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/bits.h>
11 #include <uapi/asm/ptrace.h>
12
13 #define PIF_SYSCALL 0 /* inside a system call */
14 #define PIF_SYSCALL_RESTART 1 /* restart the current system call */
15 #define PIF_SYSCALL_RET_SET 2 /* return value was set via ptrace */
16 #define PIF_GUEST_FAULT 3 /* indicates program check in sie64a */
17
18 #define _PIF_SYSCALL BIT(PIF_SYSCALL)
19 #define _PIF_SYSCALL_RESTART BIT(PIF_SYSCALL_RESTART)
20 #define _PIF_SYSCALL_RET_SET BIT(PIF_SYSCALL_RET_SET)
21 #define _PIF_GUEST_FAULT BIT(PIF_GUEST_FAULT)
22
23 #ifndef __ASSEMBLY__
24
25 #define PSW_KERNEL_BITS (PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_ASC_HOME | \
26 PSW_MASK_EA | PSW_MASK_BA)
27 #define PSW_USER_BITS (PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | \
28 PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_MCHECK | \
29 PSW_MASK_PSTATE | PSW_ASC_PRIMARY)
30
31 struct psw_bits {
32 unsigned long : 1;
33 unsigned long per : 1; /* PER-Mask */
34 unsigned long : 3;
35 unsigned long dat : 1; /* DAT Mode */
36 unsigned long io : 1; /* Input/Output Mask */
37 unsigned long ext : 1; /* External Mask */
38 unsigned long key : 4; /* PSW Key */
39 unsigned long : 1;
40 unsigned long mcheck : 1; /* Machine-Check Mask */
41 unsigned long wait : 1; /* Wait State */
42 unsigned long pstate : 1; /* Problem State */
43 unsigned long as : 2; /* Address Space Control */
44 unsigned long cc : 2; /* Condition Code */
45 unsigned long pm : 4; /* Program Mask */
46 unsigned long ri : 1; /* Runtime Instrumentation */
47 unsigned long : 6;
48 unsigned long eaba : 2; /* Addressing Mode */
49 unsigned long : 31;
50 unsigned long ia : 64; /* Instruction Address */
51 };
52
53 enum {
54 PSW_BITS_AMODE_24BIT = 0,
55 PSW_BITS_AMODE_31BIT = 1,
56 PSW_BITS_AMODE_64BIT = 3
57 };
58
59 enum {
60 PSW_BITS_AS_PRIMARY = 0,
61 PSW_BITS_AS_ACCREG = 1,
62 PSW_BITS_AS_SECONDARY = 2,
63 PSW_BITS_AS_HOME = 3
64 };
65
66 #define psw_bits(__psw) (*({ \
67 typecheck(psw_t, __psw); \
68 &(*(struct psw_bits *)(&(__psw))); \
69 }))
70
71 #define PGM_INT_CODE_MASK 0x7f
72 #define PGM_INT_CODE_PER 0x80
73
74 /*
75 * The pt_regs struct defines the way the registers are stored on
76 * the stack during a system call.
77 */
78 struct pt_regs
79 {
80 union {
81 user_pt_regs user_regs;
82 struct {
83 unsigned long args[1];
84 psw_t psw;
85 unsigned long gprs[NUM_GPRS];
86 };
87 };
88 unsigned long orig_gpr2;
89 unsigned int int_code;
90 unsigned int int_parm;
91 unsigned long int_parm_long;
92 unsigned long flags;
93 unsigned long cr1;
94 };
95
96 /*
97 * Program event recording (PER) register set.
98 */
99 struct per_regs {
100 unsigned long control; /* PER control bits */
101 unsigned long start; /* PER starting address */
102 unsigned long end; /* PER ending address */
103 };
104
105 /*
106 * PER event contains information about the cause of the last PER exception.
107 */
108 struct per_event {
109 unsigned short cause; /* PER code, ATMID and AI */
110 unsigned long address; /* PER address */
111 unsigned char paid; /* PER access identification */
112 };
113
114 /*
115 * Simplified per_info structure used to decode the ptrace user space ABI.
116 */
117 struct per_struct_kernel {
118 unsigned long cr9; /* PER control bits */
119 unsigned long cr10; /* PER starting address */
120 unsigned long cr11; /* PER ending address */
121 unsigned long bits; /* Obsolete software bits */
122 unsigned long starting_addr; /* User specified start address */
123 unsigned long ending_addr; /* User specified end address */
124 unsigned short perc_atmid; /* PER trap ATMID */
125 unsigned long address; /* PER trap instruction address */
126 unsigned char access_id; /* PER trap access identification */
127 };
128
129 #define PER_EVENT_MASK 0xEB000000UL
130
131 #define PER_EVENT_BRANCH 0x80000000UL
132 #define PER_EVENT_IFETCH 0x40000000UL
133 #define PER_EVENT_STORE 0x20000000UL
134 #define PER_EVENT_STORE_REAL 0x08000000UL
135 #define PER_EVENT_TRANSACTION_END 0x02000000UL
136 #define PER_EVENT_NULLIFICATION 0x01000000UL
137
138 #define PER_CONTROL_MASK 0x00e00000UL
139
140 #define PER_CONTROL_BRANCH_ADDRESS 0x00800000UL
141 #define PER_CONTROL_SUSPENSION 0x00400000UL
142 #define PER_CONTROL_ALTERATION 0x00200000UL
143
set_pt_regs_flag(struct pt_regs * regs,int flag)144 static inline void set_pt_regs_flag(struct pt_regs *regs, int flag)
145 {
146 regs->flags |= (1UL << flag);
147 }
148
clear_pt_regs_flag(struct pt_regs * regs,int flag)149 static inline void clear_pt_regs_flag(struct pt_regs *regs, int flag)
150 {
151 regs->flags &= ~(1UL << flag);
152 }
153
test_pt_regs_flag(struct pt_regs * regs,int flag)154 static inline int test_pt_regs_flag(struct pt_regs *regs, int flag)
155 {
156 return !!(regs->flags & (1UL << flag));
157 }
158
159 /*
160 * These are defined as per linux/ptrace.h, which see.
161 */
162 #define arch_has_single_step() (1)
163 #define arch_has_block_step() (1)
164
165 #define user_mode(regs) (((regs)->psw.mask & PSW_MASK_PSTATE) != 0)
166 #define instruction_pointer(regs) ((regs)->psw.addr)
167 #define user_stack_pointer(regs)((regs)->gprs[15])
168 #define profile_pc(regs) instruction_pointer(regs)
169
regs_return_value(struct pt_regs * regs)170 static inline long regs_return_value(struct pt_regs *regs)
171 {
172 return regs->gprs[2];
173 }
174
instruction_pointer_set(struct pt_regs * regs,unsigned long val)175 static inline void instruction_pointer_set(struct pt_regs *regs,
176 unsigned long val)
177 {
178 regs->psw.addr = val;
179 }
180
181 int regs_query_register_offset(const char *name);
182 const char *regs_query_register_name(unsigned int offset);
183 unsigned long regs_get_register(struct pt_regs *regs, unsigned int offset);
184 unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n);
185
kernel_stack_pointer(struct pt_regs * regs)186 static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
187 {
188 return regs->gprs[15];
189 }
190
regs_set_return_value(struct pt_regs * regs,unsigned long rc)191 static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
192 {
193 regs->gprs[2] = rc;
194 }
195
196 #endif /* __ASSEMBLY__ */
197 #endif /* _S390_PTRACE_H */
198