1 /* GNU/Linux S/390 specific low level interface, for the remote server
3 Copyright (C) 2001-2013 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/>. */
20 /* This file is used for both 31-bit and 64-bit S/390 systems. */
23 #include "linux-low.h"
24 #include "elf/common.h"
26 #include <asm/ptrace.h>
27 #include <sys/ptrace.h>
31 #ifndef HWCAP_S390_HIGH_GPRS
32 #define HWCAP_S390_HIGH_GPRS 512
35 #ifndef PTRACE_GETREGSET
36 #define PTRACE_GETREGSET 0x4204
39 #ifndef PTRACE_SETREGSET
40 #define PTRACE_SETREGSET 0x4205
43 /* Defined in auto-generated file s390-linux32.c. */
44 void init_registers_s390_linux32 (void);
45 extern const struct target_desc *tdesc_s390_linux32;
47 /* Defined in auto-generated file s390-linux32v1.c. */
48 void init_registers_s390_linux32v1 (void);
49 extern const struct target_desc *tdesc_s390_linux32v1;
51 /* Defined in auto-generated file s390-linux32v2.c. */
52 void init_registers_s390_linux32v2 (void);
53 extern const struct target_desc *tdesc_s390_linux32v2;
55 /* Defined in auto-generated file s390-linux64.c. */
56 void init_registers_s390_linux64 (void);
57 extern const struct target_desc *tdesc_s390_linux64;
59 /* Defined in auto-generated file s390-linux64v1.c. */
60 void init_registers_s390_linux64v1 (void);
61 extern const struct target_desc *tdesc_s390_linux64v1;
63 /* Defined in auto-generated file s390-linux64v2.c. */
64 void init_registers_s390_linux64v2 (void);
65 extern const struct target_desc *tdesc_s390_linux64v2;
67 /* Defined in auto-generated file s390x-linux64.c. */
68 void init_registers_s390x_linux64 (void);
69 extern const struct target_desc *tdesc_s390x_linux64;
71 /* Defined in auto-generated file s390x-linux64v1.c. */
72 void init_registers_s390x_linux64v1 (void);
73 extern const struct target_desc *tdesc_s390x_linux64v1;
75 /* Defined in auto-generated file s390x-linux64v2.c. */
76 void init_registers_s390x_linux64v2 (void);
77 extern const struct target_desc *tdesc_s390x_linux64v2;
79 #define s390_num_regs 52
81 static int s390_regmap[] = {
82 PT_PSWMASK, PT_PSWADDR,
84 PT_GPR0, PT_GPR1, PT_GPR2, PT_GPR3,
85 PT_GPR4, PT_GPR5, PT_GPR6, PT_GPR7,
86 PT_GPR8, PT_GPR9, PT_GPR10, PT_GPR11,
87 PT_GPR12, PT_GPR13, PT_GPR14, PT_GPR15,
89 PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
90 PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
91 PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
92 PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
97 PT_FPR0_HI, PT_FPR1_HI, PT_FPR2_HI, PT_FPR3_HI,
98 PT_FPR4_HI, PT_FPR5_HI, PT_FPR6_HI, PT_FPR7_HI,
99 PT_FPR8_HI, PT_FPR9_HI, PT_FPR10_HI, PT_FPR11_HI,
100 PT_FPR12_HI, PT_FPR13_HI, PT_FPR14_HI, PT_FPR15_HI,
102 PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
103 PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
104 PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
105 PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
112 #define s390_num_regs_3264 68
114 static int s390_regmap_3264[] = {
115 PT_PSWMASK, PT_PSWADDR,
117 PT_GPR0, PT_GPR0, PT_GPR1, PT_GPR1,
118 PT_GPR2, PT_GPR2, PT_GPR3, PT_GPR3,
119 PT_GPR4, PT_GPR4, PT_GPR5, PT_GPR5,
120 PT_GPR6, PT_GPR6, PT_GPR7, PT_GPR7,
121 PT_GPR8, PT_GPR8, PT_GPR9, PT_GPR9,
122 PT_GPR10, PT_GPR10, PT_GPR11, PT_GPR11,
123 PT_GPR12, PT_GPR12, PT_GPR13, PT_GPR13,
124 PT_GPR14, PT_GPR14, PT_GPR15, PT_GPR15,
126 PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
127 PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
128 PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
129 PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
133 PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
134 PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
135 PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
136 PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
144 s390_cannot_fetch_register (int regno)
150 s390_cannot_store_register (int regno)
156 s390_collect_ptrace_register (struct regcache *regcache, int regno, char *buf)
158 int size = register_size (regcache->tdesc, regno);
159 if (size < sizeof (long))
161 const struct regs_info *regs_info = (*the_low_target.regs_info) ();
162 struct usrregs_info *usr = regs_info->usrregs;
163 int regaddr = usr->regmap[regno];
165 memset (buf, 0, sizeof (long));
167 if ((regno ^ 1) < usr->num_regs
168 && usr->regmap[regno ^ 1] == regaddr)
170 collect_register (regcache, regno & ~1, buf);
171 collect_register (regcache, (regno & ~1) + 1,
172 buf + sizeof (long) - size);
174 else if (regaddr == PT_PSWMASK)
176 /* Convert 4-byte PSW mask to 8 bytes by clearing bit 12 and copying
177 the basic addressing mode bit from the PSW address. */
178 char *addr = alloca (register_size (regcache->tdesc, regno ^ 1));
179 collect_register (regcache, regno, buf);
180 collect_register (regcache, regno ^ 1, addr);
182 buf[size] |= (addr[0] & 0x80);
184 else if (regaddr == PT_PSWADDR)
186 /* Convert 4-byte PSW address to 8 bytes by clearing the addressing
187 mode bit (which gets copied to the PSW mask instead). */
188 collect_register (regcache, regno, buf + sizeof (long) - size);
189 buf[sizeof (long) - size] &= ~0x80;
191 else if ((regaddr >= PT_GPR0 && regaddr <= PT_GPR15)
192 || regaddr == PT_ORIGGPR2)
193 collect_register (regcache, regno, buf + sizeof (long) - size);
195 collect_register (regcache, regno, buf);
198 collect_register (regcache, regno, buf);
202 s390_supply_ptrace_register (struct regcache *regcache,
203 int regno, const char *buf)
205 int size = register_size (regcache->tdesc, regno);
206 if (size < sizeof (long))
208 const struct regs_info *regs_info = (*the_low_target.regs_info) ();
209 struct usrregs_info *usr = regs_info->usrregs;
210 int regaddr = usr->regmap[regno];
212 if ((regno ^ 1) < usr->num_regs
213 && usr->regmap[regno ^ 1] == regaddr)
215 supply_register (regcache, regno & ~1, buf);
216 supply_register (regcache, (regno & ~1) + 1,
217 buf + sizeof (long) - size);
219 else if (regaddr == PT_PSWMASK)
221 /* Convert 8-byte PSW mask to 4 bytes by setting bit 12 and copying
222 the basic addressing mode into the PSW address. */
223 char *mask = alloca (size);
224 char *addr = alloca (register_size (regcache->tdesc, regno ^ 1));
225 memcpy (mask, buf, size);
227 supply_register (regcache, regno, mask);
229 collect_register (regcache, regno ^ 1, addr);
231 addr[0] |= (buf[size] & 0x80);
232 supply_register (regcache, regno ^ 1, addr);
234 else if (regaddr == PT_PSWADDR)
236 /* Convert 8-byte PSW address to 4 bytes by truncating, but
237 keeping the addressing mode bit (which was set from the mask). */
238 char *addr = alloca (size);
240 collect_register (regcache, regno, addr);
241 amode = addr[0] & 0x80;
242 memcpy (addr, buf + sizeof (long) - size, size);
245 supply_register (regcache, regno, addr);
247 else if ((regaddr >= PT_GPR0 && regaddr <= PT_GPR15)
248 || regaddr == PT_ORIGGPR2)
249 supply_register (regcache, regno, buf + sizeof (long) - size);
251 supply_register (regcache, regno, buf);
254 supply_register (regcache, regno, buf);
257 /* Provide only a fill function for the general register set. ps_lgetregs
258 will use this for NPTL support. */
261 s390_fill_gregset (struct regcache *regcache, void *buf)
264 const struct regs_info *regs_info = (*the_low_target.regs_info) ();
265 struct usrregs_info *usr = regs_info->usrregs;
267 for (i = 0; i < usr->num_regs; i++)
269 if (usr->regmap[i] < PT_PSWMASK
270 || usr->regmap[i] > PT_ACR15)
273 s390_collect_ptrace_register (regcache, i,
274 (char *) buf + usr->regmap[i]);
278 /* Fill and store functions for extended register sets. */
281 s390_fill_last_break (struct regcache *regcache, void *buf)
283 /* Last break address is read-only. */
287 s390_store_last_break (struct regcache *regcache, const void *buf)
291 p = (const char *) buf + 8 - register_size (regcache->tdesc, 0);
292 supply_register_by_name (regcache, "last_break", p);
296 s390_fill_system_call (struct regcache *regcache, void *buf)
298 collect_register_by_name (regcache, "system_call", buf);
302 s390_store_system_call (struct regcache *regcache, const void *buf)
304 supply_register_by_name (regcache, "system_call", buf);
307 static struct regset_info s390_regsets[] = {
308 { 0, 0, 0, 0, GENERAL_REGS, s390_fill_gregset, NULL },
309 /* Last break address is read-only; do not attempt PTRACE_SETREGSET. */
310 { PTRACE_GETREGSET, PTRACE_GETREGSET, NT_S390_LAST_BREAK, 0,
311 EXTENDED_REGS, s390_fill_last_break, s390_store_last_break },
312 { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_S390_SYSTEM_CALL, 0,
313 EXTENDED_REGS, s390_fill_system_call, s390_store_system_call },
314 { 0, 0, 0, -1, -1, NULL, NULL }
318 static const unsigned char s390_breakpoint[] = { 0, 1 };
319 #define s390_breakpoint_len 2
322 s390_get_pc (struct regcache *regcache)
324 if (register_size (regcache->tdesc, 0) == 4)
327 collect_register_by_name (regcache, "pswa", &pswa);
328 return pswa & 0x7fffffff;
333 collect_register_by_name (regcache, "pswa", &pc);
339 s390_set_pc (struct regcache *regcache, CORE_ADDR newpc)
341 if (register_size (regcache->tdesc, 0) == 4)
344 collect_register_by_name (regcache, "pswa", &pswa);
345 pswa = (pswa & 0x80000000) | (newpc & 0x7fffffff);
346 supply_register_by_name (regcache, "pswa", &pswa);
350 unsigned long pc = newpc;
351 supply_register_by_name (regcache, "pswa", &pc);
357 s390_get_hwcap (const struct target_desc *tdesc)
359 int wordsize = register_size (tdesc, 0);
360 unsigned char *data = alloca (2 * wordsize);
363 while ((*the_target->read_auxv) (offset, data, 2 * wordsize) == 2 * wordsize)
367 unsigned int *data_p = (unsigned int *)data;
368 if (data_p[0] == AT_HWCAP)
373 unsigned long *data_p = (unsigned long *)data;
374 if (data_p[0] == AT_HWCAP)
378 offset += 2 * wordsize;
386 s390_check_regset (int pid, int regset, int regsize)
388 gdb_byte *buf = alloca (regsize);
392 iov.iov_len = regsize;
394 if (ptrace (PTRACE_GETREGSET, pid, (long) regset, (long) &iov) < 0)
401 /* For a 31-bit inferior, whether the kernel supports using the full
403 static int have_hwcap_s390_high_gprs = 0;
407 s390_arch_setup (void)
409 const struct target_desc *tdesc;
410 struct regset_info *regset;
412 /* Check whether the kernel supports extra register sets. */
413 int pid = pid_of (get_thread_lwp (current_inferior));
414 int have_regset_last_break
415 = s390_check_regset (pid, NT_S390_LAST_BREAK, 8);
416 int have_regset_system_call
417 = s390_check_regset (pid, NT_S390_SYSTEM_CALL, 4);
419 /* Update target_regsets according to available register sets. */
420 for (regset = s390_regsets; regset->fill_function != NULL; regset++)
421 if (regset->get_request == PTRACE_GETREGSET)
422 switch (regset->nt_type)
424 case NT_S390_LAST_BREAK:
425 regset->size = have_regset_last_break? 8 : 0;
427 case NT_S390_SYSTEM_CALL:
428 regset->size = have_regset_system_call? 4 : 0;
434 /* Assume 31-bit inferior process. */
435 if (have_regset_system_call)
436 tdesc = tdesc_s390_linux32v2;
437 else if (have_regset_last_break)
438 tdesc = tdesc_s390_linux32v1;
440 tdesc = tdesc_s390_linux32;
442 /* On a 64-bit host, check the low bit of the (31-bit) PSWM
443 -- if this is one, we actually have a 64-bit inferior. */
447 struct regcache *regcache = new_register_cache (tdesc);
448 fetch_inferior_registers (regcache, find_regno (tdesc, "pswm"));
449 collect_register_by_name (regcache, "pswm", &pswm);
450 free_register_cache (regcache);
454 if (have_regset_system_call)
455 tdesc = tdesc_s390x_linux64v2;
456 else if (have_regset_last_break)
457 tdesc = tdesc_s390x_linux64v1;
459 tdesc = tdesc_s390x_linux64;
462 /* For a 31-bit inferior, check whether the kernel supports
463 using the full 64-bit GPRs. */
464 else if (s390_get_hwcap (tdesc) & HWCAP_S390_HIGH_GPRS)
466 have_hwcap_s390_high_gprs = 1;
468 if (have_regset_system_call)
469 tdesc = tdesc_s390_linux64v2;
470 else if (have_regset_last_break)
471 tdesc = tdesc_s390_linux64v1;
473 tdesc = tdesc_s390_linux64;
477 current_process ()->tdesc = tdesc;
482 s390_breakpoint_at (CORE_ADDR pc)
484 unsigned char c[s390_breakpoint_len];
485 read_inferior_memory (pc, c, s390_breakpoint_len);
486 return memcmp (c, s390_breakpoint, s390_breakpoint_len) == 0;
489 static struct usrregs_info s390_usrregs_info =
495 static struct regsets_info s390_regsets_info =
497 s390_regsets, /* regsets */
499 NULL, /* disabled_regsets */
502 static struct regs_info regs_info =
504 NULL, /* regset_bitmap */
510 static struct usrregs_info s390_usrregs_info_3264 =
516 static struct regsets_info s390_regsets_info_3264 =
518 s390_regsets, /* regsets */
520 NULL, /* disabled_regsets */
523 static struct regs_info regs_info_3264 =
525 NULL, /* regset_bitmap */
526 &s390_usrregs_info_3264,
527 &s390_regsets_info_3264
531 static const struct regs_info *
532 s390_regs_info (void)
535 if (have_hwcap_s390_high_gprs)
537 const struct target_desc *tdesc = current_process ()->tdesc;
539 if (register_size (tdesc, 0) == 4)
540 return ®s_info_3264;
546 struct linux_target_ops the_low_target = {
549 s390_cannot_fetch_register,
550 s390_cannot_store_register,
551 NULL, /* fetch_register */
563 s390_collect_ptrace_register,
564 s390_supply_ptrace_register,
568 initialize_low_arch (void)
570 /* Initialize the Linux target descriptions. */
572 init_registers_s390_linux32 ();
573 init_registers_s390_linux32v1 ();
574 init_registers_s390_linux32v2 ();
575 init_registers_s390_linux64 ();
576 init_registers_s390_linux64v1 ();
577 init_registers_s390_linux64v2 ();
578 init_registers_s390x_linux64 ();
579 init_registers_s390x_linux64v1 ();
580 init_registers_s390x_linux64v2 ();
582 initialize_regsets_info (&s390_regsets_info);
584 initialize_regsets_info (&s390_regsets_info_3264);