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 static const unsigned long arm_breakpoint
= 0xef9f0001;
248 #define arm_breakpoint_len 4
249 static const unsigned short thumb_breakpoint
= 0xde01;
250 #define thumb_breakpoint_len 2
251 static const unsigned short thumb2_breakpoint
[] = { 0xf7f0, 0xa000 };
252 #define thumb2_breakpoint_len 4
254 /* For new EABI binaries. We recognize it regardless of which ABI
255 is used for gdbserver, so single threaded debugging should work
256 OK, but for multi-threaded debugging we only insert the current
257 ABI's breakpoint instruction. For now at least. */
258 static const unsigned long arm_eabi_breakpoint
= 0xe7f001f0;
261 arm_breakpoint_at (CORE_ADDR where
)
263 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
266 collect_register_by_name (regcache
, "cpsr", &cpsr
);
273 (*the_target
->read_memory
) (where
, (unsigned char *) &insn
, 2);
274 if (insn
== thumb_breakpoint
)
277 if (insn
== thumb2_breakpoint
[0])
279 (*the_target
->read_memory
) (where
+ 2, (unsigned char *) &insn
, 2);
280 if (insn
== thumb2_breakpoint
[1])
289 (*the_target
->read_memory
) (where
, (unsigned char *) &insn
, 4);
290 if (insn
== arm_breakpoint
)
293 if (insn
== arm_eabi_breakpoint
)
300 /* We only place breakpoints in empty marker functions, and thread locking
301 is outside of the function. So rather than importing software single-step,
302 we can just run until exit. */
304 arm_reinsert_addr (void)
306 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
308 collect_register_by_name (regcache
, "lr", &pc
);
312 /* Fetch the thread-local storage pointer for libthread_db. */
315 ps_get_thread_area (const struct ps_prochandle
*ph
,
316 lwpid_t lwpid
, int idx
, void **base
)
318 if (ptrace (PTRACE_GET_THREAD_AREA
, lwpid
, NULL
, base
) != 0)
321 /* IDX is the bias from the thread pointer to the beginning of the
322 thread descriptor. It has to be subtracted due to implementation
323 quirks in libthread_db. */
324 *base
= (void *) ((char *)*base
- idx
);
330 /* Query Hardware Breakpoint information for the target we are attached to
331 (using PID as ptrace argument) and set up arm_linux_hwbp_cap. */
333 arm_linux_init_hwbp_cap (int pid
)
337 if (ptrace (PTRACE_GETHBPREGS
, pid
, 0, &val
) < 0)
340 arm_linux_hwbp_cap
.arch
= (unsigned char)((val
>> 24) & 0xff);
341 if (arm_linux_hwbp_cap
.arch
== 0)
344 arm_linux_hwbp_cap
.max_wp_length
= (unsigned char)((val
>> 16) & 0xff);
345 arm_linux_hwbp_cap
.wp_count
= (unsigned char)((val
>> 8) & 0xff);
346 arm_linux_hwbp_cap
.bp_count
= (unsigned char)(val
& 0xff);
348 if (arm_linux_hwbp_cap
.wp_count
> MAX_WPTS
)
349 internal_error (__FILE__
, __LINE__
, "Unsupported number of watchpoints");
350 if (arm_linux_hwbp_cap
.bp_count
> MAX_BPTS
)
351 internal_error (__FILE__
, __LINE__
, "Unsupported number of breakpoints");
354 /* How many hardware breakpoints are available? */
356 arm_linux_get_hw_breakpoint_count (void)
358 return arm_linux_hwbp_cap
.bp_count
;
361 /* How many hardware watchpoints are available? */
363 arm_linux_get_hw_watchpoint_count (void)
365 return arm_linux_hwbp_cap
.wp_count
;
368 /* Maximum length of area watched by hardware watchpoint. */
370 arm_linux_get_hw_watchpoint_max_length (void)
372 return arm_linux_hwbp_cap
.max_wp_length
;
375 /* Initialize an ARM hardware break-/watch-point control register value.
376 BYTE_ADDRESS_SELECT is the mask of bytes to trigger on; HWBP_TYPE is the
377 type of break-/watch-point; ENABLE indicates whether the point is enabled.
379 static arm_hwbp_control_t
380 arm_hwbp_control_initialize (unsigned byte_address_select
,
381 arm_hwbp_type hwbp_type
,
384 gdb_assert ((byte_address_select
& ~0xffU
) == 0);
385 gdb_assert (hwbp_type
!= arm_hwbp_break
386 || ((byte_address_select
& 0xfU
) != 0));
388 return (byte_address_select
<< 5) | (hwbp_type
<< 3) | (3 << 1) | enable
;
391 /* Does the breakpoint control value CONTROL have the enable bit set? */
393 arm_hwbp_control_is_enabled (arm_hwbp_control_t control
)
395 return control
& 0x1;
398 /* Is the breakpoint control value CONTROL initialized? */
400 arm_hwbp_control_is_initialized (arm_hwbp_control_t control
)
405 /* Change a breakpoint control word so that it is in the disabled state. */
406 static arm_hwbp_control_t
407 arm_hwbp_control_disable (arm_hwbp_control_t control
)
409 return control
& ~0x1;
412 /* Are two break-/watch-points equal? */
414 arm_linux_hw_breakpoint_equal (const struct arm_linux_hw_breakpoint
*p1
,
415 const struct arm_linux_hw_breakpoint
*p2
)
417 return p1
->address
== p2
->address
&& p1
->control
== p2
->control
;
420 /* Convert a raw breakpoint type to an enum arm_hwbp_type. */
423 raw_bkpt_type_to_arm_hwbp_type (enum raw_bkpt_type raw_type
)
427 case raw_bkpt_type_hw
:
428 return arm_hwbp_break
;
429 case raw_bkpt_type_write_wp
:
430 return arm_hwbp_store
;
431 case raw_bkpt_type_read_wp
:
432 return arm_hwbp_load
;
433 case raw_bkpt_type_access_wp
:
434 return arm_hwbp_access
;
436 gdb_assert_not_reached ("unhandled raw type");
440 /* Initialize the hardware breakpoint structure P for a breakpoint or
441 watchpoint at ADDR to LEN. The type of watchpoint is given in TYPE.
442 Returns -1 if TYPE is unsupported, or -2 if the particular combination
443 of ADDR and LEN cannot be implemented. Otherwise, returns 0 if TYPE
444 represents a breakpoint and 1 if type represents a watchpoint. */
446 arm_linux_hw_point_initialize (enum raw_bkpt_type raw_type
, CORE_ADDR addr
,
447 int len
, struct arm_linux_hw_breakpoint
*p
)
449 arm_hwbp_type hwbp_type
;
452 hwbp_type
= raw_bkpt_type_to_arm_hwbp_type (raw_type
);
454 if (hwbp_type
== arm_hwbp_break
)
456 /* For breakpoints, the length field encodes the mode. */
459 case 2: /* 16-bit Thumb mode breakpoint */
460 case 3: /* 32-bit Thumb mode breakpoint */
464 case 4: /* 32-bit ARM mode breakpoint */
475 CORE_ADDR max_wp_length
= arm_linux_get_hw_watchpoint_max_length ();
476 CORE_ADDR aligned_addr
;
478 /* Can not set watchpoints for zero or negative lengths. */
481 /* The current ptrace interface can only handle watchpoints that are a
483 if ((len
& (len
- 1)) != 0)
486 /* Test that the range [ADDR, ADDR + LEN) fits into the largest address
487 range covered by a watchpoint. */
488 aligned_addr
= addr
& ~(max_wp_length
- 1);
489 if (aligned_addr
+ max_wp_length
< addr
+ len
)
492 mask
= (1 << len
) - 1;
495 p
->address
= (unsigned int) addr
;
496 p
->control
= arm_hwbp_control_initialize (mask
, hwbp_type
, 1);
498 return hwbp_type
!= arm_hwbp_break
;
501 /* Callback to mark a watch-/breakpoint to be updated in all threads of
502 the current process. */
504 struct update_registers_data
511 update_registers_callback (struct inferior_list_entry
*entry
, void *arg
)
513 struct thread_info
*thread
= (struct thread_info
*) entry
;
514 struct lwp_info
*lwp
= get_thread_lwp (thread
);
515 struct update_registers_data
*data
= (struct update_registers_data
*) arg
;
517 /* Only update the threads of the current process. */
518 if (pid_of (thread
) == pid_of (current_thread
))
520 /* The actual update is done later just before resuming the lwp,
521 we just mark that the registers need updating. */
523 lwp
->arch_private
->wpts_changed
[data
->i
] = 1;
525 lwp
->arch_private
->bpts_changed
[data
->i
] = 1;
527 /* If the lwp isn't stopped, force it to momentarily pause, so
528 we can update its breakpoint registers. */
530 linux_stop_lwp (lwp
);
537 arm_supports_z_point_type (char z_type
)
542 case Z_PACKET_WRITE_WP
:
543 case Z_PACKET_READ_WP
:
544 case Z_PACKET_ACCESS_WP
:
547 /* Leave the handling of sw breakpoints with the gdb client. */
552 /* Insert hardware break-/watchpoint. */
554 arm_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
555 int len
, struct raw_breakpoint
*bp
)
557 struct process_info
*proc
= current_process ();
558 struct arm_linux_hw_breakpoint p
, *pts
;
561 watch
= arm_linux_hw_point_initialize (type
, addr
, len
, &p
);
565 return watch
== -1 ? 1 : -1;
570 count
= arm_linux_get_hw_watchpoint_count ();
571 pts
= proc
->priv
->arch_private
->wpts
;
575 count
= arm_linux_get_hw_breakpoint_count ();
576 pts
= proc
->priv
->arch_private
->bpts
;
579 for (i
= 0; i
< count
; i
++)
580 if (!arm_hwbp_control_is_enabled (pts
[i
].control
))
582 struct update_registers_data data
= { watch
, i
};
584 find_inferior (&all_threads
, update_registers_callback
, &data
);
588 /* We're out of watchpoints. */
592 /* Remove hardware break-/watchpoint. */
594 arm_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
595 int len
, struct raw_breakpoint
*bp
)
597 struct process_info
*proc
= current_process ();
598 struct arm_linux_hw_breakpoint p
, *pts
;
601 watch
= arm_linux_hw_point_initialize (type
, addr
, len
, &p
);
610 count
= arm_linux_get_hw_watchpoint_count ();
611 pts
= proc
->priv
->arch_private
->wpts
;
615 count
= arm_linux_get_hw_breakpoint_count ();
616 pts
= proc
->priv
->arch_private
->bpts
;
619 for (i
= 0; i
< count
; i
++)
620 if (arm_linux_hw_breakpoint_equal (&p
, pts
+ i
))
622 struct update_registers_data data
= { watch
, i
};
623 pts
[i
].control
= arm_hwbp_control_disable (pts
[i
].control
);
624 find_inferior (&all_threads
, update_registers_callback
, &data
);
628 /* No watchpoint matched. */
632 /* Return whether current thread is stopped due to a watchpoint. */
634 arm_stopped_by_watchpoint (void)
636 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
639 /* We must be able to set hardware watchpoints. */
640 if (arm_linux_get_hw_watchpoint_count () == 0)
643 /* Retrieve siginfo. */
645 ptrace (PTRACE_GETSIGINFO
, lwpid_of (current_thread
), 0, &siginfo
);
649 /* This must be a hardware breakpoint. */
650 if (siginfo
.si_signo
!= SIGTRAP
651 || (siginfo
.si_code
& 0xffff) != 0x0004 /* TRAP_HWBKPT */)
654 /* If we are in a positive slot then we're looking at a breakpoint and not
656 if (siginfo
.si_errno
>= 0)
659 /* Cache stopped data address for use by arm_stopped_data_address. */
660 lwp
->arch_private
->stopped_data_address
661 = (CORE_ADDR
) (uintptr_t) siginfo
.si_addr
;
666 /* Return data address that triggered watchpoint. Called only if
667 arm_stopped_by_watchpoint returned true. */
669 arm_stopped_data_address (void)
671 struct lwp_info
*lwp
= get_thread_lwp (current_thread
);
672 return lwp
->arch_private
->stopped_data_address
;
675 /* Called when a new process is created. */
676 static struct arch_process_info
*
677 arm_new_process (void)
679 struct arch_process_info
*info
= XCNEW (struct arch_process_info
);
683 /* Called when a new thread is detected. */
685 arm_new_thread (struct lwp_info
*lwp
)
687 struct arch_lwp_info
*info
= XCNEW (struct arch_lwp_info
);
690 for (i
= 0; i
< MAX_BPTS
; i
++)
691 info
->bpts_changed
[i
] = 1;
692 for (i
= 0; i
< MAX_WPTS
; i
++)
693 info
->wpts_changed
[i
] = 1;
695 lwp
->arch_private
= info
;
699 arm_new_fork (struct process_info
*parent
, struct process_info
*child
)
701 struct arch_process_info
*parent_proc_info
= parent
->priv
->arch_private
;
702 struct arch_process_info
*child_proc_info
= child
->priv
->arch_private
;
703 struct lwp_info
*child_lwp
;
704 struct arch_lwp_info
*child_lwp_info
;
707 /* These are allocated by linux_add_process. */
708 gdb_assert (parent
->priv
!= NULL
709 && parent
->priv
->arch_private
!= NULL
);
710 gdb_assert (child
->priv
!= NULL
711 && child
->priv
->arch_private
!= NULL
);
713 /* Linux kernel before 2.6.33 commit
714 72f674d203cd230426437cdcf7dd6f681dad8b0d
715 will inherit hardware debug registers from parent
716 on fork/vfork/clone. Newer Linux kernels create such tasks with
717 zeroed debug registers.
719 GDB core assumes the child inherits the watchpoints/hw
720 breakpoints of the parent, and will remove them all from the
721 forked off process. Copy the debug registers mirrors into the
722 new process so that all breakpoints and watchpoints can be
723 removed together. The debug registers mirror will become zeroed
724 in the end before detaching the forked off process, thus making
725 this compatible with older Linux kernels too. */
727 *child_proc_info
= *parent_proc_info
;
729 /* Mark all the hardware breakpoints and watchpoints as changed to
730 make sure that the registers will be updated. */
731 child_lwp
= find_lwp_pid (ptid_of (child
));
732 child_lwp_info
= child_lwp
->arch_private
;
733 for (i
= 0; i
< MAX_BPTS
; i
++)
734 child_lwp_info
->bpts_changed
[i
] = 1;
735 for (i
= 0; i
< MAX_WPTS
; i
++)
736 child_lwp_info
->wpts_changed
[i
] = 1;
739 /* Called when resuming a thread.
740 If the debug regs have changed, update the thread's copies. */
742 arm_prepare_to_resume (struct lwp_info
*lwp
)
744 struct thread_info
*thread
= get_lwp_thread (lwp
);
745 int pid
= lwpid_of (thread
);
746 struct process_info
*proc
= find_process_pid (pid_of (thread
));
747 struct arch_process_info
*proc_info
= proc
->priv
->arch_private
;
748 struct arch_lwp_info
*lwp_info
= lwp
->arch_private
;
751 for (i
= 0; i
< arm_linux_get_hw_breakpoint_count (); i
++)
752 if (lwp_info
->bpts_changed
[i
])
756 if (arm_hwbp_control_is_enabled (proc_info
->bpts
[i
].control
))
757 if (ptrace (PTRACE_SETHBPREGS
, pid
,
758 (PTRACE_TYPE_ARG3
) ((i
<< 1) + 1),
759 &proc_info
->bpts
[i
].address
) < 0)
760 perror_with_name ("Unexpected error setting breakpoint address");
762 if (arm_hwbp_control_is_initialized (proc_info
->bpts
[i
].control
))
763 if (ptrace (PTRACE_SETHBPREGS
, pid
,
764 (PTRACE_TYPE_ARG3
) ((i
<< 1) + 2),
765 &proc_info
->bpts
[i
].control
) < 0)
766 perror_with_name ("Unexpected error setting breakpoint");
768 lwp_info
->bpts_changed
[i
] = 0;
771 for (i
= 0; i
< arm_linux_get_hw_watchpoint_count (); i
++)
772 if (lwp_info
->wpts_changed
[i
])
776 if (arm_hwbp_control_is_enabled (proc_info
->wpts
[i
].control
))
777 if (ptrace (PTRACE_SETHBPREGS
, pid
,
778 (PTRACE_TYPE_ARG3
) -((i
<< 1) + 1),
779 &proc_info
->wpts
[i
].address
) < 0)
780 perror_with_name ("Unexpected error setting watchpoint address");
782 if (arm_hwbp_control_is_initialized (proc_info
->wpts
[i
].control
))
783 if (ptrace (PTRACE_SETHBPREGS
, pid
,
784 (PTRACE_TYPE_ARG3
) -((i
<< 1) + 2),
785 &proc_info
->wpts
[i
].control
) < 0)
786 perror_with_name ("Unexpected error setting watchpoint");
788 lwp_info
->wpts_changed
[i
] = 0;
794 arm_get_hwcap (unsigned long *valp
)
796 unsigned char *data
= alloca (8);
799 while ((*the_target
->read_auxv
) (offset
, data
, 8) == 8)
801 unsigned int *data_p
= (unsigned int *)data
;
802 if (data_p
[0] == AT_HWCAP
)
815 static const struct target_desc
*
816 arm_read_description (void)
818 int pid
= lwpid_of (current_thread
);
819 unsigned long arm_hwcap
= 0;
821 /* Query hardware watchpoint/breakpoint capabilities. */
822 arm_linux_init_hwbp_cap (pid
);
824 if (arm_get_hwcap (&arm_hwcap
) == 0)
827 if (arm_hwcap
& HWCAP_IWMMXT
)
828 return tdesc_arm_with_iwmmxt
;
830 if (arm_hwcap
& HWCAP_VFP
)
832 const struct target_desc
*result
;
835 /* NEON implies either no VFP, or VFPv3-D32. We only support
837 if (arm_hwcap
& HWCAP_NEON
)
838 result
= tdesc_arm_with_neon
;
839 else if ((arm_hwcap
& (HWCAP_VFPv3
| HWCAP_VFPv3D16
)) == HWCAP_VFPv3
)
840 result
= tdesc_arm_with_vfpv3
;
842 result
= tdesc_arm_with_vfpv2
;
844 /* Now make sure that the kernel supports reading these
845 registers. Support was added in 2.6.30. */
847 buf
= xmalloc (32 * 8 + 4);
848 if (ptrace (PTRACE_GETVFPREGS
, pid
, 0, buf
) < 0
857 /* The default configuration uses legacy FPA registers, probably
863 arm_arch_setup (void)
865 int tid
= lwpid_of (current_thread
);
869 current_process ()->tdesc
= arm_read_description ();
871 iov
.iov_base
= gpregs
;
872 iov
.iov_len
= sizeof (gpregs
);
874 /* Check if PTRACE_GETREGSET works. */
875 if (ptrace (PTRACE_GETREGSET
, tid
, NT_PRSTATUS
, &iov
) == 0)
876 have_ptrace_getregset
= 1;
878 have_ptrace_getregset
= 0;
881 /* Register sets without using PTRACE_GETREGSET. */
883 static struct regset_info arm_regsets
[] = {
884 { PTRACE_GETREGS
, PTRACE_SETREGS
, 0, 18 * 4,
886 arm_fill_gregset
, arm_store_gregset
},
887 { PTRACE_GETWMMXREGS
, PTRACE_SETWMMXREGS
, 0, 16 * 8 + 6 * 4,
889 arm_fill_wmmxregset
, arm_store_wmmxregset
},
890 { PTRACE_GETVFPREGS
, PTRACE_SETVFPREGS
, 0, 32 * 8 + 4,
892 arm_fill_vfpregset
, arm_store_vfpregset
},
893 { 0, 0, 0, -1, -1, NULL
, NULL
}
896 static struct regsets_info arm_regsets_info
=
898 arm_regsets
, /* regsets */
900 NULL
, /* disabled_regsets */
903 static struct usrregs_info arm_usrregs_info
=
909 static struct regs_info regs_info_arm
=
911 NULL
, /* regset_bitmap */
916 static const struct regs_info
*
919 const struct target_desc
*tdesc
= current_process ()->tdesc
;
921 if (have_ptrace_getregset
== 1
922 && (tdesc
== tdesc_arm_with_neon
|| tdesc
== tdesc_arm_with_vfpv3
))
923 return ®s_info_aarch32
;
925 return ®s_info_arm
;
928 /* Implementation of linux_target_ops method "breakpoint_kind_from_pc".
930 Determine the type and size of breakpoint to insert at PCPTR. Uses the
931 program counter value to determine whether a 16-bit or 32-bit breakpoint
932 should be used. It returns the breakpoint's kind, and adjusts the program
933 counter (if necessary) to point to the actual memory location where the
934 breakpoint should be inserted. */
937 arm_breakpoint_kind_from_pc (CORE_ADDR
*pcptr
)
939 if (IS_THUMB_ADDR (*pcptr
))
943 *pcptr
= UNMAKE_THUMB_ADDR (*pcptr
);
945 /* Check whether we are replacing a thumb2 32-bit instruction. */
946 if ((*the_target
->read_memory
) (*pcptr
, buf
, 2) == 0)
948 unsigned short inst1
= 0;
950 (*the_target
->read_memory
) (*pcptr
, (gdb_byte
*) &inst1
, 2);
951 if (thumb_insn_size (inst1
) == 4)
952 return ARM_BP_KIND_THUMB2
;
954 return ARM_BP_KIND_THUMB
;
957 return ARM_BP_KIND_ARM
;
960 /* Implementation of the linux_target_ops method "sw_breakpoint_from_kind". */
962 static const gdb_byte
*
963 arm_sw_breakpoint_from_kind (int kind
, int *size
)
965 *size
= arm_breakpoint_len
;
966 /* Define an ARM-mode breakpoint; we only set breakpoints in the C
967 library, which is most likely to be ARM. If the kernel supports
968 clone events, we will never insert a breakpoint, so even a Thumb
969 C library will work; so will mixing EABI/non-EABI gdbserver and
973 case ARM_BP_KIND_THUMB
:
974 *size
= thumb_breakpoint_len
;
975 return (gdb_byte
*) &thumb_breakpoint
;
976 case ARM_BP_KIND_THUMB2
:
977 *size
= thumb2_breakpoint_len
;
978 return (gdb_byte
*) &thumb2_breakpoint
;
979 case ARM_BP_KIND_ARM
:
980 *size
= arm_breakpoint_len
;
982 return (const gdb_byte
*) &arm_breakpoint
;
984 return (const gdb_byte
*) &arm_eabi_breakpoint
;
992 struct linux_target_ops the_low_target
= {
995 arm_cannot_fetch_register
,
996 arm_cannot_store_register
,
997 NULL
, /* fetch_register */
1000 arm_breakpoint_kind_from_pc
,
1001 arm_sw_breakpoint_from_kind
,
1005 arm_supports_z_point_type
,
1008 arm_stopped_by_watchpoint
,
1009 arm_stopped_data_address
,
1010 NULL
, /* collect_ptrace_register */
1011 NULL
, /* supply_ptrace_register */
1012 NULL
, /* siginfo_fixup */
1016 arm_prepare_to_resume
,
1020 initialize_low_arch (void)
1022 /* Initialize the Linux target descriptions. */
1023 init_registers_arm ();
1024 init_registers_arm_with_iwmmxt ();
1025 init_registers_arm_with_vfpv2 ();
1026 init_registers_arm_with_vfpv3 ();
1028 initialize_low_arch_aarch32 ();
1030 initialize_regsets_info (&arm_regsets_info
);