Port a lot more code to AARCH64

- Introduce epoll_pwait()
- Rewrite -ftrapv and ffs() libraries in C code
- Use more FreeBSD code in math function library
- Get significantly more tests passing on qemu-aarch64
- Fix many Musl long double functions that were broken on AARCH64

tool/net/net.mk

@@ -54,6 +54,7 @@ TOOL_NET_DIRECTDEPS =								\
 	NET_HTTP								\
 	NET_HTTPS								\
 	THIRD_PARTY_ARGON2							\
+	THIRD_PARTY_COMPILER_RT							\
 	THIRD_PARTY_GDTOA							\
 	THIRD_PARTY_GETOPT							\
 	THIRD_PARTY_LINENOISE							\

tool/net/redbean.c

@@ -139,8 +139,10 @@
 STATIC_STACK_SIZE(0x40000);
 STATIC_YOINK("zip_uri_support");
 #if !IsTiny()
+#ifdef __x86_64__
 STATIC_YOINK("ShowCrashReportsEarly");
 #endif
+#endif
 
 /**
  * @fileoverview redbean - single-file distributable web server
@@ -171,8 +173,8 @@ STATIC_YOINK("ShowCrashReportsEarly");
 #define MONITOR_MICROS   150000
 #define READ(F, P, N)    readv(F, &(struct iovec){P, N}, 1)
 #define WRITE(F, P, N)   writev(F, &(struct iovec){P, N}, 1)
-#define LockInc(P)       asm volatile("lock incq\t%0" : "=m"(*(P)))
-#define LockDec(P)       asm volatile("lock decq\t%0" : "=m"(*(P)))
+#define LockInc(P)       (*(_Atomic(typeof(*(P))) *)(P))++
+#define LockDec(P)       (*(_Atomic(typeof(*(P))) *)(P))--
 #define AppendCrlf(P)    mempcpy(P, "\r\n", 2)
 #define HasHeader(H)     (!!cpm.msg.headers[H].a)
 #define HeaderData(H)    (inbuf.p + cpm.msg.headers[H].a)