1 files changed, 122 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/syscall.h b/arch/powerpc/include/asm/syscall.h
new file mode 100644
index 000000000..3dd36c5e3
--- /dev/null
+++ b/arch/powerpc/include/asm/syscall.h
@@ -0,0 +1,122 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Access to user system call parameters and results
+ *
+ * Copyright (C) 2008 Red Hat, Inc.  All rights reserved.
+ *
+ * See asm-generic/syscall.h for descriptions of what we must do here.
+ */
+
+#ifndef _ASM_SYSCALL_H
+#define _ASM_SYSCALL_H	1
+
+#include <uapi/linux/audit.h>
+#include <linux/sched.h>
+#include <linux/thread_info.h>
+
+#ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
+typedef long (*syscall_fn)(const struct pt_regs *);
+#else
+typedef long (*syscall_fn)(unsigned long, unsigned long, unsigned long,
+			   unsigned long, unsigned long, unsigned long);
+#endif
+
+/* ftrace syscalls requires exporting the sys_call_table */
+extern const syscall_fn sys_call_table[];
+extern const syscall_fn compat_sys_call_table[];
+
+static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
+{
+	/*
+	 * Note that we are returning an int here. That means 0xffffffff, ie.
+	 * 32-bit negative 1, will be interpreted as -1 on a 64-bit kernel.
+	 * This is important for seccomp so that compat tasks can set r0 = -1
+	 * to reject the syscall.
+	 */
+	if (trap_is_syscall(regs))
+		return regs->gpr[0];
+	else
+		return -1;
+}
+
+static inline void syscall_rollback(struct task_struct *task,
+				    struct pt_regs *regs)
+{
+	regs->gpr[3] = regs->orig_gpr3;
+}
+
+static inline long syscall_get_error(struct task_struct *task,
+				     struct pt_regs *regs)
+{
+	if (trap_is_scv(regs)) {
+		unsigned long error = regs->gpr[3];
+
+		return IS_ERR_VALUE(error) ? error : 0;
+	} else {
+		/*
+		 * If the system call failed,
+		 * regs->gpr[3] contains a positive ERRORCODE.
+		 */
+		return (regs->ccr & 0x10000000UL) ? -regs->gpr[3] : 0;
+	}
+}
+
+static inline long syscall_get_return_value(struct task_struct *task,
+					    struct pt_regs *regs)
+{
+	return regs->gpr[3];
+}
+
+static inline void syscall_set_return_value(struct task_struct *task,
+					    struct pt_regs *regs,
+					    int error, long val)
+{
+	if (trap_is_scv(regs)) {
+		regs->gpr[3] = (long) error ?: val;
+	} else {
+		/*
+		 * In the general case it's not obvious that we must deal with
+		 * CCR here, as the syscall exit path will also do that for us.
+		 * However there are some places, eg. the signal code, which
+		 * check ccr to decide if the value in r3 is actually an error.
+		 */
+		if (error) {
+			regs->ccr |= 0x10000000L;
+			regs->gpr[3] = error;
+		} else {
+			regs->ccr &= ~0x10000000L;
+			regs->gpr[3] = val;
+		}
+	}
+}
+
+static inline void syscall_get_arguments(struct task_struct *task,
+					 struct pt_regs *regs,
+					 unsigned long *args)
+{
+	unsigned long val, mask = -1UL;
+	unsigned int n = 6;
+
+	if (is_tsk_32bit_task(task))
+		mask = 0xffffffff;
+
+	while (n--) {
+		if (n == 0)
+			val = regs->orig_gpr3;
+		else
+			val = regs->gpr[3 + n];
+
+		args[n] = val & mask;
+	}
+}
+
+static inline int syscall_get_arch(struct task_struct *task)
+{
+	if (is_tsk_32bit_task(task))
+		return AUDIT_ARCH_PPC;
+	else if (IS_ENABLED(CONFIG_CPU_LITTLE_ENDIAN))
+		return AUDIT_ARCH_PPC64LE;
+	else
+		return AUDIT_ARCH_PPC64;
+}
+#endif	/* _ASM_SYSCALL_H */