From a1ff34dbca41a1574f64ef515739da50f8a1950a Mon Sep 17 00:00:00 2001
From: Takumi Sueda <puhitaku@gmail.com>
Date: Thu, 4 Mar 2021 06:15:54 +0900
Subject: [PATCH] Add x1 C example / improve extract.py to extract all sections
 after .text

---
 x1/Makefile   |  12 +++++++++++-
 x1/c/main.bin | Bin 0 -> 1064 bytes
 x1/c/main.c   |  14 ++++++++++++++
 x1/c/start.S  |   7 +++++++
 x1/extract.py |   6 ++++--
 5 files changed, 36 insertions(+), 3 deletions(-)
 create mode 100644 x1/c/main.bin
 create mode 100644 x1/c/main.c
 create mode 100644 x1/c/start.S

diff --git a/x1/Makefile b/x1/Makefile
index 9a4bf0a..792b07d 100644
--- a/x1/Makefile
+++ b/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 $@
+	#@rm -f a.out
diff --git a/x1/c/main.bin b/x1/c/main.bin
new file mode 100644
index 0000000000000000000000000000000000000000..74bbb377e61b97c7339460c7e3253ed25fcc81c6
GIT binary patch
literal 1064
zcma)4O=}Zj5T188ZEeV5TOx`EiJF5Jvnj3Gq8^eaHHr!%et}4KH@n!yWH)5rfMqYe
z_zUd+s0R-PDSFU9;9c+}dQh|{F$aBSlQ*Qng9GzE^UORm?|zI?E`BAV-^SM7m#tUN
zU($|oBd)!+%KIOxu|=o*R_4>(cVlPahe!)xY{eU5Ikx&Z`#8({pO;>&efvmnvMYO6
zAOA|loq8DquX(Ljn12v<TQ1eB)l2y^HP7+wAiruZn~TMzvx9&t=OMN|+wn;(Ae>sc
zzfRNXnaUwCtEE%(sjN6Gj_60lF)b%fi3M>^tLf1F%eF}*X?=*hBd#TRL#X<}2|A??
zjMHgq*f~h2=;xm~glZm<M%l3rt{(?i^NDmi0sd|@MI)|fhWB&-B6v;=p9}hv6TCFR
z%i!vM1O1mL>UHq<xbG%#9(Bg?`FAJyqX|wW+3u8@&CTmiFRn#qNClhPwjY>HD!5dT
z)Mz+S)QF_rm5s)bd4W5MlS<Np;;`VkwzP>Ekr{2arR@M^cYqrz3PS0bPlBH5^!%1v
z^j$Kg_e_%64U++8Gi<lL0Ex<-Tc#~#*LQl-i|`8nZT$Ub;QYmTPqu*txH7c?CK9|Q
z({TRYyTFHVWlG0u%Q~LN|J?w|C=pQUt{`R||8KS&NNx}&C)e25;n>PflEkr!<OM~5
utYKpuY)wL`gT!q(zZ>7r_Zsk7`1qE;MU#b`GBuC)dR&(Wxu--xrTYs4_J(}`

literal 0
HcmV?d00001

diff --git a/x1/c/main.c b/x1/c/main.c
new file mode 100644
index 0000000..04205a4
--- /dev/null
+++ b/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;
+    }
+}
diff --git a/x1/c/start.S b/x1/c/start.S
new file mode 100644
index 0000000..99f2d08
--- /dev/null
+++ b/x1/c/start.S
@@ -0,0 +1,7 @@
+.align 2
+.global _start
+
+_start:
+    push {r4, lr}
+    bl main
+    pop {r4, pc}
diff --git a/x1/extract.py b/x1/extract.py
index dc05a13..6d0c609 100755
--- a/x1/extract.py
+++ b/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()