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x86/entry: Convert SIMD coprocessor error exception to IDTENTRY

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Convert #XF to IDTENTRY_ERRORCODE:
  - Implement the C entry point with DEFINE_IDTENTRY
  - Emit the ASM stub with DECLARE_IDTENTRY
  - Handle INVD_BUG in C
  - Remove the ASM idtentry in 64bit
  - Remove the open coded ASM entry code in 32bit
  - Fixup the XEN/PV code
  - Remove the old prototypes
  - Remove the RCU warning as the new entry macro ensures correctness

No functional change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20200505134906.021552202@linutronix.de
This commit is contained in:
Thomas Gleixner 2020-02-25 23:16:29 +01:00
parent 436608bb00
commit 48227e21f7
8 changed files with 21 additions and 33 deletions
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29
arch/x86/kernel/traps.c
View file

@ -810,7 +810,7 @@ NOKPROBE_SYMBOL(do_debug);
* the correct behaviour even in the presence of the asynchronous
* IRQ13 behaviour
*/
static void math_error(struct pt_regs *regs, int error_code, int trapnr)
static void math_error(struct pt_regs *regs, int trapnr)
{
struct task_struct *task = current;
struct fpu *fpu = &task->thread.fpu;
@ -821,15 +821,15 @@ static void math_error(struct pt_regs *regs, int error_code, int trapnr)
cond_local_irq_enable(regs);
if (!user_mode(regs)) {
if (fixup_exception(regs, trapnr, error_code, 0))
if (fixup_exception(regs, trapnr, 0, 0))
goto exit;
task->thread.error_code = error_code;
task->thread.error_code = 0;
task->thread.trap_nr = trapnr;
if (notify_die(DIE_TRAP, str, regs, error_code,
trapnr, SIGFPE) != NOTIFY_STOP)
die(str, regs, error_code);
if (notify_die(DIE_TRAP, str, regs, 0, trapnr,
SIGFPE) != NOTIFY_STOP)
die(str, regs, 0);
goto exit;
}
@ -839,7 +839,7 @@ static void math_error(struct pt_regs *regs, int error_code, int trapnr)
fpu__save(fpu);
task->thread.trap_nr = trapnr;
task->thread.error_code = error_code;
task->thread.error_code = 0;
si_code = fpu__exception_code(fpu, trapnr);
/* Retry when we get spurious exceptions: */
@ -854,14 +854,19 @@ exit:
DEFINE_IDTENTRY(exc_coprocessor_error)
{
math_error(regs, 0, X86_TRAP_MF);
math_error(regs, X86_TRAP_MF);
}
dotraplinkage void
do_simd_coprocessor_error(struct pt_regs *regs, long error_code)
DEFINE_IDTENTRY(exc_simd_coprocessor_error)
{
RCU_LOCKDEP_WARN(!rcu_is_watching(), "entry code didn't wake RCU");
math_error(regs, error_code, X86_TRAP_XF);
if (IS_ENABLED(CONFIG_X86_INVD_BUG)) {
/* AMD 486 bug: INVD in CPL 0 raises #XF instead of #GP */
if (!static_cpu_has(X86_FEATURE_XMM)) {
__exc_general_protection(regs, 0);
return;
}
}
math_error(regs, X86_TRAP_XF);
}
DEFINE_IDTENTRY(exc_spurious_interrupt_bug)