Minimal POC

Makefile

@@ -40,3 +40,12 @@ Info.o : src/Info.cpp src/Info.h src/InfoList.h src/Absyn.h
 
 ParseError.o : src/ParseError.cpp src/Info.h src/InfoList.h src/Absyn.h src/ParseError.h
 	${CC} ${CCFLAGS} -c src/ParseError.cpp
+
+lib/runtime.o : lib/runtime.c Makefile
+	gcc -m32 -static  -L/usr/lib/gcc-cross/i686-linux-gnu/8/ -c lib/runtime.c -o lib/runtime.o -fno-stack-protector
+
+hello32.o : hello32.s Makefile
+	as --32 hello32.s -o hello32.o
+
+hello : hello32.o lib/runtime.o Makefile
+	ld -m elf_i386 -Llib/ -e main lib/runtime.o hello32.o -lc -o hello

hello32.s

+hello:
+.string "Hello\n"
+.globl main
+.globl printStr
+.globl printInt
+.globl readInt
+.globl readStr
+.globl error
+.globl exit
+
+main:
+pushl %ebp
+movl %esp, %ebp
+pushl $hello
+call printStr
+movl $0, %eax
+pushl $0
+call exit

hello64.s

+hello: .string "Hello\n"
+.globl main
+main:
+pushq %rbp
+mov %rsp, %rbp
+lea hello(%rip), %rdi
+call puts
+mov $0, %rax
+leave
+ret

lib/runtime.c

+// gcc -m32 -static  -L/usr/lib/gcc-cross/i686-linux-gnu/8/ -c runtime.c -o runtime.o
+// as --32 hello32.s -o hello32.o
+// ld -m elf_i386 -L. -e main runtime.o hello32.o -lc
+#include <stdio.h>
+
+int printInt(int a) {
+	printf("%d\n", a);
+}
+
+int printStr(const char *c) {
+	printf("%s\n", c);
+}
+
+char * readStr() {
+	char *line = NULL;
+	size_t len = 0;
+	getline(&line, &len, stdin);
+	return line;
+}
+
+int readInt () {
+	char minus = 0;
+	int result = 0;
+	char ch;
+	ch = getchar();
+	while (1) {
+		if (ch == '-') break;
+		if (ch >= '0' && ch <= '9') break;
+		ch = getchar();
+	}
+	if (ch == '-') minus = 1; else result = ch-'0';
+	while (1) {
+		ch = getchar();
+		if (ch < '0' || ch > '9') break;
+		result = result*10 + (ch - '0');
+	}
+	if (minus)
+		return -result;
+	else
+		return result;
+}