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
29 const regs_info
*get_regs_info () override
;
33 void low_arch_setup () override
;
36 /* The singleton target ops object. */
38 static xtensa_target the_xtensa_target
;
40 /* Defined in auto-generated file reg-xtensa.c. */
41 void init_registers_xtensa (void);
42 extern const struct target_desc
*tdesc_xtensa
;
44 #include <asm/ptrace.h>
45 #include <xtensa-config.h>
46 #include "arch/xtensa.h"
47 #include "gdb_proc_service.h"
49 #include "xtensa-xtregs.c"
53 R_LBEG
, R_LEND
, R_LCOUNT
,
61 xtensa_fill_gregset (struct regcache
*regcache
, void *buf
)
63 elf_greg_t
* rset
= (elf_greg_t
*)buf
;
64 const struct target_desc
*tdesc
= regcache
->tdesc
;
69 /* Take care of AR registers. */
71 ar0_regnum
= find_regno (tdesc
, "ar0");
72 ptr
= (char*)&rset
[R_A0
];
74 for (i
= ar0_regnum
; i
< ar0_regnum
+ XCHAL_NUM_AREGS
; i
++)
76 collect_register (regcache
, i
, ptr
);
77 ptr
+= register_size (tdesc
, i
);
80 if (XSHAL_ABI
== XTHAL_ABI_CALL0
)
82 int a0_regnum
= find_regno (tdesc
, "a0");
83 ptr
= (char *) &rset
[R_A0
+ 4 * rset
[R_WB
]];
85 for (i
= a0_regnum
; i
< a0_regnum
+ C0_NREGS
; i
++)
87 if ((4 * rset
[R_WB
] + i
- a0_regnum
) == XCHAL_NUM_AREGS
)
88 ptr
= (char *) &rset
[R_A0
];
89 collect_register (regcache
, i
, ptr
);
90 ptr
+= register_size (tdesc
, i
);
94 /* Loop registers, if hardware has it. */
97 collect_register_by_name (regcache
, "lbeg", (char*)&rset
[R_LBEG
]);
98 collect_register_by_name (regcache
, "lend", (char*)&rset
[R_LEND
]);
99 collect_register_by_name (regcache
, "lcount", (char*)&rset
[R_LCOUNT
]);
102 collect_register_by_name (regcache
, "sar", (char*)&rset
[R_SAR
]);
103 collect_register_by_name (regcache
, "pc", (char*)&rset
[R_PC
]);
104 collect_register_by_name (regcache
, "ps", (char*)&rset
[R_PS
]);
105 collect_register_by_name (regcache
, "windowbase", (char*)&rset
[R_WB
]);
106 collect_register_by_name (regcache
, "windowstart", (char*)&rset
[R_WS
]);
108 #if XCHAL_HAVE_THREADPTR
109 collect_register_by_name (regcache
, "threadptr",
110 (char *) &rset
[R_THREADPTR
]);
115 xtensa_store_gregset (struct regcache
*regcache
, const void *buf
)
117 const elf_greg_t
* rset
= (const elf_greg_t
*)buf
;
118 const struct target_desc
*tdesc
= regcache
->tdesc
;
123 /* Take care of AR registers. */
125 ar0_regnum
= find_regno (tdesc
, "ar0");
126 ptr
= (char *)&rset
[R_A0
];
128 for (i
= ar0_regnum
; i
< ar0_regnum
+ XCHAL_NUM_AREGS
; i
++)
130 supply_register (regcache
, i
, ptr
);
131 ptr
+= register_size (tdesc
, i
);
134 if (XSHAL_ABI
== XTHAL_ABI_CALL0
)
136 int a0_regnum
= find_regno (tdesc
, "a0");
137 ptr
= (char *) &rset
[R_A0
+ (4 * rset
[R_WB
]) % XCHAL_NUM_AREGS
];
139 for (i
= a0_regnum
; i
< a0_regnum
+ C0_NREGS
; i
++)
141 if ((4 * rset
[R_WB
] + i
- a0_regnum
) == XCHAL_NUM_AREGS
)
142 ptr
= (char *) &rset
[R_A0
];
143 supply_register (regcache
, i
, ptr
);
144 ptr
+= register_size (tdesc
, i
);
148 /* Loop registers, if hardware has it. */
151 supply_register_by_name (regcache
, "lbeg", (char*)&rset
[R_LBEG
]);
152 supply_register_by_name (regcache
, "lend", (char*)&rset
[R_LEND
]);
153 supply_register_by_name (regcache
, "lcount", (char*)&rset
[R_LCOUNT
]);
156 supply_register_by_name (regcache
, "sar", (char*)&rset
[R_SAR
]);
157 supply_register_by_name (regcache
, "pc", (char*)&rset
[R_PC
]);
158 supply_register_by_name (regcache
, "ps", (char*)&rset
[R_PS
]);
159 supply_register_by_name (regcache
, "windowbase", (char*)&rset
[R_WB
]);
160 supply_register_by_name (regcache
, "windowstart", (char*)&rset
[R_WS
]);
162 #if XCHAL_HAVE_THREADPTR
163 supply_register_by_name (regcache
, "threadptr",
164 (char *) &rset
[R_THREADPTR
]);
168 /* Xtensa GNU/Linux PTRACE interface includes extended register set. */
171 xtensa_fill_xtregset (struct regcache
*regcache
, void *buf
)
173 const xtensa_regtable_t
*ptr
;
175 for (ptr
= xtensa_regmap_table
; ptr
->name
; ptr
++)
177 collect_register_by_name (regcache
, ptr
->name
,
178 (char*)buf
+ ptr
->ptrace_offset
);
183 xtensa_store_xtregset (struct regcache
*regcache
, const void *buf
)
185 const xtensa_regtable_t
*ptr
;
187 for (ptr
= xtensa_regmap_table
; ptr
->name
; ptr
++)
189 supply_register_by_name (regcache
, ptr
->name
,
190 (char*)buf
+ ptr
->ptrace_offset
);
194 static struct regset_info xtensa_regsets
[] = {
195 { PTRACE_GETREGS
, PTRACE_SETREGS
, 0, sizeof (elf_gregset_t
),
197 xtensa_fill_gregset
, xtensa_store_gregset
},
198 { PTRACE_GETXTREGS
, PTRACE_SETXTREGS
, 0, XTENSA_ELF_XTREG_SIZE
,
200 xtensa_fill_xtregset
, xtensa_store_xtregset
},
205 #define XTENSA_BREAKPOINT {0xd2,0x0f}
207 #define XTENSA_BREAKPOINT {0x2d,0xf0}
210 static const gdb_byte xtensa_breakpoint
[] = XTENSA_BREAKPOINT
;
211 #define xtensa_breakpoint_len 2
213 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */
215 static const gdb_byte
*
216 xtensa_sw_breakpoint_from_kind (int kind
, int *size
)
218 *size
= xtensa_breakpoint_len
;
219 return xtensa_breakpoint
;
223 xtensa_breakpoint_at (CORE_ADDR where
)
227 the_target
->read_memory (where
, (unsigned char *) &insn
,
228 xtensa_breakpoint_len
);
229 return memcmp((char *) &insn
,
230 xtensa_breakpoint
, xtensa_breakpoint_len
) == 0;
233 /* Called by libthread_db. */
236 ps_get_thread_area (struct ps_prochandle
*ph
,
237 lwpid_t lwpid
, int idx
, void **base
)
239 xtensa_elf_gregset_t regs
;
241 if (ptrace (PTRACE_GETREGS
, lwpid
, NULL
, ®s
) != 0)
244 /* IDX is the bias from the thread pointer to the beginning of the
245 thread descriptor. It has to be subtracted due to implementation
246 quirks in libthread_db. */
247 *base
= (void *) ((char *) regs
.threadptr
- idx
);
252 static struct regsets_info xtensa_regsets_info
=
254 xtensa_regsets
, /* regsets */
256 NULL
, /* disabled_regsets */
259 static struct regs_info myregs_info
=
261 NULL
, /* regset_bitmap */
267 xtensa_target::low_arch_setup ()
269 current_process ()->tdesc
= tdesc_xtensa
;
272 /* Support for hardware single step. */
275 xtensa_supports_hardware_single_step (void)
281 xtensa_target::get_regs_info ()
286 struct linux_target_ops the_low_target
= {
289 NULL
, /* fetch_register */
292 NULL
, /* breakpoint_kind_from_pc */
293 xtensa_sw_breakpoint_from_kind
,
296 xtensa_breakpoint_at
,
297 NULL
, /* supports_z_point_type */
298 NULL
, /* insert_point */
299 NULL
, /* remove_point */
300 NULL
, /* stopped_by_watchpoint */
301 NULL
, /* stopped_data_address */
302 NULL
, /* collect_ptrace_register */
303 NULL
, /* supply_ptrace_register */
304 NULL
, /* siginfo_fixup */
305 NULL
, /* new_process */
306 NULL
, /* delete_process */
307 NULL
, /* new_thread */
308 NULL
, /* delete_thread */
310 NULL
, /* prepare_to_resume */
311 NULL
, /* process_qsupported */
312 NULL
, /* supports_tracepoints */
313 NULL
, /* get_thread_area */
314 NULL
, /* install_fast_tracepoint_jump_pad */
316 NULL
, /* get_min_fast_tracepoint_insn_len */
317 NULL
, /* supports_range_stepping */
318 NULL
, /* breakpoint_kind_from_current_state */
319 xtensa_supports_hardware_single_step
,
322 /* The linux target ops object. */
324 linux_process_target
*the_linux_target
= &the_xtensa_target
;
327 initialize_low_arch (void)
329 /* Initialize the Linux target descriptions. */
330 init_registers_xtensa ();
332 initialize_regsets_info (&xtensa_regsets_info
);