Get aarch64 hello world working

$ m=aarch64-tiny
    $ make -j8 m=$m o/$m/tool/hello/hello.com o/third_party/qemu/qemu-aarch64
    $ o/third_party/qemu/qemu-aarch64 o/$m/tool/hello/hello.com
    hello world
    $ ls -hal o/$m/tool/hello/hello.com
    -rwxr-xr-x 1 jart jart 4.0K May  9 05:04 o/aarch64-tiny/tool/hello/hello.com

tool/build/calculator.inc

@@ -60,7 +60,6 @@ M(1, g, "expm1", Expm1, expm1l(x), "𝑒ˣ-1")
 M(1, g, "exp2", Exp2, exp2l(x), "2ˣ")
 M(1, g, "exp10", Exp10, exp10l(x), "10ˣ")
 M(2, g, "ldexp", Ldexp, ldexpl(x, y), "𝑥×2ʸ")
-M(2, g, "scalb", Scalb, scalbl(x, y), "𝑥×2ʸ")
 
 M(1, f, "log", Log, logl(x), "logₑ𝑥")
 M(1, g, "log2", Log2, log2l(x), "log₂𝑥")

tool/emacs/cosmo-stuff.el

@@ -147,8 +147,8 @@
 ;;   M-3 C-c C-c   Compile w/ MODE=rel
 ;;   M-4 C-c C-c   Compile w/ MODE=dbg
 ;;   M-5 C-c C-c   Compile w/ MODE=""
-;;   M-7 C-c C-c   Compile w/ MODE=tinylinux
-;;   M-8 C-c C-c   Compile w/ clang tsan
+;;   M-7 C-c C-c   Compile w/ MODE=aarch64
+;;   M-8 C-c C-c   Compile w/ MODE=aarch64-tiny
 ;;   M-9 C-c C-c   Compile w/ chibicc
 
 (defun cosmo-intest (&optional file-name)
@@ -166,7 +166,7 @@
         ((eq arg 5) "")
         ((eq arg 6) "llvm")
         ((eq arg 7) "aarch64")
-        ((eq arg 8) "tsan")
+        ((eq arg 8) "aarch64-tiny")
         (default default)
         ((cosmo-intest) "dbg")
         (t "fastbuild")))
@@ -233,13 +233,13 @@
              " && "
              `("m=%s; f=o/$m/%s.com"
                ,(concat "make -j12 $f MODE=$m")
-               "./$f"))
+               "build/run ./$f"))
             mode name))
           ((eq kind 'test)
            (format `"m=%s; f=o/$m/%s.com.ok && make -j12 $f MODE=$m" mode name))
           ((and (file-regular-p this)
                 (file-executable-p this))
-           (format "./%s" file))
+           (format "build/run ./%s" file))
           ('t
            (format
             (cosmo-join
@@ -606,7 +606,7 @@
               ((file-executable-p file)
                (compile (if (cosmo-contains "/" file)
                             file
-                          (format "./%s" file))))
+                          (format "build/run ./%s" file))))
               ((memq major-mode '(c-mode c++-mode asm-mode fortran-mode))
                (let* ((mode (cosmo--make-mode arg))
                       (compile-command (cosmo--compile-command this root 'run mode "" "" ".runs")))

tool/hello/hello.c

@@ -0,0 +1,12 @@
+#include "libc/calls/calls.h"
+#include "libc/str/str.h"
+
+// hello world with minimal build system dependencies
+
+static ssize_t Write(int fd, const char *s) {
+  return write(fd, s, strlen(s));
+}
+
+int main(int argc, char *argv[]) {
+  Write(1, "hello world\n");
+}

tool/hello/hello.mk

@@ -0,0 +1,39 @@
+#-*-mode:makefile-gmake;indent-tabs-mode:t;tab-width:8;coding:utf-8-*-┐
+#───vi: set et ft=make ts=8 tw=8 fenc=utf-8 :vi───────────────────────┘
+
+PKGS += TOOL_HELLO
+
+TOOL_HELLO_SRCS := $(wildcard tool/hello/*.c)
+TOOL_HELLO_OBJS = $(TOOL_HELLO_SRCS:%.c=o/$(MODE)/%.o)
+TOOL_HELLO_COMS = $(TOOL_HELLO_SRCS:%.c=o/$(MODE)/%.com)
+TOOL_HELLO_BINS = $(TOOL_HELLO_COMS) $(TOOL_HELLO_COMS:%=%.dbg)
+
+TOOL_HELLO_DIRECTDEPS =				\
+	LIBC_CALLS				\
+	LIBC_INTRIN				\
+	LIBC_NEXGEN32E				\
+	LIBC_RUNTIME				\
+	LIBC_STR				\
+	LIBC_STUBS
+
+TOOL_HELLO_DEPS :=				\
+	$(call uniq,$(foreach x,$(TOOL_HELLO_DIRECTDEPS),$($(x))))
+
+o/$(MODE)/tool/hello/hello.pkg:			\
+		$(TOOL_HELLO_OBJS)		\
+		$(foreach x,$(TOOL_HELLO_DIRECTDEPS),$($(x)_A).pkg)
+
+o/$(MODE)/tool/hello/%.com.dbg:			\
+		$(TOOL_HELLO_DEPS)		\
+		o/$(MODE)/tool/hello/%.o	\
+		o/$(MODE)/tool/hello/hello.pkg	\
+		$(CRT)				\
+		$(APE_NO_MODIFY_SELF)
+	@$(APELINK)
+
+$(TOOL_HELLO_OBJS):				\
+		$(BUILD_FILES)			\
+		tool/hello/hello.mk
+
+.PHONY: o/$(MODE)/tool/hello
+o/$(MODE)/tool/hello: $(TOOL_HELLO_BINS) $(TOOL_HELLO_CHECKS)

tool/tool.mk

@@ -8,6 +8,7 @@ o/$(MODE)/tool:			\
 	o/$(MODE)/tool/curl	\
 	o/$(MODE)/tool/decode	\
 	o/$(MODE)/tool/hash	\
+	o/$(MODE)/tool/hello	\
 	o/$(MODE)/tool/lambda	\
 	o/$(MODE)/tool/net	\
 	o/$(MODE)/tool/plinko	\