1 /* GNU/Linux S/390 specific low level interface, for the remote server
3 Copyright (C) 2001, 2002, 2005, 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
21 /* This file is used for both 31-bit and 64-bit S/390 systems. */
24 #include "linux-low.h"
26 #include <asm/ptrace.h>
29 #ifndef HWCAP_S390_HIGH_GPRS
30 #define HWCAP_S390_HIGH_GPRS 512
33 /* Defined in auto-generated file s390-linux32.c. */
34 void init_registers_s390_linux32 (void);
35 /* Defined in auto-generated file s390-linux64.c. */
36 void init_registers_s390_linux64 (void);
37 /* Defined in auto-generated file s390x-linux64.c. */
38 void init_registers_s390x_linux64 (void);
40 #define s390_num_regs 51
42 static int s390_regmap[] = {
43 PT_PSWMASK, PT_PSWADDR,
45 PT_GPR0, PT_GPR1, PT_GPR2, PT_GPR3,
46 PT_GPR4, PT_GPR5, PT_GPR6, PT_GPR7,
47 PT_GPR8, PT_GPR9, PT_GPR10, PT_GPR11,
48 PT_GPR12, PT_GPR13, PT_GPR14, PT_GPR15,
50 PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
51 PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
52 PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
53 PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
58 PT_FPR0_HI, PT_FPR1_HI, PT_FPR2_HI, PT_FPR3_HI,
59 PT_FPR4_HI, PT_FPR5_HI, PT_FPR6_HI, PT_FPR7_HI,
60 PT_FPR8_HI, PT_FPR9_HI, PT_FPR10_HI, PT_FPR11_HI,
61 PT_FPR12_HI, PT_FPR13_HI, PT_FPR14_HI, PT_FPR15_HI,
63 PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
64 PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
65 PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
66 PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
71 #define s390_num_regs_3264 67
73 static int s390_regmap_3264[] = {
74 PT_PSWMASK, PT_PSWADDR,
76 PT_GPR0, PT_GPR0, PT_GPR1, PT_GPR1,
77 PT_GPR2, PT_GPR2, PT_GPR3, PT_GPR3,
78 PT_GPR4, PT_GPR4, PT_GPR5, PT_GPR5,
79 PT_GPR6, PT_GPR6, PT_GPR7, PT_GPR7,
80 PT_GPR8, PT_GPR8, PT_GPR9, PT_GPR9,
81 PT_GPR10, PT_GPR10, PT_GPR11, PT_GPR11,
82 PT_GPR12, PT_GPR12, PT_GPR13, PT_GPR13,
83 PT_GPR14, PT_GPR14, PT_GPR15, PT_GPR15,
85 PT_ACR0, PT_ACR1, PT_ACR2, PT_ACR3,
86 PT_ACR4, PT_ACR5, PT_ACR6, PT_ACR7,
87 PT_ACR8, PT_ACR9, PT_ACR10, PT_ACR11,
88 PT_ACR12, PT_ACR13, PT_ACR14, PT_ACR15,
92 PT_FPR0, PT_FPR1, PT_FPR2, PT_FPR3,
93 PT_FPR4, PT_FPR5, PT_FPR6, PT_FPR7,
94 PT_FPR8, PT_FPR9, PT_FPR10, PT_FPR11,
95 PT_FPR12, PT_FPR13, PT_FPR14, PT_FPR15,
101 s390_cannot_fetch_register (int regno)
107 s390_cannot_store_register (int regno)
113 s390_collect_ptrace_register (struct regcache *regcache, int regno, char *buf)
115 int size = register_size (regno);
116 if (size < sizeof (long))
118 int regaddr = the_low_target.regmap[regno];
120 memset (buf, 0, sizeof (long));
122 if ((regno ^ 1) < the_low_target.num_regs
123 && the_low_target.regmap[regno ^ 1] == regaddr)
125 collect_register (regcache, regno & ~1, buf);
126 collect_register (regcache, (regno & ~1) + 1,
127 buf + sizeof (long) - size);
129 else if (regaddr == PT_PSWADDR
130 || (regaddr >= PT_GPR0 && regaddr <= PT_GPR15))
131 collect_register (regcache, regno, buf + sizeof (long) - size);
133 collect_register (regcache, regno, buf);
135 /* When debugging a 32-bit inferior on a 64-bit host, make sure
136 the 31-bit addressing mode bit is set in the PSW mask. */
137 if (regaddr == PT_PSWMASK)
141 collect_register (regcache, regno, buf);
145 s390_supply_ptrace_register (struct regcache *regcache,
146 int regno, const char *buf)
148 int size = register_size (regno);
149 if (size < sizeof (long))
151 int regaddr = the_low_target.regmap[regno];
153 if ((regno ^ 1) < the_low_target.num_regs
154 && the_low_target.regmap[regno ^ 1] == regaddr)
156 supply_register (regcache, regno & ~1, buf);
157 supply_register (regcache, (regno & ~1) + 1,
158 buf + sizeof (long) - size);
160 else if (regaddr == PT_PSWADDR
161 || (regaddr >= PT_GPR0 && regaddr <= PT_GPR15))
162 supply_register (regcache, regno, buf + sizeof (long) - size);
164 supply_register (regcache, regno, buf);
167 supply_register (regcache, regno, buf);
170 /* Provide only a fill function for the general register set. ps_lgetregs
171 will use this for NPTL support. */
173 static void s390_fill_gregset (struct regcache *regcache, void *buf)
177 for (i = 0; i < the_low_target.num_regs; i++)
179 if (the_low_target.regmap[i] < PT_PSWMASK
180 || the_low_target.regmap[i] > PT_ACR15)
183 s390_collect_ptrace_register (regcache, i, (char *) buf
184 + the_low_target.regmap[i]);
188 struct regset_info target_regsets[] = {
189 { 0, 0, 0, 0, GENERAL_REGS, s390_fill_gregset, NULL },
190 { 0, 0, 0, -1, -1, NULL, NULL }
194 static const unsigned char s390_breakpoint[] = { 0, 1 };
195 #define s390_breakpoint_len 2
198 s390_get_pc (struct regcache *regcache)
200 if (register_size (0) == 4)
203 collect_register_by_name (regcache, "pswa", &pc);
212 collect_register_by_name (regcache, "pswa", &pc);
218 s390_set_pc (struct regcache *regcache, CORE_ADDR newpc)
220 if (register_size (0) == 4)
222 unsigned int pc = newpc;
226 supply_register_by_name (regcache, "pswa", &pc);
230 unsigned long pc = newpc;
231 supply_register_by_name (regcache, "pswa", &pc);
237 s390_get_hwcap (void)
239 int wordsize = register_size (0);
240 unsigned char *data = alloca (2 * wordsize);
243 while ((*the_target->read_auxv) (offset, data, 2 * wordsize) == 2 * wordsize)
247 unsigned int *data_p = (unsigned int *)data;
248 if (data_p[0] == AT_HWCAP)
253 unsigned long *data_p = (unsigned long *)data;
254 if (data_p[0] == AT_HWCAP)
258 offset += 2 * wordsize;
266 s390_arch_setup (void)
268 /* Assume 31-bit inferior process. */
269 init_registers_s390_linux32 ();
270 the_low_target.num_regs = s390_num_regs;
271 the_low_target.regmap = s390_regmap;
273 /* On a 64-bit host, check the low bit of the (31-bit) PSWM
274 -- if this is one, we actually have a 64-bit inferior. */
278 struct regcache *regcache = new_register_cache ();
279 fetch_inferior_registers (regcache, find_regno ("pswm"));
280 collect_register_by_name (regcache, "pswm", &pswm);
281 free_register_cache (regcache);
284 init_registers_s390x_linux64 ();
286 /* For a 31-bit inferior, check whether the kernel supports
287 using the full 64-bit GPRs. */
288 else if (s390_get_hwcap () & HWCAP_S390_HIGH_GPRS)
290 init_registers_s390_linux64 ();
291 the_low_target.num_regs = s390_num_regs_3264;
292 the_low_target.regmap = s390_regmap_3264;
300 s390_breakpoint_at (CORE_ADDR pc)
302 unsigned char c[s390_breakpoint_len];
303 read_inferior_memory (pc, c, s390_breakpoint_len);
304 return memcmp (c, s390_breakpoint, s390_breakpoint_len) == 0;
308 struct linux_target_ops the_low_target = {
312 s390_cannot_fetch_register,
313 s390_cannot_store_register,
325 s390_collect_ptrace_register,
326 s390_supply_ptrace_register,