1 files changed, 63 insertions, 106 deletions

diff --git a/arch/powerpc/kernel/optprobes.c b/arch/powerpc/kernel/optprobes.c
index 024f7aad1952..3b1c2236cbee 100644
--- a/arch/powerpc/kernel/optprobes.c
+++ b/arch/powerpc/kernel/optprobes.c
@@ -16,25 +16,18 @@
 #include <asm/code-patching.h>
 #include <asm/sstep.h>
 #include <asm/ppc-opcode.h>
+#include <asm/inst.h>
 
-#define TMPL_CALL_HDLR_IDX	\
-	(optprobe_template_call_handler - optprobe_template_entry)
-#define TMPL_EMULATE_IDX	\
-	(optprobe_template_call_emulate - optprobe_template_entry)
-#define TMPL_RET_IDX		\
-	(optprobe_template_ret - optprobe_template_entry)
-#define TMPL_OP_IDX		\
-	(optprobe_template_op_address - optprobe_template_entry)
-#define TMPL_INSN_IDX		\
-	(optprobe_template_insn - optprobe_template_entry)
-#define TMPL_END_IDX		\
-	(optprobe_template_end - optprobe_template_entry)
-
-DEFINE_INSN_CACHE_OPS(ppc_optinsn);
+#define TMPL_CALL_HDLR_IDX	(optprobe_template_call_handler - optprobe_template_entry)
+#define TMPL_EMULATE_IDX	(optprobe_template_call_emulate - optprobe_template_entry)
+#define TMPL_RET_IDX		(optprobe_template_ret - optprobe_template_entry)
+#define TMPL_OP_IDX		(optprobe_template_op_address - optprobe_template_entry)
+#define TMPL_INSN_IDX		(optprobe_template_insn - optprobe_template_entry)
+#define TMPL_END_IDX		(optprobe_template_end - optprobe_template_entry)
 
 static bool insn_page_in_use;
 
-static void *__ppc_alloc_insn_page(void)
+void *alloc_optinsn_page(void)
 {
 	if (insn_page_in_use)
 		return NULL;
@@ -42,20 +35,11 @@ static void *__ppc_alloc_insn_page(void)
 	return &optinsn_slot;
 }
 
-static void __ppc_free_insn_page(void *page __maybe_unused)
+void free_optinsn_page(void *page)
 {
 	insn_page_in_use = false;
 }
 
-struct kprobe_insn_cache kprobe_ppc_optinsn_slots = {
-	.mutex = __MUTEX_INITIALIZER(kprobe_ppc_optinsn_slots.mutex),
-	.pages = LIST_HEAD_INIT(kprobe_ppc_optinsn_slots.pages),
-	/* insn_size initialized later */
-	.alloc = __ppc_alloc_insn_page,
-	.free = __ppc_free_insn_page,
-	.nr_garbage = 0,
-};
-
 /*
  * Check if we can optimize this probe. Returns NIP post-emulation if this can
  * be optimized and 0 otherwise.
@@ -65,14 +49,15 @@ static unsigned long can_optimize(struct kprobe *p)
 	struct pt_regs regs;
 	struct instruction_op op;
 	unsigned long nip = 0;
+	unsigned long addr = (unsigned long)p->addr;
 
 	/*
 	 * kprobe placed for kretprobe during boot time
 	 * has a 'nop' instruction, which can be emulated.
 	 * So further checks can be skipped.
 	 */
-	if (p->addr == (kprobe_opcode_t *)&kretprobe_trampoline)
-		return (unsigned long)p->addr + sizeof(kprobe_opcode_t);
+	if (p->addr == (kprobe_opcode_t *)&__kretprobe_trampoline)
+		return addr + sizeof(kprobe_opcode_t);
 
 	/*
 	 * We only support optimizing kernel addresses, but not
@@ -80,11 +65,11 @@ static unsigned long can_optimize(struct kprobe *p)
 	 *
 	 * FIXME: Optimize kprobes placed in module addresses.
 	 */
-	if (!is_kernel_addr((unsigned long)p->addr))
+	if (!is_kernel_addr(addr))
 		return 0;
 
 	memset(&regs, 0, sizeof(struct pt_regs));
-	regs.nip = (unsigned long)p->addr;
+	regs.nip = addr;
 	regs.trap = 0x0;
 	regs.msr = MSR_KERNEL;
 
@@ -99,8 +84,8 @@ static unsigned long can_optimize(struct kprobe *p)
 	 * Ensure that the instruction is not a conditional branch,
 	 * and that can be emulated.
 	 */
-	if (!is_conditional_branch(*p->ainsn.insn) &&
-			analyse_instr(&op, &regs, *p->ainsn.insn) == 1) {
+	if (!is_conditional_branch(ppc_inst_read(p->ainsn.insn)) &&
+	    analyse_instr(&op, &regs, ppc_inst_read(p->ainsn.insn)) == 1) {
 		emulate_update_regs(&regs, &op);
 		nip = regs.nip;
 	}
@@ -121,7 +106,7 @@ static void optimized_callback(struct optimized_kprobe *op,
 		kprobes_inc_nmissed_count(&op->kp);
 	} else {
 		__this_cpu_write(current_kprobe, &op->kp);
-		regs->nip = (unsigned long)op->kp.addr;
+		regs_set_return_ip(regs, (unsigned long)op->kp.addr);
 		get_kprobe_ctlblk()->kprobe_status = KPROBE_HIT_ACTIVE;
 		opt_pre_handler(&op->kp, regs);
 		__this_cpu_write(current_kprobe, NULL);
@@ -134,75 +119,53 @@ NOKPROBE_SYMBOL(optimized_callback);
 void arch_remove_optimized_kprobe(struct optimized_kprobe *op)
 {
 	if (op->optinsn.insn) {
-		free_ppc_optinsn_slot(op->optinsn.insn, 1);
+		free_optinsn_slot(op->optinsn.insn, 1);
 		op->optinsn.insn = NULL;
 	}
 }
 
-/*
- * emulate_step() requires insn to be emulated as
- * second parameter. Load register 'r4' with the
- * instruction.
- */
-void patch_imm32_load_insns(unsigned int val, kprobe_opcode_t *addr)
+static void patch_imm32_load_insns(unsigned long val, int reg, kprobe_opcode_t *addr)
 {
-	/* addis r4,0,(insn)@h */
-	patch_instruction(addr, PPC_INST_ADDIS | ___PPC_RT(4) |
-			  ((val >> 16) & 0xffff));
-	addr++;
-
-	/* ori r4,r4,(insn)@l */
-	patch_instruction(addr, PPC_INST_ORI | ___PPC_RA(4) |
-			  ___PPC_RS(4) | (val & 0xffff));
+	patch_instruction(addr++, ppc_inst(PPC_RAW_LIS(reg, PPC_HI(val))));
+	patch_instruction(addr, ppc_inst(PPC_RAW_ORI(reg, reg, PPC_LO(val))));
 }
 
 /*
  * Generate instructions to load provided immediate 64-bit value
- * to register 'r3' and patch these instructions at 'addr'.
+ * to register 'reg' and patch these instructions at 'addr'.
  */
-void patch_imm64_load_insns(unsigned long val, kprobe_opcode_t *addr)
+static void patch_imm64_load_insns(unsigned long long val, int reg, kprobe_opcode_t *addr)
 {
-	/* lis r3,(op)@highest */
-	patch_instruction(addr, PPC_INST_ADDIS | ___PPC_RT(3) |
-			  ((val >> 48) & 0xffff));
-	addr++;
-
-	/* ori r3,r3,(op)@higher */
-	patch_instruction(addr, PPC_INST_ORI | ___PPC_RA(3) |
-			  ___PPC_RS(3) | ((val >> 32) & 0xffff));
-	addr++;
-
-	/* rldicr r3,r3,32,31 */
-	patch_instruction(addr, PPC_INST_RLDICR | ___PPC_RA(3) |
-			  ___PPC_RS(3) | __PPC_SH64(32) | __PPC_ME64(31));
-	addr++;
-
-	/* oris r3,r3,(op)@h */
-	patch_instruction(addr, PPC_INST_ORIS | ___PPC_RA(3) |
-			  ___PPC_RS(3) | ((val >> 16) & 0xffff));
-	addr++;
-
-	/* ori r3,r3,(op)@l */
-	patch_instruction(addr, PPC_INST_ORI | ___PPC_RA(3) |
-			  ___PPC_RS(3) | (val & 0xffff));
+	patch_instruction(addr++, ppc_inst(PPC_RAW_LIS(reg, PPC_HIGHEST(val))));
+	patch_instruction(addr++, ppc_inst(PPC_RAW_ORI(reg, reg, PPC_HIGHER(val))));
+	patch_instruction(addr++, ppc_inst(PPC_RAW_SLDI(reg, reg, 32)));
+	patch_instruction(addr++, ppc_inst(PPC_RAW_ORIS(reg, reg, PPC_HI(val))));
+	patch_instruction(addr, ppc_inst(PPC_RAW_ORI(reg, reg, PPC_LO(val))));
+}
+
+static void patch_imm_load_insns(unsigned long val, int reg, kprobe_opcode_t *addr)
+{
+	if (IS_ENABLED(CONFIG_PPC64))
+		patch_imm64_load_insns(val, reg, addr);
+	else
+		patch_imm32_load_insns(val, reg, addr);
 }
 
 int arch_prepare_optimized_kprobe(struct optimized_kprobe *op, struct kprobe *p)
 {
-	kprobe_opcode_t *buff, branch_op_callback, branch_emulate_step;
-	kprobe_opcode_t *op_callback_addr, *emulate_step_addr;
+	ppc_inst_t branch_op_callback, branch_emulate_step, temp;
+	unsigned long op_callback_addr, emulate_step_addr;
+	kprobe_opcode_t *buff;
 	long b_offset;
 	unsigned long nip, size;
 	int rc, i;
 
-	kprobe_ppc_optinsn_slots.insn_size = MAX_OPTINSN_SIZE;
-
 	nip = can_optimize(p);
 	if (!nip)
 		return -EILSEQ;
 
 	/* Allocate instruction slot for detour buffer */
-	buff = get_ppc_optinsn_slot();
+	buff = get_optinsn_slot();
 	if (!buff)
 		return -ENOMEM;
 
@@ -220,8 +183,7 @@ int arch_prepare_optimized_kprobe(struct optimized_kprobe *op, struct kprobe *p)
 		goto error;
 
 	/* Check if the return address is also within 32MB range */
-	b_offset = (unsigned long)(buff + TMPL_RET_IDX) -
-			(unsigned long)nip;
+	b_offset = (unsigned long)(buff + TMPL_RET_IDX) - nip;
 	if (!is_offset_in_branch_range(b_offset))
 		goto error;
 
@@ -230,7 +192,7 @@ int arch_prepare_optimized_kprobe(struct optimized_kprobe *op, struct kprobe *p)
 	size = (TMPL_END_IDX * sizeof(kprobe_opcode_t)) / sizeof(int);
 	pr_devel("Copying template to %p, size %lu\n", buff, size);
 	for (i = 0; i < size; i++) {
-		rc = patch_instruction(buff + i, *(optprobe_template_entry + i));
+		rc = patch_instruction(buff + i, ppc_inst(*(optprobe_template_entry + i)));
 		if (rc < 0)
 			goto error;
 	}
@@ -239,27 +201,25 @@ int arch_prepare_optimized_kprobe(struct optimized_kprobe *op, struct kprobe *p)
 	 * Fixup the template with instructions to:
 	 * 1. load the address of the actual probepoint
 	 */
-	patch_imm64_load_insns((unsigned long)op, buff + TMPL_OP_IDX);
+	patch_imm_load_insns((unsigned long)op, 3, buff + TMPL_OP_IDX);
 
 	/*
 	 * 2. branch to optimized_callback() and emulate_step()
 	 */
-	op_callback_addr = (kprobe_opcode_t *)ppc_kallsyms_lookup_name("optimized_callback");
-	emulate_step_addr = (kprobe_opcode_t *)ppc_kallsyms_lookup_name("emulate_step");
+	op_callback_addr = ppc_kallsyms_lookup_name("optimized_callback");
+	emulate_step_addr = ppc_kallsyms_lookup_name("emulate_step");
 	if (!op_callback_addr || !emulate_step_addr) {
 		WARN(1, "Unable to lookup optimized_callback()/emulate_step()\n");
 		goto error;
 	}
 
-	branch_op_callback = create_branch((unsigned int *)buff + TMPL_CALL_HDLR_IDX,
-				(unsigned long)op_callback_addr,
-				BRANCH_SET_LINK);
+	rc = create_branch(&branch_op_callback, buff + TMPL_CALL_HDLR_IDX,
+			   op_callback_addr, BRANCH_SET_LINK);
 
-	branch_emulate_step = create_branch((unsigned int *)buff + TMPL_EMULATE_IDX,
-				(unsigned long)emulate_step_addr,
-				BRANCH_SET_LINK);
+	rc |= create_branch(&branch_emulate_step, buff + TMPL_EMULATE_IDX,
+			    emulate_step_addr, BRANCH_SET_LINK);
 
-	if (!branch_op_callback || !branch_emulate_step)
+	if (rc)
 		goto error;
 
 	patch_instruction(buff + TMPL_CALL_HDLR_IDX, branch_op_callback);
@@ -268,22 +228,22 @@ int arch_prepare_optimized_kprobe(struct optimized_kprobe *op, struct kprobe *p)
 	/*
 	 * 3. load instruction to be emulated into relevant register, and
 	 */
-	patch_imm32_load_insns(*p->ainsn.insn, buff + TMPL_INSN_IDX);
+	temp = ppc_inst_read(p->ainsn.insn);
+	patch_imm_load_insns(ppc_inst_as_ulong(temp), 4, buff + TMPL_INSN_IDX);
 
 	/*
 	 * 4. branch back from trampoline
 	 */
-	patch_branch(buff + TMPL_RET_IDX, (unsigned long)nip, 0);
+	patch_branch(buff + TMPL_RET_IDX, nip, 0);
 
-	flush_icache_range((unsigned long)buff,
-			   (unsigned long)(&buff[TMPL_END_IDX]));
+	flush_icache_range((unsigned long)buff, (unsigned long)(&buff[TMPL_END_IDX]));
 
 	op->optinsn.insn = buff;
 
 	return 0;
 
 error:
-	free_ppc_optinsn_slot(buff, 0);
+	free_optinsn_slot(buff, 0);
 	return -ERANGE;
 
 }
@@ -305,6 +265,7 @@ int arch_check_optimized_kprobe(struct optimized_kprobe *op)
 
 void arch_optimize_kprobes(struct list_head *oplist)
 {
+	ppc_inst_t instr;
 	struct optimized_kprobe *op;
 	struct optimized_kprobe *tmp;
 
@@ -313,11 +274,9 @@ void arch_optimize_kprobes(struct list_head *oplist)
 		 * Backup instructions which will be replaced
 		 * by jump address
 		 */
-		memcpy(op->optinsn.copied_insn, op->kp.addr,
-					       RELATIVEJUMP_SIZE);
-		patch_instruction(op->kp.addr,
-			create_branch((unsigned int *)op->kp.addr,
-				      (unsigned long)op->optinsn.insn, 0));
+		memcpy(op->optinsn.copied_insn, op->kp.addr, RELATIVEJUMP_SIZE);
+		create_branch(&instr, op->kp.addr, (unsigned long)op->optinsn.insn, 0);
+		patch_instruction(op->kp.addr, instr);
 		list_del_init(&op->list);
 	}
 }
@@ -327,8 +286,7 @@ void arch_unoptimize_kprobe(struct optimized_kprobe *op)
 	arch_arm_kprobe(&op->kp);
 }
 
-void arch_unoptimize_kprobes(struct list_head *oplist,
-			     struct list_head *done_list)
+void arch_unoptimize_kprobes(struct list_head *oplist, struct list_head *done_list)
 {
 	struct optimized_kprobe *op;
 	struct optimized_kprobe *tmp;
@@ -339,9 +297,8 @@ void arch_unoptimize_kprobes(struct list_head *oplist,
 	}
 }
 
-int arch_within_optimized_kprobe(struct optimized_kprobe *op,
-				 unsigned long addr)
+int arch_within_optimized_kprobe(struct optimized_kprobe *op, kprobe_opcode_t *addr)
 {
-	return ((unsigned long)op->kp.addr <= addr &&
-		(unsigned long)op->kp.addr + RELATIVEJUMP_SIZE > addr);
+	return (op->kp.addr <= addr &&
+		op->kp.addr + (RELATIVEJUMP_SIZE / sizeof(kprobe_opcode_t)) > addr);
 }