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linux/arch/c6x/kernel/traps.c
Dmitry Safonov a1eea2efdc c6x: add show_stack_loglvl() 
Currently, the log-level of show_stack() depends on a platform
realization.  It creates situations where the headers are printed with
lower log level or higher than the stacktrace (depending on a platform or
user).

Furthermore, it forces the logic decision from user to an architecture
side.  In result, some users as sysrq/kdb/etc are doing tricks with
temporary rising console_loglevel while printing their messages.  And in
result it not only may print unwanted messages from other CPUs, but also
omit printing at all in the unlucky case where the printk() was deferred.

Introducing log-level parameter and KERN_UNSUPPRESSED [1] seems an easier
approach than introducing more printk buffers.  Also, it will consolidate
printings with headers.

Introduce show_stack_loglvl(), that eventually will substitute
show_stack().

[1]: https://lore.kernel.org/lkml/20190528002412.1625-1-dima@arista.com/T/#u

Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Aurelien Jacquiot <jacquiot.aurelien@gmail.com>
Cc: Mark Salter <msalter@redhat.com>
Link: http://lkml.kernel.org/r/20200418201944.482088-12-dima@arista.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-06-09 09:39:11 -07:00

414 lines
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Port on Texas Instruments TMS320C6x architecture
*
* Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
*/
#include <linux/module.h>
#include <linux/ptrace.h>
#include <linux/sched/debug.h>
#include <linux/bug.h>
#include <asm/soc.h>
#include <asm/special_insns.h>
#include <asm/traps.h>
int (*c6x_nmi_handler)(struct pt_regs *regs);
void __init trap_init(void)
{
ack_exception(EXCEPT_TYPE_NXF);
ack_exception(EXCEPT_TYPE_EXC);
ack_exception(EXCEPT_TYPE_IXF);
ack_exception(EXCEPT_TYPE_SXF);
enable_exception();
}
void show_regs(struct pt_regs *regs)
{
pr_err("\n");
show_regs_print_info(KERN_ERR);
pr_err("PC: %08lx SP: %08lx\n", regs->pc, regs->sp);
pr_err("Status: %08lx ORIG_A4: %08lx\n", regs->csr, regs->orig_a4);
pr_err("A0: %08lx B0: %08lx\n", regs->a0, regs->b0);
pr_err("A1: %08lx B1: %08lx\n", regs->a1, regs->b1);
pr_err("A2: %08lx B2: %08lx\n", regs->a2, regs->b2);
pr_err("A3: %08lx B3: %08lx\n", regs->a3, regs->b3);
pr_err("A4: %08lx B4: %08lx\n", regs->a4, regs->b4);
pr_err("A5: %08lx B5: %08lx\n", regs->a5, regs->b5);
pr_err("A6: %08lx B6: %08lx\n", regs->a6, regs->b6);
pr_err("A7: %08lx B7: %08lx\n", regs->a7, regs->b7);
pr_err("A8: %08lx B8: %08lx\n", regs->a8, regs->b8);
pr_err("A9: %08lx B9: %08lx\n", regs->a9, regs->b9);
pr_err("A10: %08lx B10: %08lx\n", regs->a10, regs->b10);
pr_err("A11: %08lx B11: %08lx\n", regs->a11, regs->b11);
pr_err("A12: %08lx B12: %08lx\n", regs->a12, regs->b12);
pr_err("A13: %08lx B13: %08lx\n", regs->a13, regs->b13);
pr_err("A14: %08lx B14: %08lx\n", regs->a14, regs->dp);
pr_err("A15: %08lx B15: %08lx\n", regs->a15, regs->sp);
pr_err("A16: %08lx B16: %08lx\n", regs->a16, regs->b16);
pr_err("A17: %08lx B17: %08lx\n", regs->a17, regs->b17);
pr_err("A18: %08lx B18: %08lx\n", regs->a18, regs->b18);
pr_err("A19: %08lx B19: %08lx\n", regs->a19, regs->b19);
pr_err("A20: %08lx B20: %08lx\n", regs->a20, regs->b20);
pr_err("A21: %08lx B21: %08lx\n", regs->a21, regs->b21);
pr_err("A22: %08lx B22: %08lx\n", regs->a22, regs->b22);
pr_err("A23: %08lx B23: %08lx\n", regs->a23, regs->b23);
pr_err("A24: %08lx B24: %08lx\n", regs->a24, regs->b24);
pr_err("A25: %08lx B25: %08lx\n", regs->a25, regs->b25);
pr_err("A26: %08lx B26: %08lx\n", regs->a26, regs->b26);
pr_err("A27: %08lx B27: %08lx\n", regs->a27, regs->b27);
pr_err("A28: %08lx B28: %08lx\n", regs->a28, regs->b28);
pr_err("A29: %08lx B29: %08lx\n", regs->a29, regs->b29);
pr_err("A30: %08lx B30: %08lx\n", regs->a30, regs->b30);
pr_err("A31: %08lx B31: %08lx\n", regs->a31, regs->b31);
}
void die(char *str, struct pt_regs *fp, int nr)
{
console_verbose();
pr_err("%s: %08x\n", str, nr);
show_regs(fp);
pr_err("Process %s (pid: %d, stackpage=%08lx)\n",
current->comm, current->pid, (PAGE_SIZE +
(unsigned long) current));
dump_stack();
while (1)
;
}
static void die_if_kernel(char *str, struct pt_regs *fp, int nr)
{
if (user_mode(fp))
return;
die(str, fp, nr);
}
/* Internal exceptions */
static struct exception_info iexcept_table[10] = {
{ "Oops - instruction fetch", SIGBUS, BUS_ADRERR },
{ "Oops - fetch packet", SIGBUS, BUS_ADRERR },
{ "Oops - execute packet", SIGILL, ILL_ILLOPC },
{ "Oops - undefined instruction", SIGILL, ILL_ILLOPC },
{ "Oops - resource conflict", SIGILL, ILL_ILLOPC },
{ "Oops - resource access", SIGILL, ILL_PRVREG },
{ "Oops - privilege", SIGILL, ILL_PRVOPC },
{ "Oops - loops buffer", SIGILL, ILL_ILLOPC },
{ "Oops - software exception", SIGILL, ILL_ILLTRP },
{ "Oops - unknown exception", SIGILL, ILL_ILLOPC }
};
/* External exceptions */
static struct exception_info eexcept_table[128] = {
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - external exception", SIGBUS, BUS_ADRERR },
{ "Oops - CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
{ "Oops - CPU memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
{ "Oops - DMA memory protection fault in L1P", SIGSEGV, SEGV_ACCERR },
{ "Oops - CPU memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
{ "Oops - DMA memory protection fault in L1D", SIGSEGV, SEGV_ACCERR },
{ "Oops - CPU memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
{ "Oops - DMA memory protection fault in L2", SIGSEGV, SEGV_ACCERR },
{ "Oops - EMC CPU memory protection fault", SIGSEGV, SEGV_ACCERR },
{ "Oops - EMC bus error", SIGBUS, BUS_ADRERR }
};
static void do_trap(struct exception_info *except_info, struct pt_regs *regs)
{
unsigned long addr = instruction_pointer(regs);
if (except_info->code != TRAP_BRKPT)
pr_err("TRAP: %s PC[0x%lx] signo[%d] code[%d]\n",
except_info->kernel_str, regs->pc,
except_info->signo, except_info->code);
die_if_kernel(except_info->kernel_str, regs, addr);
force_sig_fault(except_info->signo, except_info->code,
(void __user *)addr);
}
/*
* Process an internal exception (non maskable)
*/
static int process_iexcept(struct pt_regs *regs)
{
unsigned int iexcept_report = get_iexcept();
unsigned int iexcept_num;
ack_exception(EXCEPT_TYPE_IXF);
pr_err("IEXCEPT: PC[0x%lx]\n", regs->pc);
while (iexcept_report) {
iexcept_num = __ffs(iexcept_report);
iexcept_report &= ~(1 << iexcept_num);
set_iexcept(iexcept_report);
if (*(unsigned int *)regs->pc == BKPT_OPCODE) {
/* This is a breakpoint */
struct exception_info bkpt_exception = {
"Oops - undefined instruction",
SIGTRAP, TRAP_BRKPT
};
do_trap(&bkpt_exception, regs);
iexcept_report &= ~(0xFF);
set_iexcept(iexcept_report);
continue;
}
do_trap(&iexcept_table[iexcept_num], regs);
}
return 0;
}
/*
* Process an external exception (maskable)
*/
static void process_eexcept(struct pt_regs *regs)
{
int evt;
pr_err("EEXCEPT: PC[0x%lx]\n", regs->pc);
while ((evt = soc_get_exception()) >= 0)
do_trap(&eexcept_table[evt], regs);
ack_exception(EXCEPT_TYPE_EXC);
}
/*
* Main exception processing
*/
asmlinkage int process_exception(struct pt_regs *regs)
{
unsigned int type;
unsigned int type_num;
unsigned int ie_num = 9; /* default is unknown exception */
while ((type = get_except_type()) != 0) {
type_num = fls(type) - 1;
switch (type_num) {
case EXCEPT_TYPE_NXF:
ack_exception(EXCEPT_TYPE_NXF);
if (c6x_nmi_handler)
(c6x_nmi_handler)(regs);
else
pr_alert("NMI interrupt!\n");
break;
case EXCEPT_TYPE_IXF:
if (process_iexcept(regs))
return 1;
break;
case EXCEPT_TYPE_EXC:
process_eexcept(regs);
break;
case EXCEPT_TYPE_SXF:
ie_num = 8;
default:
ack_exception(type_num);
do_trap(&iexcept_table[ie_num], regs);
break;
}
}
return 0;
}
static int kstack_depth_to_print = 48;
static void show_trace(unsigned long *stack, unsigned long *endstack,
const char *loglvl)
{
unsigned long addr;
int i;
printk("%sCall trace:", loglvl);
i = 0;
while (stack + 1 <= endstack) {
addr = *stack++;
/*
* If the address is either in the text segment of the
* kernel, or in the region which contains vmalloc'ed
* memory, it *may* be the address of a calling
* routine; if so, print it so that someone tracing
* down the cause of the crash will be able to figure
* out the call path that was taken.
*/
if (__kernel_text_address(addr)) {
#ifndef CONFIG_KALLSYMS
if (i % 5 == 0)
printk("%s\n ", loglvl);
#endif
printk("%s [<%08lx>] %pS\n", loglvl, addr, (void *)addr);
i++;
}
}
printk("%s\n", loglvl);
}
void show_stack_loglvl(struct task_struct *task, unsigned long *stack,
const char *loglvl)
{
unsigned long *p, *endstack;
int i;
if (!stack) {
if (task && task != current)
/* We know this is a kernel stack,
so this is the start/end */
stack = (unsigned long *)thread_saved_ksp(task);
else
stack = (unsigned long *)&stack;
}
endstack = (unsigned long *)(((unsigned long)stack + THREAD_SIZE - 1)
& -THREAD_SIZE);
pr_debug("Stack from %08lx:", (unsigned long)stack);
for (i = 0, p = stack; i < kstack_depth_to_print; i++) {
if (p + 1 > endstack)
break;
if (i % 8 == 0)
pr_cont("\n ");
pr_cont(" %08lx", *p++);
}
pr_cont("\n");
show_trace(stack, endstack, loglvl);
}
void show_stack(struct task_struct *task, unsigned long *stack)
{
show_stack_loglvl(task, stack, KERN_DEBUG);
}
int is_valid_bugaddr(unsigned long addr)
{
return __kernel_text_address(addr);
}
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