1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
3 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 #include "linux-low.h"
23 #include <sys/ptrace.h>
25 #include "gdb_proc_service.h"
27 /* The stack pointer is offset from the stack frame by a BIAS of 2047
28 (0x7ff) for 64-bit code. BIAS is likely to be defined on SPARC
29 hosts, so undefine it first. */
39 #define SPARC_R_REGS_NUM 32
40 #define SPARC_F_REGS_NUM 48
41 #define SPARC_CONTROL_REGS_NUM 6
43 #define sparc_num_regs \
44 (SPARC_R_REGS_NUM + SPARC_F_REGS_NUM + SPARC_CONTROL_REGS_NUM)
46 /* Each offset is multiplied by 8, because of the register size.
47 These offsets apply to the buffer sent/filled by ptrace.
48 Additionally, the array elements order corresponds to the .dat file, and the
49 gdb's registers enumeration order. */
51 static int sparc_regmap
[] = {
52 /* These offsets correspond to GET/SETREGSET. */
53 -1, 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, /* g0 .. g7 */
54 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, /* o0 .. o5, sp, o7 */
55 -1, -1, -1, -1, -1, -1, -1, -1, /* l0 .. l7 */
56 -1, -1, -1, -1, -1, -1, -1, -1, /* i0 .. i5, fp, i7 */
58 /* Floating point registers offsets correspond to GET/SETFPREGSET. */
59 0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4, /* f0 .. f7 */
60 8*4, 9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4, /* f8 .. f15 */
61 16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4, /* f16 .. f23 */
62 24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4, /* f24 .. f31 */
64 /* F32 offset starts next to f31: 31*4+4 = 16 * 8. */
65 16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8, /* f32 .. f46 */
66 24*8, 25*8, 26*8, 27*8, 28*8, 29*8, 30*8, 31*8, /* f48 .. f62 */
71 /* FSR offset also corresponds to GET/SETFPREGSET, ans is placed
75 /* Y register is 32-bits length, but gdb takes care of that. */
87 static const struct regs_range_t gregs_ranges
[] = {
88 { 0, 31 }, /* g0 .. i7 */
89 { 80, 82 }, /* pc .. state */
90 { 84, 85 } /* fprs .. y */
93 #define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t))
95 static const struct regs_range_t fpregs_ranges
[] = {
96 { 32, 79 }, /* f0 .. f62 */
100 #define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t))
102 /* Defined in auto-generated file reg-sparc64.c. */
103 void init_registers_sparc64 (void);
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("l0");
124 const int i7_regno
= l0_regno
+ 15;
126 /* These registers have to be stored in the stack. */
127 memcpy(&addr
, ((char *) buf
) + sparc_regmap
[find_regno("sp")], sizeof(addr
));
131 for (i
= l0_regno
; i
<= i7_regno
; i
++)
133 collect_register (regcache
, i
, tmp_reg_buf
);
134 (*the_target
->write_memory
) (addr
, tmp_reg_buf
, sizeof(tmp_reg_buf
));
135 addr
+= sizeof(tmp_reg_buf
);
140 sparc_fill_gregset (struct regcache
*regcache
, void *buf
)
145 for (range
= 0; range
< N_GREGS_RANGES
; range
++)
146 for (i
= gregs_ranges
[range
].regno_start
;
147 i
<= gregs_ranges
[range
].regno_end
; i
++)
148 if (sparc_regmap
[i
] != -1)
149 collect_register (regcache
, i
, ((char *) buf
) + sparc_regmap
[i
]);
151 sparc_fill_gregset_to_stack (regcache
, buf
);
155 sparc_fill_fpregset (struct regcache
*regcache
, void *buf
)
160 for (range
= 0; range
< N_FPREGS_RANGES
; range
++)
161 for (i
= fpregs_ranges
[range
].regno_start
;
162 i
<= fpregs_ranges
[range
].regno_end
; i
++)
163 collect_register (regcache
, i
, ((char *) buf
) + sparc_regmap
[i
]);
168 sparc_store_gregset_from_stack (struct regcache
*regcache
, const void *buf
)
172 unsigned char tmp_reg_buf
[8];
173 const int l0_regno
= find_regno("l0");
174 const int i7_regno
= l0_regno
+ 15;
176 /* These registers have to be obtained from the stack. */
177 memcpy(&addr
, ((char *) buf
) + sparc_regmap
[find_regno("sp")], sizeof(addr
));
181 for (i
= l0_regno
; i
<= i7_regno
; i
++)
183 (*the_target
->read_memory
) (addr
, tmp_reg_buf
, sizeof(tmp_reg_buf
));
184 supply_register (regcache
, i
, tmp_reg_buf
);
185 addr
+= sizeof(tmp_reg_buf
);
190 sparc_store_gregset (struct regcache
*regcache
, const void *buf
)
196 memset (zerobuf
, 0, sizeof(zerobuf
));
198 for (range
= 0; range
< N_GREGS_RANGES
; range
++)
199 for (i
= gregs_ranges
[range
].regno_start
;
200 i
<= gregs_ranges
[range
].regno_end
; i
++)
201 if (sparc_regmap
[i
] != -1)
202 supply_register (regcache
, i
, ((char *) buf
) + sparc_regmap
[i
]);
204 supply_register (regcache
, i
, zerobuf
);
206 sparc_store_gregset_from_stack (regcache
, buf
);
210 sparc_store_fpregset (struct regcache
*regcache
, const void *buf
)
215 for (range
= 0; range
< N_FPREGS_RANGES
; range
++)
216 for (i
= fpregs_ranges
[range
].regno_start
;
217 i
<= fpregs_ranges
[range
].regno_end
;
219 supply_register (regcache
, i
, ((char *) buf
) + sparc_regmap
[i
]);
222 extern int debug_threads
;
225 sparc_get_pc (struct regcache
*regcache
)
228 collect_register_by_name (regcache
, "pc", &pc
);
230 fprintf (stderr
, "stop pc is %08lx\n", pc
);
234 static const unsigned char sparc_breakpoint
[INSN_SIZE
] = {
235 0x91, 0xd0, 0x20, 0x01
237 #define sparc_breakpoint_len INSN_SIZE
241 sparc_breakpoint_at (CORE_ADDR where
)
243 unsigned char insn
[INSN_SIZE
];
245 (*the_target
->read_memory
) (where
, (unsigned char *) insn
, sizeof(insn
));
247 if (memcmp(sparc_breakpoint
, insn
, sizeof(insn
)) == 0)
250 /* If necessary, recognize more trap instructions here. GDB only
256 /* We only place breakpoints in empty marker functions, and thread locking
257 is outside of the function. So rather than importing software single-step,
258 we can just run until exit. */
260 sparc_reinsert_addr (void)
262 struct regcache
*regcache
= get_thread_regcache (current_inferior
, 1);
264 /* O7 is the equivalent to the 'lr' of other archs. */
265 collect_register_by_name (regcache
, "o7", &lr
);
270 struct regset_info target_regsets
[] = {
271 { PTRACE_GETREGS
, PTRACE_SETREGS
, 0, sizeof (elf_gregset_t
),
273 sparc_fill_gregset
, sparc_store_gregset
},
274 { PTRACE_GETFPREGS
, PTRACE_SETFPREGS
, 0, sizeof (fpregset_t
),
276 sparc_fill_fpregset
, sparc_store_fpregset
},
277 { 0, 0, 0, -1, -1, NULL
, NULL
}
280 struct linux_target_ops the_low_target
= {
281 init_registers_sparc64
,
283 /* No regmap needs to be provided since this impl. doesn't use USRREGS. */
285 sparc_cannot_fetch_register
,
286 sparc_cannot_store_register
,
288 /* No sparc_set_pc is needed. */
290 (const unsigned char *) sparc_breakpoint
,
291 sparc_breakpoint_len
,
295 NULL
, NULL
, NULL
, NULL
,