1 files changed, 37 insertions, 35 deletions

diff --git a/src/libgpio/gpio.c b/src/libgpio/gpio.c
index fdc877c..522817f 100644
--- a/src/libgpio/gpio.c
+++ b/src/libgpio/gpio.c
@@ -2,77 +2,79 @@
 
 #include <stdint.h>
 
+#define NOOPTIMIZE __attribute__((optimize(0)))
+
+NOOPTIMIZE
 void gpioMode(gpio_pin_t pin, int mode)
 {
-	register uint32_t r1 __asm("r1") = pin;
-	register uint32_t r2 __asm("r2") = mode;
-	__asm("\
+	uint32_t args[2] = { (uint32_t)pin, mode };
+	__asm volatile("\
 		mov r0, 0; \
-		mov r1, %0; \
-		mov r2, %1; \
+		mov r1, 0; \
+		mov r2, %0; \
 		svc 1; \
-	" :: "r" (r1), "r" (r2));
+	" :: "r" (args));
 }
 
+NOOPTIMIZE
 void gpioType(gpio_pin_t pin, int type)
 {
-	register uint32_t r1 __asm("r1") = pin;
-	register uint32_t r2 __asm("r2") = type;
-	__asm("\
+	uint32_t args[2] = { (uint32_t)pin, type };
+	__asm volatile("\
 		mov r0, 1; \
-		mov r1, %0; \
-		mov r2, %1; \
+		mov r1, 0; \
+		mov r2, %0; \
 		svc 1; \
-	" :: "r" (r1), "r" (r2));
+	" :: "r" (args));
 }
 
+NOOPTIMIZE
 void gpioPuPd(gpio_pin_t pin, int pupd)
 {
-	register uint32_t r1 __asm("r1") = pin;
-	register uint32_t r2 __asm("r2") = pupd;
-	__asm("\
+	uint32_t args[2] = { (uint32_t)pin, pupd };
+	__asm volatile("\
 		mov r0, 2; \
-		mov r1, %0; \
-		mov r2, %1; \
+		mov r1, 0; \
+		mov r2, %0; \
 		svc 1; \
-	" :: "r" (r1), "r" (r2));
+	" :: "r" (args));
 }
 
+NOOPTIMIZE
 void gpioSpeed(gpio_pin_t pin, int speed)
 {
-	register uint32_t r1 __asm("r1") = pin;
-	register uint32_t r2 __asm("r2") = speed;
-	__asm("\
+	uint32_t args[2] = { (uint32_t)pin, speed };
+	__asm volatile("\
 		mov r0, 3; \
-		mov r1, %0; \
-		mov r2, %1; \
+		mov r1, 0; \
+		mov r2, %0; \
 		svc 1; \
-	" :: "r" (r1), "r" (r2));
+	" :: "r" (args));
 }
 
+NOOPTIMIZE
 void gpioWrite(gpio_pin_t pin, int value)
 {
-	register uint32_t r1 __asm("r1") = pin;
-	register uint32_t r2 __asm("r2") = value;
-	__asm("\
+	uint32_t args[2] = { (uint32_t)pin, value };
+	__asm volatile("\
 		mov r0, 4; \
-		mov r1, %0; \
-		mov r2, %1; \
+		mov r1, 0; \
+		mov r2, %0; \
 		svc 1; \
-	" :: "r" (r1), "r" (r2));
+	" :: "r" (args));
 }
 
+NOOPTIMIZE
 int gpioRead(gpio_pin_t pin)
 {
-	int ret = 0;
-	register uint32_t r1 __asm("r1") = pin;
-	register uint32_t r2 __asm("r2") = (uint32_t)&ret;
-	__asm("\
+	volatile int ret = 0;
+	uint32_t args[1] = { (uint32_t)pin };
+	__asm volatile("\
 		mov r0, 5; \
 		mov r1, %0; \
 		mov r2, %1; \
 		svc 1; \
-	" :: "r" (r1), "r" (r2));
+	" :: "r" (&ret), "r" (args));
 	return ret;
 }