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
,