GDBserver
linux-sparc-low.c
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1 /* Low level interface to ptrace, for the remote server for GDB.
2  Copyright (C) 1995-2015 Free Software Foundation, Inc.
3 
4  This file is part of GDB.
5 
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.
10 
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.
15 
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/>. */
18 
19 #include "server.h"
20 #include "linux-low.h"
21 
22 #include <sys/ptrace.h>
23 
24 #include "gdb_proc_service.h"
25 
26 /* The stack pointer is offset from the stack frame by a BIAS of 2047
27  (0x7ff) for 64-bit code. BIAS is likely to be defined on SPARC
28  hosts, so undefine it first. */
29 #undef BIAS
30 #define BIAS 2047
31 
32 #ifdef HAVE_SYS_REG_H
33 #include <sys/reg.h>
34 #endif
35 
36 #define INSN_SIZE 4
37 
38 #define SPARC_R_REGS_NUM 32
39 #define SPARC_F_REGS_NUM 48
40 #define SPARC_CONTROL_REGS_NUM 6
41 
42 #define sparc_num_regs \
43  (SPARC_R_REGS_NUM + SPARC_F_REGS_NUM + SPARC_CONTROL_REGS_NUM)
44 
45 /* Each offset is multiplied by 8, because of the register size.
46  These offsets apply to the buffer sent/filled by ptrace.
47  Additionally, the array elements order corresponds to the .dat file, and the
48  gdb's registers enumeration order. */
49 
50 static int sparc_regmap[] = {
51  /* These offsets correspond to GET/SETREGSET. */
52  -1, 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, /* g0 .. g7 */
53  7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, /* o0 .. o5, sp, o7 */
54  -1, -1, -1, -1, -1, -1, -1, -1, /* l0 .. l7 */
55  -1, -1, -1, -1, -1, -1, -1, -1, /* i0 .. i5, fp, i7 */
56 
57  /* Floating point registers offsets correspond to GET/SETFPREGSET. */
58  0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4, /* f0 .. f7 */
59  8*4, 9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4, /* f8 .. f15 */
60  16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4, /* f16 .. f23 */
61  24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4, /* f24 .. f31 */
62 
63  /* F32 offset starts next to f31: 31*4+4 = 16 * 8. */
64  16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8, /* f32 .. f46 */
65  24*8, 25*8, 26*8, 27*8, 28*8, 29*8, 30*8, 31*8, /* f48 .. f62 */
66 
67  17 *8, /* pc */
68  18 *8, /* npc */
69  16 *8, /* state */
70  /* FSR offset also corresponds to GET/SETFPREGSET, ans is placed
71  next to f62. */
72  32 *8, /* fsr */
73  -1, /* fprs */
74  /* Y register is 32-bits length, but gdb takes care of that. */
75  19 *8, /* y */
76 
77 };
78 
79 
81 {
83  int regno_end;
84 };
85 
86 static const struct regs_range_t gregs_ranges[] = {
87  { 0, 31 }, /* g0 .. i7 */
88  { 80, 82 }, /* pc .. state */
89  { 84, 85 } /* fprs .. y */
90 };
91 
92 #define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t))
93 
94 static const struct regs_range_t fpregs_ranges[] = {
95  { 32, 79 }, /* f0 .. f62 */
96  { 83, 83 } /* fsr */
97 };
98 
99 #define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t))
100 
101 /* Defined in auto-generated file reg-sparc64.c. */
102 void init_registers_sparc64 (void);
103 extern const struct target_desc *tdesc_sparc64;
104 
105 static int
107 {
108  return (regno >= sparc_num_regs || sparc_regmap[regno] == -1);
109 }
110 
111 static int
113 {
114  return (regno >= sparc_num_regs || sparc_regmap[regno] == -1);
115 }
116 
117 static void
119 {
120  int i;
121  CORE_ADDR addr = 0;
122  unsigned char tmp_reg_buf[8];
123  const int l0_regno = find_regno (regcache->tdesc, "l0");
124  const int i7_regno = l0_regno + 15;
125 
126  /* These registers have to be stored in the stack. */
127  memcpy (&addr,
128  ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")],
129  sizeof (addr));
130 
131  addr += BIAS;
132 
133  for (i = l0_regno; i <= i7_regno; i++)
134  {
135  collect_register (regcache, i, tmp_reg_buf);
136  (*the_target->write_memory) (addr, tmp_reg_buf, sizeof (tmp_reg_buf));
137  addr += sizeof (tmp_reg_buf);
138  }
139 }
140 
141 static void
143 {
144  int i;
145  int range;
146 
147  for (range = 0; range < N_GREGS_RANGES; range++)
148  for (i = gregs_ranges[range].regno_start;
149  i <= gregs_ranges[range].regno_end; i++)
150  if (sparc_regmap[i] != -1)
151  collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
152 
153  sparc_fill_gregset_to_stack (regcache, buf);
154 }
155 
156 static void
158 {
159  int i;
160  int range;
161 
162  for (range = 0; range < N_FPREGS_RANGES; range++)
163  for (i = fpregs_ranges[range].regno_start;
164  i <= fpregs_ranges[range].regno_end; i++)
165  collect_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
166 
167 }
168 
169 static void
171 {
172  int i;
173  CORE_ADDR addr = 0;
174  unsigned char tmp_reg_buf[8];
175  const int l0_regno = find_regno (regcache->tdesc, "l0");
176  const int i7_regno = l0_regno + 15;
177 
178  /* These registers have to be obtained from the stack. */
179  memcpy (&addr,
180  ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")],
181  sizeof (addr));
182 
183  addr += BIAS;
184 
185  for (i = l0_regno; i <= i7_regno; i++)
186  {
187  (*the_target->read_memory) (addr, tmp_reg_buf, sizeof (tmp_reg_buf));
188  supply_register (regcache, i, tmp_reg_buf);
189  addr += sizeof (tmp_reg_buf);
190  }
191 }
192 
193 static void
194 sparc_store_gregset (struct regcache *regcache, const void *buf)
195 {
196  int i;
197  char zerobuf[8];
198  int range;
199 
200  memset (zerobuf, 0, sizeof (zerobuf));
201 
202  for (range = 0; range < N_GREGS_RANGES; range++)
203  for (i = gregs_ranges[range].regno_start;
204  i <= gregs_ranges[range].regno_end; i++)
205  if (sparc_regmap[i] != -1)
206  supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
207  else
208  supply_register (regcache, i, zerobuf);
209 
210  sparc_store_gregset_from_stack (regcache, buf);
211 }
212 
213 static void
214 sparc_store_fpregset (struct regcache *regcache, const void *buf)
215 {
216  int i;
217  int range;
218 
219  for (range = 0; range < N_FPREGS_RANGES; range++)
220  for (i = fpregs_ranges[range].regno_start;
221  i <= fpregs_ranges[range].regno_end;
222  i++)
223  supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
224 }
225 
226 extern int debug_threads;
227 
228 static CORE_ADDR
230 {
231  unsigned long pc;
232  collect_register_by_name (regcache, "pc", &pc);
233  if (debug_threads)
234  debug_printf ("stop pc is %08lx\n", pc);
235  return pc;
236 }
237 
238 static const unsigned char sparc_breakpoint[INSN_SIZE] = {
239  0x91, 0xd0, 0x20, 0x01
240 };
241 #define sparc_breakpoint_len INSN_SIZE
242 
243 
244 static int
246 {
247  unsigned char insn[INSN_SIZE];
248 
249  (*the_target->read_memory) (where, (unsigned char *) insn, sizeof (insn));
250 
251  if (memcmp (sparc_breakpoint, insn, sizeof (insn)) == 0)
252  return 1;
253 
254  /* If necessary, recognize more trap instructions here. GDB only
255  uses TRAP Always. */
256 
257  return 0;
258 }
259 
260 /* We only place breakpoints in empty marker functions, and thread locking
261  is outside of the function. So rather than importing software single-step,
262  we can just run until exit. */
263 static CORE_ADDR
265 {
267  CORE_ADDR lr;
268  /* O7 is the equivalent to the 'lr' of other archs. */
269  collect_register_by_name (regcache, "o7", &lr);
270  return lr;
271 }
272 
273 static void
275 {
277 }
278 
279 static struct regset_info sparc_regsets[] = {
280  { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t),
281  GENERAL_REGS,
283  { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (fpregset_t),
284  FP_REGS,
286  { 0, 0, 0, -1, -1, NULL, NULL }
287 };
288 
289 static struct regsets_info sparc_regsets_info =
290  {
291  sparc_regsets, /* regsets */
292  0, /* num_regsets */
293  NULL, /* disabled_regsets */
294  };
295 
296 static struct usrregs_info sparc_usrregs_info =
297  {
299  /* No regmap needs to be provided since this impl. doesn't use
300  USRREGS. */
301  NULL
302  };
303 
304 static struct regs_info regs_info =
305  {
306  NULL, /* regset_bitmap */
308  &sparc_regsets_info
309  };
310 
311 static const struct regs_info *
313 {
314  return &regs_info;
315 }
316 
317 struct linux_target_ops the_low_target = {
322  NULL, /* fetch_register */
323  sparc_get_pc,
324  /* No sparc_set_pc is needed. */
325  NULL,
326  (const unsigned char *) sparc_breakpoint,
329  0,
331  NULL, /* supports_z_point_type */
332  NULL, NULL, NULL, NULL,
333  NULL, NULL
334 };
335 
336 void
338 {
339  /* Initialize the Linux target descriptions. */
341 
342  initialize_regsets_info (&sparc_regsets_info);
343 }
const struct target_desc * tdesc
Definition: regcache.h:41
struct thread_info * current_thread
Definition: inferiors.c:28
void collect_register(struct regcache *regcache, int n, void *buf)
Definition: regcache.c:414
static void sparc_fill_fpregset(struct regcache *regcache, void *buf)
#define N_FPREGS_RANGES
bfd_vma CORE_ADDR
Definition: common-types.h:41
#define N_GREGS_RANGES
static struct regs_info regs_info
void init_registers_sparc64(void)
static CORE_ADDR sparc_get_pc(struct regcache *regcache)
static int sparc_breakpoint_at(CORE_ADDR where)
static int sparc_regmap[]
struct target_ops * the_target
Definition: target.c:24
const struct target_desc * tdesc
Definition: inferiors.h:69
static int sparc_cannot_store_register(int regno)
static void sparc_store_gregset_from_stack(struct regcache *regcache, const void *buf)
static const struct regs_info * sparc_regs_info(void)
int debug_threads
Definition: debug.c:24
void collect_register_by_name(struct regcache *regcache, const char *name, void *buf)
Definition: regcache.c:430
#define sparc_num_regs
int(* write_memory)(CORE_ADDR memaddr, const unsigned char *myaddr, int len)
Definition: target.h:169
static void sparc_store_fpregset(struct regcache *regcache, const void *buf)
static CORE_ADDR sparc_reinsert_addr(void)
void initialize_low_arch(void)
static struct regset_info sparc_regsets[]
static const unsigned char sparc_breakpoint[INSN_SIZE]
struct process_info * current_process(void)
Definition: inferiors.c:356
static int sparc_cannot_fetch_register(int regno)
#define BIAS
static void sparc_fill_gregset_to_stack(struct regcache *regcache, const void *buf)
int find_regno(const struct target_desc *tdesc, const char *name)
Definition: regcache.c:257
const struct target_desc * tdesc_sparc64
static void sparc_arch_setup(void)
int(* read_memory)(CORE_ADDR memaddr, unsigned char *myaddr, int len)
Definition: target.h:160
struct regcache * get_thread_regcache(struct thread_info *thread, int fetch)
Definition: regcache.c:27
#define sparc_breakpoint_len
static void sparc_store_gregset(struct regcache *regcache, const void *buf)
void debug_printf(const char *fmt,...)
Definition: common-debug.c:30
static struct usrregs_info sparc_usrregs_info
void supply_register(struct regcache *regcache, int n, const void *buf)
Definition: regcache.c:330
#define INSN_SIZE
static void sparc_fill_gregset(struct regcache *regcache, void *buf)