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linux/arch/c6x/kernel/traps.c
Eric W. Biederman 559f9008bb signal/c6x: Use force_sig_fault where appropriate 
Filling in struct siginfo before calling force_sig_info a tedious and
error prone process, where once in a great while the wrong fields
are filled out, and siginfo has been inconsistently cleared.

Simplify this process by using the helper force_sig_fault.  Which
takes as a parameters all of the information it needs, ensures
all of the fiddly bits of filling in struct siginfo are done properly
and then calls force_sig_info.

In short about a 5 line reduction in code for every time force_sig_info
is called, which makes the calling function clearer.

Cc: Mark Salter <msalter@redhat.com>
Cc: Aurelien Jacquiot <jacquiot.aurelien@gmail.com>
Cc: linux-c6x-dev@linux-c6x.org
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2018-04-25 10:40:59 -05:00

410 lines
14 KiB
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/*
* Port on Texas Instruments TMS320C6x architecture
*
* Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
* Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.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
* published by the Free Software Foundation.
*/
#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, current);
}
/*
* 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)
{
unsigned long addr;
int i;
pr_debug("Call trace:");
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)
pr_debug("\n ");
#endif
pr_debug(" [<%08lx>] %pS\n", addr, (void *)addr);
i++;
}
}
pr_debug("\n");
}
void show_stack(struct task_struct *task, unsigned long *stack)
{
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);
}
int is_valid_bugaddr(unsigned long addr)
{
return __kernel_text_address(addr);
}
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