stmXX

static int rx_reserve[8];

...

 __asm__(" mov r1, #1\n"
   " mov r2, #2\n"
   " mov r3, #3\n"
   " ldr r0, (reserve)\n"
   " mov r4, r0\n"
   " ????? r0!, {r1-r3}\n"
   " str r0, [r4, #16]\n"
   " b after_data\n"
   "reserve:\n"
   " .long _rx_reserve+12\n"
   "after_data:\n");
 
 printf("%d %d %d [%d] %d %d %d;\ndelta = %d\n",
     rx_reserve[0], rx_reserve[1], rx_reserve[2], rx_reserve[3], rx_reserve[4], rx_reserve[5], rx_reserve[6],
     rx_reserve[7]-(int)(rx_reserve+3) );

?????	Result
stmia	0 0 0 [1] 2 3 0; delta = 12
stmib	0 0 0 [0] 1 2 3; delta = 12
stmda	0 1 2 [3] 0 0 0; delta = -12
stmdb	1 2 3 [0] 0 0 0; delta = -12