1#include <stdio.h>
2
3char buffer[] ="0123456789abcdef";
4char target[] ="XXXXXXXXXXXXXXXX";
5
6int main(void)
7{
8   setbuf(stdout, NULL);
9
10   printf("------- Copy 10+1 bytes from buffer to target\n");
11   printf("------- EXRL to OR in the length\n");
12   printf("before: buffer = |%s|\n", buffer);
13   printf("before: target = |%s|\n", target);
14   asm volatile( "lghi 2, 10\n\t"
15                 ".insn ril,0xc60000000000,2,1f\n\t" // exrl 2, 1f
16                 "j    2f\n\t"
17                 "1:\n\t"
18                 "mvc  0(1,%0),0(%1)\n\t"
19                 "2:\n\t"
20                 : : "a" (target), "a" (buffer) : "1", "2", "memory");
21   printf("after:  buffer = |%s|\n", buffer);
22   printf("after:  target = |%s|\n", target);
23   printf("\n");
24
25   printf("------- EXRL 0,... has no effect (writes out target)\n");
26   printf("        target = |");
27   asm volatile( "lghi 0, 0xff\n\t" // fill nonsense in r0
28                 "lghi 2, 1\n\t"    // stdout
29                 "lgr  3, %0\n\t"   // target
30                 "lghi 4, %1\n\t"   // len
31                 ".insn ril,0xc60000000000,0,1f\n\t" // exrl 0, 1f
32                 "j    2f\n\t"
33                 "1:\n\t"
34                 "svc  4\n\t"       // NR_write
35                 "2:\n\t"
36                 : : "a" (target), "i" (sizeof target - 1)
37                 : "0", "2", "3", "4");
38   printf("|\n");
39   printf("\n");
40
41   printf("------- EXRL to OR in the syscall number (writes out target)\n");
42   printf("        target = |");
43   asm volatile( "lghi 1, 4\n\t"    // NR_write
44                 "lghi 2, 1\n\t"    // stdout
45                 "lgr  3, %0\n\t"   // target
46                 "lghi 4, %1\n\t"   // len
47                 ".insn ril,0xc60000000000,1,1f\n\t" // exrl 1, 1f
48                 "j    2f\n\t"
49                 "1:\n\t"
50                 "svc  0\n\t"       // changed to NR_write
51                 "2:\n\t"
52                 : : "a" (target), "i" (sizeof target - 1)
53                 : "1", "2", "3", "4");
54   printf("|\n");
55   printf("\n");
56
57   return 0;
58}
59
60