/* SPDX-License-Identifier: GPL-2.0-only */ /* * Based on arch/arm/include/asm/processor.h * * Copyright (C) 1995-1999 Russell King * Copyright (C) 2012 ARM Ltd. */ #ifndef __ASM_PROCESSOR_H #define __ASM_PROCESSOR_H #define KERNEL_DS UL(-1) #define USER_DS ((UL(1) << VA_BITS) - 1) /* * On arm64 systems, unaligned accesses by the CPU are cheap, and so there is * no point in shifting all network buffers by 2 bytes just to make some IP * header fields appear aligned in memory, potentially sacrificing some DMA * performance on some platforms. */ #define NET_IP_ALIGN 0 #ifndef __ASSEMBLY__ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * TASK_SIZE - the maximum size of a user space task. * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area. */ #define DEFAULT_MAP_WINDOW_64 (UL(1) << VA_BITS_MIN) #define TASK_SIZE_64 (UL(1) << vabits_actual) #ifdef CONFIG_COMPAT #if defined(CONFIG_ARM64_64K_PAGES) && defined(CONFIG_KUSER_HELPERS) /* * With CONFIG_ARM64_64K_PAGES enabled, the last page is occupied * by the compat vectors page. */ #define TASK_SIZE_32 UL(0x100000000) #else #define TASK_SIZE_32 (UL(0x100000000) - PAGE_SIZE) #endif /* CONFIG_ARM64_64K_PAGES */ #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \ TASK_SIZE_32 : TASK_SIZE_64) #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \ TASK_SIZE_32 : TASK_SIZE_64) #define DEFAULT_MAP_WINDOW (test_thread_flag(TIF_32BIT) ? \ TASK_SIZE_32 : DEFAULT_MAP_WINDOW_64) #else #define TASK_SIZE TASK_SIZE_64 #define DEFAULT_MAP_WINDOW DEFAULT_MAP_WINDOW_64 #endif /* CONFIG_COMPAT */ #ifdef CONFIG_ARM64_FORCE_52BIT #define STACK_TOP_MAX TASK_SIZE_64 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4)) #else #define STACK_TOP_MAX DEFAULT_MAP_WINDOW_64 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(DEFAULT_MAP_WINDOW / 4)) #endif /* CONFIG_ARM64_FORCE_52BIT */ #ifdef CONFIG_COMPAT #define AARCH32_VECTORS_BASE 0xffff0000 #define STACK_TOP (test_thread_flag(TIF_32BIT) ? \ AARCH32_VECTORS_BASE : STACK_TOP_MAX) #else #define STACK_TOP STACK_TOP_MAX #endif /* CONFIG_COMPAT */ #ifndef CONFIG_ARM64_FORCE_52BIT #define arch_get_mmap_end(addr) ((addr > DEFAULT_MAP_WINDOW) ? TASK_SIZE :\ DEFAULT_MAP_WINDOW) #define arch_get_mmap_base(addr, base) ((addr > DEFAULT_MAP_WINDOW) ? \ base + TASK_SIZE - DEFAULT_MAP_WINDOW :\ base) #endif /* CONFIG_ARM64_FORCE_52BIT */ extern phys_addr_t arm64_dma_phys_limit; #define ARCH_LOW_ADDRESS_LIMIT (arm64_dma_phys_limit - 1) struct debug_info { #ifdef CONFIG_HAVE_HW_BREAKPOINT /* Have we suspended stepping by a debugger? */ int suspended_step; /* Allow breakpoints and watchpoints to be disabled for this thread. */ int bps_disabled; int wps_disabled; /* Hardware breakpoints pinned to this task. */ struct perf_event *hbp_break[ARM_MAX_BRP]; struct perf_event *hbp_watch[ARM_MAX_WRP]; #endif }; struct cpu_context { unsigned long x19; unsigned long x20; unsigned long x21; unsigned long x22; unsigned long x23; unsigned long x24; unsigned long x25; unsigned long x26; unsigned long x27; unsigned long x28; unsigned long fp; unsigned long sp; unsigned long pc; }; struct thread_struct { struct cpu_context cpu_context; /* cpu context */ /* * Whitelisted fields for hardened usercopy: * Maintainers must ensure manually that this contains no * implicit padding. */ struct { unsigned long tp_value; /* TLS register */ unsigned long tp2_value; struct user_fpsimd_state fpsimd_state; } uw; unsigned int fpsimd_cpu; void *sve_state; /* SVE registers, if any */ unsigned int sve_vl; /* SVE vector length */ unsigned int sve_vl_onexec; /* SVE vl after next exec */ unsigned long fault_address; /* fault info */ unsigned long fault_code; /* ESR_EL1 value */ struct debug_info debug; /* debugging */ #ifdef CONFIG_ARM64_PTR_AUTH struct ptrauth_keys_user keys_user; struct ptrauth_keys_kernel keys_kernel; #endif #ifdef CONFIG_ARM64_MTE u64 sctlr_tcf0; u64 gcr_user_incl; #endif }; static inline void arch_thread_struct_whitelist(unsigned long *offset, unsigned long *size) { /* Verify that there is no padding among the whitelisted fields: */ BUILD_BUG_ON(sizeof_field(struct thread_struct, uw) != sizeof_field(struct thread_struct, uw.tp_value) + sizeof_field(struct thread_struct, uw.tp2_value) + sizeof_field(struct thread_struct, uw.fpsimd_state)); *offset = offsetof(struct thread_struct, uw); *size = sizeof_field(struct thread_struct, uw); } #ifdef CONFIG_COMPAT #define task_user_tls(t) \ ({ \ unsigned long *__tls; \ if (is_compat_thread(task_thread_info(t))) \ __tls = &(t)->thread.uw.tp2_value; \ else \ __tls = &(t)->thread.uw.tp_value; \ __tls; \ }) #else #define task_user_tls(t) (&(t)->thread.uw.tp_value) #endif /* Sync TPIDR_EL0 back to thread_struct for current */ void tls_preserve_current_state(void); #define INIT_THREAD { \ .fpsimd_cpu = NR_CPUS, \ } static inline void start_thread_common(struct pt_regs *regs, unsigned long pc) { memset(regs, 0, sizeof(*regs)); forget_syscall(regs); regs->pc = pc; if (system_uses_irq_prio_masking()) regs->pmr_save = GIC_PRIO_IRQON; } static inline void start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp) { start_thread_common(regs, pc); regs->pstate = PSR_MODE_EL0t; spectre_v4_enable_task_mitigation(current); regs->sp = sp; } #ifdef CONFIG_COMPAT static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc, unsigned long sp) { start_thread_common(regs, pc); regs->pstate = PSR_AA32_MODE_USR; if (pc & 1) regs->pstate |= PSR_AA32_T_BIT; #ifdef __AARCH64EB__ regs->pstate |= PSR_AA32_E_BIT; #endif spectre_v4_enable_task_mitigation(current); regs->compat_sp = sp; } #endif static inline bool is_ttbr0_addr(unsigned long addr) { /* entry assembly clears tags for TTBR0 addrs */ return addr < TASK_SIZE; } static inline bool is_ttbr1_addr(unsigned long addr) { /* TTBR1 addresses may have a tag if KASAN_SW_TAGS is in use */ return arch_kasan_reset_tag(addr) >= PAGE_OFFSET; } /* Forward declaration, a strange C thing */ struct task_struct; /* Free all resources held by a thread. */ extern void release_thread(struct task_struct *); unsigned long get_wchan(struct task_struct *p); /* Thread switching */ extern struct task_struct *cpu_switch_to(struct task_struct *prev, struct task_struct *next); #define task_pt_regs(p) \ ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1) #define KSTK_EIP(tsk) ((unsigned long)task_pt_regs(tsk)->pc) #define KSTK_ESP(tsk) user_stack_pointer(task_pt_regs(tsk)) /* * Prefetching support */ #define ARCH_HAS_PREFETCH static inline void prefetch(const void *ptr) { asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr)); } #define ARCH_HAS_PREFETCHW static inline void prefetchw(const void *ptr) { asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr)); } #define ARCH_HAS_SPINLOCK_PREFETCH static inline void spin_lock_prefetch(const void *ptr) { asm volatile(ARM64_LSE_ATOMIC_INSN( "prfm pstl1strm, %a0", "nop") : : "p" (ptr)); } extern unsigned long __ro_after_init signal_minsigstksz; /* sigframe size */ extern void __init minsigstksz_setup(void); /* * Not at the top of the file due to a direct #include cycle between * and . Deferring this #include * ensures that contents of processor.h are visible to fpsimd.h even if * processor.h is included first. * * These prctl helpers are the only things in this file that require * fpsimd.h. The core code expects them to be in this header. */ #include /* Userspace interface for PR_SVE_{SET,GET}_VL prctl()s: */ #define SVE_SET_VL(arg) sve_set_current_vl(arg) #define SVE_GET_VL() sve_get_current_vl() /* PR_PAC_RESET_KEYS prctl */ #define PAC_RESET_KEYS(tsk, arg) ptrauth_prctl_reset_keys(tsk, arg) #ifdef CONFIG_ARM64_TAGGED_ADDR_ABI /* PR_{SET,GET}_TAGGED_ADDR_CTRL prctl */ long set_tagged_addr_ctrl(struct task_struct *task, unsigned long arg); long get_tagged_addr_ctrl(struct task_struct *task); #define SET_TAGGED_ADDR_CTRL(arg) set_tagged_addr_ctrl(current, arg) #define GET_TAGGED_ADDR_CTRL() get_tagged_addr_ctrl(current) #endif /* * For CONFIG_GCC_PLUGIN_STACKLEAK * * These need to be macros because otherwise we get stuck in a nightmare * of header definitions for the use of task_stack_page. */ #define current_top_of_stack() \ ({ \ struct stack_info _info; \ BUG_ON(!on_accessible_stack(current, current_stack_pointer, &_info)); \ _info.high; \ }) #define on_thread_stack() (on_task_stack(current, current_stack_pointer, NULL)) #endif /* __ASSEMBLY__ */ #endif /* __ASM_PROCESSOR_H */