1 files changed, 47 insertions, 0 deletions

diff --git a/arch/um/include/sysdep-i386/stub.h b/arch/um/include/sysdep-i386/stub.h
index fed9ff1cea52..d3699fe1c613 100644
--- a/arch/um/include/sysdep-i386/stub.h
+++ b/arch/um/include/sysdep-i386/stub.h
@@ -10,9 +10,56 @@
 #include <asm/unistd.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) >> PAGE_SHIFT)
 
+static inline long stub_syscall2(long syscall, long arg1, long arg2)
+{
+        long ret;
+
+        __asm__("movl %0, %%ecx; " : : "g" (arg2) : "%ecx");
+        __asm__("movl %0, %%ebx; " : : "g" (arg1) : "%ebx");
+        __asm__("movl %0, %%eax; " : : "g" (syscall) : "%eax");
+        __asm__("int $0x80;" : : : "%eax");
+        __asm__ __volatile__("movl %%eax, %0; " : "=g" (ret) :);
+        return(ret);
+}
+
+static inline long stub_syscall3(long syscall, long arg1, long arg2, long arg3)
+{
+        __asm__("movl %0, %%edx; " : : "g" (arg3) : "%edx");
+        return(stub_syscall2(syscall, arg1, arg2));
+}
+
+static inline long stub_syscall4(long syscall, long arg1, long arg2, long arg3,
+                                 long arg4)
+{
+        __asm__("movl %0, %%esi; " : : "g" (arg4) : "%esi");
+        return(stub_syscall3(syscall, arg1, arg2, arg3));
+}
+
+static inline long stub_syscall6(long syscall, long arg1, long arg2, long arg3,
+                                 long arg4, long arg5, long arg6)
+{
+        long ret;
+        __asm__("movl %0, %%eax; " : : "g" (syscall) : "%eax");
+        __asm__("movl %0, %%ebx; " : : "g" (arg1) : "%ebx");
+        __asm__("movl %0, %%ecx; " : : "g" (arg2) : "%ecx");
+        __asm__("movl %0, %%edx; " : : "g" (arg3) : "%edx");
+        __asm__("movl %0, %%esi; " : : "g" (arg4) : "%esi");
+        __asm__("movl %0, %%edi; " : : "g" (arg5) : "%edi");
+        __asm__ __volatile__("pushl %%ebp ; movl %1, %%ebp; "
+                "int $0x80; popl %%ebp ; "
+                "movl %%eax, %0; " : "=g" (ret) : "g" (arg6) : "%eax");
+        return(ret);
+}
+
+static inline void trap_myself(void)
+{
+        __asm("int3");
+}
+
 #endif