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 */
syscall_get_nr(struct task_struct * task,struct pt_regs * regs)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
syscall_set_nr(struct task_struct * task,struct pt_regs * regs,int nr)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
syscall_rollback(struct task_struct * task,struct pt_regs * regs)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
syscall_has_error(struct pt_regs * regs)53 static inline bool syscall_has_error(struct pt_regs *regs)
54 {
55 return (regs->psr & PSR_C) ? true : false;
56 }
syscall_set_error(struct pt_regs * regs)57 static inline void syscall_set_error(struct pt_regs *regs)
58 {
59 regs->psr |= PSR_C;
60 }
syscall_clear_error(struct pt_regs * regs)61 static inline void syscall_clear_error(struct pt_regs *regs)
62 {
63 regs->psr &= ~PSR_C;
64 }
65 #else
syscall_has_error(struct pt_regs * regs)66 static inline bool syscall_has_error(struct pt_regs *regs)
67 {
68 return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false;
69 }
syscall_set_error(struct pt_regs * regs)70 static inline void syscall_set_error(struct pt_regs *regs)
71 {
72 regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY);
73 }
syscall_clear_error(struct pt_regs * regs)74 static inline void syscall_clear_error(struct pt_regs *regs)
75 {
76 regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY);
77 }
78 #endif
79
syscall_get_error(struct task_struct * task,struct pt_regs * regs)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
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)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
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)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
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned long * args)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
syscall_set_arguments(struct task_struct * task,struct pt_regs * regs,const unsigned long * args)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
syscall_get_arch(struct task_struct * task)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