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c877c8e6 | 1 | /* Target-dependent code for GDB, the GNU debugger. |
4e052eda | 2 | |
6aba47ca | 3 | Copyright (C) 1986, 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997, |
0fb0cc75 | 4 | 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 |
76a9d10f | 5 | Free Software Foundation, Inc. |
c877c8e6 KB |
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 | |
a9762ec7 | 11 | the Free Software Foundation; either version 3 of the License, or |
c877c8e6 KB |
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 | |
a9762ec7 | 20 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c877c8e6 KB |
21 | |
22 | #include "defs.h" | |
23 | #include "frame.h" | |
24 | #include "inferior.h" | |
25 | #include "symtab.h" | |
26 | #include "target.h" | |
27 | #include "gdbcore.h" | |
28 | #include "gdbcmd.h" | |
29 | #include "symfile.h" | |
30 | #include "objfiles.h" | |
4e052eda | 31 | #include "regcache.h" |
fd0407d6 | 32 | #include "value.h" |
4be87837 | 33 | #include "osabi.h" |
f9be684a | 34 | #include "regset.h" |
6ded7999 | 35 | #include "solib-svr4.h" |
85e747d2 | 36 | #include "solib-spu.h" |
cc5f0d61 UW |
37 | #include "solib.h" |
38 | #include "solist.h" | |
9aa1e687 | 39 | #include "ppc-tdep.h" |
7284e1be | 40 | #include "ppc-linux-tdep.h" |
61a65099 KB |
41 | #include "trad-frame.h" |
42 | #include "frame-unwind.h" | |
a8f60bfc | 43 | #include "tramp-frame.h" |
85e747d2 UW |
44 | #include "observer.h" |
45 | #include "auxv.h" | |
46 | #include "elf/common.h" | |
cc5f0d61 UW |
47 | #include "exceptions.h" |
48 | #include "arch-utils.h" | |
49 | #include "spu-tdep.h" | |
a96d9b2e | 50 | #include "xml-syscall.h" |
9aa1e687 | 51 | |
7284e1be UW |
52 | #include "features/rs6000/powerpc-32l.c" |
53 | #include "features/rs6000/powerpc-altivec32l.c" | |
f4d9bade | 54 | #include "features/rs6000/powerpc-cell32l.c" |
604c2f83 | 55 | #include "features/rs6000/powerpc-vsx32l.c" |
69abc51c TJB |
56 | #include "features/rs6000/powerpc-isa205-32l.c" |
57 | #include "features/rs6000/powerpc-isa205-altivec32l.c" | |
58 | #include "features/rs6000/powerpc-isa205-vsx32l.c" | |
7284e1be UW |
59 | #include "features/rs6000/powerpc-64l.c" |
60 | #include "features/rs6000/powerpc-altivec64l.c" | |
f4d9bade | 61 | #include "features/rs6000/powerpc-cell64l.c" |
604c2f83 | 62 | #include "features/rs6000/powerpc-vsx64l.c" |
69abc51c TJB |
63 | #include "features/rs6000/powerpc-isa205-64l.c" |
64 | #include "features/rs6000/powerpc-isa205-altivec64l.c" | |
65 | #include "features/rs6000/powerpc-isa205-vsx64l.c" | |
7284e1be UW |
66 | #include "features/rs6000/powerpc-e500l.c" |
67 | ||
a96d9b2e SDJ |
68 | /* The syscall's XML filename for PPC and PPC64. */ |
69 | #define XML_SYSCALL_FILENAME_PPC "syscalls/ppc-linux.xml" | |
70 | #define XML_SYSCALL_FILENAME_PPC64 "syscalls/ppc64-linux.xml" | |
c877c8e6 | 71 | |
122a33de KB |
72 | /* ppc_linux_memory_remove_breakpoints attempts to remove a breakpoint |
73 | in much the same fashion as memory_remove_breakpoint in mem-break.c, | |
74 | but is careful not to write back the previous contents if the code | |
75 | in question has changed in between inserting the breakpoint and | |
76 | removing it. | |
77 | ||
78 | Here is the problem that we're trying to solve... | |
79 | ||
80 | Once upon a time, before introducing this function to remove | |
81 | breakpoints from the inferior, setting a breakpoint on a shared | |
82 | library function prior to running the program would not work | |
83 | properly. In order to understand the problem, it is first | |
84 | necessary to understand a little bit about dynamic linking on | |
85 | this platform. | |
86 | ||
87 | A call to a shared library function is accomplished via a bl | |
88 | (branch-and-link) instruction whose branch target is an entry | |
89 | in the procedure linkage table (PLT). The PLT in the object | |
90 | file is uninitialized. To gdb, prior to running the program, the | |
91 | entries in the PLT are all zeros. | |
92 | ||
93 | Once the program starts running, the shared libraries are loaded | |
94 | and the procedure linkage table is initialized, but the entries in | |
95 | the table are not (necessarily) resolved. Once a function is | |
96 | actually called, the code in the PLT is hit and the function is | |
97 | resolved. In order to better illustrate this, an example is in | |
98 | order; the following example is from the gdb testsuite. | |
99 | ||
100 | We start the program shmain. | |
101 | ||
102 | [kev@arroyo testsuite]$ ../gdb gdb.base/shmain | |
103 | [...] | |
104 | ||
105 | We place two breakpoints, one on shr1 and the other on main. | |
106 | ||
107 | (gdb) b shr1 | |
108 | Breakpoint 1 at 0x100409d4 | |
109 | (gdb) b main | |
110 | Breakpoint 2 at 0x100006a0: file gdb.base/shmain.c, line 44. | |
111 | ||
112 | Examine the instruction (and the immediatly following instruction) | |
113 | upon which the breakpoint was placed. Note that the PLT entry | |
114 | for shr1 contains zeros. | |
115 | ||
116 | (gdb) x/2i 0x100409d4 | |
117 | 0x100409d4 <shr1>: .long 0x0 | |
118 | 0x100409d8 <shr1+4>: .long 0x0 | |
119 | ||
120 | Now run 'til main. | |
121 | ||
122 | (gdb) r | |
123 | Starting program: gdb.base/shmain | |
124 | Breakpoint 1 at 0xffaf790: file gdb.base/shr1.c, line 19. | |
125 | ||
126 | Breakpoint 2, main () | |
127 | at gdb.base/shmain.c:44 | |
128 | 44 g = 1; | |
129 | ||
130 | Examine the PLT again. Note that the loading of the shared | |
131 | library has initialized the PLT to code which loads a constant | |
132 | (which I think is an index into the GOT) into r11 and then | |
133 | branchs a short distance to the code which actually does the | |
134 | resolving. | |
135 | ||
136 | (gdb) x/2i 0x100409d4 | |
137 | 0x100409d4 <shr1>: li r11,4 | |
138 | 0x100409d8 <shr1+4>: b 0x10040984 <sg+4> | |
139 | (gdb) c | |
140 | Continuing. | |
141 | ||
142 | Breakpoint 1, shr1 (x=1) | |
143 | at gdb.base/shr1.c:19 | |
144 | 19 l = 1; | |
145 | ||
146 | Now we've hit the breakpoint at shr1. (The breakpoint was | |
147 | reset from the PLT entry to the actual shr1 function after the | |
148 | shared library was loaded.) Note that the PLT entry has been | |
149 | resolved to contain a branch that takes us directly to shr1. | |
150 | (The real one, not the PLT entry.) | |
151 | ||
152 | (gdb) x/2i 0x100409d4 | |
153 | 0x100409d4 <shr1>: b 0xffaf76c <shr1> | |
154 | 0x100409d8 <shr1+4>: b 0x10040984 <sg+4> | |
155 | ||
156 | The thing to note here is that the PLT entry for shr1 has been | |
157 | changed twice. | |
158 | ||
159 | Now the problem should be obvious. GDB places a breakpoint (a | |
160 | trap instruction) on the zero value of the PLT entry for shr1. | |
161 | Later on, after the shared library had been loaded and the PLT | |
162 | initialized, GDB gets a signal indicating this fact and attempts | |
163 | (as it always does when it stops) to remove all the breakpoints. | |
164 | ||
165 | The breakpoint removal was causing the former contents (a zero | |
166 | word) to be written back to the now initialized PLT entry thus | |
167 | destroying a portion of the initialization that had occurred only a | |
168 | short time ago. When execution continued, the zero word would be | |
169 | executed as an instruction an an illegal instruction trap was | |
170 | generated instead. (0 is not a legal instruction.) | |
171 | ||
172 | The fix for this problem was fairly straightforward. The function | |
173 | memory_remove_breakpoint from mem-break.c was copied to this file, | |
174 | modified slightly, and renamed to ppc_linux_memory_remove_breakpoint. | |
175 | In tm-linux.h, MEMORY_REMOVE_BREAKPOINT is defined to call this new | |
176 | function. | |
177 | ||
178 | The differences between ppc_linux_memory_remove_breakpoint () and | |
179 | memory_remove_breakpoint () are minor. All that the former does | |
180 | that the latter does not is check to make sure that the breakpoint | |
181 | location actually contains a breakpoint (trap instruction) prior | |
182 | to attempting to write back the old contents. If it does contain | |
183 | a trap instruction, we allow the old contents to be written back. | |
184 | Otherwise, we silently do nothing. | |
185 | ||
186 | The big question is whether memory_remove_breakpoint () should be | |
187 | changed to have the same functionality. The downside is that more | |
188 | traffic is generated for remote targets since we'll have an extra | |
189 | fetch of a memory word each time a breakpoint is removed. | |
190 | ||
191 | For the time being, we'll leave this self-modifying-code-friendly | |
192 | version in ppc-linux-tdep.c, but it ought to be migrated somewhere | |
193 | else in the event that some other platform has similar needs with | |
194 | regard to removing breakpoints in some potentially self modifying | |
195 | code. */ | |
63807e1d | 196 | static int |
ae4b2284 MD |
197 | ppc_linux_memory_remove_breakpoint (struct gdbarch *gdbarch, |
198 | struct bp_target_info *bp_tgt) | |
482ca3f5 | 199 | { |
8181d85f | 200 | CORE_ADDR addr = bp_tgt->placed_address; |
f4f9705a | 201 | const unsigned char *bp; |
482ca3f5 KB |
202 | int val; |
203 | int bplen; | |
50fd1280 | 204 | gdb_byte old_contents[BREAKPOINT_MAX]; |
8defab1a | 205 | struct cleanup *cleanup; |
482ca3f5 KB |
206 | |
207 | /* Determine appropriate breakpoint contents and size for this address. */ | |
ae4b2284 | 208 | bp = gdbarch_breakpoint_from_pc (gdbarch, &addr, &bplen); |
482ca3f5 | 209 | if (bp == NULL) |
8a3fe4f8 | 210 | error (_("Software breakpoints not implemented for this target.")); |
482ca3f5 | 211 | |
8defab1a DJ |
212 | /* Make sure we see the memory breakpoints. */ |
213 | cleanup = make_show_memory_breakpoints_cleanup (1); | |
482ca3f5 KB |
214 | val = target_read_memory (addr, old_contents, bplen); |
215 | ||
216 | /* If our breakpoint is no longer at the address, this means that the | |
217 | program modified the code on us, so it is wrong to put back the | |
218 | old value */ | |
219 | if (val == 0 && memcmp (bp, old_contents, bplen) == 0) | |
8181d85f | 220 | val = target_write_memory (addr, bp_tgt->shadow_contents, bplen); |
482ca3f5 | 221 | |
8defab1a | 222 | do_cleanups (cleanup); |
482ca3f5 KB |
223 | return val; |
224 | } | |
6ded7999 | 225 | |
b9ff3018 AC |
226 | /* For historic reasons, PPC 32 GNU/Linux follows PowerOpen rather |
227 | than the 32 bit SYSV R4 ABI structure return convention - all | |
228 | structures, no matter their size, are put in memory. Vectors, | |
229 | which were added later, do get returned in a register though. */ | |
230 | ||
05580c65 | 231 | static enum return_value_convention |
c055b101 CV |
232 | ppc_linux_return_value (struct gdbarch *gdbarch, struct type *func_type, |
233 | struct type *valtype, struct regcache *regcache, | |
234 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
b9ff3018 | 235 | { |
05580c65 AC |
236 | if ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT |
237 | || TYPE_CODE (valtype) == TYPE_CODE_UNION) | |
238 | && !((TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 8) | |
239 | && TYPE_VECTOR (valtype))) | |
240 | return RETURN_VALUE_STRUCT_CONVENTION; | |
241 | else | |
c055b101 CV |
242 | return ppc_sysv_abi_return_value (gdbarch, func_type, valtype, regcache, |
243 | readbuf, writebuf); | |
b9ff3018 AC |
244 | } |
245 | ||
f470a70a JB |
246 | /* Macros for matching instructions. Note that, since all the |
247 | operands are masked off before they're or-ed into the instruction, | |
248 | you can use -1 to make masks. */ | |
249 | ||
250 | #define insn_d(opcd, rts, ra, d) \ | |
251 | ((((opcd) & 0x3f) << 26) \ | |
252 | | (((rts) & 0x1f) << 21) \ | |
253 | | (((ra) & 0x1f) << 16) \ | |
254 | | ((d) & 0xffff)) | |
255 | ||
256 | #define insn_ds(opcd, rts, ra, d, xo) \ | |
257 | ((((opcd) & 0x3f) << 26) \ | |
258 | | (((rts) & 0x1f) << 21) \ | |
259 | | (((ra) & 0x1f) << 16) \ | |
260 | | ((d) & 0xfffc) \ | |
261 | | ((xo) & 0x3)) | |
262 | ||
263 | #define insn_xfx(opcd, rts, spr, xo) \ | |
264 | ((((opcd) & 0x3f) << 26) \ | |
265 | | (((rts) & 0x1f) << 21) \ | |
266 | | (((spr) & 0x1f) << 16) \ | |
267 | | (((spr) & 0x3e0) << 6) \ | |
268 | | (((xo) & 0x3ff) << 1)) | |
269 | ||
270 | /* Read a PPC instruction from memory. PPC instructions are always | |
271 | big-endian, no matter what endianness the program is running in, so | |
272 | we can't use read_memory_integer or one of its friends here. */ | |
273 | static unsigned int | |
274 | read_insn (CORE_ADDR pc) | |
275 | { | |
276 | unsigned char buf[4]; | |
277 | ||
278 | read_memory (pc, buf, 4); | |
279 | return (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3]; | |
280 | } | |
281 | ||
282 | ||
283 | /* An instruction to match. */ | |
284 | struct insn_pattern | |
285 | { | |
286 | unsigned int mask; /* mask the insn with this... */ | |
287 | unsigned int data; /* ...and see if it matches this. */ | |
288 | int optional; /* If non-zero, this insn may be absent. */ | |
289 | }; | |
290 | ||
291 | /* Return non-zero if the instructions at PC match the series | |
292 | described in PATTERN, or zero otherwise. PATTERN is an array of | |
293 | 'struct insn_pattern' objects, terminated by an entry whose mask is | |
294 | zero. | |
295 | ||
296 | When the match is successful, fill INSN[i] with what PATTERN[i] | |
297 | matched. If PATTERN[i] is optional, and the instruction wasn't | |
298 | present, set INSN[i] to 0 (which is not a valid PPC instruction). | |
299 | INSN should have as many elements as PATTERN. Note that, if | |
300 | PATTERN contains optional instructions which aren't present in | |
301 | memory, then INSN will have holes, so INSN[i] isn't necessarily the | |
302 | i'th instruction in memory. */ | |
303 | static int | |
304 | insns_match_pattern (CORE_ADDR pc, | |
305 | struct insn_pattern *pattern, | |
306 | unsigned int *insn) | |
307 | { | |
308 | int i; | |
309 | ||
310 | for (i = 0; pattern[i].mask; i++) | |
311 | { | |
312 | insn[i] = read_insn (pc); | |
313 | if ((insn[i] & pattern[i].mask) == pattern[i].data) | |
314 | pc += 4; | |
315 | else if (pattern[i].optional) | |
316 | insn[i] = 0; | |
317 | else | |
318 | return 0; | |
319 | } | |
320 | ||
321 | return 1; | |
322 | } | |
323 | ||
324 | ||
325 | /* Return the 'd' field of the d-form instruction INSN, properly | |
326 | sign-extended. */ | |
327 | static CORE_ADDR | |
328 | insn_d_field (unsigned int insn) | |
329 | { | |
330 | return ((((CORE_ADDR) insn & 0xffff) ^ 0x8000) - 0x8000); | |
331 | } | |
332 | ||
333 | ||
334 | /* Return the 'ds' field of the ds-form instruction INSN, with the two | |
335 | zero bits concatenated at the right, and properly | |
336 | sign-extended. */ | |
337 | static CORE_ADDR | |
338 | insn_ds_field (unsigned int insn) | |
339 | { | |
340 | return ((((CORE_ADDR) insn & 0xfffc) ^ 0x8000) - 0x8000); | |
341 | } | |
342 | ||
343 | ||
e538d2d7 | 344 | /* If DESC is the address of a 64-bit PowerPC GNU/Linux function |
d64558a5 JB |
345 | descriptor, return the descriptor's entry point. */ |
346 | static CORE_ADDR | |
e17a4113 | 347 | ppc64_desc_entry_point (struct gdbarch *gdbarch, CORE_ADDR desc) |
d64558a5 | 348 | { |
e17a4113 | 349 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
d64558a5 | 350 | /* The first word of the descriptor is the entry point. */ |
e17a4113 | 351 | return (CORE_ADDR) read_memory_unsigned_integer (desc, 8, byte_order); |
d64558a5 JB |
352 | } |
353 | ||
354 | ||
f470a70a JB |
355 | /* Pattern for the standard linkage function. These are built by |
356 | build_plt_stub in elf64-ppc.c, whose GLINK argument is always | |
357 | zero. */ | |
42848c96 | 358 | static struct insn_pattern ppc64_standard_linkage1[] = |
f470a70a JB |
359 | { |
360 | /* addis r12, r2, <any> */ | |
361 | { insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 }, | |
362 | ||
363 | /* std r2, 40(r1) */ | |
364 | { -1, insn_ds (62, 2, 1, 40, 0), 0 }, | |
365 | ||
366 | /* ld r11, <any>(r12) */ | |
367 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 }, | |
368 | ||
369 | /* addis r12, r12, 1 <optional> */ | |
42848c96 | 370 | { insn_d (-1, -1, -1, -1), insn_d (15, 12, 12, 1), 1 }, |
f470a70a JB |
371 | |
372 | /* ld r2, <any>(r12) */ | |
373 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 12, 0, 0), 0 }, | |
374 | ||
375 | /* addis r12, r12, 1 <optional> */ | |
42848c96 | 376 | { insn_d (-1, -1, -1, -1), insn_d (15, 12, 12, 1), 1 }, |
f470a70a JB |
377 | |
378 | /* mtctr r11 */ | |
42848c96 | 379 | { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 }, |
f470a70a JB |
380 | |
381 | /* ld r11, <any>(r12) */ | |
382 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 }, | |
383 | ||
384 | /* bctr */ | |
385 | { -1, 0x4e800420, 0 }, | |
386 | ||
387 | { 0, 0, 0 } | |
388 | }; | |
42848c96 UW |
389 | #define PPC64_STANDARD_LINKAGE1_LEN \ |
390 | (sizeof (ppc64_standard_linkage1) / sizeof (ppc64_standard_linkage1[0])) | |
391 | ||
392 | static struct insn_pattern ppc64_standard_linkage2[] = | |
393 | { | |
394 | /* addis r12, r2, <any> */ | |
395 | { insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 }, | |
396 | ||
397 | /* std r2, 40(r1) */ | |
398 | { -1, insn_ds (62, 2, 1, 40, 0), 0 }, | |
399 | ||
400 | /* ld r11, <any>(r12) */ | |
401 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 }, | |
402 | ||
403 | /* addi r12, r12, <any> <optional> */ | |
404 | { insn_d (-1, -1, -1, 0), insn_d (14, 12, 12, 0), 1 }, | |
405 | ||
406 | /* mtctr r11 */ | |
407 | { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 }, | |
408 | ||
409 | /* ld r2, <any>(r12) */ | |
410 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 12, 0, 0), 0 }, | |
411 | ||
412 | /* ld r11, <any>(r12) */ | |
413 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 }, | |
414 | ||
415 | /* bctr */ | |
416 | { -1, 0x4e800420, 0 }, | |
417 | ||
418 | { 0, 0, 0 } | |
419 | }; | |
420 | #define PPC64_STANDARD_LINKAGE2_LEN \ | |
421 | (sizeof (ppc64_standard_linkage2) / sizeof (ppc64_standard_linkage2[0])) | |
422 | ||
423 | static struct insn_pattern ppc64_standard_linkage3[] = | |
424 | { | |
425 | /* std r2, 40(r1) */ | |
426 | { -1, insn_ds (62, 2, 1, 40, 0), 0 }, | |
427 | ||
428 | /* ld r11, <any>(r2) */ | |
429 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 0 }, | |
430 | ||
431 | /* addi r2, r2, <any> <optional> */ | |
432 | { insn_d (-1, -1, -1, 0), insn_d (14, 2, 2, 0), 1 }, | |
433 | ||
434 | /* mtctr r11 */ | |
435 | { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 }, | |
436 | ||
437 | /* ld r11, <any>(r2) */ | |
438 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 0 }, | |
439 | ||
440 | /* ld r2, <any>(r2) */ | |
441 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 2, 0, 0), 0 }, | |
442 | ||
443 | /* bctr */ | |
444 | { -1, 0x4e800420, 0 }, | |
445 | ||
446 | { 0, 0, 0 } | |
447 | }; | |
448 | #define PPC64_STANDARD_LINKAGE3_LEN \ | |
449 | (sizeof (ppc64_standard_linkage3) / sizeof (ppc64_standard_linkage3[0])) | |
450 | ||
f470a70a | 451 | |
f470a70a JB |
452 | /* When the dynamic linker is doing lazy symbol resolution, the first |
453 | call to a function in another object will go like this: | |
454 | ||
455 | - The user's function calls the linkage function: | |
456 | ||
457 | 100007c4: 4b ff fc d5 bl 10000498 | |
458 | 100007c8: e8 41 00 28 ld r2,40(r1) | |
459 | ||
460 | - The linkage function loads the entry point (and other stuff) from | |
461 | the function descriptor in the PLT, and jumps to it: | |
462 | ||
463 | 10000498: 3d 82 00 00 addis r12,r2,0 | |
464 | 1000049c: f8 41 00 28 std r2,40(r1) | |
465 | 100004a0: e9 6c 80 98 ld r11,-32616(r12) | |
466 | 100004a4: e8 4c 80 a0 ld r2,-32608(r12) | |
467 | 100004a8: 7d 69 03 a6 mtctr r11 | |
468 | 100004ac: e9 6c 80 a8 ld r11,-32600(r12) | |
469 | 100004b0: 4e 80 04 20 bctr | |
470 | ||
471 | - But since this is the first time that PLT entry has been used, it | |
472 | sends control to its glink entry. That loads the number of the | |
473 | PLT entry and jumps to the common glink0 code: | |
474 | ||
475 | 10000c98: 38 00 00 00 li r0,0 | |
476 | 10000c9c: 4b ff ff dc b 10000c78 | |
477 | ||
478 | - The common glink0 code then transfers control to the dynamic | |
479 | linker's fixup code: | |
480 | ||
481 | 10000c78: e8 41 00 28 ld r2,40(r1) | |
482 | 10000c7c: 3d 82 00 00 addis r12,r2,0 | |
483 | 10000c80: e9 6c 80 80 ld r11,-32640(r12) | |
484 | 10000c84: e8 4c 80 88 ld r2,-32632(r12) | |
485 | 10000c88: 7d 69 03 a6 mtctr r11 | |
486 | 10000c8c: e9 6c 80 90 ld r11,-32624(r12) | |
487 | 10000c90: 4e 80 04 20 bctr | |
488 | ||
489 | Eventually, this code will figure out how to skip all of this, | |
490 | including the dynamic linker. At the moment, we just get through | |
491 | the linkage function. */ | |
492 | ||
493 | /* If the current thread is about to execute a series of instructions | |
494 | at PC matching the ppc64_standard_linkage pattern, and INSN is the result | |
495 | from that pattern match, return the code address to which the | |
496 | standard linkage function will send them. (This doesn't deal with | |
497 | dynamic linker lazy symbol resolution stubs.) */ | |
498 | static CORE_ADDR | |
42848c96 UW |
499 | ppc64_standard_linkage1_target (struct frame_info *frame, |
500 | CORE_ADDR pc, unsigned int *insn) | |
f470a70a | 501 | { |
e17a4113 UW |
502 | struct gdbarch *gdbarch = get_frame_arch (frame); |
503 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
f470a70a JB |
504 | |
505 | /* The address of the function descriptor this linkage function | |
506 | references. */ | |
507 | CORE_ADDR desc | |
52f729a7 UW |
508 | = ((CORE_ADDR) get_frame_register_unsigned (frame, |
509 | tdep->ppc_gp0_regnum + 2) | |
f470a70a JB |
510 | + (insn_d_field (insn[0]) << 16) |
511 | + insn_ds_field (insn[2])); | |
512 | ||
513 | /* The first word of the descriptor is the entry point. Return that. */ | |
e17a4113 | 514 | return ppc64_desc_entry_point (gdbarch, desc); |
f470a70a JB |
515 | } |
516 | ||
6207416c | 517 | static struct core_regset_section ppc_linux_vsx_regset_sections[] = |
17ea7499 CES |
518 | { |
519 | { ".reg", 268 }, | |
520 | { ".reg2", 264 }, | |
521 | { ".reg-ppc-vmx", 544 }, | |
604c2f83 | 522 | { ".reg-ppc-vsx", 256 }, |
17ea7499 CES |
523 | { NULL, 0} |
524 | }; | |
525 | ||
6207416c LM |
526 | static struct core_regset_section ppc_linux_vmx_regset_sections[] = |
527 | { | |
528 | { ".reg", 268 }, | |
529 | { ".reg2", 264 }, | |
530 | { ".reg-ppc-vmx", 544 }, | |
531 | { NULL, 0} | |
532 | }; | |
533 | ||
534 | static struct core_regset_section ppc_linux_fp_regset_sections[] = | |
535 | { | |
536 | { ".reg", 268 }, | |
537 | { ".reg2", 264 }, | |
538 | { NULL, 0} | |
539 | }; | |
540 | ||
42848c96 UW |
541 | static CORE_ADDR |
542 | ppc64_standard_linkage2_target (struct frame_info *frame, | |
543 | CORE_ADDR pc, unsigned int *insn) | |
544 | { | |
e17a4113 UW |
545 | struct gdbarch *gdbarch = get_frame_arch (frame); |
546 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
42848c96 UW |
547 | |
548 | /* The address of the function descriptor this linkage function | |
549 | references. */ | |
550 | CORE_ADDR desc | |
551 | = ((CORE_ADDR) get_frame_register_unsigned (frame, | |
552 | tdep->ppc_gp0_regnum + 2) | |
553 | + (insn_d_field (insn[0]) << 16) | |
554 | + insn_ds_field (insn[2])); | |
555 | ||
556 | /* The first word of the descriptor is the entry point. Return that. */ | |
e17a4113 | 557 | return ppc64_desc_entry_point (gdbarch, desc); |
42848c96 UW |
558 | } |
559 | ||
560 | static CORE_ADDR | |
561 | ppc64_standard_linkage3_target (struct frame_info *frame, | |
562 | CORE_ADDR pc, unsigned int *insn) | |
563 | { | |
e17a4113 UW |
564 | struct gdbarch *gdbarch = get_frame_arch (frame); |
565 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
42848c96 UW |
566 | |
567 | /* The address of the function descriptor this linkage function | |
568 | references. */ | |
569 | CORE_ADDR desc | |
570 | = ((CORE_ADDR) get_frame_register_unsigned (frame, | |
571 | tdep->ppc_gp0_regnum + 2) | |
572 | + insn_ds_field (insn[1])); | |
573 | ||
574 | /* The first word of the descriptor is the entry point. Return that. */ | |
e17a4113 | 575 | return ppc64_desc_entry_point (gdbarch, desc); |
42848c96 UW |
576 | } |
577 | ||
f470a70a JB |
578 | |
579 | /* Given that we've begun executing a call trampoline at PC, return | |
580 | the entry point of the function the trampoline will go to. */ | |
581 | static CORE_ADDR | |
52f729a7 | 582 | ppc64_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) |
f470a70a | 583 | { |
42848c96 UW |
584 | unsigned int ppc64_standard_linkage1_insn[PPC64_STANDARD_LINKAGE1_LEN]; |
585 | unsigned int ppc64_standard_linkage2_insn[PPC64_STANDARD_LINKAGE2_LEN]; | |
586 | unsigned int ppc64_standard_linkage3_insn[PPC64_STANDARD_LINKAGE3_LEN]; | |
587 | CORE_ADDR target; | |
588 | ||
589 | if (insns_match_pattern (pc, ppc64_standard_linkage1, | |
590 | ppc64_standard_linkage1_insn)) | |
591 | pc = ppc64_standard_linkage1_target (frame, pc, | |
592 | ppc64_standard_linkage1_insn); | |
593 | else if (insns_match_pattern (pc, ppc64_standard_linkage2, | |
594 | ppc64_standard_linkage2_insn)) | |
595 | pc = ppc64_standard_linkage2_target (frame, pc, | |
596 | ppc64_standard_linkage2_insn); | |
597 | else if (insns_match_pattern (pc, ppc64_standard_linkage3, | |
598 | ppc64_standard_linkage3_insn)) | |
599 | pc = ppc64_standard_linkage3_target (frame, pc, | |
600 | ppc64_standard_linkage3_insn); | |
f470a70a JB |
601 | else |
602 | return 0; | |
42848c96 UW |
603 | |
604 | /* The PLT descriptor will either point to the already resolved target | |
605 | address, or else to a glink stub. As the latter carry synthetic @plt | |
606 | symbols, find_solib_trampoline_target should be able to resolve them. */ | |
607 | target = find_solib_trampoline_target (frame, pc); | |
608 | return target? target : pc; | |
f470a70a JB |
609 | } |
610 | ||
611 | ||
00d5f93a | 612 | /* Support for convert_from_func_ptr_addr (ARCH, ADDR, TARG) on PPC64 |
e2d0e7eb | 613 | GNU/Linux. |
02631ec0 JB |
614 | |
615 | Usually a function pointer's representation is simply the address | |
2bbe3cc1 DJ |
616 | of the function. On GNU/Linux on the PowerPC however, a function |
617 | pointer may be a pointer to a function descriptor. | |
618 | ||
619 | For PPC64, a function descriptor is a TOC entry, in a data section, | |
620 | which contains three words: the first word is the address of the | |
621 | function, the second word is the TOC pointer (r2), and the third word | |
622 | is the static chain value. | |
623 | ||
2bbe3cc1 DJ |
624 | Throughout GDB it is currently assumed that a function pointer contains |
625 | the address of the function, which is not easy to fix. In addition, the | |
e538d2d7 JB |
626 | conversion of a function address to a function pointer would |
627 | require allocation of a TOC entry in the inferior's memory space, | |
628 | with all its drawbacks. To be able to call C++ virtual methods in | |
629 | the inferior (which are called via function pointers), | |
630 | find_function_addr uses this function to get the function address | |
2bbe3cc1 | 631 | from a function pointer. |
02631ec0 | 632 | |
2bbe3cc1 DJ |
633 | If ADDR points at what is clearly a function descriptor, transform |
634 | it into the address of the corresponding function, if needed. Be | |
635 | conservative, otherwise GDB will do the transformation on any | |
636 | random addresses such as occur when there is no symbol table. */ | |
02631ec0 JB |
637 | |
638 | static CORE_ADDR | |
00d5f93a UW |
639 | ppc64_linux_convert_from_func_ptr_addr (struct gdbarch *gdbarch, |
640 | CORE_ADDR addr, | |
641 | struct target_ops *targ) | |
02631ec0 | 642 | { |
e17a4113 | 643 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0542c86d | 644 | struct target_section *s = target_section_by_addr (targ, addr); |
02631ec0 | 645 | |
9b540880 | 646 | /* Check if ADDR points to a function descriptor. */ |
00d5f93a | 647 | if (s && strcmp (s->the_bfd_section->name, ".opd") == 0) |
e84ee240 UW |
648 | { |
649 | /* There may be relocations that need to be applied to the .opd | |
650 | section. Unfortunately, this function may be called at a time | |
651 | where these relocations have not yet been performed -- this can | |
652 | happen for example shortly after a library has been loaded with | |
653 | dlopen, but ld.so has not yet applied the relocations. | |
654 | ||
655 | To cope with both the case where the relocation has been applied, | |
656 | and the case where it has not yet been applied, we do *not* read | |
657 | the (maybe) relocated value from target memory, but we instead | |
658 | read the non-relocated value from the BFD, and apply the relocation | |
659 | offset manually. | |
660 | ||
661 | This makes the assumption that all .opd entries are always relocated | |
662 | by the same offset the section itself was relocated. This should | |
663 | always be the case for GNU/Linux executables and shared libraries. | |
664 | Note that other kind of object files (e.g. those added via | |
665 | add-symbol-files) will currently never end up here anyway, as this | |
666 | function accesses *target* sections only; only the main exec and | |
667 | shared libraries are ever added to the target. */ | |
668 | ||
669 | gdb_byte buf[8]; | |
670 | int res; | |
671 | ||
672 | res = bfd_get_section_contents (s->bfd, s->the_bfd_section, | |
673 | &buf, addr - s->addr, 8); | |
674 | if (res != 0) | |
e17a4113 | 675 | return extract_unsigned_integer (buf, 8, byte_order) |
e84ee240 UW |
676 | - bfd_section_vma (s->bfd, s->the_bfd_section) + s->addr; |
677 | } | |
9b540880 AC |
678 | |
679 | return addr; | |
02631ec0 JB |
680 | } |
681 | ||
7284e1be UW |
682 | /* Wrappers to handle Linux-only registers. */ |
683 | ||
684 | static void | |
685 | ppc_linux_supply_gregset (const struct regset *regset, | |
686 | struct regcache *regcache, | |
687 | int regnum, const void *gregs, size_t len) | |
688 | { | |
689 | const struct ppc_reg_offsets *offsets = regset->descr; | |
690 | ||
691 | ppc_supply_gregset (regset, regcache, regnum, gregs, len); | |
692 | ||
693 | if (ppc_linux_trap_reg_p (get_regcache_arch (regcache))) | |
694 | { | |
695 | /* "orig_r3" is stored 2 slots after "pc". */ | |
696 | if (regnum == -1 || regnum == PPC_ORIG_R3_REGNUM) | |
697 | ppc_supply_reg (regcache, PPC_ORIG_R3_REGNUM, gregs, | |
698 | offsets->pc_offset + 2 * offsets->gpr_size, | |
699 | offsets->gpr_size); | |
700 | ||
701 | /* "trap" is stored 8 slots after "pc". */ | |
702 | if (regnum == -1 || regnum == PPC_TRAP_REGNUM) | |
703 | ppc_supply_reg (regcache, PPC_TRAP_REGNUM, gregs, | |
704 | offsets->pc_offset + 8 * offsets->gpr_size, | |
705 | offsets->gpr_size); | |
706 | } | |
707 | } | |
f2db237a | 708 | |
f9be684a | 709 | static void |
f2db237a AM |
710 | ppc_linux_collect_gregset (const struct regset *regset, |
711 | const struct regcache *regcache, | |
712 | int regnum, void *gregs, size_t len) | |
f9be684a | 713 | { |
7284e1be UW |
714 | const struct ppc_reg_offsets *offsets = regset->descr; |
715 | ||
716 | /* Clear areas in the linux gregset not written elsewhere. */ | |
f2db237a AM |
717 | if (regnum == -1) |
718 | memset (gregs, 0, len); | |
7284e1be | 719 | |
f2db237a | 720 | ppc_collect_gregset (regset, regcache, regnum, gregs, len); |
7284e1be UW |
721 | |
722 | if (ppc_linux_trap_reg_p (get_regcache_arch (regcache))) | |
723 | { | |
724 | /* "orig_r3" is stored 2 slots after "pc". */ | |
725 | if (regnum == -1 || regnum == PPC_ORIG_R3_REGNUM) | |
726 | ppc_collect_reg (regcache, PPC_ORIG_R3_REGNUM, gregs, | |
727 | offsets->pc_offset + 2 * offsets->gpr_size, | |
728 | offsets->gpr_size); | |
729 | ||
730 | /* "trap" is stored 8 slots after "pc". */ | |
731 | if (regnum == -1 || regnum == PPC_TRAP_REGNUM) | |
732 | ppc_collect_reg (regcache, PPC_TRAP_REGNUM, gregs, | |
733 | offsets->pc_offset + 8 * offsets->gpr_size, | |
734 | offsets->gpr_size); | |
735 | } | |
f9be684a AC |
736 | } |
737 | ||
f2db237a AM |
738 | /* Regset descriptions. */ |
739 | static const struct ppc_reg_offsets ppc32_linux_reg_offsets = | |
740 | { | |
741 | /* General-purpose registers. */ | |
742 | /* .r0_offset = */ 0, | |
743 | /* .gpr_size = */ 4, | |
744 | /* .xr_size = */ 4, | |
745 | /* .pc_offset = */ 128, | |
746 | /* .ps_offset = */ 132, | |
747 | /* .cr_offset = */ 152, | |
748 | /* .lr_offset = */ 144, | |
749 | /* .ctr_offset = */ 140, | |
750 | /* .xer_offset = */ 148, | |
751 | /* .mq_offset = */ 156, | |
752 | ||
753 | /* Floating-point registers. */ | |
754 | /* .f0_offset = */ 0, | |
755 | /* .fpscr_offset = */ 256, | |
756 | /* .fpscr_size = */ 8, | |
757 | ||
758 | /* AltiVec registers. */ | |
759 | /* .vr0_offset = */ 0, | |
06caf7d2 CES |
760 | /* .vscr_offset = */ 512 + 12, |
761 | /* .vrsave_offset = */ 528 | |
f2db237a | 762 | }; |
f9be684a | 763 | |
f2db237a AM |
764 | static const struct ppc_reg_offsets ppc64_linux_reg_offsets = |
765 | { | |
766 | /* General-purpose registers. */ | |
767 | /* .r0_offset = */ 0, | |
768 | /* .gpr_size = */ 8, | |
769 | /* .xr_size = */ 8, | |
770 | /* .pc_offset = */ 256, | |
771 | /* .ps_offset = */ 264, | |
772 | /* .cr_offset = */ 304, | |
773 | /* .lr_offset = */ 288, | |
774 | /* .ctr_offset = */ 280, | |
775 | /* .xer_offset = */ 296, | |
776 | /* .mq_offset = */ 312, | |
777 | ||
778 | /* Floating-point registers. */ | |
779 | /* .f0_offset = */ 0, | |
780 | /* .fpscr_offset = */ 256, | |
781 | /* .fpscr_size = */ 8, | |
782 | ||
783 | /* AltiVec registers. */ | |
784 | /* .vr0_offset = */ 0, | |
06caf7d2 CES |
785 | /* .vscr_offset = */ 512 + 12, |
786 | /* .vrsave_offset = */ 528 | |
f2db237a | 787 | }; |
2fda4977 | 788 | |
f2db237a AM |
789 | static const struct regset ppc32_linux_gregset = { |
790 | &ppc32_linux_reg_offsets, | |
7284e1be | 791 | ppc_linux_supply_gregset, |
f2db237a AM |
792 | ppc_linux_collect_gregset, |
793 | NULL | |
f9be684a AC |
794 | }; |
795 | ||
f2db237a AM |
796 | static const struct regset ppc64_linux_gregset = { |
797 | &ppc64_linux_reg_offsets, | |
7284e1be | 798 | ppc_linux_supply_gregset, |
f2db237a AM |
799 | ppc_linux_collect_gregset, |
800 | NULL | |
801 | }; | |
f9be684a | 802 | |
f2db237a AM |
803 | static const struct regset ppc32_linux_fpregset = { |
804 | &ppc32_linux_reg_offsets, | |
805 | ppc_supply_fpregset, | |
806 | ppc_collect_fpregset, | |
807 | NULL | |
f9be684a AC |
808 | }; |
809 | ||
06caf7d2 CES |
810 | static const struct regset ppc32_linux_vrregset = { |
811 | &ppc32_linux_reg_offsets, | |
812 | ppc_supply_vrregset, | |
813 | ppc_collect_vrregset, | |
814 | NULL | |
815 | }; | |
816 | ||
604c2f83 LM |
817 | static const struct regset ppc32_linux_vsxregset = { |
818 | &ppc32_linux_reg_offsets, | |
819 | ppc_supply_vsxregset, | |
820 | ppc_collect_vsxregset, | |
821 | NULL | |
822 | }; | |
823 | ||
f2db237a AM |
824 | const struct regset * |
825 | ppc_linux_gregset (int wordsize) | |
2fda4977 | 826 | { |
f2db237a | 827 | return wordsize == 8 ? &ppc64_linux_gregset : &ppc32_linux_gregset; |
2fda4977 DJ |
828 | } |
829 | ||
f2db237a AM |
830 | const struct regset * |
831 | ppc_linux_fpregset (void) | |
832 | { | |
833 | return &ppc32_linux_fpregset; | |
834 | } | |
2fda4977 | 835 | |
f9be684a AC |
836 | static const struct regset * |
837 | ppc_linux_regset_from_core_section (struct gdbarch *core_arch, | |
838 | const char *sect_name, size_t sect_size) | |
2fda4977 | 839 | { |
f9be684a AC |
840 | struct gdbarch_tdep *tdep = gdbarch_tdep (core_arch); |
841 | if (strcmp (sect_name, ".reg") == 0) | |
2fda4977 | 842 | { |
f9be684a AC |
843 | if (tdep->wordsize == 4) |
844 | return &ppc32_linux_gregset; | |
2fda4977 | 845 | else |
f9be684a | 846 | return &ppc64_linux_gregset; |
2fda4977 | 847 | } |
f9be684a | 848 | if (strcmp (sect_name, ".reg2") == 0) |
f2db237a | 849 | return &ppc32_linux_fpregset; |
06caf7d2 CES |
850 | if (strcmp (sect_name, ".reg-ppc-vmx") == 0) |
851 | return &ppc32_linux_vrregset; | |
604c2f83 LM |
852 | if (strcmp (sect_name, ".reg-ppc-vsx") == 0) |
853 | return &ppc32_linux_vsxregset; | |
f9be684a | 854 | return NULL; |
2fda4977 DJ |
855 | } |
856 | ||
a8f60bfc | 857 | static void |
5366653e | 858 | ppc_linux_sigtramp_cache (struct frame_info *this_frame, |
a8f60bfc AC |
859 | struct trad_frame_cache *this_cache, |
860 | CORE_ADDR func, LONGEST offset, | |
861 | int bias) | |
862 | { | |
863 | CORE_ADDR base; | |
864 | CORE_ADDR regs; | |
865 | CORE_ADDR gpregs; | |
866 | CORE_ADDR fpregs; | |
867 | int i; | |
5366653e | 868 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
a8f60bfc | 869 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
e17a4113 | 870 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
a8f60bfc | 871 | |
5366653e DJ |
872 | base = get_frame_register_unsigned (this_frame, |
873 | gdbarch_sp_regnum (gdbarch)); | |
874 | if (bias > 0 && get_frame_pc (this_frame) != func) | |
a8f60bfc AC |
875 | /* See below, some signal trampolines increment the stack as their |
876 | first instruction, need to compensate for that. */ | |
877 | base -= bias; | |
878 | ||
879 | /* Find the address of the register buffer pointer. */ | |
880 | regs = base + offset; | |
881 | /* Use that to find the address of the corresponding register | |
882 | buffers. */ | |
e17a4113 | 883 | gpregs = read_memory_unsigned_integer (regs, tdep->wordsize, byte_order); |
a8f60bfc AC |
884 | fpregs = gpregs + 48 * tdep->wordsize; |
885 | ||
886 | /* General purpose. */ | |
887 | for (i = 0; i < 32; i++) | |
888 | { | |
889 | int regnum = i + tdep->ppc_gp0_regnum; | |
890 | trad_frame_set_reg_addr (this_cache, regnum, gpregs + i * tdep->wordsize); | |
891 | } | |
3e8c568d | 892 | trad_frame_set_reg_addr (this_cache, |
40a6adc1 | 893 | gdbarch_pc_regnum (gdbarch), |
3e8c568d | 894 | gpregs + 32 * tdep->wordsize); |
a8f60bfc AC |
895 | trad_frame_set_reg_addr (this_cache, tdep->ppc_ctr_regnum, |
896 | gpregs + 35 * tdep->wordsize); | |
897 | trad_frame_set_reg_addr (this_cache, tdep->ppc_lr_regnum, | |
898 | gpregs + 36 * tdep->wordsize); | |
899 | trad_frame_set_reg_addr (this_cache, tdep->ppc_xer_regnum, | |
900 | gpregs + 37 * tdep->wordsize); | |
901 | trad_frame_set_reg_addr (this_cache, tdep->ppc_cr_regnum, | |
902 | gpregs + 38 * tdep->wordsize); | |
903 | ||
7284e1be UW |
904 | if (ppc_linux_trap_reg_p (gdbarch)) |
905 | { | |
906 | trad_frame_set_reg_addr (this_cache, PPC_ORIG_R3_REGNUM, | |
907 | gpregs + 34 * tdep->wordsize); | |
908 | trad_frame_set_reg_addr (this_cache, PPC_TRAP_REGNUM, | |
909 | gpregs + 40 * tdep->wordsize); | |
910 | } | |
911 | ||
60f140f9 PG |
912 | if (ppc_floating_point_unit_p (gdbarch)) |
913 | { | |
914 | /* Floating point registers. */ | |
915 | for (i = 0; i < 32; i++) | |
916 | { | |
40a6adc1 | 917 | int regnum = i + gdbarch_fp0_regnum (gdbarch); |
60f140f9 PG |
918 | trad_frame_set_reg_addr (this_cache, regnum, |
919 | fpregs + i * tdep->wordsize); | |
920 | } | |
921 | trad_frame_set_reg_addr (this_cache, tdep->ppc_fpscr_regnum, | |
4019046a | 922 | fpregs + 32 * tdep->wordsize); |
60f140f9 | 923 | } |
a8f60bfc AC |
924 | trad_frame_set_id (this_cache, frame_id_build (base, func)); |
925 | } | |
926 | ||
927 | static void | |
928 | ppc32_linux_sigaction_cache_init (const struct tramp_frame *self, | |
5366653e | 929 | struct frame_info *this_frame, |
a8f60bfc AC |
930 | struct trad_frame_cache *this_cache, |
931 | CORE_ADDR func) | |
932 | { | |
5366653e | 933 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
a8f60bfc AC |
934 | 0xd0 /* Offset to ucontext_t. */ |
935 | + 0x30 /* Offset to .reg. */, | |
936 | 0); | |
937 | } | |
938 | ||
939 | static void | |
940 | ppc64_linux_sigaction_cache_init (const struct tramp_frame *self, | |
5366653e | 941 | struct frame_info *this_frame, |
a8f60bfc AC |
942 | struct trad_frame_cache *this_cache, |
943 | CORE_ADDR func) | |
944 | { | |
5366653e | 945 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
a8f60bfc AC |
946 | 0x80 /* Offset to ucontext_t. */ |
947 | + 0xe0 /* Offset to .reg. */, | |
948 | 128); | |
949 | } | |
950 | ||
951 | static void | |
952 | ppc32_linux_sighandler_cache_init (const struct tramp_frame *self, | |
5366653e | 953 | struct frame_info *this_frame, |
a8f60bfc AC |
954 | struct trad_frame_cache *this_cache, |
955 | CORE_ADDR func) | |
956 | { | |
5366653e | 957 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
a8f60bfc AC |
958 | 0x40 /* Offset to ucontext_t. */ |
959 | + 0x1c /* Offset to .reg. */, | |
960 | 0); | |
961 | } | |
962 | ||
963 | static void | |
964 | ppc64_linux_sighandler_cache_init (const struct tramp_frame *self, | |
5366653e | 965 | struct frame_info *this_frame, |
a8f60bfc AC |
966 | struct trad_frame_cache *this_cache, |
967 | CORE_ADDR func) | |
968 | { | |
5366653e | 969 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
a8f60bfc AC |
970 | 0x80 /* Offset to struct sigcontext. */ |
971 | + 0x38 /* Offset to .reg. */, | |
972 | 128); | |
973 | } | |
974 | ||
975 | static struct tramp_frame ppc32_linux_sigaction_tramp_frame = { | |
976 | SIGTRAMP_FRAME, | |
977 | 4, | |
978 | { | |
979 | { 0x380000ac, -1 }, /* li r0, 172 */ | |
980 | { 0x44000002, -1 }, /* sc */ | |
981 | { TRAMP_SENTINEL_INSN }, | |
982 | }, | |
983 | ppc32_linux_sigaction_cache_init | |
984 | }; | |
985 | static struct tramp_frame ppc64_linux_sigaction_tramp_frame = { | |
986 | SIGTRAMP_FRAME, | |
987 | 4, | |
988 | { | |
989 | { 0x38210080, -1 }, /* addi r1,r1,128 */ | |
990 | { 0x380000ac, -1 }, /* li r0, 172 */ | |
991 | { 0x44000002, -1 }, /* sc */ | |
992 | { TRAMP_SENTINEL_INSN }, | |
993 | }, | |
994 | ppc64_linux_sigaction_cache_init | |
995 | }; | |
996 | static struct tramp_frame ppc32_linux_sighandler_tramp_frame = { | |
997 | SIGTRAMP_FRAME, | |
998 | 4, | |
999 | { | |
1000 | { 0x38000077, -1 }, /* li r0,119 */ | |
1001 | { 0x44000002, -1 }, /* sc */ | |
1002 | { TRAMP_SENTINEL_INSN }, | |
1003 | }, | |
1004 | ppc32_linux_sighandler_cache_init | |
1005 | }; | |
1006 | static struct tramp_frame ppc64_linux_sighandler_tramp_frame = { | |
1007 | SIGTRAMP_FRAME, | |
1008 | 4, | |
1009 | { | |
1010 | { 0x38210080, -1 }, /* addi r1,r1,128 */ | |
1011 | { 0x38000077, -1 }, /* li r0,119 */ | |
1012 | { 0x44000002, -1 }, /* sc */ | |
1013 | { TRAMP_SENTINEL_INSN }, | |
1014 | }, | |
1015 | ppc64_linux_sighandler_cache_init | |
1016 | }; | |
1017 | ||
7284e1be | 1018 | |
85e747d2 UW |
1019 | /* Address to use for displaced stepping. When debugging a stand-alone |
1020 | SPU executable, entry_point_address () will point to an SPU local-store | |
1021 | address and is thus not usable as displaced stepping location. We use | |
1022 | the auxiliary vector to determine the PowerPC-side entry point address | |
1023 | instead. */ | |
1024 | ||
1025 | static CORE_ADDR ppc_linux_entry_point_addr = 0; | |
1026 | ||
1027 | static void | |
1028 | ppc_linux_inferior_created (struct target_ops *target, int from_tty) | |
1029 | { | |
1030 | ppc_linux_entry_point_addr = 0; | |
1031 | } | |
1032 | ||
1033 | static CORE_ADDR | |
1034 | ppc_linux_displaced_step_location (struct gdbarch *gdbarch) | |
1035 | { | |
1036 | if (ppc_linux_entry_point_addr == 0) | |
1037 | { | |
1038 | CORE_ADDR addr; | |
1039 | ||
1040 | /* Determine entry point from target auxiliary vector. */ | |
1041 | if (target_auxv_search (¤t_target, AT_ENTRY, &addr) <= 0) | |
1042 | error (_("Cannot find AT_ENTRY auxiliary vector entry.")); | |
1043 | ||
1044 | /* Make certain that the address points at real code, and not a | |
1045 | function descriptor. */ | |
1046 | addr = gdbarch_convert_from_func_ptr_addr (gdbarch, addr, | |
1047 | ¤t_target); | |
1048 | ||
1049 | /* Inferior calls also use the entry point as a breakpoint location. | |
1050 | We don't want displaced stepping to interfere with those | |
1051 | breakpoints, so leave space. */ | |
1052 | ppc_linux_entry_point_addr = addr + 2 * PPC_INSN_SIZE; | |
1053 | } | |
1054 | ||
1055 | return ppc_linux_entry_point_addr; | |
1056 | } | |
1057 | ||
1058 | ||
7284e1be UW |
1059 | /* Return 1 if PPC_ORIG_R3_REGNUM and PPC_TRAP_REGNUM are usable. */ |
1060 | int | |
1061 | ppc_linux_trap_reg_p (struct gdbarch *gdbarch) | |
1062 | { | |
1063 | /* If we do not have a target description with registers, then | |
1064 | the special registers will not be included in the register set. */ | |
1065 | if (!tdesc_has_registers (gdbarch_target_desc (gdbarch))) | |
1066 | return 0; | |
1067 | ||
1068 | /* If we do, then it is safe to check the size. */ | |
1069 | return register_size (gdbarch, PPC_ORIG_R3_REGNUM) > 0 | |
1070 | && register_size (gdbarch, PPC_TRAP_REGNUM) > 0; | |
1071 | } | |
1072 | ||
a96d9b2e SDJ |
1073 | /* Return the current system call's number present in the |
1074 | r0 register. When the function fails, it returns -1. */ | |
1075 | static LONGEST | |
1076 | ppc_linux_get_syscall_number (struct gdbarch *gdbarch, | |
1077 | ptid_t ptid) | |
1078 | { | |
1079 | struct regcache *regcache = get_thread_regcache (ptid); | |
1080 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1081 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1082 | struct cleanup *cleanbuf; | |
1083 | /* The content of a register */ | |
1084 | gdb_byte *buf; | |
1085 | /* The result */ | |
1086 | LONGEST ret; | |
1087 | ||
1088 | /* Make sure we're in a 32- or 64-bit machine */ | |
1089 | gdb_assert (tdep->wordsize == 4 || tdep->wordsize == 8); | |
1090 | ||
1091 | buf = (gdb_byte *) xmalloc (tdep->wordsize * sizeof (gdb_byte)); | |
1092 | ||
1093 | cleanbuf = make_cleanup (xfree, buf); | |
1094 | ||
1095 | /* Getting the system call number from the register. | |
1096 | When dealing with PowerPC architecture, this information | |
1097 | is stored at 0th register. */ | |
1098 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum, buf); | |
1099 | ||
1100 | ret = extract_signed_integer (buf, tdep->wordsize, byte_order); | |
1101 | do_cleanups (cleanbuf); | |
1102 | ||
1103 | return ret; | |
1104 | } | |
1105 | ||
7284e1be UW |
1106 | static void |
1107 | ppc_linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
1108 | { | |
1109 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1110 | ||
1111 | regcache_cooked_write_unsigned (regcache, gdbarch_pc_regnum (gdbarch), pc); | |
1112 | ||
1113 | /* Set special TRAP register to -1 to prevent the kernel from | |
1114 | messing with the PC we just installed, if we happen to be | |
1115 | within an interrupted system call that the kernel wants to | |
1116 | restart. | |
1117 | ||
1118 | Note that after we return from the dummy call, the TRAP and | |
1119 | ORIG_R3 registers will be automatically restored, and the | |
1120 | kernel continues to restart the system call at this point. */ | |
1121 | if (ppc_linux_trap_reg_p (gdbarch)) | |
1122 | regcache_cooked_write_unsigned (regcache, PPC_TRAP_REGNUM, -1); | |
1123 | } | |
1124 | ||
f4d9bade UW |
1125 | static int |
1126 | ppc_linux_spu_section (bfd *abfd, asection *asect, void *user_data) | |
1127 | { | |
1128 | return strncmp (bfd_section_name (abfd, asect), "SPU/", 4) == 0; | |
1129 | } | |
1130 | ||
7284e1be UW |
1131 | static const struct target_desc * |
1132 | ppc_linux_core_read_description (struct gdbarch *gdbarch, | |
1133 | struct target_ops *target, | |
1134 | bfd *abfd) | |
1135 | { | |
f4d9bade | 1136 | asection *cell = bfd_sections_find_if (abfd, ppc_linux_spu_section, NULL); |
7284e1be | 1137 | asection *altivec = bfd_get_section_by_name (abfd, ".reg-ppc-vmx"); |
604c2f83 | 1138 | asection *vsx = bfd_get_section_by_name (abfd, ".reg-ppc-vsx"); |
7284e1be UW |
1139 | asection *section = bfd_get_section_by_name (abfd, ".reg"); |
1140 | if (! section) | |
1141 | return NULL; | |
1142 | ||
1143 | switch (bfd_section_size (abfd, section)) | |
1144 | { | |
1145 | case 48 * 4: | |
f4d9bade UW |
1146 | if (cell) |
1147 | return tdesc_powerpc_cell32l; | |
1148 | else if (vsx) | |
604c2f83 LM |
1149 | return tdesc_powerpc_vsx32l; |
1150 | else if (altivec) | |
1151 | return tdesc_powerpc_altivec32l; | |
1152 | else | |
1153 | return tdesc_powerpc_32l; | |
7284e1be UW |
1154 | |
1155 | case 48 * 8: | |
f4d9bade UW |
1156 | if (cell) |
1157 | return tdesc_powerpc_cell64l; | |
1158 | else if (vsx) | |
604c2f83 LM |
1159 | return tdesc_powerpc_vsx64l; |
1160 | else if (altivec) | |
1161 | return tdesc_powerpc_altivec64l; | |
1162 | else | |
1163 | return tdesc_powerpc_64l; | |
7284e1be UW |
1164 | |
1165 | default: | |
1166 | return NULL; | |
1167 | } | |
1168 | } | |
1169 | ||
cc5f0d61 UW |
1170 | |
1171 | /* Cell/B.E. active SPE context tracking support. */ | |
1172 | ||
1173 | static struct objfile *spe_context_objfile = NULL; | |
1174 | static CORE_ADDR spe_context_lm_addr = 0; | |
1175 | static CORE_ADDR spe_context_offset = 0; | |
1176 | ||
1177 | static ptid_t spe_context_cache_ptid; | |
1178 | static CORE_ADDR spe_context_cache_address; | |
1179 | ||
1180 | /* Hook into inferior_created, solib_loaded, and solib_unloaded observers | |
1181 | to track whether we've loaded a version of libspe2 (as static or dynamic | |
1182 | library) that provides the __spe_current_active_context variable. */ | |
1183 | static void | |
1184 | ppc_linux_spe_context_lookup (struct objfile *objfile) | |
1185 | { | |
1186 | struct minimal_symbol *sym; | |
1187 | ||
1188 | if (!objfile) | |
1189 | { | |
1190 | spe_context_objfile = NULL; | |
1191 | spe_context_lm_addr = 0; | |
1192 | spe_context_offset = 0; | |
1193 | spe_context_cache_ptid = minus_one_ptid; | |
1194 | spe_context_cache_address = 0; | |
1195 | return; | |
1196 | } | |
1197 | ||
1198 | sym = lookup_minimal_symbol ("__spe_current_active_context", NULL, objfile); | |
1199 | if (sym) | |
1200 | { | |
1201 | spe_context_objfile = objfile; | |
1202 | spe_context_lm_addr = svr4_fetch_objfile_link_map (objfile); | |
1203 | spe_context_offset = SYMBOL_VALUE_ADDRESS (sym); | |
1204 | spe_context_cache_ptid = minus_one_ptid; | |
1205 | spe_context_cache_address = 0; | |
1206 | return; | |
1207 | } | |
1208 | } | |
1209 | ||
1210 | static void | |
1211 | ppc_linux_spe_context_inferior_created (struct target_ops *t, int from_tty) | |
1212 | { | |
1213 | struct objfile *objfile; | |
1214 | ||
1215 | ppc_linux_spe_context_lookup (NULL); | |
1216 | ALL_OBJFILES (objfile) | |
1217 | ppc_linux_spe_context_lookup (objfile); | |
1218 | } | |
1219 | ||
1220 | static void | |
1221 | ppc_linux_spe_context_solib_loaded (struct so_list *so) | |
1222 | { | |
1223 | if (strstr (so->so_original_name, "/libspe") != NULL) | |
1224 | { | |
1225 | solib_read_symbols (so, so->from_tty ? SYMFILE_VERBOSE : 0); | |
1226 | ppc_linux_spe_context_lookup (so->objfile); | |
1227 | } | |
1228 | } | |
1229 | ||
1230 | static void | |
1231 | ppc_linux_spe_context_solib_unloaded (struct so_list *so) | |
1232 | { | |
1233 | if (so->objfile == spe_context_objfile) | |
1234 | ppc_linux_spe_context_lookup (NULL); | |
1235 | } | |
1236 | ||
1237 | /* Retrieve contents of the N'th element in the current thread's | |
1238 | linked SPE context list into ID and NPC. Return the address of | |
1239 | said context element, or 0 if not found. */ | |
1240 | static CORE_ADDR | |
1241 | ppc_linux_spe_context (int wordsize, enum bfd_endian byte_order, | |
1242 | int n, int *id, unsigned int *npc) | |
1243 | { | |
1244 | CORE_ADDR spe_context = 0; | |
1245 | gdb_byte buf[16]; | |
1246 | int i; | |
1247 | ||
1248 | /* Quick exit if we have not found __spe_current_active_context. */ | |
1249 | if (!spe_context_objfile) | |
1250 | return 0; | |
1251 | ||
1252 | /* Look up cached address of thread-local variable. */ | |
1253 | if (!ptid_equal (spe_context_cache_ptid, inferior_ptid)) | |
1254 | { | |
1255 | struct target_ops *target = ¤t_target; | |
1256 | volatile struct gdb_exception ex; | |
1257 | ||
1258 | while (target && !target->to_get_thread_local_address) | |
1259 | target = find_target_beneath (target); | |
1260 | if (!target) | |
1261 | return 0; | |
1262 | ||
1263 | TRY_CATCH (ex, RETURN_MASK_ERROR) | |
1264 | { | |
1265 | /* We do not call target_translate_tls_address here, because | |
1266 | svr4_fetch_objfile_link_map may invalidate the frame chain, | |
1267 | which must not do while inside a frame sniffer. | |
1268 | ||
1269 | Instead, we have cached the lm_addr value, and use that to | |
1270 | directly call the target's to_get_thread_local_address. */ | |
1271 | spe_context_cache_address | |
1272 | = target->to_get_thread_local_address (target, inferior_ptid, | |
1273 | spe_context_lm_addr, | |
1274 | spe_context_offset); | |
1275 | spe_context_cache_ptid = inferior_ptid; | |
1276 | } | |
1277 | ||
1278 | if (ex.reason < 0) | |
1279 | return 0; | |
1280 | } | |
1281 | ||
1282 | /* Read variable value. */ | |
1283 | if (target_read_memory (spe_context_cache_address, buf, wordsize) == 0) | |
1284 | spe_context = extract_unsigned_integer (buf, wordsize, byte_order); | |
1285 | ||
1286 | /* Cyle through to N'th linked list element. */ | |
1287 | for (i = 0; i < n && spe_context; i++) | |
1288 | if (target_read_memory (spe_context + align_up (12, wordsize), | |
1289 | buf, wordsize) == 0) | |
1290 | spe_context = extract_unsigned_integer (buf, wordsize, byte_order); | |
1291 | else | |
1292 | spe_context = 0; | |
1293 | ||
1294 | /* Read current context. */ | |
1295 | if (spe_context | |
1296 | && target_read_memory (spe_context, buf, 12) != 0) | |
1297 | spe_context = 0; | |
1298 | ||
1299 | /* Extract data elements. */ | |
1300 | if (spe_context) | |
1301 | { | |
1302 | if (id) | |
1303 | *id = extract_signed_integer (buf, 4, byte_order); | |
1304 | if (npc) | |
1305 | *npc = extract_unsigned_integer (buf + 4, 4, byte_order); | |
1306 | } | |
1307 | ||
1308 | return spe_context; | |
1309 | } | |
1310 | ||
1311 | ||
1312 | /* Cell/B.E. cross-architecture unwinder support. */ | |
1313 | ||
1314 | struct ppu2spu_cache | |
1315 | { | |
1316 | struct frame_id frame_id; | |
1317 | struct regcache *regcache; | |
1318 | }; | |
1319 | ||
1320 | static struct gdbarch * | |
1321 | ppu2spu_prev_arch (struct frame_info *this_frame, void **this_cache) | |
1322 | { | |
1323 | struct ppu2spu_cache *cache = *this_cache; | |
1324 | return get_regcache_arch (cache->regcache); | |
1325 | } | |
1326 | ||
1327 | static void | |
1328 | ppu2spu_this_id (struct frame_info *this_frame, | |
1329 | void **this_cache, struct frame_id *this_id) | |
1330 | { | |
1331 | struct ppu2spu_cache *cache = *this_cache; | |
1332 | *this_id = cache->frame_id; | |
1333 | } | |
1334 | ||
1335 | static struct value * | |
1336 | ppu2spu_prev_register (struct frame_info *this_frame, | |
1337 | void **this_cache, int regnum) | |
1338 | { | |
1339 | struct ppu2spu_cache *cache = *this_cache; | |
1340 | struct gdbarch *gdbarch = get_regcache_arch (cache->regcache); | |
1341 | gdb_byte *buf; | |
1342 | ||
1343 | buf = alloca (register_size (gdbarch, regnum)); | |
1344 | regcache_cooked_read (cache->regcache, regnum, buf); | |
1345 | return frame_unwind_got_bytes (this_frame, regnum, buf); | |
1346 | } | |
1347 | ||
1348 | struct ppu2spu_data | |
1349 | { | |
1350 | struct gdbarch *gdbarch; | |
1351 | int id; | |
1352 | unsigned int npc; | |
1353 | gdb_byte gprs[128*16]; | |
1354 | }; | |
1355 | ||
1356 | static int | |
1357 | ppu2spu_unwind_register (void *src, int regnum, gdb_byte *buf) | |
1358 | { | |
1359 | struct ppu2spu_data *data = src; | |
1360 | enum bfd_endian byte_order = gdbarch_byte_order (data->gdbarch); | |
1361 | ||
1362 | if (regnum >= 0 && regnum < SPU_NUM_GPRS) | |
1363 | memcpy (buf, data->gprs + 16*regnum, 16); | |
1364 | else if (regnum == SPU_ID_REGNUM) | |
1365 | store_unsigned_integer (buf, 4, byte_order, data->id); | |
1366 | else if (regnum == SPU_PC_REGNUM) | |
1367 | store_unsigned_integer (buf, 4, byte_order, data->npc); | |
1368 | else | |
1369 | return 0; | |
1370 | ||
1371 | return 1; | |
1372 | } | |
1373 | ||
1374 | static int | |
1375 | ppu2spu_sniffer (const struct frame_unwind *self, | |
1376 | struct frame_info *this_frame, void **this_prologue_cache) | |
1377 | { | |
1378 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
1379 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1380 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1381 | struct ppu2spu_data data; | |
1382 | struct frame_info *fi; | |
1383 | CORE_ADDR base, func, backchain, spe_context; | |
1384 | gdb_byte buf[8]; | |
1385 | int n = 0; | |
1386 | ||
1387 | /* Count the number of SPU contexts already in the frame chain. */ | |
1388 | for (fi = get_next_frame (this_frame); fi; fi = get_next_frame (fi)) | |
1389 | if (get_frame_type (fi) == ARCH_FRAME | |
1390 | && gdbarch_bfd_arch_info (get_frame_arch (fi))->arch == bfd_arch_spu) | |
1391 | n++; | |
1392 | ||
1393 | base = get_frame_sp (this_frame); | |
1394 | func = get_frame_pc (this_frame); | |
1395 | if (target_read_memory (base, buf, tdep->wordsize)) | |
1396 | return 0; | |
1397 | backchain = extract_unsigned_integer (buf, tdep->wordsize, byte_order); | |
1398 | ||
1399 | spe_context = ppc_linux_spe_context (tdep->wordsize, byte_order, | |
1400 | n, &data.id, &data.npc); | |
1401 | if (spe_context && base <= spe_context && spe_context < backchain) | |
1402 | { | |
1403 | char annex[32]; | |
1404 | ||
1405 | /* Find gdbarch for SPU. */ | |
1406 | struct gdbarch_info info; | |
1407 | gdbarch_info_init (&info); | |
1408 | info.bfd_arch_info = bfd_lookup_arch (bfd_arch_spu, bfd_mach_spu); | |
1409 | info.byte_order = BFD_ENDIAN_BIG; | |
1410 | info.osabi = GDB_OSABI_LINUX; | |
1411 | info.tdep_info = (void *) &data.id; | |
1412 | data.gdbarch = gdbarch_find_by_info (info); | |
1413 | if (!data.gdbarch) | |
1414 | return 0; | |
1415 | ||
1416 | xsnprintf (annex, sizeof annex, "%d/regs", data.id); | |
1417 | if (target_read (¤t_target, TARGET_OBJECT_SPU, annex, | |
1418 | data.gprs, 0, sizeof data.gprs) | |
1419 | == sizeof data.gprs) | |
1420 | { | |
1421 | struct ppu2spu_cache *cache | |
1422 | = FRAME_OBSTACK_CALLOC (1, struct ppu2spu_cache); | |
1423 | ||
1424 | struct regcache *regcache = regcache_xmalloc (data.gdbarch); | |
1425 | struct cleanup *cleanups = make_cleanup_regcache_xfree (regcache); | |
1426 | regcache_save (regcache, ppu2spu_unwind_register, &data); | |
1427 | discard_cleanups (cleanups); | |
1428 | ||
1429 | cache->frame_id = frame_id_build (base, func); | |
1430 | cache->regcache = regcache; | |
1431 | *this_prologue_cache = cache; | |
1432 | return 1; | |
1433 | } | |
1434 | } | |
1435 | ||
1436 | return 0; | |
1437 | } | |
1438 | ||
1439 | static void | |
1440 | ppu2spu_dealloc_cache (struct frame_info *self, void *this_cache) | |
1441 | { | |
1442 | struct ppu2spu_cache *cache = this_cache; | |
1443 | regcache_xfree (cache->regcache); | |
1444 | } | |
1445 | ||
1446 | static const struct frame_unwind ppu2spu_unwind = { | |
1447 | ARCH_FRAME, | |
1448 | ppu2spu_this_id, | |
1449 | ppu2spu_prev_register, | |
1450 | NULL, | |
1451 | ppu2spu_sniffer, | |
1452 | ppu2spu_dealloc_cache, | |
1453 | ppu2spu_prev_arch, | |
1454 | }; | |
1455 | ||
1456 | ||
7b112f9c JT |
1457 | static void |
1458 | ppc_linux_init_abi (struct gdbarch_info info, | |
1459 | struct gdbarch *gdbarch) | |
1460 | { | |
1461 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
7284e1be | 1462 | struct tdesc_arch_data *tdesc_data = (void *) info.tdep_info; |
7b112f9c | 1463 | |
b14d30e1 JM |
1464 | /* PPC GNU/Linux uses either 64-bit or 128-bit long doubles; where |
1465 | 128-bit, they are IBM long double, not IEEE quad long double as | |
1466 | in the System V ABI PowerPC Processor Supplement. We can safely | |
1467 | let them default to 128-bit, since the debug info will give the | |
1468 | size of type actually used in each case. */ | |
1469 | set_gdbarch_long_double_bit (gdbarch, 16 * TARGET_CHAR_BIT); | |
1470 | set_gdbarch_long_double_format (gdbarch, floatformats_ibm_long_double); | |
0598a43c | 1471 | |
7284e1be UW |
1472 | /* Handle inferior calls during interrupted system calls. */ |
1473 | set_gdbarch_write_pc (gdbarch, ppc_linux_write_pc); | |
1474 | ||
a96d9b2e SDJ |
1475 | /* Get the syscall number from the arch's register. */ |
1476 | set_gdbarch_get_syscall_number (gdbarch, ppc_linux_get_syscall_number); | |
1477 | ||
7b112f9c JT |
1478 | if (tdep->wordsize == 4) |
1479 | { | |
b9ff3018 AC |
1480 | /* Until November 2001, gcc did not comply with the 32 bit SysV |
1481 | R4 ABI requirement that structures less than or equal to 8 | |
1482 | bytes should be returned in registers. Instead GCC was using | |
1483 | the the AIX/PowerOpen ABI - everything returned in memory | |
1484 | (well ignoring vectors that is). When this was corrected, it | |
1485 | wasn't fixed for GNU/Linux native platform. Use the | |
1486 | PowerOpen struct convention. */ | |
05580c65 | 1487 | set_gdbarch_return_value (gdbarch, ppc_linux_return_value); |
b9ff3018 | 1488 | |
7b112f9c JT |
1489 | set_gdbarch_memory_remove_breakpoint (gdbarch, |
1490 | ppc_linux_memory_remove_breakpoint); | |
61a65099 | 1491 | |
f470a70a | 1492 | /* Shared library handling. */ |
8526f328 | 1493 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
7b112f9c | 1494 | set_solib_svr4_fetch_link_map_offsets |
76a9d10f | 1495 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
a8f60bfc | 1496 | |
a96d9b2e SDJ |
1497 | /* Setting the correct XML syscall filename. */ |
1498 | set_xml_syscall_file_name (XML_SYSCALL_FILENAME_PPC); | |
1499 | ||
a8f60bfc AC |
1500 | /* Trampolines. */ |
1501 | tramp_frame_prepend_unwinder (gdbarch, &ppc32_linux_sigaction_tramp_frame); | |
1502 | tramp_frame_prepend_unwinder (gdbarch, &ppc32_linux_sighandler_tramp_frame); | |
a78c2d62 UW |
1503 | |
1504 | /* BFD target for core files. */ | |
1505 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_LITTLE) | |
1506 | set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpcle"); | |
1507 | else | |
1508 | set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpc"); | |
7b112f9c | 1509 | } |
f470a70a JB |
1510 | |
1511 | if (tdep->wordsize == 8) | |
1512 | { | |
00d5f93a UW |
1513 | /* Handle PPC GNU/Linux 64-bit function pointers (which are really |
1514 | function descriptors). */ | |
1515 | set_gdbarch_convert_from_func_ptr_addr | |
1516 | (gdbarch, ppc64_linux_convert_from_func_ptr_addr); | |
1517 | ||
fb318ff7 | 1518 | /* Shared library handling. */ |
2bbe3cc1 | 1519 | set_gdbarch_skip_trampoline_code (gdbarch, ppc64_skip_trampoline_code); |
fb318ff7 DJ |
1520 | set_solib_svr4_fetch_link_map_offsets |
1521 | (gdbarch, svr4_lp64_fetch_link_map_offsets); | |
1522 | ||
a96d9b2e SDJ |
1523 | /* Setting the correct XML syscall filename. */ |
1524 | set_xml_syscall_file_name (XML_SYSCALL_FILENAME_PPC64); | |
1525 | ||
a8f60bfc AC |
1526 | /* Trampolines. */ |
1527 | tramp_frame_prepend_unwinder (gdbarch, &ppc64_linux_sigaction_tramp_frame); | |
1528 | tramp_frame_prepend_unwinder (gdbarch, &ppc64_linux_sighandler_tramp_frame); | |
a78c2d62 UW |
1529 | |
1530 | /* BFD target for core files. */ | |
1531 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_LITTLE) | |
1532 | set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpcle"); | |
1533 | else | |
1534 | set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpc"); | |
f470a70a | 1535 | } |
f9be684a | 1536 | set_gdbarch_regset_from_core_section (gdbarch, ppc_linux_regset_from_core_section); |
7284e1be | 1537 | set_gdbarch_core_read_description (gdbarch, ppc_linux_core_read_description); |
b2756930 | 1538 | |
17ea7499 | 1539 | /* Supported register sections. */ |
6207416c LM |
1540 | if (tdesc_find_feature (info.target_desc, |
1541 | "org.gnu.gdb.power.vsx")) | |
1542 | set_gdbarch_core_regset_sections (gdbarch, ppc_linux_vsx_regset_sections); | |
1543 | else if (tdesc_find_feature (info.target_desc, | |
1544 | "org.gnu.gdb.power.altivec")) | |
1545 | set_gdbarch_core_regset_sections (gdbarch, ppc_linux_vmx_regset_sections); | |
1546 | else | |
1547 | set_gdbarch_core_regset_sections (gdbarch, ppc_linux_fp_regset_sections); | |
17ea7499 | 1548 | |
b2756930 KB |
1549 | /* Enable TLS support. */ |
1550 | set_gdbarch_fetch_tls_load_module_address (gdbarch, | |
1551 | svr4_fetch_objfile_link_map); | |
7284e1be UW |
1552 | |
1553 | if (tdesc_data) | |
1554 | { | |
1555 | const struct tdesc_feature *feature; | |
1556 | ||
1557 | /* If we have target-described registers, then we can safely | |
1558 | reserve a number for PPC_ORIG_R3_REGNUM and PPC_TRAP_REGNUM | |
1559 | (whether they are described or not). */ | |
1560 | gdb_assert (gdbarch_num_regs (gdbarch) <= PPC_ORIG_R3_REGNUM); | |
1561 | set_gdbarch_num_regs (gdbarch, PPC_TRAP_REGNUM + 1); | |
1562 | ||
1563 | /* If they are present, then assign them to the reserved number. */ | |
1564 | feature = tdesc_find_feature (info.target_desc, | |
1565 | "org.gnu.gdb.power.linux"); | |
1566 | if (feature != NULL) | |
1567 | { | |
1568 | tdesc_numbered_register (feature, tdesc_data, | |
1569 | PPC_ORIG_R3_REGNUM, "orig_r3"); | |
1570 | tdesc_numbered_register (feature, tdesc_data, | |
1571 | PPC_TRAP_REGNUM, "trap"); | |
1572 | } | |
1573 | } | |
85e747d2 UW |
1574 | |
1575 | /* Enable Cell/B.E. if supported by the target. */ | |
1576 | if (tdesc_compatible_p (info.target_desc, | |
1577 | bfd_lookup_arch (bfd_arch_spu, bfd_mach_spu))) | |
1578 | { | |
1579 | /* Cell/B.E. multi-architecture support. */ | |
1580 | set_spu_solib_ops (gdbarch); | |
1581 | ||
cc5f0d61 UW |
1582 | /* Cell/B.E. cross-architecture unwinder support. */ |
1583 | frame_unwind_prepend_unwinder (gdbarch, &ppu2spu_unwind); | |
1584 | ||
85e747d2 UW |
1585 | /* The default displaced_step_at_entry_point doesn't work for |
1586 | SPU stand-alone executables. */ | |
1587 | set_gdbarch_displaced_step_location (gdbarch, | |
1588 | ppc_linux_displaced_step_location); | |
1589 | } | |
7b112f9c JT |
1590 | } |
1591 | ||
63807e1d PA |
1592 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1593 | extern initialize_file_ftype _initialize_ppc_linux_tdep; | |
1594 | ||
7b112f9c JT |
1595 | void |
1596 | _initialize_ppc_linux_tdep (void) | |
1597 | { | |
0a0a4ac3 AC |
1598 | /* Register for all sub-familes of the POWER/PowerPC: 32-bit and |
1599 | 64-bit PowerPC, and the older rs6k. */ | |
1600 | gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc, GDB_OSABI_LINUX, | |
1601 | ppc_linux_init_abi); | |
1602 | gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc64, GDB_OSABI_LINUX, | |
1603 | ppc_linux_init_abi); | |
1604 | gdbarch_register_osabi (bfd_arch_rs6000, bfd_mach_rs6k, GDB_OSABI_LINUX, | |
1605 | ppc_linux_init_abi); | |
7284e1be | 1606 | |
85e747d2 UW |
1607 | /* Attach to inferior_created observer. */ |
1608 | observer_attach_inferior_created (ppc_linux_inferior_created); | |
1609 | ||
cc5f0d61 UW |
1610 | /* Attach to observers to track __spe_current_active_context. */ |
1611 | observer_attach_inferior_created (ppc_linux_spe_context_inferior_created); | |
1612 | observer_attach_solib_loaded (ppc_linux_spe_context_solib_loaded); | |
1613 | observer_attach_solib_unloaded (ppc_linux_spe_context_solib_unloaded); | |
1614 | ||
7284e1be UW |
1615 | /* Initialize the Linux target descriptions. */ |
1616 | initialize_tdesc_powerpc_32l (); | |
1617 | initialize_tdesc_powerpc_altivec32l (); | |
f4d9bade | 1618 | initialize_tdesc_powerpc_cell32l (); |
604c2f83 | 1619 | initialize_tdesc_powerpc_vsx32l (); |
69abc51c TJB |
1620 | initialize_tdesc_powerpc_isa205_32l (); |
1621 | initialize_tdesc_powerpc_isa205_altivec32l (); | |
1622 | initialize_tdesc_powerpc_isa205_vsx32l (); | |
7284e1be UW |
1623 | initialize_tdesc_powerpc_64l (); |
1624 | initialize_tdesc_powerpc_altivec64l (); | |
f4d9bade | 1625 | initialize_tdesc_powerpc_cell64l (); |
604c2f83 | 1626 | initialize_tdesc_powerpc_vsx64l (); |
69abc51c TJB |
1627 | initialize_tdesc_powerpc_isa205_64l (); |
1628 | initialize_tdesc_powerpc_isa205_altivec64l (); | |
1629 | initialize_tdesc_powerpc_isa205_vsx64l (); | |
7284e1be | 1630 | initialize_tdesc_powerpc_e500l (); |
7b112f9c | 1631 | } |