linux/arch/x86/mm/extable.c
Andy Lutomirski 0d0efc07f3 x86/head: Move the early NMI fixup into C
C is nicer than asm.

Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: KVM list <kvm@vger.kernel.org>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: xen-devel <Xen-devel@lists.xen.org>
Link: http://lkml.kernel.org/r/dd068269f8d59fe44e9e43a50d0efd67da65c2b5.1459605520.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-04-13 11:37:44 +02:00

111 lines
2.5 KiB
C

#include <linux/module.h>
#include <asm/uaccess.h>
#include <asm/traps.h>
typedef bool (*ex_handler_t)(const struct exception_table_entry *,
struct pt_regs *, int);
static inline unsigned long
ex_fixup_addr(const struct exception_table_entry *x)
{
return (unsigned long)&x->fixup + x->fixup;
}
static inline ex_handler_t
ex_fixup_handler(const struct exception_table_entry *x)
{
return (ex_handler_t)((unsigned long)&x->handler + x->handler);
}
bool ex_handler_default(const struct exception_table_entry *fixup,
struct pt_regs *regs, int trapnr)
{
regs->ip = ex_fixup_addr(fixup);
return true;
}
EXPORT_SYMBOL(ex_handler_default);
bool ex_handler_fault(const struct exception_table_entry *fixup,
struct pt_regs *regs, int trapnr)
{
regs->ip = ex_fixup_addr(fixup);
regs->ax = trapnr;
return true;
}
EXPORT_SYMBOL_GPL(ex_handler_fault);
bool ex_handler_ext(const struct exception_table_entry *fixup,
struct pt_regs *regs, int trapnr)
{
/* Special hack for uaccess_err */
current_thread_info()->uaccess_err = 1;
regs->ip = ex_fixup_addr(fixup);
return true;
}
EXPORT_SYMBOL(ex_handler_ext);
bool ex_has_fault_handler(unsigned long ip)
{
const struct exception_table_entry *e;
ex_handler_t handler;
e = search_exception_tables(ip);
if (!e)
return false;
handler = ex_fixup_handler(e);
return handler == ex_handler_fault;
}
int fixup_exception(struct pt_regs *regs, int trapnr)
{
const struct exception_table_entry *e;
ex_handler_t handler;
#ifdef CONFIG_PNPBIOS
if (unlikely(SEGMENT_IS_PNP_CODE(regs->cs))) {
extern u32 pnp_bios_fault_eip, pnp_bios_fault_esp;
extern u32 pnp_bios_is_utter_crap;
pnp_bios_is_utter_crap = 1;
printk(KERN_CRIT "PNPBIOS fault.. attempting recovery.\n");
__asm__ volatile(
"movl %0, %%esp\n\t"
"jmp *%1\n\t"
: : "g" (pnp_bios_fault_esp), "g" (pnp_bios_fault_eip));
panic("do_trap: can't hit this");
}
#endif
e = search_exception_tables(regs->ip);
if (!e)
return 0;
handler = ex_fixup_handler(e);
return handler(e, regs, trapnr);
}
/* Restricted version used during very early boot */
int __init early_fixup_exception(struct pt_regs *regs, int trapnr)
{
const struct exception_table_entry *e;
unsigned long new_ip;
ex_handler_t handler;
/* Ignore early NMIs. */
if (trapnr == X86_TRAP_NMI)
return 1;
e = search_exception_tables(regs->ip);
if (!e)
return 0;
new_ip = ex_fixup_addr(e);
handler = ex_fixup_handler(e);
/* special handling not supported during early boot */
if (handler != ex_handler_default)
return 0;
regs->ip = new_ip;
return 1;
}