diff options
Diffstat (limited to 'meta/recipes-devtools/gdb/gdb/0015-gdb-Add-native-support-for-ARC-in-GNU-Linux.patch')
-rw-r--r-- | meta/recipes-devtools/gdb/gdb/0015-gdb-Add-native-support-for-ARC-in-GNU-Linux.patch | 414 |
1 files changed, 414 insertions, 0 deletions
diff --git a/meta/recipes-devtools/gdb/gdb/0015-gdb-Add-native-support-for-ARC-in-GNU-Linux.patch b/meta/recipes-devtools/gdb/gdb/0015-gdb-Add-native-support-for-ARC-in-GNU-Linux.patch new file mode 100644 index 0000000000..31cf0b0be2 --- /dev/null +++ b/meta/recipes-devtools/gdb/gdb/0015-gdb-Add-native-support-for-ARC-in-GNU-Linux.patch | |||
@@ -0,0 +1,414 @@ | |||
1 | From 32b366249fd42d74cbc4a91039431554ebadcfd0 Mon Sep 17 00:00:00 2001 | ||
2 | From: Anton Kolesov <anton.kolesov@synopsys.com> | ||
3 | Date: Fri, 14 Feb 2014 11:56:23 +0400 | ||
4 | Subject: [PATCH 4/4] gdb: Add native support for ARC in GNU/Linux | ||
5 | |||
6 | With this patch in place it is possible to build a GDB that | ||
7 | can run on ARC (GNU/Linux) hosts for debugging ARC targets. | ||
8 | |||
9 | The "arc-linux-nat.c" is a rather small one that mostly deals | ||
10 | with registers and a few thread related hooks. | ||
11 | |||
12 | v2 [1]: | ||
13 | - Remove "void" from the input of "_initialize_arc_linux_nat ()" | ||
14 | |||
15 | [1] Tom's remark after the first patch | ||
16 | https://sourceware.org/pipermail/gdb-patches/2020-November/173223.html | ||
17 | |||
18 | gdb/ChangeLog: | ||
19 | |||
20 | * Makefile.in (ALLDEPFILES): Add arc-linux-nat.c. | ||
21 | * configure.host (host to gdb names): Add arc*-*-linux*. | ||
22 | * configure.nat (gdb_host_cpu): Add arc. | ||
23 | * arc-linux-nat.c: New. | ||
24 | |||
25 | Upstream-Status: Backport [https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=04c9f85efcd8df5fc482ce97c0104cc7dd5d19e6] | ||
26 | |||
27 | Signed-off-by: Anton Kolesov <Anton.Kolesov@synopsys.com> | ||
28 | Signed-off-by: Shahab Vahedi <shahab@synopsys.com> | ||
29 | Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com> | ||
30 | --- | ||
31 | gdb/Makefile.in | 1 + | ||
32 | gdb/arc-linux-nat.c | 320 ++++++++++++++++++++++++++++++++++++++++++++++++++++ | ||
33 | gdb/configure.host | 3 + | ||
34 | gdb/configure.nat | 4 + | ||
35 | 4 files changed, 328 insertions(+) | ||
36 | create mode 100644 gdb/arc-linux-nat.c | ||
37 | |||
38 | diff --git a/gdb/Makefile.in b/gdb/Makefile.in | ||
39 | index ec371fc7e52..c76136907ae 100644 | ||
40 | --- a/gdb/Makefile.in | ||
41 | +++ b/gdb/Makefile.in | ||
42 | @@ -2136,6 +2136,7 @@ ALLDEPFILES = \ | ||
43 | amd64-obsd-tdep.c \ | ||
44 | amd64-sol2-tdep.c \ | ||
45 | amd64-tdep.c \ | ||
46 | + arc-linux-nat.c \ | ||
47 | arc-tdep.c \ | ||
48 | arm.c \ | ||
49 | arm-bsd-tdep.c \ | ||
50 | diff --git a/gdb/arc-linux-nat.c b/gdb/arc-linux-nat.c | ||
51 | new file mode 100644 | ||
52 | index 00000000000..41301fd4fed | ||
53 | --- /dev/null | ||
54 | +++ b/gdb/arc-linux-nat.c | ||
55 | @@ -0,0 +1,320 @@ | ||
56 | +/* Native-dependent code for GNU/Linux ARC. | ||
57 | + | ||
58 | + Copyright 2020 Free Software Foundation, Inc. | ||
59 | + | ||
60 | + This file is part of GDB. | ||
61 | + | ||
62 | + This program is free software; you can redistribute it and/or modify | ||
63 | + it under the terms of the GNU General Public License as published by | ||
64 | + the Free Software Foundation; either version 3 of the License, or | ||
65 | + (at your option) any later version. | ||
66 | + | ||
67 | + This program is distributed in the hope that it will be useful, | ||
68 | + but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
69 | + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
70 | + GNU General Public License for more details. | ||
71 | + | ||
72 | + You should have received a copy of the GNU General Public License | ||
73 | + along with this program. If not, see <http://www.gnu.org/licenses/>. */ | ||
74 | + | ||
75 | +#include "defs.h" | ||
76 | +#include "frame.h" | ||
77 | +#include "inferior.h" | ||
78 | +#include "gdbcore.h" | ||
79 | +#include "regcache.h" | ||
80 | +#include "gdbsupport/gdb_assert.h" | ||
81 | +#include "target.h" | ||
82 | +#include "linux-nat.h" | ||
83 | +#include "nat/gdb_ptrace.h" | ||
84 | + | ||
85 | +#include <stdint.h> | ||
86 | +#include <sys/types.h> | ||
87 | +#include <sys/param.h> | ||
88 | +#include <signal.h> | ||
89 | +#include <sys/user.h> | ||
90 | +#include <sys/ioctl.h> | ||
91 | +#include "gdbsupport/gdb_wait.h" | ||
92 | +#include <fcntl.h> | ||
93 | +#include <sys/procfs.h> | ||
94 | +#include <linux/elf.h> | ||
95 | + | ||
96 | +#include "gregset.h" | ||
97 | +#include "arc-tdep.h" | ||
98 | +#include "arc-linux-tdep.h" | ||
99 | +#include "arch/arc.h" | ||
100 | + | ||
101 | +/* Defines ps_err_e, struct ps_prochandle. */ | ||
102 | +#include "gdb_proc_service.h" | ||
103 | + | ||
104 | +/* Linux starting with 4.12 supports NT_ARC_V2 note type, which adds R30, | ||
105 | + R58 and R59 registers, which are specific to ARC HS and aren't | ||
106 | + available in ARC 700. */ | ||
107 | +#if defined (NT_ARC_V2) && defined (__ARCHS__) | ||
108 | +#define ARC_HAS_V2_REGSET | ||
109 | +#endif | ||
110 | + | ||
111 | +class arc_linux_nat_target final : public linux_nat_target | ||
112 | +{ | ||
113 | +public: | ||
114 | + /* Add ARC register access methods. */ | ||
115 | + void fetch_registers (struct regcache *, int) override; | ||
116 | + void store_registers (struct regcache *, int) override; | ||
117 | + | ||
118 | + const struct target_desc *read_description () override; | ||
119 | + | ||
120 | + /* Handle threads */ | ||
121 | + void low_prepare_to_resume (struct lwp_info *lp) override; | ||
122 | +}; | ||
123 | + | ||
124 | +static arc_linux_nat_target the_arc_linux_nat_target; | ||
125 | + | ||
126 | +/* Read general registers from target process/thread (via ptrace) | ||
127 | + into REGCACHE. */ | ||
128 | + | ||
129 | +static void | ||
130 | +fetch_gregs (struct regcache *regcache, int regnum) | ||
131 | +{ | ||
132 | + const int tid = get_ptrace_pid (regcache->ptid ()); | ||
133 | + struct iovec iov; | ||
134 | + gdb_gregset_t regs; | ||
135 | + | ||
136 | + iov.iov_base = ®s; | ||
137 | + iov.iov_len = sizeof (gdb_gregset_t); | ||
138 | + | ||
139 | + if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, (void *) &iov) < 0) | ||
140 | + perror_with_name (_("Couldn't get general registers")); | ||
141 | + else | ||
142 | + arc_linux_supply_gregset (NULL, regcache, regnum, ®s, 0); | ||
143 | +} | ||
144 | + | ||
145 | +#ifdef ARC_HAS_V2_REGSET | ||
146 | +/* Read ARC v2 registers from target process/thread (via ptrace) | ||
147 | + into REGCACHE. */ | ||
148 | + | ||
149 | +static void | ||
150 | +fetch_v2_regs (struct regcache *regcache, int regnum) | ||
151 | +{ | ||
152 | + const int tid = get_ptrace_pid (regcache->ptid ()); | ||
153 | + struct iovec iov; | ||
154 | + bfd_byte v2_buffer[ARC_LINUX_SIZEOF_V2_REGSET]; | ||
155 | + | ||
156 | + iov.iov_base = &v2_buffer; | ||
157 | + iov.iov_len = ARC_LINUX_SIZEOF_V2_REGSET; | ||
158 | + | ||
159 | + if (ptrace (PTRACE_GETREGSET, tid, NT_ARC_V2, (void *) &iov) < 0) | ||
160 | + perror_with_name (_("Couldn't get ARC HS registers")); | ||
161 | + else | ||
162 | + arc_linux_supply_v2_regset (NULL, regcache, regnum, v2_buffer, 0); | ||
163 | +} | ||
164 | +#endif | ||
165 | + | ||
166 | +/* Store general registers from REGCACHE into the target process/thread. */ | ||
167 | + | ||
168 | +static void | ||
169 | +store_gregs (const struct regcache *regcache, int regnum) | ||
170 | +{ | ||
171 | + const int tid = get_ptrace_pid (regcache->ptid ()); | ||
172 | + struct iovec iov; | ||
173 | + gdb_gregset_t regs; | ||
174 | + | ||
175 | + iov.iov_base = ®s; | ||
176 | + iov.iov_len = sizeof (gdb_gregset_t); | ||
177 | + | ||
178 | + if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, (void *) &iov) < 0) | ||
179 | + perror_with_name (_("Couldn't get general registers")); | ||
180 | + else | ||
181 | + { | ||
182 | + arc_linux_collect_gregset (NULL, regcache, regnum, regs, 0); | ||
183 | + | ||
184 | + if (ptrace (PTRACE_SETREGSET, tid, NT_PRSTATUS, (void *) &iov) < 0) | ||
185 | + perror_with_name (_("Couldn't write general registers")); | ||
186 | + } | ||
187 | +} | ||
188 | + | ||
189 | +#ifdef ARC_HAS_V2_REGSET | ||
190 | +/* Store ARC v2 registers from REGCACHE into the target process/thread. */ | ||
191 | + | ||
192 | +static void | ||
193 | +store_v2_regs (const struct regcache *regcache, int regnum) | ||
194 | +{ | ||
195 | + const int tid = get_ptrace_pid (regcache->ptid ()); | ||
196 | + struct iovec iov; | ||
197 | + bfd_byte v2_buffer[ARC_LINUX_SIZEOF_V2_REGSET]; | ||
198 | + | ||
199 | + iov.iov_base = &v2_buffer; | ||
200 | + iov.iov_len = ARC_LINUX_SIZEOF_V2_REGSET; | ||
201 | + | ||
202 | + if (ptrace (PTRACE_GETREGSET, tid, NT_ARC_V2, (void *) &iov) < 0) | ||
203 | + perror_with_name (_("Couldn't get ARC HS registers")); | ||
204 | + else | ||
205 | + { | ||
206 | + arc_linux_collect_v2_regset (NULL, regcache, regnum, v2_buffer, 0); | ||
207 | + | ||
208 | + if (ptrace (PTRACE_SETREGSET, tid, NT_ARC_V2, (void *) &iov) < 0) | ||
209 | + perror_with_name (_("Couldn't write ARC HS registers")); | ||
210 | + } | ||
211 | +} | ||
212 | +#endif | ||
213 | + | ||
214 | +/* Target operation: Read REGNUM register (all registers if REGNUM == -1) | ||
215 | + from target process into REGCACHE. */ | ||
216 | + | ||
217 | +void | ||
218 | +arc_linux_nat_target::fetch_registers (struct regcache *regcache, int regnum) | ||
219 | +{ | ||
220 | + | ||
221 | + if (regnum == -1 || regnum <= ARC_LAST_REGNUM) | ||
222 | + fetch_gregs (regcache, regnum); | ||
223 | + | ||
224 | +#ifdef ARC_HAS_V2_REGSET | ||
225 | + if (regnum == -1 | ||
226 | + || regnum == ARC_R30_REGNUM | ||
227 | + || regnum == ARC_R58_REGNUM | ||
228 | + || regnum == ARC_R59_REGNUM) | ||
229 | + fetch_v2_regs (regcache, regnum); | ||
230 | +#endif | ||
231 | +} | ||
232 | + | ||
233 | +/* Target operation: Store REGNUM register (all registers if REGNUM == -1) | ||
234 | + to the target process from REGCACHE. */ | ||
235 | + | ||
236 | +void | ||
237 | +arc_linux_nat_target::store_registers (struct regcache *regcache, int regnum) | ||
238 | +{ | ||
239 | + if (regnum == -1 || regnum <= ARC_LAST_REGNUM) | ||
240 | + store_gregs (regcache, regnum); | ||
241 | + | ||
242 | +#ifdef ARC_HAS_V2_REGSET | ||
243 | + if (regnum == -1 | ||
244 | + || regnum == ARC_R30_REGNUM | ||
245 | + || regnum == ARC_R58_REGNUM | ||
246 | + || regnum == ARC_R59_REGNUM) | ||
247 | + store_v2_regs (regcache, regnum); | ||
248 | +#endif | ||
249 | +} | ||
250 | + | ||
251 | +/* Copy general purpose register(s) from REGCACHE into regset GREGS. | ||
252 | + This function is exported to proc-service.c */ | ||
253 | + | ||
254 | +void | ||
255 | +fill_gregset (const struct regcache *regcache, | ||
256 | + gdb_gregset_t *gregs, int regnum) | ||
257 | +{ | ||
258 | + arc_linux_collect_gregset (NULL, regcache, regnum, gregs, 0); | ||
259 | +} | ||
260 | + | ||
261 | +/* Copy all the general purpose registers from regset GREGS into REGCACHE. | ||
262 | + This function is exported to proc-service.c. */ | ||
263 | + | ||
264 | +void | ||
265 | +supply_gregset (struct regcache *regcache, const gdb_gregset_t *gregs) | ||
266 | +{ | ||
267 | + arc_linux_supply_gregset (NULL, regcache, -1, gregs, 0); | ||
268 | +} | ||
269 | + | ||
270 | +/* ARC doesn't have separate FP registers. This function is exported | ||
271 | + to proc-service.c. */ | ||
272 | + | ||
273 | +void | ||
274 | +fill_fpregset (const struct regcache *regcache, | ||
275 | + gdb_fpregset_t *fpregsetp, int regnum) | ||
276 | +{ | ||
277 | + if (arc_debug) | ||
278 | + debug_printf ("arc-linux-nat: fill_fpregset called."); | ||
279 | + return; | ||
280 | +} | ||
281 | + | ||
282 | +/* ARC doesn't have separate FP registers. This function is exported | ||
283 | + to proc-service.c. */ | ||
284 | + | ||
285 | +void | ||
286 | +supply_fpregset (struct regcache *regcache, const gdb_fpregset_t *fpregsetp) | ||
287 | +{ | ||
288 | + if (arc_debug) | ||
289 | + debug_printf ("arc-linux-nat: supply_fpregset called."); | ||
290 | + return; | ||
291 | +} | ||
292 | + | ||
293 | +/* Implement the "read_description" method of linux_nat_target. */ | ||
294 | + | ||
295 | +const struct target_desc * | ||
296 | +arc_linux_nat_target::read_description () | ||
297 | +{ | ||
298 | + /* This is a native target, hence description is hardcoded. */ | ||
299 | +#ifdef __ARCHS__ | ||
300 | + arc_arch_features features (4, ARC_ISA_ARCV2); | ||
301 | +#else | ||
302 | + arc_arch_features features (4, ARC_ISA_ARCV1); | ||
303 | +#endif | ||
304 | + return arc_lookup_target_description (features); | ||
305 | +} | ||
306 | + | ||
307 | +/* As described in arc_linux_collect_gregset(), we need to write resume-PC | ||
308 | + to ERET. However by default GDB for native targets doesn't write | ||
309 | + registers if they haven't been changed. This is a callback called by | ||
310 | + generic GDB, and in this callback we have to rewrite PC value so it | ||
311 | + would force rewrite of register on target. It seems that the only | ||
312 | + other arch that utilizes this hook is x86/x86-64 for HW breakpoint | ||
313 | + support. But then, AFAIK no other arch has this stop_pc/eret | ||
314 | + complexity. | ||
315 | + | ||
316 | + No better way was found, other than this fake write of register value, | ||
317 | + to force GDB into writing register to target. Is there any? */ | ||
318 | + | ||
319 | +void | ||
320 | +arc_linux_nat_target::low_prepare_to_resume (struct lwp_info *lwp) | ||
321 | +{ | ||
322 | + /* When new processes and threads are created we do not have the address | ||
323 | + space for them and calling get_thread_regcache will cause an internal | ||
324 | + error in GDB. It looks like that checking for last_resume_kind is the | ||
325 | + sensible way to determine processes for which we cannot get regcache. | ||
326 | + Ultimately, a better way would be removing the need for | ||
327 | + low_prepare_to_resume in the first place. */ | ||
328 | + if (lwp->last_resume_kind == resume_stop) | ||
329 | + return; | ||
330 | + | ||
331 | + struct regcache *regcache = get_thread_regcache (this, lwp->ptid); | ||
332 | + struct gdbarch *gdbarch = regcache->arch (); | ||
333 | + | ||
334 | + /* Read current PC value, then write it back. It is required to call | ||
335 | + invalidate(), otherwise GDB will note that new value is equal to old | ||
336 | + value and will skip write. */ | ||
337 | + ULONGEST new_pc; | ||
338 | + regcache_cooked_read_unsigned (regcache, gdbarch_pc_regnum (gdbarch), | ||
339 | + &new_pc); | ||
340 | + regcache->invalidate (gdbarch_pc_regnum (gdbarch)); | ||
341 | + regcache_cooked_write_unsigned (regcache, gdbarch_pc_regnum (gdbarch), | ||
342 | + new_pc); | ||
343 | +} | ||
344 | + | ||
345 | +/* Fetch the thread-local storage pointer for libthread_db. Note that | ||
346 | + this function is not called from GDB, but is called from libthread_db. | ||
347 | + This is required to debug multithreaded applications with NPTL. */ | ||
348 | + | ||
349 | +ps_err_e | ||
350 | +ps_get_thread_area (struct ps_prochandle *ph, lwpid_t lwpid, int idx, | ||
351 | + void **base) | ||
352 | +{ | ||
353 | + if (arc_debug >= 2) | ||
354 | + debug_printf ("arc-linux-nat: ps_get_thread_area called"); | ||
355 | + | ||
356 | + if (ptrace (PTRACE_GET_THREAD_AREA, lwpid, NULL, base) != 0) | ||
357 | + return PS_ERR; | ||
358 | + | ||
359 | + /* IDX is the bias from the thread pointer to the beginning of the | ||
360 | + thread descriptor. It has to be subtracted due to implementation | ||
361 | + quirks in libthread_db. */ | ||
362 | + *base = (void *) ((char *) *base - idx); | ||
363 | + | ||
364 | + return PS_OK; | ||
365 | +} | ||
366 | + | ||
367 | +/* Suppress warning from -Wmissing-prototypes. */ | ||
368 | +void _initialize_arc_linux_nat (); | ||
369 | +void | ||
370 | +_initialize_arc_linux_nat () | ||
371 | +{ | ||
372 | + /* Register the target. */ | ||
373 | + linux_target = &the_arc_linux_nat_target; | ||
374 | + add_inf_child_target (&the_arc_linux_nat_target); | ||
375 | +} | ||
376 | diff --git a/gdb/configure.host b/gdb/configure.host | ||
377 | index ce528237291..e94a19b0332 100644 | ||
378 | --- a/gdb/configure.host | ||
379 | +++ b/gdb/configure.host | ||
380 | @@ -60,6 +60,7 @@ case "${host_cpu}" in | ||
381 | |||
382 | aarch64*) gdb_host_cpu=aarch64 ;; | ||
383 | alpha*) gdb_host_cpu=alpha ;; | ||
384 | +arc*) gdb_host_cpu=arc ;; | ||
385 | arm*) gdb_host_cpu=arm ;; | ||
386 | hppa*) gdb_host_cpu=pa ;; | ||
387 | i[34567]86*) gdb_host_cpu=i386 ;; | ||
388 | @@ -91,6 +92,8 @@ alpha*-*-netbsd* | alpha*-*-knetbsd*-gnu) | ||
389 | gdb_host=nbsd ;; | ||
390 | alpha*-*-openbsd*) gdb_host=nbsd ;; | ||
391 | |||
392 | +arc*-*-linux*) gdb_host=linux ;; | ||
393 | + | ||
394 | arm*-*-freebsd*) gdb_host=fbsd ;; | ||
395 | arm*-*-linux*) gdb_host=linux ;; | ||
396 | arm*-*-netbsdelf* | arm*-*-knetbsd*-gnu) | ||
397 | diff --git a/gdb/configure.nat b/gdb/configure.nat | ||
398 | index bb70e303384..cd11bc86dca 100644 | ||
399 | --- a/gdb/configure.nat | ||
400 | +++ b/gdb/configure.nat | ||
401 | @@ -238,6 +238,10 @@ case ${gdb_host} in | ||
402 | nat/aarch64-linux.o \ | ||
403 | nat/aarch64-sve-linux-ptrace.o" | ||
404 | ;; | ||
405 | + arc) | ||
406 | + # Host: ARC based machine running GNU/Linux | ||
407 | + NATDEPFILES="${NATDEPFILES} arc-linux-nat.o" | ||
408 | + ;; | ||
409 | arm) | ||
410 | # Host: ARM based machine running GNU/Linux | ||
411 | NATDEPFILES="${NATDEPFILES} arm-linux-nat.o \ | ||
412 | -- | ||
413 | 2.16.2 | ||
414 | |||