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154 lines
3.8 KiB
154 lines
3.8 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 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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