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107 lines
2.4 KiB
107 lines
2.4 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* Access to user system call parameters and results |
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* |
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* Copyright IBM Corp. 2008 |
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* Author(s): Martin Schwidefsky ([email protected]) |
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*/ |
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#ifndef _ASM_SYSCALL_H |
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#define _ASM_SYSCALL_H 1 |
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#include <uapi/linux/audit.h> |
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#include <linux/sched.h> |
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#include <linux/err.h> |
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#include <asm/ptrace.h> |
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extern const sys_call_ptr_t sys_call_table[]; |
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extern const sys_call_ptr_t sys_call_table_emu[]; |
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static inline long syscall_get_nr(struct task_struct *task, |
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struct pt_regs *regs) |
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{ |
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return test_pt_regs_flag(regs, PIF_SYSCALL) ? |
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(regs->int_code & 0xffff) : -1; |
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} |
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static inline void syscall_rollback(struct task_struct *task, |
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struct pt_regs *regs) |
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{ |
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regs->gprs[2] = regs->orig_gpr2; |
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} |
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static inline long syscall_get_error(struct task_struct *task, |
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struct pt_regs *regs) |
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{ |
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unsigned long error = regs->gprs[2]; |
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#ifdef CONFIG_COMPAT |
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if (test_tsk_thread_flag(task, TIF_31BIT)) { |
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/* |
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* Sign-extend the value so (int)-EFOO becomes (long)-EFOO |
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* and will match correctly in comparisons. |
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*/ |
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error = (long)(int)error; |
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} |
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#endif |
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return IS_ERR_VALUE(error) ? error : 0; |
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} |
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static inline long syscall_get_return_value(struct task_struct *task, |
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struct pt_regs *regs) |
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{ |
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return regs->gprs[2]; |
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} |
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static inline void syscall_set_return_value(struct task_struct *task, |
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struct pt_regs *regs, |
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int error, long val) |
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{ |
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set_pt_regs_flag(regs, PIF_SYSCALL_RET_SET); |
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regs->gprs[2] = error ? error : val; |
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} |
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static inline void syscall_get_arguments(struct task_struct *task, |
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struct pt_regs *regs, |
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unsigned long *args) |
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{ |
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unsigned long mask = -1UL; |
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unsigned int n = 6; |
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#ifdef CONFIG_COMPAT |
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if (test_tsk_thread_flag(task, TIF_31BIT)) |
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mask = 0xffffffff; |
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#endif |
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while (n-- > 0) |
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if (n > 0) |
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args[n] = regs->gprs[2 + n] & mask; |
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args[0] = regs->orig_gpr2 & mask; |
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} |
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static inline void syscall_set_arguments(struct task_struct *task, |
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struct pt_regs *regs, |
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const unsigned long *args) |
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{ |
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unsigned int n = 6; |
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while (n-- > 0) |
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if (n > 0) |
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regs->gprs[2 + n] = args[n]; |
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regs->orig_gpr2 = args[0]; |
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} |
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static inline int syscall_get_arch(struct task_struct *task) |
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{ |
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#ifdef CONFIG_COMPAT |
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if (test_tsk_thread_flag(task, TIF_31BIT)) |
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return AUDIT_ARCH_S390; |
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#endif |
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return AUDIT_ARCH_S390X; |
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} |
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static inline bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs) |
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{ |
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return false; |
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} |
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#endif /* _ASM_SYSCALL_H */
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