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 #ifndef PTRACE_GETREGSET
44 #define PTRACE_GETREGSET 0x4204
47 #ifndef PTRACE_SETREGSET
48 #define PTRACE_SETREGSET 0x4205
51 /* Defined in auto-generated file s390-linux32.c. */
52 void init_registers_s390_linux32 (void);
53 extern const struct target_desc *tdesc_s390_linux32;
55 /* Defined in auto-generated file s390-linux32v1.c. */
56 void init_registers_s390_linux32v1 (void);
57 extern const struct target_desc *tdesc_s390_linux32v1;
59 /* Defined in auto-generated file s390-linux32v2.c. */
60 void init_registers_s390_linux32v2 (void);
61 extern const struct target_desc *tdesc_s390_linux32v2;
63 /* Defined in auto-generated file s390-linux64.c. */
64 void init_registers_s390_linux64 (void);
65 extern const struct target_desc *tdesc_s390_linux64;
67 /* Defined in auto-generated file s390-linux64v1.c. */
68 void init_registers_s390_linux64v1 (void);
69 extern const struct target_desc *tdesc_s390_linux64v1;
71 /* Defined in auto-generated file s390-linux64v2.c. */
72 void init_registers_s390_linux64v2 (void);
73 extern const struct target_desc *tdesc_s390_linux64v2;
75 /* Defined in auto-generated file s390-te-linux64.c. */
76 void init_registers_s390_te_linux64 (void);
77 extern const struct target_desc *tdesc_s390_te_linux64;
79 /* Defined in auto-generated file s390-vx-linux64.c. */
80 void init_registers_s390_vx_linux64 (void);
81 extern const struct target_desc *tdesc_s390_vx_linux64;
83 /* Defined in auto-generated file s390-tevx-linux64.c. */
84 void init_registers_s390_tevx_linux64 (void);
85 extern const struct target_desc *tdesc_s390_tevx_linux64;
87 /* Defined in auto-generated file s390x-linux64.c. */
88 void init_registers_s390x_linux64 (void);
89 extern const struct target_desc *tdesc_s390x_linux64;
91 /* Defined in auto-generated file s390x-linux64v1.c. */
92 void init_registers_s390x_linux64v1 (void);
93 extern const struct target_desc *tdesc_s390x_linux64v1;
95 /* Defined in auto-generated file s390x-linux64v2.c. */
96 void init_registers_s390x_linux64v2 (void);
97 extern const struct target_desc *tdesc_s390x_linux64v2;
99 /* Defined in auto-generated file s390x-te-linux64.c. */
100 void init_registers_s390x_te_linux64 (void);
101 extern const struct target_desc *tdesc_s390x_te_linux64;
103 /* Defined in auto-generated file s390x-vx-linux64.c. */
104 void init_registers_s390x_vx_linux64 (void);
105 extern const struct target_desc *tdesc_s390x_vx_linux64;
107 /* Defined in auto-generated file s390x-tevx-linux64.c. */
108 void init_registers_s390x_tevx_linux64 (void);
109 extern const struct target_desc *tdesc_s390x_tevx_linux64;
111 #define s390_num_regs 52
113 static int s390_regmap[] = {
114 PT_PSWMASK, PT_PSWADDR,
116 PT_GPR0, PT_GPR1, PT_GPR2, PT_GPR3,
117 PT_GPR4, PT_GPR5, PT_GPR6, PT_GPR7,
118 PT_GPR8, PT_GPR9, PT_GPR10, PT_GPR11,
119 PT_GPR12, PT_GPR13, PT_GPR14, PT_GPR15,
121 PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
122 PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
123 PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
124 PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
129 PT_FPR0_HI, PT_FPR1_HI, PT_FPR2_HI, PT_FPR3_HI,
130 PT_FPR4_HI, PT_FPR5_HI, PT_FPR6_HI, PT_FPR7_HI,
131 PT_FPR8_HI, PT_FPR9_HI, PT_FPR10_HI, PT_FPR11_HI,
132 PT_FPR12_HI, PT_FPR13_HI, PT_FPR14_HI, PT_FPR15_HI,
134 PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
135 PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
136 PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
137 PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
144 #define s390_num_regs_3264 68
146 static int s390_regmap_3264[] = {
147 PT_PSWMASK, PT_PSWADDR,
149 PT_GPR0, PT_GPR0, PT_GPR1, PT_GPR1,
150 PT_GPR2, PT_GPR2, PT_GPR3, PT_GPR3,
151 PT_GPR4, PT_GPR4, PT_GPR5, PT_GPR5,
152 PT_GPR6, PT_GPR6, PT_GPR7, PT_GPR7,
153 PT_GPR8, PT_GPR8, PT_GPR9, PT_GPR9,
154 PT_GPR10, PT_GPR10, PT_GPR11, PT_GPR11,
155 PT_GPR12, PT_GPR12, PT_GPR13, PT_GPR13,
156 PT_GPR14, PT_GPR14, PT_GPR15, PT_GPR15,
158 PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
159 PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
160 PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
161 PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
165 PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
166 PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
167 PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
168 PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
176 s390_cannot_fetch_register (int regno)
182 s390_cannot_store_register (int regno)
188 s390_collect_ptrace_register (struct regcache *regcache, int regno, char *buf)
190 int size = register_size (regcache->tdesc, regno);
191 if (size < sizeof (long))
193 const struct regs_info *regs_info = (*the_low_target.regs_info) ();
194 struct usrregs_info *usr = regs_info->usrregs;
195 int regaddr = usr->regmap[regno];
197 memset (buf, 0, sizeof (long));
199 if ((regno ^ 1) < usr->num_regs
200 && usr->regmap[regno ^ 1] == regaddr)
202 collect_register (regcache, regno & ~1, buf);
203 collect_register (regcache, (regno & ~1) + 1,
204 buf + sizeof (long) - size);
206 else if (regaddr == PT_PSWMASK)
208 /* Convert 4-byte PSW mask to 8 bytes by clearing bit 12 and copying
209 the basic addressing mode bit from the PSW address. */
210 char *addr = alloca (register_size (regcache->tdesc, regno ^ 1));
211 collect_register (regcache, regno, buf);
212 collect_register (regcache, regno ^ 1, addr);
214 buf[size] |= (addr[0] & 0x80);
216 else if (regaddr == PT_PSWADDR)
218 /* Convert 4-byte PSW address to 8 bytes by clearing the addressing
219 mode bit (which gets copied to the PSW mask instead). */
220 collect_register (regcache, regno, buf + sizeof (long) - size);
221 buf[sizeof (long) - size] &= ~0x80;
223 else if ((regaddr >= PT_GPR0 && regaddr <= PT_GPR15)
224 || regaddr == PT_ORIGGPR2)
225 collect_register (regcache, regno, buf + sizeof (long) - size);
227 collect_register (regcache, regno, buf);
230 collect_register (regcache, regno, buf);
234 s390_supply_ptrace_register (struct regcache *regcache,
235 int regno, const char *buf)
237 int size = register_size (regcache->tdesc, regno);
238 if (size < sizeof (long))
240 const struct regs_info *regs_info = (*the_low_target.regs_info) ();
241 struct usrregs_info *usr = regs_info->usrregs;
242 int regaddr = usr->regmap[regno];
244 if ((regno ^ 1) < usr->num_regs
245 && usr->regmap[regno ^ 1] == regaddr)
247 supply_register (regcache, regno & ~1, buf);
248 supply_register (regcache, (regno & ~1) + 1,
249 buf + sizeof (long) - size);
251 else if (regaddr == PT_PSWMASK)
253 /* Convert 8-byte PSW mask to 4 bytes by setting bit 12 and copying
254 the basic addressing mode into the PSW address. */
255 char *mask = alloca (size);
256 char *addr = alloca (register_size (regcache->tdesc, regno ^ 1));
257 memcpy (mask, buf, size);
259 supply_register (regcache, regno, mask);
261 collect_register (regcache, regno ^ 1, addr);
263 addr[0] |= (buf[size] & 0x80);
264 supply_register (regcache, regno ^ 1, addr);
266 else if (regaddr == PT_PSWADDR)
268 /* Convert 8-byte PSW address to 4 bytes by truncating, but
269 keeping the addressing mode bit (which was set from the mask). */
270 char *addr = alloca (size);
272 collect_register (regcache, regno, addr);
273 amode = addr[0] & 0x80;
274 memcpy (addr, buf + sizeof (long) - size, size);
277 supply_register (regcache, regno, addr);
279 else if ((regaddr >= PT_GPR0 && regaddr <= PT_GPR15)
280 || regaddr == PT_ORIGGPR2)
281 supply_register (regcache, regno, buf + sizeof (long) - size);
283 supply_register (regcache, regno, buf);
286 supply_register (regcache, regno, buf);
289 /* Provide only a fill function for the general register set. ps_lgetregs
290 will use this for NPTL support. */
293 s390_fill_gregset (struct regcache *regcache, void *buf)
296 const struct regs_info *regs_info = (*the_low_target.regs_info) ();
297 struct usrregs_info *usr = regs_info->usrregs;
299 for (i = 0; i < usr->num_regs; i++)
301 if (usr->regmap[i] < PT_PSWMASK
302 || usr->regmap[i] > PT_ACR15)
305 s390_collect_ptrace_register (regcache, i,
306 (char *) buf + usr->regmap[i]);
310 /* Fill and store functions for extended register sets. */
313 s390_store_last_break (struct regcache *regcache, const void *buf)
317 p = (const char *) buf + 8 - register_size (regcache->tdesc, 0);
318 supply_register_by_name (regcache, "last_break", p);
322 s390_fill_system_call (struct regcache *regcache, void *buf)
324 collect_register_by_name (regcache, "system_call", buf);
328 s390_store_system_call (struct regcache *regcache, const void *buf)
330 supply_register_by_name (regcache, "system_call", buf);
334 s390_store_tdb (struct regcache *regcache, const void *buf)
336 int tdb0 = find_regno (regcache->tdesc, "tdb0");
337 int tr0 = find_regno (regcache->tdesc, "tr0");
340 for (i = 0; i < 4; i++)
341 supply_register (regcache, tdb0 + i, (const char *) buf + 8 * i);
343 for (i = 0; i < 16; i++)
344 supply_register (regcache, tr0 + i, (const char *) buf + 8 * (16 + i));
348 s390_fill_vxrs_low (struct regcache *regcache, void *buf)
350 int v0 = find_regno (regcache->tdesc, "v0l");
353 for (i = 0; i < 16; i++)
354 collect_register (regcache, v0 + i, (char *) buf + 8 * i);
358 s390_store_vxrs_low (struct regcache *regcache, const void *buf)
360 int v0 = find_regno (regcache->tdesc, "v0l");
363 for (i = 0; i < 16; i++)
364 supply_register (regcache, v0 + i, (const char *) buf + 8 * i);
368 s390_fill_vxrs_high (struct regcache *regcache, void *buf)
370 int v16 = find_regno (regcache->tdesc, "v16");
373 for (i = 0; i < 16; i++)
374 collect_register (regcache, v16 + i, (char *) buf + 16 * i);
378 s390_store_vxrs_high (struct regcache *regcache, const void *buf)
380 int v16 = find_regno (regcache->tdesc, "v16");
383 for (i = 0; i < 16; i++)
384 supply_register (regcache, v16 + i, (const char *) buf + 16 * i);
387 static struct regset_info s390_regsets[] = {
388 { 0, 0, 0, 0, GENERAL_REGS, s390_fill_gregset, NULL },
389 /* Last break address is read-only; no fill function. */
390 { PTRACE_GETREGSET, -1, NT_S390_LAST_BREAK, 0, EXTENDED_REGS,
391 NULL, s390_store_last_break },
392 { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_S390_SYSTEM_CALL, 0,
393 EXTENDED_REGS, s390_fill_system_call, s390_store_system_call },
394 /* TDB is read-only. */
395 { PTRACE_GETREGSET, -1, NT_S390_TDB, 0, EXTENDED_REGS,
396 NULL, s390_store_tdb },
397 { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_S390_VXRS_LOW, 0,
398 EXTENDED_REGS, s390_fill_vxrs_low, s390_store_vxrs_low },
399 { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_S390_VXRS_HIGH, 0,
400 EXTENDED_REGS, s390_fill_vxrs_high, s390_store_vxrs_high },
401 { 0, 0, 0, -1, -1, NULL, NULL }
405 static const unsigned char s390_breakpoint[] = { 0, 1 };
406 #define s390_breakpoint_len 2
409 s390_get_pc (struct regcache *regcache)
411 if (register_size (regcache->tdesc, 0) == 4)
414 collect_register_by_name (regcache, "pswa", &pswa);
415 return pswa & 0x7fffffff;
420 collect_register_by_name (regcache, "pswa", &pc);
426 s390_set_pc (struct regcache *regcache, CORE_ADDR newpc)
428 if (register_size (regcache->tdesc, 0) == 4)
431 collect_register_by_name (regcache, "pswa", &pswa);
432 pswa = (pswa & 0x80000000) | (newpc & 0x7fffffff);
433 supply_register_by_name (regcache, "pswa", &pswa);
437 unsigned long pc = newpc;
438 supply_register_by_name (regcache, "pswa", &pc);
444 s390_get_hwcap (const struct target_desc *tdesc)
446 int wordsize = register_size (tdesc, 0);
447 unsigned char *data = alloca (2 * wordsize);
450 while ((*the_target->read_auxv) (offset, data, 2 * wordsize) == 2 * wordsize)
454 unsigned int *data_p = (unsigned int *)data;
455 if (data_p[0] == AT_HWCAP)
460 unsigned long *data_p = (unsigned long *)data;
461 if (data_p[0] == AT_HWCAP)
465 offset += 2 * wordsize;
473 s390_check_regset (int pid, int regset, int regsize)
475 gdb_byte *buf = alloca (regsize);
479 iov.iov_len = regsize;
481 if (ptrace (PTRACE_GETREGSET, pid, (long) regset, (long) &iov) >= 0
488 /* For a 31-bit inferior, whether the kernel supports using the full
490 static int have_hwcap_s390_high_gprs = 0;
494 s390_arch_setup (void)
496 const struct target_desc *tdesc;
497 struct regset_info *regset;
499 /* Check whether the kernel supports extra register sets. */
500 int pid = pid_of (current_thread);
501 int have_regset_last_break
502 = s390_check_regset (pid, NT_S390_LAST_BREAK, 8);
503 int have_regset_system_call
504 = s390_check_regset (pid, NT_S390_SYSTEM_CALL, 4);
505 int have_regset_tdb = s390_check_regset (pid, NT_S390_TDB, 256);
506 int have_regset_vxrs = s390_check_regset (pid, NT_S390_VXRS_LOW, 128)
507 && s390_check_regset (pid, NT_S390_VXRS_HIGH, 256);
509 /* Assume 31-bit inferior process. */
510 if (have_regset_system_call)
511 tdesc = tdesc_s390_linux32v2;
512 else if (have_regset_last_break)
513 tdesc = tdesc_s390_linux32v1;
515 tdesc = tdesc_s390_linux32;
517 /* On a 64-bit host, check the low bit of the (31-bit) PSWM
518 -- if this is one, we actually have a 64-bit inferior. */
522 struct regcache *regcache = new_register_cache (tdesc);
524 fetch_inferior_registers (regcache, find_regno (tdesc, "pswm"));
525 collect_register_by_name (regcache, "pswm", &pswm);
526 free_register_cache (regcache);
532 (s390_get_hwcap (tdesc_s390x_linux64v2) & HWCAP_S390_TE) != 0;
533 if (have_regset_vxrs)
535 (s390_get_hwcap (tdesc_s390x_linux64v2) & HWCAP_S390_VX) != 0;
537 if (have_regset_vxrs)
538 tdesc = (have_regset_tdb ? tdesc_s390x_tevx_linux64 :
539 tdesc_s390x_vx_linux64);
540 else if (have_regset_tdb)
541 tdesc = tdesc_s390x_te_linux64;
542 else if (have_regset_system_call)
543 tdesc = tdesc_s390x_linux64v2;
544 else if (have_regset_last_break)
545 tdesc = tdesc_s390x_linux64v1;
547 tdesc = tdesc_s390x_linux64;
550 /* For a 31-bit inferior, check whether the kernel supports
551 using the full 64-bit GPRs. */
552 else if (s390_get_hwcap (tdesc) & HWCAP_S390_HIGH_GPRS)
554 have_hwcap_s390_high_gprs = 1;
556 have_regset_tdb = (s390_get_hwcap (tdesc) & HWCAP_S390_TE) != 0;
557 if (have_regset_vxrs)
558 have_regset_vxrs = (s390_get_hwcap (tdesc) & HWCAP_S390_VX) != 0;
560 if (have_regset_vxrs)
561 tdesc = (have_regset_tdb ? tdesc_s390_tevx_linux64 :
562 tdesc_s390_vx_linux64);
563 else if (have_regset_tdb)
564 tdesc = tdesc_s390_te_linux64;
565 else if (have_regset_system_call)
566 tdesc = tdesc_s390_linux64v2;
567 else if (have_regset_last_break)
568 tdesc = tdesc_s390_linux64v1;
570 tdesc = tdesc_s390_linux64;
575 /* Update target_regsets according to available register sets. */
576 for (regset = s390_regsets; regset->size >= 0; regset++)
577 if (regset->get_request == PTRACE_GETREGSET)
578 switch (regset->nt_type)
580 case NT_S390_LAST_BREAK:
581 regset->size = have_regset_last_break? 8 : 0;
583 case NT_S390_SYSTEM_CALL:
584 regset->size = have_regset_system_call? 4 : 0;
587 regset->size = have_regset_tdb ? 256 : 0;
589 case NT_S390_VXRS_LOW:
590 regset->size = have_regset_vxrs ? 128 : 0;
592 case NT_S390_VXRS_HIGH:
593 regset->size = have_regset_vxrs ? 256 : 0;
599 current_process ()->tdesc = tdesc;
604 s390_breakpoint_at (CORE_ADDR pc)
606 unsigned char c[s390_breakpoint_len];
607 read_inferior_memory (pc, c, s390_breakpoint_len);
608 return memcmp (c, s390_breakpoint, s390_breakpoint_len) == 0;
611 static struct usrregs_info s390_usrregs_info =
617 static struct regsets_info s390_regsets_info =
619 s390_regsets, /* regsets */
621 NULL, /* disabled_regsets */
624 static struct regs_info regs_info =
626 NULL, /* regset_bitmap */
632 static struct usrregs_info s390_usrregs_info_3264 =
638 static struct regsets_info s390_regsets_info_3264 =
640 s390_regsets, /* regsets */
642 NULL, /* disabled_regsets */
645 static struct regs_info regs_info_3264 =
647 NULL, /* regset_bitmap */
648 &s390_usrregs_info_3264,
649 &s390_regsets_info_3264
653 static const struct regs_info *
654 s390_regs_info (void)
657 if (have_hwcap_s390_high_gprs)
659 const struct target_desc *tdesc = current_process ()->tdesc;
661 if (register_size (tdesc, 0) == 4)
662 return ®s_info_3264;
668 struct linux_target_ops the_low_target = {
671 s390_cannot_fetch_register,
672 s390_cannot_store_register,
673 NULL, /* fetch_register */
681 NULL, /* supports_z_point_type */
686 s390_collect_ptrace_register,
687 s390_supply_ptrace_register,
691 initialize_low_arch (void)
693 /* Initialize the Linux target descriptions. */
695 init_registers_s390_linux32 ();
696 init_registers_s390_linux32v1 ();
697 init_registers_s390_linux32v2 ();
698 init_registers_s390_linux64 ();
699 init_registers_s390_linux64v1 ();
700 init_registers_s390_linux64v2 ();
701 init_registers_s390_te_linux64 ();
702 init_registers_s390_vx_linux64 ();
703 init_registers_s390_tevx_linux64 ();
704 init_registers_s390x_linux64 ();
705 init_registers_s390x_linux64v1 ();
706 init_registers_s390x_linux64v2 ();
707 init_registers_s390x_te_linux64 ();
708 init_registers_s390x_vx_linux64 ();
709 init_registers_s390x_tevx_linux64 ();
711 initialize_regsets_info (&s390_regsets_info);
713 initialize_regsets_info (&s390_regsets_info_3264);