patacongo commented on a change in pull request #3626:
URL: https://github.com/apache/incubator-nuttx/pull/3626#discussion_r638228182



##########
File path: arch/arm/src/armv8-m/svcall.h
##########
@@ -122,6 +115,17 @@
 #define SYS_signal_handler_return (7)
 
 #endif /* CONFIG_BUILD_PROTECTED */
+
+/* SYS call 5:
+ *
+ * void up_pthread_start(pthread_startroutine_t startup,
+ *                       pthread_startroutine_t entrypt, pthread_addr_t arg)
+ *        noreturn_function
+ */
+
+#define SYS_pthread_start         (5)

Review comment:
       > where SYS_pthread_exit
   
   It is a normal system call.  SYS_pthread_start is not.  The start function 
is an internal chip-specific OS interface, SYS_nx_pthread_exit, is part of the 
common, normal user interface and you will find it in nuttx/syscall.




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