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// 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 = 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] 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);
}
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