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c906108c SS |
1 | /* Functions specific to running gdb native on an ns32k running NetBSD |
2 | Copyright 1989, 1992, 1993, 1994, 1996 Free Software Foundation, Inc. | |
3 | ||
c5aa993b | 4 | This file is part of GDB. |
c906108c | 5 | |
c5aa993b JM |
6 | This program is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
c906108c | 10 | |
c5aa993b JM |
11 | This program is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
c906108c | 15 | |
c5aa993b JM |
16 | You should have received a copy of the GNU General Public License |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
c906108c SS |
20 | |
21 | #include <sys/types.h> | |
22 | #include <sys/ptrace.h> | |
23 | #include <machine/reg.h> | |
24 | #include <machine/frame.h> | |
25 | #include <machine/pcb.h> | |
26 | ||
27 | #include "defs.h" | |
28 | #include "inferior.h" | |
29 | #include "target.h" | |
30 | #include "gdbcore.h" | |
31 | ||
32 | #define RF(dst, src) \ | |
33 | memcpy(®isters[REGISTER_BYTE(dst)], &src, sizeof(src)) | |
34 | ||
35 | #define RS(src, dst) \ | |
36 | memcpy(&dst, ®isters[REGISTER_BYTE(src)], sizeof(dst)) | |
37 | ||
38 | void | |
39 | fetch_inferior_registers (regno) | |
40 | int regno; | |
41 | { | |
42 | struct reg inferior_registers; | |
43 | struct fpreg inferior_fpregisters; | |
44 | ||
45 | ptrace (PT_GETREGS, inferior_pid, | |
c5aa993b | 46 | (PTRACE_ARG3_TYPE) & inferior_registers, 0); |
c906108c | 47 | ptrace (PT_GETFPREGS, inferior_pid, |
c5aa993b JM |
48 | (PTRACE_ARG3_TYPE) & inferior_fpregisters, 0); |
49 | ||
50 | RF (R0_REGNUM + 0, inferior_registers.r_r0); | |
51 | RF (R0_REGNUM + 1, inferior_registers.r_r1); | |
52 | RF (R0_REGNUM + 2, inferior_registers.r_r2); | |
53 | RF (R0_REGNUM + 3, inferior_registers.r_r3); | |
54 | RF (R0_REGNUM + 4, inferior_registers.r_r4); | |
55 | RF (R0_REGNUM + 5, inferior_registers.r_r5); | |
56 | RF (R0_REGNUM + 6, inferior_registers.r_r6); | |
57 | RF (R0_REGNUM + 7, inferior_registers.r_r7); | |
58 | ||
59 | RF (SP_REGNUM, inferior_registers.r_sp); | |
60 | RF (FP_REGNUM, inferior_registers.r_fp); | |
61 | RF (PC_REGNUM, inferior_registers.r_pc); | |
62 | RF (PS_REGNUM, inferior_registers.r_psr); | |
63 | ||
64 | RF (FPS_REGNUM, inferior_fpregisters.r_fsr); | |
65 | RF (FP0_REGNUM + 0, inferior_fpregisters.r_freg[0]); | |
66 | RF (FP0_REGNUM + 2, inferior_fpregisters.r_freg[2]); | |
67 | RF (FP0_REGNUM + 4, inferior_fpregisters.r_freg[4]); | |
68 | RF (FP0_REGNUM + 6, inferior_fpregisters.r_freg[6]); | |
69 | RF (LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]); | |
70 | RF (LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]); | |
71 | RF (LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]); | |
72 | RF (LP0_REGNUM + 7, inferior_fpregisters.r_freg[7]); | |
73 | registers_fetched (); | |
c906108c SS |
74 | } |
75 | ||
76 | void | |
77 | store_inferior_registers (regno) | |
78 | int regno; | |
79 | { | |
80 | struct reg inferior_registers; | |
81 | struct fpreg inferior_fpregisters; | |
82 | ||
c5aa993b JM |
83 | RS (R0_REGNUM + 0, inferior_registers.r_r0); |
84 | RS (R0_REGNUM + 1, inferior_registers.r_r1); | |
85 | RS (R0_REGNUM + 2, inferior_registers.r_r2); | |
86 | RS (R0_REGNUM + 3, inferior_registers.r_r3); | |
87 | RS (R0_REGNUM + 4, inferior_registers.r_r4); | |
88 | RS (R0_REGNUM + 5, inferior_registers.r_r5); | |
89 | RS (R0_REGNUM + 6, inferior_registers.r_r6); | |
90 | RS (R0_REGNUM + 7, inferior_registers.r_r7); | |
91 | ||
92 | RS (SP_REGNUM, inferior_registers.r_sp); | |
93 | RS (FP_REGNUM, inferior_registers.r_fp); | |
94 | RS (PC_REGNUM, inferior_registers.r_pc); | |
95 | RS (PS_REGNUM, inferior_registers.r_psr); | |
96 | ||
97 | RS (FPS_REGNUM, inferior_fpregisters.r_fsr); | |
98 | RS (FP0_REGNUM + 0, inferior_fpregisters.r_freg[0]); | |
99 | RS (FP0_REGNUM + 2, inferior_fpregisters.r_freg[2]); | |
100 | RS (FP0_REGNUM + 4, inferior_fpregisters.r_freg[4]); | |
101 | RS (FP0_REGNUM + 6, inferior_fpregisters.r_freg[6]); | |
102 | RS (LP0_REGNUM + 1, inferior_fpregisters.r_freg[1]); | |
103 | RS (LP0_REGNUM + 3, inferior_fpregisters.r_freg[3]); | |
104 | RS (LP0_REGNUM + 5, inferior_fpregisters.r_freg[5]); | |
105 | RS (LP0_REGNUM + 7, inferior_fpregisters.r_freg[7]); | |
c906108c SS |
106 | |
107 | ptrace (PT_SETREGS, inferior_pid, | |
c5aa993b | 108 | (PTRACE_ARG3_TYPE) & inferior_registers, 0); |
c906108c | 109 | ptrace (PT_SETFPREGS, inferior_pid, |
c5aa993b | 110 | (PTRACE_ARG3_TYPE) & inferior_fpregisters, 0); |
c906108c SS |
111 | } |
112 | \f | |
113 | ||
114 | /* XXX - Add this to machine/regs.h instead? */ | |
c5aa993b JM |
115 | struct coreregs |
116 | { | |
c906108c SS |
117 | struct reg intreg; |
118 | struct fpreg freg; | |
119 | }; | |
120 | ||
121 | /* Get registers from a core file. */ | |
122 | static void | |
123 | fetch_core_registers (core_reg_sect, core_reg_size, which, reg_addr) | |
124 | char *core_reg_sect; | |
125 | unsigned core_reg_size; | |
126 | int which; | |
127 | unsigned int reg_addr; /* Unused in this version */ | |
128 | { | |
129 | struct coreregs *core_reg; | |
130 | ||
c5aa993b | 131 | core_reg = (struct coreregs *) core_reg_sect; |
c906108c SS |
132 | |
133 | /* | |
134 | * We have *all* registers | |
135 | * in the first core section. | |
136 | * Ignore which. | |
137 | */ | |
138 | ||
c5aa993b JM |
139 | if (core_reg_size < sizeof (*core_reg)) |
140 | { | |
141 | fprintf_unfiltered (gdb_stderr, "Couldn't read regs from core file\n"); | |
142 | return; | |
143 | } | |
c906108c SS |
144 | |
145 | /* Integer registers */ | |
c5aa993b JM |
146 | RF (R0_REGNUM + 0, core_reg->intreg.r_r0); |
147 | RF (R0_REGNUM + 1, core_reg->intreg.r_r1); | |
148 | RF (R0_REGNUM + 2, core_reg->intreg.r_r2); | |
149 | RF (R0_REGNUM + 3, core_reg->intreg.r_r3); | |
150 | RF (R0_REGNUM + 4, core_reg->intreg.r_r4); | |
151 | RF (R0_REGNUM + 5, core_reg->intreg.r_r5); | |
152 | RF (R0_REGNUM + 6, core_reg->intreg.r_r6); | |
153 | RF (R0_REGNUM + 7, core_reg->intreg.r_r7); | |
154 | ||
155 | RF (SP_REGNUM, core_reg->intreg.r_sp); | |
156 | RF (FP_REGNUM, core_reg->intreg.r_fp); | |
157 | RF (PC_REGNUM, core_reg->intreg.r_pc); | |
158 | RF (PS_REGNUM, core_reg->intreg.r_psr); | |
c906108c SS |
159 | |
160 | /* Floating point registers */ | |
c5aa993b JM |
161 | RF (FPS_REGNUM, core_reg->freg.r_fsr); |
162 | RF (FP0_REGNUM + 0, core_reg->freg.r_freg[0]); | |
163 | RF (FP0_REGNUM + 2, core_reg->freg.r_freg[2]); | |
164 | RF (FP0_REGNUM + 4, core_reg->freg.r_freg[4]); | |
165 | RF (FP0_REGNUM + 6, core_reg->freg.r_freg[6]); | |
166 | RF (LP0_REGNUM + 1, core_reg->freg.r_freg[1]); | |
167 | RF (LP0_REGNUM + 3, core_reg->freg.r_freg[3]); | |
168 | RF (LP0_REGNUM + 5, core_reg->freg.r_freg[5]); | |
169 | RF (LP0_REGNUM + 7, core_reg->freg.r_freg[7]); | |
c906108c SS |
170 | registers_fetched (); |
171 | } | |
172 | ||
173 | /* Register that we are able to handle ns32knbsd core file formats. | |
174 | FIXME: is this really bfd_target_unknown_flavour? */ | |
175 | ||
176 | static struct core_fns nat_core_fns = | |
177 | { | |
2acceee2 JM |
178 | bfd_target_unknown_flavour, /* core_flavour */ |
179 | default_check_format, /* check_format */ | |
180 | default_core_sniffer, /* core_sniffer */ | |
181 | fetch_core_registers, /* core_read_registers */ | |
182 | NULL /* next */ | |
c906108c SS |
183 | }; |
184 | ||
185 | void | |
186 | _initialize_ns32knbsd_nat () | |
187 | { | |
188 | add_core_fns (&nat_core_fns); | |
189 | } | |
190 | \f | |
191 | ||
192 | /* | |
193 | * kernel_u_size() is not helpful on NetBSD because | |
194 | * the "u" struct is NOT in the core dump file. | |
195 | */ | |
196 | ||
197 | #ifdef FETCH_KCORE_REGISTERS | |
198 | /* | |
199 | * Get registers from a kernel crash dump or live kernel. | |
200 | * Called by kcore-nbsd.c:get_kcore_registers(). | |
201 | */ | |
202 | void | |
203 | fetch_kcore_registers (pcb) | |
204 | struct pcb *pcb; | |
205 | { | |
206 | struct switchframe sf; | |
207 | struct reg intreg; | |
208 | int dummy; | |
209 | ||
210 | /* Integer registers */ | |
c5aa993b JM |
211 | if (target_read_memory ((CORE_ADDR) pcb->pcb_ksp, (char *) &sf, sizeof sf)) |
212 | error ("Cannot read integer registers."); | |
c906108c SS |
213 | |
214 | /* We use the psr at kernel entry */ | |
c5aa993b JM |
215 | if (target_read_memory ((CORE_ADDR) pcb->pcb_onstack, (char *) &intreg, sizeof intreg)) |
216 | error ("Cannot read processor status register."); | |
c906108c SS |
217 | |
218 | dummy = 0; | |
c5aa993b JM |
219 | RF (R0_REGNUM + 0, dummy); |
220 | RF (R0_REGNUM + 1, dummy); | |
221 | RF (R0_REGNUM + 2, dummy); | |
222 | RF (R0_REGNUM + 3, sf.sf_r3); | |
223 | RF (R0_REGNUM + 4, sf.sf_r4); | |
224 | RF (R0_REGNUM + 5, sf.sf_r5); | |
225 | RF (R0_REGNUM + 6, sf.sf_r6); | |
226 | RF (R0_REGNUM + 7, sf.sf_r7); | |
c906108c SS |
227 | |
228 | dummy = pcb->pcb_kfp + 8; | |
c5aa993b JM |
229 | RF (SP_REGNUM, dummy); |
230 | RF (FP_REGNUM, sf.sf_fp); | |
231 | RF (PC_REGNUM, sf.sf_pc); | |
232 | RF (PS_REGNUM, intreg.r_psr); | |
c906108c SS |
233 | |
234 | /* Floating point registers */ | |
c5aa993b JM |
235 | RF (FPS_REGNUM, pcb->pcb_fsr); |
236 | RF (FP0_REGNUM + 0, pcb->pcb_freg[0]); | |
237 | RF (FP0_REGNUM + 2, pcb->pcb_freg[2]); | |
238 | RF (FP0_REGNUM + 4, pcb->pcb_freg[4]); | |
239 | RF (FP0_REGNUM + 6, pcb->pcb_freg[6]); | |
240 | RF (LP0_REGNUM + 1, pcb->pcb_freg[1]); | |
241 | RF (LP0_REGNUM + 3, pcb->pcb_freg[3]); | |
242 | RF (LP0_REGNUM + 5, pcb->pcb_freg[5]); | |
243 | RF (LP0_REGNUM + 7, pcb->pcb_freg[7]); | |
c906108c SS |
244 | registers_fetched (); |
245 | } | |
c5aa993b | 246 | #endif /* FETCH_KCORE_REGISTERS */ |
c906108c SS |
247 | |
248 | void | |
c5aa993b | 249 | clear_regs () |
c906108c SS |
250 | { |
251 | double zero = 0.0; | |
252 | int null = 0; | |
c5aa993b | 253 | |
c906108c | 254 | /* Integer registers */ |
c5aa993b JM |
255 | RF (R0_REGNUM + 0, null); |
256 | RF (R0_REGNUM + 1, null); | |
257 | RF (R0_REGNUM + 2, null); | |
258 | RF (R0_REGNUM + 3, null); | |
259 | RF (R0_REGNUM + 4, null); | |
260 | RF (R0_REGNUM + 5, null); | |
261 | RF (R0_REGNUM + 6, null); | |
262 | RF (R0_REGNUM + 7, null); | |
263 | ||
264 | RF (SP_REGNUM, null); | |
265 | RF (FP_REGNUM, null); | |
266 | RF (PC_REGNUM, null); | |
267 | RF (PS_REGNUM, null); | |
c906108c SS |
268 | |
269 | /* Floating point registers */ | |
c5aa993b JM |
270 | RF (FPS_REGNUM, zero); |
271 | RF (FP0_REGNUM + 0, zero); | |
272 | RF (FP0_REGNUM + 2, zero); | |
273 | RF (FP0_REGNUM + 4, zero); | |
274 | RF (FP0_REGNUM + 6, zero); | |
275 | RF (LP0_REGNUM + 0, zero); | |
276 | RF (LP0_REGNUM + 1, zero); | |
277 | RF (LP0_REGNUM + 2, zero); | |
278 | RF (LP0_REGNUM + 3, zero); | |
c906108c SS |
279 | return; |
280 | } | |
281 | ||
282 | /* Return number of args passed to a frame. | |
283 | Can return -1, meaning no way to tell. */ | |
284 | ||
285 | int | |
c5aa993b JM |
286 | frame_num_args (fi) |
287 | struct frame_info *fi; | |
c906108c | 288 | { |
c5aa993b JM |
289 | CORE_ADDR enter_addr; |
290 | CORE_ADDR argp; | |
291 | int inst; | |
292 | int args; | |
293 | int i; | |
294 | ||
295 | if (read_memory_integer (fi->frame, 4) == 0 && fi->pc < 0x10000) | |
296 | { | |
297 | /* main is always called with three args */ | |
298 | return (3); | |
299 | } | |
300 | enter_addr = ns32k_get_enter_addr (fi->pc); | |
301 | if (enter_addr = 0) | |
302 | return (-1); | |
303 | argp = enter_addr == 1 ? SAVED_PC_AFTER_CALL (fi) : FRAME_SAVED_PC (fi); | |
304 | for (i = 0; i < 16; i++) | |
305 | { | |
306 | /* | |
307 | * After a bsr gcc may emit the following instructions | |
308 | * to remove the arguments from the stack: | |
309 | * cmpqd 0,tos - to remove 4 bytes from the stack | |
310 | * cmpd tos,tos - to remove 8 bytes from the stack | |
311 | * adjsp[bwd] -n - to remove n bytes from the stack | |
312 | * Gcc sometimes delays emitting these instructions and | |
313 | * may even throw a branch between our feet. | |
314 | */ | |
315 | inst = read_memory_integer (argp, 4); | |
316 | args = read_memory_integer (argp + 2, 4); | |
317 | if ((inst & 0xff) == 0xea) | |
318 | { /* br */ | |
319 | args = ((inst >> 8) & 0xffffff) | (args << 24); | |
320 | if (args & 0x80) | |
321 | { | |
322 | if (args & 0x40) | |
323 | { | |
324 | args = ntohl (args); | |
c906108c | 325 | } |
c5aa993b JM |
326 | else |
327 | { | |
328 | args = ntohs (args & 0xffff); | |
329 | if (args & 0x2000) | |
330 | args |= 0xc000; | |
c906108c | 331 | } |
c5aa993b JM |
332 | } |
333 | else | |
334 | { | |
335 | args = args & 0xff; | |
336 | if (args & 0x40) | |
337 | args |= 0x80; | |
338 | } | |
339 | argp += args; | |
340 | continue; | |
341 | } | |
342 | if ((inst & 0xffff) == 0xb81f) /* cmpqd 0,tos */ | |
343 | return (1); | |
344 | else if ((inst & 0xffff) == 0xbdc7) /* cmpd tos,tos */ | |
345 | return (2); | |
346 | else if ((inst & 0xfffc) == 0xa57c) | |
347 | { /* adjsp[bwd] */ | |
348 | switch (inst & 3) | |
349 | { | |
350 | case 0: | |
351 | args = ((args & 0xff) + 0x80); | |
352 | break; | |
353 | case 1: | |
354 | args = ((ntohs (args) & 0xffff) + 0x8000); | |
355 | break; | |
356 | case 3: | |
357 | args = -ntohl (args); | |
358 | break; | |
359 | default: | |
360 | return (-1); | |
361 | } | |
362 | if (args / 4 > 10 || (args & 3) != 0) | |
363 | continue; | |
364 | return (args / 4); | |
c906108c | 365 | } |
c5aa993b JM |
366 | argp += 1; |
367 | } | |
368 | return (-1); | |
c906108c | 369 | } |