |
243 | && !(TYPE_LENGTH (valtype) == 1 | |
244 | || TYPE_LENGTH (valtype) == 2 | |
245 | || TYPE_LENGTH (valtype) == 4 | |
246 | || TYPE_LENGTH (valtype) == 8)) | |
247 | return RETURN_VALUE_STRUCT_CONVENTION; | |
248 | else | |
249 | return ppc_sysv_abi_broken_return_value (gdbarch, valtype, regcache, | |
963e2bb7 | 250 | readbuf, writebuf); |
957e27ac AC |
251 | } |
252 | ||
476be15e AC |
253 | static void |
254 | ppcnbsd_sigtramp_cache_init (const struct tramp_frame *self, | |
255 | struct frame_info *next_frame, | |
256 | struct trad_frame_cache *this_cache, | |
257 | CORE_ADDR func) | |
258 | { | |
259 | CORE_ADDR base; | |
260 | CORE_ADDR offset; | |
261 | int i; | |
262 | struct gdbarch *gdbarch = get_frame_arch (next_frame); | |
263 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
264 | ||
265 | base = frame_unwind_register_unsigned (next_frame, SP_REGNUM); | |
266 | offset = base + 0x18 + 2 * tdep->wordsize; | |
267 | for (i = 0; i < 32; i++) | |
268 | { | |
269 | int regnum = i + tdep->ppc_gp0_regnum; | |
270 | trad_frame_set_reg_addr (this_cache, regnum, offset); | |
271 | offset += tdep->wordsize; | |
272 | } | |
273 | trad_frame_set_reg_addr (this_cache, tdep->ppc_lr_regnum, offset); | |
274 | offset += tdep->wordsize; | |
275 | trad_frame_set_reg_addr (this_cache, tdep->ppc_cr_regnum, offset); | |
276 | offset += tdep->wordsize; | |
277 | trad_frame_set_reg_addr (this_cache, tdep->ppc_xer_regnum, offset); | |
278 | offset += tdep->wordsize; | |
279 | trad_frame_set_reg_addr (this_cache, tdep->ppc_ctr_regnum, offset); | |
280 | offset += tdep->wordsize; | |
281 | trad_frame_set_reg_addr (this_cache, PC_REGNUM, offset); /* SRR0? */ | |
282 | offset += tdep->wordsize; | |
283 | ||
284 | /* Construct the frame ID using the function start. */ | |
285 | trad_frame_set_id (this_cache, frame_id_build (base, func)); | |
286 | } | |
287 | ||
288 | /* Given the NEXT frame, examine the instructions at and around this | |
289 | frame's resume address (aka PC) to see of they look like a signal | |
290 | trampoline. Return the address of the trampolines first | |
291 | instruction, or zero if it isn't a signal trampoline. */ | |
292 | ||
293 | static const struct tramp_frame ppcnbsd_sigtramp = { | |
294 | 4, /* insn size */ | |
295 | { /* insn */ | |
296 | 0x38610018, /* addi r3,r1,24 */ | |
297 | 0x38000127, /* li r0,295 */ | |
298 | 0x44000002, /* sc */ | |
299 | 0x38000001, /* li r0,1 */ | |
300 | 0x44000002, /* sc */ | |
301 | TRAMP_SENTINEL_INSN | |
302 | }, | |
303 | ppcnbsd_sigtramp_cache_init | |
304 | }; | |
305 | ||
485721b1 JT |
306 | static void |
307 | ppcnbsd_init_abi (struct gdbarch_info info, | |
308 | struct gdbarch *gdbarch) | |
309 | { | |
e754ae69 AC |
310 | /* For NetBSD, this is an on again, off again thing. Some systems |
311 | do use the broken struct convention, and some don't. */ | |
05580c65 | 312 | set_gdbarch_return_value (gdbarch, ppcnbsd_return_value); |
485721b1 JT |
313 | set_solib_svr4_fetch_link_map_offsets (gdbarch, |
314 | nbsd_ilp32_solib_svr4_fetch_link_map_offsets); | |
476be15e | 315 | tramp_frame_prepend_unwinder (gdbarch, &ppcnbsd_sigtramp); |
485721b1 JT |
316 | } |
317 | ||
318 | void | |
319 | _initialize_ppcnbsd_tdep (void) | |
320 | { | |
05816f70 | 321 | gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_NETBSD_ELF, |
485721b1 JT |
322 | ppcnbsd_init_abi); |
323 | ||
00e32a35 AC |
324 | deprecated_add_core_fns (&ppcnbsd_core_fns); |
325 | deprecated_add_core_fns (&ppcnbsd_elfcore_fns); | |
485721b1 | 326 | } |