linux/arch/powerpc/kernel/interrupt.c

497 lines
13 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
#include <linux/context_tracking.h>
#include <linux/err.h>
#include <linux/compat.h>
#include <asm/asm-prototypes.h>
#include <asm/kup.h>
#include <asm/cputime.h>
#include <asm/interrupt.h>
#include <asm/hw_irq.h>
#include <asm/interrupt.h>
#include <asm/kprobes.h>
#include <asm/paca.h>
#include <asm/ptrace.h>
#include <asm/reg.h>
#include <asm/signal.h>
#include <asm/switch_to.h>
#include <asm/syscall.h>
#include <asm/time.h>
#include <asm/unistd.h>
#if defined(CONFIG_PPC_ADV_DEBUG_REGS) && defined(CONFIG_PPC32)
unsigned long global_dbcr0[NR_CPUS];
#endif
typedef long (*syscall_fn)(long, long, long, long, long, long);
/* Has to run notrace because it is entered not completely "reconciled" */
notrace long system_call_exception(long r3, long r4, long r5,
long r6, long r7, long r8,
unsigned long r0, struct pt_regs *regs)
{
syscall_fn f;
kuep_lock();
regs->orig_gpr3 = r3;
if (IS_ENABLED(CONFIG_PPC_IRQ_SOFT_MASK_DEBUG))
BUG_ON(irq_soft_mask_return() != IRQS_ALL_DISABLED);
trace_hardirqs_off(); /* finish reconciling */
CT_WARN_ON(ct_state() == CONTEXT_KERNEL);
user_exit_irqoff();
if (!IS_ENABLED(CONFIG_BOOKE) && !IS_ENABLED(CONFIG_40x))
BUG_ON(!(regs->msr & MSR_RI));
BUG_ON(!(regs->msr & MSR_PR));
BUG_ON(arch_irq_disabled_regs(regs));
#ifdef CONFIG_PPC_PKEY
if (mmu_has_feature(MMU_FTR_PKEY)) {
unsigned long amr, iamr;
bool flush_needed = false;
/*
* When entering from userspace we mostly have the AMR/IAMR
* different from kernel default values. Hence don't compare.
*/
amr = mfspr(SPRN_AMR);
iamr = mfspr(SPRN_IAMR);
regs->amr = amr;
regs->iamr = iamr;
if (mmu_has_feature(MMU_FTR_BOOK3S_KUAP)) {
mtspr(SPRN_AMR, AMR_KUAP_BLOCKED);
flush_needed = true;
}
if (mmu_has_feature(MMU_FTR_BOOK3S_KUEP)) {
mtspr(SPRN_IAMR, AMR_KUEP_BLOCKED);
flush_needed = true;
}
if (flush_needed)
isync();
} else
#endif
kuap_assert_locked();
booke_restore_dbcr0();
account_cpu_user_entry();
account_stolen_time();
/*
* This is not required for the syscall exit path, but makes the
* stack frame look nicer. If this was initialised in the first stack
* frame, or if the unwinder was taught the first stack frame always
* returns to user with IRQS_ENABLED, this store could be avoided!
*/
irq_soft_mask_regs_set_state(regs, IRQS_ENABLED);
local_irq_enable();
if (unlikely(current_thread_info()->flags & _TIF_SYSCALL_DOTRACE)) {
if (unlikely(trap_is_unsupported_scv(regs))) {
/* Unsupported scv vector */
_exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
return regs->gpr[3];
}
/*
* We use the return value of do_syscall_trace_enter() as the
* syscall number. If the syscall was rejected for any reason
* do_syscall_trace_enter() returns an invalid syscall number
* and the test against NR_syscalls will fail and the return
* value to be used is in regs->gpr[3].
*/
r0 = do_syscall_trace_enter(regs);
if (unlikely(r0 >= NR_syscalls))
return regs->gpr[3];
r3 = regs->gpr[3];
r4 = regs->gpr[4];
r5 = regs->gpr[5];
r6 = regs->gpr[6];
r7 = regs->gpr[7];
r8 = regs->gpr[8];
} else if (unlikely(r0 >= NR_syscalls)) {
if (unlikely(trap_is_unsupported_scv(regs))) {
/* Unsupported scv vector */
_exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
return regs->gpr[3];
}
return -ENOSYS;
}
/* May be faster to do array_index_nospec? */
barrier_nospec();
if (unlikely(is_compat_task())) {
f = (void *)compat_sys_call_table[r0];
r3 &= 0x00000000ffffffffULL;
r4 &= 0x00000000ffffffffULL;
r5 &= 0x00000000ffffffffULL;
r6 &= 0x00000000ffffffffULL;
r7 &= 0x00000000ffffffffULL;
r8 &= 0x00000000ffffffffULL;
} else {
f = (void *)sys_call_table[r0];
}
return f(r3, r4, r5, r6, r7, r8);
}
/*
* local irqs must be disabled. Returns false if the caller must re-enable
* them, check for new work, and try again.
*
* This should be called with local irqs disabled, but if they were previously
* enabled when the interrupt handler returns (indicating a process-context /
* synchronous interrupt) then irqs_enabled should be true.
*/
static notrace __always_inline bool __prep_irq_for_enabled_exit(bool clear_ri)
{
/* This must be done with RI=1 because tracing may touch vmaps */
trace_hardirqs_on();
/* This pattern matches prep_irq_for_idle */
if (clear_ri)
__hard_EE_RI_disable();
else
__hard_irq_disable();
#ifdef CONFIG_PPC64
if (unlikely(lazy_irq_pending_nocheck())) {
/* Took an interrupt, may have more exit work to do. */
if (clear_ri)
__hard_RI_enable();
trace_hardirqs_off();
local_paca->irq_happened |= PACA_IRQ_HARD_DIS;
return false;
}
local_paca->irq_happened = 0;
irq_soft_mask_set(IRQS_ENABLED);
#endif
return true;
}
static notrace inline bool prep_irq_for_enabled_exit(bool clear_ri, bool irqs_enabled)
{
if (__prep_irq_for_enabled_exit(clear_ri))
return true;
/*
* Must replay pending soft-masked interrupts now. Don't just
* local_irq_enabe(); local_irq_disable(); because if we are
* returning from an asynchronous interrupt here, another one
* might hit after irqs are enabled, and it would exit via this
* same path allowing another to fire, and so on unbounded.
*
* If interrupts were enabled when this interrupt exited,
* indicating a process context (synchronous) interrupt,
* local_irq_enable/disable can be used, which will enable
* interrupts rather than keeping them masked (unclear how
* much benefit this is over just replaying for all cases,
* because we immediately disable again, so all we're really
* doing is allowing hard interrupts to execute directly for
* a very small time, rather than being masked and replayed).
*/
if (irqs_enabled) {
local_irq_enable();
local_irq_disable();
} else {
replay_soft_interrupts();
}
return false;
}
static notrace void booke_load_dbcr0(void)
{
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
unsigned long dbcr0 = current->thread.debug.dbcr0;
if (likely(!(dbcr0 & DBCR0_IDM)))
return;
/*
* Check to see if the dbcr0 register is set up to debug.
* Use the internal debug mode bit to do this.
*/
mtmsr(mfmsr() & ~MSR_DE);
if (IS_ENABLED(CONFIG_PPC32)) {
isync();
global_dbcr0[smp_processor_id()] = mfspr(SPRN_DBCR0);
}
mtspr(SPRN_DBCR0, dbcr0);
mtspr(SPRN_DBSR, -1);
#endif
}
/*
* This should be called after a syscall returns, with r3 the return value
* from the syscall. If this function returns non-zero, the system call
* exit assembly should additionally load all GPR registers and CTR and XER
* from the interrupt frame.
*
* The function graph tracer can not trace the return side of this function,
* because RI=0 and soft mask state is "unreconciled", so it is marked notrace.
*/
notrace unsigned long syscall_exit_prepare(unsigned long r3,
struct pt_regs *regs,
long scv)
{
unsigned long ti_flags;
unsigned long ret = 0;
bool is_not_scv = !IS_ENABLED(CONFIG_PPC_BOOK3S_64) || !scv;
CT_WARN_ON(ct_state() == CONTEXT_USER);
kuap_assert_locked();
regs->result = r3;
/* Check whether the syscall is issued inside a restartable sequence */
rseq_syscall(regs);
ti_flags = current_thread_info()->flags;
if (unlikely(r3 >= (unsigned long)-MAX_ERRNO) && is_not_scv) {
if (likely(!(ti_flags & (_TIF_NOERROR | _TIF_RESTOREALL)))) {
r3 = -r3;
regs->ccr |= 0x10000000; /* Set SO bit in CR */
}
}
if (unlikely(ti_flags & _TIF_PERSYSCALL_MASK)) {
if (ti_flags & _TIF_RESTOREALL)
ret = _TIF_RESTOREALL;
else
regs->gpr[3] = r3;
clear_bits(_TIF_PERSYSCALL_MASK, &current_thread_info()->flags);
} else {
regs->gpr[3] = r3;
}
if (unlikely(ti_flags & _TIF_SYSCALL_DOTRACE)) {
do_syscall_trace_leave(regs);
ret |= _TIF_RESTOREALL;
}
local_irq_disable();
again:
ti_flags = READ_ONCE(current_thread_info()->flags);
while (unlikely(ti_flags & (_TIF_USER_WORK_MASK & ~_TIF_RESTORE_TM))) {
local_irq_enable();
if (ti_flags & _TIF_NEED_RESCHED) {
schedule();
} else {
/*
* SIGPENDING must restore signal handler function
* argument GPRs, and some non-volatiles (e.g., r1).
* Restore all for now. This could be made lighter.
*/
if (ti_flags & _TIF_SIGPENDING)
ret |= _TIF_RESTOREALL;
do_notify_resume(regs, ti_flags);
}
local_irq_disable();
ti_flags = READ_ONCE(current_thread_info()->flags);
}
if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && IS_ENABLED(CONFIG_PPC_FPU)) {
if (IS_ENABLED(CONFIG_PPC_TRANSACTIONAL_MEM) &&
unlikely((ti_flags & _TIF_RESTORE_TM))) {
restore_tm_state(regs);
} else {
unsigned long mathflags = MSR_FP;
if (cpu_has_feature(CPU_FTR_VSX))
mathflags |= MSR_VEC | MSR_VSX;
else if (cpu_has_feature(CPU_FTR_ALTIVEC))
mathflags |= MSR_VEC;
/*
* If userspace MSR has all available FP bits set,
* then they are live and no need to restore. If not,
* it means the regs were given up and restore_math
* may decide to restore them (to avoid taking an FP
* fault).
*/
if ((regs->msr & mathflags) != mathflags)
restore_math(regs);
}
}
user_enter_irqoff();
/* scv need not set RI=0 because SRRs are not used */
if (unlikely(!__prep_irq_for_enabled_exit(is_not_scv))) {
user_exit_irqoff();
local_irq_enable();
local_irq_disable();
goto again;
}
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
local_paca->tm_scratch = regs->msr;
#endif
booke_load_dbcr0();
account_cpu_user_exit();
/* Restore user access locks last */
kuap_user_restore(regs);
kuep_unlock();
return ret;
}
notrace unsigned long interrupt_exit_user_prepare(struct pt_regs *regs)
{
unsigned long ti_flags;
unsigned long flags;
unsigned long ret = 0;
if (!IS_ENABLED(CONFIG_BOOKE) && !IS_ENABLED(CONFIG_40x))
BUG_ON(!(regs->msr & MSR_RI));
BUG_ON(!(regs->msr & MSR_PR));
BUG_ON(arch_irq_disabled_regs(regs));
CT_WARN_ON(ct_state() == CONTEXT_USER);
/*
* We don't need to restore AMR on the way back to userspace for KUAP.
* AMR can only have been unlocked if we interrupted the kernel.
*/
kuap_assert_locked();
local_irq_save(flags);
again:
ti_flags = READ_ONCE(current_thread_info()->flags);
while (unlikely(ti_flags & (_TIF_USER_WORK_MASK & ~_TIF_RESTORE_TM))) {
local_irq_enable(); /* returning to user: may enable */
if (ti_flags & _TIF_NEED_RESCHED) {
schedule();
} else {
if (ti_flags & _TIF_SIGPENDING)
ret |= _TIF_RESTOREALL;
do_notify_resume(regs, ti_flags);
}
local_irq_disable();
ti_flags = READ_ONCE(current_thread_info()->flags);
}
if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && IS_ENABLED(CONFIG_PPC_FPU)) {
if (IS_ENABLED(CONFIG_PPC_TRANSACTIONAL_MEM) &&
unlikely((ti_flags & _TIF_RESTORE_TM))) {
restore_tm_state(regs);
} else {
unsigned long mathflags = MSR_FP;
if (cpu_has_feature(CPU_FTR_VSX))
mathflags |= MSR_VEC | MSR_VSX;
else if (cpu_has_feature(CPU_FTR_ALTIVEC))
mathflags |= MSR_VEC;
/* See above restore_math comment */
if ((regs->msr & mathflags) != mathflags)
restore_math(regs);
}
}
user_enter_irqoff();
if (unlikely(!__prep_irq_for_enabled_exit(true))) {
user_exit_irqoff();
local_irq_enable();
local_irq_disable();
goto again;
}
booke_load_dbcr0();
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
local_paca->tm_scratch = regs->msr;
#endif
account_cpu_user_exit();
/* Restore user access locks last */
kuap_user_restore(regs);
kuep_unlock();
return ret;
}
void preempt_schedule_irq(void);
notrace unsigned long interrupt_exit_kernel_prepare(struct pt_regs *regs)
{
unsigned long flags;
unsigned long ret = 0;
unsigned long kuap;
if (!IS_ENABLED(CONFIG_BOOKE) && !IS_ENABLED(CONFIG_40x) &&
unlikely(!(regs->msr & MSR_RI)))
unrecoverable_exception(regs);
BUG_ON(regs->msr & MSR_PR);
/*
* CT_WARN_ON comes here via program_check_exception,
* so avoid recursion.
*/
if (TRAP(regs) != INTERRUPT_PROGRAM)
CT_WARN_ON(ct_state() == CONTEXT_USER);
kuap = kuap_get_and_assert_locked();
if (unlikely(current_thread_info()->flags & _TIF_EMULATE_STACK_STORE)) {
clear_bits(_TIF_EMULATE_STACK_STORE, &current_thread_info()->flags);
ret = 1;
}
local_irq_save(flags);
if (!arch_irq_disabled_regs(regs)) {
/* Returning to a kernel context with local irqs enabled. */
WARN_ON_ONCE(!(regs->msr & MSR_EE));
again:
if (IS_ENABLED(CONFIG_PREEMPT)) {
/* Return to preemptible kernel context */
if (unlikely(current_thread_info()->flags & _TIF_NEED_RESCHED)) {
if (preempt_count() == 0)
preempt_schedule_irq();
}
}
if (unlikely(!prep_irq_for_enabled_exit(true, !irqs_disabled_flags(flags))))
goto again;
} else {
/* Returning to a kernel context with local irqs disabled. */
__hard_EE_RI_disable();
#ifdef CONFIG_PPC64
if (regs->msr & MSR_EE)
local_paca->irq_happened &= ~PACA_IRQ_HARD_DIS;
#endif
}
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
local_paca->tm_scratch = regs->msr;
#endif
/*
* 64s does not want to mfspr(SPRN_AMR) here, because this comes after
* mtmsr, which would cause Read-After-Write stalls. Hence, take the
* AMR value from the check above.
*/
kuap_kernel_restore(regs, kuap);
return ret;
}