1 /* Target-dependent code for GDB, the GNU debugger.
3 Copyright (C) 1986-2014 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
33 #include "solib-svr4.h"
34 #include "solib-spu.h"
38 #include "ppc64-tdep.h"
39 #include "ppc-linux-tdep.h"
40 #include "glibc-tdep.h"
41 #include "trad-frame.h"
42 #include "frame-unwind.h"
43 #include "tramp-frame.h"
46 #include "elf/common.h"
47 #include "elf/ppc64.h"
48 #include "exceptions.h"
49 #include "arch-utils.h"
51 #include "xml-syscall.h"
52 #include "linux-tdep.h"
54 #include "stap-probe.h"
57 #include "cli/cli-utils.h"
58 #include "parser-defs.h"
59 #include "user-regs.h"
61 #include "elf-bfd.h" /* for elfcore_write_* */
63 #include "features/rs6000/powerpc-32l.c"
64 #include "features/rs6000/powerpc-altivec32l.c"
65 #include "features/rs6000/powerpc-cell32l.c"
66 #include "features/rs6000/powerpc-vsx32l.c"
67 #include "features/rs6000/powerpc-isa205-32l.c"
68 #include "features/rs6000/powerpc-isa205-altivec32l.c"
69 #include "features/rs6000/powerpc-isa205-vsx32l.c"
70 #include "features/rs6000/powerpc-64l.c"
71 #include "features/rs6000/powerpc-altivec64l.c"
72 #include "features/rs6000/powerpc-cell64l.c"
73 #include "features/rs6000/powerpc-vsx64l.c"
74 #include "features/rs6000/powerpc-isa205-64l.c"
75 #include "features/rs6000/powerpc-isa205-altivec64l.c"
76 #include "features/rs6000/powerpc-isa205-vsx64l.c"
77 #include "features/rs6000/powerpc-e500l.c"
79 /* Shared library operations for PowerPC-Linux. */
80 static struct target_so_ops powerpc_so_ops
;
82 /* The syscall's XML filename for PPC and PPC64. */
83 #define XML_SYSCALL_FILENAME_PPC "syscalls/ppc-linux.xml"
84 #define XML_SYSCALL_FILENAME_PPC64 "syscalls/ppc64-linux.xml"
86 /* ppc_linux_memory_remove_breakpoints attempts to remove a breakpoint
87 in much the same fashion as memory_remove_breakpoint in mem-break.c,
88 but is careful not to write back the previous contents if the code
89 in question has changed in between inserting the breakpoint and
92 Here is the problem that we're trying to solve...
94 Once upon a time, before introducing this function to remove
95 breakpoints from the inferior, setting a breakpoint on a shared
96 library function prior to running the program would not work
97 properly. In order to understand the problem, it is first
98 necessary to understand a little bit about dynamic linking on
101 A call to a shared library function is accomplished via a bl
102 (branch-and-link) instruction whose branch target is an entry
103 in the procedure linkage table (PLT). The PLT in the object
104 file is uninitialized. To gdb, prior to running the program, the
105 entries in the PLT are all zeros.
107 Once the program starts running, the shared libraries are loaded
108 and the procedure linkage table is initialized, but the entries in
109 the table are not (necessarily) resolved. Once a function is
110 actually called, the code in the PLT is hit and the function is
111 resolved. In order to better illustrate this, an example is in
112 order; the following example is from the gdb testsuite.
114 We start the program shmain.
116 [kev@arroyo testsuite]$ ../gdb gdb.base/shmain
119 We place two breakpoints, one on shr1 and the other on main.
122 Breakpoint 1 at 0x100409d4
124 Breakpoint 2 at 0x100006a0: file gdb.base/shmain.c, line 44.
126 Examine the instruction (and the immediatly following instruction)
127 upon which the breakpoint was placed. Note that the PLT entry
128 for shr1 contains zeros.
130 (gdb) x/2i 0x100409d4
131 0x100409d4 <shr1>: .long 0x0
132 0x100409d8 <shr1+4>: .long 0x0
137 Starting program: gdb.base/shmain
138 Breakpoint 1 at 0xffaf790: file gdb.base/shr1.c, line 19.
140 Breakpoint 2, main ()
141 at gdb.base/shmain.c:44
144 Examine the PLT again. Note that the loading of the shared
145 library has initialized the PLT to code which loads a constant
146 (which I think is an index into the GOT) into r11 and then
147 branchs a short distance to the code which actually does the
150 (gdb) x/2i 0x100409d4
151 0x100409d4 <shr1>: li r11,4
152 0x100409d8 <shr1+4>: b 0x10040984 <sg+4>
156 Breakpoint 1, shr1 (x=1)
157 at gdb.base/shr1.c:19
160 Now we've hit the breakpoint at shr1. (The breakpoint was
161 reset from the PLT entry to the actual shr1 function after the
162 shared library was loaded.) Note that the PLT entry has been
163 resolved to contain a branch that takes us directly to shr1.
164 (The real one, not the PLT entry.)
166 (gdb) x/2i 0x100409d4
167 0x100409d4 <shr1>: b 0xffaf76c <shr1>
168 0x100409d8 <shr1+4>: b 0x10040984 <sg+4>
170 The thing to note here is that the PLT entry for shr1 has been
173 Now the problem should be obvious. GDB places a breakpoint (a
174 trap instruction) on the zero value of the PLT entry for shr1.
175 Later on, after the shared library had been loaded and the PLT
176 initialized, GDB gets a signal indicating this fact and attempts
177 (as it always does when it stops) to remove all the breakpoints.
179 The breakpoint removal was causing the former contents (a zero
180 word) to be written back to the now initialized PLT entry thus
181 destroying a portion of the initialization that had occurred only a
182 short time ago. When execution continued, the zero word would be
183 executed as an instruction an illegal instruction trap was
184 generated instead. (0 is not a legal instruction.)
186 The fix for this problem was fairly straightforward. The function
187 memory_remove_breakpoint from mem-break.c was copied to this file,
188 modified slightly, and renamed to ppc_linux_memory_remove_breakpoint.
189 In tm-linux.h, MEMORY_REMOVE_BREAKPOINT is defined to call this new
192 The differences between ppc_linux_memory_remove_breakpoint () and
193 memory_remove_breakpoint () are minor. All that the former does
194 that the latter does not is check to make sure that the breakpoint
195 location actually contains a breakpoint (trap instruction) prior
196 to attempting to write back the old contents. If it does contain
197 a trap instruction, we allow the old contents to be written back.
198 Otherwise, we silently do nothing.
200 The big question is whether memory_remove_breakpoint () should be
201 changed to have the same functionality. The downside is that more
202 traffic is generated for remote targets since we'll have an extra
203 fetch of a memory word each time a breakpoint is removed.
205 For the time being, we'll leave this self-modifying-code-friendly
206 version in ppc-linux-tdep.c, but it ought to be migrated somewhere
207 else in the event that some other platform has similar needs with
208 regard to removing breakpoints in some potentially self modifying
211 ppc_linux_memory_remove_breakpoint (struct gdbarch
*gdbarch
,
212 struct bp_target_info
*bp_tgt
)
214 CORE_ADDR addr
= bp_tgt
->placed_address
;
215 const unsigned char *bp
;
218 gdb_byte old_contents
[BREAKPOINT_MAX
];
219 struct cleanup
*cleanup
;
221 /* Determine appropriate breakpoint contents and size for this address. */
222 bp
= gdbarch_breakpoint_from_pc (gdbarch
, &addr
, &bplen
);
224 error (_("Software breakpoints not implemented for this target."));
226 /* Make sure we see the memory breakpoints. */
227 cleanup
= make_show_memory_breakpoints_cleanup (1);
228 val
= target_read_memory (addr
, old_contents
, bplen
);
230 /* If our breakpoint is no longer at the address, this means that the
231 program modified the code on us, so it is wrong to put back the
233 if (val
== 0 && memcmp (bp
, old_contents
, bplen
) == 0)
234 val
= target_write_raw_memory (addr
, bp_tgt
->shadow_contents
, bplen
);
236 do_cleanups (cleanup
);
240 /* For historic reasons, PPC 32 GNU/Linux follows PowerOpen rather
241 than the 32 bit SYSV R4 ABI structure return convention - all
242 structures, no matter their size, are put in memory. Vectors,
243 which were added later, do get returned in a register though. */
245 static enum return_value_convention
246 ppc_linux_return_value (struct gdbarch
*gdbarch
, struct value
*function
,
247 struct type
*valtype
, struct regcache
*regcache
,
248 gdb_byte
*readbuf
, const gdb_byte
*writebuf
)
250 if ((TYPE_CODE (valtype
) == TYPE_CODE_STRUCT
251 || TYPE_CODE (valtype
) == TYPE_CODE_UNION
)
252 && !((TYPE_LENGTH (valtype
) == 16 || TYPE_LENGTH (valtype
) == 8)
253 && TYPE_VECTOR (valtype
)))
254 return RETURN_VALUE_STRUCT_CONVENTION
;
256 return ppc_sysv_abi_return_value (gdbarch
, function
, valtype
, regcache
,
260 /* PLT stub in executable. */
261 static struct ppc_insn_pattern powerpc32_plt_stub
[] =
263 { 0xffff0000, 0x3d600000, 0 }, /* lis r11, xxxx */
264 { 0xffff0000, 0x816b0000, 0 }, /* lwz r11, xxxx(r11) */
265 { 0xffffffff, 0x7d6903a6, 0 }, /* mtctr r11 */
266 { 0xffffffff, 0x4e800420, 0 }, /* bctr */
270 /* PLT stub in shared library. */
271 static struct ppc_insn_pattern powerpc32_plt_stub_so
[] =
273 { 0xffff0000, 0x817e0000, 0 }, /* lwz r11, xxxx(r30) */
274 { 0xffffffff, 0x7d6903a6, 0 }, /* mtctr r11 */
275 { 0xffffffff, 0x4e800420, 0 }, /* bctr */
276 { 0xffffffff, 0x60000000, 0 }, /* nop */
279 #define POWERPC32_PLT_STUB_LEN ARRAY_SIZE (powerpc32_plt_stub)
281 /* Check if PC is in PLT stub. For non-secure PLT, stub is in .plt
282 section. For secure PLT, stub is in .text and we need to check
283 instruction patterns. */
286 powerpc_linux_in_dynsym_resolve_code (CORE_ADDR pc
)
288 struct bound_minimal_symbol sym
;
290 /* Check whether PC is in the dynamic linker. This also checks
291 whether it is in the .plt section, used by non-PIC executables. */
292 if (svr4_in_dynsym_resolve_code (pc
))
295 /* Check if we are in the resolver. */
296 sym
= lookup_minimal_symbol_by_pc (pc
);
297 if (sym
.minsym
!= NULL
298 && (strcmp (MSYMBOL_LINKAGE_NAME (sym
.minsym
), "__glink") == 0
299 || strcmp (MSYMBOL_LINKAGE_NAME (sym
.minsym
),
300 "__glink_PLTresolve") == 0))
306 /* Follow PLT stub to actual routine. */
309 ppc_skip_trampoline_code (struct frame_info
*frame
, CORE_ADDR pc
)
311 unsigned int insnbuf
[POWERPC32_PLT_STUB_LEN
];
312 struct gdbarch
*gdbarch
= get_frame_arch (frame
);
313 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
314 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
315 CORE_ADDR target
= 0;
317 if (ppc_insns_match_pattern (frame
, pc
, powerpc32_plt_stub
, insnbuf
))
322 Branch target is in r11. */
324 target
= (ppc_insn_d_field (insnbuf
[0]) << 16)
325 | ppc_insn_d_field (insnbuf
[1]);
326 target
= read_memory_unsigned_integer (target
, 4, byte_order
);
329 if (ppc_insns_match_pattern (frame
, pc
, powerpc32_plt_stub_so
, insnbuf
))
333 Branch target is in r11. */
335 target
= get_frame_register_unsigned (frame
, tdep
->ppc_gp0_regnum
+ 30)
336 + ppc_insn_d_field (insnbuf
[0]);
337 target
= read_memory_unsigned_integer (target
, 4, byte_order
);
343 /* Wrappers to handle Linux-only registers. */
346 ppc_linux_supply_gregset (const struct regset
*regset
,
347 struct regcache
*regcache
,
348 int regnum
, const void *gregs
, size_t len
)
350 const struct ppc_reg_offsets
*offsets
= regset
->regmap
;
352 ppc_supply_gregset (regset
, regcache
, regnum
, gregs
, len
);
354 if (ppc_linux_trap_reg_p (get_regcache_arch (regcache
)))
356 /* "orig_r3" is stored 2 slots after "pc". */
357 if (regnum
== -1 || regnum
== PPC_ORIG_R3_REGNUM
)
358 ppc_supply_reg (regcache
, PPC_ORIG_R3_REGNUM
, gregs
,
359 offsets
->pc_offset
+ 2 * offsets
->gpr_size
,
362 /* "trap" is stored 8 slots after "pc". */
363 if (regnum
== -1 || regnum
== PPC_TRAP_REGNUM
)
364 ppc_supply_reg (regcache
, PPC_TRAP_REGNUM
, gregs
,
365 offsets
->pc_offset
+ 8 * offsets
->gpr_size
,
371 ppc_linux_collect_gregset (const struct regset
*regset
,
372 const struct regcache
*regcache
,
373 int regnum
, void *gregs
, size_t len
)
375 const struct ppc_reg_offsets
*offsets
= regset
->regmap
;
377 /* Clear areas in the linux gregset not written elsewhere. */
379 memset (gregs
, 0, len
);
381 ppc_collect_gregset (regset
, regcache
, regnum
, gregs
, len
);
383 if (ppc_linux_trap_reg_p (get_regcache_arch (regcache
)))
385 /* "orig_r3" is stored 2 slots after "pc". */
386 if (regnum
== -1 || regnum
== PPC_ORIG_R3_REGNUM
)
387 ppc_collect_reg (regcache
, PPC_ORIG_R3_REGNUM
, gregs
,
388 offsets
->pc_offset
+ 2 * offsets
->gpr_size
,
391 /* "trap" is stored 8 slots after "pc". */
392 if (regnum
== -1 || regnum
== PPC_TRAP_REGNUM
)
393 ppc_collect_reg (regcache
, PPC_TRAP_REGNUM
, gregs
,
394 offsets
->pc_offset
+ 8 * offsets
->gpr_size
,
399 /* Regset descriptions. */
400 static const struct ppc_reg_offsets ppc32_linux_reg_offsets
=
402 /* General-purpose registers. */
403 /* .r0_offset = */ 0,
406 /* .pc_offset = */ 128,
407 /* .ps_offset = */ 132,
408 /* .cr_offset = */ 152,
409 /* .lr_offset = */ 144,
410 /* .ctr_offset = */ 140,
411 /* .xer_offset = */ 148,
412 /* .mq_offset = */ 156,
414 /* Floating-point registers. */
415 /* .f0_offset = */ 0,
416 /* .fpscr_offset = */ 256,
417 /* .fpscr_size = */ 8,
419 /* AltiVec registers. */
420 /* .vr0_offset = */ 0,
421 /* .vscr_offset = */ 512 + 12,
422 /* .vrsave_offset = */ 528
425 static const struct ppc_reg_offsets ppc64_linux_reg_offsets
=
427 /* General-purpose registers. */
428 /* .r0_offset = */ 0,
431 /* .pc_offset = */ 256,
432 /* .ps_offset = */ 264,
433 /* .cr_offset = */ 304,
434 /* .lr_offset = */ 288,
435 /* .ctr_offset = */ 280,
436 /* .xer_offset = */ 296,
437 /* .mq_offset = */ 312,
439 /* Floating-point registers. */
440 /* .f0_offset = */ 0,
441 /* .fpscr_offset = */ 256,
442 /* .fpscr_size = */ 8,
444 /* AltiVec registers. */
445 /* .vr0_offset = */ 0,
446 /* .vscr_offset = */ 512 + 12,
447 /* .vrsave_offset = */ 528
450 static const struct regset ppc32_linux_gregset
= {
451 &ppc32_linux_reg_offsets
,
452 ppc_linux_supply_gregset
,
453 ppc_linux_collect_gregset
456 static const struct regset ppc64_linux_gregset
= {
457 &ppc64_linux_reg_offsets
,
458 ppc_linux_supply_gregset
,
459 ppc_linux_collect_gregset
462 static const struct regset ppc32_linux_fpregset
= {
463 &ppc32_linux_reg_offsets
,
468 static const struct regset ppc32_linux_vrregset
= {
469 &ppc32_linux_reg_offsets
,
474 static const struct regset ppc32_linux_vsxregset
= {
475 &ppc32_linux_reg_offsets
,
476 ppc_supply_vsxregset
,
477 ppc_collect_vsxregset
480 const struct regset
*
481 ppc_linux_gregset (int wordsize
)
483 return wordsize
== 8 ? &ppc64_linux_gregset
: &ppc32_linux_gregset
;
486 const struct regset
*
487 ppc_linux_fpregset (void)
489 return &ppc32_linux_fpregset
;
492 /* Iterate over supported core file register note sections. */
495 ppc_linux_iterate_over_regset_sections (struct gdbarch
*gdbarch
,
496 iterate_over_regset_sections_cb
*cb
,
498 const struct regcache
*regcache
)
500 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
501 int have_altivec
= tdep
->ppc_vr0_regnum
!= -1;
502 int have_vsx
= tdep
->ppc_vsr0_upper_regnum
!= -1;
504 if (tdep
->wordsize
== 4)
505 cb (".reg", 48 * 4, &ppc32_linux_gregset
, NULL
, cb_data
);
507 cb (".reg", 48 * 8, &ppc64_linux_gregset
, NULL
, cb_data
);
509 cb (".reg2", 264, &ppc32_linux_fpregset
, NULL
, cb_data
);
512 cb (".reg-ppc-vmx", 544, &ppc32_linux_vrregset
, "ppc Altivec", cb_data
);
515 cb (".reg-ppc-vsx", 256, &ppc32_linux_vsxregset
, "POWER7 VSX", cb_data
);
519 ppc_linux_sigtramp_cache (struct frame_info
*this_frame
,
520 struct trad_frame_cache
*this_cache
,
521 CORE_ADDR func
, LONGEST offset
,
529 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
530 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
531 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
533 base
= get_frame_register_unsigned (this_frame
,
534 gdbarch_sp_regnum (gdbarch
));
535 if (bias
> 0 && get_frame_pc (this_frame
) != func
)
536 /* See below, some signal trampolines increment the stack as their
537 first instruction, need to compensate for that. */
540 /* Find the address of the register buffer pointer. */
541 regs
= base
+ offset
;
542 /* Use that to find the address of the corresponding register
544 gpregs
= read_memory_unsigned_integer (regs
, tdep
->wordsize
, byte_order
);
545 fpregs
= gpregs
+ 48 * tdep
->wordsize
;
547 /* General purpose. */
548 for (i
= 0; i
< 32; i
++)
550 int regnum
= i
+ tdep
->ppc_gp0_regnum
;
551 trad_frame_set_reg_addr (this_cache
,
552 regnum
, gpregs
+ i
* tdep
->wordsize
);
554 trad_frame_set_reg_addr (this_cache
,
555 gdbarch_pc_regnum (gdbarch
),
556 gpregs
+ 32 * tdep
->wordsize
);
557 trad_frame_set_reg_addr (this_cache
, tdep
->ppc_ctr_regnum
,
558 gpregs
+ 35 * tdep
->wordsize
);
559 trad_frame_set_reg_addr (this_cache
, tdep
->ppc_lr_regnum
,
560 gpregs
+ 36 * tdep
->wordsize
);
561 trad_frame_set_reg_addr (this_cache
, tdep
->ppc_xer_regnum
,
562 gpregs
+ 37 * tdep
->wordsize
);
563 trad_frame_set_reg_addr (this_cache
, tdep
->ppc_cr_regnum
,
564 gpregs
+ 38 * tdep
->wordsize
);
566 if (ppc_linux_trap_reg_p (gdbarch
))
568 trad_frame_set_reg_addr (this_cache
, PPC_ORIG_R3_REGNUM
,
569 gpregs
+ 34 * tdep
->wordsize
);
570 trad_frame_set_reg_addr (this_cache
, PPC_TRAP_REGNUM
,
571 gpregs
+ 40 * tdep
->wordsize
);
574 if (ppc_floating_point_unit_p (gdbarch
))
576 /* Floating point registers. */
577 for (i
= 0; i
< 32; i
++)
579 int regnum
= i
+ gdbarch_fp0_regnum (gdbarch
);
580 trad_frame_set_reg_addr (this_cache
, regnum
,
581 fpregs
+ i
* tdep
->wordsize
);
583 trad_frame_set_reg_addr (this_cache
, tdep
->ppc_fpscr_regnum
,
584 fpregs
+ 32 * tdep
->wordsize
);
586 trad_frame_set_id (this_cache
, frame_id_build (base
, func
));
590 ppc32_linux_sigaction_cache_init (const struct tramp_frame
*self
,
591 struct frame_info
*this_frame
,
592 struct trad_frame_cache
*this_cache
,
595 ppc_linux_sigtramp_cache (this_frame
, this_cache
, func
,
596 0xd0 /* Offset to ucontext_t. */
597 + 0x30 /* Offset to .reg. */,
602 ppc64_linux_sigaction_cache_init (const struct tramp_frame
*self
,
603 struct frame_info
*this_frame
,
604 struct trad_frame_cache
*this_cache
,
607 ppc_linux_sigtramp_cache (this_frame
, this_cache
, func
,
608 0x80 /* Offset to ucontext_t. */
609 + 0xe0 /* Offset to .reg. */,
614 ppc32_linux_sighandler_cache_init (const struct tramp_frame
*self
,
615 struct frame_info
*this_frame
,
616 struct trad_frame_cache
*this_cache
,
619 ppc_linux_sigtramp_cache (this_frame
, this_cache
, func
,
620 0x40 /* Offset to ucontext_t. */
621 + 0x1c /* Offset to .reg. */,
626 ppc64_linux_sighandler_cache_init (const struct tramp_frame
*self
,
627 struct frame_info
*this_frame
,
628 struct trad_frame_cache
*this_cache
,
631 ppc_linux_sigtramp_cache (this_frame
, this_cache
, func
,
632 0x80 /* Offset to struct sigcontext. */
633 + 0x38 /* Offset to .reg. */,
637 static struct tramp_frame ppc32_linux_sigaction_tramp_frame
= {
641 { 0x380000ac, -1 }, /* li r0, 172 */
642 { 0x44000002, -1 }, /* sc */
643 { TRAMP_SENTINEL_INSN
},
645 ppc32_linux_sigaction_cache_init
647 static struct tramp_frame ppc64_linux_sigaction_tramp_frame
= {
651 { 0x38210080, -1 }, /* addi r1,r1,128 */
652 { 0x380000ac, -1 }, /* li r0, 172 */
653 { 0x44000002, -1 }, /* sc */
654 { TRAMP_SENTINEL_INSN
},
656 ppc64_linux_sigaction_cache_init
658 static struct tramp_frame ppc32_linux_sighandler_tramp_frame
= {
662 { 0x38000077, -1 }, /* li r0,119 */
663 { 0x44000002, -1 }, /* sc */
664 { TRAMP_SENTINEL_INSN
},
666 ppc32_linux_sighandler_cache_init
668 static struct tramp_frame ppc64_linux_sighandler_tramp_frame
= {
672 { 0x38210080, -1 }, /* addi r1,r1,128 */
673 { 0x38000077, -1 }, /* li r0,119 */
674 { 0x44000002, -1 }, /* sc */
675 { TRAMP_SENTINEL_INSN
},
677 ppc64_linux_sighandler_cache_init
681 /* Address to use for displaced stepping. When debugging a stand-alone
682 SPU executable, entry_point_address () will point to an SPU local-store
683 address and is thus not usable as displaced stepping location. We use
684 the auxiliary vector to determine the PowerPC-side entry point address
687 static CORE_ADDR ppc_linux_entry_point_addr
= 0;
690 ppc_linux_inferior_created (struct target_ops
*target
, int from_tty
)
692 ppc_linux_entry_point_addr
= 0;
696 ppc_linux_displaced_step_location (struct gdbarch
*gdbarch
)
698 if (ppc_linux_entry_point_addr
== 0)
702 /* Determine entry point from target auxiliary vector. */
703 if (target_auxv_search (¤t_target
, AT_ENTRY
, &addr
) <= 0)
704 error (_("Cannot find AT_ENTRY auxiliary vector entry."));
706 /* Make certain that the address points at real code, and not a
707 function descriptor. */
708 addr
= gdbarch_convert_from_func_ptr_addr (gdbarch
, addr
,
711 /* Inferior calls also use the entry point as a breakpoint location.
712 We don't want displaced stepping to interfere with those
713 breakpoints, so leave space. */
714 ppc_linux_entry_point_addr
= addr
+ 2 * PPC_INSN_SIZE
;
717 return ppc_linux_entry_point_addr
;
721 /* Return 1 if PPC_ORIG_R3_REGNUM and PPC_TRAP_REGNUM are usable. */
723 ppc_linux_trap_reg_p (struct gdbarch
*gdbarch
)
725 /* If we do not have a target description with registers, then
726 the special registers will not be included in the register set. */
727 if (!tdesc_has_registers (gdbarch_target_desc (gdbarch
)))
730 /* If we do, then it is safe to check the size. */
731 return register_size (gdbarch
, PPC_ORIG_R3_REGNUM
) > 0
732 && register_size (gdbarch
, PPC_TRAP_REGNUM
) > 0;
735 /* Return the current system call's number present in the
736 r0 register. When the function fails, it returns -1. */
738 ppc_linux_get_syscall_number (struct gdbarch
*gdbarch
,
741 struct regcache
*regcache
= get_thread_regcache (ptid
);
742 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
743 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
744 struct cleanup
*cleanbuf
;
745 /* The content of a register */
750 /* Make sure we're in a 32- or 64-bit machine */
751 gdb_assert (tdep
->wordsize
== 4 || tdep
->wordsize
== 8);
753 buf
= (gdb_byte
*) xmalloc (tdep
->wordsize
* sizeof (gdb_byte
));
755 cleanbuf
= make_cleanup (xfree
, buf
);
757 /* Getting the system call number from the register.
758 When dealing with PowerPC architecture, this information
759 is stored at 0th register. */
760 regcache_cooked_read (regcache
, tdep
->ppc_gp0_regnum
, buf
);
762 ret
= extract_signed_integer (buf
, tdep
->wordsize
, byte_order
);
763 do_cleanups (cleanbuf
);
769 ppc_linux_write_pc (struct regcache
*regcache
, CORE_ADDR pc
)
771 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
773 regcache_cooked_write_unsigned (regcache
, gdbarch_pc_regnum (gdbarch
), pc
);
775 /* Set special TRAP register to -1 to prevent the kernel from
776 messing with the PC we just installed, if we happen to be
777 within an interrupted system call that the kernel wants to
780 Note that after we return from the dummy call, the TRAP and
781 ORIG_R3 registers will be automatically restored, and the
782 kernel continues to restart the system call at this point. */
783 if (ppc_linux_trap_reg_p (gdbarch
))
784 regcache_cooked_write_unsigned (regcache
, PPC_TRAP_REGNUM
, -1);
788 ppc_linux_spu_section (bfd
*abfd
, asection
*asect
, void *user_data
)
790 return strncmp (bfd_section_name (abfd
, asect
), "SPU/", 4) == 0;
793 static const struct target_desc
*
794 ppc_linux_core_read_description (struct gdbarch
*gdbarch
,
795 struct target_ops
*target
,
798 asection
*cell
= bfd_sections_find_if (abfd
, ppc_linux_spu_section
, NULL
);
799 asection
*altivec
= bfd_get_section_by_name (abfd
, ".reg-ppc-vmx");
800 asection
*vsx
= bfd_get_section_by_name (abfd
, ".reg-ppc-vsx");
801 asection
*section
= bfd_get_section_by_name (abfd
, ".reg");
805 switch (bfd_section_size (abfd
, section
))
809 return tdesc_powerpc_cell32l
;
811 return tdesc_powerpc_vsx32l
;
813 return tdesc_powerpc_altivec32l
;
815 return tdesc_powerpc_32l
;
819 return tdesc_powerpc_cell64l
;
821 return tdesc_powerpc_vsx64l
;
823 return tdesc_powerpc_altivec64l
;
825 return tdesc_powerpc_64l
;
833 /* Implementation of `gdbarch_elf_make_msymbol_special', as defined in
834 gdbarch.h. This implementation is used for the ELFv2 ABI only. */
837 ppc_elfv2_elf_make_msymbol_special (asymbol
*sym
, struct minimal_symbol
*msym
)
839 elf_symbol_type
*elf_sym
= (elf_symbol_type
*)sym
;
841 /* If the symbol is marked as having a local entry point, set a target
842 flag in the msymbol. We currently only support local entry point
843 offsets of 8 bytes, which is the only entry point offset ever used
844 by current compilers. If/when other offsets are ever used, we will
845 have to use additional target flag bits to store them. */
846 switch (PPC64_LOCAL_ENTRY_OFFSET (elf_sym
->internal_elf_sym
.st_other
))
851 MSYMBOL_TARGET_FLAG_1 (msym
) = 1;
856 /* Implementation of `gdbarch_skip_entrypoint', as defined in
857 gdbarch.h. This implementation is used for the ELFv2 ABI only. */
860 ppc_elfv2_skip_entrypoint (struct gdbarch
*gdbarch
, CORE_ADDR pc
)
862 struct bound_minimal_symbol fun
;
863 int local_entry_offset
= 0;
865 fun
= lookup_minimal_symbol_by_pc (pc
);
866 if (fun
.minsym
== NULL
)
869 /* See ppc_elfv2_elf_make_msymbol_special for how local entry point
870 offset values are encoded. */
871 if (MSYMBOL_TARGET_FLAG_1 (fun
.minsym
))
872 local_entry_offset
= 8;
874 if (BMSYMBOL_VALUE_ADDRESS (fun
) <= pc
875 && pc
< BMSYMBOL_VALUE_ADDRESS (fun
) + local_entry_offset
)
876 return BMSYMBOL_VALUE_ADDRESS (fun
) + local_entry_offset
;
881 /* Implementation of `gdbarch_stap_is_single_operand', as defined in
885 ppc_stap_is_single_operand (struct gdbarch
*gdbarch
, const char *s
)
887 return (*s
== 'i' /* Literal number. */
888 || (isdigit (*s
) && s
[1] == '('
889 && isdigit (s
[2])) /* Displacement. */
890 || (*s
== '(' && isdigit (s
[1])) /* Register indirection. */
891 || isdigit (*s
)); /* Register value. */
894 /* Implementation of `gdbarch_stap_parse_special_token', as defined in
898 ppc_stap_parse_special_token (struct gdbarch
*gdbarch
,
899 struct stap_parse_info
*p
)
901 if (isdigit (*p
->arg
))
903 /* This temporary pointer is needed because we have to do a lookahead.
904 We could be dealing with a register displacement, and in such case
905 we would not need to do anything. */
906 const char *s
= p
->arg
;
916 /* It is a register displacement indeed. Returning 0 means we are
917 deferring the treatment of this case to the generic parser. */
922 regname
= alloca (len
+ 2);
925 strncpy (regname
+ 1, p
->arg
, len
);
929 if (user_reg_map_name_to_regnum (gdbarch
, regname
, len
) == -1)
930 error (_("Invalid register name `%s' on expression `%s'."),
931 regname
, p
->saved_arg
);
933 write_exp_elt_opcode (&p
->pstate
, OP_REGISTER
);
936 write_exp_string (&p
->pstate
, str
);
937 write_exp_elt_opcode (&p
->pstate
, OP_REGISTER
);
943 /* All the other tokens should be handled correctly by the generic
951 /* Cell/B.E. active SPE context tracking support. */
953 static struct objfile
*spe_context_objfile
= NULL
;
954 static CORE_ADDR spe_context_lm_addr
= 0;
955 static CORE_ADDR spe_context_offset
= 0;
957 static ptid_t spe_context_cache_ptid
;
958 static CORE_ADDR spe_context_cache_address
;
960 /* Hook into inferior_created, solib_loaded, and solib_unloaded observers
961 to track whether we've loaded a version of libspe2 (as static or dynamic
962 library) that provides the __spe_current_active_context variable. */
964 ppc_linux_spe_context_lookup (struct objfile
*objfile
)
966 struct bound_minimal_symbol sym
;
970 spe_context_objfile
= NULL
;
971 spe_context_lm_addr
= 0;
972 spe_context_offset
= 0;
973 spe_context_cache_ptid
= minus_one_ptid
;
974 spe_context_cache_address
= 0;
978 sym
= lookup_minimal_symbol ("__spe_current_active_context", NULL
, objfile
);
981 spe_context_objfile
= objfile
;
982 spe_context_lm_addr
= svr4_fetch_objfile_link_map (objfile
);
983 spe_context_offset
= BMSYMBOL_VALUE_ADDRESS (sym
);
984 spe_context_cache_ptid
= minus_one_ptid
;
985 spe_context_cache_address
= 0;
991 ppc_linux_spe_context_inferior_created (struct target_ops
*t
, int from_tty
)
993 struct objfile
*objfile
;
995 ppc_linux_spe_context_lookup (NULL
);
996 ALL_OBJFILES (objfile
)
997 ppc_linux_spe_context_lookup (objfile
);
1001 ppc_linux_spe_context_solib_loaded (struct so_list
*so
)
1003 if (strstr (so
->so_original_name
, "/libspe") != NULL
)
1005 solib_read_symbols (so
, 0);
1006 ppc_linux_spe_context_lookup (so
->objfile
);
1011 ppc_linux_spe_context_solib_unloaded (struct so_list
*so
)
1013 if (so
->objfile
== spe_context_objfile
)
1014 ppc_linux_spe_context_lookup (NULL
);
1017 /* Retrieve contents of the N'th element in the current thread's
1018 linked SPE context list into ID and NPC. Return the address of
1019 said context element, or 0 if not found. */
1021 ppc_linux_spe_context (int wordsize
, enum bfd_endian byte_order
,
1022 int n
, int *id
, unsigned int *npc
)
1024 CORE_ADDR spe_context
= 0;
1028 /* Quick exit if we have not found __spe_current_active_context. */
1029 if (!spe_context_objfile
)
1032 /* Look up cached address of thread-local variable. */
1033 if (!ptid_equal (spe_context_cache_ptid
, inferior_ptid
))
1035 struct target_ops
*target
= ¤t_target
;
1036 volatile struct gdb_exception ex
;
1038 TRY_CATCH (ex
, RETURN_MASK_ERROR
)
1040 /* We do not call target_translate_tls_address here, because
1041 svr4_fetch_objfile_link_map may invalidate the frame chain,
1042 which must not do while inside a frame sniffer.
1044 Instead, we have cached the lm_addr value, and use that to
1045 directly call the target's to_get_thread_local_address. */
1046 spe_context_cache_address
1047 = target
->to_get_thread_local_address (target
, inferior_ptid
,
1048 spe_context_lm_addr
,
1049 spe_context_offset
);
1050 spe_context_cache_ptid
= inferior_ptid
;
1057 /* Read variable value. */
1058 if (target_read_memory (spe_context_cache_address
, buf
, wordsize
) == 0)
1059 spe_context
= extract_unsigned_integer (buf
, wordsize
, byte_order
);
1061 /* Cyle through to N'th linked list element. */
1062 for (i
= 0; i
< n
&& spe_context
; i
++)
1063 if (target_read_memory (spe_context
+ align_up (12, wordsize
),
1064 buf
, wordsize
) == 0)
1065 spe_context
= extract_unsigned_integer (buf
, wordsize
, byte_order
);
1069 /* Read current context. */
1071 && target_read_memory (spe_context
, buf
, 12) != 0)
1074 /* Extract data elements. */
1078 *id
= extract_signed_integer (buf
, 4, byte_order
);
1080 *npc
= extract_unsigned_integer (buf
+ 4, 4, byte_order
);
1087 /* Cell/B.E. cross-architecture unwinder support. */
1089 struct ppu2spu_cache
1091 struct frame_id frame_id
;
1092 struct regcache
*regcache
;
1095 static struct gdbarch
*
1096 ppu2spu_prev_arch (struct frame_info
*this_frame
, void **this_cache
)
1098 struct ppu2spu_cache
*cache
= *this_cache
;
1099 return get_regcache_arch (cache
->regcache
);
1103 ppu2spu_this_id (struct frame_info
*this_frame
,
1104 void **this_cache
, struct frame_id
*this_id
)
1106 struct ppu2spu_cache
*cache
= *this_cache
;
1107 *this_id
= cache
->frame_id
;
1110 static struct value
*
1111 ppu2spu_prev_register (struct frame_info
*this_frame
,
1112 void **this_cache
, int regnum
)
1114 struct ppu2spu_cache
*cache
= *this_cache
;
1115 struct gdbarch
*gdbarch
= get_regcache_arch (cache
->regcache
);
1118 buf
= alloca (register_size (gdbarch
, regnum
));
1120 if (regnum
< gdbarch_num_regs (gdbarch
))
1121 regcache_raw_read (cache
->regcache
, regnum
, buf
);
1123 gdbarch_pseudo_register_read (gdbarch
, cache
->regcache
, regnum
, buf
);
1125 return frame_unwind_got_bytes (this_frame
, regnum
, buf
);
1130 struct gdbarch
*gdbarch
;
1133 gdb_byte gprs
[128*16];
1137 ppu2spu_unwind_register (void *src
, int regnum
, gdb_byte
*buf
)
1139 struct ppu2spu_data
*data
= src
;
1140 enum bfd_endian byte_order
= gdbarch_byte_order (data
->gdbarch
);
1142 if (regnum
>= 0 && regnum
< SPU_NUM_GPRS
)
1143 memcpy (buf
, data
->gprs
+ 16*regnum
, 16);
1144 else if (regnum
== SPU_ID_REGNUM
)
1145 store_unsigned_integer (buf
, 4, byte_order
, data
->id
);
1146 else if (regnum
== SPU_PC_REGNUM
)
1147 store_unsigned_integer (buf
, 4, byte_order
, data
->npc
);
1149 return REG_UNAVAILABLE
;
1155 ppu2spu_sniffer (const struct frame_unwind
*self
,
1156 struct frame_info
*this_frame
, void **this_prologue_cache
)
1158 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
1159 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
1160 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
1161 struct ppu2spu_data data
;
1162 struct frame_info
*fi
;
1163 CORE_ADDR base
, func
, backchain
, spe_context
;
1167 /* Count the number of SPU contexts already in the frame chain. */
1168 for (fi
= get_next_frame (this_frame
); fi
; fi
= get_next_frame (fi
))
1169 if (get_frame_type (fi
) == ARCH_FRAME
1170 && gdbarch_bfd_arch_info (get_frame_arch (fi
))->arch
== bfd_arch_spu
)
1173 base
= get_frame_sp (this_frame
);
1174 func
= get_frame_pc (this_frame
);
1175 if (target_read_memory (base
, buf
, tdep
->wordsize
))
1177 backchain
= extract_unsigned_integer (buf
, tdep
->wordsize
, byte_order
);
1179 spe_context
= ppc_linux_spe_context (tdep
->wordsize
, byte_order
,
1180 n
, &data
.id
, &data
.npc
);
1181 if (spe_context
&& base
<= spe_context
&& spe_context
< backchain
)
1185 /* Find gdbarch for SPU. */
1186 struct gdbarch_info info
;
1187 gdbarch_info_init (&info
);
1188 info
.bfd_arch_info
= bfd_lookup_arch (bfd_arch_spu
, bfd_mach_spu
);
1189 info
.byte_order
= BFD_ENDIAN_BIG
;
1190 info
.osabi
= GDB_OSABI_LINUX
;
1191 info
.tdep_info
= (void *) &data
.id
;
1192 data
.gdbarch
= gdbarch_find_by_info (info
);
1196 xsnprintf (annex
, sizeof annex
, "%d/regs", data
.id
);
1197 if (target_read (¤t_target
, TARGET_OBJECT_SPU
, annex
,
1198 data
.gprs
, 0, sizeof data
.gprs
)
1199 == sizeof data
.gprs
)
1201 struct ppu2spu_cache
*cache
1202 = FRAME_OBSTACK_CALLOC (1, struct ppu2spu_cache
);
1204 struct address_space
*aspace
= get_frame_address_space (this_frame
);
1205 struct regcache
*regcache
= regcache_xmalloc (data
.gdbarch
, aspace
);
1206 struct cleanup
*cleanups
= make_cleanup_regcache_xfree (regcache
);
1207 regcache_save (regcache
, ppu2spu_unwind_register
, &data
);
1208 discard_cleanups (cleanups
);
1210 cache
->frame_id
= frame_id_build (base
, func
);
1211 cache
->regcache
= regcache
;
1212 *this_prologue_cache
= cache
;
1221 ppu2spu_dealloc_cache (struct frame_info
*self
, void *this_cache
)
1223 struct ppu2spu_cache
*cache
= this_cache
;
1224 regcache_xfree (cache
->regcache
);
1227 static const struct frame_unwind ppu2spu_unwind
= {
1229 default_frame_unwind_stop_reason
,
1231 ppu2spu_prev_register
,
1234 ppu2spu_dealloc_cache
,
1240 ppc_linux_init_abi (struct gdbarch_info info
,
1241 struct gdbarch
*gdbarch
)
1243 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
1244 struct tdesc_arch_data
*tdesc_data
= (void *) info
.tdep_info
;
1245 static const char *const stap_integer_prefixes
[] = { "i", NULL
};
1246 static const char *const stap_register_indirection_prefixes
[] = { "(",
1248 static const char *const stap_register_indirection_suffixes
[] = { ")",
1251 linux_init_abi (info
, gdbarch
);
1253 /* PPC GNU/Linux uses either 64-bit or 128-bit long doubles; where
1254 128-bit, they are IBM long double, not IEEE quad long double as
1255 in the System V ABI PowerPC Processor Supplement. We can safely
1256 let them default to 128-bit, since the debug info will give the
1257 size of type actually used in each case. */
1258 set_gdbarch_long_double_bit (gdbarch
, 16 * TARGET_CHAR_BIT
);
1259 set_gdbarch_long_double_format (gdbarch
, floatformats_ibm_long_double
);
1261 /* Handle inferior calls during interrupted system calls. */
1262 set_gdbarch_write_pc (gdbarch
, ppc_linux_write_pc
);
1264 /* Get the syscall number from the arch's register. */
1265 set_gdbarch_get_syscall_number (gdbarch
, ppc_linux_get_syscall_number
);
1267 /* SystemTap functions. */
1268 set_gdbarch_stap_integer_prefixes (gdbarch
, stap_integer_prefixes
);
1269 set_gdbarch_stap_register_indirection_prefixes (gdbarch
,
1270 stap_register_indirection_prefixes
);
1271 set_gdbarch_stap_register_indirection_suffixes (gdbarch
,
1272 stap_register_indirection_suffixes
);
1273 set_gdbarch_stap_gdb_register_prefix (gdbarch
, "r");
1274 set_gdbarch_stap_is_single_operand (gdbarch
, ppc_stap_is_single_operand
);
1275 set_gdbarch_stap_parse_special_token (gdbarch
,
1276 ppc_stap_parse_special_token
);
1278 if (tdep
->wordsize
== 4)
1280 /* Until November 2001, gcc did not comply with the 32 bit SysV
1281 R4 ABI requirement that structures less than or equal to 8
1282 bytes should be returned in registers. Instead GCC was using
1283 the AIX/PowerOpen ABI - everything returned in memory
1284 (well ignoring vectors that is). When this was corrected, it
1285 wasn't fixed for GNU/Linux native platform. Use the
1286 PowerOpen struct convention. */
1287 set_gdbarch_return_value (gdbarch
, ppc_linux_return_value
);
1289 set_gdbarch_memory_remove_breakpoint (gdbarch
,
1290 ppc_linux_memory_remove_breakpoint
);
1292 /* Shared library handling. */
1293 set_gdbarch_skip_trampoline_code (gdbarch
, ppc_skip_trampoline_code
);
1294 set_solib_svr4_fetch_link_map_offsets
1295 (gdbarch
, svr4_ilp32_fetch_link_map_offsets
);
1297 /* Setting the correct XML syscall filename. */
1298 set_xml_syscall_file_name (XML_SYSCALL_FILENAME_PPC
);
1301 tramp_frame_prepend_unwinder (gdbarch
,
1302 &ppc32_linux_sigaction_tramp_frame
);
1303 tramp_frame_prepend_unwinder (gdbarch
,
1304 &ppc32_linux_sighandler_tramp_frame
);
1306 /* BFD target for core files. */
1307 if (gdbarch_byte_order (gdbarch
) == BFD_ENDIAN_LITTLE
)
1308 set_gdbarch_gcore_bfd_target (gdbarch
, "elf32-powerpcle");
1310 set_gdbarch_gcore_bfd_target (gdbarch
, "elf32-powerpc");
1312 if (powerpc_so_ops
.in_dynsym_resolve_code
== NULL
)
1314 powerpc_so_ops
= svr4_so_ops
;
1315 /* Override dynamic resolve function. */
1316 powerpc_so_ops
.in_dynsym_resolve_code
=
1317 powerpc_linux_in_dynsym_resolve_code
;
1319 set_solib_ops (gdbarch
, &powerpc_so_ops
);
1321 set_gdbarch_skip_solib_resolver (gdbarch
, glibc_skip_solib_resolver
);
1324 if (tdep
->wordsize
== 8)
1326 if (tdep
->elf_abi
== POWERPC_ELF_V1
)
1328 /* Handle PPC GNU/Linux 64-bit function pointers (which are really
1329 function descriptors). */
1330 set_gdbarch_convert_from_func_ptr_addr
1331 (gdbarch
, ppc64_convert_from_func_ptr_addr
);
1333 set_gdbarch_elf_make_msymbol_special
1334 (gdbarch
, ppc64_elf_make_msymbol_special
);
1338 set_gdbarch_elf_make_msymbol_special
1339 (gdbarch
, ppc_elfv2_elf_make_msymbol_special
);
1341 set_gdbarch_skip_entrypoint (gdbarch
, ppc_elfv2_skip_entrypoint
);
1344 /* Shared library handling. */
1345 set_gdbarch_skip_trampoline_code (gdbarch
, ppc64_skip_trampoline_code
);
1346 set_solib_svr4_fetch_link_map_offsets
1347 (gdbarch
, svr4_lp64_fetch_link_map_offsets
);
1349 /* Setting the correct XML syscall filename. */
1350 set_xml_syscall_file_name (XML_SYSCALL_FILENAME_PPC64
);
1353 tramp_frame_prepend_unwinder (gdbarch
,
1354 &ppc64_linux_sigaction_tramp_frame
);
1355 tramp_frame_prepend_unwinder (gdbarch
,
1356 &ppc64_linux_sighandler_tramp_frame
);
1358 /* BFD target for core files. */
1359 if (gdbarch_byte_order (gdbarch
) == BFD_ENDIAN_LITTLE
)
1360 set_gdbarch_gcore_bfd_target (gdbarch
, "elf64-powerpcle");
1362 set_gdbarch_gcore_bfd_target (gdbarch
, "elf64-powerpc");
1365 /* PPC32 uses a different prpsinfo32 compared to most other Linux
1367 if (tdep
->wordsize
== 4)
1368 set_gdbarch_elfcore_write_linux_prpsinfo (gdbarch
,
1369 elfcore_write_ppc_linux_prpsinfo32
);
1371 set_gdbarch_core_read_description (gdbarch
, ppc_linux_core_read_description
);
1372 set_gdbarch_iterate_over_regset_sections (gdbarch
,
1373 ppc_linux_iterate_over_regset_sections
);
1375 /* Enable TLS support. */
1376 set_gdbarch_fetch_tls_load_module_address (gdbarch
,
1377 svr4_fetch_objfile_link_map
);
1381 const struct tdesc_feature
*feature
;
1383 /* If we have target-described registers, then we can safely
1384 reserve a number for PPC_ORIG_R3_REGNUM and PPC_TRAP_REGNUM
1385 (whether they are described or not). */
1386 gdb_assert (gdbarch_num_regs (gdbarch
) <= PPC_ORIG_R3_REGNUM
);
1387 set_gdbarch_num_regs (gdbarch
, PPC_TRAP_REGNUM
+ 1);
1389 /* If they are present, then assign them to the reserved number. */
1390 feature
= tdesc_find_feature (info
.target_desc
,
1391 "org.gnu.gdb.power.linux");
1392 if (feature
!= NULL
)
1394 tdesc_numbered_register (feature
, tdesc_data
,
1395 PPC_ORIG_R3_REGNUM
, "orig_r3");
1396 tdesc_numbered_register (feature
, tdesc_data
,
1397 PPC_TRAP_REGNUM
, "trap");
1401 /* Enable Cell/B.E. if supported by the target. */
1402 if (tdesc_compatible_p (info
.target_desc
,
1403 bfd_lookup_arch (bfd_arch_spu
, bfd_mach_spu
)))
1405 /* Cell/B.E. multi-architecture support. */
1406 set_spu_solib_ops (gdbarch
);
1408 /* Cell/B.E. cross-architecture unwinder support. */
1409 frame_unwind_prepend_unwinder (gdbarch
, &ppu2spu_unwind
);
1411 /* The default displaced_step_at_entry_point doesn't work for
1412 SPU stand-alone executables. */
1413 set_gdbarch_displaced_step_location (gdbarch
,
1414 ppc_linux_displaced_step_location
);
1417 set_gdbarch_get_siginfo_type (gdbarch
, linux_get_siginfo_type
);
1420 /* Provide a prototype to silence -Wmissing-prototypes. */
1421 extern initialize_file_ftype _initialize_ppc_linux_tdep
;
1424 _initialize_ppc_linux_tdep (void)
1426 /* Register for all sub-familes of the POWER/PowerPC: 32-bit and
1427 64-bit PowerPC, and the older rs6k. */
1428 gdbarch_register_osabi (bfd_arch_powerpc
, bfd_mach_ppc
, GDB_OSABI_LINUX
,
1429 ppc_linux_init_abi
);
1430 gdbarch_register_osabi (bfd_arch_powerpc
, bfd_mach_ppc64
, GDB_OSABI_LINUX
,
1431 ppc_linux_init_abi
);
1432 gdbarch_register_osabi (bfd_arch_rs6000
, bfd_mach_rs6k
, GDB_OSABI_LINUX
,
1433 ppc_linux_init_abi
);
1435 /* Attach to inferior_created observer. */
1436 observer_attach_inferior_created (ppc_linux_inferior_created
);
1438 /* Attach to observers to track __spe_current_active_context. */
1439 observer_attach_inferior_created (ppc_linux_spe_context_inferior_created
);
1440 observer_attach_solib_loaded (ppc_linux_spe_context_solib_loaded
);
1441 observer_attach_solib_unloaded (ppc_linux_spe_context_solib_unloaded
);
1443 /* Initialize the Linux target descriptions. */
1444 initialize_tdesc_powerpc_32l ();
1445 initialize_tdesc_powerpc_altivec32l ();
1446 initialize_tdesc_powerpc_cell32l ();
1447 initialize_tdesc_powerpc_vsx32l ();
1448 initialize_tdesc_powerpc_isa205_32l ();
1449 initialize_tdesc_powerpc_isa205_altivec32l ();
1450 initialize_tdesc_powerpc_isa205_vsx32l ();
1451 initialize_tdesc_powerpc_64l ();
1452 initialize_tdesc_powerpc_altivec64l ();
1453 initialize_tdesc_powerpc_cell64l ();
1454 initialize_tdesc_powerpc_vsx64l ();
1455 initialize_tdesc_powerpc_isa205_64l ();
1456 initialize_tdesc_powerpc_isa205_altivec64l ();
1457 initialize_tdesc_powerpc_isa205_vsx64l ();
1458 initialize_tdesc_powerpc_e500l ();