inline assembly: improve everywhere

userland/arch/aarch64/asm_hello.c

@@ -2,7 +2,12 @@
 #include <inttypes.h>
 
 int main(void) {
-    register uint32_t x0 __asm__ ("x0");
-    __asm__ ("mov x0, #1;" : : : "%x0");
-    assert(x0 == 1);
+    uint32_t myvar = 1;
+    __asm__ (
+        "add %[myvar], %[myvar], 1;"
+        : [myvar] "=r" (myvar)
+        :
+        :
+    );
+    assert(myvar == 2);
 }

userland/arch/x86_64/asm_hello.c

@@ -5,11 +5,11 @@ int main(void) {
 	uint32_t in = 1;
 	uint32_t out = 0;
 	__asm__ (
-		"movl %1, %%eax;"
+		"mov %[in], %%eax;"
 		"inc %%eax;"
-		"movl %%eax, %0"
-		: "=m" (out)
-		: "m" (in)
+		"mov %%eax, %[out]"
+		: [out] "=g" (out)
+		: [in] "g" (in)
 		: "%eax"
 	);
 	assert(out == in + 1);