libc: aarch64 setjmp, untested

base/usr/include/setjmp.h

@@ -5,7 +5,11 @@
 _Begin_C_Header
 
 /* i386 */
+#ifdef __aarch64__
+#define _JBLEN 32
+#else
 #define _JBLEN 9
+#endif
 
 typedef long long jmp_buf[_JBLEN];
 

libc/arch/aarch64/setjmp.c

@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <setjmp.h>
+
+asm (
+	".globl setjmp\n"
+	"setjmp:\n"
+	"mov x2, sp\n"
+	"stp x2, x29,  [x0]\n"
+	"stp x30, x1,  [x0, (1 * 16)]\n"
+	"stp x19, x20, [x0, (2 * 16)]\n"
+	"stp x21, x22, [x0, (3 * 16)]\n"
+	"stp x23, x24, [x0, (4 * 16)]\n"
+	"stp x25, x26, [x0, (5 * 16)]\n"
+	"stp x27, x28, [x0, (6 * 16)]\n"
+	"mov x0, 0\n"
+	"ret\n"
+	".globl longjmp\n"
+	"longjmp:\n"
+	"ldp x2, x29,  [x0]\n"
+	"ldp x30, x1,  [x0, (1 * 16)]\n"
+	"ldp x19, x20, [x0, (2 * 16)]\n"
+	"ldp x21, x22, [x0, (3 * 16)]\n"
+	"ldp x23, x24, [x0, (4 * 16)]\n"
+	"ldp x25, x26, [x0, (5 * 16)]\n"
+	"ldp x27, x28, [x0, (6 * 16)]\n"
+	"mov sp, x2\n"
+	"mov x0, 1\n"
+	"ret\n"
+);
+
+#if 0
+int _setjmp(jmp_buf env);
+void _longjmp(jmp_buf env, int val);
+
+int setjmp(jmp_buf env) {
+	fprintf(stderr, "setjmp called\n");
+	return _setjmp(env);
+}
+void longjmp(jmp_buf env, int val) {
+	fprintf(stderr, "longjmp called\n");
+	_longjmp(env,val);
+}
+#endif