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  1. #include <stdint.h>
  2.  
  3. int64_t
  4. linux_system_call_6_x86_64(uint64_t number,
  5.                            uint64_t _1, uint64_t _2, uint64_t _3,
  6.                            uint64_t _4, uint64_t _5, uint64_t _6)
  7. {
  8.     int64_t return_value;
  9.  
  10.     register uint64_t r10 __asm__ ("r10") = _4;
  11.     register uint64_t r8  __asm__ ("r8")  = _5;
  12.     register uint64_t r9  __asm__ ("r9")  = _6;
  13.  
  14.     __asm__ volatile ( "syscall"
  15.                      : "=a" (return_value)
  16.                      : "a" (number), "D" (_1), "S" (_2), "d" (_3), "r" (r10), "r" (r8), "r" (r9)
  17.                      : "rcx", "r11", "cc", "memory");
  18.  
  19.     return return_value;
  20. }
  21.  
  22. #define system_call_1(number, _1) \
  23.         linux_system_call_6_x86_64((number), (_1), 0, 0, 0, 0, 0)
  24.  
  25. #define system_call_3(number, _1, _2, _3) \
  26.         linux_system_call_6_x86_64((number), (_1), (_2), (_3), 0, 0, 0)
  27.  
  28. int main(void) {
  29.     static const char message[] = "System calls work." "\n";
  30.  
  31.     /* write stdout message sizeof(message) */
  32.     system_call_3(1, 1, message, sizeof message);
  33.  
  34.     /* exit 0 */
  35.     system_call_1(60, 0);
  36.  
  37.     return 1; /* Unreachable. */
  38. }
Success #stdin #stdout 0s 4396KB
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Standard input is empty
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System calls work.
https://ideone.com/Oe5wuP
System call test.
language:
C (gcc 8.3)
created:
6 years ago
visibility:
public

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