forked from Minki/linux
7655146883
As of today we enable unaligned access unconditionally on ARCv2.
Do this under a Kconfig option to allow disable it for test, benchmarking
etc. Also while at it
- Select HAVE_EFFICIENT_UNALIGNED_ACCESS
- Although gcc defaults to unaligned access (since GNU 2018.03), add the
right toggles for enabling or disabling as appropriate
- update bootlog to prints both HW feature status (exists, enabled/disabled)
and SW status (used / not used).
- wire up the relaxed memcpy for unaligned access
Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
[vgupta: squashed patches, handle gcc -mno-unaligned-access quick]
252 lines
6.6 KiB
C
252 lines
6.6 KiB
C
/*
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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*/
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#include <linux/ptrace.h>
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#include <linux/module.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/kdev_t.h>
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#include <linux/proc_fs.h>
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#include <linux/file.h>
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#include <linux/sched/mm.h>
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#include <linux/sched/debug.h>
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#include <asm/arcregs.h>
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#include <asm/irqflags.h>
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#define ARC_PATH_MAX 256
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/*
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* Common routine to print scratch regs (r0-r12) or callee regs (r13-r25)
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* -Prints 3 regs per line and a CR.
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* -To continue, callee regs right after scratch, special handling of CR
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*/
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static noinline void print_reg_file(long *reg_rev, int start_num)
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{
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unsigned int i;
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char buf[512];
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int n = 0, len = sizeof(buf);
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for (i = start_num; i < start_num + 13; i++) {
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n += scnprintf(buf + n, len - n, "r%02u: 0x%08lx\t",
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i, (unsigned long)*reg_rev);
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if (((i + 1) % 3) == 0)
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n += scnprintf(buf + n, len - n, "\n");
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/* because pt_regs has regs reversed: r12..r0, r25..r13 */
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if (is_isa_arcv2() && start_num == 0)
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reg_rev++;
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else
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reg_rev--;
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}
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if (start_num != 0)
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n += scnprintf(buf + n, len - n, "\n\n");
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/* To continue printing callee regs on same line as scratch regs */
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if (start_num == 0)
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pr_info("%s", buf);
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else
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pr_cont("%s\n", buf);
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}
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static void show_callee_regs(struct callee_regs *cregs)
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{
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print_reg_file(&(cregs->r13), 13);
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}
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static void print_task_path_n_nm(struct task_struct *tsk)
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{
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char *path_nm = NULL;
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struct mm_struct *mm;
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struct file *exe_file;
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char buf[ARC_PATH_MAX];
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mm = get_task_mm(tsk);
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if (!mm)
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goto done;
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exe_file = get_mm_exe_file(mm);
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mmput(mm);
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if (exe_file) {
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path_nm = file_path(exe_file, buf, ARC_PATH_MAX-1);
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fput(exe_file);
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}
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done:
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pr_info("Path: %s\n", !IS_ERR(path_nm) ? path_nm : "?");
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}
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static void show_faulting_vma(unsigned long address)
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{
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struct vm_area_struct *vma;
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struct mm_struct *active_mm = current->active_mm;
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/* can't use print_vma_addr() yet as it doesn't check for
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* non-inclusive vma
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*/
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down_read(&active_mm->mmap_sem);
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vma = find_vma(active_mm, address);
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/* check against the find_vma( ) behaviour which returns the next VMA
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* if the container VMA is not found
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*/
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if (vma && (vma->vm_start <= address)) {
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char buf[ARC_PATH_MAX];
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char *nm = "?";
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if (vma->vm_file) {
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nm = file_path(vma->vm_file, buf, ARC_PATH_MAX-1);
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if (IS_ERR(nm))
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nm = "?";
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}
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pr_info(" @off 0x%lx in [%s]\n"
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" VMA: 0x%08lx to 0x%08lx\n",
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vma->vm_start < TASK_UNMAPPED_BASE ?
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address : address - vma->vm_start,
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nm, vma->vm_start, vma->vm_end);
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} else
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pr_info(" @No matching VMA found\n");
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up_read(&active_mm->mmap_sem);
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}
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static void show_ecr_verbose(struct pt_regs *regs)
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{
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unsigned int vec, cause_code;
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unsigned long address;
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pr_info("\n[ECR ]: 0x%08lx => ", regs->event);
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/* For Data fault, this is data address not instruction addr */
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address = current->thread.fault_address;
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vec = regs->ecr_vec;
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cause_code = regs->ecr_cause;
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/* For DTLB Miss or ProtV, display the memory involved too */
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if (vec == ECR_V_DTLB_MISS) {
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pr_cont("Invalid %s @ 0x%08lx by insn @ 0x%08lx\n",
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(cause_code == 0x01) ? "Read" :
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((cause_code == 0x02) ? "Write" : "EX"),
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address, regs->ret);
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} else if (vec == ECR_V_ITLB_MISS) {
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pr_cont("Insn could not be fetched\n");
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} else if (vec == ECR_V_MACH_CHK) {
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pr_cont("Machine Check (%s)\n", (cause_code == 0x0) ?
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"Double Fault" : "Other Fatal Err");
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} else if (vec == ECR_V_PROTV) {
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if (cause_code == ECR_C_PROTV_INST_FETCH)
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pr_cont("Execute from Non-exec Page\n");
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else if (cause_code == ECR_C_PROTV_MISALIG_DATA &&
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IS_ENABLED(CONFIG_ISA_ARCOMPACT))
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pr_cont("Misaligned r/w from 0x%08lx\n", address);
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else
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pr_cont("%s access not allowed on page\n",
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(cause_code == 0x01) ? "Read" :
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((cause_code == 0x02) ? "Write" : "EX"));
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} else if (vec == ECR_V_INSN_ERR) {
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pr_cont("Illegal Insn\n");
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#ifdef CONFIG_ISA_ARCV2
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} else if (vec == ECR_V_MEM_ERR) {
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if (cause_code == 0x00)
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pr_cont("Bus Error from Insn Mem\n");
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else if (cause_code == 0x10)
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pr_cont("Bus Error from Data Mem\n");
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else
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pr_cont("Bus Error, check PRM\n");
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} else if (vec == ECR_V_MISALIGN) {
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pr_cont("Misaligned r/w from 0x%08lx\n", address);
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#endif
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} else if (vec == ECR_V_TRAP) {
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if (regs->ecr_param == 5)
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pr_cont("gcc generated __builtin_trap\n");
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} else {
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pr_cont("Check Programmer's Manual\n");
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}
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}
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/************************************************************************
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* API called by rest of kernel
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***********************************************************************/
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void show_regs(struct pt_regs *regs)
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{
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struct task_struct *tsk = current;
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struct callee_regs *cregs;
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/*
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* generic code calls us with preemption disabled, but some calls
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* here could sleep, so re-enable to avoid lockdep splat
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*/
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preempt_enable();
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print_task_path_n_nm(tsk);
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show_regs_print_info(KERN_INFO);
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show_ecr_verbose(regs);
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pr_info("[EFA ]: 0x%08lx\n[BLINK ]: %pS\n[ERET ]: %pS\n",
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current->thread.fault_address,
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(void *)regs->blink, (void *)regs->ret);
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if (user_mode(regs))
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show_faulting_vma(regs->ret); /* faulting code, not data */
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pr_info("[STAT32]: 0x%08lx", regs->status32);
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#define STS_BIT(r, bit) r->status32 & STATUS_##bit##_MASK ? #bit" " : ""
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#ifdef CONFIG_ISA_ARCOMPACT
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pr_cont(" : %2s%2s%2s%2s%2s%2s%2s\n",
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(regs->status32 & STATUS_U_MASK) ? "U " : "K ",
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STS_BIT(regs, DE), STS_BIT(regs, AE),
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STS_BIT(regs, A2), STS_BIT(regs, A1),
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STS_BIT(regs, E2), STS_BIT(regs, E1));
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#else
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pr_cont(" : %2s%2s%2s%2s\n",
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STS_BIT(regs, IE),
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(regs->status32 & STATUS_U_MASK) ? "U " : "K ",
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STS_BIT(regs, DE), STS_BIT(regs, AE));
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#endif
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pr_info("BTA: 0x%08lx\t SP: 0x%08lx\t FP: 0x%08lx\n",
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regs->bta, regs->sp, regs->fp);
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pr_info("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n",
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regs->lp_start, regs->lp_end, regs->lp_count);
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/* print regs->r0 thru regs->r12
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* Sequential printing was generating horrible code
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*/
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print_reg_file(&(regs->r0), 0);
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/* If Callee regs were saved, display them too */
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cregs = (struct callee_regs *)current->thread.callee_reg;
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if (cregs)
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show_callee_regs(cregs);
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preempt_disable();
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}
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void show_kernel_fault_diag(const char *str, struct pt_regs *regs,
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unsigned long address)
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{
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current->thread.fault_address = address;
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/* Show fault description */
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pr_info("\n%s\n", str);
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/* Caller and Callee regs */
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show_regs(regs);
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/* Show stack trace if this Fatality happened in kernel mode */
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if (!user_mode(regs))
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show_stacktrace(current, regs);
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}
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