mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-13 22:14:20 +08:00
b847bd64ea
Unfortunately, Clang did not have support for "sp" as a global register
definition, and was crashing after the addition of current_stack_pointer.
This has been fixed in Clang 14, but earlier Clang versions need to
avoid this code, so add a versioned test and revert back to the
open-coded asm instances. Fixes Clang build error:
fatal error: error in backend: Invalid register name global variable
Fixes: 200ed341b8 ("mips: Implement "current_stack_pointer"")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/lkml/YikTQRql+il3HbrK@dev-arch.thelio-3990X
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Yanteng Si <siyanteng01@gmail.com>
Cc: linux-mips@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
120 lines
2.6 KiB
C
120 lines
2.6 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Code to handle x86 style IRQs plus some generic interrupt stuff.
|
|
*
|
|
* Copyright (C) 1992 Linus Torvalds
|
|
* Copyright (C) 1994 - 2000 Ralf Baechle
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel_stat.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/random.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/kallsyms.h>
|
|
#include <linux/kgdb.h>
|
|
#include <linux/ftrace.h>
|
|
#include <linux/irqdomain.h>
|
|
|
|
#include <linux/atomic.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
void *irq_stack[NR_CPUS];
|
|
|
|
/*
|
|
* 'what should we do if we get a hw irq event on an illegal vector'.
|
|
* each architecture has to answer this themselves.
|
|
*/
|
|
void ack_bad_irq(unsigned int irq)
|
|
{
|
|
printk("unexpected IRQ # %d\n", irq);
|
|
}
|
|
|
|
atomic_t irq_err_count;
|
|
|
|
int arch_show_interrupts(struct seq_file *p, int prec)
|
|
{
|
|
seq_printf(p, "%*s: %10u\n", prec, "ERR", atomic_read(&irq_err_count));
|
|
return 0;
|
|
}
|
|
|
|
asmlinkage void spurious_interrupt(void)
|
|
{
|
|
atomic_inc(&irq_err_count);
|
|
}
|
|
|
|
void __init init_IRQ(void)
|
|
{
|
|
int i;
|
|
unsigned int order = get_order(IRQ_STACK_SIZE);
|
|
|
|
for (i = 0; i < NR_IRQS; i++)
|
|
irq_set_noprobe(i);
|
|
|
|
if (cpu_has_veic)
|
|
clear_c0_status(ST0_IM);
|
|
|
|
arch_init_irq();
|
|
|
|
for_each_possible_cpu(i) {
|
|
void *s = (void *)__get_free_pages(GFP_KERNEL, order);
|
|
|
|
irq_stack[i] = s;
|
|
pr_debug("CPU%d IRQ stack at 0x%p - 0x%p\n", i,
|
|
irq_stack[i], irq_stack[i] + IRQ_STACK_SIZE);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_STACKOVERFLOW
|
|
static inline void check_stack_overflow(void)
|
|
{
|
|
unsigned long sp;
|
|
|
|
__asm__ __volatile__("move %0, $sp" : "=r" (sp));
|
|
sp &= THREAD_MASK;
|
|
|
|
/*
|
|
* Check for stack overflow: is there less than STACK_WARN free?
|
|
* STACK_WARN is defined as 1/8 of THREAD_SIZE by default.
|
|
*/
|
|
if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) {
|
|
printk("do_IRQ: stack overflow: %ld\n",
|
|
sp - sizeof(struct thread_info));
|
|
dump_stack();
|
|
}
|
|
}
|
|
#else
|
|
static inline void check_stack_overflow(void) {}
|
|
#endif
|
|
|
|
|
|
/*
|
|
* do_IRQ handles all normal device IRQ's (the special
|
|
* SMP cross-CPU interrupts have their own specific
|
|
* handlers).
|
|
*/
|
|
void __irq_entry do_IRQ(unsigned int irq)
|
|
{
|
|
irq_enter();
|
|
check_stack_overflow();
|
|
generic_handle_irq(irq);
|
|
irq_exit();
|
|
}
|
|
|
|
#ifdef CONFIG_IRQ_DOMAIN
|
|
void __irq_entry do_domain_IRQ(struct irq_domain *domain, unsigned int hwirq)
|
|
{
|
|
irq_enter();
|
|
check_stack_overflow();
|
|
generic_handle_domain_irq(domain, hwirq);
|
|
irq_exit();
|
|
}
|
|
#endif
|