/* SPDX-License-Identifier: GPL-2.0 */ /* * Access to user system call parameters and results * * Copyright IBM Corp. 2008 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) */ #ifndef _ASM_SYSCALL_H #define _ASM_SYSCALL_H 1 #include #include #include #include /* * The syscall table always contains 32 bit pointers since we know that the * address of the function to be called is (way) below 4GB. So the "int" * type here is what we want [need] for both 32 bit and 64 bit systems. */ extern const unsigned int sys_call_table[]; extern const unsigned int sys_call_table_emu[]; static inline long syscall_get_nr(struct task_struct *task, struct pt_regs *regs) { return test_pt_regs_flag(regs, PIF_SYSCALL) ? (regs->int_code & 0xffff) : -1; } static inline void syscall_rollback(struct task_struct *task, struct pt_regs *regs) { regs->gprs[2] = regs->orig_gpr2; } static inline long syscall_get_error(struct task_struct *task, struct pt_regs *regs) { return IS_ERR_VALUE(regs->gprs[2]) ? regs->gprs[2] : 0; } static inline long syscall_get_return_value(struct task_struct *task, struct pt_regs *regs) { return regs->gprs[2]; } static inline void syscall_set_return_value(struct task_struct *task, struct pt_regs *regs, int error, long val) { regs->gprs[2] = error ? error : val; } static inline void syscall_get_arguments(struct task_struct *task, struct pt_regs *regs, unsigned long *args) { unsigned long mask = -1UL; unsigned int n = 6; #ifdef CONFIG_COMPAT if (test_tsk_thread_flag(task, TIF_31BIT)) mask = 0xffffffff; #endif while (n-- > 0) if (n > 0) args[n] = regs->gprs[2 + n] & mask; args[0] = regs->orig_gpr2 & mask; } static inline void syscall_set_arguments(struct task_struct *task, struct pt_regs *regs, unsigned int i, unsigned int n, const unsigned long *args) { BUG_ON(i + n > 6); while (n-- > 0) if (i + n > 0) regs->gprs[2 + i + n] = args[n]; if (i == 0) regs->orig_gpr2 = args[0]; } static inline int syscall_get_arch(void) { #ifdef CONFIG_COMPAT if (test_tsk_thread_flag(current, TIF_31BIT)) return AUDIT_ARCH_S390; #endif return AUDIT_ARCH_S390X; } #endif /* _ASM_SYSCALL_H */