GDBserver
linux-tic6x-low.c
Go to the documentation of this file.
1 /* Target dependent code for GDB on TI C6x systems.
2 
3  Copyright (C) 2010-2015 Free Software Foundation, Inc.
4  Contributed by Andrew Jenner <andrew@codesourcery.com>
5  Contributed by Yao Qi <yao@codesourcery.com>
6 
7  This file is part of GDB.
8 
9  This program is free software; you can redistribute it and/or modify
10  it under the terms of the GNU General Public License as published by
11  the Free Software Foundation; either version 3 of the License, or
12  (at your option) any later version.
13 
14  This program is distributed in the hope that it will be useful,
15  but WITHOUT ANY WARRANTY; without even the implied warranty of
16  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17  GNU General Public License for more details.
18 
19  You should have received a copy of the GNU General Public License
20  along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 
22 #include "server.h"
23 #include "linux-low.h"
24 
25 #include <sys/ptrace.h>
26 #include <endian.h>
27 
28 #include "gdb_proc_service.h"
29 
30 #ifndef PTRACE_GET_THREAD_AREA
31 #define PTRACE_GET_THREAD_AREA 25
32 #endif
33 
34 /* There are at most 69 registers accessible in ptrace. */
35 #define TIC6X_NUM_REGS 69
36 
37 #include <asm/ptrace.h>
38 
39 /* Defined in auto-generated file tic6x-c64xp-linux.c. */
41 extern const struct target_desc *tdesc_tic6x_c64xp_linux;
42 
43 /* Defined in auto-generated file tic6x-c64x-linux.c. */
45 extern const struct target_desc *tdesc_tic6x_c64x_linux;
46 
47 /* Defined in auto-generated file tic62x-c6xp-linux.c. */
49 extern const struct target_desc *tdesc_tic6x_c62x_linux;
50 
52 {
53  unsigned char buf[4];
54 
55  int reg32;
56 };
57 
58 /* Return the ptrace ``address'' of register REGNO. */
59 
60 #if __BYTE_ORDER == __BIG_ENDIAN
61 static int tic6x_regmap_c64xp[] = {
62  /* A0 - A15 */
63  53, 52, 55, 54, 57, 56, 59, 58,
64  61, 60, 63, 62, 65, 64, 67, 66,
65  /* B0 - B15 */
66  23, 22, 25, 24, 27, 26, 29, 28,
67  31, 30, 33, 32, 35, 34, 69, 68,
68  /* CSR PC */
69  5, 4,
70  /* A16 - A31 */
71  37, 36, 39, 38, 41, 40, 43, 42,
72  45, 44, 47, 46, 49, 48, 51, 50,
73  /* B16 - B31 */
74  7, 6, 9, 8, 11, 10, 13, 12,
75  15, 14, 17, 16, 19, 18, 21, 20,
76  /* TSR, ILC, RILC */
77  1, 2, 3
78 };
79 
80 static int tic6x_regmap_c64x[] = {
81  /* A0 - A15 */
82  51, 50, 53, 52, 55, 54, 57, 56,
83  59, 58, 61, 60, 63, 62, 65, 64,
84  /* B0 - B15 */
85  21, 20, 23, 22, 25, 24, 27, 26,
86  29, 28, 31, 30, 33, 32, 67, 66,
87  /* CSR PC */
88  3, 2,
89  /* A16 - A31 */
90  35, 34, 37, 36, 39, 38, 41, 40,
91  43, 42, 45, 44, 47, 46, 49, 48,
92  /* B16 - B31 */
93  5, 4, 7, 6, 9, 8, 11, 10,
94  13, 12, 15, 14, 17, 16, 19, 18,
95  -1, -1, -1
96 };
97 
98 static int tic6x_regmap_c62x[] = {
99  /* A0 - A15 */
100  19, 18, 21, 20, 23, 22, 25, 24,
101  27, 26, 29, 28, 31, 30, 33, 32,
102  /* B0 - B15 */
103  5, 4, 7, 6, 9, 8, 11, 10,
104  13, 12, 15, 14, 17, 16, 35, 34,
105  /* CSR, PC */
106  3, 2,
107  -1, -1, -1, -1, -1, -1, -1, -1,
108  -1, -1, -1, -1, -1, -1, -1, -1,
109  -1, -1, -1, -1, -1, -1, -1, -1,
110  -1, -1, -1, -1, -1, -1, -1, -1,
111  -1, -1, -1
112 };
113 
114 #else
115 static int tic6x_regmap_c64xp[] = {
116  /* A0 - A15 */
117  52, 53, 54, 55, 56, 57, 58, 59,
118  60, 61, 62, 63, 64, 65, 66, 67,
119  /* B0 - B15 */
120  22, 23, 24, 25, 26, 27, 28, 29,
121  30, 31, 32, 33, 34, 35, 68, 69,
122  /* CSR PC */
123  4, 5,
124  /* A16 - A31 */
125  36, 37, 38, 39, 40, 41, 42, 43,
126  44, 45, 46, 47, 48, 49, 50, 51,
127  /* B16 -B31 */
128  6, 7, 8, 9, 10, 11, 12, 13,
129  14, 15, 16, 17, 18, 19, 20, 31,
130  /* TSR, ILC, RILC */
131  0, 3, 2
132 };
133 
134 static int tic6x_regmap_c64x[] = {
135  /* A0 - A15 */
136  50, 51, 52, 53, 54, 55, 56, 57,
137  58, 59, 60, 61, 62, 63, 64, 65,
138  /* B0 - B15 */
139  20, 21, 22, 23, 24, 25, 26, 27,
140  28, 29, 30, 31, 32, 33, 66, 67,
141  /* CSR PC */
142  2, 3,
143  /* A16 - A31 */
144  34, 35, 36, 37, 38, 39, 40, 41,
145  42, 43, 44, 45, 46, 47, 48, 49,
146  /* B16 - B31 */
147  4, 5, 6, 7, 8, 9, 10, 11,
148  12, 13, 14, 15, 16, 17, 18, 19,
149  -1, -1, -1
150 };
151 
152 static int tic6x_regmap_c62x[] = {
153  /* A0 - A15 */
154  18, 19, 20, 21, 22, 23, 24, 25,
155  26, 27, 28, 29, 30, 31, 32, 33,
156  /* B0 - B15 */
157  4, 5, 6, 7, 8, 9, 10, 11,
158  12, 13, 14, 15, 16, 17, 34, 35,
159  /* CSR PC */
160  2, 3,
161  -1, -1, -1, -1, -1, -1, -1, -1,
162  -1, -1, -1, -1, -1, -1, -1, -1,
163  -1, -1, -1, -1, -1, -1, -1, -1,
164  -1, -1, -1, -1, -1, -1, -1, -1,
165  -1, -1, -1
166 };
167 
168 #endif
169 
170 extern struct linux_target_ops the_low_target;
171 
172 static int *tic6x_regmap;
173 static unsigned int tic6x_breakpoint;
174 
175 /* Forward definition. */
176 static struct usrregs_info tic6x_usrregs_info;
177 
178 static const struct target_desc *
180 {
181  register unsigned int csr asm ("B2");
182  unsigned int cpuid;
183  const struct target_desc *tdesc;
184 
185  /* Determine the CPU we're running on to find the register order. */
186  __asm__ ("MVC .S2 CSR,%0" : "=r" (csr) :);
187  cpuid = csr >> 24;
188  switch (cpuid)
189  {
190  case 0x00: /* C62x */
191  case 0x02: /* C67x */
192  tic6x_regmap = tic6x_regmap_c62x;
193  tic6x_breakpoint = 0x0000a122; /* BNOP .S2 0,5 */
194  tdesc = tdesc_tic6x_c62x_linux;
195  break;
196  case 0x03: /* C67x+ */
197  tic6x_regmap = tic6x_regmap_c64x;
198  tic6x_breakpoint = 0x0000a122; /* BNOP .S2 0,5 */
199  tdesc = tdesc_tic6x_c64x_linux;
200  break;
201  case 0x0c: /* C64x */
202  tic6x_regmap = tic6x_regmap_c64x;
203  tic6x_breakpoint = 0x0000a122; /* BNOP .S2 0,5 */
204  tdesc = tdesc_tic6x_c64x_linux;
205  break;
206  case 0x10: /* C64x+ */
207  case 0x14: /* C674x */
208  case 0x15: /* C66x */
209  tic6x_regmap = tic6x_regmap_c64xp;
210  tic6x_breakpoint = 0x56454314; /* illegal opcode */
211  tdesc = tdesc_tic6x_c64xp_linux;
212  break;
213  default:
214  error ("Unknown CPU ID 0x%02x", cpuid);
215  }
216  tic6x_usrregs_info.regmap = tic6x_regmap;
217  return tdesc;
218 }
219 
220 static int
222 {
223  return (tic6x_regmap[regno] == -1);
224 }
225 
226 static int
228 {
229  return (tic6x_regmap[regno] == -1);
230 }
231 
232 static CORE_ADDR
234 {
235  union tic6x_register pc;
236 
237  collect_register_by_name (regcache, "PC", pc.buf);
238  return pc.reg32;
239 }
240 
241 static void
243 {
244  union tic6x_register newpc;
245 
246  newpc.reg32 = pc;
247  supply_register_by_name (regcache, "PC", newpc.buf);
248 }
249 
250 #define tic6x_breakpoint_len 4
251 
252 static int
254 {
255  unsigned int insn;
256 
257  (*the_target->read_memory) (where, (unsigned char *) &insn, 4);
258  if (insn == tic6x_breakpoint)
259  return 1;
260 
261  /* If necessary, recognize more trap instructions here. GDB only uses the
262  one. */
263  return 0;
264 }
265 
266 /* Fetch the thread-local storage pointer for libthread_db. */
267 
268 ps_err_e
270  lwpid_t lwpid, int idx, void **base)
271 {
272  if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0)
273  return PS_ERR;
274 
275  /* IDX is the bias from the thread pointer to the beginning of the
276  thread descriptor. It has to be subtracted due to implementation
277  quirks in libthread_db. */
278  *base = (void *) ((char *) *base - idx);
279 
280  return PS_OK;
281 }
282 
283 static void
285  union tic6x_register *reg)
286 {
287  union tic6x_register tmp_reg;
288 
289  collect_register (regcache, regno, &tmp_reg.reg32);
290  reg->reg32 = tmp_reg.reg32;
291 }
292 
293 static void
295  const union tic6x_register *reg)
296 {
297  int offset = 0;
298 
299  supply_register (regcache, regno, reg->buf + offset);
300 }
301 
302 static void
304 {
305  union tic6x_register *regset = buf;
306  int i;
307 
308  for (i = 0; i < TIC6X_NUM_REGS; i++)
309  if (tic6x_regmap[i] != -1)
310  tic6x_collect_register (regcache, i, regset + tic6x_regmap[i]);
311 }
312 
313 static void
314 tic6x_store_gregset (struct regcache *regcache, const void *buf)
315 {
316  const union tic6x_register *regset = buf;
317  int i;
318 
319  for (i = 0; i < TIC6X_NUM_REGS; i++)
320  if (tic6x_regmap[i] != -1)
321  tic6x_supply_register (regcache, i, regset + tic6x_regmap[i]);
322 }
323 
324 static struct regset_info tic6x_regsets[] = {
325  { PTRACE_GETREGS, PTRACE_SETREGS, 0, TIC6X_NUM_REGS * 4, GENERAL_REGS,
327  { 0, 0, 0, -1, -1, NULL, NULL }
328 };
329 
330 static void
332 {
334 }
335 
336 static struct regsets_info tic6x_regsets_info =
337  {
338  tic6x_regsets, /* regsets */
339  0, /* num_regsets */
340  NULL, /* disabled_regsets */
341  };
342 
343 static struct usrregs_info tic6x_usrregs_info =
344  {
346  NULL, /* Set in tic6x_read_description. */
347  };
348 
349 static struct regs_info regs_info =
350  {
351  NULL, /* regset_bitmap */
353  &tic6x_regsets_info
354  };
355 
356 static const struct regs_info *
358 {
359  return &regs_info;
360 }
361 
362 struct linux_target_ops the_low_target = {
367  NULL, /* fetch_register */
368  tic6x_get_pc,
369  tic6x_set_pc,
370  (const unsigned char *) &tic6x_breakpoint,
372  NULL,
373  0,
375 };
376 
377 void
379 {
380  /* Initialize the Linux target descriptions. */
384 
385  initialize_regsets_info (&tic6x_regsets_info);
386 }
unsigned int lwpid_t
static void tic6x_fill_gregset(struct regcache *regcache, void *buf)
const struct target_desc * tdesc_tic6x_c64xp_linux
void collect_register(struct regcache *regcache, int n, void *buf)
Definition: regcache.c:414
bfd_vma CORE_ADDR
Definition: common-types.h:41
void supply_register_by_name(struct regcache *regcache, const char *name, const void *buf)
Definition: regcache.c:405
#define PTRACE_GET_THREAD_AREA
static int tic6x_cannot_fetch_register(int regno)
static const struct regs_info * tic6x_regs_info(void)
static void tic6x_collect_register(struct regcache *regcache, int regno, union tic6x_register *reg)
static struct regset_info tic6x_regsets[]
void initialize_low_arch(void)
ps_err_e
struct target_ops * the_target
Definition: target.c:24
static struct regs_info regs_info
const struct target_desc * tdesc_tic6x_c64x_linux
const struct target_desc * tdesc
Definition: inferiors.h:69
static void tic6x_supply_register(struct regcache *regcache, int regno, const union tic6x_register *reg)
unsigned char buf[4]
void collect_register_by_name(struct regcache *regcache, const char *name, void *buf)
Definition: regcache.c:430
static int tic6x_regmap_c62x[]
#define TIC6X_NUM_REGS
int offset
Definition: tracepoint.c:179
static int * tic6x_regmap
static void tic6x_store_gregset(struct regcache *regcache, const void *buf)
static CORE_ADDR tic6x_get_pc(struct regcache *regcache)
void init_registers_tic6x_c64xp_linux(void)
struct process_info * current_process(void)
Definition: inferiors.c:356
#define tic6x_breakpoint_len
static struct usrregs_info tic6x_usrregs_info
static int tic6x_regmap_c64x[]
ps_err_e ps_get_thread_area(const struct ps_prochandle *ph, lwpid_t lwpid, int idx, void **base)
static unsigned int tic6x_breakpoint
int(* read_memory)(CORE_ADDR memaddr, unsigned char *myaddr, int len)
Definition: target.h:160
void init_registers_tic6x_c62x_linux(void)
static const struct target_desc * tic6x_read_description(void)
static int tic6x_cannot_store_register(int regno)
const struct target_desc * tdesc_tic6x_c62x_linux
static int tic6x_regmap_c64xp[]
static void tic6x_set_pc(struct regcache *regcache, CORE_ADDR pc)
static int tic6x_breakpoint_at(CORE_ADDR where)
static void tic6x_arch_setup(void)
void supply_register(struct regcache *regcache, int n, const void *buf)
Definition: regcache.c:330
int * regmap
Definition: linux-low.h:83
static struct regsets_info tic6x_regsets_info
void error(const char *fmt,...)
Definition: errors.c:38
void init_registers_tic6x_c64x_linux(void)