72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
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/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 and
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* only version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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/*
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* DLKM to register a callback with a ftrace event
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/tracepoint.h>
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#include <linux/coresight.h>
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#include <trace/events/exception.h>
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static void abort_coresight_tracing(void *ignore, struct task_struct *task,\
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unsigned long addr, unsigned int fsr)
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{
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coresight_abort();
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pr_debug("control_trace: task_name: %s, addr: %lu, fsr:%u",\
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(char *)task->comm, addr, fsr);
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}
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static void abort_tracing_undef_instr(void *ignore, struct pt_regs *regs,\
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void *pc)
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{
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if (user_mode(regs)) {
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coresight_abort();
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pr_debug("control_trace: pc: %p", pc);
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}
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}
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static int __init control_trace_init(void)
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{
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int ret_user_fault, ret_undef_instr;
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ret_user_fault = register_trace_user_fault(abort_coresight_tracing,\
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NULL);
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ret_undef_instr = register_trace_undef_instr(abort_tracing_undef_instr,\
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NULL);
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if (ret_user_fault != 0 || ret_undef_instr != 0) {
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pr_info("control_trace: Module Not Registered\n");
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return (ret_user_fault < 0 ?\
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ret_user_fault : ret_undef_instr);
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}
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pr_info("control_trace: Module Registered\n");
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return 0;
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}
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module_init(control_trace_init);
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static void __exit control_trace_exit(void)
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{
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unregister_trace_user_fault(abort_coresight_tracing, NULL);
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unregister_trace_undef_instr(abort_tracing_undef_instr, NULL);
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pr_info("control_trace: Module Removed\n");
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}
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module_exit(control_trace_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Kernel Module to abort tracing");
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