diff --git a/api/api.c b/api/api.c
index c5f6edb..2639ee5 100644
--- a/api/api.c
+++ b/api/api.c
@@ -52,7 +52,7 @@ static int API_getc(va_list ap)
 {
 	int *c;
 
-	if ((c = (int *)va_arg(ap, u_int32_t)) == NULL)
+	if ((c = (int *)va_arg(ap, uintptr_t)) == NULL)
 		return API_EINVAL;
 
 	*c = getc();
@@ -68,7 +68,7 @@ static int API_tstc(va_list ap)
 {
 	int *t;
 
-	if ((t = (int *)va_arg(ap, u_int32_t)) == NULL)
+	if ((t = (int *)va_arg(ap, uintptr_t)) == NULL)
 		return API_EINVAL;
 
 	*t = tstc();
@@ -84,7 +84,7 @@ static int API_putc(va_list ap)
 {
 	char *c;
 
-	if ((c = (char *)va_arg(ap, u_int32_t)) == NULL)
+	if ((c = (char *)va_arg(ap, uintptr_t)) == NULL)
 		return API_EINVAL;
 
 	putc(*c);
@@ -100,7 +100,7 @@ static int API_puts(va_list ap)
 {
 	char *s;
 
-	if ((s = (char *)va_arg(ap, u_int32_t)) == NULL)
+	if ((s = (char *)va_arg(ap, uintptr_t)) == NULL)
 		return API_EINVAL;
 
 	puts(s);
@@ -132,7 +132,7 @@ static int API_get_sys_info(va_list ap)
 {
 	struct sys_info *si;
 
-	si = (struct sys_info *)va_arg(ap, u_int32_t);
+	si = (struct sys_info *)va_arg(ap, uintptr_t);
 	if (si == NULL)
 		return API_ENOMEM;
 
@@ -148,7 +148,7 @@ static int API_udelay(va_list ap)
 {
 	unsigned long *d;
 
-	if ((d = (unsigned long *)va_arg(ap, u_int32_t)) == NULL)
+	if ((d = (unsigned long *)va_arg(ap, uintptr_t)) == NULL)
 		return API_EINVAL;
 
 	udelay(*d);
@@ -164,11 +164,11 @@ static int API_get_timer(va_list ap)
 {
 	unsigned long *base, *cur;
 
-	cur = (unsigned long *)va_arg(ap, u_int32_t);
+	cur = (unsigned long *)va_arg(ap, uintptr_t);
 	if (cur == NULL)
 		return API_EINVAL;
 
-	base = (unsigned long *)va_arg(ap, u_int32_t);
+	base = (unsigned long *)va_arg(ap, uintptr_t);
 	if (base == NULL)
 		return API_EINVAL;
 
@@ -199,7 +199,7 @@ static int API_dev_enum(va_list ap)
 	struct device_info *di;
 
 	/* arg is ptr to the device_info struct we are going to fill out */
-	di = (struct device_info *)va_arg(ap, u_int32_t);
+	di = (struct device_info *)va_arg(ap, uintptr_t);
 	if (di == NULL)
 		return API_EINVAL;
 
@@ -233,7 +233,7 @@ static int API_dev_open(va_list ap)
 	int err = 0;
 
 	/* arg is ptr to the device_info struct */
-	di = (struct device_info *)va_arg(ap, u_int32_t);
+	di = (struct device_info *)va_arg(ap, uintptr_t);
 	if (di == NULL)
 		return API_EINVAL;
 
@@ -265,7 +265,7 @@ static int API_dev_close(va_list ap)
 	int err = 0;
 
 	/* arg is ptr to the device_info struct */
-	di = (struct device_info *)va_arg(ap, u_int32_t);
+	di = (struct device_info *)va_arg(ap, uintptr_t);
 	if (di == NULL)
 		return API_EINVAL;
 
@@ -319,7 +319,7 @@ static int API_dev_write(va_list ap)
 	int err = 0;
 
 	/* 1. arg is ptr to the device_info struct */
-	di = (struct device_info *)va_arg(ap, u_int32_t);
+	di = (struct device_info *)va_arg(ap, uintptr_t);
 	if (di == NULL)
 		return API_EINVAL;
 
@@ -329,12 +329,12 @@ static int API_dev_write(va_list ap)
 		return API_ENODEV;
 
 	/* 2. arg is ptr to buffer from where to get data to write */
-	buf = (void *)va_arg(ap, u_int32_t);
+	buf = (void *)va_arg(ap, uintptr_t);
 	if (buf == NULL)
 		return API_EINVAL;
 
 	/* 3. arg is length of buffer */
-	len = (int *)va_arg(ap, u_int32_t);
+	len = (int *)va_arg(ap, uintptr_t);
 	if (len == NULL)
 		return API_EINVAL;
 	if (*len <= 0)
@@ -387,7 +387,7 @@ static int API_dev_read(va_list ap)
 	int *len_net, *act_len_net;
 
 	/* 1. arg is ptr to the device_info struct */
-	di = (struct device_info *)va_arg(ap, u_int32_t);
+	di = (struct device_info *)va_arg(ap, uintptr_t);
 	if (di == NULL)
 		return API_EINVAL;
 
@@ -397,23 +397,23 @@ static int API_dev_read(va_list ap)
 		return API_ENODEV;
 
 	/* 2. arg is ptr to buffer from where to put the read data */
-	buf = (void *)va_arg(ap, u_int32_t);
+	buf = (void *)va_arg(ap, uintptr_t);
 	if (buf == NULL)
 		return API_EINVAL;
 
 	if (di->type & DEV_TYP_STOR) {
 		/* 3. arg - ptr to var with # of blocks to read */
-		len_stor = (lbasize_t *)va_arg(ap, u_int32_t);
+		len_stor = (lbasize_t *)va_arg(ap, uintptr_t);
 		if (!len_stor)
 			return API_EINVAL;
 		if (*len_stor <= 0)
 			return API_EINVAL;
 
 		/* 4. arg - ptr to var with start block */
-		start = (lbastart_t *)va_arg(ap, u_int32_t);
+		start = (lbastart_t *)va_arg(ap, uintptr_t);
 
 		/* 5. arg - ptr to var where to put the len actually read */
-		act_len_stor = (lbasize_t *)va_arg(ap, u_int32_t);
+		act_len_stor = (lbasize_t *)va_arg(ap, uintptr_t);
 		if (!act_len_stor)
 			return API_EINVAL;
 
@@ -422,14 +422,14 @@ static int API_dev_read(va_list ap)
 	} else if (di->type & DEV_TYP_NET) {
 
 		/* 3. arg points to the var with length of packet to read */
-		len_net = (int *)va_arg(ap, u_int32_t);
+		len_net = (int *)va_arg(ap, uintptr_t);
 		if (!len_net)
 			return API_EINVAL;
 		if (*len_net <= 0)
 			return API_EINVAL;
 
 		/* 4. - ptr to var where to put the len actually read */
-		act_len_net = (int *)va_arg(ap, u_int32_t);
+		act_len_net = (int *)va_arg(ap, uintptr_t);
 		if (!act_len_net)
 			return API_EINVAL;
 
@@ -453,9 +453,9 @@ static int API_env_get(va_list ap)
 {
 	char *name, **value;
 
-	if ((name = (char *)va_arg(ap, u_int32_t)) == NULL)
+	if ((name = (char *)va_arg(ap, uintptr_t)) == NULL)
 		return API_EINVAL;
-	if ((value = (char **)va_arg(ap, u_int32_t)) == NULL)
+	if ((value = (char **)va_arg(ap, uintptr_t)) == NULL)
 		return API_EINVAL;
 
 	*value = getenv(name);
@@ -476,9 +476,9 @@ static int API_env_set(va_list ap)
 {
 	char *name, *value;
 
-	if ((name = (char *)va_arg(ap, u_int32_t)) == NULL)
+	if ((name = (char *)va_arg(ap, uintptr_t)) == NULL)
 		return API_EINVAL;
-	if ((value = (char *)va_arg(ap, u_int32_t)) == NULL)
+	if ((value = (char *)va_arg(ap, uintptr_t)) == NULL)
 		return API_EINVAL;
 
 	setenv(name, value);
@@ -498,9 +498,9 @@ static int API_env_enum(va_list ap)
 	int i, n;
 	char *last, **next;
 
-	last = (char *)va_arg(ap, u_int32_t);
+	last = (char *)va_arg(ap, uintptr_t);
 
-	if ((next = (char **)va_arg(ap, u_int32_t)) == NULL)
+	if ((next = (char **)va_arg(ap, uintptr_t)) == NULL)
 		return API_EINVAL;
 
 	if (last == NULL)
@@ -586,7 +586,7 @@ static cfp_t calls_table[API_MAXCALL] = { NULL, };
  * The main syscall entry point - this is not reentrant, only one call is
  * serviced until finished.
  *
- * e.g. syscall(1, int *, u_int32_t, u_int32_t, u_int32_t, u_int32_t);
+ * e.g. syscall(1, int *, uintptr_t, uintptr_t, uintptr_t, uintptr_t);
  *
  * call:	syscall number
  *
diff --git a/examples/api/crt0.S b/examples/api/crt0.S
index 78d35a2..eb6312e 100644
--- a/examples/api/crt0.S
+++ b/examples/api/crt0.S
@@ -25,6 +25,22 @@ syscall:
 	mtctr	%r11
 	bctr
 
+#elif defined(CONFIG_ARM64)
+
+	.text
+	.globl _start
+_start:
+        ldr     x14, =search_hint
+        mov     x15, sp
+	str	x15, [x14]
+	b	main
+
+
+	.globl syscall
+syscall:
+        ldr     x15, syscall_ptr
+        br      x15
+
 #elif defined(CONFIG_ARM)
 
 	.text
@@ -45,10 +61,10 @@ syscall:
 #endif
 
 	.globl syscall_ptr
+	.align	3
 syscall_ptr:
-	.align	4
-	.long	0
+	.quad	0
 
 	.globl search_hint
 search_hint:
-	.long   0
+	.quad   0
diff --git a/examples/api/demo.c b/examples/api/demo.c
index 8c30457..e1693ef 100644
--- a/examples/api/demo.c
+++ b/examples/api/demo.c
@@ -43,12 +43,11 @@ int main(int argc, char * const argv[])
 	if (sig->version > API_SIG_VERSION)
 		return -3;
 
-	printf("API signature found @%x\n", (unsigned int)sig);
+	printf("API signature found @0x%p\n", sig);
 	test_dump_sig(sig);
 
 	printf("\n*** Consumer API test ***\n");
-	printf("syscall ptr 0x%08x@%08x\n", (unsigned int)syscall_ptr,
-		(unsigned int)&syscall_ptr);
+	printf("syscall ptr 0x%p @0x%p\n", syscall_ptr,	&syscall_ptr);
 
 	/* console activities */
 	ub_putc('B');
@@ -203,7 +202,7 @@ void test_dump_sig(struct api_signature *sig)
 	printf("signature:\n");
 	printf("  version\t= %d\n", sig->version);
 	printf("  checksum\t= 0x%08x\n", sig->checksum);
-	printf("  sc entry\t= 0x%08x\n", (unsigned int)sig->syscall);
+	printf("  sc entry\t= 0x%p\n", (void *)sig->syscall);
 }
 
 void test_dump_si(struct sys_info *si)
@@ -296,7 +295,7 @@ void test_dump_di(int handle)
 	struct device_info *di = ub_dev_get(handle);
 
 	printf("device info (%d):\n", handle);
-	printf("  cookie\t= 0x%08x\n", (uint32_t)di->cookie);
+	printf("  cookie\t= 0x%p\n", di->cookie);
 	printf("  type\t\t= 0x%08x\n", di->type);
 
 	if (di->type == DEV_TYP_NET) {
diff --git a/examples/api/glue.c b/examples/api/glue.c
index d619518..d5c1809 100644
--- a/examples/api/glue.c
+++ b/examples/api/glue.c
@@ -41,8 +41,8 @@ static int valid_sig(struct api_signature *sig)
 int api_search_sig(struct api_signature **sig)
 {
 	unsigned char *sp;
-	uint32_t search_start = 0;
-	uint32_t search_end = 0;
+	uintptr_t search_start = 0;
+	uintptr_t search_end = 0;
 
 	if (sig == NULL)
 		return 0;
@@ -77,7 +77,7 @@ int ub_getc(void)
 {
 	int c;
 
-	if (!syscall(API_GETC, NULL, (uint32_t)&c))
+	if (!syscall(API_GETC, NULL, (uintptr_t)&c))
 		return -1;
 
 	return c;
@@ -87,7 +87,7 @@ int ub_tstc(void)
 {
 	int t;
 
-	if (!syscall(API_TSTC, NULL, (uint32_t)&t))
+	if (!syscall(API_TSTC, NULL, (uintptr_t)&t))
 		return -1;
 
 	return t;
@@ -95,12 +95,12 @@ int ub_tstc(void)
 
 void ub_putc(char c)
 {
-	syscall(API_PUTC, NULL, (uint32_t)&c);
+	syscall(API_PUTC, NULL, (uintptr_t)&c);
 }
 
 void ub_puts(const char *s)
 {
-	syscall(API_PUTS, NULL, (uint32_t)s);
+	syscall(API_PUTS, NULL, (uintptr_t)s);
 }
 
 /****************************************
@@ -126,7 +126,7 @@ struct sys_info * ub_get_sys_info(void)
 	si.mr_no = UB_MAX_MR;
 	memset(&mr, 0, sizeof(mr));
 
-	if (!syscall(API_GET_SYS_INFO, &err, (u_int32_t)&si))
+	if (!syscall(API_GET_SYS_INFO, &err, (uintptr_t)&si))
 		return NULL;
 
 	return ((err) ? NULL : &si);
@@ -344,7 +344,7 @@ char * ub_env_get(const char *name)
 {
 	char *value;
 
-	if (!syscall(API_ENV_GET, NULL, (uint32_t)name, (uint32_t)&value))
+	if (!syscall(API_ENV_GET, NULL, (uintptr_t)name, (uintptr_t)&value))
 		return NULL;
 
 	return value;
@@ -352,7 +352,7 @@ char * ub_env_get(const char *name)
 
 void ub_env_set(const char *name, char *value)
 {
-	syscall(API_ENV_SET, NULL, (uint32_t)name, (uint32_t)value);
+	syscall(API_ENV_SET, NULL, (uintptr_t)name, (uintptr_t)value);
 }
 
 static char env_name[256];
@@ -369,7 +369,7 @@ const char * ub_env_enum(const char *last)
 	 * 'name=val' string), since the API_ENUM_ENV call uses envmatch()
 	 * internally, which handles such case
 	 */
-	if (!syscall(API_ENV_ENUM, NULL, (uint32_t)last, (uint32_t)&env))
+	if (!syscall(API_ENV_ENUM, NULL, (uintptr_t)last, (uintptr_t)&env))
 		return NULL;
 
 	if (!env)
@@ -396,7 +396,8 @@ int ub_display_get_info(int type, struct display_info *di)
 {
 	int err = 0;
 
-	if (!syscall(API_DISPLAY_GET_INFO, &err, (uint32_t)type, (uint32_t)di))
+	if (!syscall(API_DISPLAY_GET_INFO, &err, (uintptr_t)type,
+                     (uintptr_t)di))
 		return API_ESYSC;
 
 	return err;
diff --git a/examples/api/glue.h b/examples/api/glue.h
index 91c8c1c..3e27a4e 100644
--- a/examples/api/glue.h
+++ b/examples/api/glue.h
@@ -19,7 +19,7 @@
 #define UB_MAX_DEV	6	/* max devices number */
 
 extern void *syscall_ptr;
-extern uint32_t search_hint;
+extern uintptr_t search_hint;
 
 int	syscall(int, int *, ...);
 int	api_search_sig(struct api_signature **sig);
diff --git a/examples/api/libgenwrap.c b/examples/api/libgenwrap.c
index c1afa5b..4f78c15 100644
--- a/examples/api/libgenwrap.c
+++ b/examples/api/libgenwrap.c
@@ -23,7 +23,7 @@ int printf (const char *fmt, ...)
 {
 	va_list args;
 	uint i;
-	char printbuffer[256];
+	char printbuffer[512];
 
 	va_start (args, fmt);