add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/s390/include/asm/syscall.h
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@@ -14,13 +14,8 @@
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 #include <linux/err.h>
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 #include <asm/ptrace.h>
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-/*
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- * The syscall table always contains 32 bit pointers since we know that the
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- * address of the function to be called is (way) below 4GB.  So the "int"
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- * type here is what we want [need] for both 32 bit and 64 bit systems.
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- */
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-extern const unsigned int sys_call_table[];
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-extern const unsigned int sys_call_table_emu[];
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+extern const unsigned long sys_call_table[];
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+extern const unsigned long 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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@@ -66,46 +61,38 @@
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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 int i, unsigned int n,
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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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-	/*
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-	 * No arguments for this syscall, there's nothing to do.
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-	 */
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-	if (!n)
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-		return;
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-
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-	BUG_ON(i + 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 (i + n > 0)
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-			args[n] = regs->gprs[2 + i + n] & mask;
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-	if (i == 0)
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-		args[0] = regs->orig_gpr2 & mask;
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+		if (n > 0)
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+			args[n] = regs->gprs[2 + n] & mask;
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+
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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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-					 unsigned int i, unsigned int n,
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 					 const unsigned long *args)
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 {
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-	BUG_ON(i + n > 6);
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+	unsigned int n = 6;
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+
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 	while (n-- > 0)
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-		if (i + n > 0)
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-			regs->gprs[2 + i + n] = args[n];
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-	if (i == 0)
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-		regs->orig_gpr2 = args[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(void)
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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(current, TIF_31BIT))
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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;