user: What is the c source code of the assembly code below?

```asm
<gsa_walk>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x68,%rsp
  mov    %rdi,-0x58(%rbp)
  mov    %esi,-0x5c(%rbp)
  mov    %edx,-0x60(%rbp)
  mov    %rcx,-0x68(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x18(%rbp)
  xor    %eax,%eax
  mov    -0x5c(%rbp),%ebx
  movslq %ebx,%rax
  sub    $0x1,%rax
  mov    %rax,-0x28(%rbp)
  movslq %ebx,%rax
  mov    %rax,%r8
  mov    $0x0,%r9d
  mov    -0x5c(%rbp),%eax
  imul   %eax,%eax
  cltq
  shl    $0x2,%eax
  mov    %eax,%edi
  call   <malloc@plt>
  mov    %rax,-0x20(%rbp)
  cmpl   $0x0,-0x5c(%rbp)
  jle    L52
  cmpl   $0x0,-0x60(%rbp)
  jle    L52
  mov    $0x1,%eax
  jmp    L31
L52:
  mov    $0x0,%eax
L31:
  mov    %eax,%edi
  call   <assert@plt>
  cmpq   $0x0,-0x20(%rbp)
  jne    L128
  lea    D17(%rip),%rax
  mov    %rax,%rdi
  call   <perror@plt>
  mov    $0x0,%eax
  call   <abort@plt>
L128:
  movl   $0x0,-0x3c(%rbp)
  jmp    L92
L57:
  movl   $0x0,-0x38(%rbp)
  jmp    L71
L79:
  mov    -0x3c(%rbp),%eax
  movslq %eax,%rdx
  movslq %ebx,%rax
  imul   %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rax,%rdx
  mov    -0x38(%rbp),%eax
  cltq
  movl   $0x0,(%rdx,%rax,4)
  addl   $0x1,-0x38(%rbp)
L71:
  mov    -0x38(%rbp),%eax
  cmp    -0x5c(%rbp),%eax
  jl     L79
  addl   $0x1,-0x3c(%rbp)
L92:
  mov    -0x3c(%rbp),%eax
  cmp    -0x5c(%rbp),%eax
  jl     L57
  movl   $0x1,-0x34(%rbp)
  mov    -0x5c(%rbp),%eax
  mov    %eax,%edx
  shr    $0x1f,%edx
  add    %edx,%eax
  sar    %eax
  mov    %eax,-0x44(%rbp)
  mov    -0x44(%rbp),%eax
  mov    %eax,-0x48(%rbp)
  mov    -0x48(%rbp),%eax
  movslq %eax,%rdx
  movslq %ebx,%rax
  imul   %rdx,%rax
  lea    0x0(,%rax,4),%rdx
  mov    -0x20(%rbp),%rax
  add    %rax,%rdx
  mov    -0x44(%rbp),%eax
  cltq
  movl   $0x1,(%rdx,%rax,4)
  movl   $0x0,-0x40(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x30(%rbp)
  jmp    L6
L8:
  cmpq   $0x0,-0x58(%rbp)
  je     L69
  mov    -0x44(%rbp),%ecx
  mov    -0x48(%rbp),%edx
  mov    -0x58(%rbp),%rax
  lea    D11(%rip),%rsi
  mov    %rax,%rdi
  call   <fprintf@plt>
L69:
  mov    -0x5c(%rbp),%eax
  mov    %eax,%edx
  shr    $0x1f,%edx
  add    %edx,%eax
  sar    %eax
  neg    %eax
  mov    %eax,%edx
  mov    -0x48(%rbp),%eax
  add    %edx,%eax
  mov    $0x2,%esi
  mov    %eax,%edi
  call   <pow@plt>
  mov    %rax,%rbx
  mov    -0x5c(%rbp),%eax
  mov    %eax,%edx
  shr    $0x1f,%edx
  add    %edx,%eax
  sar    %eax
  neg    %eax
  mov    %eax,%edx
  mov    -0x44(%rbp),%eax
  add    %edx,%eax
  mov    $0x2,%esi
  mov    %eax,%edi
  call   <pow@plt>
  add    %rbx,%rax
  pxor   %xmm0,%xmm0
  cvtsi2sd %rax,%xmm0
  movsd  -0x30(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x30(%rbp)
  lea    -0x44(%rbp),%rcx
  lea    -0x48(%rbp),%rdx
  mov    -0x5c(%rbp),%esi
  mov    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <take_next_step@plt>
  mov    %eax,-0x34(%rbp)
  addl   $0x1,-0x40(%rbp)
L6:
  cmpl   $0x0,-0x34(%rbp)
  je     L5
  mov    -0x40(%rbp),%eax
  cmp    -0x60(%rbp),%eax
  jl     L8
L5:
  cmpq   $0x0,-0x68(%rbp)
  je     L47
  pxor   %xmm1,%xmm1
  cvtsi2sdl -0x40(%rbp),%xmm1
  movsd  -0x30(%rbp),%xmm0
  divsd  %xmm1,%xmm0
  mov    -0x68(%rbp),%rax
  movsd  %xmm0,(%rax)
L47:
  mov    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    -0x40(%rbp),%eax
  mov    -0x18(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L127
  call   <__stack_chk_fail@plt>
L127:
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

tool_calls: name: read_data
arguments: data_tag: D17
type: string
name: read_data
arguments: data_tag: D11
type: string

tool: D17: malloc() lattice

tool: D11: %d %d


assistant: ```c
int gsa_walk(FILE *fout, int dim, int nsteps, double *pdist) {
  bool(*lattice)[dim] = malloc(dim * dim * sizeof(bool));
  int asteps;
  int i, j;
  int last_x, last_y;
  double sum_r2;
  bool alive;
  assert(dim > 0 && nsteps > 0);
  if (lattice == NULL) {
    perror("malloc() lattice");
    abort();
  }
  for (i = 0; i < dim; i++) {
    for (j = 0; j < dim; j++) {
      lattice[i][j] = false;
    }
  }
  alive = true;
  last_x = last_y = dim / 2;
  lattice[last_x][last_y] = true;
  asteps = 0;
  sum_r2 = 0;
  while (alive && asteps < nsteps) {
    if (fout != NULL) {
      fprintf(fout, "%d %d\n", last_x, last_y);
    }
    sum_r2 += pow(last_x - dim / 2, 2) + pow(last_y - dim / 2, 2);
    alive = take_next_step((bool *)lattice, dim, &last_x, &last_y);
    asteps++;
  }
  if (pdist != NULL) {
    *pdist = sum_r2 / asteps;
  }
  free(lattice);
  return asteps;
}
```