* Allow crc32 to be used at address 0x000

* Provide consistent interface to standalone applications to access
  the 'global_data' structure
  Provide a doc/README.standalone more useful to users/developers.

* Make IceCube MGT5100 FEC driver work

2 files changed, 90 insertions, 1 deletions

diff --git a/examples/stubs.c b/examples/stubs.c
index c0ef65048..9c4c51b0e 100644
--- a/examples/stubs.c
+++ b/examples/stubs.c
@@ -9,6 +9,7 @@
  * to the application program.
  */
 static void **jt;
+gd_t *global_data;
 
 #define EXPORT_FUNC(x) \
 	asm volatile (			\
@@ -80,7 +81,8 @@ void app_startup(char **argv)
 {
 #if defined(CONFIG_I386)
 	/* x86 does not have a dedicated register for passing global_data */
-	jt = ((gd_t *)argv[-1])->jt;
+	global_data = (gd_t *)argv[-1];
+	jt = global_data->jt;
 #endif
 }
 
diff --git a/examples/x86-testapp.c b/examples/x86-testapp.c
new file mode 100644
index 000000000..a1ab319ae
--- /dev/null
+++ b/examples/x86-testapp.c
@@ -0,0 +1,87 @@
+#include <stddef.h>
+#include <stdio.h>
+#include <string.h>
+
+void *func[8], **pfunc;
+
+typedef struct xxx xxx_t;
+struct xxx {
+	int dummy;
+	void **pfunc;
+} q;
+
+#define XF_strcpy 3
+#define XF_printf 4
+
+#define LABEL(x)					\
+asm volatile (						\
+
+#if defined(__i386__)
+#define EXPORT_FUNC(x)					\
+asm volatile (						\
+"	.globl mon_" #x "\n"				\
+"mon_" #x ":\n"						\
+"	movl	%0, %%eax\n"				\
+"	movl	pfunc, %%ecx\n"				\
+"	jmp	*(%%ecx,%%eax)\n"			\
+	: : "i"(XF_ ## x * sizeof(void *)) : "eax", "ecx");
+#elif defined(__powerpc__)
+#define EXPORT_FUNC(x)					\
+asm volatile (						\
+"	.globl mon_" #x "\n"				\
+"mon_" #x ":\n"						\
+"	lwz	%%r11, %0(%%r29)\n"			\
+"	lwz	%%r11, %1(%%r11)\n"			\
+"	mtctr	%%r11\n"				\
+"	bctr\n"					\
+	: : "i"(offsetof(xxx_t, pfunc)), "i"(XF_ ## x * sizeof(void *)) : "r11", "r29");
+#elif defined(__arm__)
+#define EXPORT_FUNC(x)					\
+asm volatile (						\
+"	.globl mon_" #x "\n"				\
+"mon_" #x ":\n"						\
+"	ldr	ip, [r8, %0]\n"				\
+"	ldr	pc, [ip, %1]\n"				\
+	: : "i"(offsetof(xxx_t, pfunc)), "i"(XF_ ## x * sizeof(void *)) : "ip");
+#elif defined(__mips__)
+#define EXPORT_FUNC(x)					\
+asm volatile (						\
+"	.globl mon_" #x "\n"				\
+"mon_" #x ":\n"						\
+"	lw	$25, %0($26)\n"				\
+"	lw	$25, %1($25)\n"				\
+"	jr	$25\n"					\
+	: : "i"(offsetof(xxx_t, pfunc)), "i"(XF_ ## x * sizeof(void *)) : "t9");
+#else
+#error [No stub code for this arch]
+#endif
+
+void dummy(void)
+{
+EXPORT_FUNC(printf)
+EXPORT_FUNC(strcpy)
+}
+
+int main(void)
+{
+#if defined(__i386__)
+	xxx_t *pq;
+#elif defined(__powerpc__)
+	register volatile xxx_t *pq asm("r29");
+#elif defined(__arm__)
+	register volatile xxx_t *pq asm("r8");
+#elif defined(__mips__)
+	register volatile xxx_t *pq asm("k0");
+#endif
+	char buf[32];
+
+	func[XF_strcpy] = strcpy;
+	func[XF_printf] = printf;
+	pq = &q;
+	pq->pfunc = pfunc = func;
+
+	mon_strcpy(buf, "test");
+	mon_printf("hi %s %d z\n", buf, 444);
+
+	return 0;
+}