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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" | |
d28b44a7 | 37 | #include "gdb_assert.h" |
485721b1 JT |
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 | ||
063715bf | 58 | for (i = 0; i < ppc_num_gprs; i++) |
485721b1 | 59 | { |
cdf2c5f5 JB |
60 | if (regno == tdep->ppc_gp0_regnum + i || regno == -1) |
61 | supply_register (tdep->ppc_gp0_regnum + i, | |
62 | regs + REG_FIXREG_OFFSET (i)); | |
485721b1 JT |
63 | } |
64 | ||
65 | if (regno == tdep->ppc_lr_regnum || regno == -1) | |
66 | supply_register (tdep->ppc_lr_regnum, regs + REG_LR_OFFSET); | |
67 | ||
68 | if (regno == tdep->ppc_cr_regnum || regno == -1) | |
69 | supply_register (tdep->ppc_cr_regnum, regs + REG_CR_OFFSET); | |
70 | ||
71 | if (regno == tdep->ppc_xer_regnum || regno == -1) | |
72 | supply_register (tdep->ppc_xer_regnum, regs + REG_XER_OFFSET); | |
73 | ||
74 | if (regno == tdep->ppc_ctr_regnum || regno == -1) | |
75 | supply_register (tdep->ppc_ctr_regnum, regs + REG_CTR_OFFSET); | |
76 | ||
77 | if (regno == PC_REGNUM || regno == -1) | |
78 | supply_register (PC_REGNUM, regs + REG_PC_OFFSET); | |
79 | } | |
80 | ||
81 | void | |
82 | ppcnbsd_fill_reg (char *regs, int regno) | |
83 | { | |
84 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
85 | int i; | |
86 | ||
063715bf | 87 | for (i = 0; i < ppc_num_gprs; i++) |
485721b1 | 88 | { |
cdf2c5f5 JB |
89 | if (regno == tdep->ppc_gp0_regnum + i || regno == -1) |
90 | regcache_collect (tdep->ppc_gp0_regnum + i, | |
91 | regs + REG_FIXREG_OFFSET (i)); | |
485721b1 JT |
92 | } |
93 | ||
94 | if (regno == tdep->ppc_lr_regnum || regno == -1) | |
95 | regcache_collect (tdep->ppc_lr_regnum, regs + REG_LR_OFFSET); | |
96 | ||
97 | if (regno == tdep->ppc_cr_regnum || regno == -1) | |
98 | regcache_collect (tdep->ppc_cr_regnum, regs + REG_CR_OFFSET); | |
99 | ||
100 | if (regno == tdep->ppc_xer_regnum || regno == -1) | |
101 | regcache_collect (tdep->ppc_xer_regnum, regs + REG_XER_OFFSET); | |
102 | ||
103 | if (regno == tdep->ppc_ctr_regnum || regno == -1) | |
104 | regcache_collect (tdep->ppc_ctr_regnum, regs + REG_CTR_OFFSET); | |
105 | ||
106 | if (regno == PC_REGNUM || regno == -1) | |
107 | regcache_collect (PC_REGNUM, regs + REG_PC_OFFSET); | |
108 | } | |
109 | ||
110 | void | |
111 | ppcnbsd_supply_fpreg (char *fpregs, int regno) | |
112 | { | |
113 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
114 | int i; | |
115 | ||
383f0f5b JB |
116 | /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating |
117 | point registers. Traditionally, GDB's register set has still | |
118 | listed the floating point registers for such machines, so this | |
119 | code is harmless. However, the new E500 port actually omits the | |
120 | floating point registers entirely from the register set --- they | |
121 | don't even have register numbers assigned to them. | |
122 | ||
123 | It's not clear to me how best to update this code, so this assert | |
124 | will alert the first person to encounter the NetBSD/E500 | |
125 | combination to the problem. */ | |
126 | gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); | |
127 | ||
366f009f | 128 | for (i = 0; i < ppc_num_fprs; i++) |
485721b1 | 129 | { |
366f009f JB |
130 | if (regno == tdep->ppc_fp0_regnum + i || regno == -1) |
131 | supply_register (tdep->ppc_fp0_regnum + i, | |
132 | fpregs + FPREG_FPR_OFFSET (i)); | |
485721b1 JT |
133 | } |
134 | ||
135 | if (regno == tdep->ppc_fpscr_regnum || regno == -1) | |
136 | supply_register (tdep->ppc_fpscr_regnum, fpregs + FPREG_FPSCR_OFFSET); | |
137 | } | |
138 | ||
139 | void | |
140 | ppcnbsd_fill_fpreg (char *fpregs, int regno) | |
141 | { | |
142 | struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch); | |
143 | int i; | |
144 | ||
383f0f5b JB |
145 | /* FIXME: jimb/2004-05-05: Some PPC variants don't have floating |
146 | point registers. Traditionally, GDB's register set has still | |
147 | listed the floating point registers for such machines, so this | |
148 | code is harmless. However, the new E500 port actually omits the | |
149 | floating point registers entirely from the register set --- they | |
150 | don't even have register numbers assigned to them. | |
151 | ||
152 | It's not clear to me how best to update this code, so this assert | |
153 | will alert the first person to encounter the NetBSD/E500 | |
154 | combination to the problem. */ | |
155 | gdb_assert (ppc_floating_point_unit_p (current_gdbarch)); | |
156 | ||
366f009f | 157 | for (i = 0; i < ppc_num_fprs; i++) |
485721b1 | 158 | { |
366f009f JB |
159 | if (regno == tdep->ppc_fp0_regnum + i || regno == -1) |
160 | regcache_collect (tdep->ppc_fp0_regnum + i, | |
161 | fpregs + FPREG_FPR_OFFSET (i)); | |
485721b1 JT |
162 | } |
163 | ||
164 | if (regno == tdep->ppc_fpscr_regnum || regno == -1) | |
165 | regcache_collect (tdep->ppc_fpscr_regnum, fpregs + FPREG_FPSCR_OFFSET); | |
166 | } | |
167 | ||
168 | static void | |
169 | fetch_core_registers (char *core_reg_sect, unsigned core_reg_size, int which, | |
170 | CORE_ADDR ignore) | |
171 | { | |
172 | char *regs, *fpregs; | |
173 | ||
174 | /* We get everything from one section. */ | |
175 | if (which != 0) | |
176 | return; | |
177 | ||
178 | regs = core_reg_sect; | |
179 | fpregs = core_reg_sect + SIZEOF_STRUCT_REG; | |
180 | ||
181 | /* Integer registers. */ | |
182 | ppcnbsd_supply_reg (regs, -1); | |
183 | ||
184 | /* Floating point registers. */ | |
185 | ppcnbsd_supply_fpreg (fpregs, -1); | |
186 | } | |
187 | ||
188 | static void | |
189 | fetch_elfcore_registers (char *core_reg_sect, unsigned core_reg_size, int which, | |
190 | CORE_ADDR ignore) | |
191 | { | |
192 | switch (which) | |
193 | { | |
194 | case 0: /* Integer registers. */ | |
195 | if (core_reg_size != SIZEOF_STRUCT_REG) | |
196 | warning ("Wrong size register set in core file."); | |
197 | else | |
198 | ppcnbsd_supply_reg (core_reg_sect, -1); | |
199 | break; | |
200 | ||
201 | case 2: /* Floating point registers. */ | |
202 | if (core_reg_size != SIZEOF_STRUCT_FPREG) | |
203 | warning ("Wrong size FP register set in core file."); | |
204 | else | |
205 | ppcnbsd_supply_fpreg (core_reg_sect, -1); | |
206 | break; | |
207 | ||
208 | default: | |
209 | /* Don't know what kind of register request this is; just ignore it. */ | |
210 | break; | |
211 | } | |
212 | } | |
213 | ||
214 | static struct core_fns ppcnbsd_core_fns = | |
215 | { | |
216 | bfd_target_unknown_flavour, /* core_flavour */ | |
217 | default_check_format, /* check_format */ | |
218 | default_core_sniffer, /* core_sniffer */ | |
219 | fetch_core_registers, /* core_read_registers */ | |
220 | NULL /* next */ | |
221 | }; | |
222 | ||
223 | static struct core_fns ppcnbsd_elfcore_fns = | |
224 | { | |
225 | bfd_target_elf_flavour, /* core_flavour */ | |
226 | default_check_format, /* check_format */ | |
227 | default_core_sniffer, /* core_sniffer */ | |
228 | fetch_elfcore_registers, /* core_read_registers */ | |
229 | NULL /* next */ | |
230 | }; | |
231 | ||
957e27ac AC |
232 | /* NetBSD is confused. It appears that 1.5 was using the correct SVr4 |
233 | convention but, 1.6 switched to the below broken convention. For | |
234 | the moment use the broken convention. Ulgh!. */ | |
235 | ||
05580c65 AC |
236 | static enum return_value_convention |
237 | ppcnbsd_return_value (struct gdbarch *gdbarch, struct type *valtype, | |
963e2bb7 AC |
238 | struct regcache *regcache, void *readbuf, |
239 | const void *writebuf) | |
05580c65 AC |
240 | { |
241 | if ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT | |
242 | || TYPE_CODE (valtype) == TYPE_CODE_UNION) | |
243 | && !((TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 8) | |
244 | && TYPE_VECTOR (valtype)) | |
245 | && !(TYPE_LENGTH (valtype) == 1 | |
246 | || TYPE_LENGTH (valtype) == 2 | |
247 | || TYPE_LENGTH (valtype) == 4 | |
248 | || TYPE_LENGTH (valtype) == 8)) | |
249 | return RETURN_VALUE_STRUCT_CONVENTION; | |
250 | else | |
251 | return ppc_sysv_abi_broken_return_value (gdbarch, valtype, regcache, | |
963e2bb7 | 252 | readbuf, writebuf); |
957e27ac AC |
253 | } |
254 | ||
476be15e AC |
255 | static void |
256 | ppcnbsd_sigtramp_cache_init (const struct tramp_frame *self, | |
257 | struct frame_info *next_frame, | |
258 | struct trad_frame_cache *this_cache, | |
259 | CORE_ADDR func) | |
260 | { | |
261 | CORE_ADDR base; | |
262 | CORE_ADDR offset; | |
263 | int i; | |
264 | struct gdbarch *gdbarch = get_frame_arch (next_frame); | |
265 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
266 | ||
267 | base = frame_unwind_register_unsigned (next_frame, SP_REGNUM); | |
268 | offset = base + 0x18 + 2 * tdep->wordsize; | |
063715bf | 269 | for (i = 0; i < ppc_num_gprs; i++) |
476be15e AC |
270 | { |
271 | int regnum = i + tdep->ppc_gp0_regnum; | |
272 | trad_frame_set_reg_addr (this_cache, regnum, offset); | |
273 | offset += tdep->wordsize; | |
274 | } | |
275 | trad_frame_set_reg_addr (this_cache, tdep->ppc_lr_regnum, offset); | |
276 | offset += tdep->wordsize; | |
277 | trad_frame_set_reg_addr (this_cache, tdep->ppc_cr_regnum, offset); | |
278 | offset += tdep->wordsize; | |
279 | trad_frame_set_reg_addr (this_cache, tdep->ppc_xer_regnum, offset); | |
280 | offset += tdep->wordsize; | |
281 | trad_frame_set_reg_addr (this_cache, tdep->ppc_ctr_regnum, offset); | |
282 | offset += tdep->wordsize; | |
283 | trad_frame_set_reg_addr (this_cache, PC_REGNUM, offset); /* SRR0? */ | |
284 | offset += tdep->wordsize; | |
285 | ||
286 | /* Construct the frame ID using the function start. */ | |
287 | trad_frame_set_id (this_cache, frame_id_build (base, func)); | |
288 | } | |
289 | ||
290 | /* Given the NEXT frame, examine the instructions at and around this | |
291 | frame's resume address (aka PC) to see of they look like a signal | |
292 | trampoline. Return the address of the trampolines first | |
293 | instruction, or zero if it isn't a signal trampoline. */ | |
294 | ||
295 | static const struct tramp_frame ppcnbsd_sigtramp = { | |
296 | 4, /* insn size */ | |
297 | { /* insn */ | |
298 | 0x38610018, /* addi r3,r1,24 */ | |
299 | 0x38000127, /* li r0,295 */ | |
300 | 0x44000002, /* sc */ | |
301 | 0x38000001, /* li r0,1 */ | |
302 | 0x44000002, /* sc */ | |
303 | TRAMP_SENTINEL_INSN | |
304 | }, | |
305 | ppcnbsd_sigtramp_cache_init | |
306 | }; | |
307 | ||
485721b1 JT |
308 | static void |
309 | ppcnbsd_init_abi (struct gdbarch_info info, | |
310 | struct gdbarch *gdbarch) | |
311 | { | |
e754ae69 AC |
312 | /* For NetBSD, this is an on again, off again thing. Some systems |
313 | do use the broken struct convention, and some don't. */ | |
05580c65 | 314 | set_gdbarch_return_value (gdbarch, ppcnbsd_return_value); |
485721b1 JT |
315 | set_solib_svr4_fetch_link_map_offsets (gdbarch, |
316 | nbsd_ilp32_solib_svr4_fetch_link_map_offsets); | |
476be15e | 317 | tramp_frame_prepend_unwinder (gdbarch, &ppcnbsd_sigtramp); |
485721b1 JT |
318 | } |
319 | ||
320 | void | |
321 | _initialize_ppcnbsd_tdep (void) | |
322 | { | |
05816f70 | 323 | gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_NETBSD_ELF, |
485721b1 JT |
324 | ppcnbsd_init_abi); |
325 | ||
00e32a35 AC |
326 | deprecated_add_core_fns (&ppcnbsd_core_fns); |
327 | deprecated_add_core_fns (&ppcnbsd_elfcore_fns); | |
485721b1 | 328 | } |