Add syscalls

syscall/jasmin_syscall.c

@@ -0,0 +1,145 @@
+
+#include "jasmin_syscall.h"
+
+#if defined(__linux__) 
+
+#include <unistd.h>
+#include <stdint.h>
+#include <string.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/random.h>
+#include <sys/mman.h>
+#include <sys/syscall.h>
+#include <linux/futex.h>
+#include <errno.h>
+#include <stdlib.h>
+
+
+
+uint8_t* __jasmin_syscall_randombytes__(uint8_t* _x, uint64_t xlen)
+{
+  int i;
+  uint8_t* x = _x;
+
+  printf("%lx:\n", x);
+
+  for (i = 0; i < xlen; i++)
+  {
+    printf("%02X", _x[i]);
+  }
+  printf("\n");
+
+
+  return _x;
+}
+
+// uint64_t __jasmin_syscall_open__(uint8_t* x, uint64_t xlen)
+// {
+//   uint8_t filename[xlen + 1];
+//   memcpy(filename, x, xlen);
+//   filename[xlen] = 0;
+//
+//   return (uint64_t)open(filename, O_RDWR|O_CREAT, S_IRUSR|S_IWUSR);
+// }
+//
+// uint8_t __jasmin_syscall_close__(uint64_t fd)
+// {
+//   int success = close(fd);
+//
+//   if (success == 0) {
+//     return 1;
+//   } else {
+//     return 0;
+//   }
+// }
+
+uint64_t __jasmin_syscall_open__(uint8_t* x, uint64_t xlen)
+{
+  uint8_t* mem = (uint8_t*)mmap(NULL, 1024, PROT_READ|PROT_WRITE, MAP_SHARED, 3, 0);
+  if (mem == NULL) {
+    puts("mem error");
+    exit(1);
+  }
+  uintptr_t addr = (uintptr_t)(mem - 4096);
+  void* futex_mem = mmap((void*)addr, 1024, PROT_READ|PROT_WRITE, MAP_SHARED, 4, 0);
+  if ((uintptr_t)futex_mem != addr) {
+    puts("mem error 2");
+    exit(1);
+  }
+
+  return (uint64_t)mem;
+}
+
+// uint8_t* __jasmin_syscall_write__(uint8_t* _x, uint64_t xlen, uint64_t fd)
+// {
+//   size_t i;
+//   uint8_t* x = _x;
+//
+//   while (xlen > 0) {
+//     i = write(fd, x, xlen);
+//     if (i < 1) {
+//       continue;
+//     }
+//     x += i;
+//     xlen -= i;
+//   }
+//
+//   return _x;
+// }
+
+uint8_t* __jasmin_syscall_read__(uint8_t* _x, uint64_t xlen, uint64_t fd)
+{
+  uint32_t* addr = (uint32_t*)(uintptr_t)(fd - 4096);
+  long ret = syscall(SYS_futex, addr, FUTEX_WAIT, 0x1, NULL, NULL, 0);
+  if (ret == -1) {
+    printf("%d\n", errno);
+    perror("futex");
+  }
+
+  return _x;
+}
+
+uint8_t* __jasmin_syscall_write__(uint8_t* _x, uint64_t xlen, uint64_t fd)
+{
+  uint32_t* addr = (uint32_t*)(uintptr_t)(fd - 4096);
+  *addr = 1;
+  syscall(SYS_futex, addr, FUTEX_WAKE, 1, NULL, NULL, 0);
+
+  return _x;
+}
+
+// uint8_t* __jasmin_syscall_read__(uint8_t* _x, uint64_t xlen, uint64_t fd)
+// {
+//   size_t i;
+//   uint8_t* x = _x;
+//
+//   i = read(fd, x, xlen);
+//   if (i < 1) {
+//     // Do something
+//     perror("Something went wrong while reading the file");
+//   }
+//   x += i;
+//   xlen -= i;
+//
+//   memset(x, 0, xlen);
+//
+//   return _x;
+// }
+
+#endif
+
+#if defined(__APPLE__)
+
+#include <stdlib.h>
+
+#if !(defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED >= 101200)
+#error "macOS version not supported (>= 10.12)"
+#endif
+
+uint8_t* __jasmin_syscall_randombytes__(uint8_t* x, uint64_t xlen){
+  arc4random_buf(x, xlen);
+  return x;
+}
+
+#endif