1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * S390 version
4 * Copyright IBM Corp. 1999, 2000
5 * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
6 */
7 #ifndef _S390_PTRACE_H
8 #define _S390_PTRACE_H
9
10 #include <linux/const.h>
11 #include <uapi/asm/ptrace.h>
12
13 #define PIF_SYSCALL 0 /* inside a system call */
14 #define PIF_PER_TRAP 1 /* deliver sigtrap on return to user */
15 #define PIF_SYSCALL_RESTART 2 /* restart the current system call */
16
17 #define _PIF_SYSCALL _BITUL(PIF_SYSCALL)
18 #define _PIF_PER_TRAP _BITUL(PIF_PER_TRAP)
19 #define _PIF_SYSCALL_RESTART _BITUL(PIF_SYSCALL_RESTART)
20
21 #ifndef __ASSEMBLY__
22
23 #define PSW_KERNEL_BITS (PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_HOME | \
24 PSW_MASK_EA | PSW_MASK_BA)
25 #define PSW_USER_BITS (PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | \
26 PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK | \
27 PSW_MASK_PSTATE | PSW_ASC_PRIMARY)
28
29 struct psw_bits {
30 unsigned long : 1;
31 unsigned long per : 1; /* PER-Mask */
32 unsigned long : 3;
33 unsigned long dat : 1; /* DAT Mode */
34 unsigned long io : 1; /* Input/Output Mask */
35 unsigned long ext : 1; /* External Mask */
36 unsigned long key : 4; /* PSW Key */
37 unsigned long : 1;
38 unsigned long mcheck : 1; /* Machine-Check Mask */
39 unsigned long wait : 1; /* Wait State */
40 unsigned long pstate : 1; /* Problem State */
41 unsigned long as : 2; /* Address Space Control */
42 unsigned long cc : 2; /* Condition Code */
43 unsigned long pm : 4; /* Program Mask */
44 unsigned long ri : 1; /* Runtime Instrumentation */
45 unsigned long : 6;
46 unsigned long eaba : 2; /* Addressing Mode */
47 unsigned long : 31;
48 unsigned long ia : 64; /* Instruction Address */
49 };
50
51 enum {
52 PSW_BITS_AMODE_24BIT = 0,
53 PSW_BITS_AMODE_31BIT = 1,
54 PSW_BITS_AMODE_64BIT = 3
55 };
56
57 enum {
58 PSW_BITS_AS_PRIMARY = 0,
59 PSW_BITS_AS_ACCREG = 1,
60 PSW_BITS_AS_SECONDARY = 2,
61 PSW_BITS_AS_HOME = 3
62 };
63
64 #define psw_bits(__psw) (*({ \
65 typecheck(psw_t, __psw); \
66 &(*(struct psw_bits *)(&(__psw))); \
67 }))
68
69 /*
70 * The pt_regs struct defines the way the registers are stored on
71 * the stack during a system call.
72 */
73 struct pt_regs
74 {
75 unsigned long args[1];
76 psw_t psw;
77 unsigned long gprs[NUM_GPRS];
78 unsigned long orig_gpr2;
79 unsigned int int_code;
80 unsigned int int_parm;
81 unsigned long int_parm_long;
82 unsigned long flags;
83 };
84
85 /*
86 * Program event recording (PER) register set.
87 */
88 struct per_regs {
89 unsigned long control; /* PER control bits */
90 unsigned long start; /* PER starting address */
91 unsigned long end; /* PER ending address */
92 };
93
94 /*
95 * PER event contains information about the cause of the last PER exception.
96 */
97 struct per_event {
98 unsigned short cause; /* PER code, ATMID and AI */
99 unsigned long address; /* PER address */
100 unsigned char paid; /* PER access identification */
101 };
102
103 /*
104 * Simplified per_info structure used to decode the ptrace user space ABI.
105 */
106 struct per_struct_kernel {
107 unsigned long cr9; /* PER control bits */
108 unsigned long cr10; /* PER starting address */
109 unsigned long cr11; /* PER ending address */
110 unsigned long bits; /* Obsolete software bits */
111 unsigned long starting_addr; /* User specified start address */
112 unsigned long ending_addr; /* User specified end address */
113 unsigned short perc_atmid; /* PER trap ATMID */
114 unsigned long address; /* PER trap instruction address */
115 unsigned char access_id; /* PER trap access identification */
116 };
117
118 #define PER_EVENT_MASK 0xEB000000UL
119
120 #define PER_EVENT_BRANCH 0x80000000UL
121 #define PER_EVENT_IFETCH 0x40000000UL
122 #define PER_EVENT_STORE 0x20000000UL
123 #define PER_EVENT_STORE_REAL 0x08000000UL
124 #define PER_EVENT_TRANSACTION_END 0x02000000UL
125 #define PER_EVENT_NULLIFICATION 0x01000000UL
126
127 #define PER_CONTROL_MASK 0x00e00000UL
128
129 #define PER_CONTROL_BRANCH_ADDRESS 0x00800000UL
130 #define PER_CONTROL_SUSPENSION 0x00400000UL
131 #define PER_CONTROL_ALTERATION 0x00200000UL
132
set_pt_regs_flag(struct pt_regs * regs,int flag)133 static inline void set_pt_regs_flag(struct pt_regs *regs, int flag)
134 {
135 regs->flags |= (1UL << flag);
136 }
137
clear_pt_regs_flag(struct pt_regs * regs,int flag)138 static inline void clear_pt_regs_flag(struct pt_regs *regs, int flag)
139 {
140 regs->flags &= ~(1UL << flag);
141 }
142
test_pt_regs_flag(struct pt_regs * regs,int flag)143 static inline int test_pt_regs_flag(struct pt_regs *regs, int flag)
144 {
145 return !!(regs->flags & (1UL << flag));
146 }
147
148 /*
149 * These are defined as per linux/ptrace.h, which see.
150 */
151 #define arch_has_single_step() (1)
152 #define arch_has_block_step() (1)
153
154 #define user_mode(regs) (((regs)->psw.mask & PSW_MASK_PSTATE) != 0)
155 #define instruction_pointer(regs) ((regs)->psw.addr)
156 #define user_stack_pointer(regs)((regs)->gprs[15])
157 #define profile_pc(regs) instruction_pointer(regs)
158
regs_return_value(struct pt_regs * regs)159 static inline long regs_return_value(struct pt_regs *regs)
160 {
161 return regs->gprs[2];
162 }
163
instruction_pointer_set(struct pt_regs * regs,unsigned long val)164 static inline void instruction_pointer_set(struct pt_regs *regs,
165 unsigned long val)
166 {
167 regs->psw.addr = val;
168 }
169
170 int regs_query_register_offset(const char *name);
171 const char *regs_query_register_name(unsigned int offset);
172 unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset);
173 unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n);
174
kernel_stack_pointer(struct pt_regs * regs)175 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
176 {
177 return regs->gprs[15];
178 }
179
180 #endif /* __ASSEMBLY__ */
181 #endif /* _S390_PTRACE_H */
182