1 /* GNU/Linux/ARM specific low level interface, for the remote server for GDB.
2 Copyright (C) 1995-2015 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
20 #include "linux-low.h"
22 #include "linux-aarch32-low.h"
25 /* Don't include elf.h if linux/elf.h got included by gdb_proc_service.h.
26 On Bionic elf.h and linux/elf.h have conflicting definitions. */
30 #include "nat/gdb_ptrace.h"
35 /* Defined in auto-generated files. */
36 void init_registers_arm (void);
37 extern const struct target_desc
*tdesc_arm
;
39 void init_registers_arm_with_iwmmxt (void);
40 extern const struct target_desc
*tdesc_arm_with_iwmmxt
;
42 void init_registers_arm_with_vfpv2 (void);
43 extern const struct target_desc
*tdesc_arm_with_vfpv2
;
45 void init_registers_arm_with_vfpv3 (void);
46 extern const struct target_desc
*tdesc_arm_with_vfpv3
;
48 #ifndef PTRACE_GET_THREAD_AREA
49 #define PTRACE_GET_THREAD_AREA 22
52 #ifndef PTRACE_GETWMMXREGS
53 # define PTRACE_GETWMMXREGS 18
54 # define PTRACE_SETWMMXREGS 19
57 #ifndef PTRACE_GETVFPREGS
58 # define PTRACE_GETVFPREGS 27
59 # define PTRACE_SETVFPREGS 28
62 #ifndef PTRACE_GETHBPREGS
63 #define PTRACE_GETHBPREGS 29
64 #define PTRACE_SETHBPREGS 30
67 /* Information describing the hardware breakpoint capabilities. */
71 unsigned char max_wp_length
;
72 unsigned char wp_count
;
73 unsigned char bp_count
;
76 /* Enum describing the different types of ARM hardware break-/watch-points. */
85 /* Enum describing the different kinds of breakpoints. */
86 enum arm_breakpoint_kinds
88 ARM_BP_KIND_THUMB
= 2,
89 ARM_BP_KIND_THUMB2
= 3,
93 /* Type describing an ARM Hardware Breakpoint Control register value. */
94 typedef unsigned int arm_hwbp_control_t
;
96 /* Structure used to keep track of hardware break-/watch-points. */
97 struct arm_linux_hw_breakpoint
99 /* Address to break on, or being watched. */
100 unsigned int address
;
101 /* Control register for break-/watch- point. */
102 arm_hwbp_control_t control
;
105 /* Since we cannot dynamically allocate subfields of arch_process_info,
106 assume a maximum number of supported break-/watchpoints. */
110 /* Per-process arch-specific data we want to keep. */
111 struct arch_process_info
113 /* Hardware breakpoints for this process. */
114 struct arm_linux_hw_breakpoint bpts
[MAX_BPTS
];
115 /* Hardware watchpoints for this process. */
116 struct arm_linux_hw_breakpoint wpts
[MAX_WPTS
];
119 /* Per-thread arch-specific data we want to keep. */
122 /* Non-zero if our copy differs from what's recorded in the thread. */
123 char bpts_changed
[MAX_BPTS
];
124 char wpts_changed
[MAX_WPTS
];
125 /* Cached stopped data address. */
126 CORE_ADDR stopped_data_address
;
129 /* These are in <asm/elf.h> in current kernels. */
131 #define HWCAP_IWMMXT 512
132 #define HWCAP_NEON 4096
133 #define HWCAP_VFPv3 8192
134 #define HWCAP_VFPv3D16 16384
136 #ifdef HAVE_SYS_REG_H
140 #define arm_num_regs 26
142 static int arm_regmap
[] = {
143 0, 4, 8, 12, 16, 20, 24, 28,
144 32, 36, 40, 44, 48, 52, 56, 60,
145 -1, -1, -1, -1, -1, -1, -1, -1, -1,
150 arm_cannot_store_register (int regno
)
152 return (regno
>= arm_num_regs
);
156 arm_cannot_fetch_register (int regno
)
158 return (regno
>= arm_num_regs
);
162 arm_fill_wmmxregset (struct regcache
*regcache
, void *buf
)
166 if (regcache
->tdesc
!= tdesc_arm_with_iwmmxt
)
169 for (i
= 0; i
< 16; i
++)
170 collect_register (regcache
, arm_num_regs
+ i
, (char *) buf
+ i
* 8);
172 /* We only have access to wcssf, wcasf, and wcgr0-wcgr3. */
173 for (i
= 0; i
< 6; i
++)
174 collect_register (regcache
, arm_num_regs
+ i
+ 16,
175 (char *) buf
+ 16 * 8 + i
* 4);
179 arm_store_wmmxregset (struct regcache
*regcache
, const void *buf
)
183 if (regcache
->tdesc
!= tdesc_arm_with_iwmmxt
)
186 for (i
= 0; i
< 16; i
++)
187 supply_register (regcache
, arm_num_regs
+ i
, (char *) buf
+ i
* 8);
189 /* We only have access to wcssf, wcasf, and wcgr0-wcgr3. */
190 for (i
= 0; i
< 6; i
++)
191 supply_register (regcache
, arm_num_regs
+ i
+ 16,
192 (char *) buf
+ 16 * 8 + i
* 4);
196 arm_fill_vfpregset (struct regcache
*regcache
, void *buf
)
200 if (regcache
->tdesc
== tdesc_arm_with_neon
201 || regcache
->tdesc
== tdesc_arm_with_vfpv3
)
203 else if (regcache
->tdesc
== tdesc_arm_with_vfpv2
)
208 arm_fill_vfpregset_num (regcache
, buf
, num
);
212 arm_store_vfpregset (struct regcache
*regcache
, const void *buf
)
216 if (regcache
->tdesc
== tdesc_arm_with_neon
217 || regcache
->tdesc
== tdesc_arm_with_vfpv3
)
219 else if (regcache
->tdesc
== tdesc_arm_with_vfpv2
)
224 arm_store_vfpregset_num (regcache
, buf
, num
);
227 extern int debug_threads
;
230 arm_get_pc (struct regcache
*regcache
)
233 collect_register_by_name (regcache
, "pc", &pc
);
235 debug_printf ("stop pc is %08lx\n", pc
);
240 arm_set_pc (struct regcache
*regcache
, CORE_ADDR pc
)
242 unsigned long newpc
= pc
;
243 supply_register_by_name (regcache
, "pc", &newpc
);
246 /* Correct in either endianness. */
247 #define arm_abi_breakpoint 0xef9f0001UL
249 /* For new EABI binaries. We recognize it regardless of which ABI
250 is used for gdbserver, so single threaded debugging should work
251 OK, but for multi-threaded debugging we only insert the current
252 ABI's breakpoint instruction. For now at least. */
253 #define arm_eabi_breakpoint 0xe7f001f0UL
256 static const unsigned long arm_breakpoint
= arm_abi_breakpoint
;
258 static const unsigned long arm_breakpoint
= arm_eabi_breakpoint
;
261 #define arm_breakpoint_len 4
262 static const unsigned short thumb_breakpoint
= 0xde01;
263 #define thumb_breakpoint_len 2
264 static const unsigned short thumb2_breakpoint
[] = { 0xf7f0, 0xa000 };
265 #define thumb2_breakpoint_len 4
268 arm_breakpoint_at (CORE_ADDR where
)
270 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
273 collect_register_by_name (regcache
, "cpsr", &cpsr
);
280 (*the_target
->read_memory
) (where
, (unsigned char *) &insn
, 2);
281 if (insn
== thumb_breakpoint
)
284 if (insn
== thumb2_breakpoint
[0])
286 (*the_target
->read_memory
) (where
+ 2, (unsigned char *) &insn
, 2);
287 if (insn
== thumb2_breakpoint
[1])
296 (*the_target
->read_memory
) (where
, (unsigned char *) &insn
, 4);
297 if (insn
== arm_abi_breakpoint
)
300 if (insn
== arm_eabi_breakpoint
)
307 /* We only place breakpoints in empty marker functions, and thread locking
308 is outside of the function. So rather than importing software single-step,
309 we can just run until exit. */
311 arm_reinsert_addr (void)
313 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
315 collect_register_by_name (regcache
, "lr", &pc
);
319 /* Fetch the thread-local storage pointer for libthread_db. */
322 ps_get_thread_area (const struct ps_prochandle
*ph
,
323 lwpid_t lwpid
, int idx
, void **base
)
325 if (ptrace (PTRACE_GET_THREAD_AREA
, lwpid
, NULL
, base
) != 0)
328 /* IDX is the bias from the thread pointer to the beginning of the
329 thread descriptor. It has to be subtracted due to implementation
330 quirks in libthread_db. */
331 *base
= (void *) ((char *)*base
- idx
);
337 /* Query Hardware Breakpoint information for the target we are attached to
338 (using PID as ptrace argument) and set up arm_linux_hwbp_cap. */
340 arm_linux_init_hwbp_cap (int pid
)
344 if (ptrace (PTRACE_GETHBPREGS
, pid
, 0, &val
) < 0)
347 arm_linux_hwbp_cap
.arch
= (unsigned char)((val
>> 24) & 0xff);
348 if (arm_linux_hwbp_cap
.arch
== 0)
351 arm_linux_hwbp_cap
.max_wp_length
= (unsigned char)((val
>> 16) & 0xff);
352 arm_linux_hwbp_cap
.wp_count
= (unsigned char)((val
>> 8) & 0xff);
353 arm_linux_hwbp_cap
.bp_count
= (unsigned char)(val
& 0xff);
355 if (arm_linux_hwbp_cap
.wp_count
> MAX_WPTS
)
356 internal_error (__FILE__
, __LINE__
, "Unsupported number of watchpoints");
357 if (arm_linux_hwbp_cap
.bp_count
> MAX_BPTS
)
358 internal_error (__FILE__
, __LINE__
, "Unsupported number of breakpoints");
361 /* How many hardware breakpoints are available? */
363 arm_linux_get_hw_breakpoint_count (void)
365 return arm_linux_hwbp_cap
.bp_count
;
368 /* How many hardware watchpoints are available? */
370 arm_linux_get_hw_watchpoint_count (void)
372 return arm_linux_hwbp_cap
.wp_count
;
375 /* Maximum length of area watched by hardware watchpoint. */
377 arm_linux_get_hw_watchpoint_max_length (void)
379 return arm_linux_hwbp_cap
.max_wp_length
;
382 /* Initialize an ARM hardware break-/watch-point control register value.
383 BYTE_ADDRESS_SELECT is the mask of bytes to trigger on; HWBP_TYPE is the
384 type of break-/watch-point; ENABLE indicates whether the point is enabled.
386 static arm_hwbp_control_t
387 arm_hwbp_control_initialize (unsigned byte_address_select
,
388 arm_hwbp_type hwbp_type
,
391 gdb_assert ((byte_address_select
& ~0xffU
) == 0);
392 gdb_assert (hwbp_type
!= arm_hwbp_break
393 || ((byte_address_select
& 0xfU
) != 0));
395 return (byte_address_select
<< 5) | (hwbp_type
<< 3) | (3 << 1) | enable
;
398 /* Does the breakpoint control value CONTROL have the enable bit set? */
400 arm_hwbp_control_is_enabled (arm_hwbp_control_t control
)
402 return control
& 0x1;
405 /* Is the breakpoint control value CONTROL initialized? */
407 arm_hwbp_control_is_initialized (arm_hwbp_control_t control
)
412 /* Change a breakpoint control word so that it is in the disabled state. */
413 static arm_hwbp_control_t
414 arm_hwbp_control_disable (arm_hwbp_control_t control
)
416 return control
& ~0x1;
419 /* Are two break-/watch-points equal? */
421 arm_linux_hw_breakpoint_equal (const struct arm_linux_hw_breakpoint
*p1
,
422 const struct arm_linux_hw_breakpoint
*p2
)
424 return p1
->address
== p2
->address
&& p1
->control
== p2
->control
;
427 /* Convert a raw breakpoint type to an enum arm_hwbp_type. */
430 raw_bkpt_type_to_arm_hwbp_type (enum raw_bkpt_type raw_type
)
434 case raw_bkpt_type_hw
:
435 return arm_hwbp_break
;
436 case raw_bkpt_type_write_wp
:
437 return arm_hwbp_store
;
438 case raw_bkpt_type_read_wp
:
439 return arm_hwbp_load
;
440 case raw_bkpt_type_access_wp
:
441 return arm_hwbp_access
;
443 gdb_assert_not_reached ("unhandled raw type");
447 /* Initialize the hardware breakpoint structure P for a breakpoint or
448 watchpoint at ADDR to LEN. The type of watchpoint is given in TYPE.
449 Returns -1 if TYPE is unsupported, or -2 if the particular combination
450 of ADDR and LEN cannot be implemented. Otherwise, returns 0 if TYPE
451 represents a breakpoint and 1 if type represents a watchpoint. */
453 arm_linux_hw_point_initialize (enum raw_bkpt_type raw_type
, CORE_ADDR addr
,
454 int len
, struct arm_linux_hw_breakpoint
*p
)
456 arm_hwbp_type hwbp_type
;
459 hwbp_type
= raw_bkpt_type_to_arm_hwbp_type (raw_type
);
461 if (hwbp_type
== arm_hwbp_break
)
463 /* For breakpoints, the length field encodes the mode. */
466 case 2: /* 16-bit Thumb mode breakpoint */
467 case 3: /* 32-bit Thumb mode breakpoint */
471 case 4: /* 32-bit ARM mode breakpoint */
482 CORE_ADDR max_wp_length
= arm_linux_get_hw_watchpoint_max_length ();
483 CORE_ADDR aligned_addr
;
485 /* Can not set watchpoints for zero or negative lengths. */
488 /* The current ptrace interface can only handle watchpoints that are a
490 if ((len
& (len
- 1)) != 0)
493 /* Test that the range [ADDR, ADDR + LEN) fits into the largest address
494 range covered by a watchpoint. */
495 aligned_addr
= addr
& ~(max_wp_length
- 1);
496 if (aligned_addr
+ max_wp_length
< addr
+ len
)
499 mask
= (1 << len
) - 1;
502 p
->address
= (unsigned int) addr
;
503 p
->control
= arm_hwbp_control_initialize (mask
, hwbp_type
, 1);
505 return hwbp_type
!= arm_hwbp_break
;
508 /* Callback to mark a watch-/breakpoint to be updated in all threads of
509 the current process. */
511 struct update_registers_data
518 update_registers_callback (struct inferior_list_entry
*entry
, void *arg
)
520 struct thread_info
*thread
= (struct thread_info
*) entry
;
521 struct lwp_info
*lwp
= get_thread_lwp (thread
);
522 struct update_registers_data
*data
= (struct update_registers_data
*) arg
;
524 /* Only update the threads of the current process. */
525 if (pid_of (thread
) == pid_of (current_thread
))
527 /* The actual update is done later just before resuming the lwp,
528 we just mark that the registers need updating. */
530 lwp
->arch_private
->wpts_changed
[data
->i
] = 1;
532 lwp
->arch_private
->bpts_changed
[data
->i
] = 1;
534 /* If the lwp isn't stopped, force it to momentarily pause, so
535 we can update its breakpoint registers. */
537 linux_stop_lwp (lwp
);
544 arm_supports_z_point_type (char z_type
)
549 case Z_PACKET_WRITE_WP
:
550 case Z_PACKET_READ_WP
:
551 case Z_PACKET_ACCESS_WP
:
554 /* Leave the handling of sw breakpoints with the gdb client. */
559 /* Insert hardware break-/watchpoint. */
561 arm_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
562 int len
, struct raw_breakpoint
*bp
)
564 struct process_info
*proc
= current_process ();
565 struct arm_linux_hw_breakpoint p
, *pts
;
568 watch
= arm_linux_hw_point_initialize (type
, addr
, len
, &p
);
572 return watch
== -1 ? 1 : -1;
577 count
= arm_linux_get_hw_watchpoint_count ();
578 pts
= proc
->priv
->arch_private
->wpts
;
582 count
= arm_linux_get_hw_breakpoint_count ();
583 pts
= proc
->priv
->arch_private
->bpts
;
586 for (i
= 0; i
< count
; i
++)
587 if (!arm_hwbp_control_is_enabled (pts
[i
].control
))
589 struct update_registers_data data
= { watch
, i
};
591 find_inferior (&all_threads
, update_registers_callback
, &data
);
595 /* We're out of watchpoints. */
599 /* Remove hardware break-/watchpoint. */
601 arm_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
602 int len
, struct raw_breakpoint
*bp
)
604 struct process_info
*proc
= current_process ();
605 struct arm_linux_hw_breakpoint p
, *pts
;
608 watch
= arm_linux_hw_point_initialize (type
, addr
, len
, &p
);
617 count
= arm_linux_get_hw_watchpoint_count ();
618 pts
= proc
->priv
->arch_private
->wpts
;
622 count
= arm_linux_get_hw_breakpoint_count ();
623 pts
= proc
->priv
->arch_private
->bpts
;
626 for (i
= 0; i
< count
; i
++)
627 if (arm_linux_hw_breakpoint_equal (&p
, pts
+ i
))
629 struct update_registers_data data
= { watch
, i
};
630 pts
[i
].control
= arm_hwbp_control_disable (pts
[i
].control
);
631 find_inferior (&all_threads
, update_registers_callback
, &data
);
635 /* No watchpoint matched. */
639 /* Return whether current thread is stopped due to a watchpoint. */
641 arm_stopped_by_watchpoint (void)
643 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
646 /* We must be able to set hardware watchpoints. */
647 if (arm_linux_get_hw_watchpoint_count () == 0)
650 /* Retrieve siginfo. */
652 ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
), 0, &siginfo
);
656 /* This must be a hardware breakpoint. */
657 if (siginfo
.si_signo
!= SIGTRAP
658 || (siginfo
.si_code
& 0xffff) != 0x0004 /* TRAP_HWBKPT */)
661 /* If we are in a positive slot then we're looking at a breakpoint and not
663 if (siginfo
.si_errno
>= 0)
666 /* Cache stopped data address for use by arm_stopped_data_address. */
667 lwp
->arch_private
->stopped_data_address
668 = (CORE_ADDR
) (uintptr_t) siginfo
.si_addr
;
673 /* Return data address that triggered watchpoint. Called only if
674 arm_stopped_by_watchpoint returned true. */
676 arm_stopped_data_address (void)
678 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
679 return lwp
->arch_private
->stopped_data_address
;
682 /* Called when a new process is created. */
683 static struct arch_process_info
*
684 arm_new_process (void)
686 struct arch_process_info
*info
= XCNEW (struct arch_process_info
);
690 /* Called when a new thread is detected. */
692 arm_new_thread (struct lwp_info
*lwp
)
694 struct arch_lwp_info
*info
= XCNEW (struct arch_lwp_info
);
697 for (i
= 0; i
< MAX_BPTS
; i
++)
698 info
->bpts_changed
[i
] = 1;
699 for (i
= 0; i
< MAX_WPTS
; i
++)
700 info
->wpts_changed
[i
] = 1;
702 lwp
->arch_private
= info
;
706 arm_new_fork (struct process_info
*parent
, struct process_info
*child
)
708 struct arch_process_info
*parent_proc_info
= parent
->priv
->arch_private
;
709 struct arch_process_info
*child_proc_info
= child
->priv
->arch_private
;
710 struct lwp_info
*child_lwp
;
711 struct arch_lwp_info
*child_lwp_info
;
714 /* These are allocated by linux_add_process. */
715 gdb_assert (parent
->priv
!= NULL
716 && parent
->priv
->arch_private
!= NULL
);
717 gdb_assert (child
->priv
!= NULL
718 && child
->priv
->arch_private
!= NULL
);
720 /* Linux kernel before 2.6.33 commit
721 72f674d203cd230426437cdcf7dd6f681dad8b0d
722 will inherit hardware debug registers from parent
723 on fork/vfork/clone. Newer Linux kernels create such tasks with
724 zeroed debug registers.
726 GDB core assumes the child inherits the watchpoints/hw
727 breakpoints of the parent, and will remove them all from the
728 forked off process. Copy the debug registers mirrors into the
729 new process so that all breakpoints and watchpoints can be
730 removed together. The debug registers mirror will become zeroed
731 in the end before detaching the forked off process, thus making
732 this compatible with older Linux kernels too. */
734 *child_proc_info
= *parent_proc_info
;
736 /* Mark all the hardware breakpoints and watchpoints as changed to
737 make sure that the registers will be updated. */
738 child_lwp
= find_lwp_pid (ptid_of (child
));
739 child_lwp_info
= child_lwp
->arch_private
;
740 for (i
= 0; i
< MAX_BPTS
; i
++)
741 child_lwp_info
->bpts_changed
[i
] = 1;
742 for (i
= 0; i
< MAX_WPTS
; i
++)
743 child_lwp_info
->wpts_changed
[i
] = 1;
746 /* Called when resuming a thread.
747 If the debug regs have changed, update the thread's copies. */
749 arm_prepare_to_resume (struct lwp_info
*lwp
)
751 struct thread_info
*thread
= get_lwp_thread (lwp
);
752 int pid
= lwpid_of (thread
);
753 struct process_info
*proc
= find_process_pid (pid_of (thread
));
754 struct arch_process_info
*proc_info
= proc
->priv
->arch_private
;
755 struct arch_lwp_info
*lwp_info
= lwp
->arch_private
;
758 for (i
= 0; i
< arm_linux_get_hw_breakpoint_count (); i
++)
759 if (lwp_info
->bpts_changed
[i
])
763 if (arm_hwbp_control_is_enabled (proc_info
->bpts
[i
].control
))
764 if (ptrace (PTRACE_SETHBPREGS
, pid
,
765 (PTRACE_TYPE_ARG3
) ((i
<< 1) + 1),
766 &proc_info
->bpts
[i
].address
) < 0)
767 perror_with_name ("Unexpected error setting breakpoint address");
769 if (arm_hwbp_control_is_initialized (proc_info
->bpts
[i
].control
))
770 if (ptrace (PTRACE_SETHBPREGS
, pid
,
771 (PTRACE_TYPE_ARG3
) ((i
<< 1) + 2),
772 &proc_info
->bpts
[i
].control
) < 0)
773 perror_with_name ("Unexpected error setting breakpoint");
775 lwp_info
->bpts_changed
[i
] = 0;
778 for (i
= 0; i
< arm_linux_get_hw_watchpoint_count (); i
++)
779 if (lwp_info
->wpts_changed
[i
])
783 if (arm_hwbp_control_is_enabled (proc_info
->wpts
[i
].control
))
784 if (ptrace (PTRACE_SETHBPREGS
, pid
,
785 (PTRACE_TYPE_ARG3
) -((i
<< 1) + 1),
786 &proc_info
->wpts
[i
].address
) < 0)
787 perror_with_name ("Unexpected error setting watchpoint address");
789 if (arm_hwbp_control_is_initialized (proc_info
->wpts
[i
].control
))
790 if (ptrace (PTRACE_SETHBPREGS
, pid
,
791 (PTRACE_TYPE_ARG3
) -((i
<< 1) + 2),
792 &proc_info
->wpts
[i
].control
) < 0)
793 perror_with_name ("Unexpected error setting watchpoint");
795 lwp_info
->wpts_changed
[i
] = 0;
801 arm_get_hwcap (unsigned long *valp
)
803 unsigned char *data
= alloca (8);
806 while ((*the_target
->read_auxv
) (offset
, data
, 8) == 8)
808 unsigned int *data_p
= (unsigned int *)data
;
809 if (data_p
[0] == AT_HWCAP
)
822 static const struct target_desc
*
823 arm_read_description (void)
825 int pid
= lwpid_of (current_thread
);
826 unsigned long arm_hwcap
= 0;
828 /* Query hardware watchpoint/breakpoint capabilities. */
829 arm_linux_init_hwbp_cap (pid
);
831 if (arm_get_hwcap (&arm_hwcap
) == 0)
834 if (arm_hwcap
& HWCAP_IWMMXT
)
835 return tdesc_arm_with_iwmmxt
;
837 if (arm_hwcap
& HWCAP_VFP
)
839 const struct target_desc
*result
;
842 /* NEON implies either no VFP, or VFPv3-D32. We only support
844 if (arm_hwcap
& HWCAP_NEON
)
845 result
= tdesc_arm_with_neon
;
846 else if ((arm_hwcap
& (HWCAP_VFPv3
| HWCAP_VFPv3D16
)) == HWCAP_VFPv3
)
847 result
= tdesc_arm_with_vfpv3
;
849 result
= tdesc_arm_with_vfpv2
;
851 /* Now make sure that the kernel supports reading these
852 registers. Support was added in 2.6.30. */
854 buf
= xmalloc (32 * 8 + 4);
855 if (ptrace (PTRACE_GETVFPREGS
, pid
, 0, buf
) < 0
864 /* The default configuration uses legacy FPA registers, probably
870 arm_arch_setup (void)
872 int tid
= lwpid_of (current_thread
);
876 current_process ()->tdesc
= arm_read_description ();
878 iov
.iov_base
= gpregs
;
879 iov
.iov_len
= sizeof (gpregs
);
881 /* Check if PTRACE_GETREGSET works. */
882 if (ptrace (PTRACE_GETREGSET
, tid
, NT_PRSTATUS
, &iov
) == 0)
883 have_ptrace_getregset
= 1;
885 have_ptrace_getregset
= 0;
888 /* Register sets without using PTRACE_GETREGSET. */
890 static struct regset_info arm_regsets
[] = {
891 { PTRACE_GETREGS
, PTRACE_SETREGS
, 0, 18 * 4,
893 arm_fill_gregset
, arm_store_gregset
},
894 { PTRACE_GETWMMXREGS
, PTRACE_SETWMMXREGS
, 0, 16 * 8 + 6 * 4,
896 arm_fill_wmmxregset
, arm_store_wmmxregset
},
897 { PTRACE_GETVFPREGS
, PTRACE_SETVFPREGS
, 0, 32 * 8 + 4,
899 arm_fill_vfpregset
, arm_store_vfpregset
},
900 { 0, 0, 0, -1, -1, NULL
, NULL
}
903 static struct regsets_info arm_regsets_info
=
905 arm_regsets
, /* regsets */
907 NULL
, /* disabled_regsets */
910 static struct usrregs_info arm_usrregs_info
=
916 static struct regs_info regs_info_arm
=
918 NULL
, /* regset_bitmap */
923 static const struct regs_info
*
926 const struct target_desc
*tdesc
= current_process ()->tdesc
;
928 if (have_ptrace_getregset
== 1
929 && (tdesc
== tdesc_arm_with_neon
|| tdesc
== tdesc_arm_with_vfpv3
))
930 return ®s_info_aarch32
;
932 return ®s_info_arm
;
935 /* Implementation of linux_target_ops method "breakpoint_kind_from_pc".
937 Determine the type and size of breakpoint to insert at PCPTR. Uses the
938 program counter value to determine whether a 16-bit or 32-bit breakpoint
939 should be used. It returns the breakpoint's kind, and adjusts the program
940 counter (if necessary) to point to the actual memory location where the
941 breakpoint should be inserted. */
944 arm_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
946 if (IS_THUMB_ADDR (*pcptr
))
950 *pcptr
= UNMAKE_THUMB_ADDR (*pcptr
);
952 /* Check whether we are replacing a thumb2 32-bit instruction. */
953 if ((*the_target
->read_memory
) (*pcptr
, buf
, 2) == 0)
955 unsigned short inst1
= 0;
957 (*the_target
->read_memory
) (*pcptr
, (gdb_byte
*) &inst1
, 2);
958 if (thumb_insn_size (inst1
) == 4)
959 return ARM_BP_KIND_THUMB2
;
961 return ARM_BP_KIND_THUMB
;
964 return ARM_BP_KIND_ARM
;
967 /* Implementation of the linux_target_ops method "sw_breakpoint_from_kind". */
969 static const gdb_byte
*
970 arm_sw_breakpoint_from_kind (int kind
, int *size
)
972 *size
= arm_breakpoint_len
;
973 /* Define an ARM-mode breakpoint; we only set breakpoints in the C
974 library, which is most likely to be ARM. If the kernel supports
975 clone events, we will never insert a breakpoint, so even a Thumb
976 C library will work; so will mixing EABI/non-EABI gdbserver and
980 case ARM_BP_KIND_THUMB
:
981 *size
= thumb_breakpoint_len
;
982 return (gdb_byte
*) &thumb_breakpoint
;
983 case ARM_BP_KIND_THUMB2
:
984 *size
= thumb2_breakpoint_len
;
985 return (gdb_byte
*) &thumb2_breakpoint
;
986 case ARM_BP_KIND_ARM
:
987 *size
= arm_breakpoint_len
;
988 return (const gdb_byte
*) &arm_breakpoint
;
995 struct linux_target_ops the_low_target
= {
998 arm_cannot_fetch_register
,
999 arm_cannot_store_register
,
1000 NULL
, /* fetch_register */
1003 arm_breakpoint_kind_from_pc
,
1004 arm_sw_breakpoint_from_kind
,
1008 arm_supports_z_point_type
,
1011 arm_stopped_by_watchpoint
,
1012 arm_stopped_data_address
,
1013 NULL
, /* collect_ptrace_register */
1014 NULL
, /* supply_ptrace_register */
1015 NULL
, /* siginfo_fixup */
1019 arm_prepare_to_resume
,
1023 initialize_low_arch (void)
1025 /* Initialize the Linux target descriptions. */
1026 init_registers_arm ();
1027 init_registers_arm_with_iwmmxt ();
1028 init_registers_arm_with_vfpv2 ();
1029 init_registers_arm_with_vfpv3 ();
1031 initialize_low_arch_aarch32 ();
1033 initialize_regsets_info (&arm_regsets_info
);