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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, |
4c38e0a4 | 4 | 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 |
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" |
a5ee0f0c | 51 | #include "linux-tdep.h" |
9aa1e687 | 52 | |
7284e1be UW |
53 | #include "features/rs6000/powerpc-32l.c" |
54 | #include "features/rs6000/powerpc-altivec32l.c" | |
f4d9bade | 55 | #include "features/rs6000/powerpc-cell32l.c" |
604c2f83 | 56 | #include "features/rs6000/powerpc-vsx32l.c" |
69abc51c TJB |
57 | #include "features/rs6000/powerpc-isa205-32l.c" |
58 | #include "features/rs6000/powerpc-isa205-altivec32l.c" | |
59 | #include "features/rs6000/powerpc-isa205-vsx32l.c" | |
7284e1be UW |
60 | #include "features/rs6000/powerpc-64l.c" |
61 | #include "features/rs6000/powerpc-altivec64l.c" | |
f4d9bade | 62 | #include "features/rs6000/powerpc-cell64l.c" |
604c2f83 | 63 | #include "features/rs6000/powerpc-vsx64l.c" |
69abc51c TJB |
64 | #include "features/rs6000/powerpc-isa205-64l.c" |
65 | #include "features/rs6000/powerpc-isa205-altivec64l.c" | |
66 | #include "features/rs6000/powerpc-isa205-vsx64l.c" | |
7284e1be UW |
67 | #include "features/rs6000/powerpc-e500l.c" |
68 | ||
a96d9b2e SDJ |
69 | /* The syscall's XML filename for PPC and PPC64. */ |
70 | #define XML_SYSCALL_FILENAME_PPC "syscalls/ppc-linux.xml" | |
71 | #define XML_SYSCALL_FILENAME_PPC64 "syscalls/ppc64-linux.xml" | |
c877c8e6 | 72 | |
122a33de KB |
73 | /* ppc_linux_memory_remove_breakpoints attempts to remove a breakpoint |
74 | in much the same fashion as memory_remove_breakpoint in mem-break.c, | |
75 | but is careful not to write back the previous contents if the code | |
76 | in question has changed in between inserting the breakpoint and | |
77 | removing it. | |
78 | ||
79 | Here is the problem that we're trying to solve... | |
80 | ||
81 | Once upon a time, before introducing this function to remove | |
82 | breakpoints from the inferior, setting a breakpoint on a shared | |
83 | library function prior to running the program would not work | |
84 | properly. In order to understand the problem, it is first | |
85 | necessary to understand a little bit about dynamic linking on | |
86 | this platform. | |
87 | ||
88 | A call to a shared library function is accomplished via a bl | |
89 | (branch-and-link) instruction whose branch target is an entry | |
90 | in the procedure linkage table (PLT). The PLT in the object | |
91 | file is uninitialized. To gdb, prior to running the program, the | |
92 | entries in the PLT are all zeros. | |
93 | ||
94 | Once the program starts running, the shared libraries are loaded | |
95 | and the procedure linkage table is initialized, but the entries in | |
96 | the table are not (necessarily) resolved. Once a function is | |
97 | actually called, the code in the PLT is hit and the function is | |
98 | resolved. In order to better illustrate this, an example is in | |
99 | order; the following example is from the gdb testsuite. | |
100 | ||
101 | We start the program shmain. | |
102 | ||
103 | [kev@arroyo testsuite]$ ../gdb gdb.base/shmain | |
104 | [...] | |
105 | ||
106 | We place two breakpoints, one on shr1 and the other on main. | |
107 | ||
108 | (gdb) b shr1 | |
109 | Breakpoint 1 at 0x100409d4 | |
110 | (gdb) b main | |
111 | Breakpoint 2 at 0x100006a0: file gdb.base/shmain.c, line 44. | |
112 | ||
113 | Examine the instruction (and the immediatly following instruction) | |
114 | upon which the breakpoint was placed. Note that the PLT entry | |
115 | for shr1 contains zeros. | |
116 | ||
117 | (gdb) x/2i 0x100409d4 | |
118 | 0x100409d4 <shr1>: .long 0x0 | |
119 | 0x100409d8 <shr1+4>: .long 0x0 | |
120 | ||
121 | Now run 'til main. | |
122 | ||
123 | (gdb) r | |
124 | Starting program: gdb.base/shmain | |
125 | Breakpoint 1 at 0xffaf790: file gdb.base/shr1.c, line 19. | |
126 | ||
127 | Breakpoint 2, main () | |
128 | at gdb.base/shmain.c:44 | |
129 | 44 g = 1; | |
130 | ||
131 | Examine the PLT again. Note that the loading of the shared | |
132 | library has initialized the PLT to code which loads a constant | |
133 | (which I think is an index into the GOT) into r11 and then | |
134 | branchs a short distance to the code which actually does the | |
135 | resolving. | |
136 | ||
137 | (gdb) x/2i 0x100409d4 | |
138 | 0x100409d4 <shr1>: li r11,4 | |
139 | 0x100409d8 <shr1+4>: b 0x10040984 <sg+4> | |
140 | (gdb) c | |
141 | Continuing. | |
142 | ||
143 | Breakpoint 1, shr1 (x=1) | |
144 | at gdb.base/shr1.c:19 | |
145 | 19 l = 1; | |
146 | ||
147 | Now we've hit the breakpoint at shr1. (The breakpoint was | |
148 | reset from the PLT entry to the actual shr1 function after the | |
149 | shared library was loaded.) Note that the PLT entry has been | |
150 | resolved to contain a branch that takes us directly to shr1. | |
151 | (The real one, not the PLT entry.) | |
152 | ||
153 | (gdb) x/2i 0x100409d4 | |
154 | 0x100409d4 <shr1>: b 0xffaf76c <shr1> | |
155 | 0x100409d8 <shr1+4>: b 0x10040984 <sg+4> | |
156 | ||
157 | The thing to note here is that the PLT entry for shr1 has been | |
158 | changed twice. | |
159 | ||
160 | Now the problem should be obvious. GDB places a breakpoint (a | |
161 | trap instruction) on the zero value of the PLT entry for shr1. | |
162 | Later on, after the shared library had been loaded and the PLT | |
163 | initialized, GDB gets a signal indicating this fact and attempts | |
164 | (as it always does when it stops) to remove all the breakpoints. | |
165 | ||
166 | The breakpoint removal was causing the former contents (a zero | |
167 | word) to be written back to the now initialized PLT entry thus | |
168 | destroying a portion of the initialization that had occurred only a | |
169 | short time ago. When execution continued, the zero word would be | |
170 | executed as an instruction an an illegal instruction trap was | |
171 | generated instead. (0 is not a legal instruction.) | |
172 | ||
173 | The fix for this problem was fairly straightforward. The function | |
174 | memory_remove_breakpoint from mem-break.c was copied to this file, | |
175 | modified slightly, and renamed to ppc_linux_memory_remove_breakpoint. | |
176 | In tm-linux.h, MEMORY_REMOVE_BREAKPOINT is defined to call this new | |
177 | function. | |
178 | ||
179 | The differences between ppc_linux_memory_remove_breakpoint () and | |
180 | memory_remove_breakpoint () are minor. All that the former does | |
181 | that the latter does not is check to make sure that the breakpoint | |
182 | location actually contains a breakpoint (trap instruction) prior | |
183 | to attempting to write back the old contents. If it does contain | |
184 | a trap instruction, we allow the old contents to be written back. | |
185 | Otherwise, we silently do nothing. | |
186 | ||
187 | The big question is whether memory_remove_breakpoint () should be | |
188 | changed to have the same functionality. The downside is that more | |
189 | traffic is generated for remote targets since we'll have an extra | |
190 | fetch of a memory word each time a breakpoint is removed. | |
191 | ||
192 | For the time being, we'll leave this self-modifying-code-friendly | |
193 | version in ppc-linux-tdep.c, but it ought to be migrated somewhere | |
194 | else in the event that some other platform has similar needs with | |
195 | regard to removing breakpoints in some potentially self modifying | |
196 | code. */ | |
63807e1d | 197 | static int |
ae4b2284 MD |
198 | ppc_linux_memory_remove_breakpoint (struct gdbarch *gdbarch, |
199 | struct bp_target_info *bp_tgt) | |
482ca3f5 | 200 | { |
8181d85f | 201 | CORE_ADDR addr = bp_tgt->placed_address; |
f4f9705a | 202 | const unsigned char *bp; |
482ca3f5 KB |
203 | int val; |
204 | int bplen; | |
50fd1280 | 205 | gdb_byte old_contents[BREAKPOINT_MAX]; |
8defab1a | 206 | struct cleanup *cleanup; |
482ca3f5 KB |
207 | |
208 | /* Determine appropriate breakpoint contents and size for this address. */ | |
ae4b2284 | 209 | bp = gdbarch_breakpoint_from_pc (gdbarch, &addr, &bplen); |
482ca3f5 | 210 | if (bp == NULL) |
8a3fe4f8 | 211 | error (_("Software breakpoints not implemented for this target.")); |
482ca3f5 | 212 | |
8defab1a DJ |
213 | /* Make sure we see the memory breakpoints. */ |
214 | cleanup = make_show_memory_breakpoints_cleanup (1); | |
482ca3f5 KB |
215 | val = target_read_memory (addr, old_contents, bplen); |
216 | ||
217 | /* If our breakpoint is no longer at the address, this means that the | |
218 | program modified the code on us, so it is wrong to put back the | |
219 | old value */ | |
220 | if (val == 0 && memcmp (bp, old_contents, bplen) == 0) | |
8181d85f | 221 | val = target_write_memory (addr, bp_tgt->shadow_contents, bplen); |
482ca3f5 | 222 | |
8defab1a | 223 | do_cleanups (cleanup); |
482ca3f5 KB |
224 | return val; |
225 | } | |
6ded7999 | 226 | |
b9ff3018 AC |
227 | /* For historic reasons, PPC 32 GNU/Linux follows PowerOpen rather |
228 | than the 32 bit SYSV R4 ABI structure return convention - all | |
229 | structures, no matter their size, are put in memory. Vectors, | |
230 | which were added later, do get returned in a register though. */ | |
231 | ||
05580c65 | 232 | static enum return_value_convention |
c055b101 CV |
233 | ppc_linux_return_value (struct gdbarch *gdbarch, struct type *func_type, |
234 | struct type *valtype, struct regcache *regcache, | |
235 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
b9ff3018 | 236 | { |
05580c65 AC |
237 | if ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT |
238 | || TYPE_CODE (valtype) == TYPE_CODE_UNION) | |
239 | && !((TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 8) | |
240 | && TYPE_VECTOR (valtype))) | |
241 | return RETURN_VALUE_STRUCT_CONVENTION; | |
242 | else | |
c055b101 CV |
243 | return ppc_sysv_abi_return_value (gdbarch, func_type, valtype, regcache, |
244 | readbuf, writebuf); | |
b9ff3018 AC |
245 | } |
246 | ||
f470a70a JB |
247 | /* Macros for matching instructions. Note that, since all the |
248 | operands are masked off before they're or-ed into the instruction, | |
249 | you can use -1 to make masks. */ | |
250 | ||
251 | #define insn_d(opcd, rts, ra, d) \ | |
252 | ((((opcd) & 0x3f) << 26) \ | |
253 | | (((rts) & 0x1f) << 21) \ | |
254 | | (((ra) & 0x1f) << 16) \ | |
255 | | ((d) & 0xffff)) | |
256 | ||
257 | #define insn_ds(opcd, rts, ra, d, xo) \ | |
258 | ((((opcd) & 0x3f) << 26) \ | |
259 | | (((rts) & 0x1f) << 21) \ | |
260 | | (((ra) & 0x1f) << 16) \ | |
261 | | ((d) & 0xfffc) \ | |
262 | | ((xo) & 0x3)) | |
263 | ||
264 | #define insn_xfx(opcd, rts, spr, xo) \ | |
265 | ((((opcd) & 0x3f) << 26) \ | |
266 | | (((rts) & 0x1f) << 21) \ | |
267 | | (((spr) & 0x1f) << 16) \ | |
268 | | (((spr) & 0x3e0) << 6) \ | |
269 | | (((xo) & 0x3ff) << 1)) | |
270 | ||
271 | /* Read a PPC instruction from memory. PPC instructions are always | |
272 | big-endian, no matter what endianness the program is running in, so | |
273 | we can't use read_memory_integer or one of its friends here. */ | |
274 | static unsigned int | |
275 | read_insn (CORE_ADDR pc) | |
276 | { | |
277 | unsigned char buf[4]; | |
278 | ||
279 | read_memory (pc, buf, 4); | |
280 | return (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3]; | |
281 | } | |
282 | ||
283 | ||
284 | /* An instruction to match. */ | |
285 | struct insn_pattern | |
286 | { | |
287 | unsigned int mask; /* mask the insn with this... */ | |
288 | unsigned int data; /* ...and see if it matches this. */ | |
289 | int optional; /* If non-zero, this insn may be absent. */ | |
290 | }; | |
291 | ||
292 | /* Return non-zero if the instructions at PC match the series | |
293 | described in PATTERN, or zero otherwise. PATTERN is an array of | |
294 | 'struct insn_pattern' objects, terminated by an entry whose mask is | |
295 | zero. | |
296 | ||
297 | When the match is successful, fill INSN[i] with what PATTERN[i] | |
298 | matched. If PATTERN[i] is optional, and the instruction wasn't | |
299 | present, set INSN[i] to 0 (which is not a valid PPC instruction). | |
300 | INSN should have as many elements as PATTERN. Note that, if | |
301 | PATTERN contains optional instructions which aren't present in | |
302 | memory, then INSN will have holes, so INSN[i] isn't necessarily the | |
303 | i'th instruction in memory. */ | |
304 | static int | |
305 | insns_match_pattern (CORE_ADDR pc, | |
306 | struct insn_pattern *pattern, | |
307 | unsigned int *insn) | |
308 | { | |
309 | int i; | |
310 | ||
311 | for (i = 0; pattern[i].mask; i++) | |
312 | { | |
313 | insn[i] = read_insn (pc); | |
314 | if ((insn[i] & pattern[i].mask) == pattern[i].data) | |
315 | pc += 4; | |
316 | else if (pattern[i].optional) | |
317 | insn[i] = 0; | |
318 | else | |
319 | return 0; | |
320 | } | |
321 | ||
322 | return 1; | |
323 | } | |
324 | ||
325 | ||
326 | /* Return the 'd' field of the d-form instruction INSN, properly | |
327 | sign-extended. */ | |
328 | static CORE_ADDR | |
329 | insn_d_field (unsigned int insn) | |
330 | { | |
331 | return ((((CORE_ADDR) insn & 0xffff) ^ 0x8000) - 0x8000); | |
332 | } | |
333 | ||
334 | ||
335 | /* Return the 'ds' field of the ds-form instruction INSN, with the two | |
336 | zero bits concatenated at the right, and properly | |
337 | sign-extended. */ | |
338 | static CORE_ADDR | |
339 | insn_ds_field (unsigned int insn) | |
340 | { | |
341 | return ((((CORE_ADDR) insn & 0xfffc) ^ 0x8000) - 0x8000); | |
342 | } | |
343 | ||
344 | ||
e538d2d7 | 345 | /* If DESC is the address of a 64-bit PowerPC GNU/Linux function |
d64558a5 JB |
346 | descriptor, return the descriptor's entry point. */ |
347 | static CORE_ADDR | |
e17a4113 | 348 | ppc64_desc_entry_point (struct gdbarch *gdbarch, CORE_ADDR desc) |
d64558a5 | 349 | { |
e17a4113 | 350 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
d64558a5 | 351 | /* The first word of the descriptor is the entry point. */ |
e17a4113 | 352 | return (CORE_ADDR) read_memory_unsigned_integer (desc, 8, byte_order); |
d64558a5 JB |
353 | } |
354 | ||
355 | ||
f470a70a JB |
356 | /* Pattern for the standard linkage function. These are built by |
357 | build_plt_stub in elf64-ppc.c, whose GLINK argument is always | |
358 | zero. */ | |
42848c96 | 359 | static struct insn_pattern ppc64_standard_linkage1[] = |
f470a70a JB |
360 | { |
361 | /* addis r12, r2, <any> */ | |
362 | { insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 }, | |
363 | ||
364 | /* std r2, 40(r1) */ | |
365 | { -1, insn_ds (62, 2, 1, 40, 0), 0 }, | |
366 | ||
367 | /* ld r11, <any>(r12) */ | |
368 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 }, | |
369 | ||
370 | /* addis r12, r12, 1 <optional> */ | |
42848c96 | 371 | { insn_d (-1, -1, -1, -1), insn_d (15, 12, 12, 1), 1 }, |
f470a70a JB |
372 | |
373 | /* ld r2, <any>(r12) */ | |
374 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 12, 0, 0), 0 }, | |
375 | ||
376 | /* addis r12, r12, 1 <optional> */ | |
42848c96 | 377 | { insn_d (-1, -1, -1, -1), insn_d (15, 12, 12, 1), 1 }, |
f470a70a JB |
378 | |
379 | /* mtctr r11 */ | |
42848c96 | 380 | { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 }, |
f470a70a JB |
381 | |
382 | /* ld r11, <any>(r12) */ | |
383 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 }, | |
384 | ||
385 | /* bctr */ | |
386 | { -1, 0x4e800420, 0 }, | |
387 | ||
388 | { 0, 0, 0 } | |
389 | }; | |
42848c96 UW |
390 | #define PPC64_STANDARD_LINKAGE1_LEN \ |
391 | (sizeof (ppc64_standard_linkage1) / sizeof (ppc64_standard_linkage1[0])) | |
392 | ||
393 | static struct insn_pattern ppc64_standard_linkage2[] = | |
394 | { | |
395 | /* addis r12, r2, <any> */ | |
396 | { insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 }, | |
397 | ||
398 | /* std r2, 40(r1) */ | |
399 | { -1, insn_ds (62, 2, 1, 40, 0), 0 }, | |
400 | ||
401 | /* ld r11, <any>(r12) */ | |
402 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 }, | |
403 | ||
404 | /* addi r12, r12, <any> <optional> */ | |
405 | { insn_d (-1, -1, -1, 0), insn_d (14, 12, 12, 0), 1 }, | |
406 | ||
407 | /* mtctr r11 */ | |
408 | { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 }, | |
409 | ||
410 | /* ld r2, <any>(r12) */ | |
411 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 12, 0, 0), 0 }, | |
412 | ||
413 | /* ld r11, <any>(r12) */ | |
414 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 }, | |
415 | ||
416 | /* bctr */ | |
417 | { -1, 0x4e800420, 0 }, | |
418 | ||
419 | { 0, 0, 0 } | |
420 | }; | |
421 | #define PPC64_STANDARD_LINKAGE2_LEN \ | |
422 | (sizeof (ppc64_standard_linkage2) / sizeof (ppc64_standard_linkage2[0])) | |
423 | ||
424 | static struct insn_pattern ppc64_standard_linkage3[] = | |
425 | { | |
426 | /* std r2, 40(r1) */ | |
427 | { -1, insn_ds (62, 2, 1, 40, 0), 0 }, | |
428 | ||
429 | /* ld r11, <any>(r2) */ | |
430 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 0 }, | |
431 | ||
432 | /* addi r2, r2, <any> <optional> */ | |
433 | { insn_d (-1, -1, -1, 0), insn_d (14, 2, 2, 0), 1 }, | |
434 | ||
435 | /* mtctr r11 */ | |
436 | { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 }, | |
437 | ||
438 | /* ld r11, <any>(r2) */ | |
439 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 0 }, | |
440 | ||
441 | /* ld r2, <any>(r2) */ | |
442 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 2, 0, 0), 0 }, | |
443 | ||
444 | /* bctr */ | |
445 | { -1, 0x4e800420, 0 }, | |
446 | ||
447 | { 0, 0, 0 } | |
448 | }; | |
449 | #define PPC64_STANDARD_LINKAGE3_LEN \ | |
450 | (sizeof (ppc64_standard_linkage3) / sizeof (ppc64_standard_linkage3[0])) | |
451 | ||
f470a70a | 452 | |
f470a70a JB |
453 | /* When the dynamic linker is doing lazy symbol resolution, the first |
454 | call to a function in another object will go like this: | |
455 | ||
456 | - The user's function calls the linkage function: | |
457 | ||
458 | 100007c4: 4b ff fc d5 bl 10000498 | |
459 | 100007c8: e8 41 00 28 ld r2,40(r1) | |
460 | ||
461 | - The linkage function loads the entry point (and other stuff) from | |
462 | the function descriptor in the PLT, and jumps to it: | |
463 | ||
464 | 10000498: 3d 82 00 00 addis r12,r2,0 | |
465 | 1000049c: f8 41 00 28 std r2,40(r1) | |
466 | 100004a0: e9 6c 80 98 ld r11,-32616(r12) | |
467 | 100004a4: e8 4c 80 a0 ld r2,-32608(r12) | |
468 | 100004a8: 7d 69 03 a6 mtctr r11 | |
469 | 100004ac: e9 6c 80 a8 ld r11,-32600(r12) | |
470 | 100004b0: 4e 80 04 20 bctr | |
471 | ||
472 | - But since this is the first time that PLT entry has been used, it | |
473 | sends control to its glink entry. That loads the number of the | |
474 | PLT entry and jumps to the common glink0 code: | |
475 | ||
476 | 10000c98: 38 00 00 00 li r0,0 | |
477 | 10000c9c: 4b ff ff dc b 10000c78 | |
478 | ||
479 | - The common glink0 code then transfers control to the dynamic | |
480 | linker's fixup code: | |
481 | ||
482 | 10000c78: e8 41 00 28 ld r2,40(r1) | |
483 | 10000c7c: 3d 82 00 00 addis r12,r2,0 | |
484 | 10000c80: e9 6c 80 80 ld r11,-32640(r12) | |
485 | 10000c84: e8 4c 80 88 ld r2,-32632(r12) | |
486 | 10000c88: 7d 69 03 a6 mtctr r11 | |
487 | 10000c8c: e9 6c 80 90 ld r11,-32624(r12) | |
488 | 10000c90: 4e 80 04 20 bctr | |
489 | ||
490 | Eventually, this code will figure out how to skip all of this, | |
491 | including the dynamic linker. At the moment, we just get through | |
492 | the linkage function. */ | |
493 | ||
494 | /* If the current thread is about to execute a series of instructions | |
495 | at PC matching the ppc64_standard_linkage pattern, and INSN is the result | |
496 | from that pattern match, return the code address to which the | |
497 | standard linkage function will send them. (This doesn't deal with | |
498 | dynamic linker lazy symbol resolution stubs.) */ | |
499 | static CORE_ADDR | |
42848c96 UW |
500 | ppc64_standard_linkage1_target (struct frame_info *frame, |
501 | CORE_ADDR pc, unsigned int *insn) | |
f470a70a | 502 | { |
e17a4113 UW |
503 | struct gdbarch *gdbarch = get_frame_arch (frame); |
504 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
f470a70a JB |
505 | |
506 | /* The address of the function descriptor this linkage function | |
507 | references. */ | |
508 | CORE_ADDR desc | |
52f729a7 UW |
509 | = ((CORE_ADDR) get_frame_register_unsigned (frame, |
510 | tdep->ppc_gp0_regnum + 2) | |
f470a70a JB |
511 | + (insn_d_field (insn[0]) << 16) |
512 | + insn_ds_field (insn[2])); | |
513 | ||
514 | /* The first word of the descriptor is the entry point. Return that. */ | |
e17a4113 | 515 | return ppc64_desc_entry_point (gdbarch, desc); |
f470a70a JB |
516 | } |
517 | ||
6207416c | 518 | static struct core_regset_section ppc_linux_vsx_regset_sections[] = |
17ea7499 | 519 | { |
2f2241f1 | 520 | { ".reg", 48 * 4, "general-purpose" }, |
1b1818e4 UW |
521 | { ".reg2", 264, "floating-point" }, |
522 | { ".reg-ppc-vmx", 544, "ppc Altivec" }, | |
523 | { ".reg-ppc-vsx", 256, "POWER7 VSX" }, | |
17ea7499 CES |
524 | { NULL, 0} |
525 | }; | |
526 | ||
6207416c LM |
527 | static struct core_regset_section ppc_linux_vmx_regset_sections[] = |
528 | { | |
2f2241f1 | 529 | { ".reg", 48 * 4, "general-purpose" }, |
1b1818e4 UW |
530 | { ".reg2", 264, "floating-point" }, |
531 | { ".reg-ppc-vmx", 544, "ppc Altivec" }, | |
6207416c LM |
532 | { NULL, 0} |
533 | }; | |
534 | ||
535 | static struct core_regset_section ppc_linux_fp_regset_sections[] = | |
536 | { | |
2f2241f1 UW |
537 | { ".reg", 48 * 4, "general-purpose" }, |
538 | { ".reg2", 264, "floating-point" }, | |
539 | { NULL, 0} | |
540 | }; | |
541 | ||
542 | static struct core_regset_section ppc64_linux_vsx_regset_sections[] = | |
543 | { | |
544 | { ".reg", 48 * 8, "general-purpose" }, | |
545 | { ".reg2", 264, "floating-point" }, | |
546 | { ".reg-ppc-vmx", 544, "ppc Altivec" }, | |
547 | { ".reg-ppc-vsx", 256, "POWER7 VSX" }, | |
548 | { NULL, 0} | |
549 | }; | |
550 | ||
551 | static struct core_regset_section ppc64_linux_vmx_regset_sections[] = | |
552 | { | |
553 | { ".reg", 48 * 8, "general-purpose" }, | |
554 | { ".reg2", 264, "floating-point" }, | |
555 | { ".reg-ppc-vmx", 544, "ppc Altivec" }, | |
556 | { NULL, 0} | |
557 | }; | |
558 | ||
559 | static struct core_regset_section ppc64_linux_fp_regset_sections[] = | |
560 | { | |
561 | { ".reg", 48 * 8, "general-purpose" }, | |
1b1818e4 | 562 | { ".reg2", 264, "floating-point" }, |
6207416c LM |
563 | { NULL, 0} |
564 | }; | |
565 | ||
42848c96 UW |
566 | static CORE_ADDR |
567 | ppc64_standard_linkage2_target (struct frame_info *frame, | |
568 | CORE_ADDR pc, unsigned int *insn) | |
569 | { | |
e17a4113 UW |
570 | struct gdbarch *gdbarch = get_frame_arch (frame); |
571 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
42848c96 UW |
572 | |
573 | /* The address of the function descriptor this linkage function | |
574 | references. */ | |
575 | CORE_ADDR desc | |
576 | = ((CORE_ADDR) get_frame_register_unsigned (frame, | |
577 | tdep->ppc_gp0_regnum + 2) | |
578 | + (insn_d_field (insn[0]) << 16) | |
579 | + insn_ds_field (insn[2])); | |
580 | ||
581 | /* The first word of the descriptor is the entry point. Return that. */ | |
e17a4113 | 582 | return ppc64_desc_entry_point (gdbarch, desc); |
42848c96 UW |
583 | } |
584 | ||
585 | static CORE_ADDR | |
586 | ppc64_standard_linkage3_target (struct frame_info *frame, | |
587 | CORE_ADDR pc, unsigned int *insn) | |
588 | { | |
e17a4113 UW |
589 | struct gdbarch *gdbarch = get_frame_arch (frame); |
590 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
42848c96 UW |
591 | |
592 | /* The address of the function descriptor this linkage function | |
593 | references. */ | |
594 | CORE_ADDR desc | |
595 | = ((CORE_ADDR) get_frame_register_unsigned (frame, | |
596 | tdep->ppc_gp0_regnum + 2) | |
597 | + insn_ds_field (insn[1])); | |
598 | ||
599 | /* The first word of the descriptor is the entry point. Return that. */ | |
e17a4113 | 600 | return ppc64_desc_entry_point (gdbarch, desc); |
42848c96 UW |
601 | } |
602 | ||
f470a70a JB |
603 | |
604 | /* Given that we've begun executing a call trampoline at PC, return | |
605 | the entry point of the function the trampoline will go to. */ | |
606 | static CORE_ADDR | |
52f729a7 | 607 | ppc64_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) |
f470a70a | 608 | { |
42848c96 UW |
609 | unsigned int ppc64_standard_linkage1_insn[PPC64_STANDARD_LINKAGE1_LEN]; |
610 | unsigned int ppc64_standard_linkage2_insn[PPC64_STANDARD_LINKAGE2_LEN]; | |
611 | unsigned int ppc64_standard_linkage3_insn[PPC64_STANDARD_LINKAGE3_LEN]; | |
612 | CORE_ADDR target; | |
613 | ||
614 | if (insns_match_pattern (pc, ppc64_standard_linkage1, | |
615 | ppc64_standard_linkage1_insn)) | |
616 | pc = ppc64_standard_linkage1_target (frame, pc, | |
617 | ppc64_standard_linkage1_insn); | |
618 | else if (insns_match_pattern (pc, ppc64_standard_linkage2, | |
619 | ppc64_standard_linkage2_insn)) | |
620 | pc = ppc64_standard_linkage2_target (frame, pc, | |
621 | ppc64_standard_linkage2_insn); | |
622 | else if (insns_match_pattern (pc, ppc64_standard_linkage3, | |
623 | ppc64_standard_linkage3_insn)) | |
624 | pc = ppc64_standard_linkage3_target (frame, pc, | |
625 | ppc64_standard_linkage3_insn); | |
f470a70a JB |
626 | else |
627 | return 0; | |
42848c96 UW |
628 | |
629 | /* The PLT descriptor will either point to the already resolved target | |
630 | address, or else to a glink stub. As the latter carry synthetic @plt | |
631 | symbols, find_solib_trampoline_target should be able to resolve them. */ | |
632 | target = find_solib_trampoline_target (frame, pc); | |
633 | return target? target : pc; | |
f470a70a JB |
634 | } |
635 | ||
636 | ||
00d5f93a | 637 | /* Support for convert_from_func_ptr_addr (ARCH, ADDR, TARG) on PPC64 |
e2d0e7eb | 638 | GNU/Linux. |
02631ec0 JB |
639 | |
640 | Usually a function pointer's representation is simply the address | |
2bbe3cc1 DJ |
641 | of the function. On GNU/Linux on the PowerPC however, a function |
642 | pointer may be a pointer to a function descriptor. | |
643 | ||
644 | For PPC64, a function descriptor is a TOC entry, in a data section, | |
645 | which contains three words: the first word is the address of the | |
646 | function, the second word is the TOC pointer (r2), and the third word | |
647 | is the static chain value. | |
648 | ||
2bbe3cc1 DJ |
649 | Throughout GDB it is currently assumed that a function pointer contains |
650 | the address of the function, which is not easy to fix. In addition, the | |
e538d2d7 JB |
651 | conversion of a function address to a function pointer would |
652 | require allocation of a TOC entry in the inferior's memory space, | |
653 | with all its drawbacks. To be able to call C++ virtual methods in | |
654 | the inferior (which are called via function pointers), | |
655 | find_function_addr uses this function to get the function address | |
2bbe3cc1 | 656 | from a function pointer. |
02631ec0 | 657 | |
2bbe3cc1 DJ |
658 | If ADDR points at what is clearly a function descriptor, transform |
659 | it into the address of the corresponding function, if needed. Be | |
660 | conservative, otherwise GDB will do the transformation on any | |
661 | random addresses such as occur when there is no symbol table. */ | |
02631ec0 JB |
662 | |
663 | static CORE_ADDR | |
00d5f93a UW |
664 | ppc64_linux_convert_from_func_ptr_addr (struct gdbarch *gdbarch, |
665 | CORE_ADDR addr, | |
666 | struct target_ops *targ) | |
02631ec0 | 667 | { |
e17a4113 | 668 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0542c86d | 669 | struct target_section *s = target_section_by_addr (targ, addr); |
02631ec0 | 670 | |
9b540880 | 671 | /* Check if ADDR points to a function descriptor. */ |
00d5f93a | 672 | if (s && strcmp (s->the_bfd_section->name, ".opd") == 0) |
e84ee240 UW |
673 | { |
674 | /* There may be relocations that need to be applied to the .opd | |
675 | section. Unfortunately, this function may be called at a time | |
676 | where these relocations have not yet been performed -- this can | |
677 | happen for example shortly after a library has been loaded with | |
678 | dlopen, but ld.so has not yet applied the relocations. | |
679 | ||
680 | To cope with both the case where the relocation has been applied, | |
681 | and the case where it has not yet been applied, we do *not* read | |
682 | the (maybe) relocated value from target memory, but we instead | |
683 | read the non-relocated value from the BFD, and apply the relocation | |
684 | offset manually. | |
685 | ||
686 | This makes the assumption that all .opd entries are always relocated | |
687 | by the same offset the section itself was relocated. This should | |
688 | always be the case for GNU/Linux executables and shared libraries. | |
689 | Note that other kind of object files (e.g. those added via | |
690 | add-symbol-files) will currently never end up here anyway, as this | |
691 | function accesses *target* sections only; only the main exec and | |
692 | shared libraries are ever added to the target. */ | |
693 | ||
694 | gdb_byte buf[8]; | |
695 | int res; | |
696 | ||
697 | res = bfd_get_section_contents (s->bfd, s->the_bfd_section, | |
698 | &buf, addr - s->addr, 8); | |
699 | if (res != 0) | |
e17a4113 | 700 | return extract_unsigned_integer (buf, 8, byte_order) |
e84ee240 UW |
701 | - bfd_section_vma (s->bfd, s->the_bfd_section) + s->addr; |
702 | } | |
9b540880 AC |
703 | |
704 | return addr; | |
02631ec0 JB |
705 | } |
706 | ||
7284e1be UW |
707 | /* Wrappers to handle Linux-only registers. */ |
708 | ||
709 | static void | |
710 | ppc_linux_supply_gregset (const struct regset *regset, | |
711 | struct regcache *regcache, | |
712 | int regnum, const void *gregs, size_t len) | |
713 | { | |
714 | const struct ppc_reg_offsets *offsets = regset->descr; | |
715 | ||
716 | ppc_supply_gregset (regset, regcache, regnum, gregs, len); | |
717 | ||
718 | if (ppc_linux_trap_reg_p (get_regcache_arch (regcache))) | |
719 | { | |
720 | /* "orig_r3" is stored 2 slots after "pc". */ | |
721 | if (regnum == -1 || regnum == PPC_ORIG_R3_REGNUM) | |
722 | ppc_supply_reg (regcache, PPC_ORIG_R3_REGNUM, gregs, | |
723 | offsets->pc_offset + 2 * offsets->gpr_size, | |
724 | offsets->gpr_size); | |
725 | ||
726 | /* "trap" is stored 8 slots after "pc". */ | |
727 | if (regnum == -1 || regnum == PPC_TRAP_REGNUM) | |
728 | ppc_supply_reg (regcache, PPC_TRAP_REGNUM, gregs, | |
729 | offsets->pc_offset + 8 * offsets->gpr_size, | |
730 | offsets->gpr_size); | |
731 | } | |
732 | } | |
f2db237a | 733 | |
f9be684a | 734 | static void |
f2db237a AM |
735 | ppc_linux_collect_gregset (const struct regset *regset, |
736 | const struct regcache *regcache, | |
737 | int regnum, void *gregs, size_t len) | |
f9be684a | 738 | { |
7284e1be UW |
739 | const struct ppc_reg_offsets *offsets = regset->descr; |
740 | ||
741 | /* Clear areas in the linux gregset not written elsewhere. */ | |
f2db237a AM |
742 | if (regnum == -1) |
743 | memset (gregs, 0, len); | |
7284e1be | 744 | |
f2db237a | 745 | ppc_collect_gregset (regset, regcache, regnum, gregs, len); |
7284e1be UW |
746 | |
747 | if (ppc_linux_trap_reg_p (get_regcache_arch (regcache))) | |
748 | { | |
749 | /* "orig_r3" is stored 2 slots after "pc". */ | |
750 | if (regnum == -1 || regnum == PPC_ORIG_R3_REGNUM) | |
751 | ppc_collect_reg (regcache, PPC_ORIG_R3_REGNUM, gregs, | |
752 | offsets->pc_offset + 2 * offsets->gpr_size, | |
753 | offsets->gpr_size); | |
754 | ||
755 | /* "trap" is stored 8 slots after "pc". */ | |
756 | if (regnum == -1 || regnum == PPC_TRAP_REGNUM) | |
757 | ppc_collect_reg (regcache, PPC_TRAP_REGNUM, gregs, | |
758 | offsets->pc_offset + 8 * offsets->gpr_size, | |
759 | offsets->gpr_size); | |
760 | } | |
f9be684a AC |
761 | } |
762 | ||
f2db237a AM |
763 | /* Regset descriptions. */ |
764 | static const struct ppc_reg_offsets ppc32_linux_reg_offsets = | |
765 | { | |
766 | /* General-purpose registers. */ | |
767 | /* .r0_offset = */ 0, | |
768 | /* .gpr_size = */ 4, | |
769 | /* .xr_size = */ 4, | |
770 | /* .pc_offset = */ 128, | |
771 | /* .ps_offset = */ 132, | |
772 | /* .cr_offset = */ 152, | |
773 | /* .lr_offset = */ 144, | |
774 | /* .ctr_offset = */ 140, | |
775 | /* .xer_offset = */ 148, | |
776 | /* .mq_offset = */ 156, | |
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 | }; |
f9be684a | 788 | |
f2db237a AM |
789 | static const struct ppc_reg_offsets ppc64_linux_reg_offsets = |
790 | { | |
791 | /* General-purpose registers. */ | |
792 | /* .r0_offset = */ 0, | |
793 | /* .gpr_size = */ 8, | |
794 | /* .xr_size = */ 8, | |
795 | /* .pc_offset = */ 256, | |
796 | /* .ps_offset = */ 264, | |
797 | /* .cr_offset = */ 304, | |
798 | /* .lr_offset = */ 288, | |
799 | /* .ctr_offset = */ 280, | |
800 | /* .xer_offset = */ 296, | |
801 | /* .mq_offset = */ 312, | |
802 | ||
803 | /* Floating-point registers. */ | |
804 | /* .f0_offset = */ 0, | |
805 | /* .fpscr_offset = */ 256, | |
806 | /* .fpscr_size = */ 8, | |
807 | ||
808 | /* AltiVec registers. */ | |
809 | /* .vr0_offset = */ 0, | |
06caf7d2 CES |
810 | /* .vscr_offset = */ 512 + 12, |
811 | /* .vrsave_offset = */ 528 | |
f2db237a | 812 | }; |
2fda4977 | 813 | |
f2db237a AM |
814 | static const struct regset ppc32_linux_gregset = { |
815 | &ppc32_linux_reg_offsets, | |
7284e1be | 816 | ppc_linux_supply_gregset, |
f2db237a AM |
817 | ppc_linux_collect_gregset, |
818 | NULL | |
f9be684a AC |
819 | }; |
820 | ||
f2db237a AM |
821 | static const struct regset ppc64_linux_gregset = { |
822 | &ppc64_linux_reg_offsets, | |
7284e1be | 823 | ppc_linux_supply_gregset, |
f2db237a AM |
824 | ppc_linux_collect_gregset, |
825 | NULL | |
826 | }; | |
f9be684a | 827 | |
f2db237a AM |
828 | static const struct regset ppc32_linux_fpregset = { |
829 | &ppc32_linux_reg_offsets, | |
830 | ppc_supply_fpregset, | |
831 | ppc_collect_fpregset, | |
832 | NULL | |
f9be684a AC |
833 | }; |
834 | ||
06caf7d2 CES |
835 | static const struct regset ppc32_linux_vrregset = { |
836 | &ppc32_linux_reg_offsets, | |
837 | ppc_supply_vrregset, | |
838 | ppc_collect_vrregset, | |
839 | NULL | |
840 | }; | |
841 | ||
604c2f83 LM |
842 | static const struct regset ppc32_linux_vsxregset = { |
843 | &ppc32_linux_reg_offsets, | |
844 | ppc_supply_vsxregset, | |
845 | ppc_collect_vsxregset, | |
846 | NULL | |
847 | }; | |
848 | ||
f2db237a AM |
849 | const struct regset * |
850 | ppc_linux_gregset (int wordsize) | |
2fda4977 | 851 | { |
f2db237a | 852 | return wordsize == 8 ? &ppc64_linux_gregset : &ppc32_linux_gregset; |
2fda4977 DJ |
853 | } |
854 | ||
f2db237a AM |
855 | const struct regset * |
856 | ppc_linux_fpregset (void) | |
857 | { | |
858 | return &ppc32_linux_fpregset; | |
859 | } | |
2fda4977 | 860 | |
f9be684a AC |
861 | static const struct regset * |
862 | ppc_linux_regset_from_core_section (struct gdbarch *core_arch, | |
863 | const char *sect_name, size_t sect_size) | |
2fda4977 | 864 | { |
f9be684a AC |
865 | struct gdbarch_tdep *tdep = gdbarch_tdep (core_arch); |
866 | if (strcmp (sect_name, ".reg") == 0) | |
2fda4977 | 867 | { |
f9be684a AC |
868 | if (tdep->wordsize == 4) |
869 | return &ppc32_linux_gregset; | |
2fda4977 | 870 | else |
f9be684a | 871 | return &ppc64_linux_gregset; |
2fda4977 | 872 | } |
f9be684a | 873 | if (strcmp (sect_name, ".reg2") == 0) |
f2db237a | 874 | return &ppc32_linux_fpregset; |
06caf7d2 CES |
875 | if (strcmp (sect_name, ".reg-ppc-vmx") == 0) |
876 | return &ppc32_linux_vrregset; | |
604c2f83 LM |
877 | if (strcmp (sect_name, ".reg-ppc-vsx") == 0) |
878 | return &ppc32_linux_vsxregset; | |
f9be684a | 879 | return NULL; |
2fda4977 DJ |
880 | } |
881 | ||
a8f60bfc | 882 | static void |
5366653e | 883 | ppc_linux_sigtramp_cache (struct frame_info *this_frame, |
a8f60bfc AC |
884 | struct trad_frame_cache *this_cache, |
885 | CORE_ADDR func, LONGEST offset, | |
886 | int bias) | |
887 | { | |
888 | CORE_ADDR base; | |
889 | CORE_ADDR regs; | |
890 | CORE_ADDR gpregs; | |
891 | CORE_ADDR fpregs; | |
892 | int i; | |
5366653e | 893 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
a8f60bfc | 894 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
e17a4113 | 895 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
a8f60bfc | 896 | |
5366653e DJ |
897 | base = get_frame_register_unsigned (this_frame, |
898 | gdbarch_sp_regnum (gdbarch)); | |
899 | if (bias > 0 && get_frame_pc (this_frame) != func) | |
a8f60bfc AC |
900 | /* See below, some signal trampolines increment the stack as their |
901 | first instruction, need to compensate for that. */ | |
902 | base -= bias; | |
903 | ||
904 | /* Find the address of the register buffer pointer. */ | |
905 | regs = base + offset; | |
906 | /* Use that to find the address of the corresponding register | |
907 | buffers. */ | |
e17a4113 | 908 | gpregs = read_memory_unsigned_integer (regs, tdep->wordsize, byte_order); |
a8f60bfc AC |
909 | fpregs = gpregs + 48 * tdep->wordsize; |
910 | ||
911 | /* General purpose. */ | |
912 | for (i = 0; i < 32; i++) | |
913 | { | |
914 | int regnum = i + tdep->ppc_gp0_regnum; | |
915 | trad_frame_set_reg_addr (this_cache, regnum, gpregs + i * tdep->wordsize); | |
916 | } | |
3e8c568d | 917 | trad_frame_set_reg_addr (this_cache, |
40a6adc1 | 918 | gdbarch_pc_regnum (gdbarch), |
3e8c568d | 919 | gpregs + 32 * tdep->wordsize); |
a8f60bfc AC |
920 | trad_frame_set_reg_addr (this_cache, tdep->ppc_ctr_regnum, |
921 | gpregs + 35 * tdep->wordsize); | |
922 | trad_frame_set_reg_addr (this_cache, tdep->ppc_lr_regnum, | |
923 | gpregs + 36 * tdep->wordsize); | |
924 | trad_frame_set_reg_addr (this_cache, tdep->ppc_xer_regnum, | |
925 | gpregs + 37 * tdep->wordsize); | |
926 | trad_frame_set_reg_addr (this_cache, tdep->ppc_cr_regnum, | |
927 | gpregs + 38 * tdep->wordsize); | |
928 | ||
7284e1be UW |
929 | if (ppc_linux_trap_reg_p (gdbarch)) |
930 | { | |
931 | trad_frame_set_reg_addr (this_cache, PPC_ORIG_R3_REGNUM, | |
932 | gpregs + 34 * tdep->wordsize); | |
933 | trad_frame_set_reg_addr (this_cache, PPC_TRAP_REGNUM, | |
934 | gpregs + 40 * tdep->wordsize); | |
935 | } | |
936 | ||
60f140f9 PG |
937 | if (ppc_floating_point_unit_p (gdbarch)) |
938 | { | |
939 | /* Floating point registers. */ | |
940 | for (i = 0; i < 32; i++) | |
941 | { | |
40a6adc1 | 942 | int regnum = i + gdbarch_fp0_regnum (gdbarch); |
60f140f9 PG |
943 | trad_frame_set_reg_addr (this_cache, regnum, |
944 | fpregs + i * tdep->wordsize); | |
945 | } | |
946 | trad_frame_set_reg_addr (this_cache, tdep->ppc_fpscr_regnum, | |
4019046a | 947 | fpregs + 32 * tdep->wordsize); |
60f140f9 | 948 | } |
a8f60bfc AC |
949 | trad_frame_set_id (this_cache, frame_id_build (base, func)); |
950 | } | |
951 | ||
952 | static void | |
953 | ppc32_linux_sigaction_cache_init (const struct tramp_frame *self, | |
5366653e | 954 | struct frame_info *this_frame, |
a8f60bfc AC |
955 | struct trad_frame_cache *this_cache, |
956 | CORE_ADDR func) | |
957 | { | |
5366653e | 958 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
a8f60bfc AC |
959 | 0xd0 /* Offset to ucontext_t. */ |
960 | + 0x30 /* Offset to .reg. */, | |
961 | 0); | |
962 | } | |
963 | ||
964 | static void | |
965 | ppc64_linux_sigaction_cache_init (const struct tramp_frame *self, | |
5366653e | 966 | struct frame_info *this_frame, |
a8f60bfc AC |
967 | struct trad_frame_cache *this_cache, |
968 | CORE_ADDR func) | |
969 | { | |
5366653e | 970 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
a8f60bfc AC |
971 | 0x80 /* Offset to ucontext_t. */ |
972 | + 0xe0 /* Offset to .reg. */, | |
973 | 128); | |
974 | } | |
975 | ||
976 | static void | |
977 | ppc32_linux_sighandler_cache_init (const struct tramp_frame *self, | |
5366653e | 978 | struct frame_info *this_frame, |
a8f60bfc AC |
979 | struct trad_frame_cache *this_cache, |
980 | CORE_ADDR func) | |
981 | { | |
5366653e | 982 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
a8f60bfc AC |
983 | 0x40 /* Offset to ucontext_t. */ |
984 | + 0x1c /* Offset to .reg. */, | |
985 | 0); | |
986 | } | |
987 | ||
988 | static void | |
989 | ppc64_linux_sighandler_cache_init (const struct tramp_frame *self, | |
5366653e | 990 | struct frame_info *this_frame, |
a8f60bfc AC |
991 | struct trad_frame_cache *this_cache, |
992 | CORE_ADDR func) | |
993 | { | |
5366653e | 994 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
a8f60bfc AC |
995 | 0x80 /* Offset to struct sigcontext. */ |
996 | + 0x38 /* Offset to .reg. */, | |
997 | 128); | |
998 | } | |
999 | ||
1000 | static struct tramp_frame ppc32_linux_sigaction_tramp_frame = { | |
1001 | SIGTRAMP_FRAME, | |
1002 | 4, | |
1003 | { | |
1004 | { 0x380000ac, -1 }, /* li r0, 172 */ | |
1005 | { 0x44000002, -1 }, /* sc */ | |
1006 | { TRAMP_SENTINEL_INSN }, | |
1007 | }, | |
1008 | ppc32_linux_sigaction_cache_init | |
1009 | }; | |
1010 | static struct tramp_frame ppc64_linux_sigaction_tramp_frame = { | |
1011 | SIGTRAMP_FRAME, | |
1012 | 4, | |
1013 | { | |
1014 | { 0x38210080, -1 }, /* addi r1,r1,128 */ | |
1015 | { 0x380000ac, -1 }, /* li r0, 172 */ | |
1016 | { 0x44000002, -1 }, /* sc */ | |
1017 | { TRAMP_SENTINEL_INSN }, | |
1018 | }, | |
1019 | ppc64_linux_sigaction_cache_init | |
1020 | }; | |
1021 | static struct tramp_frame ppc32_linux_sighandler_tramp_frame = { | |
1022 | SIGTRAMP_FRAME, | |
1023 | 4, | |
1024 | { | |
1025 | { 0x38000077, -1 }, /* li r0,119 */ | |
1026 | { 0x44000002, -1 }, /* sc */ | |
1027 | { TRAMP_SENTINEL_INSN }, | |
1028 | }, | |
1029 | ppc32_linux_sighandler_cache_init | |
1030 | }; | |
1031 | static struct tramp_frame ppc64_linux_sighandler_tramp_frame = { | |
1032 | SIGTRAMP_FRAME, | |
1033 | 4, | |
1034 | { | |
1035 | { 0x38210080, -1 }, /* addi r1,r1,128 */ | |
1036 | { 0x38000077, -1 }, /* li r0,119 */ | |
1037 | { 0x44000002, -1 }, /* sc */ | |
1038 | { TRAMP_SENTINEL_INSN }, | |
1039 | }, | |
1040 | ppc64_linux_sighandler_cache_init | |
1041 | }; | |
1042 | ||
7284e1be | 1043 | |
85e747d2 UW |
1044 | /* Address to use for displaced stepping. When debugging a stand-alone |
1045 | SPU executable, entry_point_address () will point to an SPU local-store | |
1046 | address and is thus not usable as displaced stepping location. We use | |
1047 | the auxiliary vector to determine the PowerPC-side entry point address | |
1048 | instead. */ | |
1049 | ||
1050 | static CORE_ADDR ppc_linux_entry_point_addr = 0; | |
1051 | ||
1052 | static void | |
1053 | ppc_linux_inferior_created (struct target_ops *target, int from_tty) | |
1054 | { | |
1055 | ppc_linux_entry_point_addr = 0; | |
1056 | } | |
1057 | ||
1058 | static CORE_ADDR | |
1059 | ppc_linux_displaced_step_location (struct gdbarch *gdbarch) | |
1060 | { | |
1061 | if (ppc_linux_entry_point_addr == 0) | |
1062 | { | |
1063 | CORE_ADDR addr; | |
1064 | ||
1065 | /* Determine entry point from target auxiliary vector. */ | |
1066 | if (target_auxv_search (¤t_target, AT_ENTRY, &addr) <= 0) | |
1067 | error (_("Cannot find AT_ENTRY auxiliary vector entry.")); | |
1068 | ||
1069 | /* Make certain that the address points at real code, and not a | |
1070 | function descriptor. */ | |
1071 | addr = gdbarch_convert_from_func_ptr_addr (gdbarch, addr, | |
1072 | ¤t_target); | |
1073 | ||
1074 | /* Inferior calls also use the entry point as a breakpoint location. | |
1075 | We don't want displaced stepping to interfere with those | |
1076 | breakpoints, so leave space. */ | |
1077 | ppc_linux_entry_point_addr = addr + 2 * PPC_INSN_SIZE; | |
1078 | } | |
1079 | ||
1080 | return ppc_linux_entry_point_addr; | |
1081 | } | |
1082 | ||
1083 | ||
7284e1be UW |
1084 | /* Return 1 if PPC_ORIG_R3_REGNUM and PPC_TRAP_REGNUM are usable. */ |
1085 | int | |
1086 | ppc_linux_trap_reg_p (struct gdbarch *gdbarch) | |
1087 | { | |
1088 | /* If we do not have a target description with registers, then | |
1089 | the special registers will not be included in the register set. */ | |
1090 | if (!tdesc_has_registers (gdbarch_target_desc (gdbarch))) | |
1091 | return 0; | |
1092 | ||
1093 | /* If we do, then it is safe to check the size. */ | |
1094 | return register_size (gdbarch, PPC_ORIG_R3_REGNUM) > 0 | |
1095 | && register_size (gdbarch, PPC_TRAP_REGNUM) > 0; | |
1096 | } | |
1097 | ||
a96d9b2e SDJ |
1098 | /* Return the current system call's number present in the |
1099 | r0 register. When the function fails, it returns -1. */ | |
1100 | static LONGEST | |
1101 | ppc_linux_get_syscall_number (struct gdbarch *gdbarch, | |
1102 | ptid_t ptid) | |
1103 | { | |
1104 | struct regcache *regcache = get_thread_regcache (ptid); | |
1105 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1106 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1107 | struct cleanup *cleanbuf; | |
1108 | /* The content of a register */ | |
1109 | gdb_byte *buf; | |
1110 | /* The result */ | |
1111 | LONGEST ret; | |
1112 | ||
1113 | /* Make sure we're in a 32- or 64-bit machine */ | |
1114 | gdb_assert (tdep->wordsize == 4 || tdep->wordsize == 8); | |
1115 | ||
1116 | buf = (gdb_byte *) xmalloc (tdep->wordsize * sizeof (gdb_byte)); | |
1117 | ||
1118 | cleanbuf = make_cleanup (xfree, buf); | |
1119 | ||
1120 | /* Getting the system call number from the register. | |
1121 | When dealing with PowerPC architecture, this information | |
1122 | is stored at 0th register. */ | |
1123 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum, buf); | |
1124 | ||
1125 | ret = extract_signed_integer (buf, tdep->wordsize, byte_order); | |
1126 | do_cleanups (cleanbuf); | |
1127 | ||
1128 | return ret; | |
1129 | } | |
1130 | ||
7284e1be UW |
1131 | static void |
1132 | ppc_linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
1133 | { | |
1134 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1135 | ||
1136 | regcache_cooked_write_unsigned (regcache, gdbarch_pc_regnum (gdbarch), pc); | |
1137 | ||
1138 | /* Set special TRAP register to -1 to prevent the kernel from | |
1139 | messing with the PC we just installed, if we happen to be | |
1140 | within an interrupted system call that the kernel wants to | |
1141 | restart. | |
1142 | ||
1143 | Note that after we return from the dummy call, the TRAP and | |
1144 | ORIG_R3 registers will be automatically restored, and the | |
1145 | kernel continues to restart the system call at this point. */ | |
1146 | if (ppc_linux_trap_reg_p (gdbarch)) | |
1147 | regcache_cooked_write_unsigned (regcache, PPC_TRAP_REGNUM, -1); | |
1148 | } | |
1149 | ||
f4d9bade UW |
1150 | static int |
1151 | ppc_linux_spu_section (bfd *abfd, asection *asect, void *user_data) | |
1152 | { | |
1153 | return strncmp (bfd_section_name (abfd, asect), "SPU/", 4) == 0; | |
1154 | } | |
1155 | ||
7284e1be UW |
1156 | static const struct target_desc * |
1157 | ppc_linux_core_read_description (struct gdbarch *gdbarch, | |
1158 | struct target_ops *target, | |
1159 | bfd *abfd) | |
1160 | { | |
f4d9bade | 1161 | asection *cell = bfd_sections_find_if (abfd, ppc_linux_spu_section, NULL); |
7284e1be | 1162 | asection *altivec = bfd_get_section_by_name (abfd, ".reg-ppc-vmx"); |
604c2f83 | 1163 | asection *vsx = bfd_get_section_by_name (abfd, ".reg-ppc-vsx"); |
7284e1be UW |
1164 | asection *section = bfd_get_section_by_name (abfd, ".reg"); |
1165 | if (! section) | |
1166 | return NULL; | |
1167 | ||
1168 | switch (bfd_section_size (abfd, section)) | |
1169 | { | |
1170 | case 48 * 4: | |
f4d9bade UW |
1171 | if (cell) |
1172 | return tdesc_powerpc_cell32l; | |
1173 | else if (vsx) | |
604c2f83 LM |
1174 | return tdesc_powerpc_vsx32l; |
1175 | else if (altivec) | |
1176 | return tdesc_powerpc_altivec32l; | |
1177 | else | |
1178 | return tdesc_powerpc_32l; | |
7284e1be UW |
1179 | |
1180 | case 48 * 8: | |
f4d9bade UW |
1181 | if (cell) |
1182 | return tdesc_powerpc_cell64l; | |
1183 | else if (vsx) | |
604c2f83 LM |
1184 | return tdesc_powerpc_vsx64l; |
1185 | else if (altivec) | |
1186 | return tdesc_powerpc_altivec64l; | |
1187 | else | |
1188 | return tdesc_powerpc_64l; | |
7284e1be UW |
1189 | |
1190 | default: | |
1191 | return NULL; | |
1192 | } | |
1193 | } | |
1194 | ||
cc5f0d61 UW |
1195 | |
1196 | /* Cell/B.E. active SPE context tracking support. */ | |
1197 | ||
1198 | static struct objfile *spe_context_objfile = NULL; | |
1199 | static CORE_ADDR spe_context_lm_addr = 0; | |
1200 | static CORE_ADDR spe_context_offset = 0; | |
1201 | ||
1202 | static ptid_t spe_context_cache_ptid; | |
1203 | static CORE_ADDR spe_context_cache_address; | |
1204 | ||
1205 | /* Hook into inferior_created, solib_loaded, and solib_unloaded observers | |
1206 | to track whether we've loaded a version of libspe2 (as static or dynamic | |
1207 | library) that provides the __spe_current_active_context variable. */ | |
1208 | static void | |
1209 | ppc_linux_spe_context_lookup (struct objfile *objfile) | |
1210 | { | |
1211 | struct minimal_symbol *sym; | |
1212 | ||
1213 | if (!objfile) | |
1214 | { | |
1215 | spe_context_objfile = NULL; | |
1216 | spe_context_lm_addr = 0; | |
1217 | spe_context_offset = 0; | |
1218 | spe_context_cache_ptid = minus_one_ptid; | |
1219 | spe_context_cache_address = 0; | |
1220 | return; | |
1221 | } | |
1222 | ||
1223 | sym = lookup_minimal_symbol ("__spe_current_active_context", NULL, objfile); | |
1224 | if (sym) | |
1225 | { | |
1226 | spe_context_objfile = objfile; | |
1227 | spe_context_lm_addr = svr4_fetch_objfile_link_map (objfile); | |
1228 | spe_context_offset = SYMBOL_VALUE_ADDRESS (sym); | |
1229 | spe_context_cache_ptid = minus_one_ptid; | |
1230 | spe_context_cache_address = 0; | |
1231 | return; | |
1232 | } | |
1233 | } | |
1234 | ||
1235 | static void | |
1236 | ppc_linux_spe_context_inferior_created (struct target_ops *t, int from_tty) | |
1237 | { | |
1238 | struct objfile *objfile; | |
1239 | ||
1240 | ppc_linux_spe_context_lookup (NULL); | |
1241 | ALL_OBJFILES (objfile) | |
1242 | ppc_linux_spe_context_lookup (objfile); | |
1243 | } | |
1244 | ||
1245 | static void | |
1246 | ppc_linux_spe_context_solib_loaded (struct so_list *so) | |
1247 | { | |
1248 | if (strstr (so->so_original_name, "/libspe") != NULL) | |
1249 | { | |
7e559477 | 1250 | solib_read_symbols (so, 0); |
cc5f0d61 UW |
1251 | ppc_linux_spe_context_lookup (so->objfile); |
1252 | } | |
1253 | } | |
1254 | ||
1255 | static void | |
1256 | ppc_linux_spe_context_solib_unloaded (struct so_list *so) | |
1257 | { | |
1258 | if (so->objfile == spe_context_objfile) | |
1259 | ppc_linux_spe_context_lookup (NULL); | |
1260 | } | |
1261 | ||
1262 | /* Retrieve contents of the N'th element in the current thread's | |
1263 | linked SPE context list into ID and NPC. Return the address of | |
1264 | said context element, or 0 if not found. */ | |
1265 | static CORE_ADDR | |
1266 | ppc_linux_spe_context (int wordsize, enum bfd_endian byte_order, | |
1267 | int n, int *id, unsigned int *npc) | |
1268 | { | |
1269 | CORE_ADDR spe_context = 0; | |
1270 | gdb_byte buf[16]; | |
1271 | int i; | |
1272 | ||
1273 | /* Quick exit if we have not found __spe_current_active_context. */ | |
1274 | if (!spe_context_objfile) | |
1275 | return 0; | |
1276 | ||
1277 | /* Look up cached address of thread-local variable. */ | |
1278 | if (!ptid_equal (spe_context_cache_ptid, inferior_ptid)) | |
1279 | { | |
1280 | struct target_ops *target = ¤t_target; | |
1281 | volatile struct gdb_exception ex; | |
1282 | ||
1283 | while (target && !target->to_get_thread_local_address) | |
1284 | target = find_target_beneath (target); | |
1285 | if (!target) | |
1286 | return 0; | |
1287 | ||
1288 | TRY_CATCH (ex, RETURN_MASK_ERROR) | |
1289 | { | |
1290 | /* We do not call target_translate_tls_address here, because | |
1291 | svr4_fetch_objfile_link_map may invalidate the frame chain, | |
1292 | which must not do while inside a frame sniffer. | |
1293 | ||
1294 | Instead, we have cached the lm_addr value, and use that to | |
1295 | directly call the target's to_get_thread_local_address. */ | |
1296 | spe_context_cache_address | |
1297 | = target->to_get_thread_local_address (target, inferior_ptid, | |
1298 | spe_context_lm_addr, | |
1299 | spe_context_offset); | |
1300 | spe_context_cache_ptid = inferior_ptid; | |
1301 | } | |
1302 | ||
1303 | if (ex.reason < 0) | |
1304 | return 0; | |
1305 | } | |
1306 | ||
1307 | /* Read variable value. */ | |
1308 | if (target_read_memory (spe_context_cache_address, buf, wordsize) == 0) | |
1309 | spe_context = extract_unsigned_integer (buf, wordsize, byte_order); | |
1310 | ||
1311 | /* Cyle through to N'th linked list element. */ | |
1312 | for (i = 0; i < n && spe_context; i++) | |
1313 | if (target_read_memory (spe_context + align_up (12, wordsize), | |
1314 | buf, wordsize) == 0) | |
1315 | spe_context = extract_unsigned_integer (buf, wordsize, byte_order); | |
1316 | else | |
1317 | spe_context = 0; | |
1318 | ||
1319 | /* Read current context. */ | |
1320 | if (spe_context | |
1321 | && target_read_memory (spe_context, buf, 12) != 0) | |
1322 | spe_context = 0; | |
1323 | ||
1324 | /* Extract data elements. */ | |
1325 | if (spe_context) | |
1326 | { | |
1327 | if (id) | |
1328 | *id = extract_signed_integer (buf, 4, byte_order); | |
1329 | if (npc) | |
1330 | *npc = extract_unsigned_integer (buf + 4, 4, byte_order); | |
1331 | } | |
1332 | ||
1333 | return spe_context; | |
1334 | } | |
1335 | ||
1336 | ||
1337 | /* Cell/B.E. cross-architecture unwinder support. */ | |
1338 | ||
1339 | struct ppu2spu_cache | |
1340 | { | |
1341 | struct frame_id frame_id; | |
1342 | struct regcache *regcache; | |
1343 | }; | |
1344 | ||
1345 | static struct gdbarch * | |
1346 | ppu2spu_prev_arch (struct frame_info *this_frame, void **this_cache) | |
1347 | { | |
1348 | struct ppu2spu_cache *cache = *this_cache; | |
1349 | return get_regcache_arch (cache->regcache); | |
1350 | } | |
1351 | ||
1352 | static void | |
1353 | ppu2spu_this_id (struct frame_info *this_frame, | |
1354 | void **this_cache, struct frame_id *this_id) | |
1355 | { | |
1356 | struct ppu2spu_cache *cache = *this_cache; | |
1357 | *this_id = cache->frame_id; | |
1358 | } | |
1359 | ||
1360 | static struct value * | |
1361 | ppu2spu_prev_register (struct frame_info *this_frame, | |
1362 | void **this_cache, int regnum) | |
1363 | { | |
1364 | struct ppu2spu_cache *cache = *this_cache; | |
1365 | struct gdbarch *gdbarch = get_regcache_arch (cache->regcache); | |
1366 | gdb_byte *buf; | |
1367 | ||
1368 | buf = alloca (register_size (gdbarch, regnum)); | |
1369 | regcache_cooked_read (cache->regcache, regnum, buf); | |
1370 | return frame_unwind_got_bytes (this_frame, regnum, buf); | |
1371 | } | |
1372 | ||
1373 | struct ppu2spu_data | |
1374 | { | |
1375 | struct gdbarch *gdbarch; | |
1376 | int id; | |
1377 | unsigned int npc; | |
1378 | gdb_byte gprs[128*16]; | |
1379 | }; | |
1380 | ||
1381 | static int | |
1382 | ppu2spu_unwind_register (void *src, int regnum, gdb_byte *buf) | |
1383 | { | |
1384 | struct ppu2spu_data *data = src; | |
1385 | enum bfd_endian byte_order = gdbarch_byte_order (data->gdbarch); | |
1386 | ||
1387 | if (regnum >= 0 && regnum < SPU_NUM_GPRS) | |
1388 | memcpy (buf, data->gprs + 16*regnum, 16); | |
1389 | else if (regnum == SPU_ID_REGNUM) | |
1390 | store_unsigned_integer (buf, 4, byte_order, data->id); | |
1391 | else if (regnum == SPU_PC_REGNUM) | |
1392 | store_unsigned_integer (buf, 4, byte_order, data->npc); | |
1393 | else | |
1394 | return 0; | |
1395 | ||
1396 | return 1; | |
1397 | } | |
1398 | ||
1399 | static int | |
1400 | ppu2spu_sniffer (const struct frame_unwind *self, | |
1401 | struct frame_info *this_frame, void **this_prologue_cache) | |
1402 | { | |
1403 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
1404 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1405 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1406 | struct ppu2spu_data data; | |
1407 | struct frame_info *fi; | |
1408 | CORE_ADDR base, func, backchain, spe_context; | |
1409 | gdb_byte buf[8]; | |
1410 | int n = 0; | |
1411 | ||
1412 | /* Count the number of SPU contexts already in the frame chain. */ | |
1413 | for (fi = get_next_frame (this_frame); fi; fi = get_next_frame (fi)) | |
1414 | if (get_frame_type (fi) == ARCH_FRAME | |
1415 | && gdbarch_bfd_arch_info (get_frame_arch (fi))->arch == bfd_arch_spu) | |
1416 | n++; | |
1417 | ||
1418 | base = get_frame_sp (this_frame); | |
1419 | func = get_frame_pc (this_frame); | |
1420 | if (target_read_memory (base, buf, tdep->wordsize)) | |
1421 | return 0; | |
1422 | backchain = extract_unsigned_integer (buf, tdep->wordsize, byte_order); | |
1423 | ||
1424 | spe_context = ppc_linux_spe_context (tdep->wordsize, byte_order, | |
1425 | n, &data.id, &data.npc); | |
1426 | if (spe_context && base <= spe_context && spe_context < backchain) | |
1427 | { | |
1428 | char annex[32]; | |
1429 | ||
1430 | /* Find gdbarch for SPU. */ | |
1431 | struct gdbarch_info info; | |
1432 | gdbarch_info_init (&info); | |
1433 | info.bfd_arch_info = bfd_lookup_arch (bfd_arch_spu, bfd_mach_spu); | |
1434 | info.byte_order = BFD_ENDIAN_BIG; | |
1435 | info.osabi = GDB_OSABI_LINUX; | |
1436 | info.tdep_info = (void *) &data.id; | |
1437 | data.gdbarch = gdbarch_find_by_info (info); | |
1438 | if (!data.gdbarch) | |
1439 | return 0; | |
1440 | ||
1441 | xsnprintf (annex, sizeof annex, "%d/regs", data.id); | |
1442 | if (target_read (¤t_target, TARGET_OBJECT_SPU, annex, | |
1443 | data.gprs, 0, sizeof data.gprs) | |
1444 | == sizeof data.gprs) | |
1445 | { | |
1446 | struct ppu2spu_cache *cache | |
1447 | = FRAME_OBSTACK_CALLOC (1, struct ppu2spu_cache); | |
1448 | ||
d37346f0 DJ |
1449 | struct address_space *aspace = get_frame_address_space (this_frame); |
1450 | struct regcache *regcache = regcache_xmalloc (data.gdbarch, aspace); | |
cc5f0d61 UW |
1451 | struct cleanup *cleanups = make_cleanup_regcache_xfree (regcache); |
1452 | regcache_save (regcache, ppu2spu_unwind_register, &data); | |
1453 | discard_cleanups (cleanups); | |
1454 | ||
1455 | cache->frame_id = frame_id_build (base, func); | |
1456 | cache->regcache = regcache; | |
1457 | *this_prologue_cache = cache; | |
1458 | return 1; | |
1459 | } | |
1460 | } | |
1461 | ||
1462 | return 0; | |
1463 | } | |
1464 | ||
1465 | static void | |
1466 | ppu2spu_dealloc_cache (struct frame_info *self, void *this_cache) | |
1467 | { | |
1468 | struct ppu2spu_cache *cache = this_cache; | |
1469 | regcache_xfree (cache->regcache); | |
1470 | } | |
1471 | ||
1472 | static const struct frame_unwind ppu2spu_unwind = { | |
1473 | ARCH_FRAME, | |
1474 | ppu2spu_this_id, | |
1475 | ppu2spu_prev_register, | |
1476 | NULL, | |
1477 | ppu2spu_sniffer, | |
1478 | ppu2spu_dealloc_cache, | |
1479 | ppu2spu_prev_arch, | |
1480 | }; | |
1481 | ||
1482 | ||
7b112f9c JT |
1483 | static void |
1484 | ppc_linux_init_abi (struct gdbarch_info info, | |
1485 | struct gdbarch *gdbarch) | |
1486 | { | |
1487 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
7284e1be | 1488 | struct tdesc_arch_data *tdesc_data = (void *) info.tdep_info; |
7b112f9c | 1489 | |
a5ee0f0c PA |
1490 | linux_init_abi (info, gdbarch); |
1491 | ||
b14d30e1 JM |
1492 | /* PPC GNU/Linux uses either 64-bit or 128-bit long doubles; where |
1493 | 128-bit, they are IBM long double, not IEEE quad long double as | |
1494 | in the System V ABI PowerPC Processor Supplement. We can safely | |
1495 | let them default to 128-bit, since the debug info will give the | |
1496 | size of type actually used in each case. */ | |
1497 | set_gdbarch_long_double_bit (gdbarch, 16 * TARGET_CHAR_BIT); | |
1498 | set_gdbarch_long_double_format (gdbarch, floatformats_ibm_long_double); | |
0598a43c | 1499 | |
7284e1be UW |
1500 | /* Handle inferior calls during interrupted system calls. */ |
1501 | set_gdbarch_write_pc (gdbarch, ppc_linux_write_pc); | |
1502 | ||
a96d9b2e SDJ |
1503 | /* Get the syscall number from the arch's register. */ |
1504 | set_gdbarch_get_syscall_number (gdbarch, ppc_linux_get_syscall_number); | |
1505 | ||
7b112f9c JT |
1506 | if (tdep->wordsize == 4) |
1507 | { | |
b9ff3018 AC |
1508 | /* Until November 2001, gcc did not comply with the 32 bit SysV |
1509 | R4 ABI requirement that structures less than or equal to 8 | |
1510 | bytes should be returned in registers. Instead GCC was using | |
1511 | the the AIX/PowerOpen ABI - everything returned in memory | |
1512 | (well ignoring vectors that is). When this was corrected, it | |
1513 | wasn't fixed for GNU/Linux native platform. Use the | |
1514 | PowerOpen struct convention. */ | |
05580c65 | 1515 | set_gdbarch_return_value (gdbarch, ppc_linux_return_value); |
b9ff3018 | 1516 | |
7b112f9c JT |
1517 | set_gdbarch_memory_remove_breakpoint (gdbarch, |
1518 | ppc_linux_memory_remove_breakpoint); | |
61a65099 | 1519 | |
f470a70a | 1520 | /* Shared library handling. */ |
8526f328 | 1521 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); |
7b112f9c | 1522 | set_solib_svr4_fetch_link_map_offsets |
76a9d10f | 1523 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
a8f60bfc | 1524 | |
a96d9b2e SDJ |
1525 | /* Setting the correct XML syscall filename. */ |
1526 | set_xml_syscall_file_name (XML_SYSCALL_FILENAME_PPC); | |
1527 | ||
a8f60bfc AC |
1528 | /* Trampolines. */ |
1529 | tramp_frame_prepend_unwinder (gdbarch, &ppc32_linux_sigaction_tramp_frame); | |
1530 | tramp_frame_prepend_unwinder (gdbarch, &ppc32_linux_sighandler_tramp_frame); | |
a78c2d62 UW |
1531 | |
1532 | /* BFD target for core files. */ | |
1533 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_LITTLE) | |
1534 | set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpcle"); | |
1535 | else | |
1536 | set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpc"); | |
2f2241f1 UW |
1537 | |
1538 | /* Supported register sections. */ | |
1539 | if (tdesc_find_feature (info.target_desc, | |
1540 | "org.gnu.gdb.power.vsx")) | |
1541 | set_gdbarch_core_regset_sections (gdbarch, | |
1542 | 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, | |
1546 | ppc_linux_vmx_regset_sections); | |
1547 | else | |
1548 | set_gdbarch_core_regset_sections (gdbarch, | |
1549 | ppc_linux_fp_regset_sections); | |
7b112f9c | 1550 | } |
f470a70a JB |
1551 | |
1552 | if (tdep->wordsize == 8) | |
1553 | { | |
00d5f93a UW |
1554 | /* Handle PPC GNU/Linux 64-bit function pointers (which are really |
1555 | function descriptors). */ | |
1556 | set_gdbarch_convert_from_func_ptr_addr | |
1557 | (gdbarch, ppc64_linux_convert_from_func_ptr_addr); | |
1558 | ||
fb318ff7 | 1559 | /* Shared library handling. */ |
2bbe3cc1 | 1560 | set_gdbarch_skip_trampoline_code (gdbarch, ppc64_skip_trampoline_code); |
fb318ff7 DJ |
1561 | set_solib_svr4_fetch_link_map_offsets |
1562 | (gdbarch, svr4_lp64_fetch_link_map_offsets); | |
1563 | ||
a96d9b2e SDJ |
1564 | /* Setting the correct XML syscall filename. */ |
1565 | set_xml_syscall_file_name (XML_SYSCALL_FILENAME_PPC64); | |
1566 | ||
a8f60bfc AC |
1567 | /* Trampolines. */ |
1568 | tramp_frame_prepend_unwinder (gdbarch, &ppc64_linux_sigaction_tramp_frame); | |
1569 | tramp_frame_prepend_unwinder (gdbarch, &ppc64_linux_sighandler_tramp_frame); | |
a78c2d62 UW |
1570 | |
1571 | /* BFD target for core files. */ | |
1572 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_LITTLE) | |
1573 | set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpcle"); | |
1574 | else | |
1575 | set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpc"); | |
2f2241f1 UW |
1576 | |
1577 | /* Supported register sections. */ | |
1578 | if (tdesc_find_feature (info.target_desc, | |
1579 | "org.gnu.gdb.power.vsx")) | |
1580 | set_gdbarch_core_regset_sections (gdbarch, | |
1581 | ppc64_linux_vsx_regset_sections); | |
1582 | else if (tdesc_find_feature (info.target_desc, | |
1583 | "org.gnu.gdb.power.altivec")) | |
1584 | set_gdbarch_core_regset_sections (gdbarch, | |
1585 | ppc64_linux_vmx_regset_sections); | |
1586 | else | |
1587 | set_gdbarch_core_regset_sections (gdbarch, | |
1588 | ppc64_linux_fp_regset_sections); | |
f470a70a | 1589 | } |
f9be684a | 1590 | set_gdbarch_regset_from_core_section (gdbarch, ppc_linux_regset_from_core_section); |
7284e1be | 1591 | set_gdbarch_core_read_description (gdbarch, ppc_linux_core_read_description); |
b2756930 KB |
1592 | |
1593 | /* Enable TLS support. */ | |
1594 | set_gdbarch_fetch_tls_load_module_address (gdbarch, | |
1595 | svr4_fetch_objfile_link_map); | |
7284e1be UW |
1596 | |
1597 | if (tdesc_data) | |
1598 | { | |
1599 | const struct tdesc_feature *feature; | |
1600 | ||
1601 | /* If we have target-described registers, then we can safely | |
1602 | reserve a number for PPC_ORIG_R3_REGNUM and PPC_TRAP_REGNUM | |
1603 | (whether they are described or not). */ | |
1604 | gdb_assert (gdbarch_num_regs (gdbarch) <= PPC_ORIG_R3_REGNUM); | |
1605 | set_gdbarch_num_regs (gdbarch, PPC_TRAP_REGNUM + 1); | |
1606 | ||
1607 | /* If they are present, then assign them to the reserved number. */ | |
1608 | feature = tdesc_find_feature (info.target_desc, | |
1609 | "org.gnu.gdb.power.linux"); | |
1610 | if (feature != NULL) | |
1611 | { | |
1612 | tdesc_numbered_register (feature, tdesc_data, | |
1613 | PPC_ORIG_R3_REGNUM, "orig_r3"); | |
1614 | tdesc_numbered_register (feature, tdesc_data, | |
1615 | PPC_TRAP_REGNUM, "trap"); | |
1616 | } | |
1617 | } | |
85e747d2 UW |
1618 | |
1619 | /* Enable Cell/B.E. if supported by the target. */ | |
1620 | if (tdesc_compatible_p (info.target_desc, | |
1621 | bfd_lookup_arch (bfd_arch_spu, bfd_mach_spu))) | |
1622 | { | |
1623 | /* Cell/B.E. multi-architecture support. */ | |
1624 | set_spu_solib_ops (gdbarch); | |
1625 | ||
cc5f0d61 UW |
1626 | /* Cell/B.E. cross-architecture unwinder support. */ |
1627 | frame_unwind_prepend_unwinder (gdbarch, &ppu2spu_unwind); | |
1628 | ||
85e747d2 UW |
1629 | /* The default displaced_step_at_entry_point doesn't work for |
1630 | SPU stand-alone executables. */ | |
1631 | set_gdbarch_displaced_step_location (gdbarch, | |
1632 | ppc_linux_displaced_step_location); | |
1633 | } | |
7b112f9c JT |
1634 | } |
1635 | ||
63807e1d PA |
1636 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1637 | extern initialize_file_ftype _initialize_ppc_linux_tdep; | |
1638 | ||
7b112f9c JT |
1639 | void |
1640 | _initialize_ppc_linux_tdep (void) | |
1641 | { | |
0a0a4ac3 AC |
1642 | /* Register for all sub-familes of the POWER/PowerPC: 32-bit and |
1643 | 64-bit PowerPC, and the older rs6k. */ | |
1644 | gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc, GDB_OSABI_LINUX, | |
1645 | ppc_linux_init_abi); | |
1646 | gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc64, GDB_OSABI_LINUX, | |
1647 | ppc_linux_init_abi); | |
1648 | gdbarch_register_osabi (bfd_arch_rs6000, bfd_mach_rs6k, GDB_OSABI_LINUX, | |
1649 | ppc_linux_init_abi); | |
7284e1be | 1650 | |
85e747d2 UW |
1651 | /* Attach to inferior_created observer. */ |
1652 | observer_attach_inferior_created (ppc_linux_inferior_created); | |
1653 | ||
cc5f0d61 UW |
1654 | /* Attach to observers to track __spe_current_active_context. */ |
1655 | observer_attach_inferior_created (ppc_linux_spe_context_inferior_created); | |
1656 | observer_attach_solib_loaded (ppc_linux_spe_context_solib_loaded); | |
1657 | observer_attach_solib_unloaded (ppc_linux_spe_context_solib_unloaded); | |
1658 | ||
7284e1be UW |
1659 | /* Initialize the Linux target descriptions. */ |
1660 | initialize_tdesc_powerpc_32l (); | |
1661 | initialize_tdesc_powerpc_altivec32l (); | |
f4d9bade | 1662 | initialize_tdesc_powerpc_cell32l (); |
604c2f83 | 1663 | initialize_tdesc_powerpc_vsx32l (); |
69abc51c TJB |
1664 | initialize_tdesc_powerpc_isa205_32l (); |
1665 | initialize_tdesc_powerpc_isa205_altivec32l (); | |
1666 | initialize_tdesc_powerpc_isa205_vsx32l (); | |
7284e1be UW |
1667 | initialize_tdesc_powerpc_64l (); |
1668 | initialize_tdesc_powerpc_altivec64l (); | |
f4d9bade | 1669 | initialize_tdesc_powerpc_cell64l (); |
604c2f83 | 1670 | initialize_tdesc_powerpc_vsx64l (); |
69abc51c TJB |
1671 | initialize_tdesc_powerpc_isa205_64l (); |
1672 | initialize_tdesc_powerpc_isa205_altivec64l (); | |
1673 | initialize_tdesc_powerpc_isa205_vsx64l (); | |
7284e1be | 1674 | initialize_tdesc_powerpc_e500l (); |
7b112f9c | 1675 | } |