Function lwp_mmap2

components/lwp/lwp_user_mm.c:551–656

}

void *lwp_mmap2(struct rt_lwp *lwp, void *addr, size_t length, int prot,
                int flags, int fd, off_t pgoffset)
{
    rt_err_t rc;
    rt_size_t k_attr, k_flags, k_offset, aligned_size = 0;
    rt_size_t min_align_size = 1 << MM_PAGE_SHIFT;
    rt_aspace_t uspace;
    rt_mem_obj_t mem_obj;
    void *ret = 0;
    LOG_D("%s(addr=0x%lx,length=0x%lx,fd=%d,pgoff=0x%lx)", __func__, addr, length, fd, pgoffset);

    /* alignment for affinity page block */
    if (flags & MAP_FIXED)
    {
        if (fd != -1)
        {
            /* requested mapping address */
            rt_base_t va_affid = RT_PAGE_PICK_AFFID(addr);
            rt_base_t pgoff_affid = RT_PAGE_PICK_AFFID(pgoffset << MM_PAGE_SHIFT);

            /* filter illegal align address */
            if (va_affid != pgoff_affid)
            {
                LOG_W("Unaligned mapping address %p(pgoff=0x%lx) from fd=%d",
                    addr, pgoffset, fd);
            }
        }
        else
        {
            /* anonymous mapping can always aligned */
        }
    }
    else
    {
        /* weak address selection */
        aligned_size = _aligned_for_weak_mapping(&pgoffset, &length, &min_align_size);
    }

    if (fd == -1)
    {
    #ifdef RT_DEBUGGING_PAGE_THRESHOLD
        if (!_memory_threshold_ok())
            return (void *)-ENOMEM;
    #endif /* RT_DEBUGGING_PAGE_THRESHOLD */

        k_offset = MM_PA_TO_OFF(addr);
        k_flags = MMF_CREATE(lwp_user_mm_flag_to_kernel(flags) | MMF_MAP_PRIVATE,
                             min_align_size);
        k_attr = lwp_user_mm_attr_to_kernel(prot);

        uspace = lwp->aspace;
        length = RT_ALIGN(length, ARCH_PAGE_SIZE);
        mem_obj = _get_mmap_obj(lwp);

        rc = rt_aspace_map(uspace, &addr, length, k_attr, k_flags, mem_obj, k_offset);
        if (rc == RT_EOK)
        {
            ret = addr;