1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_SPARC_SYSCALL_H
3 #define __ASM_SPARC_SYSCALL_H
4 
5 #include <uapi/linux/audit.h>
6 #include <linux/kernel.h>
7 #include <linux/compat.h>
8 #include <linux/sched.h>
9 #include <asm/ptrace.h>
10 #include <asm/thread_info.h>
11 
12 /*
13  * The syscall table always contains 32 bit pointers since we know that the
14  * address of the function to be called is (way) below 4GB.  So the "int"
15  * type here is what we want [need] for both 32 bit and 64 bit systems.
16  */
17 extern const unsigned int sys_call_table[];
18 
19 /* The system call number is given by the user in %g1 */
20 static inline long syscall_get_nr(struct task_struct *task,
21 				  struct pt_regs *regs)
22 {
23 	int syscall_p = pt_regs_is_syscall(regs);
24 
25 	return (syscall_p ? regs->u_regs[UREG_G1] : -1L);
26 }
27 
28 static inline void syscall_set_nr(struct task_struct *task,
29 				  struct pt_regs *regs,
30 				  int nr)
31 {
32 	/*
33 	 * Unlike syscall_get_nr(), syscall_set_nr() can be called only when
34 	 * the target task is stopped for tracing on entering syscall, so
35 	 * there is no need to have the same check syscall_get_nr() has.
36 	 */
37 	regs->u_regs[UREG_G1] = nr;
38 }
39 
40 static inline void syscall_rollback(struct task_struct *task,
41 				    struct pt_regs *regs)
42 {
43 	/* XXX This needs some thought.  On Sparc we don't
44 	 * XXX save away the original %o0 value somewhere.
45 	 * XXX Instead we hold it in register %l5 at the top
46 	 * XXX level trap frame and pass this down to the signal
47 	 * XXX dispatch code which is the only place that value
48 	 * XXX ever was needed.
49 	 */
50 }
51 
52 #ifdef CONFIG_SPARC32
53 static inline bool syscall_has_error(struct pt_regs *regs)
54 {
55 	return (regs->psr & PSR_C) ? true : false;
56 }
57 static inline void syscall_set_error(struct pt_regs *regs)
58 {
59 	regs->psr |= PSR_C;
60 }
61 static inline void syscall_clear_error(struct pt_regs *regs)
62 {
63 	regs->psr &= ~PSR_C;
64 }
65 #else
66 static inline bool syscall_has_error(struct pt_regs *regs)
67 {
68 	return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false;
69 }
70 static inline void syscall_set_error(struct pt_regs *regs)
71 {
72 	regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY);
73 }
74 static inline void syscall_clear_error(struct pt_regs *regs)
75 {
76 	regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY);
77 }
78 #endif
79 
80 static inline long syscall_get_error(struct task_struct *task,
81 				     struct pt_regs *regs)
82 {
83 	long val = regs->u_regs[UREG_I0];
84 
85 	return (syscall_has_error(regs) ? -val : 0);
86 }
87 
88 static inline long syscall_get_return_value(struct task_struct *task,
89 					    struct pt_regs *regs)
90 {
91 	long val = regs->u_regs[UREG_I0];
92 
93 	return val;
94 }
95 
96 static inline void syscall_set_return_value(struct task_struct *task,
97 					    struct pt_regs *regs,
98 					    int error, long val)
99 {
100 	if (error) {
101 		syscall_set_error(regs);
102 		regs->u_regs[UREG_I0] = -error;
103 	} else {
104 		syscall_clear_error(regs);
105 		regs->u_regs[UREG_I0] = val;
106 	}
107 }
108 
109 static inline void syscall_get_arguments(struct task_struct *task,
110 					 struct pt_regs *regs,
111 					 unsigned long *args)
112 {
113 	int zero_extend = 0;
114 	unsigned int j;
115 	unsigned int n = 6;
116 
117 #ifdef CONFIG_SPARC64
118 	if (test_tsk_thread_flag(task, TIF_32BIT))
119 		zero_extend = 1;
120 #endif
121 
122 	for (j = 0; j < n; j++) {
123 		unsigned long val = regs->u_regs[UREG_I0 + j];
124 
125 		if (zero_extend)
126 			args[j] = (u32) val;
127 		else
128 			args[j] = val;
129 	}
130 }
131 
132 static inline void syscall_set_arguments(struct task_struct *task,
133 					 struct pt_regs *regs,
134 					 const unsigned long *args)
135 {
136 	unsigned int i;
137 
138 	for (i = 0; i < 6; i++)
139 		regs->u_regs[UREG_I0 + i] = args[i];
140 }
141 
142 static inline int syscall_get_arch(struct task_struct *task)
143 {
144 #if defined(CONFIG_SPARC64) && defined(CONFIG_COMPAT)
145 	return test_tsk_thread_flag(task, TIF_32BIT)
146 		? AUDIT_ARCH_SPARC : AUDIT_ARCH_SPARC64;
147 #elif defined(CONFIG_SPARC64)
148 	return AUDIT_ARCH_SPARC64;
149 #else
150 	return AUDIT_ARCH_SPARC;
151 #endif
152 }
153 
154 #endif /* __ASM_SPARC_SYSCALL_H */
155