mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-14 22:44:27 +08:00
b55541414b
Use vma_lookup() to find the VMA at a specific address. As vma_lookup() will return NULL if the address is not within any VMA, the start address no longer needs to be validated. Link: https://lkml.kernel.org/r/20210521174745.2219620-4-Liam.Howlett@Oracle.com Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com> Reviewed-by: Laurent Dufour <ldufour@linux.ibm.com> Acked-by: David Hildenbrand <david@redhat.com> Acked-by: Davidlohr Bueso <dbueso@suse.de> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
228 lines
6.1 KiB
C
228 lines
6.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
|
|
*/
|
|
|
|
#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
|
|
|
|
static noinline void print_regs_scratch(struct pt_regs *regs)
|
|
{
|
|
pr_cont("BTA: 0x%08lx\n SP: 0x%08lx FP: 0x%08lx BLK: %pS\n",
|
|
regs->bta, regs->sp, regs->fp, (void *)regs->blink);
|
|
pr_cont("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n",
|
|
regs->lp_start, regs->lp_end, regs->lp_count);
|
|
|
|
pr_info("r00: 0x%08lx\tr01: 0x%08lx\tr02: 0x%08lx\n" \
|
|
"r03: 0x%08lx\tr04: 0x%08lx\tr05: 0x%08lx\n" \
|
|
"r06: 0x%08lx\tr07: 0x%08lx\tr08: 0x%08lx\n" \
|
|
"r09: 0x%08lx\tr10: 0x%08lx\tr11: 0x%08lx\n" \
|
|
"r12: 0x%08lx\t",
|
|
regs->r0, regs->r1, regs->r2,
|
|
regs->r3, regs->r4, regs->r5,
|
|
regs->r6, regs->r7, regs->r8,
|
|
regs->r9, regs->r10, regs->r11,
|
|
regs->r12);
|
|
}
|
|
|
|
static void print_regs_callee(struct callee_regs *regs)
|
|
{
|
|
pr_cont("r13: 0x%08lx\tr14: 0x%08lx\n" \
|
|
"r15: 0x%08lx\tr16: 0x%08lx\tr17: 0x%08lx\n" \
|
|
"r18: 0x%08lx\tr19: 0x%08lx\tr20: 0x%08lx\n" \
|
|
"r21: 0x%08lx\tr22: 0x%08lx\tr23: 0x%08lx\n" \
|
|
"r24: 0x%08lx\tr25: 0x%08lx\n",
|
|
regs->r13, regs->r14,
|
|
regs->r15, regs->r16, regs->r17,
|
|
regs->r18, regs->r19, regs->r20,
|
|
regs->r21, regs->r22, regs->r23,
|
|
regs->r24, regs->r25);
|
|
}
|
|
|
|
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
|
|
*/
|
|
mmap_read_lock(active_mm);
|
|
vma = vma_lookup(active_mm, address);
|
|
|
|
/* Lookup the vma at the address and report if the container VMA is not
|
|
* found
|
|
*/
|
|
if (vma) {
|
|
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] 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");
|
|
|
|
mmap_read_unlock(active_mm);
|
|
}
|
|
|
|
static void show_ecr_verbose(struct pt_regs *regs)
|
|
{
|
|
unsigned int vec, cause_code;
|
|
unsigned long address;
|
|
|
|
/* 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 @ %pS\n",
|
|
(cause_code == 0x01) ? "Read" :
|
|
((cause_code == 0x02) ? "Write" : "EX"),
|
|
address, (void *)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 = (struct callee_regs *)tsk->thread.callee_reg;
|
|
|
|
/*
|
|
* 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);
|
|
|
|
if (user_mode(regs))
|
|
show_faulting_vma(regs->ret); /* faulting code, not data */
|
|
|
|
pr_info("ECR: 0x%08lx EFA: 0x%08lx ERET: 0x%08lx\nSTAT: 0x%08lx",
|
|
regs->event, current->thread.fault_address, regs->ret,
|
|
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]",
|
|
(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] ",
|
|
STS_BIT(regs, IE),
|
|
(regs->status32 & STATUS_U_MASK) ? "U " : "K ",
|
|
STS_BIT(regs, DE), STS_BIT(regs, AE));
|
|
#endif
|
|
|
|
print_regs_scratch(regs);
|
|
if (cregs)
|
|
print_regs_callee(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, KERN_DEFAULT);
|
|
}
|