xref: /openbmc/linux/arch/sparc/include/asm/syscall.h (revision 7962c2ed)
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_rollback(struct task_struct * task,struct pt_regs * regs)28 static inline void syscall_rollback(struct task_struct *task,
29 				    struct pt_regs *regs)
30 {
31 	/* XXX This needs some thought.  On Sparc we don't
32 	 * XXX save away the original %o0 value somewhere.
33 	 * XXX Instead we hold it in register %l5 at the top
34 	 * XXX level trap frame and pass this down to the signal
35 	 * XXX dispatch code which is the only place that value
36 	 * XXX ever was needed.
37 	 */
38 }
39 
40 #ifdef CONFIG_SPARC32
syscall_has_error(struct pt_regs * regs)41 static inline bool syscall_has_error(struct pt_regs *regs)
42 {
43 	return (regs->psr & PSR_C) ? true : false;
44 }
syscall_set_error(struct pt_regs * regs)45 static inline void syscall_set_error(struct pt_regs *regs)
46 {
47 	regs->psr |= PSR_C;
48 }
syscall_clear_error(struct pt_regs * regs)49 static inline void syscall_clear_error(struct pt_regs *regs)
50 {
51 	regs->psr &= ~PSR_C;
52 }
53 #else
syscall_has_error(struct pt_regs * regs)54 static inline bool syscall_has_error(struct pt_regs *regs)
55 {
56 	return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false;
57 }
syscall_set_error(struct pt_regs * regs)58 static inline void syscall_set_error(struct pt_regs *regs)
59 {
60 	regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY);
61 }
syscall_clear_error(struct pt_regs * regs)62 static inline void syscall_clear_error(struct pt_regs *regs)
63 {
64 	regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY);
65 }
66 #endif
67 
syscall_get_error(struct task_struct * task,struct pt_regs * regs)68 static inline long syscall_get_error(struct task_struct *task,
69 				     struct pt_regs *regs)
70 {
71 	long val = regs->u_regs[UREG_I0];
72 
73 	return (syscall_has_error(regs) ? -val : 0);
74 }
75 
syscall_get_return_value(struct task_struct * task,struct pt_regs * regs)76 static inline long syscall_get_return_value(struct task_struct *task,
77 					    struct pt_regs *regs)
78 {
79 	long val = regs->u_regs[UREG_I0];
80 
81 	return val;
82 }
83 
syscall_set_return_value(struct task_struct * task,struct pt_regs * regs,int error,long val)84 static inline void syscall_set_return_value(struct task_struct *task,
85 					    struct pt_regs *regs,
86 					    int error, long val)
87 {
88 	if (error) {
89 		syscall_set_error(regs);
90 		regs->u_regs[UREG_I0] = -error;
91 	} else {
92 		syscall_clear_error(regs);
93 		regs->u_regs[UREG_I0] = val;
94 	}
95 }
96 
syscall_get_arguments(struct task_struct * task,struct pt_regs * regs,unsigned long * args)97 static inline void syscall_get_arguments(struct task_struct *task,
98 					 struct pt_regs *regs,
99 					 unsigned long *args)
100 {
101 	int zero_extend = 0;
102 	unsigned int j;
103 	unsigned int n = 6;
104 
105 #ifdef CONFIG_SPARC64
106 	if (test_tsk_thread_flag(task, TIF_32BIT))
107 		zero_extend = 1;
108 #endif
109 
110 	for (j = 0; j < n; j++) {
111 		unsigned long val = regs->u_regs[UREG_I0 + j];
112 
113 		if (zero_extend)
114 			args[j] = (u32) val;
115 		else
116 			args[j] = val;
117 	}
118 }
119 
syscall_get_arch(struct task_struct * task)120 static inline int syscall_get_arch(struct task_struct *task)
121 {
122 #if defined(CONFIG_SPARC64) && defined(CONFIG_COMPAT)
123 	return test_tsk_thread_flag(task, TIF_32BIT)
124 		? AUDIT_ARCH_SPARC : AUDIT_ARCH_SPARC64;
125 #elif defined(CONFIG_SPARC64)
126 	return AUDIT_ARCH_SPARC64;
127 #else
128 	return AUDIT_ARCH_SPARC;
129 #endif
130 }
131 
132 #endif /* __ASM_SPARC_SYSCALL_H */
133