forked from Minki/linux
bccea41ec0
Fixes: 9bf39ab2ad ("vfs: add file_path() helper")
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
350 lines
8.9 KiB
C
350 lines
8.9 KiB
C
/*
|
|
* 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/fs_struct.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/file.h>
|
|
#include <asm/arcregs.h>
|
|
#include <asm/irqflags.h>
|
|
|
|
/*
|
|
* 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 *buf)
|
|
{
|
|
char *path_nm = NULL;
|
|
struct mm_struct *mm;
|
|
struct file *exe_file;
|
|
|
|
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, 255);
|
|
fput(exe_file);
|
|
}
|
|
|
|
done:
|
|
pr_info("Path: %s\n", !IS_ERR(path_nm) ? path_nm : "?");
|
|
}
|
|
|
|
static void show_faulting_vma(unsigned long address, char *buf)
|
|
{
|
|
struct vm_area_struct *vma;
|
|
struct inode *inode;
|
|
unsigned long ino = 0;
|
|
dev_t dev = 0;
|
|
char *nm = buf;
|
|
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)) {
|
|
struct file *file = vma->vm_file;
|
|
if (file) {
|
|
nm = file_path(file, buf, PAGE_SIZE - 1);
|
|
inode = file_inode(vma->vm_file);
|
|
dev = inode->i_sb->s_dev;
|
|
ino = inode->i_ino;
|
|
}
|
|
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("%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 {
|
|
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;
|
|
char *buf;
|
|
|
|
buf = (char *)__get_free_page(GFP_TEMPORARY);
|
|
if (!buf)
|
|
return;
|
|
|
|
print_task_path_n_nm(tsk, buf);
|
|
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, buf); /* 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);
|
|
|
|
free_page((unsigned long)buf);
|
|
}
|
|
|
|
void show_kernel_fault_diag(const char *str, struct pt_regs *regs,
|
|
unsigned long address)
|
|
{
|
|
current->thread.fault_address = address;
|
|
|
|
/* 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);
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/mount.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/init.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/debugfs.h>
|
|
|
|
static struct dentry *test_dentry;
|
|
static struct dentry *test_dir;
|
|
static struct dentry *test_u32_dentry;
|
|
|
|
static u32 clr_on_read = 1;
|
|
|
|
#ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT
|
|
u32 numitlb, numdtlb, num_pte_not_present;
|
|
|
|
static int fill_display_data(char *kbuf)
|
|
{
|
|
size_t num = 0;
|
|
num += sprintf(kbuf + num, "I-TLB Miss %x\n", numitlb);
|
|
num += sprintf(kbuf + num, "D-TLB Miss %x\n", numdtlb);
|
|
num += sprintf(kbuf + num, "PTE not present %x\n", num_pte_not_present);
|
|
|
|
if (clr_on_read)
|
|
numitlb = numdtlb = num_pte_not_present = 0;
|
|
|
|
return num;
|
|
}
|
|
|
|
static int tlb_stats_open(struct inode *inode, struct file *file)
|
|
{
|
|
file->private_data = (void *)__get_free_page(GFP_KERNEL);
|
|
return 0;
|
|
}
|
|
|
|
/* called on user read(): display the couters */
|
|
static ssize_t tlb_stats_output(struct file *file, /* file descriptor */
|
|
char __user *user_buf, /* user buffer */
|
|
size_t len, /* length of buffer */
|
|
loff_t *offset) /* offset in the file */
|
|
{
|
|
size_t num;
|
|
char *kbuf = (char *)file->private_data;
|
|
|
|
/* All of the data can he shoved in one iteration */
|
|
if (*offset != 0)
|
|
return 0;
|
|
|
|
num = fill_display_data(kbuf);
|
|
|
|
/* simple_read_from_buffer() is helper for copy to user space
|
|
It copies up to @2 (num) bytes from kernel buffer @4 (kbuf) at offset
|
|
@3 (offset) into the user space address starting at @1 (user_buf).
|
|
@5 (len) is max size of user buffer
|
|
*/
|
|
return simple_read_from_buffer(user_buf, num, offset, kbuf, len);
|
|
}
|
|
|
|
/* called on user write : clears the counters */
|
|
static ssize_t tlb_stats_clear(struct file *file, const char __user *user_buf,
|
|
size_t length, loff_t *offset)
|
|
{
|
|
numitlb = numdtlb = num_pte_not_present = 0;
|
|
return length;
|
|
}
|
|
|
|
static int tlb_stats_close(struct inode *inode, struct file *file)
|
|
{
|
|
free_page((unsigned long)(file->private_data));
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations tlb_stats_file_ops = {
|
|
.read = tlb_stats_output,
|
|
.write = tlb_stats_clear,
|
|
.open = tlb_stats_open,
|
|
.release = tlb_stats_close
|
|
};
|
|
#endif
|
|
|
|
static int __init arc_debugfs_init(void)
|
|
{
|
|
test_dir = debugfs_create_dir("arc", NULL);
|
|
|
|
#ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT
|
|
test_dentry = debugfs_create_file("tlb_stats", 0444, test_dir, NULL,
|
|
&tlb_stats_file_ops);
|
|
#endif
|
|
|
|
test_u32_dentry =
|
|
debugfs_create_u32("clr_on_read", 0444, test_dir, &clr_on_read);
|
|
|
|
return 0;
|
|
}
|
|
|
|
module_init(arc_debugfs_init);
|
|
|
|
static void __exit arc_debugfs_exit(void)
|
|
{
|
|
debugfs_remove(test_u32_dentry);
|
|
debugfs_remove(test_dentry);
|
|
debugfs_remove(test_dir);
|
|
}
|
|
module_exit(arc_debugfs_exit);
|
|
|
|
#endif
|