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/sysv/calls/sys_access.S

@@ -1,2 +0,0 @@
-#include "libc/sysv/macros.internal.h"
-.scall sys_access,0x0210210212021015,0xfff,globl,hidden

libc/sysv/consts/nrlinux.h

@@ -360,6 +360,7 @@
 #define __NR_linux_stat                    0x004f
 #define __NR_linux_fstat                   0x0050
 #define __NR_linux_ppoll                   0x0049
+#define __NR_linux_brk                     0x00d6
 #define __NR_linux_sigreturn               0x008b
 #define __NR_linux_lseek                   0x003e
 #define __NR_linux_mmap                    0x00de

libc/sysv/errfun.S

@@ -33,6 +33,7 @@ __errfun:
 	str	w19,[x0]
 	mov	x0,#-1
 	ldp	x19,x30,[sp],#16
+	ret
 #else
 #error "unsupported architecture"
 #endif

libc/sysv/errno.c

@@ -18,11 +18,6 @@
 ╚─────────────────────────────────────────────────────────────────────────────*/
 #include "libc/errno.h"
 
-asm(".weak\t__asan_init");
-asm(".weak\t__asan_register_globals");
-asm(".weak\t__asan_unregister_globals");
-asm(".weak\t__asan_version_mismatch_check_v8");
-
 /**
  * Global variable for last error.
  *

libc/sysv/syscalls.sh

@@ -56,7 +56,6 @@ scall	sys_pread		0x8ad8ad9db2899811	0x043	globl hidden # a.k.a. pread64; netbsd+
 scall	sys_pwrite		0x8ae8ae9dc289a812	0x044	globl hidden # a.k.a. pwrite64; netbsd+openbsd:pad
 scall	sys_readv		0x8788788782878813	0x041	globl hidden
 scall	sys_writev		0x8798798792879814	0x042	globl hidden
-scall	sys_access		0x0210210212021015	0xfff	globl hidden
 scall	__sys_pipe		0x02a10721e202a016	0x03b	globl hidden # NOTE: pipe2() on FreeBSD and Linux Aarch64; XNU is pipe(void)→eax:edx
 scall	sys_select		0x9a184785d285d817	0xfff	globl hidden
 scall	sys_pselect		0x9b486ea0a298a90e	0x048	globl hidden # pselect6() on gnu/systemd

libc/sysv/syscount.S

@@ -24,6 +24,7 @@
 //	for the purpose of counting non-Windows system calls. Please
 //	note wrappers may still short circuit calls sometimes, which
 //	wouldn't impact this counter.
+
 	.bss
 	.balign	8
 __syscount:
@@ -31,6 +32,8 @@ __syscount:
 	.endobj	__syscount,globl
 	.previous
 
+#ifdef __x86_64__
+
 	.initbss 701,_init___syscount
 __syscount_next:
 	.quad	0
@@ -49,3 +52,5 @@ syscount:
 	ezlea	syscount,ax
 	mov	%rax,__systemfive(%rip)
 	.init.end 701,_init___syscount
+
+#endif /* __x86_64__ */

libc/sysv/sysv.mk

@@ -70,6 +70,11 @@ $(LIBC_SYSV_A).pkg:					\
 		$(LIBC_SYSV_A_OBJS)			\
 		$(foreach x,$(LIBC_SYSV_A_DIRECTDEPS),$($(x)_A).pkg)
 
+o/$(MODE)/libc/sysv/errno.o				\
+o/$(MODE)/libc/sysv/sysret.o: private			\
+		OVERRIDE_CFLAGS +=			\
+			$(NO_MAGIC)
+
 #───────────────────────────────────────────────────────────────────────────────
 
 LIBC_SYSV_CALLS =					\
@@ -129,6 +134,8 @@ $(LIBC_SYSV_MACHCALLS_A).pkg:				\
 # let aarch64 compile these
 o/$(MODE)/libc/sysv/errfun.o: libc/sysv/errfun.S
 	@$(COMPILE) -AOBJECTIFY.S $(OBJECTIFY.S) $(OUTPUT_OPTION) $<
+o/$(MODE)/libc/sysv/syscount.o: libc/sysv/syscount.S
+	@$(COMPILE) -AOBJECTIFY.S $(OBJECTIFY.S) $(OUTPUT_OPTION) $<
 o/$(MODE)/libc/sysv/restorert.o: libc/sysv/restorert.S
 	@$(COMPILE) -AOBJECTIFY.S $(OBJECTIFY.S) $(OUTPUT_OPTION) $<
 o/$(MODE)/libc/sysv/calls/%.o: libc/sysv/calls/%.S