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386c036b MK |
1 | /* Target-dependent code for GNU/Linux SPARC. |
2 | ||
4a94e368 | 3 | Copyright (C) 2003-2022 Free Software Foundation, Inc. |
386c036b 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 |
386c036b 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/>. */ |
386c036b MK |
19 | |
20 | #include "defs.h" | |
82ca8957 | 21 | #include "dwarf2/frame.h" |
386c036b MK |
22 | #include "frame.h" |
23 | #include "frame-unwind.h" | |
e6bb342a | 24 | #include "gdbtypes.h" |
07c5f590 | 25 | #include "regset.h" |
386c036b MK |
26 | #include "gdbarch.h" |
27 | #include "gdbcore.h" | |
28 | #include "osabi.h" | |
29 | #include "regcache.h" | |
30 | #include "solib-svr4.h" | |
31 | #include "symtab.h" | |
32 | #include "trad-frame.h" | |
70f1dc74 | 33 | #include "tramp-frame.h" |
09de9781 | 34 | #include "xml-syscall.h" |
a5ee0f0c | 35 | #include "linux-tdep.h" |
09de9781 DM |
36 | |
37 | /* The syscall's XML filename for sparc 32-bit. */ | |
38 | #define XML_SYSCALL_FILENAME_SPARC32 "syscalls/sparc-linux.xml" | |
386c036b | 39 | |
386c036b MK |
40 | #include "sparc-tdep.h" |
41 | ||
81f726ab | 42 | /* Signal trampoline support. */ |
386c036b | 43 | |
70f1dc74 | 44 | static void sparc32_linux_sigframe_init (const struct tramp_frame *self, |
bd2b40ac | 45 | frame_info_ptr this_frame, |
70f1dc74 MK |
46 | struct trad_frame_cache *this_cache, |
47 | CORE_ADDR func); | |
48 | ||
386c036b MK |
49 | /* GNU/Linux has two flavors of signals. Normal signal handlers, and |
50 | "realtime" (RT) signals. The RT signals can provide additional | |
51 | information to the signal handler if the SA_SIGINFO flag is set | |
52 | when establishing a signal handler using `sigaction'. It is not | |
53 | unlikely that future versions of GNU/Linux will support SA_SIGINFO | |
54 | for normal signals too. */ | |
55 | ||
56 | /* When the sparc Linux kernel calls a signal handler and the | |
57 | SA_RESTORER flag isn't set, the return address points to a bit of | |
70f1dc74 MK |
58 | code on the stack. This code checks whether the PC appears to be |
59 | within this bit of code. | |
386c036b | 60 | |
70f1dc74 | 61 | The instruction sequence for normal signals is encoded below. |
386c036b MK |
62 | Checking for the code sequence should be somewhat reliable, because |
63 | the effect is to call the system call sigreturn. This is unlikely | |
70f1dc74 | 64 | to occur anywhere other than a signal trampoline. */ |
386c036b | 65 | |
70f1dc74 MK |
66 | static const struct tramp_frame sparc32_linux_sigframe = |
67 | { | |
81f726ab DM |
68 | SIGTRAMP_FRAME, |
69 | 4, | |
70 | { | |
405feb71 | 71 | { 0x821020d8, ULONGEST_MAX }, /* mov __NR_sigreturn, %g1 */ |
7bc02706 TT |
72 | { 0x91d02010, ULONGEST_MAX }, /* ta 0x10 */ |
73 | { TRAMP_SENTINEL_INSN, ULONGEST_MAX } | |
81f726ab DM |
74 | }, |
75 | sparc32_linux_sigframe_init | |
76 | }; | |
386c036b | 77 | |
70f1dc74 MK |
78 | /* The instruction sequence for RT signals is slightly different. The |
79 | effect is to call the system call rt_sigreturn. */ | |
80 | ||
81 | static const struct tramp_frame sparc32_linux_rt_sigframe = | |
82 | { | |
81f726ab DM |
83 | SIGTRAMP_FRAME, |
84 | 4, | |
85 | { | |
7bc02706 TT |
86 | { 0x82102065, ULONGEST_MAX }, /* mov __NR_rt_sigreturn, %g1 */ |
87 | { 0x91d02010, ULONGEST_MAX }, /* ta 0x10 */ | |
88 | { TRAMP_SENTINEL_INSN, ULONGEST_MAX } | |
81f726ab DM |
89 | }, |
90 | sparc32_linux_sigframe_init | |
91 | }; | |
386c036b | 92 | |
eb14d406 SDJ |
93 | /* This enum represents the signals' numbers on the SPARC |
94 | architecture. It just contains the signal definitions which are | |
95 | different from the generic implementation. | |
96 | ||
97 | It is derived from the file <arch/sparc/include/uapi/asm/signal.h>, | |
98 | from the Linux kernel tree. */ | |
99 | ||
100 | enum | |
101 | { | |
102 | SPARC_LINUX_SIGEMT = 7, | |
103 | SPARC_LINUX_SIGBUS = 10, | |
104 | SPARC_LINUX_SIGSYS = 12, | |
105 | SPARC_LINUX_SIGURG = 16, | |
106 | SPARC_LINUX_SIGSTOP = 17, | |
107 | SPARC_LINUX_SIGTSTP = 18, | |
108 | SPARC_LINUX_SIGCONT = 19, | |
109 | SPARC_LINUX_SIGCHLD = 20, | |
110 | SPARC_LINUX_SIGIO = 23, | |
111 | SPARC_LINUX_SIGPOLL = SPARC_LINUX_SIGIO, | |
112 | SPARC_LINUX_SIGLOST = 29, | |
113 | SPARC_LINUX_SIGPWR = SPARC_LINUX_SIGLOST, | |
114 | SPARC_LINUX_SIGUSR1 = 30, | |
115 | SPARC_LINUX_SIGUSR2 = 31, | |
116 | }; | |
117 | ||
81f726ab DM |
118 | static void |
119 | sparc32_linux_sigframe_init (const struct tramp_frame *self, | |
bd2b40ac | 120 | frame_info_ptr this_frame, |
81f726ab DM |
121 | struct trad_frame_cache *this_cache, |
122 | CORE_ADDR func) | |
386c036b | 123 | { |
80f9e3aa | 124 | CORE_ADDR base, addr, sp_addr; |
386c036b MK |
125 | int regnum; |
126 | ||
5366653e | 127 | base = get_frame_register_unsigned (this_frame, SPARC_O1_REGNUM); |
81f726ab DM |
128 | if (self == &sparc32_linux_rt_sigframe) |
129 | base += 128; | |
386c036b | 130 | |
70f1dc74 | 131 | /* Offsets from <bits/sigcontext.h>. */ |
78a0fd57 | 132 | |
70f1dc74 MK |
133 | trad_frame_set_reg_addr (this_cache, SPARC32_PSR_REGNUM, base + 0); |
134 | trad_frame_set_reg_addr (this_cache, SPARC32_PC_REGNUM, base + 4); | |
135 | trad_frame_set_reg_addr (this_cache, SPARC32_NPC_REGNUM, base + 8); | |
136 | trad_frame_set_reg_addr (this_cache, SPARC32_Y_REGNUM, base + 12); | |
386c036b MK |
137 | |
138 | /* Since %g0 is always zero, keep the identity encoding. */ | |
70f1dc74 | 139 | addr = base + 20; |
80f9e3aa | 140 | sp_addr = base + 16 + ((SPARC_SP_REGNUM - SPARC_G0_REGNUM) * 4); |
81f726ab DM |
141 | for (regnum = SPARC_G1_REGNUM; regnum <= SPARC_O7_REGNUM; regnum++) |
142 | { | |
143 | trad_frame_set_reg_addr (this_cache, regnum, addr); | |
144 | addr += 4; | |
145 | } | |
386c036b | 146 | |
5366653e DJ |
147 | base = get_frame_register_unsigned (this_frame, SPARC_SP_REGNUM); |
148 | addr = get_frame_memory_unsigned (this_frame, sp_addr, 4); | |
80f9e3aa | 149 | |
81f726ab DM |
150 | for (regnum = SPARC_L0_REGNUM; regnum <= SPARC_I7_REGNUM; regnum++) |
151 | { | |
152 | trad_frame_set_reg_addr (this_cache, regnum, addr); | |
153 | addr += 4; | |
154 | } | |
155 | trad_frame_set_id (this_cache, frame_id_build (base, func)); | |
386c036b | 156 | } |
386c036b | 157 | \f |
0b4294d3 DM |
158 | /* Return the address of a system call's alternative return |
159 | address. */ | |
160 | ||
161 | static CORE_ADDR | |
bd2b40ac | 162 | sparc32_linux_step_trap (frame_info_ptr frame, unsigned long insn) |
0b4294d3 DM |
163 | { |
164 | if (insn == 0x91d02010) | |
165 | { | |
0b1b3e42 | 166 | ULONGEST sc_num = get_frame_register_unsigned (frame, SPARC_G1_REGNUM); |
0b4294d3 | 167 | |
c378eb4e | 168 | /* __NR_rt_sigreturn is 101 and __NR_sigreturn is 216. */ |
0b4294d3 DM |
169 | if (sc_num == 101 || sc_num == 216) |
170 | { | |
e17a4113 UW |
171 | struct gdbarch *gdbarch = get_frame_arch (frame); |
172 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); | |
173 | ||
0b4294d3 DM |
174 | ULONGEST sp, pc_offset; |
175 | ||
0b1b3e42 | 176 | sp = get_frame_register_unsigned (frame, SPARC_SP_REGNUM); |
0b4294d3 DM |
177 | |
178 | /* The kernel puts the sigreturn registers on the stack, | |
179 | and this is where the signal unwinding state is take from | |
180 | when returning from a signal. | |
181 | ||
182 | For __NR_sigreturn, this register area sits 96 bytes from | |
183 | the base of the stack. The saved PC sits 4 bytes into the | |
184 | sigreturn register save area. | |
185 | ||
186 | For __NR_rt_sigreturn a siginfo_t, which is 128 bytes, sits | |
187 | right before the sigreturn register save area. */ | |
188 | ||
189 | pc_offset = 96 + 4; | |
190 | if (sc_num == 101) | |
191 | pc_offset += 128; | |
192 | ||
e17a4113 | 193 | return read_memory_unsigned_integer (sp + pc_offset, 4, byte_order); |
0b4294d3 DM |
194 | } |
195 | } | |
196 | ||
197 | return 0; | |
198 | } | |
199 | \f | |
386c036b | 200 | |
b4fd25c9 | 201 | const struct sparc_gregmap sparc32_linux_core_gregmap = |
07c5f590 DM |
202 | { |
203 | 32 * 4, /* %psr */ | |
204 | 33 * 4, /* %pc */ | |
205 | 34 * 4, /* %npc */ | |
206 | 35 * 4, /* %y */ | |
207 | -1, /* %wim */ | |
208 | -1, /* %tbr */ | |
209 | 1 * 4, /* %g1 */ | |
210 | 16 * 4, /* %l0 */ | |
211 | 4, /* y size */ | |
212 | }; | |
213 | \f | |
214 | ||
215 | static void | |
216 | sparc32_linux_supply_core_gregset (const struct regset *regset, | |
217 | struct regcache *regcache, | |
218 | int regnum, const void *gregs, size_t len) | |
219 | { | |
b4fd25c9 | 220 | sparc32_supply_gregset (&sparc32_linux_core_gregmap, |
c378eb4e | 221 | regcache, regnum, gregs); |
07c5f590 DM |
222 | } |
223 | ||
224 | static void | |
225 | sparc32_linux_collect_core_gregset (const struct regset *regset, | |
226 | const struct regcache *regcache, | |
227 | int regnum, void *gregs, size_t len) | |
228 | { | |
b4fd25c9 | 229 | sparc32_collect_gregset (&sparc32_linux_core_gregmap, |
c378eb4e | 230 | regcache, regnum, gregs); |
07c5f590 DM |
231 | } |
232 | ||
233 | static void | |
234 | sparc32_linux_supply_core_fpregset (const struct regset *regset, | |
235 | struct regcache *regcache, | |
236 | int regnum, const void *fpregs, size_t len) | |
237 | { | |
b4fd25c9 | 238 | sparc32_supply_fpregset (&sparc32_bsd_fpregmap, regcache, regnum, fpregs); |
07c5f590 DM |
239 | } |
240 | ||
241 | static void | |
242 | sparc32_linux_collect_core_fpregset (const struct regset *regset, | |
243 | const struct regcache *regcache, | |
244 | int regnum, void *fpregs, size_t len) | |
245 | { | |
b4fd25c9 | 246 | sparc32_collect_fpregset (&sparc32_bsd_fpregmap, regcache, regnum, fpregs); |
07c5f590 DM |
247 | } |
248 | ||
e8467b5a DM |
249 | /* Set the program counter for process PTID to PC. */ |
250 | ||
251 | #define PSR_SYSCALL 0x00004000 | |
252 | ||
253 | static void | |
254 | sparc_linux_write_pc (struct regcache *regcache, CORE_ADDR pc) | |
255 | { | |
345bd07c | 256 | gdbarch *arch = regcache->arch (); |
08106042 | 257 | sparc_gdbarch_tdep *tdep = gdbarch_tdep<sparc_gdbarch_tdep> (arch); |
e8467b5a DM |
258 | ULONGEST psr; |
259 | ||
260 | regcache_cooked_write_unsigned (regcache, tdep->pc_regnum, pc); | |
261 | regcache_cooked_write_unsigned (regcache, tdep->npc_regnum, pc + 4); | |
262 | ||
263 | /* Clear the "in syscall" bit to prevent the kernel from | |
264 | messing with the PCs we just installed, if we happen to be | |
265 | within an interrupted system call that the kernel wants to | |
266 | restart. | |
267 | ||
268 | Note that after we return from the dummy call, the PSR et al. | |
269 | registers will be automatically restored, and the kernel | |
270 | continues to restart the system call at this point. */ | |
271 | regcache_cooked_read_unsigned (regcache, SPARC32_PSR_REGNUM, &psr); | |
272 | psr &= ~PSR_SYSCALL; | |
273 | regcache_cooked_write_unsigned (regcache, SPARC32_PSR_REGNUM, psr); | |
274 | } | |
275 | ||
09de9781 DM |
276 | static LONGEST |
277 | sparc32_linux_get_syscall_number (struct gdbarch *gdbarch, | |
00431a78 | 278 | thread_info *thread) |
09de9781 | 279 | { |
00431a78 | 280 | struct regcache *regcache = get_thread_regcache (thread); |
09de9781 DM |
281 | enum bfd_endian byte_order = gdbarch_byte_order (gdbarch); |
282 | /* The content of a register. */ | |
283 | gdb_byte buf[4]; | |
284 | /* The result. */ | |
285 | LONGEST ret; | |
286 | ||
287 | /* Getting the system call number from the register. | |
288 | When dealing with the sparc architecture, this information | |
289 | is stored at the %g1 register. */ | |
dca08e1f | 290 | regcache->cooked_read (SPARC_G1_REGNUM, buf); |
09de9781 DM |
291 | |
292 | ret = extract_signed_integer (buf, 4, byte_order); | |
293 | ||
294 | return ret; | |
295 | } | |
296 | ||
eb14d406 SDJ |
297 | /* Implementation of `gdbarch_gdb_signal_from_target', as defined in |
298 | gdbarch.h. */ | |
299 | ||
300 | static enum gdb_signal | |
301 | sparc32_linux_gdb_signal_from_target (struct gdbarch *gdbarch, | |
302 | int signal) | |
303 | { | |
304 | switch (signal) | |
305 | { | |
306 | case SPARC_LINUX_SIGEMT: | |
307 | return GDB_SIGNAL_EMT; | |
308 | ||
309 | case SPARC_LINUX_SIGBUS: | |
310 | return GDB_SIGNAL_BUS; | |
311 | ||
312 | case SPARC_LINUX_SIGSYS: | |
313 | return GDB_SIGNAL_SYS; | |
314 | ||
315 | case SPARC_LINUX_SIGURG: | |
316 | return GDB_SIGNAL_URG; | |
317 | ||
318 | case SPARC_LINUX_SIGSTOP: | |
319 | return GDB_SIGNAL_STOP; | |
320 | ||
321 | case SPARC_LINUX_SIGTSTP: | |
322 | return GDB_SIGNAL_TSTP; | |
323 | ||
324 | case SPARC_LINUX_SIGCONT: | |
325 | return GDB_SIGNAL_CONT; | |
326 | ||
327 | case SPARC_LINUX_SIGCHLD: | |
328 | return GDB_SIGNAL_CHLD; | |
329 | ||
330 | /* No way to differentiate between SIGIO and SIGPOLL. | |
331 | Therefore, we just handle the first one. */ | |
332 | case SPARC_LINUX_SIGIO: | |
333 | return GDB_SIGNAL_IO; | |
334 | ||
335 | /* No way to differentiate between SIGLOST and SIGPWR. | |
336 | Therefore, we just handle the first one. */ | |
337 | case SPARC_LINUX_SIGLOST: | |
338 | return GDB_SIGNAL_LOST; | |
339 | ||
340 | case SPARC_LINUX_SIGUSR1: | |
341 | return GDB_SIGNAL_USR1; | |
342 | ||
343 | case SPARC_LINUX_SIGUSR2: | |
344 | return GDB_SIGNAL_USR2; | |
345 | } | |
346 | ||
347 | return linux_gdb_signal_from_target (gdbarch, signal); | |
348 | } | |
349 | ||
350 | /* Implementation of `gdbarch_gdb_signal_to_target', as defined in | |
351 | gdbarch.h. */ | |
352 | ||
353 | static int | |
354 | sparc32_linux_gdb_signal_to_target (struct gdbarch *gdbarch, | |
355 | enum gdb_signal signal) | |
356 | { | |
357 | switch (signal) | |
358 | { | |
359 | case GDB_SIGNAL_EMT: | |
360 | return SPARC_LINUX_SIGEMT; | |
361 | ||
362 | case GDB_SIGNAL_BUS: | |
363 | return SPARC_LINUX_SIGBUS; | |
364 | ||
365 | case GDB_SIGNAL_SYS: | |
366 | return SPARC_LINUX_SIGSYS; | |
367 | ||
368 | case GDB_SIGNAL_URG: | |
369 | return SPARC_LINUX_SIGURG; | |
370 | ||
371 | case GDB_SIGNAL_STOP: | |
372 | return SPARC_LINUX_SIGSTOP; | |
373 | ||
374 | case GDB_SIGNAL_TSTP: | |
375 | return SPARC_LINUX_SIGTSTP; | |
376 | ||
377 | case GDB_SIGNAL_CONT: | |
378 | return SPARC_LINUX_SIGCONT; | |
379 | ||
380 | case GDB_SIGNAL_CHLD: | |
381 | return SPARC_LINUX_SIGCHLD; | |
382 | ||
383 | case GDB_SIGNAL_IO: | |
384 | return SPARC_LINUX_SIGIO; | |
385 | ||
386 | case GDB_SIGNAL_POLL: | |
387 | return SPARC_LINUX_SIGPOLL; | |
388 | ||
389 | case GDB_SIGNAL_LOST: | |
390 | return SPARC_LINUX_SIGLOST; | |
391 | ||
392 | case GDB_SIGNAL_PWR: | |
393 | return SPARC_LINUX_SIGPWR; | |
394 | ||
395 | case GDB_SIGNAL_USR1: | |
396 | return SPARC_LINUX_SIGUSR1; | |
397 | ||
398 | case GDB_SIGNAL_USR2: | |
399 | return SPARC_LINUX_SIGUSR2; | |
400 | } | |
401 | ||
402 | return linux_gdb_signal_to_target (gdbarch, signal); | |
403 | } | |
404 | ||
07c5f590 DM |
405 | \f |
406 | ||
b13feb94 AA |
407 | static const struct regset sparc32_linux_gregset = |
408 | { | |
409 | NULL, | |
410 | sparc32_linux_supply_core_gregset, | |
411 | sparc32_linux_collect_core_gregset | |
412 | }; | |
413 | ||
414 | static const struct regset sparc32_linux_fpregset = | |
415 | { | |
416 | NULL, | |
417 | sparc32_linux_supply_core_fpregset, | |
418 | sparc32_linux_collect_core_fpregset | |
419 | }; | |
420 | ||
386c036b MK |
421 | static void |
422 | sparc32_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch) | |
423 | { | |
08106042 | 424 | sparc_gdbarch_tdep *tdep = gdbarch_tdep<sparc_gdbarch_tdep> (gdbarch); |
a33e488c | 425 | |
480af54c | 426 | linux_init_abi (info, gdbarch, 0); |
a5ee0f0c | 427 | |
b13feb94 | 428 | tdep->gregset = &sparc32_linux_gregset; |
07c5f590 DM |
429 | tdep->sizeof_gregset = 152; |
430 | ||
b13feb94 | 431 | tdep->fpregset = &sparc32_linux_fpregset; |
07c5f590 DM |
432 | tdep->sizeof_fpregset = 396; |
433 | ||
81f726ab DM |
434 | tramp_frame_prepend_unwinder (gdbarch, &sparc32_linux_sigframe); |
435 | tramp_frame_prepend_unwinder (gdbarch, &sparc32_linux_rt_sigframe); | |
436 | ||
a33e488c MK |
437 | /* GNU/Linux has SVR4-style shared libraries... */ |
438 | set_gdbarch_skip_trampoline_code (gdbarch, find_solib_trampoline_target); | |
439 | set_solib_svr4_fetch_link_map_offsets | |
c0154a4a | 440 | (gdbarch, linux_ilp32_fetch_link_map_offsets); |
386c036b | 441 | |
a33e488c MK |
442 | /* ...which means that we need some special handling when doing |
443 | prologue analysis. */ | |
444 | tdep->plt_entry_size = 12; | |
386c036b | 445 | |
b2756930 KB |
446 | /* Enable TLS support. */ |
447 | set_gdbarch_fetch_tls_load_module_address (gdbarch, | |
dda83cd7 | 448 | svr4_fetch_objfile_link_map); |
faea95b1 | 449 | |
0b4294d3 DM |
450 | /* Make sure we can single-step over signal return system calls. */ |
451 | tdep->step_trap = sparc32_linux_step_trap; | |
452 | ||
faea95b1 | 453 | /* Hook in the DWARF CFI frame unwinder. */ |
87a7da84 | 454 | dwarf2_append_unwinders (gdbarch); |
e8467b5a DM |
455 | |
456 | set_gdbarch_write_pc (gdbarch, sparc_linux_write_pc); | |
09de9781 DM |
457 | |
458 | /* Functions for 'catch syscall'. */ | |
458c8db8 | 459 | set_xml_syscall_file_name (gdbarch, XML_SYSCALL_FILENAME_SPARC32); |
09de9781 | 460 | set_gdbarch_get_syscall_number (gdbarch, |
dda83cd7 | 461 | sparc32_linux_get_syscall_number); |
eb14d406 SDJ |
462 | |
463 | set_gdbarch_gdb_signal_from_target (gdbarch, | |
464 | sparc32_linux_gdb_signal_from_target); | |
465 | set_gdbarch_gdb_signal_to_target (gdbarch, | |
466 | sparc32_linux_gdb_signal_to_target); | |
386c036b MK |
467 | } |
468 | ||
6c265988 | 469 | void _initialize_sparc_linux_tdep (); |
386c036b | 470 | void |
6c265988 | 471 | _initialize_sparc_linux_tdep () |
386c036b MK |
472 | { |
473 | gdbarch_register_osabi (bfd_arch_sparc, 0, GDB_OSABI_LINUX, | |
474 | sparc32_linux_init_abi); | |
475 | } |