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From:   Tiezhu Yang <yangtiezhu@loongson.cn>
To:     Huacai Chen <chenhuacai@kernel.org>,
        WANG Xuerui <kernel@xen0n.name>
Cc:     loongarch@lists.linux.dev, linux-kernel@vger.kernel.org,
        loongson-kernel@lists.loongnix.cn
Subject: [RFC PATCH 1/3] LoongArch: Move three functions from kprobes.c to inst.h
Date:   Fri,  7 Apr 2023 10:14:59 +0800
Message-Id: <1680833701-1727-2-git-send-email-yangtiezhu@loongson.cn>
In-Reply-To: <1680833701-1727-1-git-send-email-yangtiezhu@loongson.cn>
References: <1680833701-1727-1-git-send-email-yangtiezhu@loongson.cn>
Precedence: bulk

The following three functions will be used for uprobes, move them
from kprobes.c to inst.h:

  insns_not_supported()
  insns_need_simulation()
  arch_simulate_insn()

This is preparation for later patch, no functionality change.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
 arch/loongarch/include/asm/inst.h | 39 +++++++++++++++++++++++++++++++++
 arch/loongarch/kernel/kprobes.c   | 46 ++-------------------------------------
 2 files changed, 41 insertions(+), 44 deletions(-)

diff --git a/arch/loongarch/include/asm/inst.h b/arch/loongarch/include/asm/inst.h
index a04fe75..af494b5 100644
--- a/arch/loongarch/include/asm/inst.h
+++ b/arch/loongarch/include/asm/inst.h
@@ -409,6 +409,45 @@ static inline bool is_self_loop_ins(union loongarch_instruction *ip, struct pt_r
 void simu_pc(struct pt_regs *regs, union loongarch_instruction insn);
 void simu_branch(struct pt_regs *regs, union loongarch_instruction insn);
 
+static inline bool insns_not_supported(union loongarch_instruction insn)
+{
+	switch (insn.reg2i14_format.opcode) {
+	case llw_op:
+	case lld_op:
+	case scw_op:
+	case scd_op:
+		pr_notice("kprobe: ll and sc instructions are not supported\n");
+		return true;
+	}
+
+	switch (insn.reg1i21_format.opcode) {
+	case bceqz_op:
+		pr_notice("kprobe: bceqz and bcnez instructions are not supported\n");
+		return true;
+	}
+
+	return false;
+}
+
+static inline bool insns_need_simulation(union loongarch_instruction insn)
+{
+	if (is_pc_ins(&insn))
+		return true;
+
+	if (is_branch_ins(&insn))
+		return true;
+
+	return false;
+}
+
+static inline void arch_simulate_insn(union loongarch_instruction insn, struct pt_regs *regs)
+{
+	if (is_pc_ins(&insn))
+		simu_pc(regs, insn);
+	else if (is_branch_ins(&insn))
+		simu_branch(regs, insn);
+}
+
 int larch_insn_read(void *addr, u32 *insnp);
 int larch_insn_write(void *addr, u32 insn);
 int larch_insn_patch_text(void *addr, u32 insn);
diff --git a/arch/loongarch/kernel/kprobes.c b/arch/loongarch/kernel/kprobes.c
index 56c8c4b..08c78d2 100644
--- a/arch/loongarch/kernel/kprobes.c
+++ b/arch/loongarch/kernel/kprobes.c
@@ -21,48 +21,6 @@ static const union loongarch_instruction singlestep_insn = {
 DEFINE_PER_CPU(struct kprobe *, current_kprobe);
 DEFINE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
 
-static bool insns_not_supported(union loongarch_instruction insn)
-{
-	switch (insn.reg2i14_format.opcode) {
-	case llw_op:
-	case lld_op:
-	case scw_op:
-	case scd_op:
-		pr_notice("kprobe: ll and sc instructions are not supported\n");
-		return true;
-	}
-
-	switch (insn.reg1i21_format.opcode) {
-	case bceqz_op:
-		pr_notice("kprobe: bceqz and bcnez instructions are not supported\n");
-		return true;
-	}
-
-	return false;
-}
-NOKPROBE_SYMBOL(insns_not_supported);
-
-static bool insns_need_simulation(struct kprobe *p)
-{
-	if (is_pc_ins(&p->opcode))
-		return true;
-
-	if (is_branch_ins(&p->opcode))
-		return true;
-
-	return false;
-}
-NOKPROBE_SYMBOL(insns_need_simulation);
-
-static void arch_simulate_insn(struct kprobe *p, struct pt_regs *regs)
-{
-	if (is_pc_ins(&p->opcode))
-		simu_pc(regs, p->opcode);
-	else if (is_branch_ins(&p->opcode))
-		simu_branch(regs, p->opcode);
-}
-NOKPROBE_SYMBOL(arch_simulate_insn);
-
 static void arch_prepare_ss_slot(struct kprobe *p)
 {
 	p->ainsn.insn[0] = *p->addr;
@@ -89,7 +47,7 @@ int arch_prepare_kprobe(struct kprobe *p)
 	if (insns_not_supported(p->opcode))
 		return -EINVAL;
 
-	if (insns_need_simulation(p)) {
+	if (insns_need_simulation(p->opcode)) {
 		p->ainsn.insn = NULL;
 	} else {
 		p->ainsn.insn = get_insn_slot();
@@ -220,7 +178,7 @@ static void setup_singlestep(struct kprobe *p, struct pt_regs *regs,
 		regs->csr_era = (unsigned long)p->ainsn.insn;
 	} else {
 		/* simulate single steping */
-		arch_simulate_insn(p, regs);
+		arch_simulate_insn(p->opcode, regs);
 		/* now go for post processing */
 		post_kprobe_handler(p, kcb, regs);
 	}
-- 
2.1.0