1 /* GNU/Linux S/390 specific low level interface, for the remote server
3 Copyright (C) 2001-2015 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
36 #define HWCAP_S390_TE 1024
40 #define HWCAP_S390_VX 2048
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 s390-te-linux64.c. */
68 void init_registers_s390_te_linux64 (void);
69 extern const struct target_desc *tdesc_s390_te_linux64;
71 /* Defined in auto-generated file s390-vx-linux64.c. */
72 void init_registers_s390_vx_linux64 (void);
73 extern const struct target_desc *tdesc_s390_vx_linux64;
75 /* Defined in auto-generated file s390-tevx-linux64.c. */
76 void init_registers_s390_tevx_linux64 (void);
77 extern const struct target_desc *tdesc_s390_tevx_linux64;
79 /* Defined in auto-generated file s390x-linux64.c. */
80 void init_registers_s390x_linux64 (void);
81 extern const struct target_desc *tdesc_s390x_linux64;
83 /* Defined in auto-generated file s390x-linux64v1.c. */
84 void init_registers_s390x_linux64v1 (void);
85 extern const struct target_desc *tdesc_s390x_linux64v1;
87 /* Defined in auto-generated file s390x-linux64v2.c. */
88 void init_registers_s390x_linux64v2 (void);
89 extern const struct target_desc *tdesc_s390x_linux64v2;
91 /* Defined in auto-generated file s390x-te-linux64.c. */
92 void init_registers_s390x_te_linux64 (void);
93 extern const struct target_desc *tdesc_s390x_te_linux64;
95 /* Defined in auto-generated file s390x-vx-linux64.c. */
96 void init_registers_s390x_vx_linux64 (void);
97 extern const struct target_desc *tdesc_s390x_vx_linux64;
99 /* Defined in auto-generated file s390x-tevx-linux64.c. */
100 void init_registers_s390x_tevx_linux64 (void);
101 extern const struct target_desc *tdesc_s390x_tevx_linux64;
103 #define s390_num_regs 52
105 static int s390_regmap[] = {
106 PT_PSWMASK, PT_PSWADDR,
108 PT_GPR0, PT_GPR1, PT_GPR2, PT_GPR3,
109 PT_GPR4, PT_GPR5, PT_GPR6, PT_GPR7,
110 PT_GPR8, PT_GPR9, PT_GPR10, PT_GPR11,
111 PT_GPR12, PT_GPR13, PT_GPR14, PT_GPR15,
113 PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
114 PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
115 PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
116 PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
121 PT_FPR0_HI, PT_FPR1_HI, PT_FPR2_HI, PT_FPR3_HI,
122 PT_FPR4_HI, PT_FPR5_HI, PT_FPR6_HI, PT_FPR7_HI,
123 PT_FPR8_HI, PT_FPR9_HI, PT_FPR10_HI, PT_FPR11_HI,
124 PT_FPR12_HI, PT_FPR13_HI, PT_FPR14_HI, PT_FPR15_HI,
126 PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
127 PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
128 PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
129 PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
136 #define s390_num_regs_3264 68
138 static int s390_regmap_3264[] = {
139 PT_PSWMASK, PT_PSWADDR,
141 PT_GPR0, PT_GPR0, PT_GPR1, PT_GPR1,
142 PT_GPR2, PT_GPR2, PT_GPR3, PT_GPR3,
143 PT_GPR4, PT_GPR4, PT_GPR5, PT_GPR5,
144 PT_GPR6, PT_GPR6, PT_GPR7, PT_GPR7,
145 PT_GPR8, PT_GPR8, PT_GPR9, PT_GPR9,
146 PT_GPR10, PT_GPR10, PT_GPR11, PT_GPR11,
147 PT_GPR12, PT_GPR12, PT_GPR13, PT_GPR13,
148 PT_GPR14, PT_GPR14, PT_GPR15, PT_GPR15,
150 PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
151 PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
152 PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
153 PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
157 PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
158 PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
159 PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
160 PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
168 s390_cannot_fetch_register (int regno)
174 s390_cannot_store_register (int regno)
180 s390_collect_ptrace_register (struct regcache *regcache, int regno, char *buf)
182 int size = register_size (regcache->tdesc, regno);
183 if (size < sizeof (long))
185 const struct regs_info *regs_info = (*the_low_target.regs_info) ();
186 struct usrregs_info *usr = regs_info->usrregs;
187 int regaddr = usr->regmap[regno];
189 memset (buf, 0, sizeof (long));
191 if ((regno ^ 1) < usr->num_regs
192 && usr->regmap[regno ^ 1] == regaddr)
194 collect_register (regcache, regno & ~1, buf);
195 collect_register (regcache, (regno & ~1) + 1,
196 buf + sizeof (long) - size);
198 else if (regaddr == PT_PSWMASK)
200 /* Convert 4-byte PSW mask to 8 bytes by clearing bit 12 and copying
201 the basic addressing mode bit from the PSW address. */
202 char *addr = alloca (register_size (regcache->tdesc, regno ^ 1));
203 collect_register (regcache, regno, buf);
204 collect_register (regcache, regno ^ 1, addr);
206 buf[size] |= (addr[0] & 0x80);
208 else if (regaddr == PT_PSWADDR)
210 /* Convert 4-byte PSW address to 8 bytes by clearing the addressing
211 mode bit (which gets copied to the PSW mask instead). */
212 collect_register (regcache, regno, buf + sizeof (long) - size);
213 buf[sizeof (long) - size] &= ~0x80;
215 else if ((regaddr >= PT_GPR0 && regaddr <= PT_GPR15)
216 || regaddr == PT_ORIGGPR2)
217 collect_register (regcache, regno, buf + sizeof (long) - size);
219 collect_register (regcache, regno, buf);
222 collect_register (regcache, regno, buf);
226 s390_supply_ptrace_register (struct regcache *regcache,
227 int regno, const char *buf)
229 int size = register_size (regcache->tdesc, regno);
230 if (size < sizeof (long))
232 const struct regs_info *regs_info = (*the_low_target.regs_info) ();
233 struct usrregs_info *usr = regs_info->usrregs;
234 int regaddr = usr->regmap[regno];
236 if ((regno ^ 1) < usr->num_regs
237 && usr->regmap[regno ^ 1] == regaddr)
239 supply_register (regcache, regno & ~1, buf);
240 supply_register (regcache, (regno & ~1) + 1,
241 buf + sizeof (long) - size);
243 else if (regaddr == PT_PSWMASK)
245 /* Convert 8-byte PSW mask to 4 bytes by setting bit 12 and copying
246 the basic addressing mode into the PSW address. */
247 char *mask = alloca (size);
248 char *addr = alloca (register_size (regcache->tdesc, regno ^ 1));
249 memcpy (mask, buf, size);
251 supply_register (regcache, regno, mask);
253 collect_register (regcache, regno ^ 1, addr);
255 addr[0] |= (buf[size] & 0x80);
256 supply_register (regcache, regno ^ 1, addr);
258 else if (regaddr == PT_PSWADDR)
260 /* Convert 8-byte PSW address to 4 bytes by truncating, but
261 keeping the addressing mode bit (which was set from the mask). */
262 char *addr = alloca (size);
264 collect_register (regcache, regno, addr);
265 amode = addr[0] & 0x80;
266 memcpy (addr, buf + sizeof (long) - size, size);
269 supply_register (regcache, regno, addr);
271 else if ((regaddr >= PT_GPR0 && regaddr <= PT_GPR15)
272 || regaddr == PT_ORIGGPR2)
273 supply_register (regcache, regno, buf + sizeof (long) - size);
275 supply_register (regcache, regno, buf);
278 supply_register (regcache, regno, buf);
281 /* Provide only a fill function for the general register set. ps_lgetregs
282 will use this for NPTL support. */
285 s390_fill_gregset (struct regcache *regcache, void *buf)
288 const struct regs_info *regs_info = (*the_low_target.regs_info) ();
289 struct usrregs_info *usr = regs_info->usrregs;
291 for (i = 0; i < usr->num_regs; i++)
293 if (usr->regmap[i] < PT_PSWMASK
294 || usr->regmap[i] > PT_ACR15)
297 s390_collect_ptrace_register (regcache, i,
298 (char *) buf + usr->regmap[i]);
302 /* Fill and store functions for extended register sets. */
305 s390_store_last_break (struct regcache *regcache, const void *buf)
309 p = (const char *) buf + 8 - register_size (regcache->tdesc, 0);
310 supply_register_by_name (regcache, "last_break", p);
314 s390_fill_system_call (struct regcache *regcache, void *buf)
316 collect_register_by_name (regcache, "system_call", buf);
320 s390_store_system_call (struct regcache *regcache, const void *buf)
322 supply_register_by_name (regcache, "system_call", buf);
326 s390_store_tdb (struct regcache *regcache, const void *buf)
328 int tdb0 = find_regno (regcache->tdesc, "tdb0");
329 int tr0 = find_regno (regcache->tdesc, "tr0");
332 for (i = 0; i < 4; i++)
333 supply_register (regcache, tdb0 + i, (const char *) buf + 8 * i);
335 for (i = 0; i < 16; i++)
336 supply_register (regcache, tr0 + i, (const char *) buf + 8 * (16 + i));
340 s390_fill_vxrs_low (struct regcache *regcache, void *buf)
342 int v0 = find_regno (regcache->tdesc, "v0l");
345 for (i = 0; i < 16; i++)
346 collect_register (regcache, v0 + i, (char *) buf + 8 * i);
350 s390_store_vxrs_low (struct regcache *regcache, const void *buf)
352 int v0 = find_regno (regcache->tdesc, "v0l");
355 for (i = 0; i < 16; i++)
356 supply_register (regcache, v0 + i, (const char *) buf + 8 * i);
360 s390_fill_vxrs_high (struct regcache *regcache, void *buf)
362 int v16 = find_regno (regcache->tdesc, "v16");
365 for (i = 0; i < 16; i++)
366 collect_register (regcache, v16 + i, (char *) buf + 16 * i);
370 s390_store_vxrs_high (struct regcache *regcache, const void *buf)
372 int v16 = find_regno (regcache->tdesc, "v16");
375 for (i = 0; i < 16; i++)
376 supply_register (regcache, v16 + i, (const char *) buf + 16 * i);
379 static struct regset_info s390_regsets[] = {
380 { 0, 0, 0, 0, GENERAL_REGS, s390_fill_gregset, NULL },
381 /* Last break address is read-only; no fill function. */
382 { PTRACE_GETREGSET, -1, NT_S390_LAST_BREAK, 0, EXTENDED_REGS,
383 NULL, s390_store_last_break },
384 { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_S390_SYSTEM_CALL, 0,
385 EXTENDED_REGS, s390_fill_system_call, s390_store_system_call },
386 /* TDB is read-only. */
387 { PTRACE_GETREGSET, -1, NT_S390_TDB, 0, EXTENDED_REGS,
388 NULL, s390_store_tdb },
389 { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_S390_VXRS_LOW, 0,
390 EXTENDED_REGS, s390_fill_vxrs_low, s390_store_vxrs_low },
391 { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_S390_VXRS_HIGH, 0,
392 EXTENDED_REGS, s390_fill_vxrs_high, s390_store_vxrs_high },
393 { 0, 0, 0, -1, -1, NULL, NULL }
397 static const unsigned char s390_breakpoint[] = { 0, 1 };
398 #define s390_breakpoint_len 2
401 s390_get_pc (struct regcache *regcache)
403 if (register_size (regcache->tdesc, 0) == 4)
406 collect_register_by_name (regcache, "pswa", &pswa);
407 return pswa & 0x7fffffff;
412 collect_register_by_name (regcache, "pswa", &pc);
418 s390_set_pc (struct regcache *regcache, CORE_ADDR newpc)
420 if (register_size (regcache->tdesc, 0) == 4)
423 collect_register_by_name (regcache, "pswa", &pswa);
424 pswa = (pswa & 0x80000000) | (newpc & 0x7fffffff);
425 supply_register_by_name (regcache, "pswa", &pswa);
429 unsigned long pc = newpc;
430 supply_register_by_name (regcache, "pswa", &pc);
436 s390_get_hwcap (const struct target_desc *tdesc)
438 int wordsize = register_size (tdesc, 0);
439 unsigned char *data = alloca (2 * wordsize);
442 while ((*the_target->read_auxv) (offset, data, 2 * wordsize) == 2 * wordsize)
446 unsigned int *data_p = (unsigned int *)data;
447 if (data_p[0] == AT_HWCAP)
452 unsigned long *data_p = (unsigned long *)data;
453 if (data_p[0] == AT_HWCAP)
457 offset += 2 * wordsize;
465 s390_check_regset (int pid, int regset, int regsize)
467 gdb_byte *buf = alloca (regsize);
471 iov.iov_len = regsize;
473 if (ptrace (PTRACE_GETREGSET, pid, (long) regset, (long) &iov) >= 0
480 /* For a 31-bit inferior, whether the kernel supports using the full
482 static int have_hwcap_s390_high_gprs = 0;
486 s390_arch_setup (void)
488 const struct target_desc *tdesc;
489 struct regset_info *regset;
491 /* Check whether the kernel supports extra register sets. */
492 int pid = pid_of (current_thread);
493 int have_regset_last_break
494 = s390_check_regset (pid, NT_S390_LAST_BREAK, 8);
495 int have_regset_system_call
496 = s390_check_regset (pid, NT_S390_SYSTEM_CALL, 4);
497 int have_regset_tdb = s390_check_regset (pid, NT_S390_TDB, 256);
498 int have_regset_vxrs = s390_check_regset (pid, NT_S390_VXRS_LOW, 128)
499 && s390_check_regset (pid, NT_S390_VXRS_HIGH, 256);
501 /* Assume 31-bit inferior process. */
502 if (have_regset_system_call)
503 tdesc = tdesc_s390_linux32v2;
504 else if (have_regset_last_break)
505 tdesc = tdesc_s390_linux32v1;
507 tdesc = tdesc_s390_linux32;
509 /* On a 64-bit host, check the low bit of the (31-bit) PSWM
510 -- if this is one, we actually have a 64-bit inferior. */
514 struct regcache *regcache = new_register_cache (tdesc);
516 fetch_inferior_registers (regcache, find_regno (tdesc, "pswm"));
517 collect_register_by_name (regcache, "pswm", &pswm);
518 free_register_cache (regcache);
524 (s390_get_hwcap (tdesc_s390x_linux64v2) & HWCAP_S390_TE) != 0;
525 if (have_regset_vxrs)
527 (s390_get_hwcap (tdesc_s390x_linux64v2) & HWCAP_S390_VX) != 0;
529 if (have_regset_vxrs)
530 tdesc = (have_regset_tdb ? tdesc_s390x_tevx_linux64 :
531 tdesc_s390x_vx_linux64);
532 else if (have_regset_tdb)
533 tdesc = tdesc_s390x_te_linux64;
534 else if (have_regset_system_call)
535 tdesc = tdesc_s390x_linux64v2;
536 else if (have_regset_last_break)
537 tdesc = tdesc_s390x_linux64v1;
539 tdesc = tdesc_s390x_linux64;
542 /* For a 31-bit inferior, check whether the kernel supports
543 using the full 64-bit GPRs. */
544 else if (s390_get_hwcap (tdesc) & HWCAP_S390_HIGH_GPRS)
546 have_hwcap_s390_high_gprs = 1;
548 have_regset_tdb = (s390_get_hwcap (tdesc) & HWCAP_S390_TE) != 0;
549 if (have_regset_vxrs)
550 have_regset_vxrs = (s390_get_hwcap (tdesc) & HWCAP_S390_VX) != 0;
552 if (have_regset_vxrs)
553 tdesc = (have_regset_tdb ? tdesc_s390_tevx_linux64 :
554 tdesc_s390_vx_linux64);
555 else if (have_regset_tdb)
556 tdesc = tdesc_s390_te_linux64;
557 else if (have_regset_system_call)
558 tdesc = tdesc_s390_linux64v2;
559 else if (have_regset_last_break)
560 tdesc = tdesc_s390_linux64v1;
562 tdesc = tdesc_s390_linux64;
567 /* Update target_regsets according to available register sets. */
568 for (regset = s390_regsets; regset->size >= 0; regset++)
569 if (regset->get_request == PTRACE_GETREGSET)
570 switch (regset->nt_type)
572 case NT_S390_LAST_BREAK:
573 regset->size = have_regset_last_break? 8 : 0;
575 case NT_S390_SYSTEM_CALL:
576 regset->size = have_regset_system_call? 4 : 0;
579 regset->size = have_regset_tdb ? 256 : 0;
581 case NT_S390_VXRS_LOW:
582 regset->size = have_regset_vxrs ? 128 : 0;
584 case NT_S390_VXRS_HIGH:
585 regset->size = have_regset_vxrs ? 256 : 0;
591 current_process ()->tdesc = tdesc;
596 s390_breakpoint_at (CORE_ADDR pc)
598 unsigned char c[s390_breakpoint_len];
599 read_inferior_memory (pc, c, s390_breakpoint_len);
600 return memcmp (c, s390_breakpoint, s390_breakpoint_len) == 0;
603 static struct usrregs_info s390_usrregs_info =
609 static struct regsets_info s390_regsets_info =
611 s390_regsets, /* regsets */
613 NULL, /* disabled_regsets */
616 static struct regs_info regs_info =
618 NULL, /* regset_bitmap */
624 static struct usrregs_info s390_usrregs_info_3264 =
630 static struct regsets_info s390_regsets_info_3264 =
632 s390_regsets, /* regsets */
634 NULL, /* disabled_regsets */
637 static struct regs_info regs_info_3264 =
639 NULL, /* regset_bitmap */
640 &s390_usrregs_info_3264,
641 &s390_regsets_info_3264
645 static const struct regs_info *
646 s390_regs_info (void)
649 if (have_hwcap_s390_high_gprs)
651 const struct target_desc *tdesc = current_process ()->tdesc;
653 if (register_size (tdesc, 0) == 4)
654 return ®s_info_3264;
660 struct linux_target_ops the_low_target = {
663 s390_cannot_fetch_register,
664 s390_cannot_store_register,
665 NULL, /* fetch_register */
673 NULL, /* supports_z_point_type */
678 s390_collect_ptrace_register,
679 s390_supply_ptrace_register,
683 initialize_low_arch (void)
685 /* Initialize the Linux target descriptions. */
687 init_registers_s390_linux32 ();
688 init_registers_s390_linux32v1 ();
689 init_registers_s390_linux32v2 ();
690 init_registers_s390_linux64 ();
691 init_registers_s390_linux64v1 ();
692 init_registers_s390_linux64v2 ();
693 init_registers_s390_te_linux64 ();
694 init_registers_s390_vx_linux64 ();
695 init_registers_s390_tevx_linux64 ();
696 init_registers_s390x_linux64 ();
697 init_registers_s390x_linux64v1 ();
698 init_registers_s390x_linux64v2 ();
699 init_registers_s390x_te_linux64 ();
700 init_registers_s390x_vx_linux64 ();
701 init_registers_s390x_tevx_linux64 ();
703 initialize_regsets_info (&s390_regsets_info);
705 initialize_regsets_info (&s390_regsets_info_3264);