Add x1 C example / improve extract.py to extract all sections after .text

x1/Makefile

@@ -1,10 +1,20 @@
 CROSS_COMPILE:=arm-linux-gnueabihf-
 AS:=$(CROSS_COMPILE)as
+CC:=$(CROSS_COMPILE)gcc
 
 .PHONY:
-all: return.bin mrc.bin
+all: return.bin mrc.bin c/main.bin
+
+.PHONY:
+clean:
+	@rm -f *.bin */*.bin
 
 %.bin: %.S
 	@$(AS) $<
 	@./extract.py a.out $@
 	@rm -f a.out
+
+c/main.bin:
+	@$(CC) -nostdlib -static -fPIC -mcpu=cortex-a7 c/start.S c/main.c
+	@./extract.py a.out $@
+	#@rm -f a.out

x1/c/main.c

@@ -0,0 +1,14 @@
+void main() {
+    char *str = "Hello World";
+    int aa = 1234;
+    int i;
+    for (i=0; i<999; i++) {
+        asm volatile(
+            "mrc p15, 0, r10, c1, c0, 0\n"
+            "bic r10, #1\n"
+            "mcr p15, 0, r10, c1, c0, 0\n"
+            : "=r" (aa)
+        );
+        aa += 1;
+    }
+}

x1/c/start.S

@@ -0,0 +1,7 @@
+.align 2
+.global _start
+
+_start:
+    push {r4, lr}
+    bl main
+    pop {r4, pc}

x1/extract.py

@@ -19,9 +19,11 @@ def extract(elf):
         print('Input ELF has no .text section', file=sys.stderr)
 
     with open(sys.argv[2], 'wb') as f:
-        f.write(text.data())
+        elf.stream.seek(0)
+        elf.stream.read(text.header.sh_offset)
+        f.write(elf.stream.read())
 
-    print(f'Successfully extracted the .text section to "{sys.argv[2]}"')
+    print(f'Successfully extracted the necessary sections to "{sys.argv[2]}"')
 
 
 main()