1 files changed, 107 insertions, 0 deletions

diff --git a/arch/um/sys-x86_64/shared/sysdep/stub.h b/arch/um/sys-x86_64/shared/sysdep/stub.h
new file mode 100644
index 00000000000..3432aa24997
--- /dev/null
+++ b/arch/um/sys-x86_64/shared/sysdep/stub.h
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __SYSDEP_STUB_H
+#define __SYSDEP_STUB_H
+
+#include <sys/mman.h>
+#include <asm/unistd.h>
+#include <sysdep/ptrace_user.h>
+#include "as-layout.h"
+#include "stub-data.h"
+#include "kern_constants.h"
+
+extern void stub_segv_handler(int sig);
+extern void stub_clone_handler(void);
+
+#define STUB_SYSCALL_RET PT_INDEX(RAX)
+#define STUB_MMAP_NR __NR_mmap
+#define MMAP_OFFSET(o) (o)
+
+#define __syscall_clobber "r11","rcx","memory"
+#define __syscall "syscall"
+
+static inline long stub_syscall0(long syscall)
+{
+        long ret;
+
+        __asm__ volatile (__syscall
+                : "=a" (ret)
+                : "0" (syscall) : __syscall_clobber );
+
+        return ret;
+}
+
+static inline long stub_syscall2(long syscall, long arg1, long arg2)
+{
+        long ret;
+
+        __asm__ volatile (__syscall
+                : "=a" (ret)
+                : "0" (syscall), "D" (arg1), "S" (arg2) : __syscall_clobber );
+
+        return ret;
+}
+
+static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3)
+{
+        long ret;
+
+        __asm__ volatile (__syscall
+                : "=a" (ret)
+                : "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3)
+                : __syscall_clobber );
+
+        return ret;
+}
+
+static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3,
+                                 long arg4)
+{
+        long ret;
+
+        __asm__ volatile ("movq %5,%%r10 ; " __syscall
+                : "=a" (ret)
+                : "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3),
+                  "g" (arg4)
+                : __syscall_clobber, "r10" );
+
+        return ret;
+}
+
+static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3,
+                                 long arg4, long arg5)
+{
+        long ret;
+
+        __asm__ volatile ("movq %5,%%r10 ; movq %6,%%r8 ; " __syscall
+                : "=a" (ret)
+                : "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3),
+                  "g" (arg4), "g" (arg5)
+                : __syscall_clobber, "r10", "r8" );
+
+        return ret;
+}
+
+static inline void trap_myself(void)
+{
+        __asm("int3");
+}
+
+static inline void remap_stack(long fd, unsigned long offset)
+{
+        __asm__ volatile ("movq %4,%%r10 ; movq %5,%%r8 ; "
+                          "movq %6, %%r9; " __syscall "; movq %7, %%rbx ; "
+                          "movq %%rax, (%%rbx)":
+                          : "a" (STUB_MMAP_NR), "D" (STUB_DATA),
+                            "S" (UM_KERN_PAGE_SIZE),
+                            "d" (PROT_READ | PROT_WRITE),
+                            "g" (MAP_FIXED | MAP_SHARED), "g" (fd),
+                            "g" (offset),
+                            "i" (&((struct stub_data *) STUB_DATA)->err)
+                          : __syscall_clobber, "r10", "r8", "r9" );
+}
+
+#endif