diff options
Diffstat (limited to 'arch')
27 files changed, 194 insertions, 89 deletions
diff --git a/arch/Kconfig b/arch/Kconfig index 4f55c736be1..5b448a74d0f 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -47,18 +47,29 @@ config KPROBES If in doubt, say "N". config JUMP_LABEL - bool "Optimize trace point call sites" + bool "Optimize very unlikely/likely branches" depends on HAVE_ARCH_JUMP_LABEL help + This option enables a transparent branch optimization that + makes certain almost-always-true or almost-always-false branch + conditions even cheaper to execute within the kernel. + + Certain performance-sensitive kernel code, such as trace points, + scheduler functionality, networking code and KVM have such + branches and include support for this optimization technique. + If it is detected that the compiler has support for "asm goto", - the kernel will compile trace point locations with just a - nop instruction. When trace points are enabled, the nop will - be converted to a jump to the trace function. This technique - lowers overhead and stress on the branch prediction of the - processor. - - On i386, options added to the compiler flags may increase - the size of the kernel slightly. + the kernel will compile such branches with just a nop + instruction. When the condition flag is toggled to true, the + nop will be converted to a jump instruction to execute the + conditional block of instructions. + + This technique lowers overhead and stress on the branch prediction + of the processor and generally makes the kernel faster. The update + of the condition is slower, but those are always very rare. + + ( On 32-bit x86, the necessary options added to the compiler + flags may increase the size of the kernel slightly. ) config OPTPROBES def_bool y diff --git a/arch/arm/include/asm/perf_event.h b/arch/arm/include/asm/perf_event.h index 99cfe360798..7523340afb8 100644 --- a/arch/arm/include/asm/perf_event.h +++ b/arch/arm/include/asm/perf_event.h @@ -12,10 +12,6 @@ #ifndef __ARM_PERF_EVENT_H__ #define __ARM_PERF_EVENT_H__ -/* ARM performance counters start from 1 (in the cp15 accesses) so use the - * same indexes here for consistency. */ -#define PERF_EVENT_INDEX_OFFSET 1 - /* ARM perf PMU IDs for use by internal perf clients. */ enum arm_perf_pmu_ids { ARM_PERF_PMU_ID_XSCALE1 = 0, diff --git a/arch/frv/include/asm/perf_event.h b/arch/frv/include/asm/perf_event.h index a69e0155d14..c52ea5546b5 100644 --- a/arch/frv/include/asm/perf_event.h +++ b/arch/frv/include/asm/perf_event.h @@ -12,6 +12,4 @@ #ifndef _ASM_PERF_EVENT_H #define _ASM_PERF_EVENT_H -#define PERF_EVENT_INDEX_OFFSET 0 - #endif /* _ASM_PERF_EVENT_H */ diff --git a/arch/hexagon/include/asm/perf_event.h b/arch/hexagon/include/asm/perf_event.h index 6c2910f9118..8b8526b491c 100644 --- a/arch/hexagon/include/asm/perf_event.h +++ b/arch/hexagon/include/asm/perf_event.h @@ -19,6 +19,4 @@ #ifndef _ASM_PERF_EVENT_H #define _ASM_PERF_EVENT_H -#define PERF_EVENT_INDEX_OFFSET 0 - #endif /* _ASM_PERF_EVENT_H */ diff --git a/arch/ia64/include/asm/paravirt.h b/arch/ia64/include/asm/paravirt.h index 32551d304cd..b149b88ea79 100644 --- a/arch/ia64/include/asm/paravirt.h +++ b/arch/ia64/include/asm/paravirt.h @@ -281,9 +281,9 @@ paravirt_init_missing_ticks_accounting(int cpu) pv_time_ops.init_missing_ticks_accounting(cpu); } -struct jump_label_key; -extern struct jump_label_key paravirt_steal_enabled; -extern struct jump_label_key paravirt_steal_rq_enabled; +struct static_key; +extern struct static_key paravirt_steal_enabled; +extern struct static_key paravirt_steal_rq_enabled; static inline int paravirt_do_steal_accounting(unsigned long *new_itm) diff --git a/arch/ia64/kernel/paravirt.c b/arch/ia64/kernel/paravirt.c index 100868216c5..1b22f6de293 100644 --- a/arch/ia64/kernel/paravirt.c +++ b/arch/ia64/kernel/paravirt.c @@ -634,8 +634,8 @@ struct pv_irq_ops pv_irq_ops = { * pv_time_ops * time operations */ -struct jump_label_key paravirt_steal_enabled; -struct jump_label_key paravirt_steal_rq_enabled; +struct static_key paravirt_steal_enabled; +struct static_key paravirt_steal_rq_enabled; static int ia64_native_do_steal_accounting(unsigned long *new_itm) diff --git a/arch/mips/include/asm/jump_label.h b/arch/mips/include/asm/jump_label.h index 1881b316ca4..4d6d77ed9b9 100644 --- a/arch/mips/include/asm/jump_label.h +++ b/arch/mips/include/asm/jump_label.h @@ -20,7 +20,7 @@ #define WORD_INSN ".word" #endif -static __always_inline bool arch_static_branch(struct jump_label_key *key) +static __always_inline bool arch_static_branch(struct static_key *key) { asm goto("1:\tnop\n\t" "nop\n\t" diff --git a/arch/powerpc/include/asm/jump_label.h b/arch/powerpc/include/asm/jump_label.h index 938986e412f..ae098c438f0 100644 --- a/arch/powerpc/include/asm/jump_label.h +++ b/arch/powerpc/include/asm/jump_label.h @@ -17,7 +17,7 @@ #define JUMP_ENTRY_TYPE stringify_in_c(FTR_ENTRY_LONG) #define JUMP_LABEL_NOP_SIZE 4 -static __always_inline bool arch_static_branch(struct jump_label_key *key) +static __always_inline bool arch_static_branch(struct static_key *key) { asm goto("1:\n\t" "nop\n\t" diff --git a/arch/powerpc/include/asm/perf_event_server.h b/arch/powerpc/include/asm/perf_event_server.h index 8f1df1208d2..1a8093fa8f7 100644 --- a/arch/powerpc/include/asm/perf_event_server.h +++ b/arch/powerpc/include/asm/perf_event_server.h @@ -61,8 +61,6 @@ struct pt_regs; extern unsigned long perf_misc_flags(struct pt_regs *regs); extern unsigned long perf_instruction_pointer(struct pt_regs *regs); -#define PERF_EVENT_INDEX_OFFSET 1 - /* * Only override the default definitions in include/linux/perf_event.h * if we have hardware PMU support. diff --git a/arch/powerpc/kernel/perf_event.c b/arch/powerpc/kernel/perf_event.c index 64483fde95c..f04c2301725 100644 --- a/arch/powerpc/kernel/perf_event.c +++ b/arch/powerpc/kernel/perf_event.c @@ -1193,6 +1193,11 @@ static int power_pmu_event_init(struct perf_event *event) return err; } +static int power_pmu_event_idx(struct perf_event *event) +{ + return event->hw.idx; +} + struct pmu power_pmu = { .pmu_enable = power_pmu_enable, .pmu_disable = power_pmu_disable, @@ -1205,6 +1210,7 @@ struct pmu power_pmu = { .start_txn = power_pmu_start_txn, .cancel_txn = power_pmu_cancel_txn, .commit_txn = power_pmu_commit_txn, + .event_idx = power_pmu_event_idx, }; /* diff --git a/arch/s390/include/asm/jump_label.h b/arch/s390/include/asm/jump_label.h index 95a6cf2b5b6..6c32190dc73 100644 --- a/arch/s390/include/asm/jump_label.h +++ b/arch/s390/include/asm/jump_label.h @@ -13,7 +13,7 @@ #define ASM_ALIGN ".balign 4" #endif -static __always_inline bool arch_static_branch(struct jump_label_key *key) +static __always_inline bool arch_static_branch(struct static_key *key) { asm goto("0: brcl 0,0\n" ".pushsection __jump_table, \"aw\"\n" diff --git a/arch/s390/include/asm/perf_event.h b/arch/s390/include/asm/perf_event.h index a75f168d271..4eb444edbe4 100644 --- a/arch/s390/include/asm/perf_event.h +++ b/arch/s390/include/asm/perf_event.h @@ -6,4 +6,3 @@ /* Empty, just to avoid compiling error */ -#define PERF_EVENT_INDEX_OFFSET 0 diff --git a/arch/sparc/include/asm/jump_label.h b/arch/sparc/include/asm/jump_label.h index fc73a82366f..5080d16a832 100644 --- a/arch/sparc/include/asm/jump_label.h +++ b/arch/sparc/include/asm/jump_label.h @@ -7,7 +7,7 @@ #define JUMP_LABEL_NOP_SIZE 4 -static __always_inline bool arch_static_branch(struct jump_label_key *key) +static __always_inline bool arch_static_branch(struct static_key *key) { asm goto("1:\n\t" "nop\n\t" diff --git a/arch/x86/include/asm/inat.h b/arch/x86/include/asm/inat.h index 205b063e3e3..74a2e312e8a 100644 --- a/arch/x86/include/asm/inat.h +++ b/arch/x86/include/asm/inat.h @@ -97,11 +97,12 @@ /* Attribute search APIs */ extern insn_attr_t inat_get_opcode_attribute(insn_byte_t opcode); +extern int inat_get_last_prefix_id(insn_byte_t last_pfx); extern insn_attr_t inat_get_escape_attribute(insn_byte_t opcode, - insn_byte_t last_pfx, + int lpfx_id, insn_attr_t esc_attr); extern insn_attr_t inat_get_group_attribute(insn_byte_t modrm, - insn_byte_t last_pfx, + int lpfx_id, insn_attr_t esc_attr); extern insn_attr_t inat_get_avx_attribute(insn_byte_t opcode, insn_byte_t vex_m, diff --git a/arch/x86/include/asm/insn.h b/arch/x86/include/asm/insn.h index 74df3f1eddf..48eb30a8606 100644 --- a/arch/x86/include/asm/insn.h +++ b/arch/x86/include/asm/insn.h @@ -96,12 +96,6 @@ struct insn { #define X86_VEX_P(vex) ((vex) & 0x03) /* VEX3 Byte2, VEX2 Byte1 */ #define X86_VEX_M_MAX 0x1f /* VEX3.M Maximum value */ -/* The last prefix is needed for two-byte and three-byte opcodes */ -static inline insn_byte_t insn_last_prefix(struct insn *insn) -{ - return insn->prefixes.bytes[3]; -} - extern void insn_init(struct insn *insn, const void *kaddr, int x86_64); extern void insn_get_prefixes(struct insn *insn); extern void insn_get_opcode(struct insn *insn); @@ -160,6 +154,18 @@ static inline insn_byte_t insn_vex_p_bits(struct insn *insn) return X86_VEX_P(insn->vex_prefix.bytes[2]); } +/* Get the last prefix id from last prefix or VEX prefix */ +static inline int insn_last_prefix_id(struct insn *insn) +{ + if (insn_is_avx(insn)) + return insn_vex_p_bits(insn); /* VEX_p is a SIMD prefix id */ + + if (insn->prefixes.bytes[3]) + return inat_get_last_prefix_id(insn->prefixes.bytes[3]); + + return 0; +} + /* Offset of each field from kaddr */ static inline int insn_offset_rex_prefix(struct insn *insn) { diff --git a/arch/x86/include/asm/jump_label.h b/arch/x86/include/asm/jump_label.h index a32b18ce6ea..3a16c1483b4 100644 --- a/arch/x86/include/asm/jump_label.h +++ b/arch/x86/include/asm/jump_label.h @@ -9,12 +9,12 @@ #define JUMP_LABEL_NOP_SIZE 5 -#define JUMP_LABEL_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t" +#define STATIC_KEY_INITIAL_NOP ".byte 0xe9 \n\t .long 0\n\t" -static __always_inline bool arch_static_branch(struct jump_label_key *key) +static __always_inline bool arch_static_branch(struct static_key *key) { asm goto("1:" - JUMP_LABEL_INITIAL_NOP + STATIC_KEY_INITIAL_NOP ".pushsection __jump_table, \"aw\" \n\t" _ASM_ALIGN "\n\t" _ASM_PTR "1b, %l[l_yes], %c0 \n\t" diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h index a7d2db9a74f..c0180fd372d 100644 --- a/arch/x86/include/asm/paravirt.h +++ b/arch/x86/include/asm/paravirt.h @@ -230,9 +230,9 @@ static inline unsigned long long paravirt_sched_clock(void) return PVOP_CALL0(unsigned long long, pv_time_ops.sched_clock); } -struct jump_label_key; -extern struct jump_label_key paravirt_steal_enabled; -extern struct jump_label_key paravirt_steal_rq_enabled; +struct static_key; +extern struct static_key paravirt_steal_enabled; +extern struct static_key paravirt_steal_rq_enabled; static inline u64 paravirt_steal_clock(int cpu) { diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h index 461ce432b1c..e8fb2c7a5f4 100644 --- a/arch/x86/include/asm/perf_event.h +++ b/arch/x86/include/asm/perf_event.h @@ -188,8 +188,6 @@ extern u32 get_ibs_caps(void); #ifdef CONFIG_PERF_EVENTS extern void perf_events_lapic_init(void); -#define PERF_EVENT_INDEX_OFFSET 0 - /* * Abuse bit 3 of the cpu eflags register to indicate proper PEBS IP fixups. * This flag is otherwise unused and ABI specified to be 0, so nobody should diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c index f4773f4aae3..0a44b90602b 100644 --- a/arch/x86/kernel/cpu/amd.c +++ b/arch/x86/kernel/cpu/amd.c @@ -5,6 +5,7 @@ #include <linux/mm.h> #include <linux/io.h> +#include <linux/sched.h> #include <asm/processor.h> #include <asm/apic.h> #include <asm/cpu.h> @@ -456,6 +457,8 @@ static void __cpuinit early_init_amd(struct cpuinfo_x86 *c) if (c->x86_power & (1 << 8)) { set_cpu_cap(c, X86_FEATURE_CONSTANT_TSC); set_cpu_cap(c, X86_FEATURE_NONSTOP_TSC); + if (!check_tsc_unstable()) + sched_clock_stable = 1; } #ifdef CONFIG_X86_64 diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c index 5adce1040b1..f8bddb5b060 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -24,6 +24,7 @@ #include <linux/slab.h> #include <linux/cpu.h> #include <linux/bitops.h> +#include <linux/device.h> #include <asm/apic.h> #include <asm/stacktrace.h> @@ -31,6 +32,7 @@ #include <asm/compat.h> #include <asm/smp.h> #include <asm/alternative.h> +#include <asm/timer.h> #include "perf_event.h" @@ -1210,6 +1212,8 @@ x86_pmu_notifier(struct notifier_block *self, unsigned long action, void *hcpu) break; case CPU_STARTING: + if (x86_pmu.attr_rdpmc) + set_in_cr4(X86_CR4_PCE); if (x86_pmu.cpu_starting) x86_pmu.cpu_starting(cpu); break; @@ -1319,6 +1323,8 @@ static int __init init_hw_perf_events(void) } } + x86_pmu.attr_rdpmc = 1; /* enable userspace RDPMC usage by default */ + pr_info("... version: %d\n", x86_pmu.version); pr_info("... bit width: %d\n", x86_pmu.cntval_bits); pr_info("... generic registers: %d\n", x86_pmu.num_counters); @@ -1542,10 +1548,71 @@ static int x86_pmu_event_init(struct perf_event *event) return err; } +static int x86_pmu_event_idx(struct perf_event *event) +{ + int idx = event->hw.idx; + + if (x86_pmu.num_counters_fixed && idx >= X86_PMC_IDX_FIXED) { + idx -= X86_PMC_IDX_FIXED; + idx |= 1 << 30; + } + + return idx + 1; +} + +static ssize_t get_attr_rdpmc(struct device *cdev, + struct device_attribute *attr, + char *buf) +{ + return snprintf(buf, 40, "%d\n", x86_pmu.attr_rdpmc); +} + +static void change_rdpmc(void *info) +{ + bool enable = !!(unsigned long)info; + + if (enable) + set_in_cr4(X86_CR4_PCE); + else + clear_in_cr4(X86_CR4_PCE); +} + +static ssize_t set_attr_rdpmc(struct device *cdev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + unsigned long val = simple_strtoul(buf, NULL, 0); + + if (!!val != !!x86_pmu.attr_rdpmc) { + x86_pmu.attr_rdpmc = !!val; + smp_call_function(change_rdpmc, (void *)val, 1); + } + + return count; +} + +static DEVICE_ATTR(rdpmc, S_IRUSR | S_IWUSR, get_attr_rdpmc, set_attr_rdpmc); + +static struct attribute *x86_pmu_attrs[] = { + &dev_attr_rdpmc.attr, + NULL, +}; + +static struct attribute_group x86_pmu_attr_group = { + .attrs = x86_pmu_attrs, +}; + +static const struct attribute_group *x86_pmu_attr_groups[] = { + &x86_pmu_attr_group, + NULL, +}; + static struct pmu pmu = { .pmu_enable = x86_pmu_enable, .pmu_disable = x86_pmu_disable, + .attr_groups = x86_pmu_attr_groups, + .event_init = x86_pmu_event_init, .add = x86_pmu_add, @@ -1557,8 +1624,23 @@ static struct pmu pmu = { .start_txn = x86_pmu_start_txn, .cancel_txn = x86_pmu_cancel_txn, .commit_txn = x86_pmu_commit_txn, + + .event_idx = x86_pmu_event_idx, }; +void perf_update_user_clock(struct perf_event_mmap_page *userpg, u64 now) +{ + if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) + return; + + if (!boot_cpu_has(X86_FEATURE_NONSTOP_TSC)) + return; + + userpg->time_mult = this_cpu_read(cyc2ns); + userpg->time_shift = CYC2NS_SCALE_FACTOR; + userpg->time_offset = this_cpu_read(cyc2ns_offset) - now; +} + /* * callchain support */ diff --git a/arch/x86/kernel/cpu/perf_event.h b/arch/x86/kernel/cpu/perf_event.h index c30c807ddc7..82db83b5c3b 100644 --- a/arch/x86/kernel/cpu/perf_event.h +++ b/arch/x86/kernel/cpu/perf_event.h @@ -309,6 +309,14 @@ struct x86_pmu { struct x86_pmu_quirk *quirks; int perfctr_second_write; + /* + * sysfs attrs + */ + int attr_rdpmc; + + /* + * CPU Hotplug hooks + */ int (*cpu_prepare)(int cpu); void (*cpu_starting)(int cpu); void (*cpu_dying)(int cpu); diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c index f0c6fd6f176..694d801bf60 100644 --- a/arch/x86/kernel/kvm.c +++ b/arch/x86/kernel/kvm.c @@ -438,9 +438,9 @@ void __init kvm_guest_init(void) static __init int activate_jump_labels(void) { if (has_steal_clock) { - jump_label_inc(¶virt_steal_enabled); + static_key_slow_inc(¶virt_steal_enabled); if (steal_acc) - jump_label_inc(¶virt_steal_rq_enabled); + static_key_slow_inc(¶virt_steal_rq_enabled); } return 0; diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c index d90272e6bc4..ada2f99388d 100644 --- a/arch/x86/kernel/paravirt.c +++ b/arch/x86/kernel/paravirt.c @@ -202,8 +202,8 @@ static void native_flush_tlb_single(unsigned long addr) __native_flush_tlb_single(addr); } -struct jump_label_key paravirt_steal_enabled; -struct jump_label_key paravirt_steal_rq_enabled; +struct static_key paravirt_steal_enabled; +struct static_key paravirt_steal_rq_enabled; static u64 native_steal_clock(int cpu) { diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index 15763af7bfe..44eefde9210 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -377,8 +377,8 @@ static inline int hlt_use_halt(void) void default_idle(void) { if (hlt_use_halt()) { - trace_power_start(POWER_CSTATE, 1, smp_processor_id()); - trace_cpu_idle(1, smp_processor_id()); + trace_power_start_rcuidle(POWER_CSTATE, 1, smp_processor_id()); + trace_cpu_idle_rcuidle(1, smp_processor_id()); current_thread_info()->status &= ~TS_POLLING; /* * TS_POLLING-cleared state must be visible before we @@ -391,8 +391,8 @@ void default_idle(void) else local_irq_enable(); current_thread_info()->status |= TS_POLLING; - trace_power_end(smp_processor_id()); - trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id()); + trace_power_end_rcuidle(smp_processor_id()); + trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id()); } else { local_irq_enable(); /* loop is done by the caller */ @@ -450,8 +450,8 @@ EXPORT_SYMBOL_GPL(cpu_idle_wait); static void mwait_idle(void) { if (!need_resched()) { - trace_power_start(POWER_CSTATE, 1, smp_processor_id()); - trace_cpu_idle(1, smp_processor_id()); + trace_power_start_rcuidle(POWER_CSTATE, 1, smp_processor_id()); + trace_cpu_idle_rcuidle(1, smp_processor_id()); if (this_cpu_has(X86_FEATURE_CLFLUSH_MONITOR)) clflush((void *)¤t_thread_info()->flags); @@ -461,8 +461,8 @@ static void mwait_idle(void) __sti_mwait(0, 0); else local_irq_enable(); - trace_power_end(smp_processor_id()); - trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id()); + trace_power_end_rcuidle(smp_processor_id()); + trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id()); } else local_irq_enable(); } @@ -474,13 +474,13 @@ static void mwait_idle(void) */ static void poll_idle(void) { - trace_power_start(POWER_CSTATE, 0, smp_processor_id()); - trace_cpu_idle(0, smp_processor_id()); + trace_power_start_rcuidle(POWER_CSTATE, 0, smp_processor_id()); + trace_cpu_idle_rcuidle(0, smp_processor_id()); local_irq_enable(); while (!need_resched()) cpu_relax(); - trace_power_end(smp_processor_id()); - trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id()); + trace_power_end_rcuidle(smp_processor_id()); + trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id()); } /* diff --git a/arch/x86/kvm/mmu_audit.c b/arch/x86/kvm/mmu_audit.c index fe15dcc07a6..ea7b4fd3467 100644 --- a/arch/x86/kvm/mmu_audit.c +++ b/arch/x86/kvm/mmu_audit.c @@ -234,7 +234,7 @@ static void audit_vcpu_spte(struct kvm_vcpu *vcpu) } static bool mmu_audit; -static struct jump_label_key mmu_audit_key; +static struct static_key mmu_audit_key; static void __kvm_mmu_audit(struct kvm_vcpu *vcpu, int point) { @@ -250,7 +250,7 @@ static void __kvm_mmu_audit(struct kvm_vcpu *vcpu, int point) static inline void kvm_mmu_audit(struct kvm_vcpu *vcpu, int point) { - if (static_branch((&mmu_audit_key))) + if (static_key_false((&mmu_audit_key))) __kvm_mmu_audit(vcpu, point); } @@ -259,7 +259,7 @@ static void mmu_audit_enable(void) if (mmu_audit) return; - jump_label_inc(&mmu_audit_key); + static_key_slow_inc(&mmu_audit_key); mmu_audit = true; } @@ -268,7 +268,7 @@ static void mmu_audit_disable(void) if (!mmu_audit) return; - jump_label_dec(&mmu_audit_key); + static_key_slow_dec(&mmu_audit_key); mmu_audit = false; } diff --git a/arch/x86/lib/inat.c b/arch/x86/lib/inat.c index 88ad5fbda6e..c1f01a8e9f6 100644 --- a/arch/x86/lib/inat.c +++ b/arch/x86/lib/inat.c @@ -29,46 +29,46 @@ insn_attr_t inat_get_opcode_attribute(insn_byte_t opcode) return inat_primary_table[opcode]; } -insn_attr_t inat_get_escape_attribute(insn_byte_t opcode, insn_byte_t last_pfx, +int inat_get_last_prefix_id(insn_byte_t last_pfx) +{ + insn_attr_t lpfx_attr; + + lpfx_attr = inat_get_opcode_attribute(last_pfx); + return inat_last_prefix_id(lpfx_attr); +} + +insn_attr_t inat_get_escape_attribute(insn_byte_t opcode, int lpfx_id, insn_attr_t esc_attr) { const insn_attr_t *table; - insn_attr_t lpfx_attr; - int n, m = 0; + int n; n = inat_escape_id(esc_attr); - if (last_pfx) { - lpfx_attr = inat_get_opcode_attribute(last_pfx); - m = inat_last_prefix_id(lpfx_attr); - } + table = inat_escape_tables[n][0]; if (!table) return 0; - if (inat_has_variant(table[opcode]) && m) { - table = inat_escape_tables[n][m]; + if (inat_has_variant(table[opcode]) && lpfx_id) { + table = inat_escape_tables[n][lpfx_id]; if (!table) return 0; } return table[opcode]; } -insn_attr_t inat_get_group_attribute(insn_byte_t modrm, insn_byte_t last_pfx, +insn_attr_t inat_get_group_attribute(insn_byte_t modrm, int lpfx_id, insn_attr_t grp_attr) { const insn_attr_t *table; - insn_attr_t lpfx_attr; - int n, m = 0; + int n; n = inat_group_id(grp_attr); - if (last_pfx) { - lpfx_attr = inat_get_opcode_attribute(last_pfx); - m = inat_last_prefix_id(lpfx_attr); - } + table = inat_group_tables[n][0]; if (!table) return inat_group_common_attribute(grp_attr); - if (inat_has_variant(table[X86_MODRM_REG(modrm)]) && m) { - table = inat_group_tables[n][m]; + if (inat_has_variant(table[X86_MODRM_REG(modrm)]) && lpfx_id) { + table = inat_group_tables[n][lpfx_id]; if (!table) return inat_group_common_attribute(grp_attr); } diff --git a/arch/x86/lib/insn.c b/arch/x86/lib/insn.c index 5a1f9f3e3fb..25feb1ae71c 100644 --- a/arch/x86/lib/insn.c +++ b/arch/x86/lib/insn.c @@ -185,7 +185,8 @@ err_out: void insn_get_opcode(struct insn *insn) { struct insn_field *opcode = &insn->opcode; - insn_byte_t op, pfx; + insn_byte_t op; + int pfx_id; if (opcode->got) return; if (!insn->prefixes.got) @@ -212,8 +213,8 @@ void insn_get_opcode(struct insn *insn) /* Get escaped opcode */ op = get_next(insn_byte_t, insn); opcode->bytes[opcode->nbytes++] = op; - pfx = insn_last_prefix(insn); - insn->attr = inat_get_escape_attribute(op, pfx, insn->attr); + pfx_id = insn_last_prefix_id(insn); + insn->attr = inat_get_escape_attribute(op, pfx_id, insn->attr); } if (inat_must_vex(insn->attr)) insn->attr = 0; /* This instruction is bad */ @@ -235,7 +236,7 @@ err_out: void insn_get_modrm(struct insn *insn) { struct insn_field *modrm = &insn->modrm; - insn_byte_t pfx, mod; + insn_byte_t pfx_id, mod; if (modrm->got) return; if (!insn->opcode.got) @@ -246,8 +247,8 @@ void insn_get_modrm(struct insn *insn) modrm->value = mod; modrm->nbytes = 1; if (inat_is_group(insn->attr)) { - pfx = insn_last_prefix(insn); - insn->attr = inat_get_group_attribute(mod, pfx, + pfx_id = insn_last_prefix_id(insn); + insn->attr = inat_get_group_attribute(mod, pfx_id, insn->attr); if (insn_is_avx(insn) && !inat_accept_vex(insn->attr)) insn->attr = 0; /* This is bad */ |