qemu-wrapper

commit 5186626b75daaa8eb62087015b348ff45c457ae1
parent 07db6d6b70d6a885c7b2722c95f336e08c327c4a
Author: parazyd <parazyd@dyne.org>
Date:   Fri,  8 Apr 2016 04:33:55 +0200

code and info

Diffstat:
M
README.md
 | 
11
++++++++++-
A
qemu-wrapper.c
 | 
20
++++++++++++++++++++

2 files changed, 30 insertions(+), 1 deletion(-)
diff --git a/README.md b/README.md
@@ -1,2 +1,11 @@
 # qemu-wrapper
-wrapper for executing qemu in build chroots
+
+A simple wrapper for executing qemu in chroot builds.
+With this, it is possible to pass arguments to qemu on chrooting, for example:
+the cpu we wish to emulate.
+
+# Usage
+Compile qemu wrapper with the below command and place it in `chroot/usr/bin/`
+```
+gcc -static qemu-wrapper.c -Os -s -o qemu-wrapper
+```
diff --git a/qemu-wrapper.c b/qemu-wrapper.c
@@ -0,0 +1,20 @@
+/* qemu wrapper
+ * wrapper for executing qemu in build chroots
+ * pass arguments to qemu binary
+ *
+ * ~ parazyd */
+
+#include <string.h>
+#include <unistd.h>
+
+int main(int argc, char **argv, char **envp) {
+	char *newargv[argc + 3];
+
+	newargv[0] = argv[0];
+	newargv[1] = "-cpu";
+	newargv[2] = "cortex-a8"; /* here you can set the cpu you are building for */
+
+	memcpy(&newargv[3], &argv[1], sizeof(*argv) * (argc -1));
+	newargv[argc + 2] = NULL;
+	return execve("/usr/bin/qemu-arm", newargv, envp);
+}