Make considerably more progress on AARCH64

- Utilities like pledge.com now build
- kprintf() will no longer balk at 48-bit addresses
- There's a new aarch64-dbg build mode that should work
- gc() and defer() are mostly pacified; avoid using them on aarch64
- THIRD_PART_STB now has Arm Neon intrinsics for fast image handling

libc/nexgen32e/checkstackalign.S

@@ -22,6 +22,8 @@
 //
 //	This function crashes if called with a misaligned stack.
 CheckStackIsAligned:
+#ifdef __x86_64__
+
 	push	%rbp
 	mov	%rsp,%rbp
 
@@ -35,4 +37,14 @@ CheckStackIsAligned:
 
 	leave
 	ret
+
+#elif defined(__aarch64__)
+
+//	TODO: support me
+	mov	x0,#1
+	ret
+
+#else
+#error "unsupported architecture"
+#endif
 	.endfn	CheckStackIsAligned,globl

libc/nexgen32e/gclongjmp.S

@@ -31,6 +31,7 @@
 //	@threadsafe
 //	@noreturn
 _gclongjmp:
+#ifdef __x86_64__
 	push	%rbp
 	mov	%rsp,%rbp
 	.profilable
@@ -59,4 +60,9 @@ _gclongjmp:
 2:	pop	%rsi
 	pop	%rdi
 	jmp	0b
+#elif defined(__aarch64__)
+	b	longjmp
+#else
+#error "unsupported architecture"
+#endif /* __x86_64__ */
 	.endfn	_gclongjmp,globl

libc/nexgen32e/mcount.S

@@ -17,10 +17,10 @@
 │ PERFORMANCE OF THIS SOFTWARE.                                                │
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/macros.internal.h"
-.real
 
 //	Function Profiling Hook.
 //	cc -pg adds this to the start of global functions.
 mcount:	ret
-	.endfn	mcount,weak
+	.endfn	mcount,globl,weak
+	.alias	mcount,_mcount		// aarch64 weirdness?
 	.alias	mcount,.mcount		// freebsd weirdness?

libc/nexgen32e/nexgen32e.mk

@@ -42,10 +42,22 @@ $(LIBC_NEXGEN32E_A).pkg:				\
 		$(LIBC_NEXGEN32E_A_OBJS)		\
 		$(foreach x,$(LIBC_NEXGEN32E_A_DIRECTDEPS),$($(x)_A).pkg)
 
+o/$(MODE)/libc/nexgen32e/argc2.o			\
+o/$(MODE)/libc/nexgen32e/argv2.o			\
+o/$(MODE)/libc/nexgen32e/auxv2.o			\
+o/$(MODE)/libc/nexgen32e/cescapec.o			\
+o/$(MODE)/libc/nexgen32e/crc32init.o			\
+o/$(MODE)/libc/nexgen32e/environ2.o			\
+o/$(MODE)/libc/nexgen32e/envp2.o			\
+o/$(MODE)/libc/nexgen32e/kbase36.o			\
+o/$(MODE)/libc/nexgen32e/ktens.o			\
+o/$(MODE)/libc/nexgen32e/ktolower.o			\
+o/$(MODE)/libc/nexgen32e/ktoupper.o			\
+o/$(MODE)/libc/nexgen32e/pid.o				\
+o/$(MODE)/libc/nexgen32e/program_invocation_name2.o	\
 o/$(MODE)/libc/nexgen32e/threaded.o: private		\
 		OVERRIDE_CFLAGS +=			\
-			$(NO_MAGIC)			\
-			-fno-sanitize=all
+			$(NO_MAGIC)
 
 # these assembly files are safe to build on aarch64
 o/$(MODE)/libc/nexgen32e/zip.o: libc/nexgen32e/zip.S
@@ -70,6 +82,10 @@ o/$(MODE)/libc/nexgen32e/missingno.o: libc/nexgen32e/missingno.S
 	@$(COMPILE) -AOBJECTIFY.S $(OBJECTIFY.S) $(OUTPUT_OPTION) -c $<
 o/$(MODE)/libc/nexgen32e/khalfcache3.o: libc/nexgen32e/khalfcache3.S
 	@$(COMPILE) -AOBJECTIFY.S $(OBJECTIFY.S) $(OUTPUT_OPTION) -c $<
+o/$(MODE)/libc/nexgen32e/gclongjmp.o: libc/nexgen32e/gclongjmp.S
+	@$(COMPILE) -AOBJECTIFY.S $(OBJECTIFY.S) $(OUTPUT_OPTION) -c $<
+o/$(MODE)/libc/nexgen32e/checkstackalign.o: libc/nexgen32e/checkstackalign.S
+	@$(COMPILE) -AOBJECTIFY.S $(OBJECTIFY.S) $(OUTPUT_OPTION) -c $<
 
 LIBC_NEXGEN32E_LIBS = $(foreach x,$(LIBC_NEXGEN32E_ARTIFACTS),$($(x)))
 LIBC_NEXGEN32E_SRCS = $(foreach x,$(LIBC_NEXGEN32E_ARTIFACTS),$($(x)_SRCS))

libc/nexgen32e/program_invocation_name2.c

@@ -18,4 +18,8 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/runtime/runtime.h"
 
+#ifndef __x86_64__
+
 char *program_invocation_name;
+
+#endif /* __x86_64__ */