Nintendo switch support (#8069)

* Add config section for Nintendo Switch
* Add compiler configuration for Nintendo Switch and it's CPU
* Add specific lib code for Nintendo Switch
* Add GC support for Nintendo Switch
* Update changelog for Nintendo Switch
* Update changelog with more info about fixed paths
* Cleaned up GC memory management a bit
* Relocate docs for Switch
* Rename aarch64NoneElfGcc to nintendoSwitchGCC
* Remove armv8a57
* Fix installer.ini
* Reuse code in linux and amd64
* Add posix defs for nintendo switch
* Add more defined sections for nintendo switch
* Remove old comment
* Add what's not supported for Nintendo Switch docs
* Make nintendoswitch == posix
* Remove DEVKITPRO references from nim.cfg
* Make PR extccomp changes
* Remove Result type alias
* Add separate switch consts file
* Update docs for nintendo switch
* Fix travis errors with undefined consts and add correct wait.h procs

lib/system/ansi_c.nim

@@ -45,7 +45,7 @@ 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):
+     defined(dragonfly) or defined(nintendoswitch):
   const
     SIGABRT = cint(6)
     SIGFPE = cint(8)

lib/system/dyncalls.nim

@@ -167,6 +167,24 @@ elif defined(genode):
   proc nimGetProcAddr(lib: LibHandle, name: cstring): ProcAddr {.
     error: "nimGetProcAddr not implemented".}
 
+elif defined(nintendoswitch):
+  proc nimUnloadLibrary(lib: LibHandle) =
+    stderr.rawWrite("nimUnLoadLibrary not implemented")
+    stderr.rawWrite("\n")
+    quit(1)
+
+  proc nimLoadLibrary(path: string): LibHandle =
+    stderr.rawWrite("nimLoadLibrary not implemented")
+    stderr.rawWrite("\n")
+    quit(1)
+
+
+  proc nimGetProcAddr(lib: LibHandle, name: cstring): ProcAddr =
+    stderr.rawWrite("nimGetProAddr not implemented")
+    stderr.write(name)
+    stderr.rawWrite("\n")
+    quit(1)
+
 else:
   {.error: "no implementation for dyncalls".}
 

lib/system/osalloc.nim

@@ -80,6 +80,43 @@ when defined(emscripten):
 elif defined(genode):
   include genode/alloc # osAllocPages, osTryAllocPages, osDeallocPages
 
+elif defined(nintendoswitch):
+  import nintendoswitch/switch_memory
+
+  var
+    stack: pointer
+
+  proc alignSize(size: int): int =
+    (size + 0x00000FFF) and not 0x00000FFF
+
+  proc freeMem(p: pointer, msize: int) =
+    let size = alignSize(msize)
+    discard svcUnmapMemory(p, stack, size.uint64)
+    virtmemFreeMap(p, size.csize)
+    free(stack)
+
+  proc osAllocPages(msize: int): pointer {.inline.} =
+    let size = alignSize(msize)
+    stack = memalign(0x1000, size)
+    result = virtmemReserveMap(size.csize)
+    let rc = svcMapMemory(result, stack, size.uint64)
+    if rc.uint32 != 0:
+      freeMem(result, size)
+      raiseOutOfMem()
+
+  proc osTryAllocPages(msize: int): pointer {.inline.} =
+    let size = alignSize(msize)
+    stack = memalign(0x1000, size)
+    result = virtmemReserveMap(size.csize)
+    let rc = svcMapMemory(result, stack, size.uint64)
+    if rc.uint32 != 0:
+      freeMem(result, size)
+      result = nil
+
+  proc osDeallocPages(p: pointer, size: int) {.inline.} =
+    when reallyOsDealloc:
+      freeMem(p, size)
+
 elif defined(posix):
   const
     PROT_READ  = 1             # page can be read

lib/system/platforms.nim

@@ -37,7 +37,7 @@ type
     none, dos, windows, os2, linux, morphos, skyos, solaris,
     irix, netbsd, freebsd, openbsd, aix, palmos, qnx, amiga,
     atari, netware, macos, macosx, haiku, android, js, nimVM,
-    standalone
+    standalone, nintendoswitch
 
 const
   targetOS* = when defined(windows): OsPlatform.windows
@@ -64,6 +64,7 @@ const
               elif defined(js): OsPlatform.js
               elif defined(nimVM): OsPlatform.nimVM
               elif defined(standalone): OsPlatform.standalone
+              elif defined(nintendoswitch): OsPlatform.nintendoswitch
               else: OsPlatform.none
     ## the OS this program will run on.
 

lib/system/sysio.nim

@@ -419,7 +419,7 @@ proc setStdIoUnbuffered() =
 when declared(stdout):
   proc echoBinSafe(args: openArray[string]) {.compilerProc.} =
     # flockfile deadlocks some versions of Android 5.x.x
-    when not defined(windows) and not defined(android):
+    when not defined(windows) and not defined(android) and not defined(nintendoswitch):
       proc flockfile(f: File) {.importc, noDecl.}
       proc funlockfile(f: File) {.importc, noDecl.}
       flockfile(stdout)
@@ -428,7 +428,7 @@ when declared(stdout):
     const linefeed = "\n" # can be 1 or more chars
     discard c_fwrite(linefeed.cstring, linefeed.len, 1, stdout)
     discard c_fflush(stdout)
-    when not defined(windows) and not defined(android):
+    when not defined(windows) and not defined(android) and not defined(nintendoswitch):
       funlockfile(stdout)
 
 {.pop.}

lib/system/threads.nim

@@ -176,7 +176,7 @@ else:
     else:
       type Time = int
 
-  when defined(linux) and defined(amd64):
+  when (defined(linux) or defined(nintendoswitch)) and defined(amd64):
     type
       SysThread* {.importc: "pthread_t",
                   header: "<sys/types.h>" .} = distinct culong