1 /* GNU/Linux/Xtensa specific low level interface, for the remote server for GDB.
2 Copyright (C) 2007-2020 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/>. */
21 #include "linux-low.h"
23 /* Linux target op definitions for the Xtensa architecture. */
25 class xtensa_target
: public linux_process_target
31 void low_arch_setup () override
;
34 /* The singleton target ops object. */
36 static xtensa_target the_xtensa_target
;
38 /* Defined in auto-generated file reg-xtensa.c. */
39 void init_registers_xtensa (void);
40 extern const struct target_desc
*tdesc_xtensa
;
42 #include <asm/ptrace.h>
43 #include <xtensa-config.h>
44 #include "arch/xtensa.h"
45 #include "gdb_proc_service.h"
47 #include "xtensa-xtregs.c"
51 R_LBEG
, R_LEND
, R_LCOUNT
,
59 xtensa_fill_gregset (struct regcache
*regcache
, void *buf
)
61 elf_greg_t
* rset
= (elf_greg_t
*)buf
;
62 const struct target_desc
*tdesc
= regcache
->tdesc
;
67 /* Take care of AR registers. */
69 ar0_regnum
= find_regno (tdesc
, "ar0");
70 ptr
= (char*)&rset
[R_A0
];
72 for (i
= ar0_regnum
; i
< ar0_regnum
+ XCHAL_NUM_AREGS
; i
++)
74 collect_register (regcache
, i
, ptr
);
75 ptr
+= register_size (tdesc
, i
);
78 if (XSHAL_ABI
== XTHAL_ABI_CALL0
)
80 int a0_regnum
= find_regno (tdesc
, "a0");
81 ptr
= (char *) &rset
[R_A0
+ 4 * rset
[R_WB
]];
83 for (i
= a0_regnum
; i
< a0_regnum
+ C0_NREGS
; i
++)
85 if ((4 * rset
[R_WB
] + i
- a0_regnum
) == XCHAL_NUM_AREGS
)
86 ptr
= (char *) &rset
[R_A0
];
87 collect_register (regcache
, i
, ptr
);
88 ptr
+= register_size (tdesc
, i
);
92 /* Loop registers, if hardware has it. */
95 collect_register_by_name (regcache
, "lbeg", (char*)&rset
[R_LBEG
]);
96 collect_register_by_name (regcache
, "lend", (char*)&rset
[R_LEND
]);
97 collect_register_by_name (regcache
, "lcount", (char*)&rset
[R_LCOUNT
]);
100 collect_register_by_name (regcache
, "sar", (char*)&rset
[R_SAR
]);
101 collect_register_by_name (regcache
, "pc", (char*)&rset
[R_PC
]);
102 collect_register_by_name (regcache
, "ps", (char*)&rset
[R_PS
]);
103 collect_register_by_name (regcache
, "windowbase", (char*)&rset
[R_WB
]);
104 collect_register_by_name (regcache
, "windowstart", (char*)&rset
[R_WS
]);
106 #if XCHAL_HAVE_THREADPTR
107 collect_register_by_name (regcache
, "threadptr",
108 (char *) &rset
[R_THREADPTR
]);
113 xtensa_store_gregset (struct regcache
*regcache
, const void *buf
)
115 const elf_greg_t
* rset
= (const elf_greg_t
*)buf
;
116 const struct target_desc
*tdesc
= regcache
->tdesc
;
121 /* Take care of AR registers. */
123 ar0_regnum
= find_regno (tdesc
, "ar0");
124 ptr
= (char *)&rset
[R_A0
];
126 for (i
= ar0_regnum
; i
< ar0_regnum
+ XCHAL_NUM_AREGS
; i
++)
128 supply_register (regcache
, i
, ptr
);
129 ptr
+= register_size (tdesc
, i
);
132 if (XSHAL_ABI
== XTHAL_ABI_CALL0
)
134 int a0_regnum
= find_regno (tdesc
, "a0");
135 ptr
= (char *) &rset
[R_A0
+ (4 * rset
[R_WB
]) % XCHAL_NUM_AREGS
];
137 for (i
= a0_regnum
; i
< a0_regnum
+ C0_NREGS
; i
++)
139 if ((4 * rset
[R_WB
] + i
- a0_regnum
) == XCHAL_NUM_AREGS
)
140 ptr
= (char *) &rset
[R_A0
];
141 supply_register (regcache
, i
, ptr
);
142 ptr
+= register_size (tdesc
, i
);
146 /* Loop registers, if hardware has it. */
149 supply_register_by_name (regcache
, "lbeg", (char*)&rset
[R_LBEG
]);
150 supply_register_by_name (regcache
, "lend", (char*)&rset
[R_LEND
]);
151 supply_register_by_name (regcache
, "lcount", (char*)&rset
[R_LCOUNT
]);
154 supply_register_by_name (regcache
, "sar", (char*)&rset
[R_SAR
]);
155 supply_register_by_name (regcache
, "pc", (char*)&rset
[R_PC
]);
156 supply_register_by_name (regcache
, "ps", (char*)&rset
[R_PS
]);
157 supply_register_by_name (regcache
, "windowbase", (char*)&rset
[R_WB
]);
158 supply_register_by_name (regcache
, "windowstart", (char*)&rset
[R_WS
]);
160 #if XCHAL_HAVE_THREADPTR
161 supply_register_by_name (regcache
, "threadptr",
162 (char *) &rset
[R_THREADPTR
]);
166 /* Xtensa GNU/Linux PTRACE interface includes extended register set. */
169 xtensa_fill_xtregset (struct regcache
*regcache
, void *buf
)
171 const xtensa_regtable_t
*ptr
;
173 for (ptr
= xtensa_regmap_table
; ptr
->name
; ptr
++)
175 collect_register_by_name (regcache
, ptr
->name
,
176 (char*)buf
+ ptr
->ptrace_offset
);
181 xtensa_store_xtregset (struct regcache
*regcache
, const void *buf
)
183 const xtensa_regtable_t
*ptr
;
185 for (ptr
= xtensa_regmap_table
; ptr
->name
; ptr
++)
187 supply_register_by_name (regcache
, ptr
->name
,
188 (char*)buf
+ ptr
->ptrace_offset
);
192 static struct regset_info xtensa_regsets
[] = {
193 { PTRACE_GETREGS
, PTRACE_SETREGS
, 0, sizeof (elf_gregset_t
),
195 xtensa_fill_gregset
, xtensa_store_gregset
},
196 { PTRACE_GETXTREGS
, PTRACE_SETXTREGS
, 0, XTENSA_ELF_XTREG_SIZE
,
198 xtensa_fill_xtregset
, xtensa_store_xtregset
},
203 #define XTENSA_BREAKPOINT {0xd2,0x0f}
205 #define XTENSA_BREAKPOINT {0x2d,0xf0}
208 static const gdb_byte xtensa_breakpoint
[] = XTENSA_BREAKPOINT
;
209 #define xtensa_breakpoint_len 2
211 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */
213 static const gdb_byte
*
214 xtensa_sw_breakpoint_from_kind (int kind
, int *size
)
216 *size
= xtensa_breakpoint_len
;
217 return xtensa_breakpoint
;
221 xtensa_breakpoint_at (CORE_ADDR where
)
225 the_target
->read_memory (where
, (unsigned char *) &insn
,
226 xtensa_breakpoint_len
);
227 return memcmp((char *) &insn
,
228 xtensa_breakpoint
, xtensa_breakpoint_len
) == 0;
231 /* Called by libthread_db. */
234 ps_get_thread_area (struct ps_prochandle
*ph
,
235 lwpid_t lwpid
, int idx
, void **base
)
237 xtensa_elf_gregset_t regs
;
239 if (ptrace (PTRACE_GETREGS
, lwpid
, NULL
, ®s
) != 0)
242 /* IDX is the bias from the thread pointer to the beginning of the
243 thread descriptor. It has to be subtracted due to implementation
244 quirks in libthread_db. */
245 *base
= (void *) ((char *) regs
.threadptr
- idx
);
250 static struct regsets_info xtensa_regsets_info
=
252 xtensa_regsets
, /* regsets */
254 NULL
, /* disabled_regsets */
257 static struct regs_info regs_info
=
259 NULL
, /* regset_bitmap */
265 xtensa_target::low_arch_setup ()
267 current_process ()->tdesc
= tdesc_xtensa
;
270 /* Support for hardware single step. */
273 xtensa_supports_hardware_single_step (void)
278 static const struct regs_info
*
279 xtensa_regs_info (void)
284 struct linux_target_ops the_low_target
= {
288 NULL
, /* fetch_register */
291 NULL
, /* breakpoint_kind_from_pc */
292 xtensa_sw_breakpoint_from_kind
,
295 xtensa_breakpoint_at
,
296 NULL
, /* supports_z_point_type */
297 NULL
, /* insert_point */
298 NULL
, /* remove_point */
299 NULL
, /* stopped_by_watchpoint */
300 NULL
, /* stopped_data_address */
301 NULL
, /* collect_ptrace_register */
302 NULL
, /* supply_ptrace_register */
303 NULL
, /* siginfo_fixup */
304 NULL
, /* new_process */
305 NULL
, /* delete_process */
306 NULL
, /* new_thread */
307 NULL
, /* delete_thread */
309 NULL
, /* prepare_to_resume */
310 NULL
, /* process_qsupported */
311 NULL
, /* supports_tracepoints */
312 NULL
, /* get_thread_area */
313 NULL
, /* install_fast_tracepoint_jump_pad */
315 NULL
, /* get_min_fast_tracepoint_insn_len */
316 NULL
, /* supports_range_stepping */
317 NULL
, /* breakpoint_kind_from_current_state */
318 xtensa_supports_hardware_single_step
,
321 /* The linux target ops object. */
323 linux_process_target
*the_linux_target
= &the_xtensa_target
;
326 initialize_low_arch (void)
328 /* Initialize the Linux target descriptions. */
329 init_registers_xtensa ();
331 initialize_regsets_info (&xtensa_regsets_info
);