select GENERIC_CPU_AUTOPROBE
select GENERIC_CPU_VULNERABILITIES if PPC_BARRIER_NOSPEC
select GENERIC_EARLY_IOREMAP
+ select GENERIC_ENTRY
select GENERIC_GETTIMEOFDAY
select GENERIC_IDLE_POLL_SETUP
select GENERIC_IOREMAP
#ifndef __ASSEMBLER__
-#include <linux/context_tracking.h>
-#include <linux/hardirq.h>
-#include <asm/cputime.h>
-#include <asm/firmware.h>
-#include <asm/ftrace.h>
+#include <linux/sched/debug.h> /* for show_regs */
+#include <linux/irq-entry-common.h>
+
#include <asm/kprobes.h>
#include <asm/runlatch.h>
#define INT_SOFT_MASK_BUG_ON(regs, cond)
#endif
-#ifdef CONFIG_PPC_BOOK3S_64
-extern char __end_soft_masked[];
-bool search_kernel_soft_mask_table(unsigned long addr);
-unsigned long search_kernel_restart_table(unsigned long addr);
-
-DECLARE_STATIC_KEY_FALSE(interrupt_exit_not_reentrant);
-
-static inline bool is_implicit_soft_masked(struct pt_regs *regs)
-{
- if (user_mode(regs))
- return false;
-
- if (regs->nip >= (unsigned long)__end_soft_masked)
- return false;
-
- return search_kernel_soft_mask_table(regs->nip);
-}
-
-static inline void srr_regs_clobbered(void)
-{
- local_paca->srr_valid = 0;
- local_paca->hsrr_valid = 0;
-}
-#else
-static inline unsigned long search_kernel_restart_table(unsigned long addr)
-{
- return 0;
-}
-
-static inline bool is_implicit_soft_masked(struct pt_regs *regs)
-{
- return false;
-}
-
-static inline void srr_regs_clobbered(void)
-{
-}
-#endif
-
-static inline void nap_adjust_return(struct pt_regs *regs)
-{
-#ifdef CONFIG_PPC_970_NAP
- if (unlikely(test_thread_local_flags(_TLF_NAPPING))) {
- /* Can avoid a test-and-clear because NMIs do not call this */
- clear_thread_local_flags(_TLF_NAPPING);
- regs_set_return_ip(regs, (unsigned long)power4_idle_nap_return);
- }
-#endif
-}
-
-static inline void booke_restore_dbcr0(void)
-{
-#ifdef CONFIG_PPC_ADV_DEBUG_REGS
- unsigned long dbcr0 = current->thread.debug.dbcr0;
-
- if (IS_ENABLED(CONFIG_PPC32) && unlikely(dbcr0 & DBCR0_IDM)) {
- mtspr(SPRN_DBSR, -1);
- mtspr(SPRN_DBCR0, global_dbcr0[smp_processor_id()]);
- }
-#endif
-}
-
-static inline void interrupt_enter_prepare(struct pt_regs *regs)
-{
-#ifdef CONFIG_PPC64
- irq_soft_mask_set(IRQS_ALL_DISABLED);
-
- /*
- * If the interrupt was taken with HARD_DIS clear, then enable MSR[EE].
- * Asynchronous interrupts get here with HARD_DIS set (see below), so
- * this enables MSR[EE] for synchronous interrupts. IRQs remain
- * soft-masked. The interrupt handler may later call
- * interrupt_cond_local_irq_enable() to achieve a regular process
- * context.
- */
- if (!(local_paca->irq_happened & PACA_IRQ_HARD_DIS)) {
- INT_SOFT_MASK_BUG_ON(regs, !(regs->msr & MSR_EE));
- __hard_irq_enable();
- } else {
- __hard_RI_enable();
- }
- /* Enable MSR[RI] early, to support kernel SLB and hash faults */
-#endif
-
- if (!regs_irqs_disabled(regs))
- trace_hardirqs_off();
-
- if (user_mode(regs)) {
- kuap_lock();
- CT_WARN_ON(ct_state() != CT_STATE_USER);
- user_exit_irqoff();
-
- account_cpu_user_entry();
- account_stolen_time();
- } else {
- kuap_save_and_lock(regs);
- /*
- * CT_WARN_ON comes here via program_check_exception,
- * so avoid recursion.
- */
- if (TRAP(regs) != INTERRUPT_PROGRAM)
- CT_WARN_ON(ct_state() != CT_STATE_KERNEL &&
- ct_state() != CT_STATE_IDLE);
- INT_SOFT_MASK_BUG_ON(regs, is_implicit_soft_masked(regs));
- INT_SOFT_MASK_BUG_ON(regs, regs_irqs_disabled(regs) &&
- search_kernel_restart_table(regs->nip));
- }
- INT_SOFT_MASK_BUG_ON(regs, !regs_irqs_disabled(regs) &&
- !(regs->msr & MSR_EE));
-
- booke_restore_dbcr0();
-}
-
-/*
- * Care should be taken to note that interrupt_exit_prepare and
- * interrupt_async_exit_prepare do not necessarily return immediately to
- * regs context (e.g., if regs is usermode, we don't necessarily return to
- * user mode). Other interrupts might be taken between here and return,
- * context switch / preemption may occur in the exit path after this, or a
- * signal may be delivered, etc.
- *
- * The real interrupt exit code is platform specific, e.g.,
- * interrupt_exit_user_prepare / interrupt_exit_kernel_prepare for 64s.
- *
- * However interrupt_nmi_exit_prepare does return directly to regs, because
- * NMIs do not do "exit work" or replay soft-masked interrupts.
- */
-static inline void interrupt_exit_prepare(struct pt_regs *regs)
-{
-}
-
-static inline void interrupt_async_enter_prepare(struct pt_regs *regs)
-{
-#ifdef CONFIG_PPC64
- /* Ensure interrupt_enter_prepare does not enable MSR[EE] */
- local_paca->irq_happened |= PACA_IRQ_HARD_DIS;
-#endif
- interrupt_enter_prepare(regs);
-#ifdef CONFIG_PPC_BOOK3S_64
- /*
- * RI=1 is set by interrupt_enter_prepare, so this thread flags access
- * has to come afterward (it can cause SLB faults).
- */
- if (cpu_has_feature(CPU_FTR_CTRL) &&
- !test_thread_local_flags(_TLF_RUNLATCH))
- __ppc64_runlatch_on();
-#endif
- irq_enter();
-}
-
-static inline void interrupt_async_exit_prepare(struct pt_regs *regs)
-{
- /*
- * Adjust at exit so the main handler sees the true NIA. This must
- * come before irq_exit() because irq_exit can enable interrupts, and
- * if another interrupt is taken before nap_adjust_return has run
- * here, then that interrupt would return directly to idle nap return.
- */
- nap_adjust_return(regs);
-
- irq_exit();
- interrupt_exit_prepare(regs);
-}
-
-struct interrupt_nmi_state {
-#ifdef CONFIG_PPC64
- u8 irq_soft_mask;
- u8 irq_happened;
- u8 ftrace_enabled;
- u64 softe;
-#endif
-};
-
-static inline bool nmi_disables_ftrace(struct pt_regs *regs)
-{
- /* Allow DEC and PMI to be traced when they are soft-NMI */
- if (IS_ENABLED(CONFIG_PPC_BOOK3S_64)) {
- if (TRAP(regs) == INTERRUPT_DECREMENTER)
- return false;
- if (TRAP(regs) == INTERRUPT_PERFMON)
- return false;
- }
- if (IS_ENABLED(CONFIG_PPC_BOOK3E_64)) {
- if (TRAP(regs) == INTERRUPT_PERFMON)
- return false;
- }
-
- return true;
-}
-
-static inline void interrupt_nmi_enter_prepare(struct pt_regs *regs, struct interrupt_nmi_state *state)
-{
-#ifdef CONFIG_PPC64
- state->irq_soft_mask = local_paca->irq_soft_mask;
- state->irq_happened = local_paca->irq_happened;
- state->softe = regs->softe;
-
- /*
- * Set IRQS_ALL_DISABLED unconditionally so irqs_disabled() does
- * the right thing, and set IRQ_HARD_DIS. We do not want to reconcile
- * because that goes through irq tracing which we don't want in NMI.
- */
- local_paca->irq_soft_mask = IRQS_ALL_DISABLED;
- local_paca->irq_happened |= PACA_IRQ_HARD_DIS;
-
- if (!(regs->msr & MSR_EE) || is_implicit_soft_masked(regs)) {
- /*
- * Adjust regs->softe to be soft-masked if it had not been
- * reconcied (e.g., interrupt entry with MSR[EE]=0 but softe
- * not yet set disabled), or if it was in an implicit soft
- * masked state. This makes regs_irqs_disabled(regs)
- * behave as expected.
- */
- regs->softe = IRQS_ALL_DISABLED;
- }
-
- __hard_RI_enable();
-
- /* Don't do any per-CPU operations until interrupt state is fixed */
-
- if (nmi_disables_ftrace(regs)) {
- state->ftrace_enabled = this_cpu_get_ftrace_enabled();
- this_cpu_set_ftrace_enabled(0);
- }
-#endif
-
- /* If data relocations are enabled, it's safe to use nmi_enter() */
- if (mfmsr() & MSR_DR) {
- nmi_enter();
- return;
- }
-
- /*
- * But do not use nmi_enter() for pseries hash guest taking a real-mode
- * NMI because not everything it touches is within the RMA limit.
- */
- if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) &&
- firmware_has_feature(FW_FEATURE_LPAR) &&
- !radix_enabled())
- return;
-
- /*
- * Likewise, don't use it if we have some form of instrumentation (like
- * KASAN shadow) that is not safe to access in real mode (even on radix)
- */
- if (IS_ENABLED(CONFIG_KASAN))
- return;
-
- /*
- * Likewise, do not use it in real mode if percpu first chunk is not
- * embedded. With CONFIG_NEED_PER_CPU_PAGE_FIRST_CHUNK enabled there
- * are chances where percpu allocation can come from vmalloc area.
- */
- if (percpu_first_chunk_is_paged)
- return;
-
- /* Otherwise, it should be safe to call it */
- nmi_enter();
-}
-
-static inline void interrupt_nmi_exit_prepare(struct pt_regs *regs, struct interrupt_nmi_state *state)
-{
- if (mfmsr() & MSR_DR) {
- // nmi_exit if relocations are on
- nmi_exit();
- } else if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) &&
- firmware_has_feature(FW_FEATURE_LPAR) &&
- !radix_enabled()) {
- // no nmi_exit for a pseries hash guest taking a real mode exception
- } else if (IS_ENABLED(CONFIG_KASAN)) {
- // no nmi_exit for KASAN in real mode
- } else if (percpu_first_chunk_is_paged) {
- // no nmi_exit if percpu first chunk is not embedded
- } else {
- nmi_exit();
- }
-
- /*
- * nmi does not call nap_adjust_return because nmi should not create
- * new work to do (must use irq_work for that).
- */
-
-#ifdef CONFIG_PPC64
-#ifdef CONFIG_PPC_BOOK3S
- if (regs_irqs_disabled(regs)) {
- unsigned long rst = search_kernel_restart_table(regs->nip);
- if (rst)
- regs_set_return_ip(regs, rst);
- }
-#endif
-
- if (nmi_disables_ftrace(regs))
- this_cpu_set_ftrace_enabled(state->ftrace_enabled);
-
- /* Check we didn't change the pending interrupt mask. */
- WARN_ON_ONCE((state->irq_happened | PACA_IRQ_HARD_DIS) != local_paca->irq_happened);
- regs->softe = state->softe;
- local_paca->irq_happened = state->irq_happened;
- local_paca->irq_soft_mask = state->irq_soft_mask;
-#endif
-}
-
/*
* Don't use noinstr here like x86, but rather add NOKPROBE_SYMBOL to each
* function definition. The reason for this is the noinstr section is placed
\
interrupt_handler void func(struct pt_regs *regs) \
{ \
- interrupt_enter_prepare(regs); \
- \
+ irqentry_state_t state; \
+ arch_interrupt_enter_prepare(regs); \
+ state = irqentry_enter(regs); \
+ instrumentation_begin(); \
____##func (regs); \
- \
- interrupt_exit_prepare(regs); \
+ instrumentation_end(); \
+ arch_interrupt_exit_prepare(regs); \
+ irqentry_exit(regs, state); \
} \
NOKPROBE_SYMBOL(func); \
\
interrupt_handler long func(struct pt_regs *regs) \
{ \
long ret; \
+ irqentry_state_t state; \
\
- interrupt_enter_prepare(regs); \
- \
+ arch_interrupt_enter_prepare(regs); \
+ state = irqentry_enter(regs); \
+ instrumentation_begin(); \
ret = ____##func (regs); \
- \
- interrupt_exit_prepare(regs); \
+ instrumentation_end(); \
+ arch_interrupt_exit_prepare(regs); \
+ irqentry_exit(regs, state); \
\
return ret; \
} \
\
interrupt_handler void func(struct pt_regs *regs) \
{ \
- interrupt_async_enter_prepare(regs); \
- \
+ irqentry_state_t state; \
+ arch_interrupt_async_enter_prepare(regs); \
+ state = irqentry_enter(regs); \
+ instrumentation_begin(); \
+ irq_enter_rcu(); \
____##func (regs); \
- \
- interrupt_async_exit_prepare(regs); \
+ irq_exit_rcu(); \
+ instrumentation_end(); \
+ arch_interrupt_async_exit_prepare(regs); \
+ irqentry_exit(regs, state); \
} \
NOKPROBE_SYMBOL(func); \
\
\
interrupt_handler long func(struct pt_regs *regs) \
{ \
- struct interrupt_nmi_state state; \
+ irqentry_state_t state; \
+ struct interrupt_nmi_state nmi_state; \
long ret; \
\
- interrupt_nmi_enter_prepare(regs, &state); \
- \
+ arch_interrupt_nmi_enter_prepare(regs, &nmi_state); \
+ if (mfmsr() & MSR_DR) { \
+ /* nmi_entry if relocations are on */ \
+ state = irqentry_nmi_enter(regs); \
+ } else if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && \
+ firmware_has_feature(FW_FEATURE_LPAR) && \
+ !radix_enabled()) { \
+ /* no nmi_entry for a pseries hash guest \
+ * taking a real mode exception */ \
+ } else if (IS_ENABLED(CONFIG_KASAN)) { \
+ /* no nmi_entry for KASAN in real mode */ \
+ } else if (percpu_first_chunk_is_paged) { \
+ /* no nmi_entry if percpu first chunk is not embedded */\
+ } else { \
+ state = irqentry_nmi_enter(regs); \
+ } \
ret = ____##func (regs); \
- \
- interrupt_nmi_exit_prepare(regs, &state); \
+ arch_interrupt_nmi_exit_prepare(regs, &nmi_state); \
+ if (mfmsr() & MSR_DR) { \
+ /* nmi_exit if relocations are on */ \
+ irqentry_nmi_exit(regs, state); \
+ } else if (IS_ENABLED(CONFIG_PPC_BOOK3S_64) && \
+ firmware_has_feature(FW_FEATURE_LPAR) && \
+ !radix_enabled()) { \
+ /* no nmi_exit for a pseries hash guest \
+ * taking a real mode exception */ \
+ } else if (IS_ENABLED(CONFIG_KASAN)) { \
+ /* no nmi_exit for KASAN in real mode */ \
+ } else if (percpu_first_chunk_is_paged) { \
+ /* no nmi_exit if percpu first chunk is not embedded */ \
+ } else { \
+ irqentry_nmi_exit(regs, state); \
+ } \
\
return ret; \
} \
#define __ASM_KASAN_H
#if defined(CONFIG_KASAN) && !defined(CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX)
-#define _GLOBAL_KASAN(fn) _GLOBAL(__##fn)
-#define _GLOBAL_TOC_KASAN(fn) _GLOBAL_TOC(__##fn)
-#define EXPORT_SYMBOL_KASAN(fn) EXPORT_SYMBOL(__##fn)
-#else
+#define _GLOBAL_KASAN(fn) \
+ _GLOBAL(fn); \
+ _GLOBAL(__##fn)
+#define _GLOBAL_TOC_KASAN(fn) \
+ _GLOBAL_TOC(fn); \
+ _GLOBAL_TOC(__##fn)
+#define EXPORT_SYMBOL_KASAN(fn) \
+ EXPORT_SYMBOL(__##fn)
+#else /* CONFIG_KASAN && !CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX */
#define _GLOBAL_KASAN(fn) _GLOBAL(fn)
#define _GLOBAL_TOC_KASAN(fn) _GLOBAL_TOC(fn)
#define EXPORT_SYMBOL_KASAN(fn)
-#endif
+#endif /* CONFIG_KASAN && !CONFIG_CC_HAS_KASAN_MEMINTRINSIC_PREFIX */
#ifndef __ASSEMBLER__
// SPDX-License-Identifier: GPL-2.0-or-later
#include <linux/context_tracking.h>
+#include <linux/entry-common.h>
#include <linux/err.h>
#include <linux/compat.h>
#include <linux/rseq.h>
unsigned long global_dbcr0[NR_CPUS];
#endif
-#if defined(CONFIG_PREEMPT_DYNAMIC)
-DEFINE_STATIC_KEY_TRUE(sk_dynamic_irqentry_exit_cond_resched);
-#endif
-
#ifdef CONFIG_PPC_BOOK3S_64
DEFINE_STATIC_KEY_FALSE(interrupt_exit_not_reentrant);
static inline bool exit_must_hard_disable(void)
return true;
}
-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
-}
-
-static notrace void check_return_regs_valid(struct pt_regs *regs)
-{
-#ifdef CONFIG_PPC_BOOK3S_64
- unsigned long trap, srr0, srr1;
- static bool warned;
- u8 *validp;
- char *h;
-
- if (trap_is_scv(regs))
- return;
-
- trap = TRAP(regs);
- // EE in HV mode sets HSRRs like 0xea0
- if (cpu_has_feature(CPU_FTR_HVMODE) && trap == INTERRUPT_EXTERNAL)
- trap = 0xea0;
-
- switch (trap) {
- case 0x980:
- case INTERRUPT_H_DATA_STORAGE:
- case 0xe20:
- case 0xe40:
- case INTERRUPT_HMI:
- case 0xe80:
- case 0xea0:
- case INTERRUPT_H_FAC_UNAVAIL:
- case 0x1200:
- case 0x1500:
- case 0x1600:
- case 0x1800:
- validp = &local_paca->hsrr_valid;
- if (!READ_ONCE(*validp))
- return;
-
- srr0 = mfspr(SPRN_HSRR0);
- srr1 = mfspr(SPRN_HSRR1);
- h = "H";
-
- break;
- default:
- validp = &local_paca->srr_valid;
- if (!READ_ONCE(*validp))
- return;
-
- srr0 = mfspr(SPRN_SRR0);
- srr1 = mfspr(SPRN_SRR1);
- h = "";
- break;
- }
-
- if (srr0 == regs->nip && srr1 == regs->msr)
- return;
-
- /*
- * A NMI / soft-NMI interrupt may have come in after we found
- * srr_valid and before the SRRs are loaded. The interrupt then
- * comes in and clobbers SRRs and clears srr_valid. Then we load
- * the SRRs here and test them above and find they don't match.
- *
- * Test validity again after that, to catch such false positives.
- *
- * This test in general will have some window for false negatives
- * and may not catch and fix all such cases if an NMI comes in
- * later and clobbers SRRs without clearing srr_valid, but hopefully
- * such things will get caught most of the time, statistically
- * enough to be able to get a warning out.
- */
- if (!READ_ONCE(*validp))
- return;
-
- if (!data_race(warned)) {
- data_race(warned = true);
- printk("%sSRR0 was: %lx should be: %lx\n", h, srr0, regs->nip);
- printk("%sSRR1 was: %lx should be: %lx\n", h, srr1, regs->msr);
- show_regs(regs);
- }
-
- WRITE_ONCE(*validp, 0); /* fixup */
-#endif
-}
-
-static notrace unsigned long
-interrupt_exit_user_prepare_main(unsigned long ret, struct pt_regs *regs)
-{
- unsigned long ti_flags;
-
-again:
- ti_flags = read_thread_flags();
- while (unlikely(ti_flags & (_TIF_USER_WORK_MASK & ~_TIF_RESTORE_TM))) {
- local_irq_enable();
- if (ti_flags & (_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY)) {
- 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_thread_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);
- }
- }
-
- check_return_regs_valid(regs);
-
- user_enter_irqoff();
- if (!prep_irq_for_enabled_exit(true)) {
- 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);
-
- return ret;
-}
-
/*
* 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
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() == CT_STATE_USER);
-
kuap_assert_locked();
regs->result = r3;
-
- /* Check whether the syscall is issued inside a restartable sequence */
- rseq_syscall(regs);
+ regs->exit_flags = 0;
ti_flags = read_thread_flags();
if (unlikely(ti_flags & _TIF_PERSYSCALL_MASK)) {
if (ti_flags & _TIF_RESTOREALL)
- ret = _TIF_RESTOREALL;
+ regs->exit_flags = _TIF_RESTOREALL;
else
regs->gpr[3] = r3;
clear_bits(_TIF_PERSYSCALL_MASK, ¤t_thread_info()->flags);
}
if (unlikely(ti_flags & _TIF_SYSCALL_DOTRACE)) {
- do_syscall_trace_leave(regs);
- ret |= _TIF_RESTOREALL;
+ regs->exit_flags |= _TIF_RESTOREALL;
}
- local_irq_disable();
- ret = interrupt_exit_user_prepare_main(ret, regs);
+ syscall_exit_to_user_mode(regs);
+
+again:
+ user_enter_irqoff();
+ if (!prep_irq_for_enabled_exit(true)) {
+ user_exit_irqoff();
+ local_irq_enable();
+ local_irq_disable();
+ goto again;
+ }
+
+ /* Restore user access locks last */
+ kuap_user_restore(regs);
#ifdef CONFIG_PPC64
- regs->exit_result = ret;
+ regs->exit_result = regs->exit_flags;
#endif
- return ret;
+ return regs->exit_flags;
}
#ifdef CONFIG_PPC64
set_kuap(AMR_KUAP_BLOCKED);
#endif
- trace_hardirqs_off();
- user_exit_irqoff();
- account_cpu_user_entry();
-
- BUG_ON(!user_mode(regs));
+again:
+ user_enter_irqoff();
+ if (!prep_irq_for_enabled_exit(true)) {
+ user_exit_irqoff();
+ local_irq_enable();
+ local_irq_disable();
+ goto again;
+ }
- regs->exit_result = interrupt_exit_user_prepare_main(regs->exit_result, regs);
+ regs->exit_result |= regs->exit_flags;
return regs->exit_result;
}
BUG_ON(regs_is_unrecoverable(regs));
BUG_ON(regs_irqs_disabled(regs));
- CT_WARN_ON(ct_state() == CT_STATE_USER);
/*
* We don't need to restore AMR on the way back to userspace for KUAP.
kuap_assert_locked();
local_irq_disable();
+ regs->exit_flags = 0;
+again:
+ check_return_regs_valid(regs);
+ user_enter_irqoff();
+ if (!prep_irq_for_enabled_exit(true)) {
+ user_exit_irqoff();
+ local_irq_enable();
+ local_irq_disable();
+ goto again;
+ }
+
+ /* Restore user access locks last */
+ kuap_user_restore(regs);
- ret = interrupt_exit_user_prepare_main(0, regs);
+ ret = regs->exit_flags;
#ifdef CONFIG_PPC64
regs->exit_result = ret;
/* Returning to a kernel context with local irqs enabled. */
WARN_ON_ONCE(!(regs->msr & MSR_EE));
again:
- if (need_irq_preemption()) {
- /* Return to preemptible kernel context */
- if (unlikely(read_thread_flags() & _TIF_NEED_RESCHED)) {
- if (preempt_count() == 0)
- preempt_schedule_irq();
- }
- }
check_return_regs_valid(regs);
#endif
trace_hardirqs_off();
- user_exit_irqoff();
account_cpu_user_entry();
BUG_ON(!user_mode(regs));
#include <asm/switch_to.h>
#include <asm/debug.h>
-#define CREATE_TRACE_POINTS
-#include <trace/events/syscalls.h>
-
#include "ptrace-decl.h"
/*
* Extracted from signal_32.c and signal_64.c
*/
+#include <linux/entry-common.h>
#include <linux/resume_user_mode.h>
#include <linux/signal.h>
#include <linux/uprobes.h>
printk_ratelimited(regs->msr & MSR_64BIT ? fm64 : fm32, tsk->comm,
task_pid_nr(tsk), where, ptr, regs->nip, regs->link);
}
+
+void arch_do_signal_or_restart(struct pt_regs *regs)
+{
+ BUG_ON(regs != current->thread.regs);
+ regs->exit_flags |= _TIF_RESTOREALL;
+ do_signal(current);
+}
#include <linux/compat.h>
#include <linux/context_tracking.h>
#include <linux/randomize_kstack.h>
+#include <linux/entry-common.h>
#include <asm/interrupt.h>
#include <asm/kup.h>
long ret;
syscall_fn f;
- kuap_lock();
-
- 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() == CT_STATE_KERNEL);
- user_exit_irqoff();
-
add_random_kstack_offset();
+ r0 = syscall_enter_from_user_mode(regs, r0);
- BUG_ON(regs_is_unrecoverable(regs));
- BUG_ON(!user_mode(regs));
- BUG_ON(regs_irqs_disabled(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_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);
-
- /*
- * If system call is called with TM active, set _TIF_RESTOREALL to
- * prevent RFSCV being used to return to userspace, because POWER9
- * TM implementation has problems with this instruction returning to
- * transactional state. Final register values are not relevant because
- * the transaction will be aborted upon return anyway. Or in the case
- * of unsupported_scv SIGILL fault, the return state does not much
- * matter because it's an edge case.
- */
- if (IS_ENABLED(CONFIG_PPC_TRANSACTIONAL_MEM) &&
- unlikely(MSR_TM_TRANSACTIONAL(regs->msr)))
- set_bits(_TIF_RESTOREALL, ¤t_thread_info()->flags);
-
- /*
- * If the system call was made with a transaction active, doom it and
- * return without performing the system call. Unless it was an
- * unsupported scv vector, in which case it's treated like an illegal
- * instruction.
- */
-#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
- if (unlikely(MSR_TM_TRANSACTIONAL(regs->msr)) &&
- !trap_is_unsupported_scv(regs)) {
- /* Enable TM in the kernel, and disable EE (for scv) */
- hard_irq_disable();
- mtmsr(mfmsr() | MSR_TM);
-
- /* tabort, this dooms the transaction, nothing else */
- asm volatile(".long 0x7c00071d | ((%0) << 16)"
- :: "r"(TM_CAUSE_SYSCALL|TM_CAUSE_PERSISTENT));
-
- /*
- * Userspace will never see the return value. Execution will
- * resume after the tbegin. of the aborted transaction with the
- * checkpointed register state. A context switch could occur
- * or signal delivered to the process before resuming the
- * doomed transaction context, but that should all be handled
- * as expected.
- */
- return -ENOSYS;
- }
-#endif // CONFIG_PPC_TRANSACTIONAL_MEM
-
- local_irq_enable();
-
- if (unlikely(read_thread_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];
-
- } else if (unlikely(r0 >= NR_syscalls)) {
+ if (unlikely(r0 >= NR_syscalls)) {
if (unlikely(trap_is_unsupported_scv(regs))) {
/* Unsupported scv vector */
_exception(SIGILL, regs, ILL_ILLOPC, regs->nip);
projects / thirdparty / kernel / linux.git / commitdiff
