1 /* GNU/Linux on ARM target support.
3 Copyright (C) 1999-2016 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/>. */
24 #include "floatformat.h"
29 #include "solib-svr4.h"
32 #include "trad-frame.h"
33 #include "tramp-frame.h"
34 #include "breakpoint.h"
36 #include "xml-syscall.h"
39 #include "arch/arm-get-next-pcs.h"
40 #include "arch/arm-linux.h"
42 #include "arm-linux-tdep.h"
43 #include "linux-tdep.h"
44 #include "glibc-tdep.h"
45 #include "arch-utils.h"
48 #include "gdbthread.h"
51 #include "record-full.h"
52 #include "linux-record.h"
54 #include "cli/cli-utils.h"
55 #include "stap-probe.h"
56 #include "parser-defs.h"
57 #include "user-regs.h"
59 #include "elf/common.h"
60 extern int arm_apcs_32
;
62 /* Under ARM GNU/Linux the traditional way of performing a breakpoint
63 is to execute a particular software interrupt, rather than use a
64 particular undefined instruction to provoke a trap. Upon exection
65 of the software interrupt the kernel stops the inferior with a
66 SIGTRAP, and wakes the debugger. */
68 static const gdb_byte arm_linux_arm_le_breakpoint
[] = { 0x01, 0x00, 0x9f, 0xef };
70 static const gdb_byte arm_linux_arm_be_breakpoint
[] = { 0xef, 0x9f, 0x00, 0x01 };
72 /* However, the EABI syscall interface (new in Nov. 2005) does not look at
73 the operand of the swi if old-ABI compatibility is disabled. Therefore,
74 use an undefined instruction instead. This is supported as of kernel
75 version 2.5.70 (May 2003), so should be a safe assumption for EABI
78 static const gdb_byte eabi_linux_arm_le_breakpoint
[] = { 0xf0, 0x01, 0xf0, 0xe7 };
80 static const gdb_byte eabi_linux_arm_be_breakpoint
[] = { 0xe7, 0xf0, 0x01, 0xf0 };
82 /* All the kernels which support Thumb support using a specific undefined
83 instruction for the Thumb breakpoint. */
85 static const gdb_byte arm_linux_thumb_be_breakpoint
[] = {0xde, 0x01};
87 static const gdb_byte arm_linux_thumb_le_breakpoint
[] = {0x01, 0xde};
89 /* Because the 16-bit Thumb breakpoint is affected by Thumb-2 IT blocks,
90 we must use a length-appropriate breakpoint for 32-bit Thumb
91 instructions. See also thumb_get_next_pc. */
93 static const gdb_byte arm_linux_thumb2_be_breakpoint
[] = { 0xf7, 0xf0, 0xa0, 0x00 };
95 static const gdb_byte arm_linux_thumb2_le_breakpoint
[] = { 0xf0, 0xf7, 0x00, 0xa0 };
97 /* Description of the longjmp buffer. The buffer is treated as an array of
98 elements of size ARM_LINUX_JB_ELEMENT_SIZE.
100 The location of saved registers in this buffer (in particular the PC
101 to use after longjmp is called) varies depending on the ABI (in
102 particular the FP model) and also (possibly) the C Library.
104 For glibc, eglibc, and uclibc the following holds: If the FP model is
105 SoftVFP or VFP (which implies EABI) then the PC is at offset 9 in the
106 buffer. This is also true for the SoftFPA model. However, for the FPA
107 model the PC is at offset 21 in the buffer. */
108 #define ARM_LINUX_JB_ELEMENT_SIZE INT_REGISTER_SIZE
109 #define ARM_LINUX_JB_PC_FPA 21
110 #define ARM_LINUX_JB_PC_EABI 9
113 Dynamic Linking on ARM GNU/Linux
114 --------------------------------
116 Note: PLT = procedure linkage table
117 GOT = global offset table
119 As much as possible, ELF dynamic linking defers the resolution of
120 jump/call addresses until the last minute. The technique used is
121 inspired by the i386 ELF design, and is based on the following
124 1) The calling technique should not force a change in the assembly
125 code produced for apps; it MAY cause changes in the way assembly
126 code is produced for position independent code (i.e. shared
129 2) The technique must be such that all executable areas must not be
130 modified; and any modified areas must not be executed.
132 To do this, there are three steps involved in a typical jump:
136 3) using a pointer from the GOT
138 When the executable or library is first loaded, each GOT entry is
139 initialized to point to the code which implements dynamic name
140 resolution and code finding. This is normally a function in the
141 program interpreter (on ARM GNU/Linux this is usually
142 ld-linux.so.2, but it does not have to be). On the first
143 invocation, the function is located and the GOT entry is replaced
144 with the real function address. Subsequent calls go through steps
145 1, 2 and 3 and end up calling the real code.
152 This is typical ARM code using the 26 bit relative branch or branch
153 and link instructions. The target of the instruction
154 (function_call is usually the address of the function to be called.
155 In position independent code, the target of the instruction is
156 actually an entry in the PLT when calling functions in a shared
157 library. Note that this call is identical to a normal function
158 call, only the target differs.
162 The PLT is a synthetic area, created by the linker. It exists in
163 both executables and libraries. It is an array of stubs, one per
164 imported function call. It looks like this:
167 str lr, [sp, #-4]! @push the return address (lr)
168 ldr lr, [pc, #16] @load from 6 words ahead
169 add lr, pc, lr @form an address for GOT[0]
170 ldr pc, [lr, #8]! @jump to the contents of that addr
172 The return address (lr) is pushed on the stack and used for
173 calculations. The load on the second line loads the lr with
174 &GOT[3] - . - 20. The addition on the third leaves:
176 lr = (&GOT[3] - . - 20) + (. + 8)
180 On the fourth line, the pc and lr are both updated, so that:
186 NOTE: PLT[0] borrows an offset .word from PLT[1]. This is a little
187 "tight", but allows us to keep all the PLT entries the same size.
190 ldr ip, [pc, #4] @load offset from gotoff
191 add ip, pc, ip @add the offset to the pc
192 ldr pc, [ip] @jump to that address
193 gotoff: .word GOT[n+3] - .
195 The load on the first line, gets an offset from the fourth word of
196 the PLT entry. The add on the second line makes ip = &GOT[n+3],
197 which contains either a pointer to PLT[0] (the fixup trampoline) or
198 a pointer to the actual code.
202 The GOT contains helper pointers for both code (PLT) fixups and
203 data fixups. The first 3 entries of the GOT are special. The next
204 M entries (where M is the number of entries in the PLT) belong to
205 the PLT fixups. The next D (all remaining) entries belong to
206 various data fixups. The actual size of the GOT is 3 + M + D.
208 The GOT is also a synthetic area, created by the linker. It exists
209 in both executables and libraries. When the GOT is first
210 initialized , all the GOT entries relating to PLT fixups are
211 pointing to code back at PLT[0].
213 The special entries in the GOT are:
215 GOT[0] = linked list pointer used by the dynamic loader
216 GOT[1] = pointer to the reloc table for this module
217 GOT[2] = pointer to the fixup/resolver code
219 The first invocation of function call comes through and uses the
220 fixup/resolver code. On the entry to the fixup/resolver code:
224 stack[0] = return address (lr) of the function call
225 [r0, r1, r2, r3] are still the arguments to the function call
227 This is enough information for the fixup/resolver code to work
228 with. Before the fixup/resolver code returns, it actually calls
229 the requested function and repairs &GOT[n+3]. */
231 /* The constants below were determined by examining the following files
232 in the linux kernel sources:
234 arch/arm/kernel/signal.c
235 - see SWI_SYS_SIGRETURN and SWI_SYS_RT_SIGRETURN
236 include/asm-arm/unistd.h
237 - see __NR_sigreturn, __NR_rt_sigreturn, and __NR_SYSCALL_BASE */
239 #define ARM_LINUX_SIGRETURN_INSTR 0xef900077
240 #define ARM_LINUX_RT_SIGRETURN_INSTR 0xef9000ad
242 /* For ARM EABI, the syscall number is not in the SWI instruction
243 (instead it is loaded into r7). We recognize the pattern that
244 glibc uses... alternatively, we could arrange to do this by
245 function name, but they are not always exported. */
246 #define ARM_SET_R7_SIGRETURN 0xe3a07077
247 #define ARM_SET_R7_RT_SIGRETURN 0xe3a070ad
248 #define ARM_EABI_SYSCALL 0xef000000
250 /* Equivalent patterns for Thumb2. */
251 #define THUMB2_SET_R7_SIGRETURN1 0xf04f
252 #define THUMB2_SET_R7_SIGRETURN2 0x0777
253 #define THUMB2_SET_R7_RT_SIGRETURN1 0xf04f
254 #define THUMB2_SET_R7_RT_SIGRETURN2 0x07ad
255 #define THUMB2_EABI_SYSCALL 0xdf00
257 /* OABI syscall restart trampoline, used for EABI executables too
258 whenever OABI support has been enabled in the kernel. */
259 #define ARM_OABI_SYSCALL_RESTART_SYSCALL 0xef900000
260 #define ARM_LDR_PC_SP_12 0xe49df00c
261 #define ARM_LDR_PC_SP_4 0xe49df004
263 /* Syscall number for sigreturn. */
264 #define ARM_SIGRETURN 119
265 /* Syscall number for rt_sigreturn. */
266 #define ARM_RT_SIGRETURN 173
269 arm_linux_get_next_pcs_syscall_next_pc (struct arm_get_next_pcs
*self
,
272 /* Operation function pointers for get_next_pcs. */
273 static struct arm_get_next_pcs_ops arm_linux_get_next_pcs_ops
= {
274 arm_get_next_pcs_read_memory_unsigned_integer
,
275 arm_linux_get_next_pcs_syscall_next_pc
,
276 arm_get_next_pcs_addr_bits_remove
,
277 arm_get_next_pcs_is_thumb
,
278 arm_linux_get_next_pcs_fixup
,
282 arm_linux_sigtramp_cache (struct frame_info
*this_frame
,
283 struct trad_frame_cache
*this_cache
,
284 CORE_ADDR func
, int regs_offset
)
286 CORE_ADDR sp
= get_frame_register_unsigned (this_frame
, ARM_SP_REGNUM
);
287 CORE_ADDR base
= sp
+ regs_offset
;
290 for (i
= 0; i
< 16; i
++)
291 trad_frame_set_reg_addr (this_cache
, i
, base
+ i
* 4);
293 trad_frame_set_reg_addr (this_cache
, ARM_PS_REGNUM
, base
+ 16 * 4);
295 /* The VFP or iWMMXt registers may be saved on the stack, but there's
296 no reliable way to restore them (yet). */
298 /* Save a frame ID. */
299 trad_frame_set_id (this_cache
, frame_id_build (sp
, func
));
302 /* See arm-linux.h for stack layout details. */
304 arm_linux_sigreturn_init (const struct tramp_frame
*self
,
305 struct frame_info
*this_frame
,
306 struct trad_frame_cache
*this_cache
,
309 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
310 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
311 CORE_ADDR sp
= get_frame_register_unsigned (this_frame
, ARM_SP_REGNUM
);
312 ULONGEST uc_flags
= read_memory_unsigned_integer (sp
, 4, byte_order
);
314 if (uc_flags
== ARM_NEW_SIGFRAME_MAGIC
)
315 arm_linux_sigtramp_cache (this_frame
, this_cache
, func
,
316 ARM_UCONTEXT_SIGCONTEXT
317 + ARM_SIGCONTEXT_R0
);
319 arm_linux_sigtramp_cache (this_frame
, this_cache
, func
,
324 arm_linux_rt_sigreturn_init (const struct tramp_frame
*self
,
325 struct frame_info
*this_frame
,
326 struct trad_frame_cache
*this_cache
,
329 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
330 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
331 CORE_ADDR sp
= get_frame_register_unsigned (this_frame
, ARM_SP_REGNUM
);
332 ULONGEST pinfo
= read_memory_unsigned_integer (sp
, 4, byte_order
);
334 if (pinfo
== sp
+ ARM_OLD_RT_SIGFRAME_SIGINFO
)
335 arm_linux_sigtramp_cache (this_frame
, this_cache
, func
,
336 ARM_OLD_RT_SIGFRAME_UCONTEXT
337 + ARM_UCONTEXT_SIGCONTEXT
338 + ARM_SIGCONTEXT_R0
);
340 arm_linux_sigtramp_cache (this_frame
, this_cache
, func
,
341 ARM_NEW_RT_SIGFRAME_UCONTEXT
342 + ARM_UCONTEXT_SIGCONTEXT
343 + ARM_SIGCONTEXT_R0
);
347 arm_linux_restart_syscall_init (const struct tramp_frame
*self
,
348 struct frame_info
*this_frame
,
349 struct trad_frame_cache
*this_cache
,
352 struct gdbarch
*gdbarch
= get_frame_arch (this_frame
);
353 CORE_ADDR sp
= get_frame_register_unsigned (this_frame
, ARM_SP_REGNUM
);
354 CORE_ADDR pc
= get_frame_memory_unsigned (this_frame
, sp
, 4);
355 CORE_ADDR cpsr
= get_frame_register_unsigned (this_frame
, ARM_PS_REGNUM
);
356 ULONGEST t_bit
= arm_psr_thumb_bit (gdbarch
);
359 /* There are two variants of this trampoline; with older kernels, the
360 stub is placed on the stack, while newer kernels use the stub from
361 the vector page. They are identical except that the older version
362 increments SP by 12 (to skip stored PC and the stub itself), while
363 the newer version increments SP only by 4 (just the stored PC). */
364 if (self
->insn
[1].bytes
== ARM_LDR_PC_SP_4
)
369 /* Update Thumb bit in CPSR. */
375 /* Remove Thumb bit from PC. */
376 pc
= gdbarch_addr_bits_remove (gdbarch
, pc
);
378 /* Save previous register values. */
379 trad_frame_set_reg_value (this_cache
, ARM_SP_REGNUM
, sp
+ sp_offset
);
380 trad_frame_set_reg_value (this_cache
, ARM_PC_REGNUM
, pc
);
381 trad_frame_set_reg_value (this_cache
, ARM_PS_REGNUM
, cpsr
);
383 /* Save a frame ID. */
384 trad_frame_set_id (this_cache
, frame_id_build (sp
, func
));
387 static struct tramp_frame arm_linux_sigreturn_tramp_frame
= {
391 { ARM_LINUX_SIGRETURN_INSTR
, -1 },
392 { TRAMP_SENTINEL_INSN
}
394 arm_linux_sigreturn_init
397 static struct tramp_frame arm_linux_rt_sigreturn_tramp_frame
= {
401 { ARM_LINUX_RT_SIGRETURN_INSTR
, -1 },
402 { TRAMP_SENTINEL_INSN
}
404 arm_linux_rt_sigreturn_init
407 static struct tramp_frame arm_eabi_linux_sigreturn_tramp_frame
= {
411 { ARM_SET_R7_SIGRETURN
, -1 },
412 { ARM_EABI_SYSCALL
, -1 },
413 { TRAMP_SENTINEL_INSN
}
415 arm_linux_sigreturn_init
418 static struct tramp_frame arm_eabi_linux_rt_sigreturn_tramp_frame
= {
422 { ARM_SET_R7_RT_SIGRETURN
, -1 },
423 { ARM_EABI_SYSCALL
, -1 },
424 { TRAMP_SENTINEL_INSN
}
426 arm_linux_rt_sigreturn_init
429 static struct tramp_frame thumb2_eabi_linux_sigreturn_tramp_frame
= {
433 { THUMB2_SET_R7_SIGRETURN1
, -1 },
434 { THUMB2_SET_R7_SIGRETURN2
, -1 },
435 { THUMB2_EABI_SYSCALL
, -1 },
436 { TRAMP_SENTINEL_INSN
}
438 arm_linux_sigreturn_init
441 static struct tramp_frame thumb2_eabi_linux_rt_sigreturn_tramp_frame
= {
445 { THUMB2_SET_R7_RT_SIGRETURN1
, -1 },
446 { THUMB2_SET_R7_RT_SIGRETURN2
, -1 },
447 { THUMB2_EABI_SYSCALL
, -1 },
448 { TRAMP_SENTINEL_INSN
}
450 arm_linux_rt_sigreturn_init
453 static struct tramp_frame arm_linux_restart_syscall_tramp_frame
= {
457 { ARM_OABI_SYSCALL_RESTART_SYSCALL
, -1 },
458 { ARM_LDR_PC_SP_12
, -1 },
459 { TRAMP_SENTINEL_INSN
}
461 arm_linux_restart_syscall_init
464 static struct tramp_frame arm_kernel_linux_restart_syscall_tramp_frame
= {
468 { ARM_OABI_SYSCALL_RESTART_SYSCALL
, -1 },
469 { ARM_LDR_PC_SP_4
, -1 },
470 { TRAMP_SENTINEL_INSN
}
472 arm_linux_restart_syscall_init
475 /* Core file and register set support. */
477 #define ARM_LINUX_SIZEOF_GREGSET (18 * INT_REGISTER_SIZE)
480 arm_linux_supply_gregset (const struct regset
*regset
,
481 struct regcache
*regcache
,
482 int regnum
, const void *gregs_buf
, size_t len
)
484 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
485 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
486 const gdb_byte
*gregs
= (const gdb_byte
*) gregs_buf
;
489 gdb_byte pc_buf
[INT_REGISTER_SIZE
];
491 for (regno
= ARM_A1_REGNUM
; regno
< ARM_PC_REGNUM
; regno
++)
492 if (regnum
== -1 || regnum
== regno
)
493 regcache_raw_supply (regcache
, regno
,
494 gregs
+ INT_REGISTER_SIZE
* regno
);
496 if (regnum
== ARM_PS_REGNUM
|| regnum
== -1)
499 regcache_raw_supply (regcache
, ARM_PS_REGNUM
,
500 gregs
+ INT_REGISTER_SIZE
* ARM_CPSR_GREGNUM
);
502 regcache_raw_supply (regcache
, ARM_PS_REGNUM
,
503 gregs
+ INT_REGISTER_SIZE
* ARM_PC_REGNUM
);
506 if (regnum
== ARM_PC_REGNUM
|| regnum
== -1)
508 reg_pc
= extract_unsigned_integer (gregs
509 + INT_REGISTER_SIZE
* ARM_PC_REGNUM
,
510 INT_REGISTER_SIZE
, byte_order
);
511 reg_pc
= gdbarch_addr_bits_remove (gdbarch
, reg_pc
);
512 store_unsigned_integer (pc_buf
, INT_REGISTER_SIZE
, byte_order
, reg_pc
);
513 regcache_raw_supply (regcache
, ARM_PC_REGNUM
, pc_buf
);
518 arm_linux_collect_gregset (const struct regset
*regset
,
519 const struct regcache
*regcache
,
520 int regnum
, void *gregs_buf
, size_t len
)
522 gdb_byte
*gregs
= (gdb_byte
*) gregs_buf
;
525 for (regno
= ARM_A1_REGNUM
; regno
< ARM_PC_REGNUM
; regno
++)
526 if (regnum
== -1 || regnum
== regno
)
527 regcache_raw_collect (regcache
, regno
,
528 gregs
+ INT_REGISTER_SIZE
* regno
);
530 if (regnum
== ARM_PS_REGNUM
|| regnum
== -1)
533 regcache_raw_collect (regcache
, ARM_PS_REGNUM
,
534 gregs
+ INT_REGISTER_SIZE
* ARM_CPSR_GREGNUM
);
536 regcache_raw_collect (regcache
, ARM_PS_REGNUM
,
537 gregs
+ INT_REGISTER_SIZE
* ARM_PC_REGNUM
);
540 if (regnum
== ARM_PC_REGNUM
|| regnum
== -1)
541 regcache_raw_collect (regcache
, ARM_PC_REGNUM
,
542 gregs
+ INT_REGISTER_SIZE
* ARM_PC_REGNUM
);
545 /* Support for register format used by the NWFPE FPA emulator. */
547 #define typeNone 0x00
548 #define typeSingle 0x01
549 #define typeDouble 0x02
550 #define typeExtended 0x03
553 supply_nwfpe_register (struct regcache
*regcache
, int regno
,
554 const gdb_byte
*regs
)
556 const gdb_byte
*reg_data
;
558 gdb_byte buf
[FP_REGISTER_SIZE
];
560 reg_data
= regs
+ (regno
- ARM_F0_REGNUM
) * FP_REGISTER_SIZE
;
561 reg_tag
= regs
[(regno
- ARM_F0_REGNUM
) + NWFPE_TAGS_OFFSET
];
562 memset (buf
, 0, FP_REGISTER_SIZE
);
567 memcpy (buf
, reg_data
, 4);
570 memcpy (buf
, reg_data
+ 4, 4);
571 memcpy (buf
+ 4, reg_data
, 4);
574 /* We want sign and exponent, then least significant bits,
575 then most significant. NWFPE does sign, most, least. */
576 memcpy (buf
, reg_data
, 4);
577 memcpy (buf
+ 4, reg_data
+ 8, 4);
578 memcpy (buf
+ 8, reg_data
+ 4, 4);
584 regcache_raw_supply (regcache
, regno
, buf
);
588 collect_nwfpe_register (const struct regcache
*regcache
, int regno
,
593 gdb_byte buf
[FP_REGISTER_SIZE
];
595 regcache_raw_collect (regcache
, regno
, buf
);
597 /* NOTE drow/2006-06-07: This code uses the tag already in the
598 register buffer. I've preserved that when moving the code
599 from the native file to the target file. But this doesn't
600 always make sense. */
602 reg_data
= regs
+ (regno
- ARM_F0_REGNUM
) * FP_REGISTER_SIZE
;
603 reg_tag
= regs
[(regno
- ARM_F0_REGNUM
) + NWFPE_TAGS_OFFSET
];
608 memcpy (reg_data
, buf
, 4);
611 memcpy (reg_data
, buf
+ 4, 4);
612 memcpy (reg_data
+ 4, buf
, 4);
615 memcpy (reg_data
, buf
, 4);
616 memcpy (reg_data
+ 4, buf
+ 8, 4);
617 memcpy (reg_data
+ 8, buf
+ 4, 4);
625 arm_linux_supply_nwfpe (const struct regset
*regset
,
626 struct regcache
*regcache
,
627 int regnum
, const void *regs_buf
, size_t len
)
629 const gdb_byte
*regs
= (const gdb_byte
*) regs_buf
;
632 if (regnum
== ARM_FPS_REGNUM
|| regnum
== -1)
633 regcache_raw_supply (regcache
, ARM_FPS_REGNUM
,
634 regs
+ NWFPE_FPSR_OFFSET
);
636 for (regno
= ARM_F0_REGNUM
; regno
<= ARM_F7_REGNUM
; regno
++)
637 if (regnum
== -1 || regnum
== regno
)
638 supply_nwfpe_register (regcache
, regno
, regs
);
642 arm_linux_collect_nwfpe (const struct regset
*regset
,
643 const struct regcache
*regcache
,
644 int regnum
, void *regs_buf
, size_t len
)
646 gdb_byte
*regs
= (gdb_byte
*) regs_buf
;
649 for (regno
= ARM_F0_REGNUM
; regno
<= ARM_F7_REGNUM
; regno
++)
650 if (regnum
== -1 || regnum
== regno
)
651 collect_nwfpe_register (regcache
, regno
, regs
);
653 if (regnum
== ARM_FPS_REGNUM
|| regnum
== -1)
654 regcache_raw_collect (regcache
, ARM_FPS_REGNUM
,
655 regs
+ INT_REGISTER_SIZE
* ARM_FPS_REGNUM
);
658 /* Support VFP register format. */
660 #define ARM_LINUX_SIZEOF_VFP (32 * 8 + 4)
663 arm_linux_supply_vfp (const struct regset
*regset
,
664 struct regcache
*regcache
,
665 int regnum
, const void *regs_buf
, size_t len
)
667 const gdb_byte
*regs
= (const gdb_byte
*) regs_buf
;
670 if (regnum
== ARM_FPSCR_REGNUM
|| regnum
== -1)
671 regcache_raw_supply (regcache
, ARM_FPSCR_REGNUM
, regs
+ 32 * 8);
673 for (regno
= ARM_D0_REGNUM
; regno
<= ARM_D31_REGNUM
; regno
++)
674 if (regnum
== -1 || regnum
== regno
)
675 regcache_raw_supply (regcache
, regno
,
676 regs
+ (regno
- ARM_D0_REGNUM
) * 8);
680 arm_linux_collect_vfp (const struct regset
*regset
,
681 const struct regcache
*regcache
,
682 int regnum
, void *regs_buf
, size_t len
)
684 gdb_byte
*regs
= (gdb_byte
*) regs_buf
;
687 if (regnum
== ARM_FPSCR_REGNUM
|| regnum
== -1)
688 regcache_raw_collect (regcache
, ARM_FPSCR_REGNUM
, regs
+ 32 * 8);
690 for (regno
= ARM_D0_REGNUM
; regno
<= ARM_D31_REGNUM
; regno
++)
691 if (regnum
== -1 || regnum
== regno
)
692 regcache_raw_collect (regcache
, regno
,
693 regs
+ (regno
- ARM_D0_REGNUM
) * 8);
696 static const struct regset arm_linux_gregset
=
698 NULL
, arm_linux_supply_gregset
, arm_linux_collect_gregset
701 static const struct regset arm_linux_fpregset
=
703 NULL
, arm_linux_supply_nwfpe
, arm_linux_collect_nwfpe
706 static const struct regset arm_linux_vfpregset
=
708 NULL
, arm_linux_supply_vfp
, arm_linux_collect_vfp
711 /* Iterate over core file register note sections. */
714 arm_linux_iterate_over_regset_sections (struct gdbarch
*gdbarch
,
715 iterate_over_regset_sections_cb
*cb
,
717 const struct regcache
*regcache
)
719 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
721 cb (".reg", ARM_LINUX_SIZEOF_GREGSET
, &arm_linux_gregset
, NULL
, cb_data
);
723 if (tdep
->vfp_register_count
> 0)
724 cb (".reg-arm-vfp", ARM_LINUX_SIZEOF_VFP
, &arm_linux_vfpregset
,
725 "VFP floating-point", cb_data
);
726 else if (tdep
->have_fpa_registers
)
727 cb (".reg2", ARM_LINUX_SIZEOF_NWFPE
, &arm_linux_fpregset
,
728 "FPA floating-point", cb_data
);
731 /* Determine target description from core file. */
733 static const struct target_desc
*
734 arm_linux_core_read_description (struct gdbarch
*gdbarch
,
735 struct target_ops
*target
,
738 CORE_ADDR arm_hwcap
= 0;
740 if (target_auxv_search (target
, AT_HWCAP
, &arm_hwcap
) != 1)
743 if (arm_hwcap
& HWCAP_VFP
)
745 /* NEON implies VFPv3-D32 or no-VFP unit. Say that we only support
746 Neon with VFPv3-D32. */
747 if (arm_hwcap
& HWCAP_NEON
)
748 return tdesc_arm_with_neon
;
749 else if ((arm_hwcap
& (HWCAP_VFPv3
| HWCAP_VFPv3D16
)) == HWCAP_VFPv3
)
750 return tdesc_arm_with_vfpv3
;
752 return tdesc_arm_with_vfpv2
;
759 /* Copy the value of next pc of sigreturn and rt_sigrturn into PC,
760 return 1. In addition, set IS_THUMB depending on whether we
761 will return to ARM or Thumb code. Return 0 if it is not a
762 rt_sigreturn/sigreturn syscall. */
764 arm_linux_sigreturn_return_addr (struct frame_info
*frame
,
765 unsigned long svc_number
,
766 CORE_ADDR
*pc
, int *is_thumb
)
768 /* Is this a sigreturn or rt_sigreturn syscall? */
769 if (svc_number
== 119 || svc_number
== 173)
771 if (get_frame_type (frame
) == SIGTRAMP_FRAME
)
773 ULONGEST t_bit
= arm_psr_thumb_bit (frame_unwind_arch (frame
));
775 = frame_unwind_register_unsigned (frame
, ARM_PS_REGNUM
);
777 *is_thumb
= (cpsr
& t_bit
) != 0;
778 *pc
= frame_unwind_caller_pc (frame
);
785 /* Find the value of the next PC after a sigreturn or rt_sigreturn syscall
786 based on current processor state. In addition, set IS_THUMB depending
787 on whether we will return to ARM or Thumb code. */
790 arm_linux_sigreturn_next_pc (struct regcache
*regcache
,
791 unsigned long svc_number
, int *is_thumb
)
794 unsigned long sp_data
;
795 CORE_ADDR next_pc
= 0;
796 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
797 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
799 int is_sigreturn
= 0;
802 gdb_assert (svc_number
== ARM_SIGRETURN
803 || svc_number
== ARM_RT_SIGRETURN
);
805 is_sigreturn
= (svc_number
== ARM_SIGRETURN
);
806 regcache_cooked_read_unsigned (regcache
, ARM_SP_REGNUM
, &sp
);
807 sp_data
= read_memory_unsigned_integer (sp
, 4, byte_order
);
809 pc_offset
= arm_linux_sigreturn_next_pc_offset (sp
, sp_data
, svc_number
,
812 next_pc
= read_memory_unsigned_integer (sp
+ pc_offset
, 4, byte_order
);
814 /* Set IS_THUMB according the CPSR saved on the stack. */
815 cpsr
= read_memory_unsigned_integer (sp
+ pc_offset
+ 4, 4, byte_order
);
816 *is_thumb
= ((cpsr
& arm_psr_thumb_bit (gdbarch
)) != 0);
821 /* At a ptrace syscall-stop, return the syscall number. This either
822 comes from the SWI instruction (OABI) or from r7 (EABI).
824 When the function fails, it should return -1. */
827 arm_linux_get_syscall_number (struct gdbarch
*gdbarch
,
830 struct regcache
*regs
= get_thread_regcache (ptid
);
831 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
835 ULONGEST t_bit
= arm_psr_thumb_bit (gdbarch
);
837 ULONGEST svc_number
= -1;
839 regcache_cooked_read_unsigned (regs
, ARM_PC_REGNUM
, &pc
);
840 regcache_cooked_read_unsigned (regs
, ARM_PS_REGNUM
, &cpsr
);
841 is_thumb
= (cpsr
& t_bit
) != 0;
845 regcache_cooked_read_unsigned (regs
, 7, &svc_number
);
849 enum bfd_endian byte_order_for_code
=
850 gdbarch_byte_order_for_code (gdbarch
);
852 /* PC gets incremented before the syscall-stop, so read the
853 previous instruction. */
854 unsigned long this_instr
=
855 read_memory_unsigned_integer (pc
- 4, 4, byte_order_for_code
);
857 unsigned long svc_operand
= (0x00ffffff & this_instr
);
862 svc_number
= svc_operand
- 0x900000;
867 regcache_cooked_read_unsigned (regs
, 7, &svc_number
);
875 arm_linux_get_next_pcs_syscall_next_pc (struct arm_get_next_pcs
*self
,
878 CORE_ADDR next_pc
= 0;
879 int is_thumb
= arm_is_thumb (self
->regcache
);
880 ULONGEST svc_number
= 0;
881 struct gdbarch
*gdbarch
= get_regcache_arch (self
->regcache
);
885 svc_number
= regcache_raw_get_unsigned (self
->regcache
, 7);
890 struct gdbarch
*gdbarch
= get_regcache_arch (self
->regcache
);
891 enum bfd_endian byte_order_for_code
=
892 gdbarch_byte_order_for_code (gdbarch
);
893 unsigned long this_instr
=
894 read_memory_unsigned_integer (pc
, 4, byte_order_for_code
);
896 unsigned long svc_operand
= (0x00ffffff & this_instr
);
897 if (svc_operand
) /* OABI. */
899 svc_number
= svc_operand
- 0x900000;
903 svc_number
= regcache_raw_get_unsigned (self
->regcache
, 7);
909 if (svc_number
== ARM_SIGRETURN
|| svc_number
== ARM_RT_SIGRETURN
)
911 /* SIGRETURN or RT_SIGRETURN may affect the arm thumb mode, so
913 next_pc
= arm_linux_sigreturn_next_pc (self
->regcache
, svc_number
,
917 /* Addresses for calling Thumb functions have the bit 0 set. */
919 next_pc
= MAKE_THUMB_ADDR (next_pc
);
925 /* Insert a single step breakpoint at the next executed instruction. */
928 arm_linux_software_single_step (struct frame_info
*frame
)
930 struct regcache
*regcache
= get_current_regcache ();
931 struct gdbarch
*gdbarch
= get_regcache_arch (regcache
);
932 struct address_space
*aspace
= get_regcache_aspace (regcache
);
933 struct arm_get_next_pcs next_pcs_ctx
;
936 VEC (CORE_ADDR
) *next_pcs
= NULL
;
937 struct cleanup
*old_chain
= make_cleanup (VEC_cleanup (CORE_ADDR
), &next_pcs
);
939 /* If the target does have hardware single step, GDB doesn't have
940 to bother software single step. */
941 if (target_can_do_single_step () == 1)
944 arm_get_next_pcs_ctor (&next_pcs_ctx
,
945 &arm_linux_get_next_pcs_ops
,
946 gdbarch_byte_order (gdbarch
),
947 gdbarch_byte_order_for_code (gdbarch
),
951 next_pcs
= arm_get_next_pcs (&next_pcs_ctx
);
953 for (i
= 0; VEC_iterate (CORE_ADDR
, next_pcs
, i
, pc
); i
++)
954 arm_insert_single_step_breakpoint (gdbarch
, aspace
, pc
);
956 do_cleanups (old_chain
);
961 /* Support for displaced stepping of Linux SVC instructions. */
964 arm_linux_cleanup_svc (struct gdbarch
*gdbarch
,
965 struct regcache
*regs
,
966 struct displaced_step_closure
*dsc
)
968 ULONGEST apparent_pc
;
971 regcache_cooked_read_unsigned (regs
, ARM_PC_REGNUM
, &apparent_pc
);
973 within_scratch
= (apparent_pc
>= dsc
->scratch_base
974 && apparent_pc
< (dsc
->scratch_base
975 + DISPLACED_MODIFIED_INSNS
* 4 + 4));
979 fprintf_unfiltered (gdb_stdlog
, "displaced: PC is apparently %.8lx after "
980 "SVC step ", (unsigned long) apparent_pc
);
982 fprintf_unfiltered (gdb_stdlog
, "(within scratch space)\n");
984 fprintf_unfiltered (gdb_stdlog
, "(outside scratch space)\n");
988 displaced_write_reg (regs
, dsc
, ARM_PC_REGNUM
,
989 dsc
->insn_addr
+ dsc
->insn_size
, BRANCH_WRITE_PC
);
993 arm_linux_copy_svc (struct gdbarch
*gdbarch
, struct regcache
*regs
,
994 struct displaced_step_closure
*dsc
)
996 CORE_ADDR return_to
= 0;
998 struct frame_info
*frame
;
999 unsigned int svc_number
= displaced_read_reg (regs
, dsc
, 7);
1000 int is_sigreturn
= 0;
1003 frame
= get_current_frame ();
1005 is_sigreturn
= arm_linux_sigreturn_return_addr(frame
, svc_number
,
1006 &return_to
, &is_thumb
);
1009 struct symtab_and_line sal
;
1011 if (debug_displaced
)
1012 fprintf_unfiltered (gdb_stdlog
, "displaced: found "
1013 "sigreturn/rt_sigreturn SVC call. PC in "
1015 (unsigned long) get_frame_pc (frame
));
1017 if (debug_displaced
)
1018 fprintf_unfiltered (gdb_stdlog
, "displaced: unwind pc = %lx. "
1019 "Setting momentary breakpoint.\n",
1020 (unsigned long) return_to
);
1022 gdb_assert (inferior_thread ()->control
.step_resume_breakpoint
1025 sal
= find_pc_line (return_to
, 0);
1027 sal
.section
= find_pc_overlay (return_to
);
1028 sal
.explicit_pc
= 1;
1030 frame
= get_prev_frame (frame
);
1034 inferior_thread ()->control
.step_resume_breakpoint
1035 = set_momentary_breakpoint (gdbarch
, sal
, get_frame_id (frame
),
1038 /* set_momentary_breakpoint invalidates FRAME. */
1041 /* We need to make sure we actually insert the momentary
1042 breakpoint set above. */
1043 insert_breakpoints ();
1045 else if (debug_displaced
)
1046 fprintf_unfiltered (gdb_stderr
, "displaced: couldn't find previous "
1047 "frame to set momentary breakpoint for "
1048 "sigreturn/rt_sigreturn\n");
1050 else if (debug_displaced
)
1051 fprintf_unfiltered (gdb_stdlog
, "displaced: found SVC call\n");
1053 /* Preparation: If we detect sigreturn, set momentary breakpoint at resume
1054 location, else nothing.
1055 Insn: unmodified svc.
1056 Cleanup: if pc lands in scratch space, pc <- insn_addr + insn_size
1057 else leave pc alone. */
1060 dsc
->cleanup
= &arm_linux_cleanup_svc
;
1061 /* Pretend we wrote to the PC, so cleanup doesn't set PC to the next
1063 dsc
->wrote_to_pc
= 1;
1069 /* The following two functions implement single-stepping over calls to Linux
1070 kernel helper routines, which perform e.g. atomic operations on architecture
1071 variants which don't support them natively.
1073 When this function is called, the PC will be pointing at the kernel helper
1074 (at an address inaccessible to GDB), and r14 will point to the return
1075 address. Displaced stepping always executes code in the copy area:
1076 so, make the copy-area instruction branch back to the kernel helper (the
1077 "from" address), and make r14 point to the breakpoint in the copy area. In
1078 that way, we regain control once the kernel helper returns, and can clean
1079 up appropriately (as if we had just returned from the kernel helper as it
1080 would have been called from the non-displaced location). */
1083 cleanup_kernel_helper_return (struct gdbarch
*gdbarch
,
1084 struct regcache
*regs
,
1085 struct displaced_step_closure
*dsc
)
1087 displaced_write_reg (regs
, dsc
, ARM_LR_REGNUM
, dsc
->tmp
[0], CANNOT_WRITE_PC
);
1088 displaced_write_reg (regs
, dsc
, ARM_PC_REGNUM
, dsc
->tmp
[0], BRANCH_WRITE_PC
);
1092 arm_catch_kernel_helper_return (struct gdbarch
*gdbarch
, CORE_ADDR from
,
1093 CORE_ADDR to
, struct regcache
*regs
,
1094 struct displaced_step_closure
*dsc
)
1096 enum bfd_endian byte_order
= gdbarch_byte_order (gdbarch
);
1099 dsc
->insn_addr
= from
;
1100 dsc
->cleanup
= &cleanup_kernel_helper_return
;
1101 /* Say we wrote to the PC, else cleanup will set PC to the next
1102 instruction in the helper, which isn't helpful. */
1103 dsc
->wrote_to_pc
= 1;
1105 /* Preparation: tmp[0] <- r14
1106 r14 <- <scratch space>+4
1107 *(<scratch space>+8) <- from
1108 Insn: ldr pc, [r14, #4]
1109 Cleanup: r14 <- tmp[0], pc <- tmp[0]. */
1111 dsc
->tmp
[0] = displaced_read_reg (regs
, dsc
, ARM_LR_REGNUM
);
1112 displaced_write_reg (regs
, dsc
, ARM_LR_REGNUM
, (ULONGEST
) to
+ 4,
1114 write_memory_unsigned_integer (to
+ 8, 4, byte_order
, from
);
1116 dsc
->modinsn
[0] = 0xe59ef004; /* ldr pc, [lr, #4]. */
1119 /* Linux-specific displaced step instruction copying function. Detects when
1120 the program has stepped into a Linux kernel helper routine (which must be
1121 handled as a special case). */
1123 static struct displaced_step_closure
*
1124 arm_linux_displaced_step_copy_insn (struct gdbarch
*gdbarch
,
1125 CORE_ADDR from
, CORE_ADDR to
,
1126 struct regcache
*regs
)
1128 struct displaced_step_closure
*dsc
= XNEW (struct displaced_step_closure
);
1130 /* Detect when we enter an (inaccessible by GDB) Linux kernel helper, and
1131 stop at the return location. */
1132 if (from
> 0xffff0000)
1134 if (debug_displaced
)
1135 fprintf_unfiltered (gdb_stdlog
, "displaced: detected kernel helper "
1136 "at %.8lx\n", (unsigned long) from
);
1138 arm_catch_kernel_helper_return (gdbarch
, from
, to
, regs
, dsc
);
1142 /* Override the default handling of SVC instructions. */
1143 dsc
->u
.svc
.copy_svc_os
= arm_linux_copy_svc
;
1145 arm_process_displaced_insn (gdbarch
, from
, to
, regs
, dsc
);
1148 arm_displaced_init_closure (gdbarch
, from
, to
, dsc
);
1153 /* Implementation of `gdbarch_stap_is_single_operand', as defined in
1157 arm_stap_is_single_operand (struct gdbarch
*gdbarch
, const char *s
)
1159 return (*s
== '#' || *s
== '$' || isdigit (*s
) /* Literal number. */
1160 || *s
== '[' /* Register indirection or
1162 || isalpha (*s
)); /* Register value. */
1165 /* This routine is used to parse a special token in ARM's assembly.
1167 The special tokens parsed by it are:
1169 - Register displacement (e.g, [fp, #-8])
1171 It returns one if the special token has been parsed successfully,
1172 or zero if the current token is not considered special. */
1175 arm_stap_parse_special_token (struct gdbarch
*gdbarch
,
1176 struct stap_parse_info
*p
)
1180 /* Temporary holder for lookahead. */
1181 const char *tmp
= p
->arg
;
1183 /* Used to save the register name. */
1194 /* Register name. */
1195 while (isalnum (*tmp
))
1202 regname
= (char *) alloca (len
+ 2);
1205 if (isdigit (*start
))
1207 /* If we are dealing with a register whose name begins with a
1208 digit, it means we should prefix the name with the letter
1209 `r', because GDB expects this name pattern. Otherwise (e.g.,
1210 we are dealing with the register `fp'), we don't need to
1211 add such a prefix. */
1216 strncpy (regname
+ offset
, start
, len
);
1218 regname
[len
] = '\0';
1220 if (user_reg_map_name_to_regnum (gdbarch
, regname
, len
) == -1)
1221 error (_("Invalid register name `%s' on expression `%s'."),
1222 regname
, p
->saved_arg
);
1225 tmp
= skip_spaces_const (tmp
);
1226 if (*tmp
== '#' || *tmp
== '$')
1235 displacement
= strtol (tmp
, &endp
, 10);
1238 /* Skipping last `]'. */
1242 /* The displacement. */
1243 write_exp_elt_opcode (&p
->pstate
, OP_LONG
);
1244 write_exp_elt_type (&p
->pstate
, builtin_type (gdbarch
)->builtin_long
);
1245 write_exp_elt_longcst (&p
->pstate
, displacement
);
1246 write_exp_elt_opcode (&p
->pstate
, OP_LONG
);
1248 write_exp_elt_opcode (&p
->pstate
, UNOP_NEG
);
1250 /* The register name. */
1251 write_exp_elt_opcode (&p
->pstate
, OP_REGISTER
);
1254 write_exp_string (&p
->pstate
, str
);
1255 write_exp_elt_opcode (&p
->pstate
, OP_REGISTER
);
1257 write_exp_elt_opcode (&p
->pstate
, BINOP_ADD
);
1259 /* Casting to the expected type. */
1260 write_exp_elt_opcode (&p
->pstate
, UNOP_CAST
);
1261 write_exp_elt_type (&p
->pstate
, lookup_pointer_type (p
->arg_type
));
1262 write_exp_elt_opcode (&p
->pstate
, UNOP_CAST
);
1264 write_exp_elt_opcode (&p
->pstate
, UNOP_IND
);
1274 /* ARM process record-replay constructs: syscall, signal etc. */
1276 struct linux_record_tdep arm_linux_record_tdep
;
1278 /* arm_canonicalize_syscall maps from the native arm Linux set
1279 of syscall ids into a canonical set of syscall ids used by
1282 static enum gdb_syscall
1283 arm_canonicalize_syscall (int syscall
)
1285 enum { sys_process_vm_writev
= 377 };
1287 if (syscall
<= gdb_sys_sched_getaffinity
)
1288 return (enum gdb_syscall
) syscall
;
1289 else if (syscall
>= 243 && syscall
<= 247)
1290 return (enum gdb_syscall
) (syscall
+ 2);
1291 else if (syscall
>= 248 && syscall
<= 253)
1292 return (enum gdb_syscall
) (syscall
+ 4);
1294 return gdb_sys_no_syscall
;
1297 /* Record all registers but PC register for process-record. */
1300 arm_all_but_pc_registers_record (struct regcache
*regcache
)
1304 for (i
= 0; i
< ARM_PC_REGNUM
; i
++)
1306 if (record_full_arch_list_add_reg (regcache
, ARM_A1_REGNUM
+ i
))
1310 if (record_full_arch_list_add_reg (regcache
, ARM_PS_REGNUM
))
1316 /* Handler for arm system call instruction recording. */
1319 arm_linux_syscall_record (struct regcache
*regcache
, unsigned long svc_number
)
1322 enum gdb_syscall syscall_gdb
;
1324 syscall_gdb
= arm_canonicalize_syscall (svc_number
);
1326 if (syscall_gdb
== gdb_sys_no_syscall
)
1328 printf_unfiltered (_("Process record and replay target doesn't "
1329 "support syscall number %s\n"),
1330 plongest (svc_number
));
1334 if (syscall_gdb
== gdb_sys_sigreturn
1335 || syscall_gdb
== gdb_sys_rt_sigreturn
)
1337 if (arm_all_but_pc_registers_record (regcache
))
1342 ret
= record_linux_system_call (syscall_gdb
, regcache
,
1343 &arm_linux_record_tdep
);
1347 /* Record the return value of the system call. */
1348 if (record_full_arch_list_add_reg (regcache
, ARM_A1_REGNUM
))
1351 if (record_full_arch_list_add_reg (regcache
, ARM_LR_REGNUM
))
1354 if (record_full_arch_list_add_reg (regcache
, ARM_PS_REGNUM
))
1360 /* Implement the skip_trampoline_code gdbarch method. */
1363 arm_linux_skip_trampoline_code (struct frame_info
*frame
, CORE_ADDR pc
)
1365 CORE_ADDR target_pc
= arm_skip_stub (frame
, pc
);
1370 return find_solib_trampoline_target (frame
, pc
);
1374 arm_linux_init_abi (struct gdbarch_info info
,
1375 struct gdbarch
*gdbarch
)
1377 static const char *const stap_integer_prefixes
[] = { "#", "$", "", NULL
};
1378 static const char *const stap_register_prefixes
[] = { "r", NULL
};
1379 static const char *const stap_register_indirection_prefixes
[] = { "[",
1381 static const char *const stap_register_indirection_suffixes
[] = { "]",
1383 struct gdbarch_tdep
*tdep
= gdbarch_tdep (gdbarch
);
1385 linux_init_abi (info
, gdbarch
);
1387 tdep
->lowest_pc
= 0x8000;
1388 if (info
.byte_order_for_code
== BFD_ENDIAN_BIG
)
1390 if (tdep
->arm_abi
== ARM_ABI_AAPCS
)
1391 tdep
->arm_breakpoint
= eabi_linux_arm_be_breakpoint
;
1393 tdep
->arm_breakpoint
= arm_linux_arm_be_breakpoint
;
1394 tdep
->thumb_breakpoint
= arm_linux_thumb_be_breakpoint
;
1395 tdep
->thumb2_breakpoint
= arm_linux_thumb2_be_breakpoint
;
1399 if (tdep
->arm_abi
== ARM_ABI_AAPCS
)
1400 tdep
->arm_breakpoint
= eabi_linux_arm_le_breakpoint
;
1402 tdep
->arm_breakpoint
= arm_linux_arm_le_breakpoint
;
1403 tdep
->thumb_breakpoint
= arm_linux_thumb_le_breakpoint
;
1404 tdep
->thumb2_breakpoint
= arm_linux_thumb2_le_breakpoint
;
1406 tdep
->arm_breakpoint_size
= sizeof (arm_linux_arm_le_breakpoint
);
1407 tdep
->thumb_breakpoint_size
= sizeof (arm_linux_thumb_le_breakpoint
);
1408 tdep
->thumb2_breakpoint_size
= sizeof (arm_linux_thumb2_le_breakpoint
);
1410 if (tdep
->fp_model
== ARM_FLOAT_AUTO
)
1411 tdep
->fp_model
= ARM_FLOAT_FPA
;
1413 switch (tdep
->fp_model
)
1416 tdep
->jb_pc
= ARM_LINUX_JB_PC_FPA
;
1418 case ARM_FLOAT_SOFT_FPA
:
1419 case ARM_FLOAT_SOFT_VFP
:
1421 tdep
->jb_pc
= ARM_LINUX_JB_PC_EABI
;
1425 (__FILE__
, __LINE__
,
1426 _("arm_linux_init_abi: Floating point model not supported"));
1429 tdep
->jb_elt_size
= ARM_LINUX_JB_ELEMENT_SIZE
;
1431 set_solib_svr4_fetch_link_map_offsets
1432 (gdbarch
, svr4_ilp32_fetch_link_map_offsets
);
1434 /* Single stepping. */
1435 set_gdbarch_software_single_step (gdbarch
, arm_linux_software_single_step
);
1437 /* Shared library handling. */
1438 set_gdbarch_skip_trampoline_code (gdbarch
, arm_linux_skip_trampoline_code
);
1439 set_gdbarch_skip_solib_resolver (gdbarch
, glibc_skip_solib_resolver
);
1441 /* Enable TLS support. */
1442 set_gdbarch_fetch_tls_load_module_address (gdbarch
,
1443 svr4_fetch_objfile_link_map
);
1445 tramp_frame_prepend_unwinder (gdbarch
,
1446 &arm_linux_sigreturn_tramp_frame
);
1447 tramp_frame_prepend_unwinder (gdbarch
,
1448 &arm_linux_rt_sigreturn_tramp_frame
);
1449 tramp_frame_prepend_unwinder (gdbarch
,
1450 &arm_eabi_linux_sigreturn_tramp_frame
);
1451 tramp_frame_prepend_unwinder (gdbarch
,
1452 &arm_eabi_linux_rt_sigreturn_tramp_frame
);
1453 tramp_frame_prepend_unwinder (gdbarch
,
1454 &thumb2_eabi_linux_sigreturn_tramp_frame
);
1455 tramp_frame_prepend_unwinder (gdbarch
,
1456 &thumb2_eabi_linux_rt_sigreturn_tramp_frame
);
1457 tramp_frame_prepend_unwinder (gdbarch
,
1458 &arm_linux_restart_syscall_tramp_frame
);
1459 tramp_frame_prepend_unwinder (gdbarch
,
1460 &arm_kernel_linux_restart_syscall_tramp_frame
);
1462 /* Core file support. */
1463 set_gdbarch_iterate_over_regset_sections
1464 (gdbarch
, arm_linux_iterate_over_regset_sections
);
1465 set_gdbarch_core_read_description (gdbarch
, arm_linux_core_read_description
);
1467 /* Displaced stepping. */
1468 set_gdbarch_displaced_step_copy_insn (gdbarch
,
1469 arm_linux_displaced_step_copy_insn
);
1470 set_gdbarch_displaced_step_fixup (gdbarch
, arm_displaced_step_fixup
);
1471 set_gdbarch_displaced_step_free_closure (gdbarch
,
1472 simple_displaced_step_free_closure
);
1473 set_gdbarch_displaced_step_location (gdbarch
, linux_displaced_step_location
);
1475 /* Reversible debugging, process record. */
1476 set_gdbarch_process_record (gdbarch
, arm_process_record
);
1478 /* SystemTap functions. */
1479 set_gdbarch_stap_integer_prefixes (gdbarch
, stap_integer_prefixes
);
1480 set_gdbarch_stap_register_prefixes (gdbarch
, stap_register_prefixes
);
1481 set_gdbarch_stap_register_indirection_prefixes (gdbarch
,
1482 stap_register_indirection_prefixes
);
1483 set_gdbarch_stap_register_indirection_suffixes (gdbarch
,
1484 stap_register_indirection_suffixes
);
1485 set_gdbarch_stap_gdb_register_prefix (gdbarch
, "r");
1486 set_gdbarch_stap_is_single_operand (gdbarch
, arm_stap_is_single_operand
);
1487 set_gdbarch_stap_parse_special_token (gdbarch
,
1488 arm_stap_parse_special_token
);
1490 /* `catch syscall' */
1491 set_xml_syscall_file_name (gdbarch
, "syscalls/arm-linux.xml");
1492 set_gdbarch_get_syscall_number (gdbarch
, arm_linux_get_syscall_number
);
1494 /* Syscall record. */
1495 tdep
->arm_syscall_record
= arm_linux_syscall_record
;
1497 /* Initialize the arm_linux_record_tdep. */
1498 /* These values are the size of the type that will be used in a system
1499 call. They are obtained from Linux Kernel source. */
1500 arm_linux_record_tdep
.size_pointer
1501 = gdbarch_ptr_bit (gdbarch
) / TARGET_CHAR_BIT
;
1502 arm_linux_record_tdep
.size__old_kernel_stat
= 32;
1503 arm_linux_record_tdep
.size_tms
= 16;
1504 arm_linux_record_tdep
.size_loff_t
= 8;
1505 arm_linux_record_tdep
.size_flock
= 16;
1506 arm_linux_record_tdep
.size_oldold_utsname
= 45;
1507 arm_linux_record_tdep
.size_ustat
= 20;
1508 arm_linux_record_tdep
.size_old_sigaction
= 16;
1509 arm_linux_record_tdep
.size_old_sigset_t
= 4;
1510 arm_linux_record_tdep
.size_rlimit
= 8;
1511 arm_linux_record_tdep
.size_rusage
= 72;
1512 arm_linux_record_tdep
.size_timeval
= 8;
1513 arm_linux_record_tdep
.size_timezone
= 8;
1514 arm_linux_record_tdep
.size_old_gid_t
= 2;
1515 arm_linux_record_tdep
.size_old_uid_t
= 2;
1516 arm_linux_record_tdep
.size_fd_set
= 128;
1517 arm_linux_record_tdep
.size_old_dirent
= 268;
1518 arm_linux_record_tdep
.size_statfs
= 64;
1519 arm_linux_record_tdep
.size_statfs64
= 84;
1520 arm_linux_record_tdep
.size_sockaddr
= 16;
1521 arm_linux_record_tdep
.size_int
1522 = gdbarch_int_bit (gdbarch
) / TARGET_CHAR_BIT
;
1523 arm_linux_record_tdep
.size_long
1524 = gdbarch_long_bit (gdbarch
) / TARGET_CHAR_BIT
;
1525 arm_linux_record_tdep
.size_ulong
1526 = gdbarch_long_bit (gdbarch
) / TARGET_CHAR_BIT
;
1527 arm_linux_record_tdep
.size_msghdr
= 28;
1528 arm_linux_record_tdep
.size_itimerval
= 16;
1529 arm_linux_record_tdep
.size_stat
= 88;
1530 arm_linux_record_tdep
.size_old_utsname
= 325;
1531 arm_linux_record_tdep
.size_sysinfo
= 64;
1532 arm_linux_record_tdep
.size_msqid_ds
= 88;
1533 arm_linux_record_tdep
.size_shmid_ds
= 84;
1534 arm_linux_record_tdep
.size_new_utsname
= 390;
1535 arm_linux_record_tdep
.size_timex
= 128;
1536 arm_linux_record_tdep
.size_mem_dqinfo
= 24;
1537 arm_linux_record_tdep
.size_if_dqblk
= 68;
1538 arm_linux_record_tdep
.size_fs_quota_stat
= 68;
1539 arm_linux_record_tdep
.size_timespec
= 8;
1540 arm_linux_record_tdep
.size_pollfd
= 8;
1541 arm_linux_record_tdep
.size_NFS_FHSIZE
= 32;
1542 arm_linux_record_tdep
.size_knfsd_fh
= 132;
1543 arm_linux_record_tdep
.size_TASK_COMM_LEN
= 16;
1544 arm_linux_record_tdep
.size_sigaction
= 20;
1545 arm_linux_record_tdep
.size_sigset_t
= 8;
1546 arm_linux_record_tdep
.size_siginfo_t
= 128;
1547 arm_linux_record_tdep
.size_cap_user_data_t
= 12;
1548 arm_linux_record_tdep
.size_stack_t
= 12;
1549 arm_linux_record_tdep
.size_off_t
= arm_linux_record_tdep
.size_long
;
1550 arm_linux_record_tdep
.size_stat64
= 96;
1551 arm_linux_record_tdep
.size_gid_t
= 4;
1552 arm_linux_record_tdep
.size_uid_t
= 4;
1553 arm_linux_record_tdep
.size_PAGE_SIZE
= 4096;
1554 arm_linux_record_tdep
.size_flock64
= 24;
1555 arm_linux_record_tdep
.size_user_desc
= 16;
1556 arm_linux_record_tdep
.size_io_event
= 32;
1557 arm_linux_record_tdep
.size_iocb
= 64;
1558 arm_linux_record_tdep
.size_epoll_event
= 12;
1559 arm_linux_record_tdep
.size_itimerspec
1560 = arm_linux_record_tdep
.size_timespec
* 2;
1561 arm_linux_record_tdep
.size_mq_attr
= 32;
1562 arm_linux_record_tdep
.size_termios
= 36;
1563 arm_linux_record_tdep
.size_termios2
= 44;
1564 arm_linux_record_tdep
.size_pid_t
= 4;
1565 arm_linux_record_tdep
.size_winsize
= 8;
1566 arm_linux_record_tdep
.size_serial_struct
= 60;
1567 arm_linux_record_tdep
.size_serial_icounter_struct
= 80;
1568 arm_linux_record_tdep
.size_hayes_esp_config
= 12;
1569 arm_linux_record_tdep
.size_size_t
= 4;
1570 arm_linux_record_tdep
.size_iovec
= 8;
1571 arm_linux_record_tdep
.size_time_t
= 4;
1573 /* These values are the second argument of system call "sys_ioctl".
1574 They are obtained from Linux Kernel source. */
1575 arm_linux_record_tdep
.ioctl_TCGETS
= 0x5401;
1576 arm_linux_record_tdep
.ioctl_TCSETS
= 0x5402;
1577 arm_linux_record_tdep
.ioctl_TCSETSW
= 0x5403;
1578 arm_linux_record_tdep
.ioctl_TCSETSF
= 0x5404;
1579 arm_linux_record_tdep
.ioctl_TCGETA
= 0x5405;
1580 arm_linux_record_tdep
.ioctl_TCSETA
= 0x5406;
1581 arm_linux_record_tdep
.ioctl_TCSETAW
= 0x5407;
1582 arm_linux_record_tdep
.ioctl_TCSETAF
= 0x5408;
1583 arm_linux_record_tdep
.ioctl_TCSBRK
= 0x5409;
1584 arm_linux_record_tdep
.ioctl_TCXONC
= 0x540a;
1585 arm_linux_record_tdep
.ioctl_TCFLSH
= 0x540b;
1586 arm_linux_record_tdep
.ioctl_TIOCEXCL
= 0x540c;
1587 arm_linux_record_tdep
.ioctl_TIOCNXCL
= 0x540d;
1588 arm_linux_record_tdep
.ioctl_TIOCSCTTY
= 0x540e;
1589 arm_linux_record_tdep
.ioctl_TIOCGPGRP
= 0x540f;
1590 arm_linux_record_tdep
.ioctl_TIOCSPGRP
= 0x5410;
1591 arm_linux_record_tdep
.ioctl_TIOCOUTQ
= 0x5411;
1592 arm_linux_record_tdep
.ioctl_TIOCSTI
= 0x5412;
1593 arm_linux_record_tdep
.ioctl_TIOCGWINSZ
= 0x5413;
1594 arm_linux_record_tdep
.ioctl_TIOCSWINSZ
= 0x5414;
1595 arm_linux_record_tdep
.ioctl_TIOCMGET
= 0x5415;
1596 arm_linux_record_tdep
.ioctl_TIOCMBIS
= 0x5416;
1597 arm_linux_record_tdep
.ioctl_TIOCMBIC
= 0x5417;
1598 arm_linux_record_tdep
.ioctl_TIOCMSET
= 0x5418;
1599 arm_linux_record_tdep
.ioctl_TIOCGSOFTCAR
= 0x5419;
1600 arm_linux_record_tdep
.ioctl_TIOCSSOFTCAR
= 0x541a;
1601 arm_linux_record_tdep
.ioctl_FIONREAD
= 0x541b;
1602 arm_linux_record_tdep
.ioctl_TIOCINQ
= arm_linux_record_tdep
.ioctl_FIONREAD
;
1603 arm_linux_record_tdep
.ioctl_TIOCLINUX
= 0x541c;
1604 arm_linux_record_tdep
.ioctl_TIOCCONS
= 0x541d;
1605 arm_linux_record_tdep
.ioctl_TIOCGSERIAL
= 0x541e;
1606 arm_linux_record_tdep
.ioctl_TIOCSSERIAL
= 0x541f;
1607 arm_linux_record_tdep
.ioctl_TIOCPKT
= 0x5420;
1608 arm_linux_record_tdep
.ioctl_FIONBIO
= 0x5421;
1609 arm_linux_record_tdep
.ioctl_TIOCNOTTY
= 0x5422;
1610 arm_linux_record_tdep
.ioctl_TIOCSETD
= 0x5423;
1611 arm_linux_record_tdep
.ioctl_TIOCGETD
= 0x5424;
1612 arm_linux_record_tdep
.ioctl_TCSBRKP
= 0x5425;
1613 arm_linux_record_tdep
.ioctl_TIOCTTYGSTRUCT
= 0x5426;
1614 arm_linux_record_tdep
.ioctl_TIOCSBRK
= 0x5427;
1615 arm_linux_record_tdep
.ioctl_TIOCCBRK
= 0x5428;
1616 arm_linux_record_tdep
.ioctl_TIOCGSID
= 0x5429;
1617 arm_linux_record_tdep
.ioctl_TCGETS2
= 0x802c542a;
1618 arm_linux_record_tdep
.ioctl_TCSETS2
= 0x402c542b;
1619 arm_linux_record_tdep
.ioctl_TCSETSW2
= 0x402c542c;
1620 arm_linux_record_tdep
.ioctl_TCSETSF2
= 0x402c542d;
1621 arm_linux_record_tdep
.ioctl_TIOCGPTN
= 0x80045430;
1622 arm_linux_record_tdep
.ioctl_TIOCSPTLCK
= 0x40045431;
1623 arm_linux_record_tdep
.ioctl_FIONCLEX
= 0x5450;
1624 arm_linux_record_tdep
.ioctl_FIOCLEX
= 0x5451;
1625 arm_linux_record_tdep
.ioctl_FIOASYNC
= 0x5452;
1626 arm_linux_record_tdep
.ioctl_TIOCSERCONFIG
= 0x5453;
1627 arm_linux_record_tdep
.ioctl_TIOCSERGWILD
= 0x5454;
1628 arm_linux_record_tdep
.ioctl_TIOCSERSWILD
= 0x5455;
1629 arm_linux_record_tdep
.ioctl_TIOCGLCKTRMIOS
= 0x5456;
1630 arm_linux_record_tdep
.ioctl_TIOCSLCKTRMIOS
= 0x5457;
1631 arm_linux_record_tdep
.ioctl_TIOCSERGSTRUCT
= 0x5458;
1632 arm_linux_record_tdep
.ioctl_TIOCSERGETLSR
= 0x5459;
1633 arm_linux_record_tdep
.ioctl_TIOCSERGETMULTI
= 0x545a;
1634 arm_linux_record_tdep
.ioctl_TIOCSERSETMULTI
= 0x545b;
1635 arm_linux_record_tdep
.ioctl_TIOCMIWAIT
= 0x545c;
1636 arm_linux_record_tdep
.ioctl_TIOCGICOUNT
= 0x545d;
1637 arm_linux_record_tdep
.ioctl_TIOCGHAYESESP
= 0x545e;
1638 arm_linux_record_tdep
.ioctl_TIOCSHAYESESP
= 0x545f;
1639 arm_linux_record_tdep
.ioctl_FIOQSIZE
= 0x5460;
1641 /* These values are the second argument of system call "sys_fcntl"
1642 and "sys_fcntl64". They are obtained from Linux Kernel source. */
1643 arm_linux_record_tdep
.fcntl_F_GETLK
= 5;
1644 arm_linux_record_tdep
.fcntl_F_GETLK64
= 12;
1645 arm_linux_record_tdep
.fcntl_F_SETLK64
= 13;
1646 arm_linux_record_tdep
.fcntl_F_SETLKW64
= 14;
1648 arm_linux_record_tdep
.arg1
= ARM_A1_REGNUM
+ 1;
1649 arm_linux_record_tdep
.arg2
= ARM_A1_REGNUM
+ 2;
1650 arm_linux_record_tdep
.arg3
= ARM_A1_REGNUM
+ 3;
1651 arm_linux_record_tdep
.arg4
= ARM_A1_REGNUM
+ 3;
1654 /* Provide a prototype to silence -Wmissing-prototypes. */
1655 extern initialize_file_ftype _initialize_arm_linux_tdep
;
1658 _initialize_arm_linux_tdep (void)
1660 gdbarch_register_osabi (bfd_arch_arm
, 0, GDB_OSABI_LINUX
,
1661 arm_linux_init_abi
);