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 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 (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 (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 (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 (i, ((char *) buf) + sparc_regmap[i]);
148 sparc_fill_gregset_to_stack (buf);
152 sparc_fill_fpregset (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 (i, ((char *) buf) + sparc_regmap[i]);
164 sparc_store_gregset_from_stack (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 (i, tmp_reg_buf);
181 addr += sizeof(tmp_reg_buf);
186 sparc_store_gregset (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 (i, ((char *) buf) + sparc_regmap[i]);
199 supply_register (i, zerobuf);
201 sparc_store_gregset_from_stack (buf);
205 sparc_store_fpregset (const void *buf)
210 for (range = 0; range < N_FPREGS_RANGES; range++)
211 for (i = fpregs_ranges[range].regno_start; i <= fpregs_ranges[range].regno_end; i++)
212 supply_register (i, ((char *) buf) + sparc_regmap[i]);
215 extern int debug_threads;
221 collect_register_by_name ("pc", &pc);
223 fprintf (stderr, "stop pc is %08lx\n", pc);
227 static const unsigned char sparc_breakpoint[INSN_SIZE] = { 0x91, 0xd0, 0x20, 0x01 };
228 #define sparc_breakpoint_len INSN_SIZE
232 sparc_breakpoint_at (CORE_ADDR where)
234 unsigned char insn[INSN_SIZE];
236 (*the_target->read_memory) (where, (unsigned char *) insn, sizeof(insn));
238 if (memcmp(sparc_breakpoint, insn, sizeof(insn)) == 0)
241 /* If necessary, recognize more trap instructions here. GDB only uses TRAP Always. */
246 /* We only place breakpoints in empty marker functions, and thread locking
247 is outside of the function. So rather than importing software single-step,
248 we can just run until exit. */
250 sparc_reinsert_addr ()
253 /* O7 is the equivalent to the 'lr' of other archs. */
254 collect_register_by_name ("o7", &lr);
259 struct regset_info target_regsets[] = {
260 { PTRACE_GETREGS, PTRACE_SETREGS, sizeof (elf_gregset_t),
262 sparc_fill_gregset, sparc_store_gregset },
263 { PTRACE_GETFPREGS, PTRACE_SETFPREGS, sizeof (fpregset_t),
265 sparc_fill_fpregset, sparc_store_fpregset },
266 { 0, 0, -1, -1, NULL, NULL }
269 struct linux_target_ops the_low_target = {
270 init_registers_sparc64,
272 /* No regmap needs to be provided since this impl. doesn't use USRREGS. */
274 sparc_cannot_fetch_register,
275 sparc_cannot_store_register,
277 /* No sparc_set_pc is needed. */
279 (const unsigned char *) sparc_breakpoint,
280 sparc_breakpoint_len,
284 NULL, NULL, NULL, NULL,