Genode fixes (#8501)

* Genode fixes

- wrap strings in "Genode::Cstring" when logging
- define SIGABRT for Genode
- disable GCC -fstack-protector
- use log RPC for fatal messages
- add --os:genode build to appveyor
- define paramStr and paramCount

* Select fixups for Genode POSIX

lib/nimbase.h

@@ -129,13 +129,13 @@ __clang__
        defined __DMC__ || \
        defined __BORLANDC__ )
 #  define NIM_THREADVAR __declspec(thread)
+#elif defined(__TINYC__) || defined(__GENODE__)
+#  define NIM_THREADVAR
 /* note that ICC (linux) and Clang are covered by __GNUC__ */
 #elif defined __GNUC__ || \
        defined __SUNPRO_C || \
        defined __xlC__
 #  define NIM_THREADVAR __thread
-#elif defined __TINYC__
-#  define NIM_THREADVAR
 #else
 #  error "Cannot define NIM_THREADVAR"
 #endif

lib/pure/ioselects/ioselectors_select.nim

@@ -310,7 +310,10 @@ proc selectInto*[T](s: Selector[T], timeout: int,
   var rset, wset, eset: FdSet
 
   if timeout != -1:
-    tv.tv_sec = timeout.int32 div 1_000
+    when defined(genode):
+      tv.tv_sec = Time(timeout div 1_000)
+    else:
+      tv.tv_sec = timeout.int32 div 1_000
     tv.tv_usec = (timeout.int32 %% 1_000) * 1_000
   else:
     ptv = nil
@@ -391,7 +394,6 @@ proc contains*[T](s: Selector[T], fd: SocketHandle|int): bool {.inline.} =
     for i in 0..<FD_SETSIZE:
       if s.fds[i].ident == fdi:
         return true
-      inc(i)
 
 when hasThreadSupport:
   template withSelectLock[T](s: Selector[T], body: untyped) =

lib/pure/os.nim

@@ -1363,9 +1363,15 @@ elif defined(nintendoswitch):
   proc paramCount*(): int {.tags: [ReadIOEffect].} =
     raise newException(OSError, "paramCount is not implemented on Nintendo Switch")
 
+elif defined(genode):
+  proc paramStr*(i: int): TaintedString =
+    raise newException(OSError, "paramStr is not implemented on Genode")
+
+  proc paramCount*(): int =
+    raise newException(OSError, "paramCount is not implemented on Genode")
+
 elif not defined(createNimRtl) and
-  not(defined(posix) and appType == "lib") and
-  not defined(genode):
+  not(defined(posix) and appType == "lib"):
   # On Posix, there is no portable way to get the command line from a DLL.
   var
     cmdCount {.importc: "cmdCount".}: cint

lib/system.nim

@@ -4152,8 +4152,13 @@ when defined(cpp) and appType != "lib" and
 
     let ex = getCurrentException()
     let trace = ex.getStackTrace()
-    stderr.write trace & "Error: unhandled exception: " & ex.msg &
-                 " [" & $ex.name & "]\n"
+    when defined(genode):
+      # stderr not available by default, use the LOG session
+      echo trace & "Error: unhandled exception: " & ex.msg &
+                   " [" & $ex.name & "]\n"
+    else:
+      stderr.write trace & "Error: unhandled exception: " & ex.msg &
+                   " [" & $ex.name & "]\n"
     quit 1
 
 when not defined(js):

lib/system/ansi_c.nim

@@ -50,7 +50,7 @@ when defined(windows):
     SIGTERM = cint(15)
 elif defined(macosx) or defined(linux) or defined(freebsd) or
      defined(openbsd) or defined(netbsd) or defined(solaris) or
-     defined(dragonfly) or defined(nintendoswitch):
+     defined(dragonfly) or defined(nintendoswitch) or defined(genode):
   const
     SIGABRT = cint(6)
     SIGFPE = cint(8)

lib/system/excpt.nim

@@ -31,7 +31,11 @@ proc showErrorMessage(data: cstring) {.gcsafe.} =
   if errorMessageWriter != nil:
     errorMessageWriter($data)
   else:
-    writeToStdErr(data)
+    when defined(genode):
+      # stderr not available by default, use the LOG session
+      echo data
+    else:
+      writeToStdErr(data)
 
 proc quitOrDebug() {.inline.} =
   when not defined(endb):