1 /* GNU/Linux S/390 specific low level interface, for the remote server
3 Copyright (C) 2001, 2002, 2005, 2006, 2007, 2008, 2009, 2010
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
, PT_GPR2
, PT_GPR2
, PT_GPR3
, PT_GPR3
,
77 PT_GPR4
, PT_GPR4
, PT_GPR5
, PT_GPR5
, PT_GPR6
, PT_GPR6
, PT_GPR7
, PT_GPR7
,
78 PT_GPR8
, PT_GPR8
, PT_GPR9
, PT_GPR9
, PT_GPR10
, PT_GPR10
, PT_GPR11
, PT_GPR11
,
79 PT_GPR12
, PT_GPR12
, PT_GPR13
, PT_GPR13
, PT_GPR14
, PT_GPR14
, PT_GPR15
, PT_GPR15
,
81 PT_ACR0
, PT_ACR1
, PT_ACR2
, PT_ACR3
,
82 PT_ACR4
, PT_ACR5
, PT_ACR6
, PT_ACR7
,
83 PT_ACR8
, PT_ACR9
, PT_ACR10
, PT_ACR11
,
84 PT_ACR12
, PT_ACR13
, PT_ACR14
, PT_ACR15
,
88 PT_FPR0
, PT_FPR1
, PT_FPR2
, PT_FPR3
,
89 PT_FPR4
, PT_FPR5
, PT_FPR6
, PT_FPR7
,
90 PT_FPR8
, PT_FPR9
, PT_FPR10
, PT_FPR11
,
91 PT_FPR12
, PT_FPR13
, PT_FPR14
, PT_FPR15
,
97 s390_cannot_fetch_register (int regno
)
103 s390_cannot_store_register (int regno
)
109 s390_collect_ptrace_register (int regno
, char *buf
)
111 int size
= register_size (regno
);
112 if (size
< sizeof (long))
114 int regaddr
= the_low_target
.regmap
[regno
];
116 memset (buf
, 0, sizeof (long));
118 if ((regno
^ 1) < the_low_target
.num_regs
119 && the_low_target
.regmap
[regno
^ 1] == regaddr
)
121 collect_register (regno
& ~1, buf
);
122 collect_register ((regno
& ~1) + 1, buf
+ sizeof (long) - size
);
124 else if (regaddr
== PT_PSWADDR
125 || (regaddr
>= PT_GPR0
&& regaddr
<= PT_GPR15
))
126 collect_register (regno
, buf
+ sizeof (long) - size
);
128 collect_register (regno
, buf
);
130 /* When debugging a 32-bit inferior on a 64-bit host, make sure
131 the 31-bit addressing mode bit is set in the PSW mask. */
132 if (regaddr
== PT_PSWMASK
)
136 collect_register (regno
, buf
);
140 s390_supply_ptrace_register (int regno
, const char *buf
)
142 int size
= register_size (regno
);
143 if (size
< sizeof (long))
145 int regaddr
= the_low_target
.regmap
[regno
];
147 if ((regno
^ 1) < the_low_target
.num_regs
148 && the_low_target
.regmap
[regno
^ 1] == regaddr
)
150 supply_register (regno
& ~1, buf
);
151 supply_register ((regno
& ~1) + 1, buf
+ sizeof (long) - size
);
153 else if (regaddr
== PT_PSWADDR
154 || (regaddr
>= PT_GPR0
&& regaddr
<= PT_GPR15
))
155 supply_register (regno
, buf
+ sizeof (long) - size
);
157 supply_register (regno
, buf
);
160 supply_register (regno
, buf
);
163 /* Provide only a fill function for the general register set. ps_lgetregs
164 will use this for NPTL support. */
166 static void s390_fill_gregset (void *buf
)
170 for (i
= 0; i
< the_low_target
.num_regs
; i
++)
172 if (the_low_target
.regmap
[i
] < PT_PSWMASK
173 || the_low_target
.regmap
[i
] > PT_ACR15
)
176 s390_collect_ptrace_register (i
, (char *) buf
177 + the_low_target
.regmap
[i
]);
181 struct regset_info target_regsets
[] = {
182 { 0, 0, 0, GENERAL_REGS
, s390_fill_gregset
, NULL
},
183 { 0, 0, -1, -1, NULL
, NULL
}
187 static const unsigned char s390_breakpoint
[] = { 0, 1 };
188 #define s390_breakpoint_len 2
193 if (register_size (0) == 4)
196 collect_register_by_name ("pswa", &pc
);
205 collect_register_by_name ("pswa", &pc
);
211 s390_set_pc (CORE_ADDR newpc
)
213 if (register_size (0) == 4)
215 unsigned int pc
= newpc
;
219 supply_register_by_name ("pswa", &pc
);
223 unsigned long pc
= newpc
;
224 supply_register_by_name ("pswa", &pc
);
230 s390_get_hwcap (void)
232 int wordsize
= register_size (0);
233 unsigned char *data
= alloca (2 * wordsize
);
236 while ((*the_target
->read_auxv
) (offset
, data
, 2 * wordsize
) == 2 * wordsize
)
240 unsigned int *data_p
= (unsigned int *)data
;
241 if (data_p
[0] == AT_HWCAP
)
246 unsigned long *data_p
= (unsigned long *)data
;
247 if (data_p
[0] == AT_HWCAP
)
251 offset
+= 2 * wordsize
;
259 s390_arch_setup (void)
261 /* Assume 31-bit inferior process. */
262 init_registers_s390_linux32 ();
263 the_low_target
.num_regs
= s390_num_regs
;
264 the_low_target
.regmap
= s390_regmap
;
266 /* On a 64-bit host, check the low bit of the (31-bit) PSWM
267 -- if this is one, we actually have a 64-bit inferior. */
271 collect_register_by_name ("pswm", &pswm
);
273 init_registers_s390x_linux64 ();
275 /* For a 31-bit inferior, check whether the kernel supports
276 using the full 64-bit GPRs. */
277 else if (s390_get_hwcap () & HWCAP_S390_HIGH_GPRS
)
279 init_registers_s390_linux64 ();
280 the_low_target
.num_regs
= s390_num_regs_3264
;
281 the_low_target
.regmap
= s390_regmap_3264
;
289 s390_breakpoint_at (CORE_ADDR pc
)
291 unsigned char c
[s390_breakpoint_len
];
292 read_inferior_memory (pc
, c
, s390_breakpoint_len
);
293 return memcmp (c
, s390_breakpoint
, s390_breakpoint_len
) == 0;
297 struct linux_target_ops the_low_target
= {
301 s390_cannot_fetch_register
,
302 s390_cannot_store_register
,
314 s390_collect_ptrace_register
,
315 s390_supply_ptrace_register
,