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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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33e53ae1ce
This patch enable kprobes, kretprobes, ftrace interface. It utilized software breakpoint and single step debug exceptions, instructions simulation on csky. We use USR_BKPT replace origin instruction, and the kprobe handler prepares an excutable memory slot for out-of-line execution with a copy of the original instruction being probed. Most of instructions could be executed by single-step, but some instructions need origin pc value to execute and we need software simulate these instructions. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
49 lines
1.1 KiB
C
49 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef __ASM_CSKY_KPROBES_H
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#define __ASM_CSKY_KPROBES_H
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#include <asm-generic/kprobes.h>
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#ifdef CONFIG_KPROBES
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#include <linux/types.h>
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#include <linux/ptrace.h>
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#include <linux/percpu.h>
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#define __ARCH_WANT_KPROBES_INSN_SLOT
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#define MAX_INSN_SIZE 1
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#define flush_insn_slot(p) do { } while (0)
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#define kretprobe_blacklist_size 0
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#include <asm/probes.h>
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struct prev_kprobe {
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struct kprobe *kp;
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unsigned int status;
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};
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/* Single step context for kprobe */
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struct kprobe_step_ctx {
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unsigned long ss_pending;
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unsigned long match_addr;
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};
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/* per-cpu kprobe control block */
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struct kprobe_ctlblk {
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unsigned int kprobe_status;
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unsigned long saved_sr;
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struct prev_kprobe prev_kprobe;
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struct kprobe_step_ctx ss_ctx;
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};
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void arch_remove_kprobe(struct kprobe *p);
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int kprobe_fault_handler(struct pt_regs *regs, unsigned int trapnr);
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int kprobe_breakpoint_handler(struct pt_regs *regs);
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int kprobe_single_step_handler(struct pt_regs *regs);
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void kretprobe_trampoline(void);
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void __kprobes *trampoline_probe_handler(struct pt_regs *regs);
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#endif /* CONFIG_KPROBES */
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#endif /* __ASM_CSKY_KPROBES_H */
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