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-rw-r--r--arch/loongarch/kernel/syscall.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/arch/loongarch/kernel/syscall.c b/arch/loongarch/kernel/syscall.c
new file mode 100644
index 0000000000..b4c5acd7aa
--- /dev/null
+++ b/arch/loongarch/kernel/syscall.c
@@ -0,0 +1,64 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Author: Hanlu Li <lihanlu@loongson.cn>
+ * Huacai Chen <chenhuacai@loongson.cn>
+ *
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+#include <linux/capability.h>
+#include <linux/entry-common.h>
+#include <linux/errno.h>
+#include <linux/linkage.h>
+#include <linux/syscalls.h>
+#include <linux/unistd.h>
+
+#include <asm/asm.h>
+#include <asm/exception.h>
+#include <asm/signal.h>
+#include <asm/switch_to.h>
+#include <asm-generic/syscalls.h>
+
+#undef __SYSCALL
+#define __SYSCALL(nr, call) [nr] = (call),
+
+SYSCALL_DEFINE6(mmap, unsigned long, addr, unsigned long, len, unsigned long,
+ prot, unsigned long, flags, unsigned long, fd, off_t, offset)
+{
+ if (offset & ~PAGE_MASK)
+ return -EINVAL;
+
+ return ksys_mmap_pgoff(addr, len, prot, flags, fd, offset >> PAGE_SHIFT);
+}
+
+void *sys_call_table[__NR_syscalls] = {
+ [0 ... __NR_syscalls - 1] = sys_ni_syscall,
+#include <asm/unistd.h>
+};
+
+typedef long (*sys_call_fn)(unsigned long, unsigned long,
+ unsigned long, unsigned long, unsigned long, unsigned long);
+
+void noinstr do_syscall(struct pt_regs *regs)
+{
+ unsigned long nr;
+ sys_call_fn syscall_fn;
+
+ nr = regs->regs[11];
+ /* Set for syscall restarting */
+ if (nr < NR_syscalls)
+ regs->regs[0] = nr + 1;
+
+ regs->csr_era += 4;
+ regs->orig_a0 = regs->regs[4];
+ regs->regs[4] = -ENOSYS;
+
+ nr = syscall_enter_from_user_mode(regs, nr);
+
+ if (nr < NR_syscalls) {
+ syscall_fn = sys_call_table[nr];
+ regs->regs[4] = syscall_fn(regs->orig_a0, regs->regs[5], regs->regs[6],
+ regs->regs[7], regs->regs[8], regs->regs[9]);
+ }
+
+ syscall_exit_to_user_mode(regs);
+}