Adding upstream version 4.19.249.upstream/4.19.249upstream

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

1 files changed, 248 insertions, 0 deletions

diff --git a/arch/arc/kernel/troubleshoot.c b/arch/arc/kernel/troubleshoot.c
new file mode 100644
index 000000000..215f51544
--- /dev/null
+++ b/arch/arc/kernel/troubleshoot.c
@@ -0,0 +1,248 @@
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ */
+
+#include <linux/ptrace.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/fs.h>
+#include <linux/kdev_t.h>
+#include <linux/proc_fs.h>
+#include <linux/file.h>
+#include <linux/sched/mm.h>
+#include <linux/sched/debug.h>
+
+#include <asm/arcregs.h>
+#include <asm/irqflags.h>
+
+#define ARC_PATH_MAX	256
+
+/*
+ * Common routine to print scratch regs (r0-r12) or callee regs (r13-r25)
+ *   -Prints 3 regs per line and a CR.
+ *   -To continue, callee regs right after scratch, special handling of CR
+ */
+static noinline void print_reg_file(long *reg_rev, int start_num)
+{
+	unsigned int i;
+	char buf[512];
+	int n = 0, len = sizeof(buf);
+
+	for (i = start_num; i < start_num + 13; i++) {
+		n += scnprintf(buf + n, len - n, "r%02u: 0x%08lx\t",
+			       i, (unsigned long)*reg_rev);
+
+		if (((i + 1) % 3) == 0)
+			n += scnprintf(buf + n, len - n, "\n");
+
+		/* because pt_regs has regs reversed: r12..r0, r25..r13 */
+		if (is_isa_arcv2() && start_num == 0)
+			reg_rev++;
+		else
+			reg_rev--;
+	}
+
+	if (start_num != 0)
+		n += scnprintf(buf + n, len - n, "\n\n");
+
+	/* To continue printing callee regs on same line as scratch regs */
+	if (start_num == 0)
+		pr_info("%s", buf);
+	else
+		pr_cont("%s\n", buf);
+}
+
+static void show_callee_regs(struct callee_regs *cregs)
+{
+	print_reg_file(&(cregs->r13), 13);
+}
+
+static void print_task_path_n_nm(struct task_struct *tsk)
+{
+	char *path_nm = NULL;
+	struct mm_struct *mm;
+	struct file *exe_file;
+	char buf[ARC_PATH_MAX];
+
+	mm = get_task_mm(tsk);
+	if (!mm)
+		goto done;
+
+	exe_file = get_mm_exe_file(mm);
+	mmput(mm);
+
+	if (exe_file) {
+		path_nm = file_path(exe_file, buf, ARC_PATH_MAX-1);
+		fput(exe_file);
+	}
+
+done:
+	pr_info("Path: %s\n", !IS_ERR(path_nm) ? path_nm : "?");
+}
+
+static void show_faulting_vma(unsigned long address)
+{
+	struct vm_area_struct *vma;
+	struct mm_struct *active_mm = current->active_mm;
+
+	/* can't use print_vma_addr() yet as it doesn't check for
+	 * non-inclusive vma
+	 */
+	down_read(&active_mm->mmap_sem);
+	vma = find_vma(active_mm, address);
+
+	/* check against the find_vma( ) behaviour which returns the next VMA
+	 * if the container VMA is not found
+	 */
+	if (vma && (vma->vm_start <= address)) {
+		char buf[ARC_PATH_MAX];
+		char *nm = "?";
+
+		if (vma->vm_file) {
+			nm = file_path(vma->vm_file, buf, ARC_PATH_MAX-1);
+			if (IS_ERR(nm))
+				nm = "?";
+		}
+		pr_info("    @off 0x%lx in [%s]\n"
+			"    VMA: 0x%08lx to 0x%08lx\n",
+			vma->vm_start < TASK_UNMAPPED_BASE ?
+				address : address - vma->vm_start,
+			nm, vma->vm_start, vma->vm_end);
+	} else
+		pr_info("    @No matching VMA found\n");
+
+	up_read(&active_mm->mmap_sem);
+}
+
+static void show_ecr_verbose(struct pt_regs *regs)
+{
+	unsigned int vec, cause_code;
+	unsigned long address;
+
+	pr_info("\n[ECR   ]: 0x%08lx => ", regs->event);
+
+	/* For Data fault, this is data address not instruction addr */
+	address = current->thread.fault_address;
+
+	vec = regs->ecr_vec;
+	cause_code = regs->ecr_cause;
+
+	/* For DTLB Miss or ProtV, display the memory involved too */
+	if (vec == ECR_V_DTLB_MISS) {
+		pr_cont("Invalid %s @ 0x%08lx by insn @ 0x%08lx\n",
+		       (cause_code == 0x01) ? "Read" :
+		       ((cause_code == 0x02) ? "Write" : "EX"),
+		       address, regs->ret);
+	} else if (vec == ECR_V_ITLB_MISS) {
+		pr_cont("Insn could not be fetched\n");
+	} else if (vec == ECR_V_MACH_CHK) {
+		pr_cont("Machine Check (%s)\n", (cause_code == 0x0) ?
+					"Double Fault" : "Other Fatal Err");
+
+	} else if (vec == ECR_V_PROTV) {
+		if (cause_code == ECR_C_PROTV_INST_FETCH)
+			pr_cont("Execute from Non-exec Page\n");
+		else if (cause_code == ECR_C_PROTV_MISALIG_DATA)
+			pr_cont("Misaligned r/w from 0x%08lx\n", address);
+		else
+			pr_cont("%s access not allowed on page\n",
+				(cause_code == 0x01) ? "Read" :
+				((cause_code == 0x02) ? "Write" : "EX"));
+	} else if (vec == ECR_V_INSN_ERR) {
+		pr_cont("Illegal Insn\n");
+#ifdef CONFIG_ISA_ARCV2
+	} else if (vec == ECR_V_MEM_ERR) {
+		if (cause_code == 0x00)
+			pr_cont("Bus Error from Insn Mem\n");
+		else if (cause_code == 0x10)
+			pr_cont("Bus Error from Data Mem\n");
+		else
+			pr_cont("Bus Error, check PRM\n");
+#endif
+	} else if (vec == ECR_V_TRAP) {
+		if (regs->ecr_param == 5)
+			pr_cont("gcc generated __builtin_trap\n");
+	} else {
+		pr_cont("Check Programmer's Manual\n");
+	}
+}
+
+/************************************************************************
+ *  API called by rest of kernel
+ ***********************************************************************/
+
+void show_regs(struct pt_regs *regs)
+{
+	struct task_struct *tsk = current;
+	struct callee_regs *cregs;
+
+	/*
+	 * generic code calls us with preemption disabled, but some calls
+	 * here could sleep, so re-enable to avoid lockdep splat
+	 */
+	preempt_enable();
+
+	print_task_path_n_nm(tsk);
+	show_regs_print_info(KERN_INFO);
+
+	show_ecr_verbose(regs);
+
+	pr_info("[EFA   ]: 0x%08lx\n[BLINK ]: %pS\n[ERET  ]: %pS\n",
+		current->thread.fault_address,
+		(void *)regs->blink, (void *)regs->ret);
+
+	if (user_mode(regs))
+		show_faulting_vma(regs->ret); /* faulting code, not data */
+
+	pr_info("[STAT32]: 0x%08lx", regs->status32);
+
+#define STS_BIT(r, bit)	r->status32 & STATUS_##bit##_MASK ? #bit" " : ""
+
+#ifdef CONFIG_ISA_ARCOMPACT
+	pr_cont(" : %2s%2s%2s%2s%2s%2s%2s\n",
+			(regs->status32 & STATUS_U_MASK) ? "U " : "K ",
+			STS_BIT(regs, DE), STS_BIT(regs, AE),
+			STS_BIT(regs, A2), STS_BIT(regs, A1),
+			STS_BIT(regs, E2), STS_BIT(regs, E1));
+#else
+	pr_cont(" : %2s%2s%2s%2s\n",
+			STS_BIT(regs, IE),
+			(regs->status32 & STATUS_U_MASK) ? "U " : "K ",
+			STS_BIT(regs, DE), STS_BIT(regs, AE));
+#endif
+	pr_info("BTA: 0x%08lx\t SP: 0x%08lx\t FP: 0x%08lx\n",
+		regs->bta, regs->sp, regs->fp);
+	pr_info("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n",
+	       regs->lp_start, regs->lp_end, regs->lp_count);
+
+	/* print regs->r0 thru regs->r12
+	 * Sequential printing was generating horrible code
+	 */
+	print_reg_file(&(regs->r0), 0);
+
+	/* If Callee regs were saved, display them too */
+	cregs = (struct callee_regs *)current->thread.callee_reg;
+	if (cregs)
+		show_callee_regs(cregs);
+
+	preempt_disable();
+}
+
+void show_kernel_fault_diag(const char *str, struct pt_regs *regs,
+			    unsigned long address)
+{
+	current->thread.fault_address = address;
+
+	/* Show fault description */
+	pr_info("\n%s\n", str);
+
+	/* Caller and Callee regs */
+	show_regs(regs);
+
+	/* Show stack trace if this Fatality happened in kernel mode */
+	if (!user_mode(regs))
+		show_stacktrace(current, regs);
+}