* defs.h, syscall.c: explain why x86 does not need TCB_WAITEXECVE trick,
and what syscall_fixup() is expected to do. Comments only, no code changes.
diff --git a/defs.h b/defs.h
index 4d4a78c..e3cd93d 100644
--- a/defs.h
+++ b/defs.h
@@ -360,6 +360,10 @@
#define TCB_FOLLOWFORK 00400 /* Process should have forks followed */
#define TCB_REPRINT 01000 /* We should reprint this syscall on exit */
#ifdef LINUX
+/* x86 does not need TCB_WAITEXECVE.
+ * It can detect execve's SIGTRAP by looking at eax/rax.
+ * See "stray syscall exit: eax = " message in syscall_fixup().
+ */
# if defined(ALPHA) || defined(SPARC) || defined(SPARC64) || defined(POWERPC) || defined(IA64) || defined(HPPA) || defined(SH) || defined(SH64) || defined(S390) || defined(S390X) || defined(ARM) || defined(MIPS) || defined(BFIN)
# define TCB_WAITEXECVE 02000 /* ignore SIGTRAP after exceve */
# endif