1 /* GNU/Linux/CRIS specific low level interface, for the remote server for GDB.
2 Copyright (C) 1995-2020 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"
21 #include "nat/gdb_ptrace.h"
23 /* Linux target op definitions for the CRIS architecture. */
25 class crisv32_target
: public linux_process_target
29 const regs_info
*get_regs_info () override
;
33 void low_arch_setup () override
;
35 bool low_cannot_fetch_register (int regno
) override
;
37 bool low_cannot_store_register (int regno
) override
;
39 bool low_supports_breakpoints () override
;
41 CORE_ADDR
low_get_pc (regcache
*regcache
) override
;
43 void low_set_pc (regcache
*regcache
, CORE_ADDR newpc
) override
;
46 /* The singleton target ops object. */
48 static crisv32_target the_crisv32_target
;
51 crisv32_target::low_cannot_fetch_register (int regno
)
53 gdb_assert_not_reached ("linux target op low_cannot_fetch_register "
54 "is not implemented by the target");
58 crisv32_target::low_cannot_store_register (int regno
)
60 gdb_assert_not_reached ("linux target op low_cannot_store_register "
61 "is not implemented by the target");
65 crisv32_target::low_supports_breakpoints ()
71 crisv32_target::low_get_pc (regcache
*regcache
)
73 return linux_get_pc_32bit (regcache
);
77 crisv32_target::low_set_pc (regcache
*regcache
, CORE_ADDR pc
)
79 linux_set_pc_32bit (regcache
, pc
);
82 /* Defined in auto-generated file reg-crisv32.c. */
83 void init_registers_crisv32 (void);
84 extern const struct target_desc
*tdesc_crisv32
;
87 #define cris_num_regs 49
89 #ifndef PTRACE_GET_THREAD_AREA
90 #define PTRACE_GET_THREAD_AREA 25
93 /* Note: Ignoring USP (having the stack pointer in two locations causes trouble
94 without any significant gain). */
96 /* Locations need to match <include/asm/arch/ptrace.h>. */
97 static int cris_regmap
[] = {
100 9*4, 10*4, 11*4, 12*4,
101 13*4, 14*4, 24*4, 15*4,
104 -1, 22*4, 23*4, 17*4,
111 30*4, 31*4, 32*4, 33*4,
112 34*4, 35*4, 36*4, 37*4,
117 static const unsigned short cris_breakpoint
= 0xe938;
118 #define cris_breakpoint_len 2
120 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */
122 static const gdb_byte
*
123 cris_sw_breakpoint_from_kind (int kind
, int *size
)
125 *size
= cris_breakpoint_len
;
126 return (const gdb_byte
*) &cris_breakpoint
;
130 cris_breakpoint_at (CORE_ADDR where
)
134 the_target
->read_memory (where
, (unsigned char *) &insn
,
135 cris_breakpoint_len
);
136 if (insn
== cris_breakpoint
)
139 /* If necessary, recognize more trap instructions here. GDB only uses the
145 cris_write_data_breakpoint (struct regcache
*regcache
,
146 int bp
, unsigned long start
, unsigned long end
)
151 supply_register_by_name (regcache
, "s3", &start
);
152 supply_register_by_name (regcache
, "s4", &end
);
155 supply_register_by_name (regcache
, "s5", &start
);
156 supply_register_by_name (regcache
, "s6", &end
);
159 supply_register_by_name (regcache
, "s7", &start
);
160 supply_register_by_name (regcache
, "s8", &end
);
163 supply_register_by_name (regcache
, "s9", &start
);
164 supply_register_by_name (regcache
, "s10", &end
);
167 supply_register_by_name (regcache
, "s11", &start
);
168 supply_register_by_name (regcache
, "s12", &end
);
171 supply_register_by_name (regcache
, "s13", &start
);
172 supply_register_by_name (regcache
, "s14", &end
);
178 cris_supports_z_point_type (char z_type
)
182 case Z_PACKET_WRITE_WP
:
183 case Z_PACKET_READ_WP
:
184 case Z_PACKET_ACCESS_WP
:
192 cris_insert_point (enum raw_bkpt_type type
, CORE_ADDR addr
,
193 int len
, struct raw_breakpoint
*bp
)
196 unsigned long bp_ctrl
;
197 unsigned long start
, end
;
199 struct regcache
*regcache
;
201 regcache
= get_thread_regcache (current_thread
, 1);
203 /* Read watchpoints are set as access watchpoints, because of GDB's
204 inability to deal with pure read watchpoints. */
205 if (type
== raw_bkpt_type_read_wp
)
206 type
= raw_bkpt_type_access_wp
;
208 /* Get the configuration register. */
209 collect_register_by_name (regcache
, "s0", &bp_ctrl
);
211 /* The watchpoint allocation scheme is the simplest possible.
212 For example, if a region is watched for read and
213 a write watch is requested, a new watchpoint will
214 be used. Also, if a watch for a region that is already
215 covered by one or more existing watchpoints, a new
216 watchpoint will be used. */
218 /* First, find a free data watchpoint. */
219 for (bp
= 0; bp
< 6; bp
++)
221 /* Each data watchpoint's control registers occupy 2 bits
222 (hence the 3), starting at bit 2 for D0 (hence the 2)
223 with 4 bits between for each watchpoint (yes, the 4). */
224 if (!(bp_ctrl
& (0x3 << (2 + (bp
* 4)))))
230 /* We're out of watchpoints. */
234 /* Configure the control register first. */
235 if (type
== raw_bkpt_type_read_wp
|| type
== raw_bkpt_type_access_wp
)
237 /* Trigger on read. */
238 bp_ctrl
|= (1 << (2 + bp
* 4));
240 if (type
== raw_bkpt_type_write_wp
|| type
== raw_bkpt_type_access_wp
)
242 /* Trigger on write. */
243 bp_ctrl
|= (2 << (2 + bp
* 4));
246 /* Setup the configuration register. */
247 supply_register_by_name (regcache
, "s0", &bp_ctrl
);
249 /* Setup the range. */
251 end
= addr
+ len
- 1;
253 /* Configure the watchpoint register. */
254 cris_write_data_breakpoint (regcache
, bp
, start
, end
);
256 collect_register_by_name (regcache
, "ccs", &ccs
);
257 /* Set the S1 flag to enable watchpoints. */
259 supply_register_by_name (regcache
, "ccs", &ccs
);
265 cris_remove_point (enum raw_bkpt_type type
, CORE_ADDR addr
, int len
,
266 struct raw_breakpoint
*bp
)
269 unsigned long bp_ctrl
;
270 unsigned long start
, end
;
271 struct regcache
*regcache
;
272 unsigned long bp_d_regs
[12];
274 regcache
= get_thread_regcache (current_thread
, 1);
276 /* Read watchpoints are set as access watchpoints, because of GDB's
277 inability to deal with pure read watchpoints. */
278 if (type
== raw_bkpt_type_read_wp
)
279 type
= raw_bkpt_type_access_wp
;
281 /* Get the configuration register. */
282 collect_register_by_name (regcache
, "s0", &bp_ctrl
);
284 /* Try to find a watchpoint that is configured for the
285 specified range, then check that read/write also matches. */
287 /* Ugly pointer arithmetic, since I cannot rely on a
288 single switch (addr) as there may be several watchpoints with
289 the same start address for example. */
291 /* Get all range registers to simplify search. */
292 collect_register_by_name (regcache
, "s3", &bp_d_regs
[0]);
293 collect_register_by_name (regcache
, "s4", &bp_d_regs
[1]);
294 collect_register_by_name (regcache
, "s5", &bp_d_regs
[2]);
295 collect_register_by_name (regcache
, "s6", &bp_d_regs
[3]);
296 collect_register_by_name (regcache
, "s7", &bp_d_regs
[4]);
297 collect_register_by_name (regcache
, "s8", &bp_d_regs
[5]);
298 collect_register_by_name (regcache
, "s9", &bp_d_regs
[6]);
299 collect_register_by_name (regcache
, "s10", &bp_d_regs
[7]);
300 collect_register_by_name (regcache
, "s11", &bp_d_regs
[8]);
301 collect_register_by_name (regcache
, "s12", &bp_d_regs
[9]);
302 collect_register_by_name (regcache
, "s13", &bp_d_regs
[10]);
303 collect_register_by_name (regcache
, "s14", &bp_d_regs
[11]);
305 for (bp
= 0; bp
< 6; bp
++)
307 if (bp_d_regs
[bp
* 2] == addr
308 && bp_d_regs
[bp
* 2 + 1] == (addr
+ len
- 1)) {
309 /* Matching range. */
310 int bitpos
= 2 + bp
* 4;
313 /* Read/write bits for this BP. */
314 rw_bits
= (bp_ctrl
& (0x3 << bitpos
)) >> bitpos
;
316 if ((type
== raw_bkpt_type_read_wp
&& rw_bits
== 0x1)
317 || (type
== raw_bkpt_type_write_wp
&& rw_bits
== 0x2)
318 || (type
== raw_bkpt_type_access_wp
&& rw_bits
== 0x3))
320 /* Read/write matched. */
328 /* No watchpoint matched. */
332 /* Found a matching watchpoint. Now, deconfigure it by
333 both disabling read/write in bp_ctrl and zeroing its
334 start/end addresses. */
335 bp_ctrl
&= ~(3 << (2 + (bp
* 4)));
336 /* Setup the configuration register. */
337 supply_register_by_name (regcache
, "s0", &bp_ctrl
);
340 /* Configure the watchpoint register. */
341 cris_write_data_breakpoint (regcache
, bp
, start
, end
);
343 /* Note that we don't clear the S1 flag here. It's done when continuing. */
348 cris_stopped_by_watchpoint (void)
351 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
353 collect_register_by_name (regcache
, "exs", &exs
);
355 return (((exs
& 0xff00) >> 8) == 0xc);
359 cris_stopped_data_address (void)
362 struct regcache
*regcache
= get_thread_regcache (current_thread
, 1);
364 collect_register_by_name (regcache
, "eda", &eda
);
366 /* FIXME: Possibly adjust to match watched range. */
371 ps_get_thread_area (struct ps_prochandle
*ph
,
372 lwpid_t lwpid
, int idx
, void **base
)
374 if (ptrace (PTRACE_GET_THREAD_AREA
, lwpid
, NULL
, base
) != 0)
377 /* IDX is the bias from the thread pointer to the beginning of the
378 thread descriptor. It has to be subtracted due to implementation
379 quirks in libthread_db. */
380 *base
= (void *) ((char *) *base
- idx
);
385 cris_fill_gregset (struct regcache
*regcache
, void *buf
)
389 for (i
= 0; i
< cris_num_regs
; i
++)
391 if (cris_regmap
[i
] != -1)
392 collect_register (regcache
, i
, ((char *) buf
) + cris_regmap
[i
]);
397 cris_store_gregset (struct regcache
*regcache
, const void *buf
)
401 for (i
= 0; i
< cris_num_regs
; i
++)
403 if (cris_regmap
[i
] != -1)
404 supply_register (regcache
, i
, ((char *) buf
) + cris_regmap
[i
]);
409 crisv32_target::low_arch_setup ()
411 current_process ()->tdesc
= tdesc_crisv32
;
414 /* Support for hardware single step. */
417 cris_supports_hardware_single_step (void)
422 static struct regset_info cris_regsets
[] = {
423 { PTRACE_GETREGS
, PTRACE_SETREGS
, 0, cris_num_regs
* 4,
424 GENERAL_REGS
, cris_fill_gregset
, cris_store_gregset
},
429 static struct regsets_info cris_regsets_info
=
431 cris_regsets
, /* regsets */
433 NULL
, /* disabled_regsets */
436 static struct usrregs_info cris_usrregs_info
=
442 static struct regs_info myregs_info
=
444 NULL
, /* regset_bitmap */
450 crisv32_target::get_regs_info ()
455 struct linux_target_ops the_low_target
= {
456 cris_sw_breakpoint_from_kind
,
457 NULL
, /* get_next_pcs */
460 cris_supports_z_point_type
,
463 cris_stopped_by_watchpoint
,
464 cris_stopped_data_address
,
465 NULL
, /* collect_ptrace_register */
466 NULL
, /* supply_ptrace_register */
467 NULL
, /* siginfo_fixup */
468 NULL
, /* new_process */
469 NULL
, /* delete_process */
470 NULL
, /* new_thread */
471 NULL
, /* delete_thread */
473 NULL
, /* prepare_to_resume */
474 NULL
, /* process_qsupported */
475 NULL
, /* supports_tracepoints */
476 NULL
, /* get_thread_area */
477 NULL
, /* install_fast_tracepoint_jump_pad */
479 NULL
, /* get_min_fast_tracepoint_insn_len */
480 NULL
, /* supports_range_stepping */
481 cris_supports_hardware_single_step
,
484 /* The linux target ops object. */
486 linux_process_target
*the_linux_target
= &the_crisv32_target
;
489 initialize_low_arch (void)
491 init_registers_crisv32 ();
493 initialize_regsets_info (&cris_regsets_info
);