[PATCH] uml skas0: stop gcc's insanity

With Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>

UML skas0 stub has been miscompiling for many people (incidentally not
the authors), depending on the used GCC versions.

I think (and testing on some GCC versions shows) this patch avoids the
fundamental issue which is behind this, namely gcc using the stack when
we have just replaced it, behind gcc's back.  The remapping and storage
of the return value is hidden in a blob of asm, hopefully giving gcc no
room for creativity.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 17 insertions, 13 deletions

diff --git a/arch/um/include/sysdep-x86_64/stub.h b/arch/um/include/sysdep-x86_64/stub.h
index c41689c13dc..92e989f8176 100644
--- a/arch/um/include/sysdep-x86_64/stub.h
+++ b/arch/um/include/sysdep-x86_64/stub.h
@@ -6,8 +6,12 @@
 #ifndef __SYSDEP_STUB_H
 #define __SYSDEP_STUB_H
 
+#include <sys/mman.h>
 #include <asm/unistd.h>
 #include <sysdep/ptrace_user.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);
@@ -81,23 +85,23 @@ static inline long stub_syscall5(long syscall, long arg1, long arg2, long arg3,
         return ret;
 }
 
-static inline long stub_syscall6(long syscall, long arg1, long arg2, long arg3,
-                                 long arg4, long arg5, long arg6)
+static inline void trap_myself(void)
 {
-        long ret;
-
-        __asm__ volatile ("movq %5,%%r10 ; movq %6,%%r8 ; "
-                "movq %7, %%r9; " __syscall : "=a" (ret)
-                : "0" (syscall), "D" (arg1), "S" (arg2), "d" (arg3),
-                  "g" (arg4), "g" (arg5), "g" (arg6)
-                : __syscall_clobber, "r10", "r8", "r9" );
-
-        return ret;
+        __asm("int3");
 }
 
-static inline void trap_myself(void)
+static inline void remap_stack(long fd, unsigned long offset)
 {
-        __asm("int3");
+        __asm__ volatile ("movq %4,%%r10 ; movq %5,%%r8 ; "
+                          "movq %6, %%r9; " __syscall "; movq %7, %%rbx ; "
+                          "movq %%rax, (%%rbx)": 
+                          : "a" (STUB_MMAP_NR), "D" (UML_CONFIG_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 *) UML_CONFIG_STUB_DATA)->err)
+                          : __syscall_clobber, "r10", "r8", "r9" );
 }
 
 #endif