TOSWeb/Lib/LibC.HC

#define PUSH_SYSV_REGS                                                         \
  asm {PUSH RCX PUSH RDX PUSH RBX PUSH RBP PUSH RSI PUSH RDI PUSH R8 PUSH R9 PUSH   \
      R10 PUSH R11 PUSH R12 PUSH R13 PUSH R14 PUSH R15}
#define POP_SYSV_REGS                                                          \
  asm {POP R15 POP R14 POP R13 POP R12 POP R11 POP R10 POP R9 POP R8 POP RDI POP    \
      RSI POP RBP POP RBX POP RDX POP RCX}
#define MOV_ANS_RAX asm {MOV [&ans], RAX}
#define MOV_P0_RDI asm {MOV [&p0], RDI}
#define MOV_P1_RSI asm {MOV [&p1], RSI}
#define MOV_P2_RDX asm {MOV [&p2], RDX}
#define MOV_P3_RCX asm {MOV [&p3], RCX}
#define MOV_P4_R8 asm {MOV [&p4], R8}
#define MOV_P5_R9 asm {MOV [&p5], R9}
#define GET_SYSV_ARGS                                                          \
  MOV_P0_RDI MOV_P1_RSI MOV_P2_RDX MOV_P3_RCX MOV_P4_R8 MOV_P5_R9

I64 p0, p1, p2, p3, p4, p5;
I64 elf_argc;
U8 **elf_argv;

#define stdin 0
#define stdout 1
#define stderr 2

asm {
_ELF_CALL::
        PUSH    RBP
        MOV     RBP,RSP
        MOV     RAX,U64 SF_ARG1[RBP]
        MOV     RDI,U64 SF_ARG2[RBP]
        MOV     RSI,U64 SF_ARG3[RBP]
        TEST    RAX,RAX
        JZ      @@05
        CALL    RAX
@@05:   POP     RBP
        RET1    8
}

U0 _main() {
  MOV_P0_RDI
  CallInd(_ELF_CALL, p0, elf_argc, elf_argv);
  MOV_ANS_RAX
  throw('end', TRUE);
}

U0 _exit() {
  MOV_ANS_RAX
  throw('end', TRUE);
}

U0 free() {
  PUSH_SYSV_REGS
  GET_SYSV_ARGS
  debug_print("called free(0x%08x)\n", p0);
  Free(p0);
  POP_SYSV_REGS
}

U64 @malloc(I64 size) {
  U64 ptr = NULL;
  ptr = MAlloc(p0);
  debug_print("malloc(%d), result: 0x%08x\n", size, ptr);
  return ptr;
}

U0 malloc() {
  PUSH_SYSV_REGS
  GET_SYSV_ARGS
  debug_print("called: malloc(%d)\n", p0);
  @malloc(p0);
  POP_SYSV_REGS
}

U0 memcpy() {
  PUSH_SYSV_REGS
  GET_SYSV_ARGS
  debug_print("called: memcpy(0x%08x, 0x%08x, %d)\n", p0, p1, p2);
  MemCpy(p0, p1, p2);
  POP_SYSV_REGS
}

U8 *@memmove(U8 *dest, U8 *src, I64 n) {
  I64 i;
  U8 *from = src;
  U8 *to = dest;
  if (from == to || n == 0)
    return dest;
  if (to > from && to - from < n) {
    /* to overlaps with from */
    /*  <from......>         */
    /*         <to........>  */
    /* copy in reverse, to avoid overwriting from */
    for (i = n - 1; i >= 0; i--)
      to[i] = from[i];
    return dest;
  }
  if (from > to && from - to < n) {
    /* to overlaps with from */
    /*        <from......>   */
    /*  <to........>         */
    /* copy forwards, to avoid overwriting from */
    for (i = 0; i < n; i++)
      to[i] = from[i];
    return dest;
  }
  MemCpy(dest, src, n);
  return dest;
}

U0 memmove() {
  PUSH_SYSV_REGS
  GET_SYSV_ARGS
  debug_print("called: memmove(0x%08x, 0x%08x, %d)\n", p0, p1, p2);
  @memmove(p0, p1, p2);
  POP_SYSV_REGS
}

U0 memset() {
  PUSH_SYSV_REGS
  GET_SYSV_ARGS
  debug_print("called: memset(0x%08x, %d, %d)\n", p0, p1, p2);
  MemSet(p0, p1, p2);
  POP_SYSV_REGS
}

U8 *@realloc(U8 *ptr, I64 size) {
  U8 *new;
  if (!ptr) {
    new = MAlloc(size);
  } else {
    new = MAlloc(size);
    MemCpy(new, ptr, size);
    Free(ptr);
  }
  return new;
}

U0 realloc() {
  PUSH_SYSV_REGS
  GET_SYSV_ARGS
  debug_print("called: realloc(0x%08x, %d)\n", p0, p1);
  @realloc(p0, p1);
  POP_SYSV_REGS
}