user: 请从给定的汇编指令推导出C源代码:

```asm
<opera_mem>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x60,%rsp
  mov    %edi,-0x44(%rbp)
  mov    %esi,-0x48(%rbp)
  mov    %rdx,-0x50(%rbp)
  mov    %rcx,-0x58(%rbp)
  mov    %r8d,-0x5c(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  cmpl   $0x0,-0x48(%rbp)
  jne    L123
  mov    -0x5c(%rbp),%eax
  cltq
  and    $0xfffffffffffffffc,%rax
  mov    %rax,-0x30(%rbp)
  mov    -0x5c(%rbp),%eax
  cltq
  and    $0x3,%eax
  test   %rax,%rax
  je     L144
  mov    -0x30(%rbp),%rax
  add    $0x4,%rax
  jmp    L25
L144:
  mov    -0x30(%rbp),%rax
L25:
  mov    %rax,-0x28(%rbp)
  mov    -0x50(%rbp),%rdx
  mov    -0x30(%rbp),%rax
  lea    (%rdx,%rax,1),%rsi
  lea    -0x20(%rbp),%rdx
  mov    -0x44(%rbp),%eax
  mov    $0x4,%ecx
  mov    %eax,%edi
  call   <getdata@plt>
  movq   $0x0,-0x38(%rbp)
  jmp    L136
L115:
  mov    -0x30(%rbp),%rdx
  mov    -0x38(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,%rdx
  mov    -0x58(%rbp),%rax
  add    %rdx,%rax
  movzbl (%rax),%eax
  lea    -0x20(%rbp),%rcx
  mov    -0x38(%rbp),%rdx
  add    %rcx,%rdx
  mov    %al,(%rdx)
  addq   $0x1,-0x38(%rbp)
L136:
  mov    -0x5c(%rbp),%eax
  cltq
  and    $0x3,%eax
  mov    %rax,%rdx
  mov    -0x38(%rbp),%rax
  cmp    %rax,%rdx
  ja     L115
  movq   $0x0,-0x38(%rbp)
  jmp    L176
L142:
  mov    -0x30(%rbp),%rax
  shr    $0x2,%rax
  mov    %rax,%rdx
  mov    -0x38(%rbp),%rax
  cmp    %rax,%rdx
  jne    L56
  mov    -0x38(%rbp),%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,%rsi
  lea    -0x20(%rbp),%rdx
  mov    -0x44(%rbp),%eax
  mov    $0x4,%ecx
  mov    %eax,%edi
  call   <putdata@plt>
  jmp    L43
L56:
  mov    -0x38(%rbp),%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x58(%rbp),%rax
  add    %rax,%rdx
  mov    -0x38(%rbp),%rax
  lea    0x0(,%rax,4),%rcx
  mov    -0x50(%rbp),%rax
  add    %rcx,%rax
  mov    %rax,%rsi
  mov    -0x44(%rbp),%eax
  mov    $0x4,%ecx
  mov    %eax,%edi
  call   <putdata@plt>
L43:
  addq   $0x1,-0x38(%rbp)
L176:
  mov    -0x28(%rbp),%rax
  shr    $0x2,%rax
  mov    %rax,%rdx
  mov    -0x38(%rbp),%rax
  cmp    %rax,%rdx
  ja     L142
  mov    $0x1,%eax
  jmp    L199
L123:
  cmpq   $0x0,-0x58(%rbp)
  jne    L58
  mov    -0x5c(%rbp),%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x58(%rbp)
  cmpq   $0x0,-0x58(%rbp)
  jne    L58
  mov    $0x0,%eax
  jmp    L199
L58:
  movq   $0x0,-0x38(%rbp)
  jmp    L51
L82:
  mov    -0x38(%rbp),%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,%rsi
  lea    -0x20(%rbp),%rdx
  mov    -0x44(%rbp),%eax
  mov    $0x4,%ecx
  mov    %eax,%edi
  call   <getdata@plt>
  mov    -0x5c(%rbp),%eax
  cltq
  cmp    %rax,-0x38(%rbp)
  jle    L34
  mov    -0x5c(%rbp),%eax
  and    $0x3,%eax
  mov    %eax,%edx
  mov    -0x38(%rbp),%rax
  lea    0x0(,%rax,4),%rcx
  mov    -0x58(%rbp),%rax
  add    %rax,%rcx
  lea    -0x20(%rbp),%rax
  mov    %rax,%rsi
  mov    %rcx,%rdi
  call   <memcpy@plt>
  jmp    L129
L34:
  mov    -0x38(%rbp),%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x58(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  lea    -0x20(%rbp),%rax
  mov    $0x4,%edx
  mov    %rax,%rsi
  mov    %rcx,%rdi
  call   <memcpy@plt>
L129:
  addq   $0x1,-0x38(%rbp)
L51:
  mov    -0x5c(%rbp),%eax
  cltq
  and    $0x3,%eax
  test   %rax,%rax
  jne    L159
  mov    -0x5c(%rbp),%eax
  cltq
  shr    $0x2,%rax
  jmp    L198
L159:
  mov    -0x5c(%rbp),%eax
  cltq
  shr    $0x2,%rax
  add    $0x1,%rax
L198:
  mov    -0x38(%rbp),%rdx
  cmp    %rdx,%rax
  ja     L82
  mov    $0x1,%eax
L199:
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L174
  call   <__stack_chk_fail@plt>
L174:
  leave
  ret
```

assistant: ```c
int opera_mem(pid_t target, int mode, long addr, unsigned char *bytes, int numbytes) {
  unsigned char buff[16];
  long cont, endpadd, startcopy;
  if (mode == 0) {
    startcopy = (numbytes / sizeof(int)) * sizeof(int);
    endpadd = (numbytes % sizeof(int) == 0 ? startcopy : startcopy + sizeof(int));
    getdata(target, addr + startcopy, buff, sizeof(int));
    for (cont = 0; cont < numbytes % sizeof(int); cont++) {
      buff[cont] = bytes[startcopy + cont];
    }
    for (cont = 0; cont < endpadd / sizeof(int); cont++) {
      if (cont == (startcopy / sizeof(int))) {
        putdata(target, (cont * sizeof(int)) + addr, buff, sizeof(int));
      } else {
        putdata(target, (cont * sizeof(int)) + addr, bytes + (cont * sizeof(int)), sizeof(int));
      }
    }
    return 1;
  } else {
    if (bytes == NULL) {
      bytes = (unsigned char *)malloc(sizeof(char) * numbytes);
      if (bytes == NULL)
        return 0;
    }
    for (cont = 0; cont < (numbytes % sizeof(int) == 0 ? numbytes / sizeof(int) : (numbytes / sizeof(int)) + 1); cont++) {
      getdata(target, addr + (cont * sizeof(int)), buff, sizeof(int));
      if (cont > numbytes)
        memcpy(bytes + (cont * sizeof(int)), buff, (numbytes % sizeof(int)));
      else
        memcpy(bytes + (cont * sizeof(int)), buff, sizeof(int));
    }
    return 1;
  }
}
```