hello.c, hello.S: hello world target for C compiler.

.gitignore

@@ -12,4 +12,5 @@
 /mescc.test
 ?
 ?.mes
-
+/hello
+/hello.o

GNUmakefile

@@ -100,3 +100,10 @@ mescc.test: lib/lalr.scm c-lexer.scm mescc.scm
 
 guile-mescc: mescc.test
 	cat main.c | guile -s $^ 
+
+hello.o: hello.S
+	as --32 -march=i386 -o $@ $^
+
+hello: hello.o
+	ld -A i386 -m elf_i386 -nostdlib -nodefaultlibs -A i386 -o $@ $^
+#	ld -A i386 -m elf_i386 -A i386 -o $@ $^

hello.S

@@ -0,0 +1,29 @@
+
+.text                           # section declaration
+
+			                          # we must export the entry point to the ELF linker or
+    .global _start              # loader. They conventionally recognize _start as their
+			                          # entry point. Use ld -e foo to override the default.
+
+_start:
+
+                                # write our string to stdout
+
+	  movl    $len,%edx           # third argument: message length
+	  movl    $msg,%ecx           # second argument: pointer to message to write
+	  movl    $1,%ebx             # first argument: file handle (stdout)
+	  movl    $4,%eax             # system call number (sys_write)
+	  int     $0x80               # call kernel
+
+                                # and exit
+
+	  movl    $0,%ebx             # first argument: exit code
+	  movl    $1,%eax             # system call number (sys_exit)
+	  int     $0x80               # call kernel
+
+.data                           # section declaration
+
+msg:
+	.ascii    "Hello, world!\n"   # our dear string
+	len = . - msg                 # length of our dear string
+ 

hello.c

@@ -0,0 +1,5 @@
+int main ()
+{
+  puts ("HALLO\n");
+  return 0;
+}