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54 lines
1.2 KiB
54 lines
1.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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#include <linux/module.h> |
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#include <linux/mm.h> /* for handle_mm_fault() */ |
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#include <linux/ftrace.h> |
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void my_direct_func(struct vm_area_struct *vma, |
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unsigned long address, unsigned int flags) |
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{ |
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trace_printk("handle mm fault vma=%p address=%lx flags=%x\n", |
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vma, address, flags); |
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} |
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extern void my_tramp(void *); |
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asm ( |
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" .pushsection .text, \"ax\", @progbits\n" |
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" .type my_tramp, @function\n" |
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" .globl my_tramp\n" |
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" my_tramp:" |
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" pushq %rbp\n" |
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" movq %rsp, %rbp\n" |
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" pushq %rdi\n" |
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" pushq %rsi\n" |
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" pushq %rdx\n" |
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" call my_direct_func\n" |
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" popq %rdx\n" |
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" popq %rsi\n" |
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" popq %rdi\n" |
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" leave\n" |
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" ret\n" |
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" .size my_tramp, .-my_tramp\n" |
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" .popsection\n" |
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); |
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static int __init ftrace_direct_init(void) |
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{ |
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return register_ftrace_direct((unsigned long)handle_mm_fault, |
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(unsigned long)my_tramp); |
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} |
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static void __exit ftrace_direct_exit(void) |
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{ |
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unregister_ftrace_direct((unsigned long)handle_mm_fault, |
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(unsigned long)my_tramp); |
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} |
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module_init(ftrace_direct_init); |
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module_exit(ftrace_direct_exit); |
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MODULE_AUTHOR("Steven Rostedt"); |
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MODULE_DESCRIPTION("Another example use case of using register_ftrace_direct()"); |
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MODULE_LICENSE("GPL");
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