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e2879ccb MK |
1 | /* Target-dependent code for OpenBSD/amd64. |
2 | ||
42a4f53d | 3 | Copyright (C) 2003-2019 Free Software Foundation, Inc. |
e2879ccb MK |
4 | |
5 | This file is part of GDB. | |
6 | ||
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 | |
a9762ec7 | 9 | the Free Software Foundation; either version 3 of the License, or |
e2879ccb MK |
10 | (at your option) any later version. |
11 | ||
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. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
a9762ec7 | 18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
e2879ccb MK |
19 | |
20 | #include "defs.h" | |
d55e5aa6 TT |
21 | |
22 | /* Local non-gdb includes. */ | |
23 | #include "amd64-tdep.h" | |
24 | #include "bsd-uthread.h" | |
25 | #include "common/x86-xstate.h" | |
f6acec62 | 26 | #include "frame-unwind.h" |
d55e5aa6 | 27 | #include "frame.h" |
e2879ccb | 28 | #include "gdbcore.h" |
d55e5aa6 | 29 | #include "i387-tdep.h" |
911bc6ee | 30 | #include "objfiles.h" |
d55e5aa6 | 31 | #include "obsd-tdep.h" |
e2879ccb | 32 | #include "osabi.h" |
d78749b4 | 33 | #include "regcache.h" |
30b344b1 | 34 | #include "regset.h" |
d55e5aa6 TT |
35 | #include "solib-svr4.h" |
36 | #include "symtab.h" | |
e2879ccb | 37 | #include "target.h" |
f6acec62 | 38 | #include "trad-frame.h" |
e2879ccb | 39 | |
e2879ccb MK |
40 | /* Support for signal handlers. */ |
41 | ||
911bc6ee | 42 | /* Default page size. */ |
e2879ccb MK |
43 | static const int amd64obsd_page_size = 4096; |
44 | ||
10458914 DJ |
45 | /* Return whether THIS_FRAME corresponds to an OpenBSD sigtramp |
46 | routine. */ | |
911bc6ee | 47 | |
e2879ccb | 48 | static int |
10458914 | 49 | amd64obsd_sigtramp_p (struct frame_info *this_frame) |
e2879ccb | 50 | { |
10458914 | 51 | CORE_ADDR pc = get_frame_pc (this_frame); |
e2879ccb | 52 | CORE_ADDR start_pc = (pc & ~(amd64obsd_page_size - 1)); |
0dcddd84 | 53 | const gdb_byte osigreturn[] = |
e2879ccb MK |
54 | { |
55 | 0x48, 0xc7, 0xc0, | |
56 | 0x67, 0x00, 0x00, 0x00, /* movq $SYS_sigreturn, %rax */ | |
84d04465 | 57 | 0xcd, 0x80 /* int $0x80 */ |
e2879ccb | 58 | }; |
0dcddd84 MK |
59 | const gdb_byte sigreturn[] = |
60 | { | |
61 | 0x48, 0xc7, 0xc0, | |
62 | 0x67, 0x00, 0x00, 0x00, /* movq $SYS_sigreturn, %rax */ | |
63 | 0x0f, 0x05 /* syscall */ | |
64 | }; | |
1c5bf419 | 65 | size_t buflen = (sizeof sigreturn) + 1; |
d8de1ef7 | 66 | gdb_byte *buf; |
2c02bd72 | 67 | const char *name; |
911bc6ee MK |
68 | |
69 | /* If the function has a valid symbol name, it isn't a | |
70 | trampoline. */ | |
71 | find_pc_partial_function (pc, &name, NULL, NULL); | |
72 | if (name != NULL) | |
73 | return 0; | |
e2879ccb | 74 | |
911bc6ee MK |
75 | /* If the function lives in a valid section (even without a starting |
76 | point) it isn't a trampoline. */ | |
77 | if (find_pc_section (pc) != NULL) | |
e2879ccb MK |
78 | return 0; |
79 | ||
80 | /* If we can't read the instructions at START_PC, return zero. */ | |
224c3ddb | 81 | buf = (gdb_byte *) alloca ((sizeof sigreturn) + 1); |
10458914 | 82 | if (!safe_frame_unwind_memory (this_frame, start_pc + 6, buf, buflen)) |
e2879ccb MK |
83 | return 0; |
84 | ||
4cd28409 MK |
85 | /* Check for sigreturn(2). Depending on how the assembler encoded |
86 | the `movq %rsp, %rdi' instruction, the code starts at offset 6 or | |
0dcddd84 MK |
87 | 7. OpenBSD 5.0 and later use the `syscall' instruction. Older |
88 | versions use `int $0x80'. Check for both. */ | |
4cd28409 | 89 | if (memcmp (buf, sigreturn, sizeof sigreturn) |
0dcddd84 MK |
90 | && memcmp (buf + 1, sigreturn, sizeof sigreturn) |
91 | && memcmp (buf, osigreturn, sizeof osigreturn) | |
92 | && memcmp (buf + 1, osigreturn, sizeof osigreturn)) | |
e2879ccb MK |
93 | return 0; |
94 | ||
95 | return 1; | |
96 | } | |
97 | ||
10458914 DJ |
98 | /* Assuming THIS_FRAME is for a BSD sigtramp routine, return the |
99 | address of the associated sigcontext structure. */ | |
e2879ccb MK |
100 | |
101 | static CORE_ADDR | |
10458914 | 102 | amd64obsd_sigcontext_addr (struct frame_info *this_frame) |
e2879ccb | 103 | { |
10458914 | 104 | CORE_ADDR pc = get_frame_pc (this_frame); |
0fe85704 MK |
105 | ULONGEST offset = (pc & (amd64obsd_page_size - 1)); |
106 | ||
e2879ccb | 107 | /* The %rsp register points at `struct sigcontext' upon entry of a |
0fe85704 MK |
108 | signal trampoline. The relevant part of the trampoline is |
109 | ||
110 | call *%rax | |
111 | movq %rsp, %rdi | |
112 | pushq %rdi | |
113 | movq $SYS_sigreturn,%rax | |
114 | int $0x80 | |
115 | ||
116 | (see /usr/src/sys/arch/amd64/amd64/locore.S). The `pushq' | |
117 | instruction clobbers %rsp, but its value is saved in `%rdi'. */ | |
118 | ||
4cd28409 | 119 | if (offset > 5) |
10458914 | 120 | return get_frame_register_unsigned (this_frame, AMD64_RDI_REGNUM); |
0fe85704 | 121 | else |
10458914 | 122 | return get_frame_register_unsigned (this_frame, AMD64_RSP_REGNUM); |
e2879ccb MK |
123 | } |
124 | \f | |
125 | /* OpenBSD 3.5 or later. */ | |
126 | ||
127 | /* Mapping between the general-purpose registers in `struct reg' | |
128 | format and GDB's register cache layout. */ | |
129 | ||
30b344b1 | 130 | /* From <machine/reg.h>. */ |
e2879ccb MK |
131 | int amd64obsd_r_reg_offset[] = |
132 | { | |
133 | 14 * 8, /* %rax */ | |
134 | 13 * 8, /* %rbx */ | |
135 | 3 * 8, /* %rcx */ | |
136 | 2 * 8, /* %rdx */ | |
137 | 1 * 8, /* %rsi */ | |
138 | 0 * 8, /* %rdi */ | |
139 | 12 * 8, /* %rbp */ | |
140 | 15 * 8, /* %rsp */ | |
0963b4bd | 141 | 4 * 8, /* %r8 .. */ |
e2879ccb MK |
142 | 5 * 8, |
143 | 6 * 8, | |
144 | 7 * 8, | |
145 | 8 * 8, | |
146 | 9 * 8, | |
147 | 10 * 8, | |
148 | 11 * 8, /* ... %r15 */ | |
149 | 16 * 8, /* %rip */ | |
150 | 17 * 8, /* %eflags */ | |
151 | 18 * 8, /* %cs */ | |
152 | 19 * 8, /* %ss */ | |
153 | 20 * 8, /* %ds */ | |
154 | 21 * 8, /* %es */ | |
155 | 22 * 8, /* %fs */ | |
156 | 23 * 8 /* %gs */ | |
157 | }; | |
158 | ||
30b344b1 | 159 | /* From <machine/signal.h>. */ |
e2879ccb MK |
160 | static int amd64obsd_sc_reg_offset[] = |
161 | { | |
162 | 14 * 8, /* %rax */ | |
163 | 13 * 8, /* %rbx */ | |
164 | 3 * 8, /* %rcx */ | |
165 | 2 * 8, /* %rdx */ | |
166 | 1 * 8, /* %rsi */ | |
167 | 0 * 8, /* %rdi */ | |
168 | 12 * 8, /* %rbp */ | |
169 | 24 * 8, /* %rsp */ | |
0963b4bd | 170 | 4 * 8, /* %r8 ... */ |
e2879ccb MK |
171 | 5 * 8, |
172 | 6 * 8, | |
173 | 7 * 8, | |
174 | 8 * 8, | |
175 | 9 * 8, | |
176 | 10 * 8, | |
177 | 11 * 8, /* ... %r15 */ | |
178 | 21 * 8, /* %rip */ | |
179 | 23 * 8, /* %eflags */ | |
180 | 22 * 8, /* %cs */ | |
181 | 25 * 8, /* %ss */ | |
182 | 18 * 8, /* %ds */ | |
183 | 17 * 8, /* %es */ | |
184 | 16 * 8, /* %fs */ | |
185 | 15 * 8 /* %gs */ | |
186 | }; | |
187 | ||
d78749b4 MK |
188 | /* From /usr/src/lib/libpthread/arch/amd64/uthread_machdep.c. */ |
189 | static int amd64obsd_uthread_reg_offset[] = | |
190 | { | |
191 | 19 * 8, /* %rax */ | |
192 | 16 * 8, /* %rbx */ | |
193 | 18 * 8, /* %rcx */ | |
194 | 17 * 8, /* %rdx */ | |
195 | 14 * 8, /* %rsi */ | |
196 | 13 * 8, /* %rdi */ | |
197 | 15 * 8, /* %rbp */ | |
198 | -1, /* %rsp */ | |
0963b4bd | 199 | 12 * 8, /* %r8 ... */ |
d78749b4 MK |
200 | 11 * 8, |
201 | 10 * 8, | |
202 | 9 * 8, | |
203 | 8 * 8, | |
204 | 7 * 8, | |
205 | 6 * 8, | |
206 | 5 * 8, /* ... %r15 */ | |
207 | 20 * 8, /* %rip */ | |
208 | 4 * 8, /* %eflags */ | |
209 | 21 * 8, /* %cs */ | |
210 | -1, /* %ss */ | |
211 | 3 * 8, /* %ds */ | |
212 | 2 * 8, /* %es */ | |
213 | 1 * 8, /* %fs */ | |
214 | 0 * 8 /* %gs */ | |
215 | }; | |
216 | ||
217 | /* Offset within the thread structure where we can find the saved | |
218 | stack pointer (%esp). */ | |
219 | #define AMD64OBSD_UTHREAD_RSP_OFFSET 400 | |
220 | ||
221 | static void | |
222 | amd64obsd_supply_uthread (struct regcache *regcache, | |
223 | int regnum, CORE_ADDR addr) | |
224 | { | |
ac7936df | 225 | struct gdbarch *gdbarch = regcache->arch (); |
e17a4113 | 226 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
d78749b4 MK |
227 | CORE_ADDR sp_addr = addr + AMD64OBSD_UTHREAD_RSP_OFFSET; |
228 | CORE_ADDR sp = 0; | |
229 | gdb_byte buf[8]; | |
230 | int i; | |
231 | ||
232 | gdb_assert (regnum >= -1); | |
233 | ||
234 | if (regnum == -1 || regnum == AMD64_RSP_REGNUM) | |
235 | { | |
236 | int offset; | |
237 | ||
238 | /* Fetch stack pointer from thread structure. */ | |
e17a4113 | 239 | sp = read_memory_unsigned_integer (sp_addr, 8, byte_order); |
d78749b4 MK |
240 | |
241 | /* Adjust the stack pointer such that it looks as if we just | |
242 | returned from _thread_machdep_switch. */ | |
243 | offset = amd64obsd_uthread_reg_offset[AMD64_RIP_REGNUM] + 8; | |
e17a4113 | 244 | store_unsigned_integer (buf, 8, byte_order, sp + offset); |
73e1c03f | 245 | regcache->raw_supply (AMD64_RSP_REGNUM, buf); |
d78749b4 MK |
246 | } |
247 | ||
248 | for (i = 0; i < ARRAY_SIZE (amd64obsd_uthread_reg_offset); i++) | |
249 | { | |
250 | if (amd64obsd_uthread_reg_offset[i] != -1 | |
251 | && (regnum == -1 || regnum == i)) | |
252 | { | |
253 | /* Fetch stack pointer from thread structure (if we didn't | |
254 | do so already). */ | |
255 | if (sp == 0) | |
e17a4113 | 256 | sp = read_memory_unsigned_integer (sp_addr, 8, byte_order); |
d78749b4 MK |
257 | |
258 | /* Read the saved register from the stack frame. */ | |
259 | read_memory (sp + amd64obsd_uthread_reg_offset[i], buf, 8); | |
73e1c03f | 260 | regcache->raw_supply (i, buf); |
d78749b4 MK |
261 | } |
262 | } | |
263 | } | |
264 | ||
265 | static void | |
266 | amd64obsd_collect_uthread (const struct regcache *regcache, | |
267 | int regnum, CORE_ADDR addr) | |
268 | { | |
ac7936df | 269 | struct gdbarch *gdbarch = regcache->arch (); |
e17a4113 | 270 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
d78749b4 MK |
271 | CORE_ADDR sp_addr = addr + AMD64OBSD_UTHREAD_RSP_OFFSET; |
272 | CORE_ADDR sp = 0; | |
273 | gdb_byte buf[8]; | |
274 | int i; | |
275 | ||
276 | gdb_assert (regnum >= -1); | |
277 | ||
278 | if (regnum == -1 || regnum == AMD64_RSP_REGNUM) | |
279 | { | |
280 | int offset; | |
281 | ||
282 | /* Calculate the stack pointer (frame pointer) that will be | |
283 | stored into the thread structure. */ | |
284 | offset = amd64obsd_uthread_reg_offset[AMD64_RIP_REGNUM] + 8; | |
34a79281 | 285 | regcache->raw_collect (AMD64_RSP_REGNUM, buf); |
e17a4113 | 286 | sp = extract_unsigned_integer (buf, 8, byte_order) - offset; |
d78749b4 MK |
287 | |
288 | /* Store the stack pointer. */ | |
e17a4113 | 289 | write_memory_unsigned_integer (sp_addr, 8, byte_order, sp); |
d78749b4 MK |
290 | |
291 | /* The stack pointer was (potentially) modified. Make sure we | |
292 | build a proper stack frame. */ | |
293 | regnum = -1; | |
294 | } | |
295 | ||
296 | for (i = 0; i < ARRAY_SIZE (amd64obsd_uthread_reg_offset); i++) | |
297 | { | |
298 | if (amd64obsd_uthread_reg_offset[i] != -1 | |
299 | && (regnum == -1 || regnum == i)) | |
300 | { | |
301 | /* Fetch stack pointer from thread structure (if we didn't | |
302 | calculate it already). */ | |
303 | if (sp == 0) | |
e17a4113 | 304 | sp = read_memory_unsigned_integer (sp_addr, 8, byte_order); |
d78749b4 MK |
305 | |
306 | /* Write the register into the stack frame. */ | |
34a79281 | 307 | regcache->raw_collect (i, buf); |
d78749b4 MK |
308 | write_memory (sp + amd64obsd_uthread_reg_offset[i], buf, 8); |
309 | } | |
310 | } | |
311 | } | |
f6acec62 MK |
312 | /* Kernel debugging support. */ |
313 | ||
314 | /* From <machine/frame.h>. Easy since `struct trapframe' matches | |
315 | `struct sigcontext'. */ | |
316 | #define amd64obsd_tf_reg_offset amd64obsd_sc_reg_offset | |
317 | ||
318 | static struct trad_frame_cache * | |
10458914 | 319 | amd64obsd_trapframe_cache (struct frame_info *this_frame, void **this_cache) |
f6acec62 | 320 | { |
e17a4113 UW |
321 | struct gdbarch *gdbarch = get_frame_arch (this_frame); |
322 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
f6acec62 MK |
323 | struct trad_frame_cache *cache; |
324 | CORE_ADDR func, sp, addr; | |
325 | ULONGEST cs; | |
2c02bd72 | 326 | const char *name; |
f6acec62 MK |
327 | int i; |
328 | ||
329 | if (*this_cache) | |
9a3c8263 | 330 | return (struct trad_frame_cache *) *this_cache; |
f6acec62 | 331 | |
10458914 | 332 | cache = trad_frame_cache_zalloc (this_frame); |
f6acec62 MK |
333 | *this_cache = cache; |
334 | ||
10458914 DJ |
335 | func = get_frame_func (this_frame); |
336 | sp = get_frame_register_unsigned (this_frame, AMD64_RSP_REGNUM); | |
f6acec62 MK |
337 | |
338 | find_pc_partial_function (func, &name, NULL, NULL); | |
61012eef | 339 | if (name && startswith (name, "Xintr")) |
f6acec62 MK |
340 | addr = sp + 8; /* It's an interrupt frame. */ |
341 | else | |
342 | addr = sp; | |
343 | ||
344 | for (i = 0; i < ARRAY_SIZE (amd64obsd_tf_reg_offset); i++) | |
345 | if (amd64obsd_tf_reg_offset[i] != -1) | |
346 | trad_frame_set_reg_addr (cache, i, addr + amd64obsd_tf_reg_offset[i]); | |
347 | ||
348 | /* Read %cs from trap frame. */ | |
7238f002 | 349 | addr += amd64obsd_tf_reg_offset[AMD64_CS_REGNUM]; |
e17a4113 | 350 | cs = read_memory_unsigned_integer (addr, 8, byte_order); |
f6acec62 MK |
351 | if ((cs & I386_SEL_RPL) == I386_SEL_UPL) |
352 | { | |
6d566cff | 353 | /* Trap from user space; terminate backtrace. */ |
005ca36a | 354 | trad_frame_set_id (cache, outer_frame_id); |
f6acec62 MK |
355 | } |
356 | else | |
357 | { | |
358 | /* Construct the frame ID using the function start. */ | |
359 | trad_frame_set_id (cache, frame_id_build (sp + 16, func)); | |
360 | } | |
361 | ||
362 | return cache; | |
363 | } | |
364 | ||
365 | static void | |
10458914 | 366 | amd64obsd_trapframe_this_id (struct frame_info *this_frame, |
f6acec62 MK |
367 | void **this_cache, struct frame_id *this_id) |
368 | { | |
369 | struct trad_frame_cache *cache = | |
10458914 | 370 | amd64obsd_trapframe_cache (this_frame, this_cache); |
f6acec62 MK |
371 | |
372 | trad_frame_get_id (cache, this_id); | |
373 | } | |
374 | ||
10458914 DJ |
375 | static struct value * |
376 | amd64obsd_trapframe_prev_register (struct frame_info *this_frame, | |
377 | void **this_cache, int regnum) | |
f6acec62 MK |
378 | { |
379 | struct trad_frame_cache *cache = | |
10458914 | 380 | amd64obsd_trapframe_cache (this_frame, this_cache); |
f6acec62 | 381 | |
10458914 | 382 | return trad_frame_get_register (cache, this_frame, regnum); |
f6acec62 MK |
383 | } |
384 | ||
385 | static int | |
386 | amd64obsd_trapframe_sniffer (const struct frame_unwind *self, | |
10458914 | 387 | struct frame_info *this_frame, |
f6acec62 MK |
388 | void **this_prologue_cache) |
389 | { | |
390 | ULONGEST cs; | |
2c02bd72 | 391 | const char *name; |
f6acec62 | 392 | |
e5cc6d11 | 393 | /* Check Current Privilege Level and bail out if we're not executing |
6d566cff | 394 | in kernel space. */ |
10458914 | 395 | cs = get_frame_register_unsigned (this_frame, AMD64_CS_REGNUM); |
f6acec62 MK |
396 | if ((cs & I386_SEL_RPL) == I386_SEL_UPL) |
397 | return 0; | |
398 | ||
10458914 | 399 | find_pc_partial_function (get_frame_pc (this_frame), &name, NULL, NULL); |
f6acec62 MK |
400 | return (name && ((strcmp (name, "calltrap") == 0) |
401 | || (strcmp (name, "osyscall1") == 0) | |
402 | || (strcmp (name, "Xsyscall") == 0) | |
61012eef | 403 | || (startswith (name, "Xintr")))); |
f6acec62 MK |
404 | } |
405 | ||
406 | static const struct frame_unwind amd64obsd_trapframe_unwind = { | |
407 | /* FIXME: kettenis/20051219: This really is more like an interrupt | |
408 | frame, but SIGTRAMP_FRAME would print <signal handler called>, | |
409 | which really is not what we want here. */ | |
410 | NORMAL_FRAME, | |
8fbca658 | 411 | default_frame_unwind_stop_reason, |
f6acec62 MK |
412 | amd64obsd_trapframe_this_id, |
413 | amd64obsd_trapframe_prev_register, | |
414 | NULL, | |
415 | amd64obsd_trapframe_sniffer | |
416 | }; | |
417 | \f | |
d78749b4 | 418 | |
e2879ccb MK |
419 | static void |
420 | amd64obsd_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
421 | { | |
422 | struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch); | |
423 | ||
2434b019 | 424 | amd64_init_abi (info, gdbarch, |
41206e32 | 425 | amd64_target_description (X86_XSTATE_SSE_MASK, true)); |
93ffa5b9 | 426 | obsd_init_abi (info, gdbarch); |
e2879ccb | 427 | |
30b344b1 MK |
428 | /* Initialize general-purpose register set details. */ |
429 | tdep->gregset_reg_offset = amd64obsd_r_reg_offset; | |
430 | tdep->gregset_num_regs = ARRAY_SIZE (amd64obsd_r_reg_offset); | |
431 | tdep->sizeof_gregset = 24 * 8; | |
432 | ||
e2879ccb MK |
433 | tdep->jb_pc_offset = 7 * 8; |
434 | ||
911bc6ee | 435 | tdep->sigtramp_p = amd64obsd_sigtramp_p; |
e2879ccb MK |
436 | tdep->sigcontext_addr = amd64obsd_sigcontext_addr; |
437 | tdep->sc_reg_offset = amd64obsd_sc_reg_offset; | |
438 | tdep->sc_num_regs = ARRAY_SIZE (amd64obsd_sc_reg_offset); | |
7e654c37 | 439 | |
d78749b4 MK |
440 | /* OpenBSD provides a user-level threads implementation. */ |
441 | bsd_uthread_set_supply_uthread (gdbarch, amd64obsd_supply_uthread); | |
442 | bsd_uthread_set_collect_uthread (gdbarch, amd64obsd_collect_uthread); | |
443 | ||
7e654c37 MK |
444 | /* OpenBSD uses SVR4-style shared libraries. */ |
445 | set_solib_svr4_fetch_link_map_offsets | |
446 | (gdbarch, svr4_lp64_fetch_link_map_offsets); | |
f6acec62 MK |
447 | |
448 | /* Unwind kernel trap frames correctly. */ | |
449 | frame_unwind_prepend_unwinder (gdbarch, &amd64obsd_trapframe_unwind); | |
e2879ccb | 450 | } |
e2879ccb MK |
451 | |
452 | void | |
30b344b1 | 453 | _initialize_amd64obsd_tdep (void) |
e2879ccb MK |
454 | { |
455 | /* The OpenBSD/amd64 native dependent code makes this assumption. */ | |
90f90721 | 456 | gdb_assert (ARRAY_SIZE (amd64obsd_r_reg_offset) == AMD64_NUM_GREGS); |
e2879ccb MK |
457 | |
458 | gdbarch_register_osabi (bfd_arch_i386, bfd_mach_x86_64, | |
1736a7bd | 459 | GDB_OSABI_OPENBSD, amd64obsd_init_abi); |
e2879ccb | 460 | } |