user: 请将以下的汇编代码转换成C语言代码:

```asm
<step>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x38,%rsp
  mov    %r9d,0xc(%rsp)
  mov    0x70(%rsp),%r9d
  mov    0x78(%rsp),%ebx
  mov    0x80(%rsp),%r11d
  mov    %r8d,%r10d
  sub    %edx,%r10d
  mov    %ecx,%eax
  sub    %esi,%eax
  cmovs  %r10d,%eax
  movslq %esi,%r10
  lea    (%rdi,%r10,8),%rbp
  movslq %edx,%r12
  mov    0x0(%rbp),%r10
  movzbl (%r10,%r12,1),%r10d
  cmp    %bl,%r10b
  je     L213
  lea    (%rcx,%r8,1),%eax
  mov    $0xffffffff,%r15d
  test   $0x1,%al
  jne    L81
  cmp    $0x7,%ecx
  je     L252
  test   %ecx,%ecx
  je     L252
L492:
  mov    $0xffffffff,%r15d
  cmp    0xc(%rsp),%r10b
  je     L56
L81:
  mov    %r15d,%eax
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L213:
  cmp    $0x7,%ecx
  je     L114
  test   %ecx,%ecx
  je     L114
  lea    (%rcx,%r8,1),%r13d
  mov    $0xffffffff,%r15d
  test   $0x1,%r13b
  jne    L81
  movslq %ecx,%r13
  lea    0x0(,%r13,8),%r14
  mov    %r14,0x18(%rsp)
  add    %rdi,%r14
  mov    %r14,0x10(%rsp)
  movslq %r8d,%r13
  mov    (%r14),%r15
  movzbl (%r15,%r13,1),%r15d
  cmp    %r11b,%r15b
  je     L220
  cmp    %r9b,%r15b
  jne    L413
L220:
  cmp    %edx,%r8d
  jle    L207
  lea    0x1(%r13),%r15
  mov    0x18(%rsp),%r14
  mov    %r15,%r11
  add    0x8(%rdi,%r14,1),%r11
  mov    %r11,0x20(%rsp)
  cmpb   $0x2d,(%r11)
  je     L256
L137:
  mov    0x18(%rsp),%r14
  mov    %r15,%r11
  add    -0x8(%rdi,%r14,1),%r11
  cmpb   $0x2d,(%r11)
  jne    L492
  lea    (%rax,%rcx,1),%r15d
  movslq %r15d,%r15
  mov    %r8d,%r14d
  sub    %eax,%r14d
  movslq %r14d,%rax
  mov    (%rdi,%r15,8),%r15
  cmp    %bl,(%r15,%rax,1)
  jne    L492
  mov    %bl,(%r11)
  mov    0x0(%rbp),%rax
  movb   $0x2d,(%rax,%r12,1)
  mov    0x10(%rsp),%rax
  mov    (%rax),%rax
  movb   $0x2d,(%rax,%r13,1)
  mov    $0x1,%r15d
  jmp    L81
L114:
  movslq %ecx,%rax
  lea    (%rdi,%rax,8),%rax
  mov    %rax,0x10(%rsp)
  movslq %r8d,%r13
  mov    (%rax),%rax
  movzbl (%rax,%r13,1),%eax
  cmp    %r11b,%al
  je     L281
  cmp    %r9b,%al
  je     L281
  lea    (%rcx,%r8,1),%eax
  test   $0x1,%al
  je     L413
  mov    $0xffffffff,%r15d
  jmp    L81
L256:
  mov    %ecx,%r14d
  sub    %eax,%r14d
  movslq %r14d,%r14
  mov    %r14,%r11
  mov    %r8d,%r14d
  sub    %eax,%r14d
  movslq %r14d,%r14
  mov    %r14,0x28(%rsp)
  mov    (%rdi,%r11,8),%r11
  mov    0x28(%rsp),%r14
  cmp    %bl,(%r11,%r14,1)
  jne    L137
  mov    0x20(%rsp),%rax
  mov    %bl,(%rax)
  mov    0x0(%rbp),%rax
  movb   $0x2d,(%rax,%r12,1)
  mov    0x10(%rsp),%rax
  mov    (%rax),%rax
  movb   $0x2d,(%rax,%r13,1)
  mov    $0x1,%r15d
  jmp    L81
L207:
  lea    -0x1(%r13),%r15
  mov    0x18(%rsp),%r14
  mov    %r15,%r11
  add    -0x8(%rdi,%r14,1),%r11
  mov    %r11,0x20(%rsp)
  cmpb   $0x2d,(%r11)
  je     L329
L350:
  mov    0x18(%rsp),%r14
  mov    %r15,%r11
  add    0x8(%rdi,%r14,1),%r11
  cmpb   $0x2d,(%r11)
  jne    L492
  mov    %ecx,%r15d
  sub    %eax,%r15d
  movslq %r15d,%r15
  add    %r8d,%eax
  cltq
  mov    (%rdi,%r15,8),%r15
  cmp    %bl,(%r15,%rax,1)
  jne    L492
  mov    %bl,(%r11)
  mov    0x0(%rbp),%rax
  movb   $0x2d,(%rax,%r12,1)
  mov    0x10(%rsp),%rax
  mov    (%rax),%rax
  movb   $0x2d,(%rax,%r13,1)
  mov    $0x1,%r15d
  jmp    L81
L329:
  mov    %ecx,%r14d
  sub    %eax,%r14d
  movslq %r14d,%r14
  mov    %r14,%r11
  mov    %r8d,%r14d
  sub    %eax,%r14d
  movslq %r14d,%r14
  mov    %r14,0x28(%rsp)
  mov    (%rdi,%r11,8),%r11
  mov    0x28(%rsp),%r14
  cmp    %bl,(%r11,%r14,1)
  jne    L350
  mov    0x20(%rsp),%rax
  mov    %bl,(%rax)
  mov    0x0(%rbp),%rax
  movb   $0x2d,(%rax,%r12,1)
  mov    0x10(%rsp),%rax
  mov    (%rax),%rax
  movb   $0x2d,(%rax,%r13,1)
  mov    $0x1,%r15d
  jmp    L81
L413:
  sub    $0x8,%rsp
  movsbl %bl,%eax
  push   %rax
  movsbl %r9b,%r9d
  mov    $0x0,%eax
  call   <restricaodama@plt>
  add    $0x10,%rsp
  mov    $0xffffffff,%r15d
  cmp    $0x2,%eax
  jne    L81
  mov    0x10(%rsp),%rax
  mov    (%rax),%rax
  mov    %bl,(%rax,%r13,1)
  mov    0x0(%rbp),%rax
  movb   $0x2d,(%rax,%r12,1)
  mov    $0x1,%r15d
  jmp    L81
L252:
  movslq %ecx,%rbx
  movslq %r8d,%rax
  mov    (%rdi,%rbx,8),%rbx
  movzbl (%rbx,%rax,1),%eax
  cmp    %r11b,%al
  je     L473
  cmp    %r9b,%al
  jne    L492
L473:
  mov    $0xffffffff,%r15d
  jmp    L81
L56:
  movslq %ecx,%r10
  lea    0x0(,%r10,8),%r13
  lea    (%rdi,%r13,1),%r11
  movslq %r8d,%r14
  mov    %r14,%rbx
  add    (%r11),%rbx
  mov    %rbx,0x28(%rsp)
  movzbl (%rbx),%eax
  mov    0xc(%rsp),%ebx
  cmp    %bl,%al
  je     L81
  cmp    $0x42,%bl
  sete   0x10(%rsp)
  movzbl 0x10(%rsp),%ebx
  cmp    %esi,%ecx
  jle    L392
  test   %bl,%bl
  jne    L81
L392:
  cmpb   $0x50,0xc(%rsp)
  sete   0x18(%rsp)
  cmp    %esi,%ecx
  setl   0x20(%rsp)
  movzbl 0x20(%rsp),%ebx
  mov    $0xffffffff,%r15d
  and    0x18(%rsp),%bl
  mov    %bl,0x20(%rsp)
  jne    L81
  lea    -0x1(%rcx),%r15d
  cmp    %esi,%r15d
  je     L299
  add    $0x1,%ecx
  mov    $0xffffffff,%r15d
  cmp    %esi,%ecx
  jne    L81
L299:
  lea    0x1(%rdx),%ecx
  cmp    %r8d,%ecx
  je     L275
  lea    -0x1(%rdx),%esi
  cmp    %r8d,%esi
  je     L275
  mov    $0xffffffff,%r15d
  cmp    %r9b,%al
  jne    L81
  lea    0x1(%r14),%rsi
  lea    -0x1(%r14),%rcx
L192:
  mov    0x8(%rdi,%r10,8),%rax
  add    %rax,%rsi
  cmpb   $0x2d,(%rsi)
  jne    L407
  movzbl 0x20(%rsp),%edi
  test   %dil,0x18(%rsp)
  jne    L264
L407:
  add    %rcx,%rax
  mov    $0xffffffff,%r15d
  cmpb   $0x2d,(%rax)
  jne    L81
  sub    $0x1,%edx
  cmp    %r8d,%edx
  jne    L39
  cmpb   $0x0,0x18(%rsp)
  jne    L326
L39:
  mov    $0xffffffff,%r15d
  jmp    L81
L275:
  cmp    $0x2d,%al
  je     L78
  mov    $0xffffffff,%r15d
  cmp    %r9b,%al
  jne    L81
  mov    -0x8(%rdi,%r13,1),%rax
  lea    0x1(%r14),%rsi
  lea    (%rax,%rsi,1),%r9
  cmp    %r8d,%ecx
  sete   0x20(%rsp)
  movzbl 0x20(%rsp),%ebx
  cmpb   $0x2d,(%r9)
  jne    L4
  test   %bl,0x10(%rsp)
  jne    L586
L4:
  lea    -0x1(%r14),%rcx
  add    %rcx,%rax
  cmpb   $0x2d,(%rax)
  jne    L192
  lea    -0x1(%rdx),%r9d
  cmp    %r8d,%r9d
  jne    L192
  cmpb   $0x0,0x10(%rsp)
  je     L192
  movb   $0x42,(%rax)
  mov    0x0(%rbp),%rax
  movb   $0x2d,(%rax,%r12,1)
  mov    (%r11),%rax
  movb   $0x2d,(%rax,%r14,1)
  mov    $0x1,%r15d
  jmp    L81
L78:
  movzbl 0xc(%rsp),%eax
  mov    0x28(%rsp),%rbx
  mov    %al,(%rbx)
  mov    0x0(%rbp),%rax
  movb   $0x2d,(%rax,%r12,1)
  mov    $0x1,%r15d
  jmp    L81
L586:
  movb   $0x42,(%r9)
  mov    0x0(%rbp),%rax
  movb   $0x2d,(%rax,%r12,1)
  mov    (%r11),%rax
  movb   $0x2d,(%rax,%r14,1)
  mov    $0x1,%r15d
  jmp    L81
L264:
  movb   $0x50,(%rsi)
  mov    0x0(%rbp),%rax
  movb   $0x2d,(%rax,%r12,1)
  mov    (%r11),%rax
  movb   $0x2d,(%rax,%r14,1)
  mov    $0x1,%r15d
  jmp    L81
L326:
  movb   $0x50,(%rax)
  mov    0x0(%rbp),%rax
  movb   $0x2d,(%rax,%r12,1)
  mov    (%r11),%rax
  movb   $0x2d,(%rax,%r14,1)
  mov    $0x1,%r15d
  jmp    L81
L281:
  mov    $0xffffffff,%r15d
  jmp    L81
```

assistant: ```c
int step(char **matriz, int lin, int col, int linp, int colp, char jogador, char oposto, char dama, char odama) {
  int num = 0;
  num = (linp - lin < 0) ? (colp - col) : (linp - lin);
  if (matriz[lin][col] == dama) {
    if ((linp == 7 || linp == 0) && (matriz[linp][colp] == oposto || matriz[linp][colp] == odama))
      return -1;
    if ((linp + colp) % 2 == 0) {
      if (matriz[linp][colp] == oposto || matriz[linp][colp] == odama) {
        if (colp > col) {
          if (matriz[linp + 1][colp + 1] == '-' && matriz[linp - num][colp - num] == matriz[lin][col]) {
            matriz[linp + 1][colp + 1] = dama;
            matriz[lin][col] = '-';
            matriz[linp][colp] = '-';
            return 1;
          }
          if (matriz[linp - 1][colp + 1] == '-' && matriz[linp + num][colp - num] == matriz[lin][col]) {
            matriz[linp - 1][colp + 1] = dama;
            matriz[lin][col] = '-';
            matriz[linp][colp] = '-';
            return 1;
          }
        } else {
          if (matriz[linp - 1][colp - 1] == '-' && matriz[linp - num][colp - num] == matriz[lin][col]) {
            matriz[linp - 1][colp - 1] = dama;
            matriz[lin][col] = '-';
            matriz[linp][colp] = '-';
            return 1;
          }
          if (matriz[linp + 1][colp - 1] == '-' && matriz[linp - num][colp + num] == matriz[lin][col]) {
            matriz[linp + 1][colp - 1] = dama;
            matriz[lin][col] = '-';
            matriz[linp][colp] = '-';
            return 1;
          }
        }
      } else if (restricaodama(matriz, lin, col, linp, colp, oposto, dama) == 2) {
        matriz[linp][colp] = dama;
        matriz[lin][col] = '-';
        return 1;
      } else
        return -1;
    }
  }
  if ((linp + colp) % 2 == 0) {
    if ((linp == 7 || linp == 0) && (matriz[linp][colp] == oposto || matriz[linp][colp] == odama))
      return -1;
    if (matriz[lin][col] == jogador && matriz[linp][colp] == jogador)
      return -1;
    if ((jogador == 'B' && linp > lin) || (jogador == 'P' && linp < lin))
      return -1;
    if ((matriz[lin][col] == jogador && linp - 1 == lin) || (matriz[lin][col] == jogador && linp + 1 == lin)) {
      if (colp == col + 1 || colp == col - 1) {
        if (matriz[linp][colp] == '-') {
          matriz[linp][colp] = jogador;
          matriz[lin][col] = '-';
          return 1;
        }
      }
      if (matriz[linp][colp] == oposto) {
        if (matriz[linp - 1][colp + 1] == '-' && colp + 1 == col + 2 && jogador == 'B') {
          matriz[linp - 1][colp + 1] = jogador;
          matriz[lin][col] = '-';
          matriz[linp][colp] = '-';
          return 1;
        }
        if (matriz[linp - 1][colp - 1] == '-' && colp - 1 == col - 2 && jogador == 'B') {
          matriz[linp - 1][colp - 1] = jogador;
          matriz[lin][col] = '-';
          matriz[linp][colp] = '-';
          return 1;
        }
        if (matriz[linp + 1][colp + 1] == '-' && colp + 1 == col + 2 && jogador == 'P') {
          matriz[linp + 1][colp + 1] = jogador;
          matriz[lin][col] = '-';
          matriz[linp][colp] = '-';
          return 1;
        }
        if (matriz[linp + 1][colp - 1] == '-' && colp - 1 == col - 2 && jogador == 'P') {
          matriz[linp + 1][colp - 1] = jogador;
          matriz[lin][col] = '-';
          matriz[linp][colp] = '-';
          return 1;
        }
      }
    }
  }
  return -1;
}
```