1 /* Xtensa GNU/Linux native support.
3 Copyright (C) 2007-2018 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/>. */
26 #include "linux-nat.h"
27 #include <sys/types.h>
30 #include <sys/ioctl.h>
33 #include <sys/procfs.h>
34 #include "nat/gdb_ptrace.h"
35 #include <asm/ptrace.h>
38 #include "xtensa-tdep.h"
40 /* Defines ps_err_e, struct ps_prochandle. */
41 #include "gdb_proc_service.h"
43 /* Extended register set depends on hardware configs.
44 Keeping these definitions separately allows to introduce
45 hardware-specific overlays. */
46 #include "xtensa-xtregs.c"
48 class xtensa_linux_nat_target final : public linux_nat_target
51 /* Add our register access methods. */
52 void fetch_registers (struct regcache *, int) override;
53 void store_registers (struct regcache *, int) override;
56 static xtensa_linux_nat_target the_xtensa_linux_nat_target;
59 fill_gregset (const struct regcache *regcache,
60 gdb_gregset_t *gregsetp, int regnum)
63 xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp;
64 struct gdbarch *gdbarch = regcache->arch ();
66 if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1)
67 regcache_raw_collect (regcache, gdbarch_pc_regnum (gdbarch), ®s->pc);
68 if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1)
69 regcache_raw_collect (regcache, gdbarch_ps_regnum (gdbarch), ®s->ps);
71 if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1)
72 regcache_raw_collect (regcache,
73 gdbarch_tdep (gdbarch)->wb_regnum,
75 if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1)
76 regcache_raw_collect (regcache,
77 gdbarch_tdep (gdbarch)->ws_regnum,
79 if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1)
80 regcache_raw_collect (regcache,
81 gdbarch_tdep (gdbarch)->lbeg_regnum,
83 if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1)
84 regcache_raw_collect (regcache,
85 gdbarch_tdep (gdbarch)->lend_regnum,
87 if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1)
88 regcache_raw_collect (regcache,
89 gdbarch_tdep (gdbarch)->lcount_regnum,
91 if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1)
92 regcache_raw_collect (regcache,
93 gdbarch_tdep (gdbarch)->sar_regnum,
95 if (regnum == gdbarch_tdep (gdbarch)->threadptr_regnum || regnum == -1)
96 regcache_raw_collect (regcache,
97 gdbarch_tdep (gdbarch)->threadptr_regnum,
99 if (regnum >=gdbarch_tdep (gdbarch)->ar_base
100 && regnum < gdbarch_tdep (gdbarch)->ar_base
101 + gdbarch_tdep (gdbarch)->num_aregs)
102 regcache_raw_collect (regcache,regnum,
103 ®s->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
104 else if (regnum == -1)
106 for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
107 regcache_raw_collect (regcache,
108 gdbarch_tdep (gdbarch)->ar_base + i,
111 if (regnum >= gdbarch_tdep (gdbarch)->a0_base
112 && regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS)
113 regcache_raw_collect (regcache, regnum,
114 ®s->ar[(4 * regs->windowbase + regnum
115 - gdbarch_tdep (gdbarch)->a0_base)
116 % gdbarch_tdep (gdbarch)->num_aregs]);
117 else if (regnum == -1)
119 for (i = 0; i < C0_NREGS; ++i)
120 regcache_raw_collect (regcache,
121 gdbarch_tdep (gdbarch)->a0_base + i,
122 ®s->ar[(4 * regs->windowbase + i)
123 % gdbarch_tdep (gdbarch)->num_aregs]);
128 supply_gregset_reg (struct regcache *regcache,
129 const gdb_gregset_t *gregsetp, int regnum)
132 xtensa_elf_gregset_t *regs = (xtensa_elf_gregset_t *) gregsetp;
134 struct gdbarch *gdbarch = regcache->arch ();
136 if (regnum == gdbarch_pc_regnum (gdbarch) || regnum == -1)
137 regcache_raw_supply (regcache, gdbarch_pc_regnum (gdbarch), ®s->pc);
138 if (regnum == gdbarch_ps_regnum (gdbarch) || regnum == -1)
139 regcache_raw_supply (regcache, gdbarch_ps_regnum (gdbarch), ®s->ps);
141 if (regnum == gdbarch_tdep (gdbarch)->wb_regnum || regnum == -1)
142 regcache_raw_supply (regcache,
143 gdbarch_tdep (gdbarch)->wb_regnum,
145 if (regnum == gdbarch_tdep (gdbarch)->ws_regnum || regnum == -1)
146 regcache_raw_supply (regcache,
147 gdbarch_tdep (gdbarch)->ws_regnum,
149 if (regnum == gdbarch_tdep (gdbarch)->lbeg_regnum || regnum == -1)
150 regcache_raw_supply (regcache,
151 gdbarch_tdep (gdbarch)->lbeg_regnum,
153 if (regnum == gdbarch_tdep (gdbarch)->lend_regnum || regnum == -1)
154 regcache_raw_supply (regcache,
155 gdbarch_tdep (gdbarch)->lend_regnum,
157 if (regnum == gdbarch_tdep (gdbarch)->lcount_regnum || regnum == -1)
158 regcache_raw_supply (regcache,
159 gdbarch_tdep (gdbarch)->lcount_regnum,
161 if (regnum == gdbarch_tdep (gdbarch)->sar_regnum || regnum == -1)
162 regcache_raw_supply (regcache,
163 gdbarch_tdep (gdbarch)->sar_regnum,
165 if (regnum == gdbarch_tdep (gdbarch)->threadptr_regnum || regnum == -1)
166 regcache_raw_supply (regcache,
167 gdbarch_tdep (gdbarch)->threadptr_regnum,
169 if (regnum >=gdbarch_tdep (gdbarch)->ar_base
170 && regnum < gdbarch_tdep (gdbarch)->ar_base
171 + gdbarch_tdep (gdbarch)->num_aregs)
172 regcache_raw_supply (regcache,regnum,
173 ®s->ar[regnum - gdbarch_tdep (gdbarch)->ar_base]);
174 else if (regnum == -1)
176 for (i = 0; i < gdbarch_tdep (gdbarch)->num_aregs; ++i)
177 regcache_raw_supply (regcache,
178 gdbarch_tdep (gdbarch)->ar_base + i,
181 if (regnum >= gdbarch_tdep (gdbarch)->a0_base
182 && regnum < gdbarch_tdep (gdbarch)->a0_base + C0_NREGS)
183 regcache_raw_supply (regcache, regnum,
184 ®s->ar[(4 * regs->windowbase + regnum
185 - gdbarch_tdep (gdbarch)->a0_base)
186 % gdbarch_tdep (gdbarch)->num_aregs]);
187 else if (regnum == -1)
189 for (i = 0; i < C0_NREGS; ++i)
190 regcache_raw_supply (regcache,
191 gdbarch_tdep (gdbarch)->a0_base + i,
192 ®s->ar[(4 * regs->windowbase + i)
193 % gdbarch_tdep (gdbarch)->num_aregs]);
198 supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregsetp)
200 supply_gregset_reg (regcache, gregsetp, -1);
204 fill_fpregset (const struct regcache *regcache,
205 gdb_fpregset_t *fpregsetp, int regnum)
211 supply_fpregset (struct regcache *regcache,
212 const gdb_fpregset_t *fpregsetp)
217 /* Fetch greg-register(s) from process/thread TID
218 and store value(s) in GDB's register array. */
221 fetch_gregs (struct regcache *regcache, int regnum)
223 int tid = ptid_get_lwp (regcache->ptid ());
227 if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0)
229 perror_with_name (_("Couldn't get registers"));
233 supply_gregset_reg (regcache, ®s, regnum);
236 /* Store greg-register(s) in GDB's register
237 array into the process/thread specified by TID. */
240 store_gregs (struct regcache *regcache, int regnum)
242 int tid = ptid_get_lwp (regcache->ptid ());
246 if (ptrace (PTRACE_GETREGS, tid, 0, (long) ®s) < 0)
248 perror_with_name (_("Couldn't get registers"));
252 fill_gregset (regcache, ®s, regnum);
254 if (ptrace (PTRACE_SETREGS, tid, 0, (long) ®s) < 0)
256 perror_with_name (_("Couldn't write registers"));
262 static int xtreg_high;
264 /* Fetch/Store Xtensa TIE registers. Xtensa GNU/Linux PTRACE
265 interface provides special requests for this. */
268 fetch_xtregs (struct regcache *regcache, int regnum)
270 int tid = ptid_get_lwp (regcache->ptid ());
271 const xtensa_regtable_t *ptr;
272 char xtregs [XTENSA_ELF_XTREG_SIZE];
274 if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
275 perror_with_name (_("Couldn't get extended registers"));
277 for (ptr = xtensa_regmap_table; ptr->name; ptr++)
278 if (regnum == ptr->gdb_regnum || regnum == -1)
279 regcache_raw_supply (regcache, ptr->gdb_regnum,
280 xtregs + ptr->ptrace_offset);
284 store_xtregs (struct regcache *regcache, int regnum)
286 int tid = ptid_get_lwp (regcache->ptid ());
287 const xtensa_regtable_t *ptr;
288 char xtregs [XTENSA_ELF_XTREG_SIZE];
290 if (ptrace (PTRACE_GETXTREGS, tid, 0, (long)&xtregs) < 0)
291 perror_with_name (_("Couldn't get extended registers"));
293 for (ptr = xtensa_regmap_table; ptr->name; ptr++)
294 if (regnum == ptr->gdb_regnum || regnum == -1)
295 regcache_raw_collect (regcache, ptr->gdb_regnum,
296 xtregs + ptr->ptrace_offset);
298 if (ptrace (PTRACE_SETXTREGS, tid, 0, (long)&xtregs) < 0)
299 perror_with_name (_("Couldn't write extended registers"));
303 xtensa_linux_nat_target::fetch_registers (struct regcache *regcache,
308 fetch_gregs (regcache, regnum);
309 fetch_xtregs (regcache, regnum);
311 else if ((regnum < xtreg_lo) || (regnum > xtreg_high))
312 fetch_gregs (regcache, regnum);
314 fetch_xtregs (regcache, regnum);
318 xtensa_linux_nat_target::store_registers (struct regcache *regcache,
323 store_gregs (regcache, regnum);
324 store_xtregs (regcache, regnum);
326 else if ((regnum < xtreg_lo) || (regnum > xtreg_high))
327 store_gregs (regcache, regnum);
329 store_xtregs (regcache, regnum);
332 /* Called by libthread_db. */
335 ps_get_thread_area (struct ps_prochandle *ph,
336 lwpid_t lwpid, int idx, void **base)
338 xtensa_elf_gregset_t regs;
340 if (ptrace (PTRACE_GETREGS, lwpid, NULL, ®s) != 0)
343 /* IDX is the bias from the thread pointer to the beginning of the
344 thread descriptor. It has to be subtracted due to implementation
345 quirks in libthread_db. */
346 *base = (void *) ((char *) regs.threadptr - idx);
352 _initialize_xtensa_linux_nat (void)
354 const xtensa_regtable_t *ptr;
356 /* Calculate the number range for extended registers. */
357 xtreg_lo = 1000000000;
359 for (ptr = xtensa_regmap_table; ptr->name; ptr++)
361 if (ptr->gdb_regnum < xtreg_lo)
362 xtreg_lo = ptr->gdb_regnum;
363 if (ptr->gdb_regnum > xtreg_high)
364 xtreg_high = ptr->gdb_regnum;
367 linux_target = &the_xtensa_linux_nat_target;
368 add_inf_child_target (&the_xtensa_linux_nat_target);