函数逻辑报告 |
Source Code:mm\mmap.c |
Create Date:2022-07-27 16:17:19 |
| Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
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函数名称：This mmap-allocator allocates new areas top-down from below the* stack's low limit (the base):
函数原型：unsigned long arch_get_unmapped_area_topdown(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags)
返回类型：unsigned long
参数：
| 类型 | 参数 | 名称 |
|---|---|---|
| struct file * | filp | |
| unsigned long | addr | |
| unsigned long | len | |
| unsigned long | pgoff | |
| unsigned long | flags |
| 2124 | mmap_end等于arch_get_mmap_end(addr) |
| 2127 | 如果len大于mmap_end减mmap_min_addr则返回:负ENOMEM |
| 2130 | 如果flags按位与Interpret addr exactly 则返回:addr |
| 2134 | 如果addr则 |
| 2137 | 如果mmap_end减len大于等于addr且addr大于等于mmap_min_addr且非vma或addr加len小于等于vm_start_gap(vma)的值且非prev或addr大于等于vm_end_gap(prev)的值则返回:addr |
| 2145 | low_limit等于两数取大(PAGE_SIZE, mmap_min_addr) |
| 2147 | align_mask等于0 |
| 2156 | 如果offset_in_page(addr)则 |
| 2164 | 返回:addr |
| 源代码转换工具 开放的插件接口 | X |
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