1 /* Low level interface to ptrace, for the remote server for GDB.
2 Copyright (C) 1995-2020 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 "nat/gdb_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 /* Linux target op definitions for the SPARC architecture. */
47 class sparc_target
: public linux_process_target
51 const regs_info
*get_regs_info () override
;
55 void low_arch_setup () override
;
57 bool low_cannot_fetch_register (int regno
) override
;
59 bool low_cannot_store_register (int regno
) override
;
61 bool low_supports_breakpoints () override
;
63 CORE_ADDR
low_get_pc (regcache
*regcache
) override
;
65 /* No low_set_pc is needed. */
68 /* The singleton target ops object. */
70 static sparc_target the_sparc_target
;
73 sparc_target::low_supports_breakpoints ()
79 sparc_target::low_get_pc (regcache
*regcache
)
81 return linux_get_pc_64bit (regcache
);
84 /* Each offset is multiplied by 8, because of the register size.
85 These offsets apply to the buffer sent/filled by ptrace.
86 Additionally, the array elements order corresponds to the .dat file, and the
87 gdb's registers enumeration order. */
89 static int sparc_regmap
[] = {
90 /* These offsets correspond to GET/SETREGSET. */
91 -1, 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, /* g0 .. g7 */
92 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, /* o0 .. o5, sp, o7 */
93 -1, -1, -1, -1, -1, -1, -1, -1, /* l0 .. l7 */
94 -1, -1, -1, -1, -1, -1, -1, -1, /* i0 .. i5, fp, i7 */
96 /* Floating point registers offsets correspond to GET/SETFPREGSET. */
97 0*4, 1*4, 2*4, 3*4, 4*4, 5*4, 6*4, 7*4, /* f0 .. f7 */
98 8*4, 9*4, 10*4, 11*4, 12*4, 13*4, 14*4, 15*4, /* f8 .. f15 */
99 16*4, 17*4, 18*4, 19*4, 20*4, 21*4, 22*4, 23*4, /* f16 .. f23 */
100 24*4, 25*4, 26*4, 27*4, 28*4, 29*4, 30*4, 31*4, /* f24 .. f31 */
102 /* F32 offset starts next to f31: 31*4+4 = 16 * 8. */
103 16*8, 17*8, 18*8, 19*8, 20*8, 21*8, 22*8, 23*8, /* f32 .. f46 */
104 24*8, 25*8, 26*8, 27*8, 28*8, 29*8, 30*8, 31*8, /* f48 .. f62 */
109 /* FSR offset also corresponds to GET/SETFPREGSET, ans is placed
113 /* Y register is 32-bits length, but gdb takes care of that. */
125 static const struct regs_range_t gregs_ranges
[] = {
126 { 0, 31 }, /* g0 .. i7 */
127 { 80, 82 }, /* pc .. state */
128 { 84, 85 } /* fprs .. y */
131 #define N_GREGS_RANGES (sizeof (gregs_ranges) / sizeof (struct regs_range_t))
133 static const struct regs_range_t fpregs_ranges
[] = {
134 { 32, 79 }, /* f0 .. f62 */
138 #define N_FPREGS_RANGES (sizeof (fpregs_ranges) / sizeof (struct regs_range_t))
140 /* Defined in auto-generated file reg-sparc64.c. */
141 void init_registers_sparc64 (void);
142 extern const struct target_desc
*tdesc_sparc64
;
145 sparc_target::low_cannot_store_register (int regno
)
147 return (regno
>= sparc_num_regs
|| sparc_regmap
[regno
] == -1);
151 sparc_target::low_cannot_fetch_register (int regno
)
153 return (regno
>= sparc_num_regs
|| sparc_regmap
[regno
] == -1);
157 sparc_fill_gregset_to_stack (struct regcache
*regcache
, const void *buf
)
161 unsigned char tmp_reg_buf
[8];
162 const int l0_regno
= find_regno (regcache
->tdesc
, "l0");
163 const int i7_regno
= l0_regno
+ 15;
165 /* These registers have to be stored in the stack. */
167 ((char *) buf
) + sparc_regmap
[find_regno (regcache
->tdesc
, "sp")],
172 for (i
= l0_regno
; i
<= i7_regno
; i
++)
174 collect_register (regcache
, i
, tmp_reg_buf
);
175 the_target
->write_memory (addr
, tmp_reg_buf
, sizeof (tmp_reg_buf
));
176 addr
+= sizeof (tmp_reg_buf
);
181 sparc_fill_gregset (struct regcache
*regcache
, void *buf
)
186 for (range
= 0; range
< N_GREGS_RANGES
; range
++)
187 for (i
= gregs_ranges
[range
].regno_start
;
188 i
<= gregs_ranges
[range
].regno_end
; i
++)
189 if (sparc_regmap
[i
] != -1)
190 collect_register (regcache
, i
, ((char *) buf
) + sparc_regmap
[i
]);
192 sparc_fill_gregset_to_stack (regcache
, buf
);
196 sparc_fill_fpregset (struct regcache
*regcache
, void *buf
)
201 for (range
= 0; range
< N_FPREGS_RANGES
; range
++)
202 for (i
= fpregs_ranges
[range
].regno_start
;
203 i
<= fpregs_ranges
[range
].regno_end
; i
++)
204 collect_register (regcache
, i
, ((char *) buf
) + sparc_regmap
[i
]);
209 sparc_store_gregset_from_stack (struct regcache
*regcache
, const void *buf
)
213 unsigned char tmp_reg_buf
[8];
214 const int l0_regno
= find_regno (regcache
->tdesc
, "l0");
215 const int i7_regno
= l0_regno
+ 15;
217 /* These registers have to be obtained from the stack. */
219 ((char *) buf
) + sparc_regmap
[find_regno (regcache
->tdesc
, "sp")],
224 for (i
= l0_regno
; i
<= i7_regno
; i
++)
226 the_target
->read_memory (addr
, tmp_reg_buf
, sizeof (tmp_reg_buf
));
227 supply_register (regcache
, i
, tmp_reg_buf
);
228 addr
+= sizeof (tmp_reg_buf
);
233 sparc_store_gregset (struct regcache
*regcache
, const void *buf
)
239 memset (zerobuf
, 0, sizeof (zerobuf
));
241 for (range
= 0; range
< N_GREGS_RANGES
; range
++)
242 for (i
= gregs_ranges
[range
].regno_start
;
243 i
<= gregs_ranges
[range
].regno_end
; i
++)
244 if (sparc_regmap
[i
] != -1)
245 supply_register (regcache
, i
, ((char *) buf
) + sparc_regmap
[i
]);
247 supply_register (regcache
, i
, zerobuf
);
249 sparc_store_gregset_from_stack (regcache
, buf
);
253 sparc_store_fpregset (struct regcache
*regcache
, const void *buf
)
258 for (range
= 0; range
< N_FPREGS_RANGES
; range
++)
259 for (i
= fpregs_ranges
[range
].regno_start
;
260 i
<= fpregs_ranges
[range
].regno_end
;
262 supply_register (regcache
, i
, ((char *) buf
) + sparc_regmap
[i
]);
265 static const gdb_byte sparc_breakpoint
[INSN_SIZE
] = {
266 0x91, 0xd0, 0x20, 0x01
268 #define sparc_breakpoint_len INSN_SIZE
270 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */
272 static const unsigned char *
273 sparc_sw_breakpoint_from_kind (int kind
, int *size
)
275 *size
= sparc_breakpoint_len
;
276 return sparc_breakpoint
;
280 sparc_breakpoint_at (CORE_ADDR where
)
282 unsigned char insn
[INSN_SIZE
];
284 the_target
->read_memory (where
, (unsigned char *) insn
, sizeof (insn
));
286 if (memcmp (sparc_breakpoint
, insn
, sizeof (insn
)) == 0)
289 /* If necessary, recognize more trap instructions here. GDB only
296 sparc_target::low_arch_setup ()
298 current_process ()->tdesc
= tdesc_sparc64
;
301 static struct regset_info sparc_regsets
[] = {
302 { PTRACE_GETREGS
, PTRACE_SETREGS
, 0, sizeof (elf_gregset_t
),
304 sparc_fill_gregset
, sparc_store_gregset
},
305 { PTRACE_GETFPREGS
, PTRACE_SETFPREGS
, 0, sizeof (fpregset_t
),
307 sparc_fill_fpregset
, sparc_store_fpregset
},
311 static struct regsets_info sparc_regsets_info
=
313 sparc_regsets
, /* regsets */
315 NULL
, /* disabled_regsets */
318 static struct usrregs_info sparc_usrregs_info
=
321 /* No regmap needs to be provided since this impl. doesn't use
326 static struct regs_info myregs_info
=
328 NULL
, /* regset_bitmap */
334 sparc_target::get_regs_info ()
339 struct linux_target_ops the_low_target
= {
340 sparc_sw_breakpoint_from_kind
,
341 NULL
, /* get_next_pcs */
344 NULL
, /* supports_z_point_type */
345 NULL
, NULL
, NULL
, NULL
,
349 /* The linux target ops object. */
351 linux_process_target
*the_linux_target
= &the_sparc_target
;
354 initialize_low_arch (void)
356 /* Initialize the Linux target descriptions. */
357 init_registers_sparc64 ();
359 initialize_regsets_info (&sparc_regsets_info
);