libc: separate x64-specific code and provide aarch64 stubs

Signed-off-by: Claudio Fontana <claudio.fontana@huawei.com>
Signed-off-by: Pekka Enberg <penberg@cloudius-systems.com>

include/api/aarch64/bits/setjmp.h

-typedef unsigned long jmp_buf[8];
+typedef unsigned long __jmp_buf[8];

libc/arch/aarch64/setjmp/block.c

+/* Copyright 2014 Huawei Technologies Duesseldorf GmbH
+ *
+ * This work is open source software, licensed under the terms of the
+ * BSD license as described in the LICENSE file in the top-level directory.
+ */
+
+#include "syscall.h"
+#include <signal.h>
+
+static const unsigned long all_mask[] = { -1UL };
+
+static const unsigned long app_mask[] = {
+	0xfffffffc7fffffffUL
+};
+
+void __block_all_sigs(void *set)
+{
+    sigprocmask(SIG_BLOCK, (void*)&all_mask, set);
+}
+
+void __block_app_sigs(void *set)
+{
+    sigprocmask(SIG_BLOCK, (void*)&app_mask, set);
+}
+
+void __restore_sigs(void *set)
+{
+    sigprocmask(SIG_SETMASK, set, 0);
+}

libc/arch/aarch64/setjmp/siglongjmp.c

+/* Copyright 2014 Huawei Technologies Duesseldorf GmbH
+ *
+ * This work is open source software, licensed under the terms of the
+ * BSD license as described in the LICENSE file in the top-level directory.
+ */
+
+#include <setjmp.h>
+
+extern void __restore_sigs(void *set);
+
+_Noreturn void siglongjmp(sigjmp_buf buf, int ret)
+{
+    while (1) {
+        asm volatile ("wfi");
+    }
+}

libc/arch/aarch64/setjmp/sigrtmax.c

+int __libc_current_sigrtmax()
+{
+    return 0; /* XXX */
+}

libc/arch/aarch64/setjmp/sigrtmin.c

+int __libc_current_sigrtmin()
+{
+    return 0; /* XXX */
+}

libc/arch/aarch64/setjmp/sigsetjmp.s

+/* Copyright 2014 Huawei Technologies Duesseldorf GmbH
+ *
+ * This work is open source software, licensed under the terms of the
+ * BSD license as described in the LICENSE file in the top-level directory.
+ */
+
+.global _sigsetjmp
+.global sigsetjmp
+.type _sigsetjmp,@function
+.type sigsetjmp,@function
+_sigsetjmp:
+sigsetjmp:
+        wfi
+        b sigsetjmp

libc/build.mk

@@ -382,12 +382,11 @@ libc += prng/random.o
 
 libc += arch/$(arch)/setjmp/setjmp.o
 libc += arch/$(arch)/setjmp/longjmp.o
-
-libc += signal/sigrtmax.o
-libc += signal/sigrtmin.o
-libc += signal/siglongjmp.o
-libc += signal/sigsetjmp.o
-libc += signal/block.o
+libc += arch/$(arch)/setjmp/sigrtmax.o
+libc += arch/$(arch)/setjmp/sigrtmin.o
+libc += arch/$(arch)/setjmp/siglongjmp.o
+libc += arch/$(arch)/setjmp/sigsetjmp.o
+libc += arch/$(arch)/setjmp/block.o
 
 libc += stdio/__fclose_ca.o
 libc += stdio/__fdopen.o