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_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 41 static inline bool syscall_has_error(struct pt_regs *regs) 42 { 43 return (regs->psr & PSR_C) ? true : false; 44 } 45 static inline void syscall_set_error(struct pt_regs *regs) 46 { 47 regs->psr |= PSR_C; 48 } 49 static inline void syscall_clear_error(struct pt_regs *regs) 50 { 51 regs->psr &= ~PSR_C; 52 } 53 #else 54 static inline bool syscall_has_error(struct pt_regs *regs) 55 { 56 return (regs->tstate & (TSTATE_XCARRY | TSTATE_ICARRY)) ? true : false; 57 } 58 static inline void syscall_set_error(struct pt_regs *regs) 59 { 60 regs->tstate |= (TSTATE_XCARRY | TSTATE_ICARRY); 61 } 62 static inline void syscall_clear_error(struct pt_regs *regs) 63 { 64 regs->tstate &= ~(TSTATE_XCARRY | TSTATE_ICARRY); 65 } 66 #endif 67 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 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 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 97 static inline void syscall_get_arguments(struct task_struct *task, 98 struct pt_regs *regs, 99 unsigned int i, unsigned int n, 100 unsigned long *args) 101 { 102 int zero_extend = 0; 103 unsigned int j; 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 + i + j]; 112 113 if (zero_extend) 114 args[j] = (u32) val; 115 else 116 args[j] = val; 117 } 118 } 119 120 static inline void syscall_set_arguments(struct task_struct *task, 121 struct pt_regs *regs, 122 unsigned int i, unsigned int n, 123 const unsigned long *args) 124 { 125 unsigned int j; 126 127 for (j = 0; j < n; j++) 128 regs->u_regs[UREG_I0 + i + j] = args[j]; 129 } 130 131 static inline int syscall_get_arch(void) 132 { 133 #if defined(CONFIG_SPARC64) && defined(CONFIG_COMPAT) 134 return in_compat_syscall() ? AUDIT_ARCH_SPARC : AUDIT_ARCH_SPARC64; 135 #elif defined(CONFIG_SPARC64) 136 return AUDIT_ARCH_SPARC64; 137 #else 138 return AUDIT_ARCH_SPARC; 139 #endif 140 } 141 142 #endif /* __ASM_SPARC_SYSCALL_H */ 143