forked from luck/tmp_suning_uos_patched
277f4ddc36
commit b17c2baa305cccbd16bafa289fd743cc2db77966 upstream. Replace all ret/retq instructions with ASM_RET in preparation of making it more than a single instruction. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lore.kernel.org/r/20211204134907.964635458@infradead.org Signed-off-by: Sasha Levin <sashal@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> [bwh: Backported to 5.10: adjust context] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
// 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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extern void my_direct_func(struct vm_area_struct *vma,
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unsigned long address, unsigned int flags);
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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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ASM_RET
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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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