user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<bcd_div>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x58,%rsp
  mov    %rdi,-0x58(%rbp)
  mov    %rsi,-0x60(%rbp)
  mov    %edx,-0x64(%rbp)
  mov    %rcx,-0x70(%rbp)
  mov    %r8d,-0x68(%rbp)
  mov    %r9,-0x78(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  mov    %rsp,%rax
  mov    %rax,%rbx
  mov    -0x60(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x31,%al
  jne    L1
  mov    -0x60(%rbp),%rax
  add    $0x1,%rax
  movzbl (%rax),%eax
  cmp    $0x30,%al
  jne    L1
  mov    $0xffffffff,%eax
  jmp    L117
L1:
  movl   $0x0,-0x50(%rbp)
  jmp    L45
L34:
  mov    -0x50(%rbp),%eax
  movslq %eax,%rdx
  mov    -0x58(%rbp),%rax
  add    %rdx,%rax
  mov    -0x50(%rbp),%edx
  movslq %edx,%rcx
  mov    -0x70(%rbp),%rdx
  add    %rcx,%rdx
  movzbl (%rax),%eax
  mov    %al,(%rdx)
  addl   $0x1,-0x50(%rbp)
L45:
  mov    -0x50(%rbp),%eax
  cmp    -0x64(%rbp),%eax
  jl     L34
  movl   $0x0,-0x4c(%rbp)
  jmp    L55
L53:
  mov    -0x70(%rbp),%rcx
  mov    -0x64(%rbp),%edx
  mov    -0x60(%rbp),%rsi
  mov    -0x70(%rbp),%rax
  mov    %rax,%rdi
  call   <bcd_sub@plt>
  addl   $0x1,-0x4c(%rbp)
L55:
  mov    -0x60(%rbp),%rdx
  mov    -0x70(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <bcd_gt@plt>
  cmp    $0x1,%eax
  je     L53
  mov    -0x60(%rbp),%rdx
  mov    -0x70(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <bcd_eq@plt>
  cmp    $0x1,%eax
  je     L53
  mov    -0x70(%rbp),%rdx
  mov    -0x64(%rbp),%ecx
  mov    -0x4c(%rbp),%eax
  mov    %ecx,%esi
  mov    %eax,%edi
  call   <bcd_encode@plt>
  mov    -0x64(%rbp),%eax
  movslq %eax,%rdx
  sub    $0x1,%rdx
  mov    %rdx,-0x48(%rbp)
  movslq %eax,%rdx
  mov    %rdx,%r14
  mov    $0x0,%r15d
  movslq %eax,%rdx
  mov    %rdx,%r12
  mov    $0x0,%r13d
  cltq
  mov    $0x10,%edx
  sub    $0x1,%rdx
  add    %rdx,%rax
  mov    $0x10,%edi
  mov    $0x0,%edx
  div    %rdi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L8:
  cmp    %rdx,%rsp
  je     L74
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L8
L74:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L41
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L41:
  mov    %rsp,%rax
  add    $0x0,%rax
  mov    %rax,-0x40(%rbp)
  mov    -0x40(%rbp),%rcx
  mov    -0x64(%rbp),%edx
  mov    -0x70(%rbp),%rsi
  mov    -0x60(%rbp),%rax
  mov    %rax,%rdi
  call   <bcd_mul@plt>
  mov    -0x78(%rbp),%rcx
  mov    -0x64(%rbp),%edx
  mov    -0x40(%rbp),%rsi
  mov    -0x58(%rbp),%rax
  mov    %rax,%rdi
  call   <bcd_sub@plt>
  mov    $0x0,%eax
L117:
  mov    %rbx,%rsp
  mov    -0x38(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L3
  call   <__stack_chk_fail@plt>
L3:
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
```

assistant: ```c
int bcd_div(char *s, char *t, int n, char *u, int m, char *v) {
  if ((t[0] - 48) == 1 && (t[1] - 48) == 0) {
    return -1;
  }
  int i;
  for (i = 0; i < n; i++) {
    u[i] = s[i];
  }
  int j;
  j = 0;
  while (bcd_gt(u, t) == 1 || bcd_eq(u, t) == 1) {
    bcd_sub(u, t, n, u);
    j++;
  }
  bcd_encode(j, n, u);
  char tmp[n];
  bcd_mul(t, u, n, tmp);
  bcd_sub(s, tmp, n, v);
  return 0;
}
```