Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 251 insertions, 0 deletions

diff --git a/arch/parisc/kernel/ftrace.c b/arch/parisc/kernel/ftrace.c
new file mode 100644
index 0000000000..d1defb9ede
--- /dev/null
+++ b/arch/parisc/kernel/ftrace.c
@@ -0,0 +1,251 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Code for tracing calls in Linux kernel.
+ * Copyright (C) 2009-2016 Helge Deller <deller@gmx.de>
+ *
+ * based on code for x86 which is:
+ * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com>
+ *
+ * future possible enhancements:
+ *	- add CONFIG_STACK_TRACER
+ */
+
+#include <linux/init.h>
+#include <linux/ftrace.h>
+#include <linux/uaccess.h>
+#include <linux/kprobes.h>
+#include <linux/ptrace.h>
+#include <linux/jump_label.h>
+
+#include <asm/assembly.h>
+#include <asm/sections.h>
+#include <asm/ftrace.h>
+#include <asm/patch.h>
+
+#define __hot __section(".text.hot")
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+static DEFINE_STATIC_KEY_FALSE(ftrace_graph_enable);
+
+/*
+ * Hook the return address and push it in the stack of return addrs
+ * in current thread info.
+ */
+static void __hot prepare_ftrace_return(unsigned long *parent,
+					unsigned long self_addr)
+{
+	unsigned long old;
+	extern int parisc_return_to_handler;
+
+	if (unlikely(ftrace_graph_is_dead()))
+		return;
+
+	if (unlikely(atomic_read(&current->tracing_graph_pause)))
+		return;
+
+	old = *parent;
+
+	if (!function_graph_enter(old, self_addr, 0, NULL))
+		/* activate parisc_return_to_handler() as return point */
+		*parent = (unsigned long) &parisc_return_to_handler;
+}
+#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
+
+static ftrace_func_t ftrace_func;
+
+asmlinkage void notrace __hot ftrace_function_trampoline(unsigned long parent,
+				unsigned long self_addr,
+				unsigned long org_sp_gr3,
+				struct ftrace_regs *fregs)
+{
+	extern struct ftrace_ops *function_trace_op;
+
+	ftrace_func(self_addr, parent, function_trace_op, fregs);
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+	if (static_branch_unlikely(&ftrace_graph_enable)) {
+		unsigned long *parent_rp;
+
+		/* calculate pointer to %rp in stack */
+		parent_rp = (unsigned long *) (org_sp_gr3 - RP_OFFSET);
+		/* sanity check: parent_rp should hold parent */
+		if (*parent_rp != parent)
+			return;
+
+		prepare_ftrace_return(parent_rp, self_addr);
+		return;
+	}
+#endif
+}
+
+#ifdef CONFIG_FUNCTION_GRAPH_TRACER
+int ftrace_enable_ftrace_graph_caller(void)
+{
+	static_key_enable(&ftrace_graph_enable.key);
+	return 0;
+}
+
+int ftrace_disable_ftrace_graph_caller(void)
+{
+	static_key_enable(&ftrace_graph_enable.key);
+	return 0;
+}
+#endif
+
+#ifdef CONFIG_DYNAMIC_FTRACE
+int ftrace_update_ftrace_func(ftrace_func_t func)
+{
+	ftrace_func = func;
+	return 0;
+}
+
+int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr,
+			unsigned long addr)
+{
+	return 0;
+}
+
+unsigned long ftrace_call_adjust(unsigned long addr)
+{
+	return addr+(FTRACE_PATCHABLE_FUNCTION_SIZE-1)*4;
+}
+
+int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
+{
+	u32 insn[FTRACE_PATCHABLE_FUNCTION_SIZE];
+	u32 *tramp;
+	int size, ret, i;
+	void *ip;
+
+#ifdef CONFIG_64BIT
+	unsigned long addr2 =
+		(unsigned long)dereference_function_descriptor((void *)addr);
+
+	u32 ftrace_trampoline[] = {
+		0x73c10208, /* std,ma r1,100(sp) */
+		0x0c2110c1, /* ldd -10(r1),r1 */
+		0xe820d002, /* bve,n (r1) */
+		addr2 >> 32,
+		addr2 & 0xffffffff,
+		0xe83f1fd7, /* b,l,n .-14,r1 */
+	};
+
+	u32 ftrace_trampoline_unaligned[] = {
+		addr2 >> 32,
+		addr2 & 0xffffffff,
+		0x37de0200, /* ldo 100(sp),sp */
+		0x73c13e01, /* std r1,-100(sp) */
+		0x34213ff9, /* ldo -4(r1),r1 */
+		0x50213fc1, /* ldd -20(r1),r1 */
+		0xe820d002, /* bve,n (r1) */
+		0xe83f1fcf, /* b,l,n .-20,r1 */
+	};
+
+	BUILD_BUG_ON(ARRAY_SIZE(ftrace_trampoline_unaligned) >
+				FTRACE_PATCHABLE_FUNCTION_SIZE);
+#else
+	u32 ftrace_trampoline[] = {
+		(u32)addr,
+		0x6fc10080, /* stw,ma r1,40(sp) */
+		0x48213fd1, /* ldw -18(r1),r1 */
+		0xe820c002, /* bv,n r0(r1) */
+		0xe83f1fdf, /* b,l,n .-c,r1 */
+	};
+#endif
+
+	BUILD_BUG_ON(ARRAY_SIZE(ftrace_trampoline) >
+				FTRACE_PATCHABLE_FUNCTION_SIZE);
+
+	size = sizeof(ftrace_trampoline);
+	tramp = ftrace_trampoline;
+
+#ifdef CONFIG_64BIT
+	if (rec->ip & 0x4) {
+		size = sizeof(ftrace_trampoline_unaligned);
+		tramp = ftrace_trampoline_unaligned;
+	}
+#endif
+
+	ip = (void *)(rec->ip + 4 - size);
+
+	ret = copy_from_kernel_nofault(insn, ip, size);
+	if (ret)
+		return ret;
+
+	for (i = 0; i < size / 4; i++) {
+		if (insn[i] != INSN_NOP)
+			return -EINVAL;
+	}
+
+	__patch_text_multiple(ip, tramp, size);
+	return 0;
+}
+
+int ftrace_make_nop(struct module *mod, struct dyn_ftrace *rec,
+		    unsigned long addr)
+{
+	u32 insn[FTRACE_PATCHABLE_FUNCTION_SIZE];
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(insn); i++)
+		insn[i] = INSN_NOP;
+
+	__patch_text((void *)rec->ip, INSN_NOP);
+	__patch_text_multiple((void *)rec->ip + 4 - sizeof(insn),
+			      insn, sizeof(insn)-4);
+	return 0;
+}
+#endif
+
+#ifdef CONFIG_KPROBES_ON_FTRACE
+void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
+			   struct ftrace_ops *ops, struct ftrace_regs *fregs)
+{
+	struct kprobe_ctlblk *kcb;
+	struct pt_regs *regs;
+	struct kprobe *p;
+	int bit;
+
+	bit = ftrace_test_recursion_trylock(ip, parent_ip);
+	if (bit < 0)
+		return;
+
+	regs = ftrace_get_regs(fregs);
+	p = get_kprobe((kprobe_opcode_t *)ip);
+	if (unlikely(!p) || kprobe_disabled(p))
+		goto out;
+
+	if (kprobe_running()) {
+		kprobes_inc_nmissed_count(p);
+		goto out;
+	}
+
+	__this_cpu_write(current_kprobe, p);
+
+	kcb = get_kprobe_ctlblk();
+	kcb->kprobe_status = KPROBE_HIT_ACTIVE;
+
+	regs->iaoq[0] = ip;
+	regs->iaoq[1] = ip + 4;
+
+	if (!p->pre_handler || !p->pre_handler(p, regs)) {
+		regs->iaoq[0] = ip + 4;
+		regs->iaoq[1] = ip + 8;
+
+		if (unlikely(p->post_handler)) {
+			kcb->kprobe_status = KPROBE_HIT_SSDONE;
+			p->post_handler(p, regs, 0);
+		}
+	}
+	__this_cpu_write(current_kprobe, NULL);
+out:
+	ftrace_test_recursion_unlock(bit);
+}
+NOKPROBE_SYMBOL(kprobe_ftrace_handler);
+
+int arch_prepare_kprobe_ftrace(struct kprobe *p)
+{
+	p->ainsn.insn = NULL;
+	return 0;
+}
+#endif