155 lines
3.8 KiB
C
155 lines
3.8 KiB
C
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/* 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 (schwidefsky@de.ibm.com)
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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 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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#define SYSCALL_FMT_0
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#define SYSCALL_FMT_1 , "0" (r2)
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#define SYSCALL_FMT_2 , "d" (r3) SYSCALL_FMT_1
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#define SYSCALL_FMT_3 , "d" (r4) SYSCALL_FMT_2
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#define SYSCALL_FMT_4 , "d" (r5) SYSCALL_FMT_3
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#define SYSCALL_FMT_5 , "d" (r6) SYSCALL_FMT_4
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#define SYSCALL_FMT_6 , "d" (r7) SYSCALL_FMT_5
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#define SYSCALL_PARM_0
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#define SYSCALL_PARM_1 , long arg1
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#define SYSCALL_PARM_2 SYSCALL_PARM_1, long arg2
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#define SYSCALL_PARM_3 SYSCALL_PARM_2, long arg3
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#define SYSCALL_PARM_4 SYSCALL_PARM_3, long arg4
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#define SYSCALL_PARM_5 SYSCALL_PARM_4, long arg5
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#define SYSCALL_PARM_6 SYSCALL_PARM_5, long arg6
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#define SYSCALL_REGS_0
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#define SYSCALL_REGS_1 \
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register long r2 asm("2") = arg1
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#define SYSCALL_REGS_2 \
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SYSCALL_REGS_1; \
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register long r3 asm("3") = arg2
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#define SYSCALL_REGS_3 \
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SYSCALL_REGS_2; \
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register long r4 asm("4") = arg3
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#define SYSCALL_REGS_4 \
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SYSCALL_REGS_3; \
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register long r5 asm("5") = arg4
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#define SYSCALL_REGS_5 \
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SYSCALL_REGS_4; \
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register long r6 asm("6") = arg5
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#define SYSCALL_REGS_6 \
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SYSCALL_REGS_5; \
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register long r7 asm("7") = arg6
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#define GENERATE_SYSCALL_FUNC(nr) \
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static __always_inline \
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long syscall##nr(unsigned long syscall SYSCALL_PARM_##nr) \
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{ \
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register unsigned long r1 asm ("1") = syscall; \
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register long rc asm ("2"); \
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SYSCALL_REGS_##nr; \
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\
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asm volatile ( \
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" svc 0\n" \
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: "=d" (rc) \
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: "d" (r1) SYSCALL_FMT_##nr \
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: "memory"); \
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return rc; \
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}
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GENERATE_SYSCALL_FUNC(0)
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GENERATE_SYSCALL_FUNC(1)
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GENERATE_SYSCALL_FUNC(2)
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GENERATE_SYSCALL_FUNC(3)
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GENERATE_SYSCALL_FUNC(4)
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GENERATE_SYSCALL_FUNC(5)
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GENERATE_SYSCALL_FUNC(6)
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#endif /* _ASM_SYSCALL_H */
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