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 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 (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 next to f62. */
73 /* Y register is 32-bits length, but gdb takes care of that. */
85 static const struct regs_range_t gregs_ranges
[] = {
86 { 0, 31 }, /* g0 .. i7 */
87 { 80, 82 }, /* pc .. state */
88 { 84, 85 } /* fprs .. y */
91 #define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t))
93 static const struct regs_range_t fpregs_ranges
[] = {
94 { 32, 79 }, /* f0 .. f62 */
98 #define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t))
100 /* Defined in auto-generated file reg-sparc64.c. */
101 void init_registers_sparc64 (void);
104 sparc_cannot_store_register (int regno
)
106 return (regno
>= sparc_num_regs
|| sparc_regmap
[regno
] == -1);
110 sparc_cannot_fetch_register (int regno
)
112 return (regno
>= sparc_num_regs
|| sparc_regmap
[regno
] == -1);
116 sparc_fill_gregset_to_stack (struct regcache
*regcache
, const void *buf
)
120 unsigned char tmp_reg_buf
[8];
121 const int l0_regno
= find_regno("l0");
122 const int i7_regno
= l0_regno
+ 15;
124 /* These registers have to be stored in the stack. */
125 memcpy(&addr
, ((char *) buf
) + sparc_regmap
[find_regno("sp")], sizeof(addr
));
129 for (i
= l0_regno
; i
<= i7_regno
; i
++)
131 collect_register (regcache
, i
, tmp_reg_buf
);
132 (*the_target
->write_memory
) (addr
, tmp_reg_buf
, sizeof(tmp_reg_buf
));
133 addr
+= sizeof(tmp_reg_buf
);
138 sparc_fill_gregset (struct regcache
*regcache
, void *buf
)
143 for (range
= 0; range
< N_GREGS_RANGES
; range
++)
144 for (i
= gregs_ranges
[range
].regno_start
; i
<= gregs_ranges
[range
].regno_end
; i
++)
145 if (sparc_regmap
[i
] != -1)
146 collect_register (regcache
, i
, ((char *) buf
) + sparc_regmap
[i
]);
148 sparc_fill_gregset_to_stack (regcache
, buf
);
152 sparc_fill_fpregset (struct regcache
*regcache
, void *buf
)
157 for (range
= 0; range
< N_FPREGS_RANGES
; range
++)
158 for (i
= fpregs_ranges
[range
].regno_start
; i
<= fpregs_ranges
[range
].regno_end
; i
++)
159 collect_register (regcache
, i
, ((char *) buf
) + sparc_regmap
[i
]);
164 sparc_store_gregset_from_stack (struct regcache
*regcache
, const void *buf
)
168 unsigned char tmp_reg_buf
[8];
169 const int l0_regno
= find_regno("l0");
170 const int i7_regno
= l0_regno
+ 15;
172 /* These registers have to be obtained from the stack. */
173 memcpy(&addr
, ((char *) buf
) + sparc_regmap
[find_regno("sp")], sizeof(addr
));
177 for (i
= l0_regno
; i
<= i7_regno
; i
++)
179 (*the_target
->read_memory
) (addr
, tmp_reg_buf
, sizeof(tmp_reg_buf
));
180 supply_register (regcache
, i
, tmp_reg_buf
);
181 addr
+= sizeof(tmp_reg_buf
);
186 sparc_store_gregset (struct regcache
*regcache
, const void *buf
)
192 memset (zerobuf
, 0, sizeof(zerobuf
));
194 for (range
= 0; range
< N_GREGS_RANGES
; range
++)
195 for (i
= gregs_ranges
[range
].regno_start
; i
<= gregs_ranges
[range
].regno_end
; i
++)
196 if (sparc_regmap
[i
] != -1)
197 supply_register (regcache
, i
, ((char *) buf
) + sparc_regmap
[i
]);
199 supply_register (regcache
, i
, zerobuf
);
201 sparc_store_gregset_from_stack (regcache
, buf
);
205 sparc_store_fpregset (struct regcache
*regcache
, const void *buf
)
210 for (range
= 0; range
< N_FPREGS_RANGES
; range
++)
211 for (i
= fpregs_ranges
[range
].regno_start
;
212 i
<= fpregs_ranges
[range
].regno_end
;
214 supply_register (regcache
, i
, ((char *) buf
) + sparc_regmap
[i
]);
217 extern int debug_threads
;
220 sparc_get_pc (struct regcache
*regcache
)
223 collect_register_by_name (regcache
, "pc", &pc
);
225 fprintf (stderr
, "stop pc is %08lx\n", pc
);
229 static const unsigned char sparc_breakpoint
[INSN_SIZE
] = { 0x91, 0xd0, 0x20, 0x01 };
230 #define sparc_breakpoint_len INSN_SIZE
234 sparc_breakpoint_at (CORE_ADDR where
)
236 unsigned char insn
[INSN_SIZE
];
238 (*the_target
->read_memory
) (where
, (unsigned char *) insn
, sizeof(insn
));
240 if (memcmp(sparc_breakpoint
, insn
, sizeof(insn
)) == 0)
243 /* If necessary, recognize more trap instructions here. GDB only uses TRAP Always. */
248 /* We only place breakpoints in empty marker functions, and thread locking
249 is outside of the function. So rather than importing software single-step,
250 we can just run until exit. */
252 sparc_reinsert_addr (void)
254 struct regcache
*regcache
= get_thread_regcache (current_inferior
, 1);
256 /* O7 is the equivalent to the 'lr' of other archs. */
257 collect_register_by_name (regcache
, "o7", &lr
);
262 struct regset_info target_regsets
[] = {
263 { PTRACE_GETREGS
, PTRACE_SETREGS
, 0, sizeof (elf_gregset_t
),
265 sparc_fill_gregset
, sparc_store_gregset
},
266 { PTRACE_GETFPREGS
, PTRACE_SETFPREGS
, 0, sizeof (fpregset_t
),
268 sparc_fill_fpregset
, sparc_store_fpregset
},
269 { 0, 0, 0, -1, -1, NULL
, NULL
}
272 struct linux_target_ops the_low_target
= {
273 init_registers_sparc64
,
275 /* No regmap needs to be provided since this impl. doesn't use USRREGS. */
277 sparc_cannot_fetch_register
,
278 sparc_cannot_store_register
,
280 /* No sparc_set_pc is needed. */
282 (const unsigned char *) sparc_breakpoint
,
283 sparc_breakpoint_len
,
287 NULL
, NULL
, NULL
, NULL
,