Function report |
Source Code:kernel\events\uprobes.c |
Create Date:2022-07-28 13:46:24 |
| Last Modify:2020-03-12 14:18:49 | Copyright©Brick |
| home page | Tree |
| Annotation kernel can get tool activity | Download SCCT | Chinese |
Name:prepare_uretprobe
Proto:static void prepare_uretprobe(struct uprobe *uprobe, struct pt_regs *regs)
Type:void
Parameter:
| Type | Parameter | Name |
|---|---|---|
| struct uprobe * | uprobe | |
| struct pt_regs * | regs |
| 1869 | If Not get_xol_area - Allocate process's xol_area if necessary.* This area will be used for storing instructions for execution out of line.* Returns the allocated area or NULL. Then Return |
| 1872 | utask = Allocate a uprobe_task object for the task if if necessary.* Called when the thread hits a breakpoint.* Returns:* - pointer to new uprobe_task on success* - NULL otherwise |
| 1873 | If Not utask Then Return |
| 1876 | If depth >= MAX_URETPROBE_DEPTH Then |
| 1877 | atelimited messages with local ratelimit_state,* no local ratelimit_state used in the !PRINTK case(formational "uprobe: omit uretprobe due to nestedness limit pid/tgid=%d/%d\n", pid, tgid) |
| 1880 | Return |
| 1883 | ri = Allocation memory |
| 1884 | If Not ri Then Return |
| 1887 | trampoline_vaddr = Current area->vaddr notion assume the trampoline address is always* equal area->vaddr.* Returns -1 in case the xol_area is not allocated. |
| 1889 | If orig_ret_vaddr == -1 Then Go to fail |
| 1893 | chained = orig_ret_vaddr == trampoline_vaddr |
| 1894 | cleanup_return_instances(utask, chained, regs) |
| 1901 | If chained Then |
| 1902 | If Not return_instances Then |
| 1907 | uprobe_warn(current process, "handle tail call") |
| 1908 | Go to fail |
| 1913 | uprobe = get_uprobe(uprobe) |
| 1914 | func = instruction_pointer(regs) |
| 1915 | stack pointer = user_stack_pointer(regs) |
| 1919 | depth++ |
| 1920 | keep as stack = return_instances |
| 1921 | return_instances = ri |
| 1923 | Return |
| 1924 | fail : |
| Name | Describe |
|---|---|
| handler_chain |
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