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c877c8e6 | 1 | /* Target-dependent code for GDB, the GNU debugger. |
4e052eda | 2 | |
0b302171 JB |
3 | Copyright (C) 1986-1987, 1989, 1991-1997, 2000-2012 Free Software |
4 | Foundation, Inc. | |
c877c8e6 KB |
5 | |
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
a9762ec7 | 10 | the Free Software Foundation; either version 3 of the License, or |
c877c8e6 KB |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
c877c8e6 KB |
20 | |
21 | #include "defs.h" | |
22 | #include "frame.h" | |
23 | #include "inferior.h" | |
24 | #include "symtab.h" | |
25 | #include "target.h" | |
26 | #include "gdbcore.h" | |
27 | #include "gdbcmd.h" | |
28 | #include "symfile.h" | |
29 | #include "objfiles.h" | |
4e052eda | 30 | #include "regcache.h" |
fd0407d6 | 31 | #include "value.h" |
4be87837 | 32 | #include "osabi.h" |
f9be684a | 33 | #include "regset.h" |
6ded7999 | 34 | #include "solib-svr4.h" |
85e747d2 | 35 | #include "solib-spu.h" |
cc5f0d61 UW |
36 | #include "solib.h" |
37 | #include "solist.h" | |
9aa1e687 | 38 | #include "ppc-tdep.h" |
7284e1be | 39 | #include "ppc-linux-tdep.h" |
5d853008 | 40 | #include "glibc-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 | ||
5d853008 ME |
69 | /* Shared library operations for PowerPC-Linux. */ |
70 | static struct target_so_ops powerpc_so_ops; | |
71 | ||
a96d9b2e SDJ |
72 | /* The syscall's XML filename for PPC and PPC64. */ |
73 | #define XML_SYSCALL_FILENAME_PPC "syscalls/ppc-linux.xml" | |
74 | #define XML_SYSCALL_FILENAME_PPC64 "syscalls/ppc64-linux.xml" | |
c877c8e6 | 75 | |
122a33de KB |
76 | /* ppc_linux_memory_remove_breakpoints attempts to remove a breakpoint |
77 | in much the same fashion as memory_remove_breakpoint in mem-break.c, | |
78 | but is careful not to write back the previous contents if the code | |
79 | in question has changed in between inserting the breakpoint and | |
80 | removing it. | |
81 | ||
82 | Here is the problem that we're trying to solve... | |
83 | ||
84 | Once upon a time, before introducing this function to remove | |
85 | breakpoints from the inferior, setting a breakpoint on a shared | |
86 | library function prior to running the program would not work | |
87 | properly. In order to understand the problem, it is first | |
88 | necessary to understand a little bit about dynamic linking on | |
89 | this platform. | |
90 | ||
91 | A call to a shared library function is accomplished via a bl | |
92 | (branch-and-link) instruction whose branch target is an entry | |
93 | in the procedure linkage table (PLT). The PLT in the object | |
94 | file is uninitialized. To gdb, prior to running the program, the | |
95 | entries in the PLT are all zeros. | |
96 | ||
97 | Once the program starts running, the shared libraries are loaded | |
98 | and the procedure linkage table is initialized, but the entries in | |
99 | the table are not (necessarily) resolved. Once a function is | |
100 | actually called, the code in the PLT is hit and the function is | |
101 | resolved. In order to better illustrate this, an example is in | |
102 | order; the following example is from the gdb testsuite. | |
103 | ||
104 | We start the program shmain. | |
105 | ||
106 | [kev@arroyo testsuite]$ ../gdb gdb.base/shmain | |
107 | [...] | |
108 | ||
109 | We place two breakpoints, one on shr1 and the other on main. | |
110 | ||
111 | (gdb) b shr1 | |
112 | Breakpoint 1 at 0x100409d4 | |
113 | (gdb) b main | |
114 | Breakpoint 2 at 0x100006a0: file gdb.base/shmain.c, line 44. | |
115 | ||
116 | Examine the instruction (and the immediatly following instruction) | |
117 | upon which the breakpoint was placed. Note that the PLT entry | |
118 | for shr1 contains zeros. | |
119 | ||
120 | (gdb) x/2i 0x100409d4 | |
121 | 0x100409d4 <shr1>: .long 0x0 | |
122 | 0x100409d8 <shr1+4>: .long 0x0 | |
123 | ||
124 | Now run 'til main. | |
125 | ||
126 | (gdb) r | |
127 | Starting program: gdb.base/shmain | |
128 | Breakpoint 1 at 0xffaf790: file gdb.base/shr1.c, line 19. | |
129 | ||
130 | Breakpoint 2, main () | |
131 | at gdb.base/shmain.c:44 | |
132 | 44 g = 1; | |
133 | ||
134 | Examine the PLT again. Note that the loading of the shared | |
135 | library has initialized the PLT to code which loads a constant | |
136 | (which I think is an index into the GOT) into r11 and then | |
137 | branchs a short distance to the code which actually does the | |
138 | resolving. | |
139 | ||
140 | (gdb) x/2i 0x100409d4 | |
141 | 0x100409d4 <shr1>: li r11,4 | |
142 | 0x100409d8 <shr1+4>: b 0x10040984 <sg+4> | |
143 | (gdb) c | |
144 | Continuing. | |
145 | ||
146 | Breakpoint 1, shr1 (x=1) | |
147 | at gdb.base/shr1.c:19 | |
148 | 19 l = 1; | |
149 | ||
150 | Now we've hit the breakpoint at shr1. (The breakpoint was | |
151 | reset from the PLT entry to the actual shr1 function after the | |
152 | shared library was loaded.) Note that the PLT entry has been | |
0df8b418 | 153 | resolved to contain a branch that takes us directly to shr1. |
122a33de KB |
154 | (The real one, not the PLT entry.) |
155 | ||
156 | (gdb) x/2i 0x100409d4 | |
157 | 0x100409d4 <shr1>: b 0xffaf76c <shr1> | |
158 | 0x100409d8 <shr1+4>: b 0x10040984 <sg+4> | |
159 | ||
160 | The thing to note here is that the PLT entry for shr1 has been | |
161 | changed twice. | |
162 | ||
163 | Now the problem should be obvious. GDB places a breakpoint (a | |
0df8b418 | 164 | trap instruction) on the zero value of the PLT entry for shr1. |
122a33de KB |
165 | Later on, after the shared library had been loaded and the PLT |
166 | initialized, GDB gets a signal indicating this fact and attempts | |
167 | (as it always does when it stops) to remove all the breakpoints. | |
168 | ||
169 | The breakpoint removal was causing the former contents (a zero | |
170 | word) to be written back to the now initialized PLT entry thus | |
171 | destroying a portion of the initialization that had occurred only a | |
172 | short time ago. When execution continued, the zero word would be | |
766062f6 | 173 | executed as an instruction an illegal instruction trap was |
122a33de KB |
174 | generated instead. (0 is not a legal instruction.) |
175 | ||
176 | The fix for this problem was fairly straightforward. The function | |
177 | memory_remove_breakpoint from mem-break.c was copied to this file, | |
178 | modified slightly, and renamed to ppc_linux_memory_remove_breakpoint. | |
179 | In tm-linux.h, MEMORY_REMOVE_BREAKPOINT is defined to call this new | |
180 | function. | |
181 | ||
182 | The differences between ppc_linux_memory_remove_breakpoint () and | |
183 | memory_remove_breakpoint () are minor. All that the former does | |
184 | that the latter does not is check to make sure that the breakpoint | |
185 | location actually contains a breakpoint (trap instruction) prior | |
186 | to attempting to write back the old contents. If it does contain | |
0df8b418 | 187 | a trap instruction, we allow the old contents to be written back. |
122a33de KB |
188 | Otherwise, we silently do nothing. |
189 | ||
190 | The big question is whether memory_remove_breakpoint () should be | |
191 | changed to have the same functionality. The downside is that more | |
192 | traffic is generated for remote targets since we'll have an extra | |
193 | fetch of a memory word each time a breakpoint is removed. | |
194 | ||
195 | For the time being, we'll leave this self-modifying-code-friendly | |
196 | version in ppc-linux-tdep.c, but it ought to be migrated somewhere | |
197 | else in the event that some other platform has similar needs with | |
198 | regard to removing breakpoints in some potentially self modifying | |
199 | code. */ | |
63807e1d | 200 | static int |
ae4b2284 MD |
201 | ppc_linux_memory_remove_breakpoint (struct gdbarch *gdbarch, |
202 | struct bp_target_info *bp_tgt) | |
482ca3f5 | 203 | { |
8181d85f | 204 | CORE_ADDR addr = bp_tgt->placed_address; |
f4f9705a | 205 | const unsigned char *bp; |
482ca3f5 KB |
206 | int val; |
207 | int bplen; | |
50fd1280 | 208 | gdb_byte old_contents[BREAKPOINT_MAX]; |
8defab1a | 209 | struct cleanup *cleanup; |
482ca3f5 KB |
210 | |
211 | /* Determine appropriate breakpoint contents and size for this address. */ | |
ae4b2284 | 212 | bp = gdbarch_breakpoint_from_pc (gdbarch, &addr, &bplen); |
482ca3f5 | 213 | if (bp == NULL) |
8a3fe4f8 | 214 | error (_("Software breakpoints not implemented for this target.")); |
482ca3f5 | 215 | |
8defab1a DJ |
216 | /* Make sure we see the memory breakpoints. */ |
217 | cleanup = make_show_memory_breakpoints_cleanup (1); | |
482ca3f5 KB |
218 | val = target_read_memory (addr, old_contents, bplen); |
219 | ||
220 | /* If our breakpoint is no longer at the address, this means that the | |
221 | program modified the code on us, so it is wrong to put back the | |
0df8b418 | 222 | old value. */ |
482ca3f5 | 223 | if (val == 0 && memcmp (bp, old_contents, bplen) == 0) |
dd110abf | 224 | val = target_write_raw_memory (addr, bp_tgt->shadow_contents, bplen); |
482ca3f5 | 225 | |
8defab1a | 226 | do_cleanups (cleanup); |
482ca3f5 KB |
227 | return val; |
228 | } | |
6ded7999 | 229 | |
b9ff3018 AC |
230 | /* For historic reasons, PPC 32 GNU/Linux follows PowerOpen rather |
231 | than the 32 bit SYSV R4 ABI structure return convention - all | |
232 | structures, no matter their size, are put in memory. Vectors, | |
233 | which were added later, do get returned in a register though. */ | |
234 | ||
05580c65 | 235 | static enum return_value_convention |
c055b101 CV |
236 | ppc_linux_return_value (struct gdbarch *gdbarch, struct type *func_type, |
237 | struct type *valtype, struct regcache *regcache, | |
238 | gdb_byte *readbuf, const gdb_byte *writebuf) | |
b9ff3018 | 239 | { |
05580c65 AC |
240 | if ((TYPE_CODE (valtype) == TYPE_CODE_STRUCT |
241 | || TYPE_CODE (valtype) == TYPE_CODE_UNION) | |
242 | && !((TYPE_LENGTH (valtype) == 16 || TYPE_LENGTH (valtype) == 8) | |
243 | && TYPE_VECTOR (valtype))) | |
244 | return RETURN_VALUE_STRUCT_CONVENTION; | |
245 | else | |
c055b101 CV |
246 | return ppc_sysv_abi_return_value (gdbarch, func_type, valtype, regcache, |
247 | readbuf, writebuf); | |
b9ff3018 AC |
248 | } |
249 | ||
f470a70a JB |
250 | /* Macros for matching instructions. Note that, since all the |
251 | operands are masked off before they're or-ed into the instruction, | |
252 | you can use -1 to make masks. */ | |
253 | ||
254 | #define insn_d(opcd, rts, ra, d) \ | |
255 | ((((opcd) & 0x3f) << 26) \ | |
256 | | (((rts) & 0x1f) << 21) \ | |
257 | | (((ra) & 0x1f) << 16) \ | |
258 | | ((d) & 0xffff)) | |
259 | ||
260 | #define insn_ds(opcd, rts, ra, d, xo) \ | |
261 | ((((opcd) & 0x3f) << 26) \ | |
262 | | (((rts) & 0x1f) << 21) \ | |
263 | | (((ra) & 0x1f) << 16) \ | |
264 | | ((d) & 0xfffc) \ | |
265 | | ((xo) & 0x3)) | |
266 | ||
267 | #define insn_xfx(opcd, rts, spr, xo) \ | |
268 | ((((opcd) & 0x3f) << 26) \ | |
269 | | (((rts) & 0x1f) << 21) \ | |
270 | | (((spr) & 0x1f) << 16) \ | |
271 | | (((spr) & 0x3e0) << 6) \ | |
272 | | (((xo) & 0x3ff) << 1)) | |
273 | ||
274 | /* Read a PPC instruction from memory. PPC instructions are always | |
275 | big-endian, no matter what endianness the program is running in, so | |
276 | we can't use read_memory_integer or one of its friends here. */ | |
277 | static unsigned int | |
278 | read_insn (CORE_ADDR pc) | |
279 | { | |
280 | unsigned char buf[4]; | |
281 | ||
282 | read_memory (pc, buf, 4); | |
283 | return (buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3]; | |
284 | } | |
285 | ||
286 | ||
287 | /* An instruction to match. */ | |
288 | struct insn_pattern | |
289 | { | |
0df8b418 MS |
290 | unsigned int mask; /* mask the insn with this... */ |
291 | unsigned int data; /* ...and see if it matches this. */ | |
f470a70a JB |
292 | int optional; /* If non-zero, this insn may be absent. */ |
293 | }; | |
294 | ||
295 | /* Return non-zero if the instructions at PC match the series | |
296 | described in PATTERN, or zero otherwise. PATTERN is an array of | |
297 | 'struct insn_pattern' objects, terminated by an entry whose mask is | |
298 | zero. | |
299 | ||
300 | When the match is successful, fill INSN[i] with what PATTERN[i] | |
301 | matched. If PATTERN[i] is optional, and the instruction wasn't | |
302 | present, set INSN[i] to 0 (which is not a valid PPC instruction). | |
303 | INSN should have as many elements as PATTERN. Note that, if | |
304 | PATTERN contains optional instructions which aren't present in | |
305 | memory, then INSN will have holes, so INSN[i] isn't necessarily the | |
306 | i'th instruction in memory. */ | |
307 | static int | |
308 | insns_match_pattern (CORE_ADDR pc, | |
309 | struct insn_pattern *pattern, | |
310 | unsigned int *insn) | |
311 | { | |
312 | int i; | |
313 | ||
314 | for (i = 0; pattern[i].mask; i++) | |
315 | { | |
316 | insn[i] = read_insn (pc); | |
317 | if ((insn[i] & pattern[i].mask) == pattern[i].data) | |
318 | pc += 4; | |
319 | else if (pattern[i].optional) | |
320 | insn[i] = 0; | |
321 | else | |
322 | return 0; | |
323 | } | |
324 | ||
325 | return 1; | |
326 | } | |
327 | ||
328 | ||
329 | /* Return the 'd' field of the d-form instruction INSN, properly | |
330 | sign-extended. */ | |
331 | static CORE_ADDR | |
332 | insn_d_field (unsigned int insn) | |
333 | { | |
334 | return ((((CORE_ADDR) insn & 0xffff) ^ 0x8000) - 0x8000); | |
335 | } | |
336 | ||
337 | ||
338 | /* Return the 'ds' field of the ds-form instruction INSN, with the two | |
339 | zero bits concatenated at the right, and properly | |
340 | sign-extended. */ | |
341 | static CORE_ADDR | |
342 | insn_ds_field (unsigned int insn) | |
343 | { | |
344 | return ((((CORE_ADDR) insn & 0xfffc) ^ 0x8000) - 0x8000); | |
345 | } | |
346 | ||
347 | ||
e538d2d7 | 348 | /* If DESC is the address of a 64-bit PowerPC GNU/Linux function |
d64558a5 JB |
349 | descriptor, return the descriptor's entry point. */ |
350 | static CORE_ADDR | |
e17a4113 | 351 | ppc64_desc_entry_point (struct gdbarch *gdbarch, CORE_ADDR desc) |
d64558a5 | 352 | { |
e17a4113 | 353 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
d64558a5 | 354 | /* The first word of the descriptor is the entry point. */ |
e17a4113 | 355 | return (CORE_ADDR) read_memory_unsigned_integer (desc, 8, byte_order); |
d64558a5 JB |
356 | } |
357 | ||
358 | ||
f470a70a JB |
359 | /* Pattern for the standard linkage function. These are built by |
360 | build_plt_stub in elf64-ppc.c, whose GLINK argument is always | |
361 | zero. */ | |
42848c96 | 362 | static struct insn_pattern ppc64_standard_linkage1[] = |
f470a70a JB |
363 | { |
364 | /* addis r12, r2, <any> */ | |
365 | { insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 }, | |
366 | ||
367 | /* std r2, 40(r1) */ | |
368 | { -1, insn_ds (62, 2, 1, 40, 0), 0 }, | |
369 | ||
370 | /* ld r11, <any>(r12) */ | |
371 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 }, | |
372 | ||
373 | /* addis r12, r12, 1 <optional> */ | |
42848c96 | 374 | { insn_d (-1, -1, -1, -1), insn_d (15, 12, 12, 1), 1 }, |
f470a70a JB |
375 | |
376 | /* ld r2, <any>(r12) */ | |
377 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 12, 0, 0), 0 }, | |
378 | ||
379 | /* addis r12, r12, 1 <optional> */ | |
42848c96 | 380 | { insn_d (-1, -1, -1, -1), insn_d (15, 12, 12, 1), 1 }, |
f470a70a JB |
381 | |
382 | /* mtctr r11 */ | |
42848c96 | 383 | { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 }, |
f470a70a JB |
384 | |
385 | /* ld r11, <any>(r12) */ | |
386 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 }, | |
387 | ||
388 | /* bctr */ | |
389 | { -1, 0x4e800420, 0 }, | |
390 | ||
391 | { 0, 0, 0 } | |
392 | }; | |
42848c96 UW |
393 | #define PPC64_STANDARD_LINKAGE1_LEN \ |
394 | (sizeof (ppc64_standard_linkage1) / sizeof (ppc64_standard_linkage1[0])) | |
395 | ||
396 | static struct insn_pattern ppc64_standard_linkage2[] = | |
397 | { | |
398 | /* addis r12, r2, <any> */ | |
399 | { insn_d (-1, -1, -1, 0), insn_d (15, 12, 2, 0), 0 }, | |
400 | ||
401 | /* std r2, 40(r1) */ | |
402 | { -1, insn_ds (62, 2, 1, 40, 0), 0 }, | |
403 | ||
404 | /* ld r11, <any>(r12) */ | |
405 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 }, | |
406 | ||
407 | /* addi r12, r12, <any> <optional> */ | |
408 | { insn_d (-1, -1, -1, 0), insn_d (14, 12, 12, 0), 1 }, | |
409 | ||
410 | /* mtctr r11 */ | |
411 | { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 }, | |
412 | ||
413 | /* ld r2, <any>(r12) */ | |
414 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 12, 0, 0), 0 }, | |
415 | ||
416 | /* ld r11, <any>(r12) */ | |
417 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 12, 0, 0), 0 }, | |
418 | ||
419 | /* bctr */ | |
420 | { -1, 0x4e800420, 0 }, | |
421 | ||
422 | { 0, 0, 0 } | |
423 | }; | |
424 | #define PPC64_STANDARD_LINKAGE2_LEN \ | |
425 | (sizeof (ppc64_standard_linkage2) / sizeof (ppc64_standard_linkage2[0])) | |
426 | ||
427 | static struct insn_pattern ppc64_standard_linkage3[] = | |
428 | { | |
429 | /* std r2, 40(r1) */ | |
430 | { -1, insn_ds (62, 2, 1, 40, 0), 0 }, | |
431 | ||
432 | /* ld r11, <any>(r2) */ | |
433 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 0 }, | |
434 | ||
435 | /* addi r2, r2, <any> <optional> */ | |
436 | { insn_d (-1, -1, -1, 0), insn_d (14, 2, 2, 0), 1 }, | |
437 | ||
438 | /* mtctr r11 */ | |
439 | { insn_xfx (-1, -1, -1, -1), insn_xfx (31, 11, 9, 467), 0 }, | |
440 | ||
441 | /* ld r11, <any>(r2) */ | |
442 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 11, 2, 0, 0), 0 }, | |
443 | ||
444 | /* ld r2, <any>(r2) */ | |
445 | { insn_ds (-1, -1, -1, 0, -1), insn_ds (58, 2, 2, 0, 0), 0 }, | |
446 | ||
447 | /* bctr */ | |
448 | { -1, 0x4e800420, 0 }, | |
449 | ||
450 | { 0, 0, 0 } | |
451 | }; | |
452 | #define PPC64_STANDARD_LINKAGE3_LEN \ | |
453 | (sizeof (ppc64_standard_linkage3) / sizeof (ppc64_standard_linkage3[0])) | |
454 | ||
f470a70a | 455 | |
f470a70a JB |
456 | /* When the dynamic linker is doing lazy symbol resolution, the first |
457 | call to a function in another object will go like this: | |
458 | ||
459 | - The user's function calls the linkage function: | |
460 | ||
461 | 100007c4: 4b ff fc d5 bl 10000498 | |
462 | 100007c8: e8 41 00 28 ld r2,40(r1) | |
463 | ||
464 | - The linkage function loads the entry point (and other stuff) from | |
465 | the function descriptor in the PLT, and jumps to it: | |
466 | ||
467 | 10000498: 3d 82 00 00 addis r12,r2,0 | |
468 | 1000049c: f8 41 00 28 std r2,40(r1) | |
469 | 100004a0: e9 6c 80 98 ld r11,-32616(r12) | |
470 | 100004a4: e8 4c 80 a0 ld r2,-32608(r12) | |
471 | 100004a8: 7d 69 03 a6 mtctr r11 | |
472 | 100004ac: e9 6c 80 a8 ld r11,-32600(r12) | |
473 | 100004b0: 4e 80 04 20 bctr | |
474 | ||
475 | - But since this is the first time that PLT entry has been used, it | |
476 | sends control to its glink entry. That loads the number of the | |
477 | PLT entry and jumps to the common glink0 code: | |
478 | ||
479 | 10000c98: 38 00 00 00 li r0,0 | |
480 | 10000c9c: 4b ff ff dc b 10000c78 | |
481 | ||
482 | - The common glink0 code then transfers control to the dynamic | |
483 | linker's fixup code: | |
484 | ||
485 | 10000c78: e8 41 00 28 ld r2,40(r1) | |
486 | 10000c7c: 3d 82 00 00 addis r12,r2,0 | |
487 | 10000c80: e9 6c 80 80 ld r11,-32640(r12) | |
488 | 10000c84: e8 4c 80 88 ld r2,-32632(r12) | |
489 | 10000c88: 7d 69 03 a6 mtctr r11 | |
490 | 10000c8c: e9 6c 80 90 ld r11,-32624(r12) | |
491 | 10000c90: 4e 80 04 20 bctr | |
492 | ||
493 | Eventually, this code will figure out how to skip all of this, | |
494 | including the dynamic linker. At the moment, we just get through | |
495 | the linkage function. */ | |
496 | ||
497 | /* If the current thread is about to execute a series of instructions | |
498 | at PC matching the ppc64_standard_linkage pattern, and INSN is the result | |
499 | from that pattern match, return the code address to which the | |
500 | standard linkage function will send them. (This doesn't deal with | |
501 | dynamic linker lazy symbol resolution stubs.) */ | |
502 | static CORE_ADDR | |
42848c96 UW |
503 | ppc64_standard_linkage1_target (struct frame_info *frame, |
504 | CORE_ADDR pc, unsigned int *insn) | |
f470a70a | 505 | { |
e17a4113 UW |
506 | struct gdbarch *gdbarch = get_frame_arch (frame); |
507 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
f470a70a JB |
508 | |
509 | /* The address of the function descriptor this linkage function | |
510 | references. */ | |
511 | CORE_ADDR desc | |
52f729a7 UW |
512 | = ((CORE_ADDR) get_frame_register_unsigned (frame, |
513 | tdep->ppc_gp0_regnum + 2) | |
f470a70a JB |
514 | + (insn_d_field (insn[0]) << 16) |
515 | + insn_ds_field (insn[2])); | |
516 | ||
517 | /* The first word of the descriptor is the entry point. Return that. */ | |
e17a4113 | 518 | return ppc64_desc_entry_point (gdbarch, desc); |
f470a70a JB |
519 | } |
520 | ||
6207416c | 521 | static struct core_regset_section ppc_linux_vsx_regset_sections[] = |
17ea7499 | 522 | { |
2f2241f1 | 523 | { ".reg", 48 * 4, "general-purpose" }, |
1b1818e4 UW |
524 | { ".reg2", 264, "floating-point" }, |
525 | { ".reg-ppc-vmx", 544, "ppc Altivec" }, | |
526 | { ".reg-ppc-vsx", 256, "POWER7 VSX" }, | |
17ea7499 CES |
527 | { NULL, 0} |
528 | }; | |
529 | ||
6207416c LM |
530 | static struct core_regset_section ppc_linux_vmx_regset_sections[] = |
531 | { | |
2f2241f1 | 532 | { ".reg", 48 * 4, "general-purpose" }, |
1b1818e4 UW |
533 | { ".reg2", 264, "floating-point" }, |
534 | { ".reg-ppc-vmx", 544, "ppc Altivec" }, | |
6207416c LM |
535 | { NULL, 0} |
536 | }; | |
537 | ||
538 | static struct core_regset_section ppc_linux_fp_regset_sections[] = | |
539 | { | |
2f2241f1 UW |
540 | { ".reg", 48 * 4, "general-purpose" }, |
541 | { ".reg2", 264, "floating-point" }, | |
542 | { NULL, 0} | |
543 | }; | |
544 | ||
545 | static struct core_regset_section ppc64_linux_vsx_regset_sections[] = | |
546 | { | |
547 | { ".reg", 48 * 8, "general-purpose" }, | |
548 | { ".reg2", 264, "floating-point" }, | |
549 | { ".reg-ppc-vmx", 544, "ppc Altivec" }, | |
550 | { ".reg-ppc-vsx", 256, "POWER7 VSX" }, | |
551 | { NULL, 0} | |
552 | }; | |
553 | ||
554 | static struct core_regset_section ppc64_linux_vmx_regset_sections[] = | |
555 | { | |
556 | { ".reg", 48 * 8, "general-purpose" }, | |
557 | { ".reg2", 264, "floating-point" }, | |
558 | { ".reg-ppc-vmx", 544, "ppc Altivec" }, | |
559 | { NULL, 0} | |
560 | }; | |
561 | ||
562 | static struct core_regset_section ppc64_linux_fp_regset_sections[] = | |
563 | { | |
564 | { ".reg", 48 * 8, "general-purpose" }, | |
1b1818e4 | 565 | { ".reg2", 264, "floating-point" }, |
6207416c LM |
566 | { NULL, 0} |
567 | }; | |
568 | ||
42848c96 UW |
569 | static CORE_ADDR |
570 | ppc64_standard_linkage2_target (struct frame_info *frame, | |
571 | CORE_ADDR pc, unsigned int *insn) | |
572 | { | |
e17a4113 UW |
573 | struct gdbarch *gdbarch = get_frame_arch (frame); |
574 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
42848c96 UW |
575 | |
576 | /* The address of the function descriptor this linkage function | |
577 | references. */ | |
578 | CORE_ADDR desc | |
579 | = ((CORE_ADDR) get_frame_register_unsigned (frame, | |
580 | tdep->ppc_gp0_regnum + 2) | |
581 | + (insn_d_field (insn[0]) << 16) | |
582 | + insn_ds_field (insn[2])); | |
583 | ||
584 | /* The first word of the descriptor is the entry point. Return that. */ | |
e17a4113 | 585 | return ppc64_desc_entry_point (gdbarch, desc); |
42848c96 UW |
586 | } |
587 | ||
588 | static CORE_ADDR | |
589 | ppc64_standard_linkage3_target (struct frame_info *frame, | |
590 | CORE_ADDR pc, unsigned int *insn) | |
591 | { | |
e17a4113 UW |
592 | struct gdbarch *gdbarch = get_frame_arch (frame); |
593 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
42848c96 UW |
594 | |
595 | /* The address of the function descriptor this linkage function | |
596 | references. */ | |
597 | CORE_ADDR desc | |
598 | = ((CORE_ADDR) get_frame_register_unsigned (frame, | |
599 | tdep->ppc_gp0_regnum + 2) | |
600 | + insn_ds_field (insn[1])); | |
601 | ||
602 | /* The first word of the descriptor is the entry point. Return that. */ | |
e17a4113 | 603 | return ppc64_desc_entry_point (gdbarch, desc); |
42848c96 UW |
604 | } |
605 | ||
5d853008 ME |
606 | /* PLT stub in executable. */ |
607 | static struct insn_pattern powerpc32_plt_stub[] = | |
608 | { | |
609 | { 0xffff0000, 0x3d600000, 0 }, /* lis r11, xxxx */ | |
610 | { 0xffff0000, 0x816b0000, 0 }, /* lwz r11, xxxx(r11) */ | |
611 | { 0xffffffff, 0x7d6903a6, 0 }, /* mtctr r11 */ | |
612 | { 0xffffffff, 0x4e800420, 0 }, /* bctr */ | |
613 | { 0, 0, 0 } | |
614 | }; | |
615 | ||
616 | /* PLT stub in shared library. */ | |
617 | static struct insn_pattern powerpc32_plt_stub_so[] = | |
618 | { | |
619 | { 0xffff0000, 0x817e0000, 0 }, /* lwz r11, xxxx(r30) */ | |
620 | { 0xffffffff, 0x7d6903a6, 0 }, /* mtctr r11 */ | |
621 | { 0xffffffff, 0x4e800420, 0 }, /* bctr */ | |
622 | { 0xffffffff, 0x60000000, 0 }, /* nop */ | |
623 | { 0, 0, 0 } | |
624 | }; | |
625 | #define POWERPC32_PLT_STUB_LEN ARRAY_SIZE (powerpc32_plt_stub) | |
626 | ||
627 | /* Check if PC is in PLT stub. For non-secure PLT, stub is in .plt | |
628 | section. For secure PLT, stub is in .text and we need to check | |
629 | instruction patterns. */ | |
630 | ||
631 | static int | |
632 | powerpc_linux_in_dynsym_resolve_code (CORE_ADDR pc) | |
633 | { | |
634 | struct objfile *objfile; | |
635 | struct minimal_symbol *sym; | |
636 | ||
637 | /* Check whether PC is in the dynamic linker. This also checks | |
638 | whether it is in the .plt section, used by non-PIC executables. */ | |
639 | if (svr4_in_dynsym_resolve_code (pc)) | |
640 | return 1; | |
641 | ||
642 | /* Check if we are in the resolver. */ | |
643 | sym = lookup_minimal_symbol_by_pc (pc); | |
644 | if ((strcmp (SYMBOL_LINKAGE_NAME (sym), "__glink") == 0) | |
645 | || (strcmp (SYMBOL_LINKAGE_NAME (sym), "__glink_PLTresolve") == 0)) | |
646 | return 1; | |
647 | ||
648 | return 0; | |
649 | } | |
650 | ||
651 | /* Follow PLT stub to actual routine. */ | |
652 | ||
653 | static CORE_ADDR | |
654 | ppc_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) | |
655 | { | |
656 | int insnbuf[POWERPC32_PLT_STUB_LEN]; | |
657 | struct gdbarch *gdbarch = get_frame_arch (frame); | |
658 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
659 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
660 | CORE_ADDR target = 0; | |
661 | ||
662 | if (insns_match_pattern (pc, powerpc32_plt_stub, insnbuf)) | |
663 | { | |
664 | /* Insn pattern is | |
665 | lis r11, xxxx | |
666 | lwz r11, xxxx(r11) | |
667 | Branch target is in r11. */ | |
668 | ||
669 | target = (insn_d_field (insnbuf[0]) << 16) | insn_d_field (insnbuf[1]); | |
670 | target = read_memory_unsigned_integer (target, 4, byte_order); | |
671 | } | |
672 | ||
673 | if (insns_match_pattern (pc, powerpc32_plt_stub_so, insnbuf)) | |
674 | { | |
675 | /* Insn pattern is | |
676 | lwz r11, xxxx(r30) | |
677 | Branch target is in r11. */ | |
678 | ||
679 | target = get_frame_register_unsigned (frame, tdep->ppc_gp0_regnum + 30) | |
680 | + insn_d_field (insnbuf[0]); | |
681 | target = read_memory_unsigned_integer (target, 4, byte_order); | |
682 | } | |
683 | ||
684 | return target; | |
685 | } | |
f470a70a JB |
686 | |
687 | /* Given that we've begun executing a call trampoline at PC, return | |
688 | the entry point of the function the trampoline will go to. */ | |
689 | static CORE_ADDR | |
52f729a7 | 690 | ppc64_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc) |
f470a70a | 691 | { |
42848c96 UW |
692 | unsigned int ppc64_standard_linkage1_insn[PPC64_STANDARD_LINKAGE1_LEN]; |
693 | unsigned int ppc64_standard_linkage2_insn[PPC64_STANDARD_LINKAGE2_LEN]; | |
694 | unsigned int ppc64_standard_linkage3_insn[PPC64_STANDARD_LINKAGE3_LEN]; | |
695 | CORE_ADDR target; | |
696 | ||
697 | if (insns_match_pattern (pc, ppc64_standard_linkage1, | |
698 | ppc64_standard_linkage1_insn)) | |
699 | pc = ppc64_standard_linkage1_target (frame, pc, | |
700 | ppc64_standard_linkage1_insn); | |
701 | else if (insns_match_pattern (pc, ppc64_standard_linkage2, | |
702 | ppc64_standard_linkage2_insn)) | |
703 | pc = ppc64_standard_linkage2_target (frame, pc, | |
704 | ppc64_standard_linkage2_insn); | |
705 | else if (insns_match_pattern (pc, ppc64_standard_linkage3, | |
706 | ppc64_standard_linkage3_insn)) | |
707 | pc = ppc64_standard_linkage3_target (frame, pc, | |
708 | ppc64_standard_linkage3_insn); | |
f470a70a JB |
709 | else |
710 | return 0; | |
42848c96 UW |
711 | |
712 | /* The PLT descriptor will either point to the already resolved target | |
713 | address, or else to a glink stub. As the latter carry synthetic @plt | |
714 | symbols, find_solib_trampoline_target should be able to resolve them. */ | |
715 | target = find_solib_trampoline_target (frame, pc); | |
716 | return target? target : pc; | |
f470a70a JB |
717 | } |
718 | ||
719 | ||
00d5f93a | 720 | /* Support for convert_from_func_ptr_addr (ARCH, ADDR, TARG) on PPC64 |
e2d0e7eb | 721 | GNU/Linux. |
02631ec0 JB |
722 | |
723 | Usually a function pointer's representation is simply the address | |
2bbe3cc1 DJ |
724 | of the function. On GNU/Linux on the PowerPC however, a function |
725 | pointer may be a pointer to a function descriptor. | |
726 | ||
727 | For PPC64, a function descriptor is a TOC entry, in a data section, | |
728 | which contains three words: the first word is the address of the | |
729 | function, the second word is the TOC pointer (r2), and the third word | |
730 | is the static chain value. | |
731 | ||
2bbe3cc1 DJ |
732 | Throughout GDB it is currently assumed that a function pointer contains |
733 | the address of the function, which is not easy to fix. In addition, the | |
e538d2d7 JB |
734 | conversion of a function address to a function pointer would |
735 | require allocation of a TOC entry in the inferior's memory space, | |
736 | with all its drawbacks. To be able to call C++ virtual methods in | |
737 | the inferior (which are called via function pointers), | |
738 | find_function_addr uses this function to get the function address | |
2bbe3cc1 | 739 | from a function pointer. |
02631ec0 | 740 | |
2bbe3cc1 DJ |
741 | If ADDR points at what is clearly a function descriptor, transform |
742 | it into the address of the corresponding function, if needed. Be | |
743 | conservative, otherwise GDB will do the transformation on any | |
744 | random addresses such as occur when there is no symbol table. */ | |
02631ec0 JB |
745 | |
746 | static CORE_ADDR | |
00d5f93a UW |
747 | ppc64_linux_convert_from_func_ptr_addr (struct gdbarch *gdbarch, |
748 | CORE_ADDR addr, | |
749 | struct target_ops *targ) | |
02631ec0 | 750 | { |
e17a4113 | 751 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
0542c86d | 752 | struct target_section *s = target_section_by_addr (targ, addr); |
02631ec0 | 753 | |
9b540880 | 754 | /* Check if ADDR points to a function descriptor. */ |
00d5f93a | 755 | if (s && strcmp (s->the_bfd_section->name, ".opd") == 0) |
e84ee240 UW |
756 | { |
757 | /* There may be relocations that need to be applied to the .opd | |
758 | section. Unfortunately, this function may be called at a time | |
759 | where these relocations have not yet been performed -- this can | |
760 | happen for example shortly after a library has been loaded with | |
761 | dlopen, but ld.so has not yet applied the relocations. | |
762 | ||
763 | To cope with both the case where the relocation has been applied, | |
764 | and the case where it has not yet been applied, we do *not* read | |
765 | the (maybe) relocated value from target memory, but we instead | |
766 | read the non-relocated value from the BFD, and apply the relocation | |
767 | offset manually. | |
768 | ||
769 | This makes the assumption that all .opd entries are always relocated | |
770 | by the same offset the section itself was relocated. This should | |
771 | always be the case for GNU/Linux executables and shared libraries. | |
772 | Note that other kind of object files (e.g. those added via | |
773 | add-symbol-files) will currently never end up here anyway, as this | |
774 | function accesses *target* sections only; only the main exec and | |
775 | shared libraries are ever added to the target. */ | |
776 | ||
777 | gdb_byte buf[8]; | |
778 | int res; | |
779 | ||
780 | res = bfd_get_section_contents (s->bfd, s->the_bfd_section, | |
781 | &buf, addr - s->addr, 8); | |
782 | if (res != 0) | |
e17a4113 | 783 | return extract_unsigned_integer (buf, 8, byte_order) |
e84ee240 UW |
784 | - bfd_section_vma (s->bfd, s->the_bfd_section) + s->addr; |
785 | } | |
9b540880 AC |
786 | |
787 | return addr; | |
02631ec0 JB |
788 | } |
789 | ||
7284e1be UW |
790 | /* Wrappers to handle Linux-only registers. */ |
791 | ||
792 | static void | |
793 | ppc_linux_supply_gregset (const struct regset *regset, | |
794 | struct regcache *regcache, | |
795 | int regnum, const void *gregs, size_t len) | |
796 | { | |
797 | const struct ppc_reg_offsets *offsets = regset->descr; | |
798 | ||
799 | ppc_supply_gregset (regset, regcache, regnum, gregs, len); | |
800 | ||
801 | if (ppc_linux_trap_reg_p (get_regcache_arch (regcache))) | |
802 | { | |
803 | /* "orig_r3" is stored 2 slots after "pc". */ | |
804 | if (regnum == -1 || regnum == PPC_ORIG_R3_REGNUM) | |
805 | ppc_supply_reg (regcache, PPC_ORIG_R3_REGNUM, gregs, | |
806 | offsets->pc_offset + 2 * offsets->gpr_size, | |
807 | offsets->gpr_size); | |
808 | ||
809 | /* "trap" is stored 8 slots after "pc". */ | |
810 | if (regnum == -1 || regnum == PPC_TRAP_REGNUM) | |
811 | ppc_supply_reg (regcache, PPC_TRAP_REGNUM, gregs, | |
812 | offsets->pc_offset + 8 * offsets->gpr_size, | |
813 | offsets->gpr_size); | |
814 | } | |
815 | } | |
f2db237a | 816 | |
f9be684a | 817 | static void |
f2db237a AM |
818 | ppc_linux_collect_gregset (const struct regset *regset, |
819 | const struct regcache *regcache, | |
820 | int regnum, void *gregs, size_t len) | |
f9be684a | 821 | { |
7284e1be UW |
822 | const struct ppc_reg_offsets *offsets = regset->descr; |
823 | ||
824 | /* Clear areas in the linux gregset not written elsewhere. */ | |
f2db237a AM |
825 | if (regnum == -1) |
826 | memset (gregs, 0, len); | |
7284e1be | 827 | |
f2db237a | 828 | ppc_collect_gregset (regset, regcache, regnum, gregs, len); |
7284e1be UW |
829 | |
830 | if (ppc_linux_trap_reg_p (get_regcache_arch (regcache))) | |
831 | { | |
832 | /* "orig_r3" is stored 2 slots after "pc". */ | |
833 | if (regnum == -1 || regnum == PPC_ORIG_R3_REGNUM) | |
834 | ppc_collect_reg (regcache, PPC_ORIG_R3_REGNUM, gregs, | |
835 | offsets->pc_offset + 2 * offsets->gpr_size, | |
836 | offsets->gpr_size); | |
837 | ||
838 | /* "trap" is stored 8 slots after "pc". */ | |
839 | if (regnum == -1 || regnum == PPC_TRAP_REGNUM) | |
840 | ppc_collect_reg (regcache, PPC_TRAP_REGNUM, gregs, | |
841 | offsets->pc_offset + 8 * offsets->gpr_size, | |
842 | offsets->gpr_size); | |
843 | } | |
f9be684a AC |
844 | } |
845 | ||
f2db237a AM |
846 | /* Regset descriptions. */ |
847 | static const struct ppc_reg_offsets ppc32_linux_reg_offsets = | |
848 | { | |
849 | /* General-purpose registers. */ | |
850 | /* .r0_offset = */ 0, | |
851 | /* .gpr_size = */ 4, | |
852 | /* .xr_size = */ 4, | |
853 | /* .pc_offset = */ 128, | |
854 | /* .ps_offset = */ 132, | |
855 | /* .cr_offset = */ 152, | |
856 | /* .lr_offset = */ 144, | |
857 | /* .ctr_offset = */ 140, | |
858 | /* .xer_offset = */ 148, | |
859 | /* .mq_offset = */ 156, | |
860 | ||
861 | /* Floating-point registers. */ | |
862 | /* .f0_offset = */ 0, | |
863 | /* .fpscr_offset = */ 256, | |
864 | /* .fpscr_size = */ 8, | |
865 | ||
866 | /* AltiVec registers. */ | |
867 | /* .vr0_offset = */ 0, | |
06caf7d2 CES |
868 | /* .vscr_offset = */ 512 + 12, |
869 | /* .vrsave_offset = */ 528 | |
f2db237a | 870 | }; |
f9be684a | 871 | |
f2db237a AM |
872 | static const struct ppc_reg_offsets ppc64_linux_reg_offsets = |
873 | { | |
874 | /* General-purpose registers. */ | |
875 | /* .r0_offset = */ 0, | |
876 | /* .gpr_size = */ 8, | |
877 | /* .xr_size = */ 8, | |
878 | /* .pc_offset = */ 256, | |
879 | /* .ps_offset = */ 264, | |
880 | /* .cr_offset = */ 304, | |
881 | /* .lr_offset = */ 288, | |
882 | /* .ctr_offset = */ 280, | |
883 | /* .xer_offset = */ 296, | |
884 | /* .mq_offset = */ 312, | |
885 | ||
886 | /* Floating-point registers. */ | |
887 | /* .f0_offset = */ 0, | |
888 | /* .fpscr_offset = */ 256, | |
889 | /* .fpscr_size = */ 8, | |
890 | ||
891 | /* AltiVec registers. */ | |
892 | /* .vr0_offset = */ 0, | |
06caf7d2 CES |
893 | /* .vscr_offset = */ 512 + 12, |
894 | /* .vrsave_offset = */ 528 | |
f2db237a | 895 | }; |
2fda4977 | 896 | |
f2db237a AM |
897 | static const struct regset ppc32_linux_gregset = { |
898 | &ppc32_linux_reg_offsets, | |
7284e1be | 899 | ppc_linux_supply_gregset, |
f2db237a AM |
900 | ppc_linux_collect_gregset, |
901 | NULL | |
f9be684a AC |
902 | }; |
903 | ||
f2db237a AM |
904 | static const struct regset ppc64_linux_gregset = { |
905 | &ppc64_linux_reg_offsets, | |
7284e1be | 906 | ppc_linux_supply_gregset, |
f2db237a AM |
907 | ppc_linux_collect_gregset, |
908 | NULL | |
909 | }; | |
f9be684a | 910 | |
f2db237a AM |
911 | static const struct regset ppc32_linux_fpregset = { |
912 | &ppc32_linux_reg_offsets, | |
913 | ppc_supply_fpregset, | |
914 | ppc_collect_fpregset, | |
915 | NULL | |
f9be684a AC |
916 | }; |
917 | ||
06caf7d2 CES |
918 | static const struct regset ppc32_linux_vrregset = { |
919 | &ppc32_linux_reg_offsets, | |
920 | ppc_supply_vrregset, | |
921 | ppc_collect_vrregset, | |
922 | NULL | |
923 | }; | |
924 | ||
604c2f83 LM |
925 | static const struct regset ppc32_linux_vsxregset = { |
926 | &ppc32_linux_reg_offsets, | |
927 | ppc_supply_vsxregset, | |
928 | ppc_collect_vsxregset, | |
929 | NULL | |
930 | }; | |
931 | ||
f2db237a AM |
932 | const struct regset * |
933 | ppc_linux_gregset (int wordsize) | |
2fda4977 | 934 | { |
f2db237a | 935 | return wordsize == 8 ? &ppc64_linux_gregset : &ppc32_linux_gregset; |
2fda4977 DJ |
936 | } |
937 | ||
f2db237a AM |
938 | const struct regset * |
939 | ppc_linux_fpregset (void) | |
940 | { | |
941 | return &ppc32_linux_fpregset; | |
942 | } | |
2fda4977 | 943 | |
f9be684a AC |
944 | static const struct regset * |
945 | ppc_linux_regset_from_core_section (struct gdbarch *core_arch, | |
946 | const char *sect_name, size_t sect_size) | |
2fda4977 | 947 | { |
f9be684a AC |
948 | struct gdbarch_tdep *tdep = gdbarch_tdep (core_arch); |
949 | if (strcmp (sect_name, ".reg") == 0) | |
2fda4977 | 950 | { |
f9be684a AC |
951 | if (tdep->wordsize == 4) |
952 | return &ppc32_linux_gregset; | |
2fda4977 | 953 | else |
f9be684a | 954 | return &ppc64_linux_gregset; |
2fda4977 | 955 | } |
f9be684a | 956 | if (strcmp (sect_name, ".reg2") == 0) |
f2db237a | 957 | return &ppc32_linux_fpregset; |
06caf7d2 CES |
958 | if (strcmp (sect_name, ".reg-ppc-vmx") == 0) |
959 | return &ppc32_linux_vrregset; | |
604c2f83 LM |
960 | if (strcmp (sect_name, ".reg-ppc-vsx") == 0) |
961 | return &ppc32_linux_vsxregset; | |
f9be684a | 962 | return NULL; |
2fda4977 DJ |
963 | } |
964 | ||
a8f60bfc | 965 | static void |
5366653e | 966 | ppc_linux_sigtramp_cache (struct frame_info *this_frame, |
a8f60bfc AC |
967 | struct trad_frame_cache *this_cache, |
968 | CORE_ADDR func, LONGEST offset, | |
969 | int bias) | |
970 | { | |
971 | CORE_ADDR base; | |
972 | CORE_ADDR regs; | |
973 | CORE_ADDR gpregs; | |
974 | CORE_ADDR fpregs; | |
975 | int i; | |
5366653e | 976 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
a8f60bfc | 977 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); |
e17a4113 | 978 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
a8f60bfc | 979 | |
5366653e DJ |
980 | base = get_frame_register_unsigned (this_frame, |
981 | gdbarch_sp_regnum (gdbarch)); | |
982 | if (bias > 0 && get_frame_pc (this_frame) != func) | |
a8f60bfc AC |
983 | /* See below, some signal trampolines increment the stack as their |
984 | first instruction, need to compensate for that. */ | |
985 | base -= bias; | |
986 | ||
987 | /* Find the address of the register buffer pointer. */ | |
988 | regs = base + offset; | |
989 | /* Use that to find the address of the corresponding register | |
990 | buffers. */ | |
e17a4113 | 991 | gpregs = read_memory_unsigned_integer (regs, tdep->wordsize, byte_order); |
a8f60bfc AC |
992 | fpregs = gpregs + 48 * tdep->wordsize; |
993 | ||
994 | /* General purpose. */ | |
995 | for (i = 0; i < 32; i++) | |
996 | { | |
997 | int regnum = i + tdep->ppc_gp0_regnum; | |
0df8b418 MS |
998 | trad_frame_set_reg_addr (this_cache, |
999 | regnum, gpregs + i * tdep->wordsize); | |
a8f60bfc | 1000 | } |
3e8c568d | 1001 | trad_frame_set_reg_addr (this_cache, |
40a6adc1 | 1002 | gdbarch_pc_regnum (gdbarch), |
3e8c568d | 1003 | gpregs + 32 * tdep->wordsize); |
a8f60bfc AC |
1004 | trad_frame_set_reg_addr (this_cache, tdep->ppc_ctr_regnum, |
1005 | gpregs + 35 * tdep->wordsize); | |
1006 | trad_frame_set_reg_addr (this_cache, tdep->ppc_lr_regnum, | |
1007 | gpregs + 36 * tdep->wordsize); | |
1008 | trad_frame_set_reg_addr (this_cache, tdep->ppc_xer_regnum, | |
1009 | gpregs + 37 * tdep->wordsize); | |
1010 | trad_frame_set_reg_addr (this_cache, tdep->ppc_cr_regnum, | |
1011 | gpregs + 38 * tdep->wordsize); | |
1012 | ||
7284e1be UW |
1013 | if (ppc_linux_trap_reg_p (gdbarch)) |
1014 | { | |
1015 | trad_frame_set_reg_addr (this_cache, PPC_ORIG_R3_REGNUM, | |
1016 | gpregs + 34 * tdep->wordsize); | |
1017 | trad_frame_set_reg_addr (this_cache, PPC_TRAP_REGNUM, | |
1018 | gpregs + 40 * tdep->wordsize); | |
1019 | } | |
1020 | ||
60f140f9 PG |
1021 | if (ppc_floating_point_unit_p (gdbarch)) |
1022 | { | |
1023 | /* Floating point registers. */ | |
1024 | for (i = 0; i < 32; i++) | |
1025 | { | |
40a6adc1 | 1026 | int regnum = i + gdbarch_fp0_regnum (gdbarch); |
60f140f9 PG |
1027 | trad_frame_set_reg_addr (this_cache, regnum, |
1028 | fpregs + i * tdep->wordsize); | |
1029 | } | |
1030 | trad_frame_set_reg_addr (this_cache, tdep->ppc_fpscr_regnum, | |
4019046a | 1031 | fpregs + 32 * tdep->wordsize); |
60f140f9 | 1032 | } |
a8f60bfc AC |
1033 | trad_frame_set_id (this_cache, frame_id_build (base, func)); |
1034 | } | |
1035 | ||
1036 | static void | |
1037 | ppc32_linux_sigaction_cache_init (const struct tramp_frame *self, | |
5366653e | 1038 | struct frame_info *this_frame, |
a8f60bfc AC |
1039 | struct trad_frame_cache *this_cache, |
1040 | CORE_ADDR func) | |
1041 | { | |
5366653e | 1042 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
a8f60bfc AC |
1043 | 0xd0 /* Offset to ucontext_t. */ |
1044 | + 0x30 /* Offset to .reg. */, | |
1045 | 0); | |
1046 | } | |
1047 | ||
1048 | static void | |
1049 | ppc64_linux_sigaction_cache_init (const struct tramp_frame *self, | |
5366653e | 1050 | struct frame_info *this_frame, |
a8f60bfc AC |
1051 | struct trad_frame_cache *this_cache, |
1052 | CORE_ADDR func) | |
1053 | { | |
5366653e | 1054 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
a8f60bfc AC |
1055 | 0x80 /* Offset to ucontext_t. */ |
1056 | + 0xe0 /* Offset to .reg. */, | |
1057 | 128); | |
1058 | } | |
1059 | ||
1060 | static void | |
1061 | ppc32_linux_sighandler_cache_init (const struct tramp_frame *self, | |
5366653e | 1062 | struct frame_info *this_frame, |
a8f60bfc AC |
1063 | struct trad_frame_cache *this_cache, |
1064 | CORE_ADDR func) | |
1065 | { | |
5366653e | 1066 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
a8f60bfc AC |
1067 | 0x40 /* Offset to ucontext_t. */ |
1068 | + 0x1c /* Offset to .reg. */, | |
1069 | 0); | |
1070 | } | |
1071 | ||
1072 | static void | |
1073 | ppc64_linux_sighandler_cache_init (const struct tramp_frame *self, | |
5366653e | 1074 | struct frame_info *this_frame, |
a8f60bfc AC |
1075 | struct trad_frame_cache *this_cache, |
1076 | CORE_ADDR func) | |
1077 | { | |
5366653e | 1078 | ppc_linux_sigtramp_cache (this_frame, this_cache, func, |
a8f60bfc AC |
1079 | 0x80 /* Offset to struct sigcontext. */ |
1080 | + 0x38 /* Offset to .reg. */, | |
1081 | 128); | |
1082 | } | |
1083 | ||
1084 | static struct tramp_frame ppc32_linux_sigaction_tramp_frame = { | |
1085 | SIGTRAMP_FRAME, | |
1086 | 4, | |
1087 | { | |
1088 | { 0x380000ac, -1 }, /* li r0, 172 */ | |
1089 | { 0x44000002, -1 }, /* sc */ | |
1090 | { TRAMP_SENTINEL_INSN }, | |
1091 | }, | |
1092 | ppc32_linux_sigaction_cache_init | |
1093 | }; | |
1094 | static struct tramp_frame ppc64_linux_sigaction_tramp_frame = { | |
1095 | SIGTRAMP_FRAME, | |
1096 | 4, | |
1097 | { | |
1098 | { 0x38210080, -1 }, /* addi r1,r1,128 */ | |
1099 | { 0x380000ac, -1 }, /* li r0, 172 */ | |
1100 | { 0x44000002, -1 }, /* sc */ | |
1101 | { TRAMP_SENTINEL_INSN }, | |
1102 | }, | |
1103 | ppc64_linux_sigaction_cache_init | |
1104 | }; | |
1105 | static struct tramp_frame ppc32_linux_sighandler_tramp_frame = { | |
1106 | SIGTRAMP_FRAME, | |
1107 | 4, | |
1108 | { | |
1109 | { 0x38000077, -1 }, /* li r0,119 */ | |
1110 | { 0x44000002, -1 }, /* sc */ | |
1111 | { TRAMP_SENTINEL_INSN }, | |
1112 | }, | |
1113 | ppc32_linux_sighandler_cache_init | |
1114 | }; | |
1115 | static struct tramp_frame ppc64_linux_sighandler_tramp_frame = { | |
1116 | SIGTRAMP_FRAME, | |
1117 | 4, | |
1118 | { | |
1119 | { 0x38210080, -1 }, /* addi r1,r1,128 */ | |
1120 | { 0x38000077, -1 }, /* li r0,119 */ | |
1121 | { 0x44000002, -1 }, /* sc */ | |
1122 | { TRAMP_SENTINEL_INSN }, | |
1123 | }, | |
1124 | ppc64_linux_sighandler_cache_init | |
1125 | }; | |
1126 | ||
7284e1be | 1127 | |
85e747d2 UW |
1128 | /* Address to use for displaced stepping. When debugging a stand-alone |
1129 | SPU executable, entry_point_address () will point to an SPU local-store | |
1130 | address and is thus not usable as displaced stepping location. We use | |
1131 | the auxiliary vector to determine the PowerPC-side entry point address | |
1132 | instead. */ | |
1133 | ||
1134 | static CORE_ADDR ppc_linux_entry_point_addr = 0; | |
1135 | ||
1136 | static void | |
1137 | ppc_linux_inferior_created (struct target_ops *target, int from_tty) | |
1138 | { | |
1139 | ppc_linux_entry_point_addr = 0; | |
1140 | } | |
1141 | ||
1142 | static CORE_ADDR | |
1143 | ppc_linux_displaced_step_location (struct gdbarch *gdbarch) | |
1144 | { | |
1145 | if (ppc_linux_entry_point_addr == 0) | |
1146 | { | |
1147 | CORE_ADDR addr; | |
1148 | ||
1149 | /* Determine entry point from target auxiliary vector. */ | |
1150 | if (target_auxv_search (¤t_target, AT_ENTRY, &addr) <= 0) | |
1151 | error (_("Cannot find AT_ENTRY auxiliary vector entry.")); | |
1152 | ||
1153 | /* Make certain that the address points at real code, and not a | |
1154 | function descriptor. */ | |
1155 | addr = gdbarch_convert_from_func_ptr_addr (gdbarch, addr, | |
1156 | ¤t_target); | |
1157 | ||
1158 | /* Inferior calls also use the entry point as a breakpoint location. | |
1159 | We don't want displaced stepping to interfere with those | |
1160 | breakpoints, so leave space. */ | |
5931a2fa | 1161 | ppc_linux_entry_point_addr = addr + 2 * PPC_INSN_SIZE; |
85e747d2 UW |
1162 | } |
1163 | ||
1164 | return ppc_linux_entry_point_addr; | |
1165 | } | |
1166 | ||
1167 | ||
7284e1be UW |
1168 | /* Return 1 if PPC_ORIG_R3_REGNUM and PPC_TRAP_REGNUM are usable. */ |
1169 | int | |
1170 | ppc_linux_trap_reg_p (struct gdbarch *gdbarch) | |
1171 | { | |
1172 | /* If we do not have a target description with registers, then | |
1173 | the special registers will not be included in the register set. */ | |
1174 | if (!tdesc_has_registers (gdbarch_target_desc (gdbarch))) | |
1175 | return 0; | |
1176 | ||
1177 | /* If we do, then it is safe to check the size. */ | |
1178 | return register_size (gdbarch, PPC_ORIG_R3_REGNUM) > 0 | |
1179 | && register_size (gdbarch, PPC_TRAP_REGNUM) > 0; | |
1180 | } | |
1181 | ||
a96d9b2e SDJ |
1182 | /* Return the current system call's number present in the |
1183 | r0 register. When the function fails, it returns -1. */ | |
1184 | static LONGEST | |
1185 | ppc_linux_get_syscall_number (struct gdbarch *gdbarch, | |
1186 | ptid_t ptid) | |
1187 | { | |
1188 | struct regcache *regcache = get_thread_regcache (ptid); | |
1189 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1190 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1191 | struct cleanup *cleanbuf; | |
1192 | /* The content of a register */ | |
1193 | gdb_byte *buf; | |
1194 | /* The result */ | |
1195 | LONGEST ret; | |
1196 | ||
1197 | /* Make sure we're in a 32- or 64-bit machine */ | |
1198 | gdb_assert (tdep->wordsize == 4 || tdep->wordsize == 8); | |
1199 | ||
1200 | buf = (gdb_byte *) xmalloc (tdep->wordsize * sizeof (gdb_byte)); | |
1201 | ||
1202 | cleanbuf = make_cleanup (xfree, buf); | |
1203 | ||
1204 | /* Getting the system call number from the register. | |
1205 | When dealing with PowerPC architecture, this information | |
1206 | is stored at 0th register. */ | |
1207 | regcache_cooked_read (regcache, tdep->ppc_gp0_regnum, buf); | |
1208 | ||
1209 | ret = extract_signed_integer (buf, tdep->wordsize, byte_order); | |
1210 | do_cleanups (cleanbuf); | |
1211 | ||
1212 | return ret; | |
1213 | } | |
1214 | ||
7284e1be UW |
1215 | static void |
1216 | ppc_linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
1217 | { | |
1218 | struct gdbarch *gdbarch = get_regcache_arch (regcache); | |
1219 | ||
1220 | regcache_cooked_write_unsigned (regcache, gdbarch_pc_regnum (gdbarch), pc); | |
1221 | ||
1222 | /* Set special TRAP register to -1 to prevent the kernel from | |
1223 | messing with the PC we just installed, if we happen to be | |
1224 | within an interrupted system call that the kernel wants to | |
1225 | restart. | |
1226 | ||
1227 | Note that after we return from the dummy call, the TRAP and | |
1228 | ORIG_R3 registers will be automatically restored, and the | |
1229 | kernel continues to restart the system call at this point. */ | |
1230 | if (ppc_linux_trap_reg_p (gdbarch)) | |
1231 | regcache_cooked_write_unsigned (regcache, PPC_TRAP_REGNUM, -1); | |
1232 | } | |
1233 | ||
f4d9bade UW |
1234 | static int |
1235 | ppc_linux_spu_section (bfd *abfd, asection *asect, void *user_data) | |
1236 | { | |
1237 | return strncmp (bfd_section_name (abfd, asect), "SPU/", 4) == 0; | |
1238 | } | |
1239 | ||
7284e1be UW |
1240 | static const struct target_desc * |
1241 | ppc_linux_core_read_description (struct gdbarch *gdbarch, | |
1242 | struct target_ops *target, | |
1243 | bfd *abfd) | |
1244 | { | |
f4d9bade | 1245 | asection *cell = bfd_sections_find_if (abfd, ppc_linux_spu_section, NULL); |
7284e1be | 1246 | asection *altivec = bfd_get_section_by_name (abfd, ".reg-ppc-vmx"); |
604c2f83 | 1247 | asection *vsx = bfd_get_section_by_name (abfd, ".reg-ppc-vsx"); |
7284e1be UW |
1248 | asection *section = bfd_get_section_by_name (abfd, ".reg"); |
1249 | if (! section) | |
1250 | return NULL; | |
1251 | ||
1252 | switch (bfd_section_size (abfd, section)) | |
1253 | { | |
1254 | case 48 * 4: | |
f4d9bade UW |
1255 | if (cell) |
1256 | return tdesc_powerpc_cell32l; | |
1257 | else if (vsx) | |
604c2f83 LM |
1258 | return tdesc_powerpc_vsx32l; |
1259 | else if (altivec) | |
1260 | return tdesc_powerpc_altivec32l; | |
1261 | else | |
1262 | return tdesc_powerpc_32l; | |
7284e1be UW |
1263 | |
1264 | case 48 * 8: | |
f4d9bade UW |
1265 | if (cell) |
1266 | return tdesc_powerpc_cell64l; | |
1267 | else if (vsx) | |
604c2f83 LM |
1268 | return tdesc_powerpc_vsx64l; |
1269 | else if (altivec) | |
1270 | return tdesc_powerpc_altivec64l; | |
1271 | else | |
1272 | return tdesc_powerpc_64l; | |
7284e1be UW |
1273 | |
1274 | default: | |
1275 | return NULL; | |
1276 | } | |
1277 | } | |
1278 | ||
cc5f0d61 UW |
1279 | |
1280 | /* Cell/B.E. active SPE context tracking support. */ | |
1281 | ||
1282 | static struct objfile *spe_context_objfile = NULL; | |
1283 | static CORE_ADDR spe_context_lm_addr = 0; | |
1284 | static CORE_ADDR spe_context_offset = 0; | |
1285 | ||
1286 | static ptid_t spe_context_cache_ptid; | |
1287 | static CORE_ADDR spe_context_cache_address; | |
1288 | ||
1289 | /* Hook into inferior_created, solib_loaded, and solib_unloaded observers | |
1290 | to track whether we've loaded a version of libspe2 (as static or dynamic | |
1291 | library) that provides the __spe_current_active_context variable. */ | |
1292 | static void | |
1293 | ppc_linux_spe_context_lookup (struct objfile *objfile) | |
1294 | { | |
1295 | struct minimal_symbol *sym; | |
1296 | ||
1297 | if (!objfile) | |
1298 | { | |
1299 | spe_context_objfile = NULL; | |
1300 | spe_context_lm_addr = 0; | |
1301 | spe_context_offset = 0; | |
1302 | spe_context_cache_ptid = minus_one_ptid; | |
1303 | spe_context_cache_address = 0; | |
1304 | return; | |
1305 | } | |
1306 | ||
1307 | sym = lookup_minimal_symbol ("__spe_current_active_context", NULL, objfile); | |
1308 | if (sym) | |
1309 | { | |
1310 | spe_context_objfile = objfile; | |
1311 | spe_context_lm_addr = svr4_fetch_objfile_link_map (objfile); | |
1312 | spe_context_offset = SYMBOL_VALUE_ADDRESS (sym); | |
1313 | spe_context_cache_ptid = minus_one_ptid; | |
1314 | spe_context_cache_address = 0; | |
1315 | return; | |
1316 | } | |
1317 | } | |
1318 | ||
1319 | static void | |
1320 | ppc_linux_spe_context_inferior_created (struct target_ops *t, int from_tty) | |
1321 | { | |
1322 | struct objfile *objfile; | |
1323 | ||
1324 | ppc_linux_spe_context_lookup (NULL); | |
1325 | ALL_OBJFILES (objfile) | |
1326 | ppc_linux_spe_context_lookup (objfile); | |
1327 | } | |
1328 | ||
1329 | static void | |
1330 | ppc_linux_spe_context_solib_loaded (struct so_list *so) | |
1331 | { | |
1332 | if (strstr (so->so_original_name, "/libspe") != NULL) | |
1333 | { | |
7e559477 | 1334 | solib_read_symbols (so, 0); |
cc5f0d61 UW |
1335 | ppc_linux_spe_context_lookup (so->objfile); |
1336 | } | |
1337 | } | |
1338 | ||
1339 | static void | |
1340 | ppc_linux_spe_context_solib_unloaded (struct so_list *so) | |
1341 | { | |
1342 | if (so->objfile == spe_context_objfile) | |
1343 | ppc_linux_spe_context_lookup (NULL); | |
1344 | } | |
1345 | ||
1346 | /* Retrieve contents of the N'th element in the current thread's | |
1347 | linked SPE context list into ID and NPC. Return the address of | |
1348 | said context element, or 0 if not found. */ | |
1349 | static CORE_ADDR | |
1350 | ppc_linux_spe_context (int wordsize, enum bfd_endian byte_order, | |
1351 | int n, int *id, unsigned int *npc) | |
1352 | { | |
1353 | CORE_ADDR spe_context = 0; | |
1354 | gdb_byte buf[16]; | |
1355 | int i; | |
1356 | ||
1357 | /* Quick exit if we have not found __spe_current_active_context. */ | |
1358 | if (!spe_context_objfile) | |
1359 | return 0; | |
1360 | ||
1361 | /* Look up cached address of thread-local variable. */ | |
1362 | if (!ptid_equal (spe_context_cache_ptid, inferior_ptid)) | |
1363 | { | |
1364 | struct target_ops *target = ¤t_target; | |
1365 | volatile struct gdb_exception ex; | |
1366 | ||
1367 | while (target && !target->to_get_thread_local_address) | |
1368 | target = find_target_beneath (target); | |
1369 | if (!target) | |
1370 | return 0; | |
1371 | ||
1372 | TRY_CATCH (ex, RETURN_MASK_ERROR) | |
1373 | { | |
1374 | /* We do not call target_translate_tls_address here, because | |
1375 | svr4_fetch_objfile_link_map may invalidate the frame chain, | |
1376 | which must not do while inside a frame sniffer. | |
1377 | ||
1378 | Instead, we have cached the lm_addr value, and use that to | |
1379 | directly call the target's to_get_thread_local_address. */ | |
1380 | spe_context_cache_address | |
1381 | = target->to_get_thread_local_address (target, inferior_ptid, | |
1382 | spe_context_lm_addr, | |
1383 | spe_context_offset); | |
1384 | spe_context_cache_ptid = inferior_ptid; | |
1385 | } | |
1386 | ||
1387 | if (ex.reason < 0) | |
1388 | return 0; | |
1389 | } | |
1390 | ||
1391 | /* Read variable value. */ | |
1392 | if (target_read_memory (spe_context_cache_address, buf, wordsize) == 0) | |
1393 | spe_context = extract_unsigned_integer (buf, wordsize, byte_order); | |
1394 | ||
1395 | /* Cyle through to N'th linked list element. */ | |
1396 | for (i = 0; i < n && spe_context; i++) | |
1397 | if (target_read_memory (spe_context + align_up (12, wordsize), | |
1398 | buf, wordsize) == 0) | |
1399 | spe_context = extract_unsigned_integer (buf, wordsize, byte_order); | |
1400 | else | |
1401 | spe_context = 0; | |
1402 | ||
1403 | /* Read current context. */ | |
1404 | if (spe_context | |
1405 | && target_read_memory (spe_context, buf, 12) != 0) | |
1406 | spe_context = 0; | |
1407 | ||
1408 | /* Extract data elements. */ | |
1409 | if (spe_context) | |
1410 | { | |
1411 | if (id) | |
1412 | *id = extract_signed_integer (buf, 4, byte_order); | |
1413 | if (npc) | |
1414 | *npc = extract_unsigned_integer (buf + 4, 4, byte_order); | |
1415 | } | |
1416 | ||
1417 | return spe_context; | |
1418 | } | |
1419 | ||
1420 | ||
1421 | /* Cell/B.E. cross-architecture unwinder support. */ | |
1422 | ||
1423 | struct ppu2spu_cache | |
1424 | { | |
1425 | struct frame_id frame_id; | |
1426 | struct regcache *regcache; | |
1427 | }; | |
1428 | ||
1429 | static struct gdbarch * | |
1430 | ppu2spu_prev_arch (struct frame_info *this_frame, void **this_cache) | |
1431 | { | |
1432 | struct ppu2spu_cache *cache = *this_cache; | |
1433 | return get_regcache_arch (cache->regcache); | |
1434 | } | |
1435 | ||
1436 | static void | |
1437 | ppu2spu_this_id (struct frame_info *this_frame, | |
1438 | void **this_cache, struct frame_id *this_id) | |
1439 | { | |
1440 | struct ppu2spu_cache *cache = *this_cache; | |
1441 | *this_id = cache->frame_id; | |
1442 | } | |
1443 | ||
1444 | static struct value * | |
1445 | ppu2spu_prev_register (struct frame_info *this_frame, | |
1446 | void **this_cache, int regnum) | |
1447 | { | |
1448 | struct ppu2spu_cache *cache = *this_cache; | |
1449 | struct gdbarch *gdbarch = get_regcache_arch (cache->regcache); | |
1450 | gdb_byte *buf; | |
1451 | ||
1452 | buf = alloca (register_size (gdbarch, regnum)); | |
a536c6d7 UW |
1453 | |
1454 | if (regnum < gdbarch_num_regs (gdbarch)) | |
1455 | regcache_raw_read (cache->regcache, regnum, buf); | |
1456 | else | |
1457 | gdbarch_pseudo_register_read (gdbarch, cache->regcache, regnum, buf); | |
1458 | ||
cc5f0d61 UW |
1459 | return frame_unwind_got_bytes (this_frame, regnum, buf); |
1460 | } | |
1461 | ||
1462 | struct ppu2spu_data | |
1463 | { | |
1464 | struct gdbarch *gdbarch; | |
1465 | int id; | |
1466 | unsigned int npc; | |
1467 | gdb_byte gprs[128*16]; | |
1468 | }; | |
1469 | ||
1470 | static int | |
1471 | ppu2spu_unwind_register (void *src, int regnum, gdb_byte *buf) | |
1472 | { | |
1473 | struct ppu2spu_data *data = src; | |
1474 | enum bfd_endian byte_order = gdbarch_byte_order (data->gdbarch); | |
1475 | ||
1476 | if (regnum >= 0 && regnum < SPU_NUM_GPRS) | |
1477 | memcpy (buf, data->gprs + 16*regnum, 16); | |
1478 | else if (regnum == SPU_ID_REGNUM) | |
1479 | store_unsigned_integer (buf, 4, byte_order, data->id); | |
1480 | else if (regnum == SPU_PC_REGNUM) | |
1481 | store_unsigned_integer (buf, 4, byte_order, data->npc); | |
1482 | else | |
a536c6d7 | 1483 | return REG_UNAVAILABLE; |
cc5f0d61 | 1484 | |
a536c6d7 | 1485 | return REG_VALID; |
cc5f0d61 UW |
1486 | } |
1487 | ||
1488 | static int | |
1489 | ppu2spu_sniffer (const struct frame_unwind *self, | |
1490 | struct frame_info *this_frame, void **this_prologue_cache) | |
1491 | { | |
1492 | struct gdbarch *gdbarch = get_frame_arch (this_frame); | |
1493 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
1494 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
1495 | struct ppu2spu_data data; | |
1496 | struct frame_info *fi; | |
1497 | CORE_ADDR base, func, backchain, spe_context; | |
1498 | gdb_byte buf[8]; | |
1499 | int n = 0; | |
1500 | ||
1501 | /* Count the number of SPU contexts already in the frame chain. */ | |
1502 | for (fi = get_next_frame (this_frame); fi; fi = get_next_frame (fi)) | |
1503 | if (get_frame_type (fi) == ARCH_FRAME | |
1504 | && gdbarch_bfd_arch_info (get_frame_arch (fi))->arch == bfd_arch_spu) | |
1505 | n++; | |
1506 | ||
1507 | base = get_frame_sp (this_frame); | |
1508 | func = get_frame_pc (this_frame); | |
1509 | if (target_read_memory (base, buf, tdep->wordsize)) | |
1510 | return 0; | |
1511 | backchain = extract_unsigned_integer (buf, tdep->wordsize, byte_order); | |
1512 | ||
1513 | spe_context = ppc_linux_spe_context (tdep->wordsize, byte_order, | |
1514 | n, &data.id, &data.npc); | |
1515 | if (spe_context && base <= spe_context && spe_context < backchain) | |
1516 | { | |
1517 | char annex[32]; | |
1518 | ||
1519 | /* Find gdbarch for SPU. */ | |
1520 | struct gdbarch_info info; | |
1521 | gdbarch_info_init (&info); | |
1522 | info.bfd_arch_info = bfd_lookup_arch (bfd_arch_spu, bfd_mach_spu); | |
1523 | info.byte_order = BFD_ENDIAN_BIG; | |
1524 | info.osabi = GDB_OSABI_LINUX; | |
1525 | info.tdep_info = (void *) &data.id; | |
1526 | data.gdbarch = gdbarch_find_by_info (info); | |
1527 | if (!data.gdbarch) | |
1528 | return 0; | |
1529 | ||
1530 | xsnprintf (annex, sizeof annex, "%d/regs", data.id); | |
1531 | if (target_read (¤t_target, TARGET_OBJECT_SPU, annex, | |
1532 | data.gprs, 0, sizeof data.gprs) | |
1533 | == sizeof data.gprs) | |
1534 | { | |
1535 | struct ppu2spu_cache *cache | |
1536 | = FRAME_OBSTACK_CALLOC (1, struct ppu2spu_cache); | |
1537 | ||
d37346f0 DJ |
1538 | struct address_space *aspace = get_frame_address_space (this_frame); |
1539 | struct regcache *regcache = regcache_xmalloc (data.gdbarch, aspace); | |
cc5f0d61 UW |
1540 | struct cleanup *cleanups = make_cleanup_regcache_xfree (regcache); |
1541 | regcache_save (regcache, ppu2spu_unwind_register, &data); | |
1542 | discard_cleanups (cleanups); | |
1543 | ||
1544 | cache->frame_id = frame_id_build (base, func); | |
1545 | cache->regcache = regcache; | |
1546 | *this_prologue_cache = cache; | |
1547 | return 1; | |
1548 | } | |
1549 | } | |
1550 | ||
1551 | return 0; | |
1552 | } | |
1553 | ||
1554 | static void | |
1555 | ppu2spu_dealloc_cache (struct frame_info *self, void *this_cache) | |
1556 | { | |
1557 | struct ppu2spu_cache *cache = this_cache; | |
1558 | regcache_xfree (cache->regcache); | |
1559 | } | |
1560 | ||
1561 | static const struct frame_unwind ppu2spu_unwind = { | |
1562 | ARCH_FRAME, | |
8fbca658 | 1563 | default_frame_unwind_stop_reason, |
cc5f0d61 UW |
1564 | ppu2spu_this_id, |
1565 | ppu2spu_prev_register, | |
1566 | NULL, | |
1567 | ppu2spu_sniffer, | |
1568 | ppu2spu_dealloc_cache, | |
1569 | ppu2spu_prev_arch, | |
1570 | }; | |
1571 | ||
1572 | ||
7b112f9c JT |
1573 | static void |
1574 | ppc_linux_init_abi (struct gdbarch_info info, | |
1575 | struct gdbarch *gdbarch) | |
1576 | { | |
1577 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
7284e1be | 1578 | struct tdesc_arch_data *tdesc_data = (void *) info.tdep_info; |
7b112f9c | 1579 | |
a5ee0f0c PA |
1580 | linux_init_abi (info, gdbarch); |
1581 | ||
b14d30e1 JM |
1582 | /* PPC GNU/Linux uses either 64-bit or 128-bit long doubles; where |
1583 | 128-bit, they are IBM long double, not IEEE quad long double as | |
1584 | in the System V ABI PowerPC Processor Supplement. We can safely | |
1585 | let them default to 128-bit, since the debug info will give the | |
1586 | size of type actually used in each case. */ | |
1587 | set_gdbarch_long_double_bit (gdbarch, 16 * TARGET_CHAR_BIT); | |
1588 | set_gdbarch_long_double_format (gdbarch, floatformats_ibm_long_double); | |
0598a43c | 1589 | |
7284e1be UW |
1590 | /* Handle inferior calls during interrupted system calls. */ |
1591 | set_gdbarch_write_pc (gdbarch, ppc_linux_write_pc); | |
1592 | ||
a96d9b2e SDJ |
1593 | /* Get the syscall number from the arch's register. */ |
1594 | set_gdbarch_get_syscall_number (gdbarch, ppc_linux_get_syscall_number); | |
1595 | ||
7b112f9c JT |
1596 | if (tdep->wordsize == 4) |
1597 | { | |
b9ff3018 AC |
1598 | /* Until November 2001, gcc did not comply with the 32 bit SysV |
1599 | R4 ABI requirement that structures less than or equal to 8 | |
1600 | bytes should be returned in registers. Instead GCC was using | |
b021a221 | 1601 | the AIX/PowerOpen ABI - everything returned in memory |
b9ff3018 AC |
1602 | (well ignoring vectors that is). When this was corrected, it |
1603 | wasn't fixed for GNU/Linux native platform. Use the | |
1604 | PowerOpen struct convention. */ | |
05580c65 | 1605 | set_gdbarch_return_value (gdbarch, ppc_linux_return_value); |
b9ff3018 | 1606 | |
7b112f9c JT |
1607 | set_gdbarch_memory_remove_breakpoint (gdbarch, |
1608 | ppc_linux_memory_remove_breakpoint); | |
61a65099 | 1609 | |
f470a70a | 1610 | /* Shared library handling. */ |
5d853008 | 1611 | set_gdbarch_skip_trampoline_code (gdbarch, ppc_skip_trampoline_code); |
7b112f9c | 1612 | set_solib_svr4_fetch_link_map_offsets |
76a9d10f | 1613 | (gdbarch, svr4_ilp32_fetch_link_map_offsets); |
a8f60bfc | 1614 | |
a96d9b2e SDJ |
1615 | /* Setting the correct XML syscall filename. */ |
1616 | set_xml_syscall_file_name (XML_SYSCALL_FILENAME_PPC); | |
1617 | ||
a8f60bfc | 1618 | /* Trampolines. */ |
0df8b418 MS |
1619 | tramp_frame_prepend_unwinder (gdbarch, |
1620 | &ppc32_linux_sigaction_tramp_frame); | |
1621 | tramp_frame_prepend_unwinder (gdbarch, | |
1622 | &ppc32_linux_sighandler_tramp_frame); | |
a78c2d62 UW |
1623 | |
1624 | /* BFD target for core files. */ | |
1625 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_LITTLE) | |
1626 | set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpcle"); | |
1627 | else | |
1628 | set_gdbarch_gcore_bfd_target (gdbarch, "elf32-powerpc"); | |
2f2241f1 UW |
1629 | |
1630 | /* Supported register sections. */ | |
1631 | if (tdesc_find_feature (info.target_desc, | |
1632 | "org.gnu.gdb.power.vsx")) | |
1633 | set_gdbarch_core_regset_sections (gdbarch, | |
1634 | ppc_linux_vsx_regset_sections); | |
1635 | else if (tdesc_find_feature (info.target_desc, | |
1636 | "org.gnu.gdb.power.altivec")) | |
1637 | set_gdbarch_core_regset_sections (gdbarch, | |
1638 | ppc_linux_vmx_regset_sections); | |
1639 | else | |
1640 | set_gdbarch_core_regset_sections (gdbarch, | |
1641 | ppc_linux_fp_regset_sections); | |
5d853008 ME |
1642 | |
1643 | if (powerpc_so_ops.in_dynsym_resolve_code == NULL) | |
1644 | { | |
1645 | powerpc_so_ops = svr4_so_ops; | |
1646 | /* Override dynamic resolve function. */ | |
1647 | powerpc_so_ops.in_dynsym_resolve_code = | |
1648 | powerpc_linux_in_dynsym_resolve_code; | |
1649 | } | |
1650 | set_solib_ops (gdbarch, &powerpc_so_ops); | |
1651 | ||
1652 | set_gdbarch_skip_solib_resolver (gdbarch, glibc_skip_solib_resolver); | |
7b112f9c | 1653 | } |
f470a70a JB |
1654 | |
1655 | if (tdep->wordsize == 8) | |
1656 | { | |
00d5f93a UW |
1657 | /* Handle PPC GNU/Linux 64-bit function pointers (which are really |
1658 | function descriptors). */ | |
1659 | set_gdbarch_convert_from_func_ptr_addr | |
1660 | (gdbarch, ppc64_linux_convert_from_func_ptr_addr); | |
1661 | ||
fb318ff7 | 1662 | /* Shared library handling. */ |
2bbe3cc1 | 1663 | set_gdbarch_skip_trampoline_code (gdbarch, ppc64_skip_trampoline_code); |
fb318ff7 DJ |
1664 | set_solib_svr4_fetch_link_map_offsets |
1665 | (gdbarch, svr4_lp64_fetch_link_map_offsets); | |
1666 | ||
a96d9b2e SDJ |
1667 | /* Setting the correct XML syscall filename. */ |
1668 | set_xml_syscall_file_name (XML_SYSCALL_FILENAME_PPC64); | |
1669 | ||
a8f60bfc | 1670 | /* Trampolines. */ |
0df8b418 MS |
1671 | tramp_frame_prepend_unwinder (gdbarch, |
1672 | &ppc64_linux_sigaction_tramp_frame); | |
1673 | tramp_frame_prepend_unwinder (gdbarch, | |
1674 | &ppc64_linux_sighandler_tramp_frame); | |
a78c2d62 UW |
1675 | |
1676 | /* BFD target for core files. */ | |
1677 | if (gdbarch_byte_order (gdbarch) == BFD_ENDIAN_LITTLE) | |
1678 | set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpcle"); | |
1679 | else | |
1680 | set_gdbarch_gcore_bfd_target (gdbarch, "elf64-powerpc"); | |
2f2241f1 UW |
1681 | |
1682 | /* Supported register sections. */ | |
1683 | if (tdesc_find_feature (info.target_desc, | |
1684 | "org.gnu.gdb.power.vsx")) | |
1685 | set_gdbarch_core_regset_sections (gdbarch, | |
1686 | ppc64_linux_vsx_regset_sections); | |
1687 | else if (tdesc_find_feature (info.target_desc, | |
1688 | "org.gnu.gdb.power.altivec")) | |
1689 | set_gdbarch_core_regset_sections (gdbarch, | |
1690 | ppc64_linux_vmx_regset_sections); | |
1691 | else | |
1692 | set_gdbarch_core_regset_sections (gdbarch, | |
1693 | ppc64_linux_fp_regset_sections); | |
f470a70a | 1694 | } |
0df8b418 MS |
1695 | set_gdbarch_regset_from_core_section (gdbarch, |
1696 | ppc_linux_regset_from_core_section); | |
7284e1be | 1697 | set_gdbarch_core_read_description (gdbarch, ppc_linux_core_read_description); |
b2756930 KB |
1698 | |
1699 | /* Enable TLS support. */ | |
1700 | set_gdbarch_fetch_tls_load_module_address (gdbarch, | |
1701 | svr4_fetch_objfile_link_map); | |
7284e1be UW |
1702 | |
1703 | if (tdesc_data) | |
1704 | { | |
1705 | const struct tdesc_feature *feature; | |
1706 | ||
1707 | /* If we have target-described registers, then we can safely | |
1708 | reserve a number for PPC_ORIG_R3_REGNUM and PPC_TRAP_REGNUM | |
1709 | (whether they are described or not). */ | |
1710 | gdb_assert (gdbarch_num_regs (gdbarch) <= PPC_ORIG_R3_REGNUM); | |
1711 | set_gdbarch_num_regs (gdbarch, PPC_TRAP_REGNUM + 1); | |
1712 | ||
1713 | /* If they are present, then assign them to the reserved number. */ | |
1714 | feature = tdesc_find_feature (info.target_desc, | |
1715 | "org.gnu.gdb.power.linux"); | |
1716 | if (feature != NULL) | |
1717 | { | |
1718 | tdesc_numbered_register (feature, tdesc_data, | |
1719 | PPC_ORIG_R3_REGNUM, "orig_r3"); | |
1720 | tdesc_numbered_register (feature, tdesc_data, | |
1721 | PPC_TRAP_REGNUM, "trap"); | |
1722 | } | |
1723 | } | |
85e747d2 UW |
1724 | |
1725 | /* Enable Cell/B.E. if supported by the target. */ | |
1726 | if (tdesc_compatible_p (info.target_desc, | |
1727 | bfd_lookup_arch (bfd_arch_spu, bfd_mach_spu))) | |
1728 | { | |
1729 | /* Cell/B.E. multi-architecture support. */ | |
1730 | set_spu_solib_ops (gdbarch); | |
1731 | ||
cc5f0d61 UW |
1732 | /* Cell/B.E. cross-architecture unwinder support. */ |
1733 | frame_unwind_prepend_unwinder (gdbarch, &ppu2spu_unwind); | |
1734 | ||
85e747d2 UW |
1735 | /* The default displaced_step_at_entry_point doesn't work for |
1736 | SPU stand-alone executables. */ | |
1737 | set_gdbarch_displaced_step_location (gdbarch, | |
1738 | ppc_linux_displaced_step_location); | |
1739 | } | |
7b112f9c JT |
1740 | } |
1741 | ||
63807e1d PA |
1742 | /* Provide a prototype to silence -Wmissing-prototypes. */ |
1743 | extern initialize_file_ftype _initialize_ppc_linux_tdep; | |
1744 | ||
7b112f9c JT |
1745 | void |
1746 | _initialize_ppc_linux_tdep (void) | |
1747 | { | |
0a0a4ac3 AC |
1748 | /* Register for all sub-familes of the POWER/PowerPC: 32-bit and |
1749 | 64-bit PowerPC, and the older rs6k. */ | |
1750 | gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc, GDB_OSABI_LINUX, | |
1751 | ppc_linux_init_abi); | |
1752 | gdbarch_register_osabi (bfd_arch_powerpc, bfd_mach_ppc64, GDB_OSABI_LINUX, | |
1753 | ppc_linux_init_abi); | |
1754 | gdbarch_register_osabi (bfd_arch_rs6000, bfd_mach_rs6k, GDB_OSABI_LINUX, | |
1755 | ppc_linux_init_abi); | |
7284e1be | 1756 | |
85e747d2 UW |
1757 | /* Attach to inferior_created observer. */ |
1758 | observer_attach_inferior_created (ppc_linux_inferior_created); | |
1759 | ||
cc5f0d61 UW |
1760 | /* Attach to observers to track __spe_current_active_context. */ |
1761 | observer_attach_inferior_created (ppc_linux_spe_context_inferior_created); | |
1762 | observer_attach_solib_loaded (ppc_linux_spe_context_solib_loaded); | |
1763 | observer_attach_solib_unloaded (ppc_linux_spe_context_solib_unloaded); | |
1764 | ||
7284e1be UW |
1765 | /* Initialize the Linux target descriptions. */ |
1766 | initialize_tdesc_powerpc_32l (); | |
1767 | initialize_tdesc_powerpc_altivec32l (); | |
f4d9bade | 1768 | initialize_tdesc_powerpc_cell32l (); |
604c2f83 | 1769 | initialize_tdesc_powerpc_vsx32l (); |
69abc51c TJB |
1770 | initialize_tdesc_powerpc_isa205_32l (); |
1771 | initialize_tdesc_powerpc_isa205_altivec32l (); | |
1772 | initialize_tdesc_powerpc_isa205_vsx32l (); | |
7284e1be UW |
1773 | initialize_tdesc_powerpc_64l (); |
1774 | initialize_tdesc_powerpc_altivec64l (); | |
f4d9bade | 1775 | initialize_tdesc_powerpc_cell64l (); |
604c2f83 | 1776 | initialize_tdesc_powerpc_vsx64l (); |
69abc51c TJB |
1777 | initialize_tdesc_powerpc_isa205_64l (); |
1778 | initialize_tdesc_powerpc_isa205_altivec64l (); | |
1779 | initialize_tdesc_powerpc_isa205_vsx64l (); | |
7284e1be | 1780 | initialize_tdesc_powerpc_e500l (); |
7b112f9c | 1781 | } |