ylfeng/ReF-Decompile-dataset huggingface dataset:
user: What is the c source code of the assembly code below:

```asm
<d_rep_mat>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %edi,-0x14(%rbp)
  mov    %esi,-0x18(%rbp)
  mov    %edx,-0x1c(%rbp)
  mov    %rcx,-0x28(%rbp)
  mov    %r8d,-0x20(%rbp)
  mov    %r9,-0x30(%rbp)
  movl   $0x0,-0x4(%rbp)
  jmp    L39
L1:
  movl   $0x0,-0x8(%rbp)
  jmp    L40
L48:
  movl   $0x0,-0xc(%rbp)
  jmp    L55
L14:
  mov    -0x8(%rbp),%eax
  imul   -0x20(%rbp),%eax
  mov    %eax,%edx
  mov    -0xc(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x28(%rbp),%rax
  add    %rax,%rdx
  mov    -0x8(%rbp),%eax
  imul   0x10(%rbp),%eax
  mov    %eax,%ecx
  mov    -0xc(%rbp),%eax
  add    %eax,%ecx
  mov    -0x4(%rbp),%eax
  imul   -0x18(%rbp),%eax
  imul   -0x1c(%rbp),%eax
  add    %ecx,%eax
  cltq
  lea    0x0(,%rax,8),%rcx
  mov    -0x30(%rbp),%rax
  add    %rcx,%rax
  movsd  (%rdx),%xmm0
  movsd  %xmm0,(%rax)
  addl   $0x1,-0xc(%rbp)
L55:
  mov    -0xc(%rbp),%eax
  cmp    -0x18(%rbp),%eax
  jl     L14
  addl   $0x1,-0x8(%rbp)
L40:
  mov    -0x8(%rbp),%eax
  cmp    -0x1c(%rbp),%eax
  jl     L48
  addl   $0x1,-0x4(%rbp)
L39:
  mov    -0x4(%rbp),%eax
  cmp    -0x14(%rbp),%eax
  jl     L1
  nop
  nop
  pop    %rbp
  ret
```

assistant: ```c
void d_rep_mat(int reps, int row, int col, double *A, int lda, double *B, int ldb) {
  int i, j, l;
  for (l = 0; l < reps; l++) {
    for (j = 0; j < col; j++) {
      for (i = 0; i < row; i++) {
        B[i + j * ldb + l * row * col] = A[i + j * lda];
      }
    }
  }
}
```
user: 请显示与下面列出的汇编代码相匹配的C语言实现：

```asm
<d_rep_mat>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %edi,-0x4(%rsp)
  test   %edi,%edi
  jle    L68
  mov    %esi,%r11d
  mov    %edx,%r10d
  mov    %rcx,%r12
  mov    %r8d,%ebx
  mov    %r9,%r13
  mov    %edx,%eax
  imul   %esi,%eax
  mov    %eax,-0x8(%rsp)
  mov    $0x0,%r15d
  mov    $0x0,%r14d
  mov    %esi,%esi
  jmp    L14
L41:
  movslq %r8d,%rax
  lea    (%r12,%rax,8),%rcx
  movslq %r9d,%rax
  add    %rbp,%rax
  lea    0x0(%r13,%rax,8),%rdx
  mov    $0x0,%eax
L10:
  movsd  (%rcx,%rax,8),%xmm0
  movsd  %xmm0,(%rdx,%rax,8)
  add    $0x1,%rax
  cmp    %rsi,%rax
  jne    L10
L67:
  add    $0x1,%edi
  add    %ebx,%r8d
  add    0x38(%rsp),%r9d
  cmp    %edi,%r10d
  je     L61
L35:
  test   %r11d,%r11d
  jg     L41
  jmp    L67
L61:
  add    $0x1,%r14d
  add    -0x8(%rsp),%r15d
  cmp    %r14d,-0x4(%rsp)
  je     L68
L14:
  test   %r10d,%r10d
  jle    L61
  mov    $0x0,%r9d
  mov    $0x0,%r8d
  mov    $0x0,%edi
  movslq %r15d,%rbp
  jmp    L35
L68:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void d_rep_mat(int reps, int row, int col, double *A, int lda, double *B, int ldb) {
  int i, j, l;
  for (l = 0; l < reps; l++) {
    for (j = 0; j < col; j++) {
      for (i = 0; i < row; i++) {
        B[i + j * ldb + l * row * col] = A[i + j * lda];
      }
    }
  }
}
```
user: Translate the below assembly code into C programming language:

```asm
<d_rep_mat>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    0x38(%rsp),%r12d
  mov    %edi,-0x4(%rsp)
  test   %edi,%edi
  jle    L55
  mov    %edx,%eax
  movl   $0x0,-0xc(%rsp)
  mov    %esi,%ebx
  mov    %edx,%r11d
  imul   %esi,%eax
  mov    %rcx,%r13
  mov    %r8d,%ebp
  mov    %r9,%r15
  movl   $0x0,-0x10(%rsp)
  lea    -0x1(%rsi),%edi
  mov    %eax,-0x8(%rsp)
  nopl   0x0(%rax)
L1:
  test   %r11d,%r11d
  jle    L52
  movslq -0xc(%rsp),%r14
  xor    %r10d,%r10d
  xor    %r9d,%r9d
  xor    %r8d,%r8d
  nopl   0x0(%rax,%rax,1)
L2:
  test   %ebx,%ebx
  jle    L22
  movslq %r9d,%rax
  lea    0x0(%r13,%rax,8),%rsi
  movslq %r10d,%rax
  add    %r14,%rax
  lea    (%r15,%rax,8),%rcx
  xor    %eax,%eax
L47:
  movsd  (%rsi,%rax,8),%xmm0
  mov    %rax,%rdx
  movsd  %xmm0,(%rcx,%rax,8)
  add    $0x1,%rax
  cmp    %rdx,%rdi
  jne    L47
L22:
  add    $0x1,%r8d
  add    %ebp,%r9d
  add    %r12d,%r10d
  cmp    %r8d,%r11d
  jne    L2
L52:
  addl   $0x1,-0x10(%rsp)
  mov    -0x8(%rsp),%esi
  mov    -0x10(%rsp),%eax
  add    %esi,-0xc(%rsp)
  cmp    %eax,-0x4(%rsp)
  jne    L1
L55:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void d_rep_mat(int reps, int row, int col, double *A, int lda, double *B, int ldb) {
  int i, j, l;
  for (l = 0; l < reps; l++) {
    for (j = 0; j < col; j++) {
      for (i = 0; i < row; i++) {
        B[i + j * ldb + l * row * col] = A[i + j * lda];
      }
    }
  }
}
```
user: 请显示与下面列出的汇编代码相匹配的C语言实现:

```asm
<d_rep_mat>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  mov    %edi,-0xc(%rsp)
  mov    %esi,-0x18(%rsp)
  mov    %edx,-0x20(%rsp)
  test   %edi,%edi
  jle    L80
  test   %edx,%edx
  jle    L80
  mov    %esi,%edi
  test   %esi,%esi
  jle    L80
  mov    %esi,%eax
  imul   %esi,%edx
  movslq 0x38(%rsp),%r14
  movslq %r8d,%r15
  shr    %eax
  movl   $0x0,-0x14(%rsp)
  and    $0xfffffffe,%esi
  mov    %r9,%r11
  lea    -0x1(%rax),%ebx
  lea    -0x1(%rdi),%eax
  mov    %rcx,%r10
  mov    %r8d,%r13d
  mov    %eax,-0x1c(%rsp)
  add    $0x1,%rbx
  shl    $0x3,%r15
  xor    %r9d,%r9d
  mov    %edx,-0x10(%rsp)
  shl    $0x3,%r14
  shl    $0x4,%rbx
  mov    %esi,%edx
  mov    %edi,%r12d
  nopl   (%rax)
L102:
  movslq %r9d,%rax
  mov    %r10,%rsi
  xor    %r8d,%r8d
  xor    %edi,%edi
  lea    (%r11,%rax,8),%rcx
  xor    %ebp,%ebp
  nopl   0x0(%rax)
L30:
  lea    0x8(%rsi),%rax
  cmp    %rax,%rcx
  je     L0
  xor    %eax,%eax
  cmpl   $0x2,-0x1c(%rsp)
  jbe    L0
  nopw   0x0(%rax,%rax,1)
L52:
  movupd (%rsi,%rax,1),%xmm1
  movups %xmm1,(%rcx,%rax,1)
  add    $0x10,%rax
  cmp    %rbx,%rax
  jne    L52
  cmp    -0x18(%rsp),%edx
  je     L20
  lea    (%rdi,%rdx,1),%eax
  cltq
  movsd  (%r10,%rax,8),%xmm0
  lea    (%r8,%rdx,1),%eax
  add    %r9d,%eax
  cltq
  movsd  %xmm0,(%r11,%rax,8)
L20:
  add    $0x1,%ebp
  add    %r15,%rsi
  add    %r14,%rcx
  add    %r13d,%edi
  add    0x38(%rsp),%r8d
  cmp    %ebp,-0x20(%rsp)
  jne    L30
  addl   $0x1,-0x14(%rsp)
  add    -0x10(%rsp),%r9d
  mov    -0x14(%rsp),%eax
  cmp    %eax,-0xc(%rsp)
  jne    L102
L80:
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   0x0(%rax)
L0:
  xor    %eax,%eax
  nopw   0x0(%rax,%rax,1)
L44:
  movsd  (%rsi,%rax,8),%xmm0
  movsd  %xmm0,(%rcx,%rax,8)
  add    $0x1,%rax
  cmp    %rax,%r12
  jne    L44
  jmp    L20
```

assistant: ```c
void d_rep_mat(int reps, int row, int col, double *A, int lda, double *B, int ldb) {
  int i, j, l;
  for (l = 0; l < reps; l++) {
    for (j = 0; j < col; j++) {
      for (i = 0; i < row; i++) {
        B[i + j * ldb + l * row * col] = A[i + j * lda];
      }
    }
  }
}
```
user: 提供的汇编代码用C语言表示会是什么样子:

```asm
<ether_aton>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x20,%rsp
  mov    %rdi,-0x18(%rbp)
  mov    -0x18(%rbp),%rax
  mov    %rax,-0x8(%rbp)
  movl   $0x0,-0xc(%rbp)
  mov    $0x18,%edx
  mov    $0x0,%esi
  lea    D51(%rip),%rax
  mov    %rax,%rdi
  call   <memset@plt>
  mov    -0x18(%rbp),%rax
  mov    %rax,-0x8(%rbp)
  jmp    L115
L98:
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x2f,%al
  jle    L72
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x39,%al
  jle    L128
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x40,%al
  jle    L72
L128:
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x46,%al
  jle    L89
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x60,%al
  jle    L72
L89:
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x66,%al
  jle    L21
L72:
  mov    $0x0,%eax
  jmp    L43
L21:
  mov    -0xc(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  lea    D51(%rip),%rax
  mov    (%rdx,%rax,1),%eax
  cmp    $0xf,%eax
  jle    L111
  mov    $0x0,%eax
  jmp    L43
L111:
  mov    -0xc(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  lea    D51(%rip),%rax
  mov    (%rdx,%rax,1),%eax
  shl    $0x4,%eax
  mov    %eax,%ecx
  mov    -0xc(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  lea    D51(%rip),%rax
  mov    %ecx,(%rdx,%rax,1)
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  movsbl %al,%eax
  mov    %eax,%edi
  call   <hex2bin@plt>
  mov    %eax,%ecx
  mov    -0xc(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  lea    D51(%rip),%rax
  mov    (%rdx,%rax,1),%eax
  or     %eax,%ecx
  mov    -0xc(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  lea    D51(%rip),%rax
  mov    %ecx,(%rdx,%rax,1)
  addq   $0x1,-0x8(%rbp)
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  cmp    $0x3a,%al
  jne    L115
  addl   $0x1,-0xc(%rbp)
  cmpl   $0x5,-0xc(%rbp)
  jle    L68
  mov    $0x0,%eax
  jmp    L43
L68:
  addq   $0x1,-0x8(%rbp)
L115:
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%eax
  test   %al,%al
  jne    L98
  lea    D51(%rip),%rax
L43:
  leave
  ret
```

assistant: ```c
uint8_t *ether_aton(const char *str) {
  static uint8_t mac[6];
  const char *cp = str;
  int n = 0;
  memset(mac, 0, sizeof(mac));
  for (cp = str; *cp;) {
    if (*cp < '0' || (*cp > '9' && *cp < 'A') || (*cp > 'F' && *cp < 'a') || *cp > 'f') {
      return NULL;
    }
    if (mac[n] > 0x0F) {
      return NULL;
    }
    mac[n] <<= 4;
    mac[n] |= hex2bin(*cp);
    cp++;
    if (*cp == ':') {
      n++;
      if (n > 5) {
        return NULL;
      }
      cp++;
    }
  }
  return mac;
}
```
user: What would the C source look like for the assembly code provided here?

```asm
<ether_aton>:
  endbr64
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x8,%rsp
  mov    %rdi,%rbx
  mov    $0x18,%edx
  mov    $0x0,%esi
  lea    D26(%rip),%rdi
  call   <memset@plt>
  movzbl (%rbx),%eax
  test   %al,%al
  je     L51
  mov    $0x0,%r12d
  lea    D26(%rip),%rbp
  jmp    L78
L72:
  add    $0x1,%r12d
  cmp    $0x5,%r12d
  jg     L54
  add    $0x2,%rbx
L101:
  movzbl (%rbx),%eax
  test   %al,%al
  je     L124
L78:
  mov    %eax,%edx
  lea    -0x3a(%rax),%ecx
  cmp    $0x6,%cl
  jbe    L62
  sub    $0x30,%eax
  cmp    $0x36,%al
  ja     L62
  sub    $0x47,%edx
  cmp    $0x19,%dl
  jbe    L36
  movslq %r12d,%rax
  mov    0x0(%rbp,%rax,4),%eax
  cmp    $0xf,%eax
  jg     L131
  movslq %r12d,%r13
  shl    $0x4,%eax
  mov    %eax,0x0(%rbp,%r13,4)
  movsbl (%rbx),%edi
  call   <hex2bin@plt>
  or     %eax,0x0(%rbp,%r13,4)
  cmpb   $0x3a,0x1(%rbx)
  je     L72
  add    $0x1,%rbx
  jmp    L101
L124:
  lea    D26(%rip),%rax
  jmp    L60
L51:
  lea    D26(%rip),%rax
  jmp    L60
L62:
  mov    $0x0,%eax
  jmp    L60
L36:
  mov    $0x0,%eax
L60:
  add    $0x8,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
L131:
  mov    $0x0,%eax
  jmp    L60
L54:
  mov    $0x0,%eax
  jmp    L60
```

assistant: ```c
uint8_t *ether_aton(const char *str) {
  static uint8_t mac[6];
  const char *cp = str;
  int n = 0;
  memset(mac, 0, sizeof(mac));
  for (cp = str; *cp;) {
    if (*cp < '0' || (*cp > '9' && *cp < 'A') || (*cp > 'F' && *cp < 'a') || *cp > 'f') {
      return NULL;
    }
    if (mac[n] > 0x0F) {
      return NULL;
    }
    mac[n] <<= 4;
    mac[n] |= hex2bin(*cp);
    cp++;
    if (*cp == ':') {
      n++;
      if (n > 5) {
        return NULL;
      }
      cp++;
    }
  }
  return mac;
}
```
user: 请显示与下面列出的汇编代码相匹配的C语言实现：

```asm
<ether_aton>:
  endbr64
  push   %r13
  lea    D6(%rip),%r13
  mov    $0x18,%edx
  xor    %esi,%esi
  push   %r12
  mov    %rdi,%r12
  mov    %r13,%rdi
  push   %rbp
  push   %rbx
  sub    $0x8,%rsp
  call   <memset@plt>
  movzbl (%r12),%eax
  test   %al,%al
  je     L83
  xor    %ebp,%ebp
  jmp    L93
  nopl   0x0(%rax)
L81:
  add    $0x1,%r12
  test   %al,%al
  je     L83
L93:
  lea    -0x3a(%rax),%edx
  cmp    $0x6,%dl
  jbe    L78
  lea    -0x30(%rax),%edx
  cmp    $0x36,%dl
  ja     L78
  sub    $0x47,%eax
  cmp    $0x19,%al
  jbe    L78
  movslq %ebp,%rbx
  mov    0x0(%r13,%rbx,4),%eax
  cmp    $0xf,%eax
  jg     L78
  shl    $0x4,%eax
  mov    %eax,0x0(%r13,%rbx,4)
  movsbl (%r12),%edi
  call   <hex2bin@plt>
  or     %eax,0x0(%r13,%rbx,4)
  movzbl 0x1(%r12),%eax
  cmp    $0x3a,%al
  jne    L81
  add    $0x1,%ebp
  cmp    $0x5,%ebp
  jg     L78
  movzbl 0x2(%r12),%eax
  add    $0x2,%r12
  test   %al,%al
  jne    L93
L83:
  add    $0x8,%rsp
  lea    D6(%rip),%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
  nopl   (%rax)
L78:
  add    $0x8,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
```

assistant: ```c
uint8_t *ether_aton(const char *str) {
  static uint8_t mac[6];
  const char *cp = str;
  int n = 0;
  memset(mac, 0, sizeof(mac));
  for (cp = str; *cp;) {
    if (*cp < '0' || (*cp > '9' && *cp < 'A') || (*cp > 'F' && *cp < 'a') || *cp > 'f') {
      return NULL;
    }
    if (mac[n] > 0x0F) {
      return NULL;
    }
    mac[n] <<= 4;
    mac[n] |= hex2bin(*cp);
    cp++;
    if (*cp == ':') {
      n++;
      if (n > 5) {
        return NULL;
      }
      cp++;
    }
  }
  return mac;
}
```
user: Demonstrate the C code that generates the assembly output below:

```asm
<ether_aton>:
  endbr64
  push   %r13
  lea    D3(%rip),%r13
  mov    $0x18,%edx
  xor    %esi,%esi
  push   %r12
  mov    %rdi,%r12
  mov    %r13,%rdi
  push   %rbp
  push   %rbx
  sub    $0x8,%rsp
  call   <memset@plt>
  movzbl (%r12),%eax
  test   %al,%al
  je     L77
  xor    %ebp,%ebp
  jmp    L64
  nopl   0x0(%rax)
L16:
  add    $0x1,%r12
  test   %al,%al
  je     L77
L64:
  lea    -0x3a(%rax),%edx
  cmp    $0x6,%dl
  jbe    L29
  lea    -0x30(%rax),%edx
  cmp    $0x36,%dl
  ja     L29
  sub    $0x47,%eax
  cmp    $0x19,%al
  jbe    L29
  movslq %ebp,%rbx
  mov    0x0(%r13,%rbx,4),%eax
  cmp    $0xf,%eax
  jg     L29
  shl    $0x4,%eax
  mov    %eax,0x0(%r13,%rbx,4)
  movsbl (%r12),%edi
  call   <hex2bin@plt>
  or     %eax,0x0(%r13,%rbx,4)
  movzbl 0x1(%r12),%eax
  cmp    $0x3a,%al
  jne    L16
  add    $0x1,%ebp
  cmp    $0x5,%ebp
  jg     L29
  movzbl 0x2(%r12),%eax
  add    $0x2,%r12
  test   %al,%al
  jne    L64
L77:
  add    $0x8,%rsp
  lea    D3(%rip),%rax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
  nopl   (%rax)
L29:
  add    $0x8,%rsp
  xor    %eax,%eax
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  ret
```

assistant: ```c
uint8_t *ether_aton(const char *str) {
  static uint8_t mac[6];
  const char *cp = str;
  int n = 0;
  memset(mac, 0, sizeof(mac));
  for (cp = str; *cp;) {
    if (*cp < '0' || (*cp > '9' && *cp < 'A') || (*cp > 'F' && *cp < 'a') || *cp > 'f') {
      return NULL;
    }
    if (mac[n] > 0x0F) {
      return NULL;
    }
    mac[n] <<= 4;
    mac[n] |= hex2bin(*cp);
    cp++;
    if (*cp == ':') {
      n++;
      if (n > 5) {
        return NULL;
      }
      cp++;
    }
  }
  return mac;
}
```
user: 请显示与下面列出的汇编代码相匹配的C语言实现：

```asm
<fork_dont_care>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x10,%rsp
  mov    $0x0,%eax
  call   <xfork@plt>
  mov    %eax,-0x4(%rbp)
  cmpl   $0x0,-0x4(%rbp)
  je     L6
  mov    -0x4(%rbp),%eax
  mov    $0x0,%edx
  mov    $0x0,%esi
  mov    %eax,%edi
  call   <waitpid@plt>
  mov    -0x4(%rbp),%eax
  jmp    L25
L6:
  mov    $0x0,%eax
  call   <xfork@plt>
  mov    %eax,-0x4(%rbp)
  cmpl   $0x0,-0x4(%rbp)
  je     L20
  mov    $0x0,%edi
  call   <exit@plt>
L20:
  mov    $0x0,%eax
L25:
  leave
  ret
```

assistant: ```c
int fork_dont_care() {
  int pid = xfork();
  if (pid) {
    waitpid(pid, NULL, 0);
    return pid;
  } else if ((pid = xfork())) {
    exit(0);
  }
  return 0;
}
```
user: Demonstrate the C code that generates the assembly output below:

```asm
<fork_dont_care>:
  endbr64
  push   %rbx
  mov    $0x0,%eax
  call   <xfork@plt>
  mov    %eax,%ebx
  test   %eax,%eax
  jne    L15
  mov    $0x0,%eax
  call   <xfork@plt>
  test   %eax,%eax
  jne    L13
L11:
  pop    %rbx
  ret
L15:
  mov    $0x0,%edx
  mov    $0x0,%esi
  mov    %eax,%edi
  call   <waitpid@plt>
  mov    %ebx,%eax
  jmp    L11
L13:
  mov    $0x0,%edi
  call   <exit@plt>
  mov    %ebx,%eax
  jmp    L11
```

assistant: ```c
int fork_dont_care() {
  int pid = xfork();
  if (pid) {
    waitpid(pid, NULL, 0);
    return pid;
  } else if ((pid = xfork())) {
    exit(0);
  }
  return 0;
}
```
user: Demonstrate the C code that generates the assembly output below:

```asm
<fork_dont_care>:
  endbr64
  push   %rbx
  xor    %eax,%eax
  call   <xfork@plt>
  test   %eax,%eax
  jne    L12
  xor    %eax,%eax
  call   <xfork@plt>
  test   %eax,%eax
  jne    L8
  pop    %rbx
  ret
  nopl   (%rax)
L8:
  xor    %edi,%edi
  call   <exit@plt>
  xor    %eax,%eax
  pop    %rbx
  ret
  nopl   0x0(%rax,%rax,1)
L12:
  mov    %eax,%ebx
  xor    %edx,%edx
  xor    %esi,%esi
  mov    %eax,%edi
  call   <waitpid@plt>
  mov    %ebx,%eax
  pop    %rbx
  ret
```

assistant: ```c
int fork_dont_care() {
  int pid = xfork();
  if (pid) {
    waitpid(pid, NULL, 0);
    return pid;
  } else if ((pid = xfork())) {
    exit(0);
  }
  return 0;
}
```
user: 下面的汇编指令对应的C源代码是什么：

```asm
<fork_dont_care>:
  endbr64
  push   %rbx
  xor    %eax,%eax
  call   <xfork@plt>
  test   %eax,%eax
  jne    L17
  xor    %eax,%eax
  call   <xfork@plt>
  test   %eax,%eax
  jne    L7
  pop    %rbx
  ret
  nopl   (%rax)
L7:
  xor    %edi,%edi
  call   <exit@plt>
  xor    %eax,%eax
  pop    %rbx
  ret
  nopl   0x0(%rax,%rax,1)
L17:
  mov    %eax,%ebx
  xor    %edx,%edx
  xor    %esi,%esi
  mov    %eax,%edi
  call   <waitpid@plt>
  mov    %ebx,%eax
  pop    %rbx
  ret
```

assistant: ```c
int fork_dont_care() {
  int pid = xfork();
  if (pid) {
    waitpid(pid, NULL, 0);
    return pid;
  } else if ((pid = xfork())) {
    exit(0);
  }
  return 0;
}
```
user: 请显示与下面列出的汇编代码相匹配的C语言实现：

```asm
<send_fd>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x78,%rsp
  mov    %edi,-0x94(%rbp)
  mov    %esi,-0x98(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  mov    %rsp,%rax
  mov    %rax,%rbx
  movq   $0x0,-0x50(%rbp)
  movq   $0x0,-0x48(%rbp)
  movq   $0x0,-0x40(%rbp)
  mov    $0x4,%edi
  call   <CMSG_SPACE@plt>
  mov    %eax,%ecx
  movslq %ecx,%rax
  sub    $0x1,%rax
  mov    %rax,-0x80(%rbp)
  movslq %ecx,%rax
  mov    %rax,%r14
  mov    $0x0,%r15d
  movslq %ecx,%rax
  mov    %rax,%r12
  mov    $0x0,%r13d
  movslq %ecx,%rax
  mov    $0x10,%edx
  sub    $0x1,%rdx
  add    %rdx,%rax
  mov    $0x10,%edi
  mov    $0x0,%edx
  div    %rdi
  imul   $0x10,%rax,%rax
  mov    %rax,%rsi
  and    $0xfffffffffffff000,%rsi
  mov    %rsp,%rdx
  sub    %rsi,%rdx
L44:
  cmp    %rdx,%rsp
  je     L51
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L44
L51:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L26
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L26:
  mov    %rsp,%rax
  add    $0x0,%rax
  mov    %rax,-0x78(%rbp)
  movb   $0x0,-0x81(%rbp)
  mov    -0x78(%rbp),%rax
  mov    %rax,-0x50(%rbp)
  mov    %ecx,-0x48(%rbp)
  lea    -0x50(%rbp),%rax
  mov    %rax,%rdi
  call   <CMSG_FIRSTHDR@plt>
  mov    %rax,-0x70(%rbp)
  mov    D19(%rip),%rax
  mov    (%rax),%edx
  mov    -0x70(%rbp),%rax
  mov    %edx,0x8(%rax)
  mov    D13(%rip),%rax
  mov    (%rax),%edx
  mov    -0x70(%rbp),%rax
  mov    %edx,0x4(%rax)
  mov    $0x4,%edi
  call   <CMSG_LEN@plt>
  mov    -0x70(%rbp),%rdx
  mov    %eax,(%rdx)
  mov    -0x70(%rbp),%rax
  mov    %rax,%rdi
  call   <CMSG_DATA@plt>
  mov    %rax,-0x68(%rbp)
  mov    -0x68(%rbp),%rax
  mov    -0x98(%rbp),%edx
  mov    %edx,(%rax)
  lea    -0x60(%rbp),%rax
  mov    %rax,-0x40(%rbp)
  movl   $0x1,-0x44(%rbp)
  lea    -0x81(%rbp),%rax
  mov    %rax,-0x60(%rbp)
  movl   $0x1,-0x58(%rbp)
  lea    -0x50(%rbp),%rcx
  mov    -0x94(%rbp),%eax
  mov    $0x0,%edx
  mov    %rcx,%rsi
  mov    %eax,%edi
  call   <sendmsg@plt>
  test   %rax,%rax
  jg     L10
  mov    $0xffffffff,%eax
  jmp    L20
L10:
  mov    $0x0,%eax
L20:
  mov    %rbx,%rsp
  mov    -0x38(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L16
  call   <__stack_chk_fail@plt>
L16:
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
```

assistant: ```c
int send_fd(int via, int fd) {
  struct msghdr h = {};
  struct cmsghdr *ch;
  struct iovec iov;
  char buf[CMSG_SPACE(sizeof(int))], c = '\0';
  int *fdp;
  h.msg_control = buf;
  h.msg_controllen = sizeof(buf);
  ch = CMSG_FIRSTHDR(&h);
  ch->cmsg_level = SOL_SOCKET;
  ch->cmsg_type = SCM_RIGHTS;
  ch->cmsg_len = CMSG_LEN(sizeof(int));
  fdp = (int *)CMSG_DATA(ch);
  *fdp = fd;
  h.msg_iov = &iov;
  h.msg_iovlen = 1;
  iov.iov_base = &c;
  iov.iov_len = sizeof(c);
  if (sendmsg(via, &h, 0) <= 0)
    return -1;
  return 0;
}
```
user: 请将这段汇编代码片段转换成等效的C代码：

```asm
<send_fd>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x40,%rsp
  mov    %edi,%ebx
  mov    %esi,%r12d
  mov    %fs:0x28,%rax
  mov    %rax,-0x28(%rbp)
  xor    %eax,%eax
  movq   $0x0,-0x40(%rbp)
  movq   $0x0,-0x38(%rbp)
  movq   $0x0,-0x30(%rbp)
  mov    $0x4,%edi
  call   <CMSG_SPACE@plt>
  movslq %eax,%rdx
  add    $0xf,%rdx
  mov    %rdx,%rsi
  and    $0xfffffffffffffff0,%rsi
  and    $0xfffffffffffff000,%rdx
  mov    %rsp,%rcx
  sub    %rdx,%rcx
L28:
  cmp    %rcx,%rsp
  je     L11
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L28
L11:
  mov    %rsi,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  test   %rdx,%rdx
  je     L12
  orq    $0x0,-0x8(%rsp,%rdx,1)
L12:
  movb   $0x0,-0x51(%rbp)
  mov    %rsp,-0x40(%rbp)
  mov    %eax,-0x38(%rbp)
  lea    -0x40(%rbp),%r14
  mov    %r14,%rdi
  call   <CMSG_FIRSTHDR@plt>
  mov    %rax,%r13
  mov    D2(%rip),%rax
  mov    (%rax),%eax
  mov    %eax,0x8(%r13)
  mov    D17(%rip),%rax
  mov    (%rax),%eax
  mov    %eax,0x4(%r13)
  mov    $0x4,%edi
  call   <CMSG_LEN@plt>
  mov    %eax,0x0(%r13)
  mov    %r13,%rdi
  call   <CMSG_DATA@plt>
  mov    %r12d,(%rax)
  lea    -0x50(%rbp),%rax
  mov    %rax,-0x30(%rbp)
  movl   $0x1,-0x34(%rbp)
  lea    -0x51(%rbp),%rax
  mov    %rax,-0x50(%rbp)
  movl   $0x1,-0x48(%rbp)
  mov    $0x0,%edx
  mov    %r14,%rsi
  mov    %ebx,%edi
  call   <sendmsg@plt>
  test   %rax,%rax
  setle  %al
  movzbl %al,%eax
  neg    %eax
  mov    -0x28(%rbp),%rdx
  sub    %fs:0x28,%rdx
  jne    L15
  lea    -0x20(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %rbp
  ret
L15:
  call   <__stack_chk_fail@plt>
```

assistant: ```c
int send_fd(int via, int fd) {
  struct msghdr h = {};
  struct cmsghdr *ch;
  struct iovec iov;
  char buf[CMSG_SPACE(sizeof(int))], c = '\0';
  int *fdp;
  h.msg_control = buf;
  h.msg_controllen = sizeof(buf);
  ch = CMSG_FIRSTHDR(&h);
  ch->cmsg_level = SOL_SOCKET;
  ch->cmsg_type = SCM_RIGHTS;
  ch->cmsg_len = CMSG_LEN(sizeof(int));
  fdp = (int *)CMSG_DATA(ch);
  *fdp = fd;
  h.msg_iov = &iov;
  h.msg_iovlen = 1;
  iov.iov_base = &c;
  iov.iov_len = sizeof(c);
  if (sendmsg(via, &h, 0) <= 0)
    return -1;
  return 0;
}
```