1 /* GNU/Linux S/390 specific low level interface, for the remote server
3 Copyright (C) 2001-2002, 2005-2012 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 /* Defined in auto-generated file s390-linux32v1.c. */
46 void init_registers_s390_linux32v1 (void);
47 /* Defined in auto-generated file s390-linux32v2.c. */
48 void init_registers_s390_linux32v2 (void);
49 /* Defined in auto-generated file s390-linux64.c. */
50 void init_registers_s390_linux64 (void);
51 /* Defined in auto-generated file s390-linux64v1.c. */
52 void init_registers_s390_linux64v1 (void);
53 /* Defined in auto-generated file s390-linux64v2.c. */
54 void init_registers_s390_linux64v2 (void);
55 /* Defined in auto-generated file s390x-linux64.c. */
56 void init_registers_s390x_linux64 (void);
57 /* Defined in auto-generated file s390x-linux64v1.c. */
58 void init_registers_s390x_linux64v1 (void);
59 /* Defined in auto-generated file s390x-linux64v2.c. */
60 void init_registers_s390x_linux64v2 (void);
62 #define s390_num_regs 52
64 static int s390_regmap[] = {
65 PT_PSWMASK, PT_PSWADDR,
67 PT_GPR0, PT_GPR1, PT_GPR2, PT_GPR3,
68 PT_GPR4, PT_GPR5, PT_GPR6, PT_GPR7,
69 PT_GPR8, PT_GPR9, PT_GPR10, PT_GPR11,
70 PT_GPR12, PT_GPR13, PT_GPR14, PT_GPR15,
72 PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
73 PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
74 PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
75 PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
80 PT_FPR0_HI, PT_FPR1_HI, PT_FPR2_HI, PT_FPR3_HI,
81 PT_FPR4_HI, PT_FPR5_HI, PT_FPR6_HI, PT_FPR7_HI,
82 PT_FPR8_HI, PT_FPR9_HI, PT_FPR10_HI, PT_FPR11_HI,
83 PT_FPR12_HI, PT_FPR13_HI, PT_FPR14_HI, PT_FPR15_HI,
85 PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
86 PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
87 PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
88 PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
95 #define s390_num_regs_3264 68
97 static int s390_regmap_3264[] = {
98 PT_PSWMASK, PT_PSWADDR,
100 PT_GPR0, PT_GPR0, PT_GPR1, PT_GPR1,
101 PT_GPR2, PT_GPR2, PT_GPR3, PT_GPR3,
102 PT_GPR4, PT_GPR4, PT_GPR5, PT_GPR5,
103 PT_GPR6, PT_GPR6, PT_GPR7, PT_GPR7,
104 PT_GPR8, PT_GPR8, PT_GPR9, PT_GPR9,
105 PT_GPR10, PT_GPR10, PT_GPR11, PT_GPR11,
106 PT_GPR12, PT_GPR12, PT_GPR13, PT_GPR13,
107 PT_GPR14, PT_GPR14, PT_GPR15, PT_GPR15,
109 PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
110 PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
111 PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
112 PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
116 PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
117 PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
118 PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
119 PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
127 s390_cannot_fetch_register (int regno)
133 s390_cannot_store_register (int regno)
139 s390_collect_ptrace_register (struct regcache *regcache, int regno, char *buf)
141 int size = register_size (regno);
142 if (size < sizeof (long))
144 int regaddr = the_low_target.regmap[regno];
146 memset (buf, 0, sizeof (long));
148 if ((regno ^ 1) < the_low_target.num_regs
149 && the_low_target.regmap[regno ^ 1] == regaddr)
151 collect_register (regcache, regno & ~1, buf);
152 collect_register (regcache, (regno & ~1) + 1,
153 buf + sizeof (long) - size);
155 else if (regaddr == PT_PSWMASK)
157 /* Convert 4-byte PSW mask to 8 bytes by clearing bit 12 and copying
158 the basic addressing mode bit from the PSW address. */
159 char *addr = alloca (register_size (regno ^ 1));
160 collect_register (regcache, regno, buf);
161 collect_register (regcache, regno ^ 1, addr);
163 buf[size] |= (addr[0] & 0x80);
165 else if (regaddr == PT_PSWADDR)
167 /* Convert 4-byte PSW address to 8 bytes by clearing the addressing
168 mode bit (which gets copied to the PSW mask instead). */
169 collect_register (regcache, regno, buf + sizeof (long) - size);
170 buf[sizeof (long) - size] &= ~0x80;
172 else if ((regaddr >= PT_GPR0 && regaddr <= PT_GPR15)
173 || regaddr == PT_ORIGGPR2)
174 collect_register (regcache, regno, buf + sizeof (long) - size);
176 collect_register (regcache, regno, buf);
179 collect_register (regcache, regno, buf);
183 s390_supply_ptrace_register (struct regcache *regcache,
184 int regno, const char *buf)
186 int size = register_size (regno);
187 if (size < sizeof (long))
189 int regaddr = the_low_target.regmap[regno];
191 if ((regno ^ 1) < the_low_target.num_regs
192 && the_low_target.regmap[regno ^ 1] == regaddr)
194 supply_register (regcache, regno & ~1, buf);
195 supply_register (regcache, (regno & ~1) + 1,
196 buf + sizeof (long) - size);
198 else if (regaddr == PT_PSWMASK)
200 /* Convert 8-byte PSW mask to 4 bytes by setting bit 12 and copying
201 the basic addressing mode into the PSW address. */
202 char *mask = alloca (size);
203 char *addr = alloca (register_size (regno ^ 1));
204 memcpy (mask, buf, size);
206 supply_register (regcache, regno, mask);
208 collect_register (regcache, regno ^ 1, addr);
210 addr[0] |= (buf[size] & 0x80);
211 supply_register (regcache, regno ^ 1, addr);
213 else if (regaddr == PT_PSWADDR)
215 /* Convert 8-byte PSW address to 4 bytes by truncating, but
216 keeping the addressing mode bit (which was set from the mask). */
217 char *addr = alloca (size);
219 collect_register (regcache, regno, addr);
220 amode = addr[0] & 0x80;
221 memcpy (addr, buf + sizeof (long) - size, size);
224 supply_register (regcache, regno, addr);
226 else if ((regaddr >= PT_GPR0 && regaddr <= PT_GPR15)
227 || regaddr == PT_ORIGGPR2)
228 supply_register (regcache, regno, buf + sizeof (long) - size);
230 supply_register (regcache, regno, buf);
233 supply_register (regcache, regno, buf);
236 /* Provide only a fill function for the general register set. ps_lgetregs
237 will use this for NPTL support. */
239 static void s390_fill_gregset (struct regcache *regcache, void *buf)
243 for (i = 0; i < the_low_target.num_regs; i++)
245 if (the_low_target.regmap[i] < PT_PSWMASK
246 || the_low_target.regmap[i] > PT_ACR15)
249 s390_collect_ptrace_register (regcache, i, (char *) buf
250 + the_low_target.regmap[i]);
254 /* Fill and store functions for extended register sets. */
257 s390_fill_last_break (struct regcache *regcache, void *buf)
259 /* Last break address is read-only. */
263 s390_store_last_break (struct regcache *regcache, const void *buf)
265 supply_register_by_name (regcache, "last_break",
266 (const char *)buf + 8 - register_size (0));
270 s390_fill_system_call (struct regcache *regcache, void *buf)
272 collect_register_by_name (regcache, "system_call", buf);
276 s390_store_system_call (struct regcache *regcache, const void *buf)
278 supply_register_by_name (regcache, "system_call", buf);
281 struct regset_info target_regsets[] = {
282 { 0, 0, 0, 0, GENERAL_REGS, s390_fill_gregset, NULL },
283 /* Last break address is read-only; do not attempt PTRACE_SETREGSET. */
284 { PTRACE_GETREGSET, PTRACE_GETREGSET, NT_S390_LAST_BREAK, 0,
285 EXTENDED_REGS, s390_fill_last_break, s390_store_last_break },
286 { PTRACE_GETREGSET, PTRACE_SETREGSET, NT_S390_SYSTEM_CALL, 0,
287 EXTENDED_REGS, s390_fill_system_call, s390_store_system_call },
288 { 0, 0, 0, -1, -1, NULL, NULL }
292 static const unsigned char s390_breakpoint[] = { 0, 1 };
293 #define s390_breakpoint_len 2
296 s390_get_pc (struct regcache *regcache)
298 if (register_size (0) == 4)
301 collect_register_by_name (regcache, "pswa", &pswa);
302 return pswa & 0x7fffffff;
307 collect_register_by_name (regcache, "pswa", &pc);
313 s390_set_pc (struct regcache *regcache, CORE_ADDR newpc)
315 if (register_size (0) == 4)
318 collect_register_by_name (regcache, "pswa", &pswa);
319 pswa = (pswa & 0x80000000) | (newpc & 0x7fffffff);
320 supply_register_by_name (regcache, "pswa", &pswa);
324 unsigned long pc = newpc;
325 supply_register_by_name (regcache, "pswa", &pc);
331 s390_get_hwcap (void)
333 int wordsize = register_size (0);
334 unsigned char *data = alloca (2 * wordsize);
337 while ((*the_target->read_auxv) (offset, data, 2 * wordsize) == 2 * wordsize)
341 unsigned int *data_p = (unsigned int *)data;
342 if (data_p[0] == AT_HWCAP)
347 unsigned long *data_p = (unsigned long *)data;
348 if (data_p[0] == AT_HWCAP)
352 offset += 2 * wordsize;
360 s390_check_regset (int pid, int regset, int regsize)
362 gdb_byte *buf = alloca (regsize);
366 iov.iov_len = regsize;
368 if (ptrace (PTRACE_GETREGSET, pid, (long) regset, (long) &iov) < 0)
375 s390_arch_setup (void)
377 struct regset_info *regset;
379 /* Check whether the kernel supports extra register sets. */
380 int pid = pid_of (get_thread_lwp (current_inferior));
381 int have_regset_last_break
382 = s390_check_regset (pid, NT_S390_LAST_BREAK, 8);
383 int have_regset_system_call
384 = s390_check_regset (pid, NT_S390_SYSTEM_CALL, 4);
386 /* Update target_regsets according to available register sets. */
387 for (regset = target_regsets; regset->fill_function != NULL; regset++)
388 if (regset->get_request == PTRACE_GETREGSET)
389 switch (regset->nt_type)
391 case NT_S390_LAST_BREAK:
392 regset->size = have_regset_last_break? 8 : 0;
394 case NT_S390_SYSTEM_CALL:
395 regset->size = have_regset_system_call? 4 : 0;
401 /* Assume 31-bit inferior process. */
402 if (have_regset_system_call)
403 init_registers_s390_linux32v2 ();
404 else if (have_regset_last_break)
405 init_registers_s390_linux32v1 ();
407 init_registers_s390_linux32 ();
409 the_low_target.num_regs = s390_num_regs;
410 the_low_target.regmap = s390_regmap;
412 /* On a 64-bit host, check the low bit of the (31-bit) PSWM
413 -- if this is one, we actually have a 64-bit inferior. */
417 struct regcache *regcache = new_register_cache ();
418 fetch_inferior_registers (regcache, find_regno ("pswm"));
419 collect_register_by_name (regcache, "pswm", &pswm);
420 free_register_cache (regcache);
424 if (have_regset_system_call)
425 init_registers_s390x_linux64v2 ();
426 else if (have_regset_last_break)
427 init_registers_s390x_linux64v1 ();
429 init_registers_s390x_linux64 ();
432 /* For a 31-bit inferior, check whether the kernel supports
433 using the full 64-bit GPRs. */
434 else if (s390_get_hwcap () & HWCAP_S390_HIGH_GPRS)
436 if (have_regset_system_call)
437 init_registers_s390_linux64v2 ();
438 else if (have_regset_last_break)
439 init_registers_s390_linux64v1 ();
441 init_registers_s390_linux64 ();
443 the_low_target.num_regs = s390_num_regs_3264;
444 the_low_target.regmap = s390_regmap_3264;
452 s390_breakpoint_at (CORE_ADDR pc)
454 unsigned char c[s390_breakpoint_len];
455 read_inferior_memory (pc, c, s390_breakpoint_len);
456 return memcmp (c, s390_breakpoint, s390_breakpoint_len) == 0;
460 struct linux_target_ops the_low_target = {
464 s390_cannot_fetch_register,
465 s390_cannot_store_register,
477 s390_collect_ptrace_register,
478 s390_supply_ptrace_register,