1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2014 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 <sys/ptrace.h>
24 #include "gdb_proc_service.h"
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. */
38 #define SPARC_R_REGS_NUM 32
39 #define SPARC_F_REGS_NUM 48
40 #define SPARC_CONTROL_REGS_NUM 6
42 #define sparc_num_regs \
43 (SPARC_R_REGS_NUM + SPARC_F_REGS_NUM + SPARC_CONTROL_REGS_NUM)
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. */
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 */
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 */
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 */
70 /* FSR offset also corresponds to GET/SETFPREGSET, ans is placed
74 /* Y register is 32-bits length, but gdb takes care of that. */
86 static const struct regs_range_t gregs_ranges[] = {
87 { 0, 31 }, /* g0 .. i7 */
88 { 80, 82 }, /* pc .. state */
89 { 84, 85 } /* fprs .. y */
92 #define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t))
94 static const struct regs_range_t fpregs_ranges[] = {
95 { 32, 79 }, /* f0 .. f62 */
99 #define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t))
101 /* Defined in auto-generated file reg-sparc64.c. */
102 void init_registers_sparc64 (void);
103 extern const struct target_desc *tdesc_sparc64;
106 sparc_cannot_store_register (int regno)
108 return (regno >= sparc_num_regs || sparc_regmap[regno] == -1);
112 sparc_cannot_fetch_register (int regno)
114 return (regno >= sparc_num_regs || sparc_regmap[regno] == -1);
118 sparc_fill_gregset_to_stack (struct regcache *regcache, const void *buf)
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;
126 /* These registers have to be stored in the stack. */
128 ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")],
133 for (i = l0_regno; i <= i7_regno; i++)
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);
142 sparc_fill_gregset (struct regcache *regcache, void *buf)
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]);
153 sparc_fill_gregset_to_stack (regcache, buf);
157 sparc_fill_fpregset (struct regcache *regcache, void *buf)
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]);
170 sparc_store_gregset_from_stack (struct regcache *regcache, const void *buf)
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;
178 /* These registers have to be obtained from the stack. */
180 ((char *) buf) + sparc_regmap[find_regno (regcache->tdesc, "sp")],
185 for (i = l0_regno; i <= i7_regno; i++)
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);
194 sparc_store_gregset (struct regcache *regcache, const void *buf)
200 memset (zerobuf, 0, sizeof (zerobuf));
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]);
208 supply_register (regcache, i, zerobuf);
210 sparc_store_gregset_from_stack (regcache, buf);
214 sparc_store_fpregset (struct regcache *regcache, const void *buf)
219 for (range = 0; range < N_FPREGS_RANGES; range++)
220 for (i = fpregs_ranges[range].regno_start;
221 i <= fpregs_ranges[range].regno_end;
223 supply_register (regcache, i, ((char *) buf) + sparc_regmap[i]);
226 extern int debug_threads;
229 sparc_get_pc (struct regcache *regcache)
232 collect_register_by_name (regcache, "pc", &pc);
234 debug_printf ("stop pc is %08lx\n", pc);
238 static const unsigned char sparc_breakpoint[INSN_SIZE] = {
239 0x91, 0xd0, 0x20, 0x01
241 #define sparc_breakpoint_len INSN_SIZE
245 sparc_breakpoint_at (CORE_ADDR where)
247 unsigned char insn[INSN_SIZE];
249 (*the_target->read_memory) (where, (unsigned char *) insn, sizeof (insn));
251 if (memcmp (sparc_breakpoint, insn, sizeof (insn)) == 0)
254 /* If necessary, recognize more trap instructions here. GDB only
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. */
264 sparc_reinsert_addr (void)
266 struct regcache *regcache = get_thread_regcache (current_inferior, 1);
268 /* O7 is the equivalent to the 'lr' of other archs. */
269 collect_register_by_name (regcache, "o7", &lr);
274 sparc_arch_setup (void)
276 current_process ()->tdesc = tdesc_sparc64;
279 static struct regset_info sparc_regsets[] = {
280 { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t),
282 sparc_fill_gregset, sparc_store_gregset },
283 { PTRACE_GETFPREGS, PTRACE_SETFPREGS, 0, sizeof (fpregset_t),
285 sparc_fill_fpregset, sparc_store_fpregset },
286 { 0, 0, 0, -1, -1, NULL, NULL }
289 static struct regsets_info sparc_regsets_info =
291 sparc_regsets, /* regsets */
293 NULL, /* disabled_regsets */
296 static struct usrregs_info sparc_usrregs_info =
299 /* No regmap needs to be provided since this impl. doesn't use
304 static struct regs_info regs_info =
306 NULL, /* regset_bitmap */
311 static const struct regs_info *
312 sparc_regs_info (void)
317 struct linux_target_ops the_low_target = {
320 sparc_cannot_fetch_register,
321 sparc_cannot_store_register,
322 NULL, /* fetch_register */
324 /* No sparc_set_pc is needed. */
326 (const unsigned char *) sparc_breakpoint,
327 sparc_breakpoint_len,
331 NULL, /* supports_z_point_type */
332 NULL, NULL, NULL, NULL,
337 initialize_low_arch (void)
339 /* Initialize the Linux target descriptions. */
340 init_registers_sparc64 ();
342 initialize_regsets_info (&sparc_regsets_info);