252 lines
6.6 KiB
C
252 lines
6.6 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/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 &&
|
|
IS_ENABLED(CONFIG_ISA_ARCOMPACT))
|
|
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");
|
|
} else if (vec == ECR_V_MISALIGN) {
|
|
pr_cont("Misaligned r/w from 0x%08lx\n", address);
|
|
#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);
|
|
}
|