On Fri, Apr 26, 2002 at 07:30:28AM +0200, Emmanuel Dreyfus wrote:
> > Uh, did you by any chance forget to allocate VM in that range?
> 
> Here is the code. Is there something wrong in VM allocation?
> 
>         bsd_flags = FORK_SHAREVM;
>         tf = (struct frame *)p->p_md.md_regs;
> 
>         child_stack_addr = (u_long)(tf->f_regs[SP] - IRIX_SPROC_STACK_OFFSET);
>         child_stack_size = (u_long)p->p_vmspace->vm_minsaddr
>             - (u_long)p->p_vmspace->vm_maxsaddr;

Aren't they reversed?


> 
>         error = fork1(p, bsd_flags, SIGCHLD, (void *)child_stack_addr,
>             child_stack_size, NULL, NULL, retval, &p2);
>         if (error)
>                 return error;
> 
>         tf = (struct frame *)p2->p_md.md_regs;
> 
>         tf->f_regs[PC] = (unsigned long)SCARG(uap, entry);
> 
>         tf->f_regs[A0] = (unsigned long)SCARG(uap, arg);
>         tf->f_regs[A1] = tf->f_regs[S3]; /* XXX ? */
> 
>         bzero(&vmc, sizeof(vmc));
>         vmc.ev_addr = trunc_page(child_stack_addr - child_stack_size);
>         vmc.ev_len = round_page(child_stack_size);
>         vmc.ev_prot = UVM_PROT_RWX;
>         vmc.ev_flags = UVM_FLAG_COPYONW|UVM_FLAG_FIXED|UVM_FLAG_OVERLAY;
>         vmc.ev_proc = vmcmd_map_zero;
>         error = (*vmc.ev_proc)(p, &vmc);
> 
>         retval[0] = (register_t)p2->p_pid;
>         retval[1] = 0;
> 
>         return error;
> 
> -- 
> Emmanuel Dreyfus.
> "Le 80x86 n'est pas si complexe - il n'a simplement pas de sens"
> (Mike Johnson, responsable de la conception x86 chez AMD) 
> manu@netbsd.org