parasite-syscall.c: introduced the macro ARCH_SI_TRAP

The macro is introduced to abstract from behavior of breakpoints:
they generate different values of the field siginfo.si_code on different architectures.
Signed-off-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

arch/x86/include/asm/parasite-syscall.h

 #ifndef __CR_ASM_PARASITE_SYSCALL_H__
 #define __CR_ASM_PARASITE_SYSCALL_H__
 
+
+#define ARCH_SI_TRAP SI_KERNEL
+
+
 extern const char code_syscall[];
 extern const int code_syscall_size;
 

parasite-syscall.c

@@ -100,7 +100,7 @@ again:
 			goto err;
 	}
 
-	if (WSTOPSIG(status) != SIGTRAP || siginfo.si_code != SI_KERNEL) {
+	if (WSTOPSIG(status) != SIGTRAP || siginfo.si_code != ARCH_SI_TRAP) {
 retry_signal:
 		pr_debug("** delivering signal %d si_code=%d\n",
 			 siginfo.si_signo, siginfo.si_code);