1 files changed, 102 insertions, 0 deletions

diff --git a/arch/um/sys-i386/shared/sysdep/stub.h b/arch/um/sys-i386/shared/sysdep/stub.h
new file mode 100644
index 000000000000..8c097b87fca7
--- /dev/null
+++ b/arch/um/sys-i386/shared/sysdep/stub.h
@@ -0,0 +1,102 @@
+/*
+ * 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/ptrace.h>
+#include <asm/unistd.h>
+#include "as-layout.h"
+#include "stub-data.h"
+#include "kern_constants.h"
+#include "uml-config.h"
+
+extern void stub_segv_handler(int sig);
+extern void stub_clone_handler(void);
+
+#define STUB_SYSCALL_RET EAX
+#define STUB_MMAP_NR __NR_mmap2
+#define MMAP_OFFSET(o) ((o) >> UM_KERN_PAGE_SHIFT)
+
+static inline long stub_syscall0(long syscall)
+{
+        long ret;
+
+        __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall));
+
+        return ret;
+}
+
+static inline long stub_syscall1(long syscall, long arg1)
+{
+        long ret;
+
+        __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1));
+
+        return ret;
+}
+
+static inline long stub_syscall2(long syscall, long arg1, long arg2)
+{
+        long ret;
+
+        __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
+                        "c" (arg2));
+
+        return ret;
+}
+
+static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3)
+{
+        long ret;
+
+        __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
+                        "c" (arg2), "d" (arg3));
+
+        return ret;
+}
+
+static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3,
+                                 long arg4)
+{
+        long ret;
+
+        __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
+                        "c" (arg2), "d" (arg3), "S" (arg4));
+
+        return ret;
+}
+
+static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3,
+                                 long arg4, long arg5)
+{
+        long ret;
+
+        __asm__ volatile ("int $0x80" : "=a" (ret) : "0" (syscall), "b" (arg1),
+                        "c" (arg2), "d" (arg3), "S" (arg4), "D" (arg5));
+
+        return ret;
+}
+
+static inline void trap_myself(void)
+{
+        __asm("int3");
+}
+
+static inline void remap_stack(int fd, unsigned long offset)
+{
+        __asm__ volatile ("movl %%eax,%%ebp ; movl %0,%%eax ; int $0x80 ;"
+                          "movl %7, %%ebx ; movl %%eax, (%%ebx)"
+                          : : "g" (STUB_MMAP_NR), "b" (STUB_DATA),
+                            "c" (UM_KERN_PAGE_SIZE),
+                            "d" (PROT_READ | PROT_WRITE),
+                            "S" (MAP_FIXED | MAP_SHARED), "D" (fd),
+                            "a" (offset),
+                            "i" (&((struct stub_data *) STUB_DATA)->err)
+                          : "memory");
+}
+
+#endif