7b0a096436
This is an adaptation of commitf3a112c0c4("x86,rethook,kprobes: Replace kretprobe with rethook on x86") and commitb57c2f1240("riscv: add riscv rethook implementation") to LoongArch. Mainly refer to commitb57c2f1240("riscv: add riscv rethook implementation"). Replaces the kretprobe code with rethook on LoongArch. With this patch, kretprobe on LoongArch uses the rethook instead of kretprobe specific trampoline code. Signed-off-by: Haoran Jiang <jianghaoran@kylinos.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
29 lines
780 B
C
29 lines
780 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Generic return hook for LoongArch.
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*/
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#include <linux/kprobes.h>
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#include <linux/rethook.h>
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#include "rethook.h"
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/* This is called from arch_rethook_trampoline() */
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unsigned long __used arch_rethook_trampoline_callback(struct pt_regs *regs)
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{
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return rethook_trampoline_handler(regs, 0);
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}
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NOKPROBE_SYMBOL(arch_rethook_trampoline_callback);
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void arch_rethook_prepare(struct rethook_node *rhn, struct pt_regs *regs, bool mcount)
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{
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rhn->frame = 0;
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rhn->ret_addr = regs->regs[1];
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/* replace return addr with trampoline */
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regs->regs[1] = (unsigned long)arch_rethook_trampoline;
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}
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NOKPROBE_SYMBOL(arch_rethook_prepare);
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/* ASM function that handles the rethook must not be probed itself */
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NOKPROBE_SYMBOL(arch_rethook_trampoline);
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