user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<vga_mode>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %rdi,-0x28(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  lea    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <FS460_get_vga_mode@plt>
  mov    %eax,-0x1c(%rbp)
  cmpl   $0x0,-0x1c(%rbp)
  je     L11
  mov    -0x1c(%rbp),%eax
  mov    %eax,%esi
  lea    D59(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  jmp    L129
L11:
  lea    -0x10(%rbp),%rax
  mov    %rax,%rdi
  call   <FS460_get_available_vga_modes@plt>
  mov    %eax,-0x1c(%rbp)
  cmpl   $0x0,-0x1c(%rbp)
  je     L105
  mov    -0x1c(%rbp),%eax
  mov    %eax,%esi
  lea    D52(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  jmp    L129
L105:
  mov    -0x10(%rbp),%rax
  test   %rax,%rax
  je     L129
  mov    -0x28(%rbp),%rax
  lea    D83(%rip),%rdx
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcmp@plt>
  test   %rax,%rax
  jne    L9
L81:
  mov    -0x18(%rbp),%rax
  add    %rax,%rax
  mov    %rax,-0x18(%rbp)
  mov    -0x18(%rbp),%rax
  test   %rax,%rax
  jne    L118
  movq   $0x1,-0x18(%rbp)
L118:
  mov    -0x18(%rbp),%rdx
  mov    -0x10(%rbp),%rax
  and    %rdx,%rax
  test   %rax,%rax
  je     L81
  jmp    L49
L9:
  mov    -0x28(%rbp),%rax
  lea    D46(%rip),%rdx
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcmp@plt>
  test   %rax,%rax
  jne    L62
L124:
  mov    -0x18(%rbp),%rax
  shr    %rax
  mov    %rax,-0x18(%rbp)
  mov    -0x18(%rbp),%rax
  test   %rax,%rax
  jne    L153
  mov    $0x80000000,%eax
  mov    %rax,-0x18(%rbp)
L153:
  mov    -0x18(%rbp),%rdx
  mov    -0x10(%rbp),%rax
  and    %rdx,%rax
  test   %rax,%rax
  je     L124
  jmp    L49
L62:
  mov    -0x28(%rbp),%rax
  lea    D48(%rip),%rdx
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <strcmp@plt>
  test   %rax,%rax
  je     L49
  lea    D61(%rip),%rax
  mov    %rax,%rdi
  call   <puts@plt>
  jmp    L129
L49:
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <FS460_set_vga_mode@plt>
  mov    %eax,-0x1c(%rbp)
  cmpl   $0x0,-0x1c(%rbp)
  je     L30
  mov    -0x1c(%rbp),%eax
  mov    %eax,%esi
  lea    D63(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  jmp    L129
L30:
  lea    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <FS460_get_vga_mode@plt>
  mov    %eax,-0x1c(%rbp)
  cmpl   $0x0,-0x1c(%rbp)
  je     L111
  mov    -0x1c(%rbp),%eax
  mov    %eax,%esi
  lea    D20(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
  jmp    L129
L111:
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <str_VgaMode@plt>
  mov    %rax,%rsi
  lea    D69(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <printf@plt>
L129:
  mov    -0x8(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L92
  call   <__stack_chk_fail@plt>
L92:
  leave
  ret
```

tool_calls: name: disassemble_data
arguments: data_label: D59
type_guessed: string
name: disassemble_data
arguments: data_label: D52
type_guessed: string
name: disassemble_data
arguments: data_label: D83
type_guessed: string
name: disassemble_data
arguments: data_label: D46
type_guessed: string
name: disassemble_data
arguments: data_label: D48
type_guessed: string
name: disassemble_data
arguments: data_label: D61
type_guessed: string
name: disassemble_data
arguments: data_label: D63
type_guessed: string
name: disassemble_data
arguments: data_label: D20
type_guessed: string
name: disassemble_data
arguments: data_label: D69
type_guessed: string

tool: D59: error %u getting vga mode.


tool: D52: error %u getting available vga modes.


tool: D83: +

tool: D46: -

tool: 

tool: D61: Invalid command.

tool: D63: error %u setting vga mode.


tool: D20: error %u getting vga mode after set.


tool: D69:   vga mode=%s


assistant: ```c
void vga_mode(char *mod) {
  int err;
  unsigned long vga_mode, available_vga_modes;
  err = FS460_get_vga_mode(&vga_mode);
  if (err) {
    printf("error %u getting vga mode.\n", err);
    return;
  }
  err = FS460_get_available_vga_modes(&available_vga_modes);
  if (err) {
    printf("error %u getting available vga modes.\n", err);
    return;
  }
  if (available_vga_modes) {
    if (0 == strcmp(mod, "+")) {
      do {
        vga_mode <<= 1;
        if (!vga_mode)
          vga_mode = 1;
      } while (!(vga_mode & available_vga_modes));
    } else if (0 == strcmp(mod, "-")) {
      do {
        vga_mode >>= 1;
        if (!vga_mode)
          vga_mode = 0x80000000;
      } while (!(vga_mode & available_vga_modes));
    } else if (0 == strcmp(mod, "")) {
    } else {
      printf("Invalid command.\n");
      return;
    }
    err = FS460_set_vga_mode(vga_mode);
    if (err)
      printf("error %u setting vga mode.\n", err);
    else {
      err = FS460_get_vga_mode(&vga_mode);
      if (err)
        printf("error %u getting vga mode after set.\n", err);
      else
        printf("  vga mode=%s\n", str_VgaMode(vga_mode));
    }
  }
}
```