chap-05: Add demo showing data sections

Source code files are both in C and in assembly.

Signed-off-by: Razvan Deaconescu <[email protected]>

curs/chap-05-ihs/08-data/.gitignore

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+/data_c
+/data_asm
+/data_c.s

curs/chap-05-ihs/08-data/Makefile

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+CFLAGS = -m32 -fno-PIC -Wall
+LDFLAGS = -m32 -no-pie
+ASFLAGS = -f elf32
+AS = nasm
+
+.PHONY: all clean
+
+all: data_c data_asm data_c.s
+
+data_c: data_c.o
+
+data_c.o: data_c.c
+
+data_c.s: data_c.c
+	$(CC) -S -o $@ $<
+
+data_asm: data_asm.o
+
+data_asm.o: data_asm.asm
+	$(AS) $(ASFLAGS) -o $@ $<
+
+clean:
+	-rm -f *~
+	-rm -f data_c.o data_c
+	-rm -f data_asm.o data_asm

curs/chap-05-ihs/08-data/data_asm.asm

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+section .data
+global init
+
+init: dd 3
+
+section .bss
+global non_init
+
+non_init: resd 1
+
+section .rodata
+global ro
+
+ro: dd 10
+
+section .text
+
+global main
+
+main:
+    push ebp
+    mov ebp, esp
+
+    leave
+    ret

curs/chap-05-ihs/08-data/data_c.c

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+int non_init;
+int init = 3;
+const int ro = 10;
+
+int main(void)
+{
+	return 0;
+}