restorer: wrapped the assembly code executed on a rt_sigreturn failure into the…

restorer: wrapped the assembly code executed on a rt_sigreturn failure into the macro ARCH_FAIL_CORE_RESTORE.
Signed-off-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

arch/x86/include/asm/restorer.h

@@ -120,6 +120,15 @@ struct rt_sigframe {
 		       "g"(&thread_args[i])				\
 		     : "rax", "rdi", "rsi", "rdx", "r10", "memory")
 
+#define ARCH_FAIL_CORE_RESTORE					\
+	asm volatile(						\
+		     "movq %0, %%rsp			    \n"	\
+		     "movq 0, %%rax			    \n"	\
+		     "jmp *%%rax			    \n"	\
+		     :						\
+		     : "r"(ret)					\
+		     : "memory")
+
 
 int restore_gpregs(struct rt_sigframe *f, UserX86RegsEntry *r);
 

pie/restorer.c

@@ -715,12 +715,7 @@ core_restore_end:
 	return -1;
 
 core_restore_failed:
-	asm volatile(
-		"movq %0, %%rsp				\n"
-		"movq 0, %%rax				\n"
-		"jmp *%%rax				\n"
-		:
-		: "r"(ret)
-		: "memory");
+	ARCH_FAIL_CORE_RESTORE;
+
 	return ret;
 }