1 /* GNU/Linux/Xtensa specific low level interface, for the remote server for GDB.
2 Copyright (C) 2007-2015 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 /* Defined in auto-generated file reg-xtensa.c. */
24 void init_registers_xtensa (void);
25 extern const struct target_desc *tdesc_xtensa;
27 #include <asm/ptrace.h>
28 #include <xtensa-config.h>
29 #include "arch/xtensa.h"
30 #include "gdb_proc_service.h"
32 #include "xtensa-xtregs.c"
36 R_LBEG, R_LEND, R_LCOUNT,
43 xtensa_fill_gregset (struct regcache *regcache, void *buf)
45 elf_greg_t* rset = (elf_greg_t*)buf;
46 const struct target_desc *tdesc = regcache->tdesc;
51 /* Take care of AR registers. */
53 ar0_regnum = find_regno (tdesc, "ar0");
54 ptr = (char*)&rset[R_A0];
56 for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++)
58 collect_register (regcache, i, ptr);
59 ptr += register_size (tdesc, i);
62 /* Loop registers, if hardware has it. */
65 collect_register_by_name (regcache, "lbeg", (char*)&rset[R_LBEG]);
66 collect_register_by_name (regcache, "lend", (char*)&rset[R_LEND]);
67 collect_register_by_name (regcache, "lcount", (char*)&rset[R_LCOUNT]);
70 collect_register_by_name (regcache, "sar", (char*)&rset[R_SAR]);
71 collect_register_by_name (regcache, "pc", (char*)&rset[R_PC]);
72 collect_register_by_name (regcache, "ps", (char*)&rset[R_PS]);
73 collect_register_by_name (regcache, "windowbase", (char*)&rset[R_WB]);
74 collect_register_by_name (regcache, "windowstart", (char*)&rset[R_WS]);
78 xtensa_store_gregset (struct regcache *regcache, const void *buf)
80 const elf_greg_t* rset = (const elf_greg_t*)buf;
81 const struct target_desc *tdesc = regcache->tdesc;
86 /* Take care of AR registers. */
88 ar0_regnum = find_regno (tdesc, "ar0");
89 ptr = (char *)&rset[R_A0];
91 for (i = ar0_regnum; i < ar0_regnum + XCHAL_NUM_AREGS; i++)
93 supply_register (regcache, i, ptr);
94 ptr += register_size (tdesc, i);
97 /* Loop registers, if hardware has it. */
100 supply_register_by_name (regcache, "lbeg", (char*)&rset[R_LBEG]);
101 supply_register_by_name (regcache, "lend", (char*)&rset[R_LEND]);
102 supply_register_by_name (regcache, "lcount", (char*)&rset[R_LCOUNT]);
105 supply_register_by_name (regcache, "sar", (char*)&rset[R_SAR]);
106 supply_register_by_name (regcache, "pc", (char*)&rset[R_PC]);
107 supply_register_by_name (regcache, "ps", (char*)&rset[R_PS]);
108 supply_register_by_name (regcache, "windowbase", (char*)&rset[R_WB]);
109 supply_register_by_name (regcache, "windowstart", (char*)&rset[R_WS]);
112 /* Xtensa GNU/Linux PTRACE interface includes extended register set. */
115 xtensa_fill_xtregset (struct regcache *regcache, void *buf)
117 const xtensa_regtable_t *ptr;
119 for (ptr = xtensa_regmap_table; ptr->name; ptr++)
121 collect_register_by_name (regcache, ptr->name,
122 (char*)buf + ptr->ptrace_offset);
127 xtensa_store_xtregset (struct regcache *regcache, const void *buf)
129 const xtensa_regtable_t *ptr;
131 for (ptr = xtensa_regmap_table; ptr->name; ptr++)
133 supply_register_by_name (regcache, ptr->name,
134 (char*)buf + ptr->ptrace_offset);
138 static struct regset_info xtensa_regsets[] = {
139 { PTRACE_GETREGS, PTRACE_SETREGS, 0, sizeof (elf_gregset_t),
141 xtensa_fill_gregset, xtensa_store_gregset },
142 { PTRACE_GETXTREGS, PTRACE_SETXTREGS, 0, XTENSA_ELF_XTREG_SIZE,
144 xtensa_fill_xtregset, xtensa_store_xtregset },
145 { 0, 0, 0, -1, -1, NULL, NULL }
149 #define XTENSA_BREAKPOINT {0xd2,0x0f}
151 #define XTENSA_BREAKPOINT {0x2d,0xf0}
154 static const gdb_byte xtensa_breakpoint[] = XTENSA_BREAKPOINT;
155 #define xtensa_breakpoint_len 2
157 /* Implementation of linux_target_ops method "sw_breakpoint_from_kind". */
159 static const gdb_byte *
160 xtensa_sw_breakpoint_from_kind (int kind, int *size)
162 *size = xtensa_breakpoint_len;
163 return xtensa_breakpoint;
167 xtensa_get_pc (struct regcache *regcache)
171 collect_register_by_name (regcache, "pc", &pc);
176 xtensa_set_pc (struct regcache *regcache, CORE_ADDR pc)
178 unsigned long newpc = pc;
179 supply_register_by_name (regcache, "pc", &newpc);
183 xtensa_breakpoint_at (CORE_ADDR where)
187 (*the_target->read_memory) (where, (unsigned char *) &insn,
188 xtensa_breakpoint_len);
189 return memcmp((char *) &insn,
190 xtensa_breakpoint, xtensa_breakpoint_len) == 0;
193 /* Called by libthread_db. */
196 ps_get_thread_area (const struct ps_prochandle *ph,
197 lwpid_t lwpid, int idx, void **base)
199 xtensa_elf_gregset_t regs;
201 if (ptrace (PTRACE_GETREGS, lwpid, NULL, ®s) != 0)
204 /* IDX is the bias from the thread pointer to the beginning of the
205 thread descriptor. It has to be subtracted due to implementation
206 quirks in libthread_db. */
207 *base = (void *) ((char *) regs.threadptr - idx);
212 static struct regsets_info xtensa_regsets_info =
214 xtensa_regsets, /* regsets */
216 NULL, /* disabled_regsets */
219 static struct regs_info regs_info =
221 NULL, /* regset_bitmap */
227 xtensa_arch_setup (void)
229 current_process ()->tdesc = tdesc_xtensa;
232 static const struct regs_info *
233 xtensa_regs_info (void)
238 struct linux_target_ops the_low_target = {
243 NULL, /* fetch_register */
246 NULL, /* breakpoint_kind_from_pc */
247 xtensa_sw_breakpoint_from_kind,
250 xtensa_breakpoint_at,
255 initialize_low_arch (void)
257 /* Initialize the Linux target descriptions. */
258 init_registers_xtensa ();
260 initialize_regsets_info (&xtensa_regsets_info);