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330 lines
9.0 KiB
330 lines
9.0 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Based on arch/arm/include/asm/processor.h |
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* |
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* Copyright (C) 1995-1999 Russell King |
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* Copyright (C) 2012 ARM Ltd. |
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*/ |
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#ifndef __ASM_PROCESSOR_H |
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#define __ASM_PROCESSOR_H |
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/* |
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* On arm64 systems, unaligned accesses by the CPU are cheap, and so there is |
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* no point in shifting all network buffers by 2 bytes just to make some IP |
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* header fields appear aligned in memory, potentially sacrificing some DMA |
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* performance on some platforms. |
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*/ |
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#define NET_IP_ALIGN 0 |
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#ifndef __ASSEMBLY__ |
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#include <linux/build_bug.h> |
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#include <linux/cache.h> |
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#include <linux/init.h> |
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#include <linux/stddef.h> |
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#include <linux/string.h> |
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#include <linux/thread_info.h> |
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#include <vdso/processor.h> |
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#include <asm/alternative.h> |
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#include <asm/cpufeature.h> |
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#include <asm/hw_breakpoint.h> |
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#include <asm/kasan.h> |
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#include <asm/lse.h> |
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#include <asm/pgtable-hwdef.h> |
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#include <asm/pointer_auth.h> |
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#include <asm/ptrace.h> |
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#include <asm/spectre.h> |
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#include <asm/types.h> |
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/* |
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* TASK_SIZE - the maximum size of a user space task. |
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* TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area. |
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*/ |
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#define DEFAULT_MAP_WINDOW_64 (UL(1) << VA_BITS_MIN) |
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#define TASK_SIZE_64 (UL(1) << vabits_actual) |
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#define TASK_SIZE_MAX (UL(1) << VA_BITS) |
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#ifdef CONFIG_COMPAT |
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#if defined(CONFIG_ARM64_64K_PAGES) && defined(CONFIG_KUSER_HELPERS) |
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/* |
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* With CONFIG_ARM64_64K_PAGES enabled, the last page is occupied |
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* by the compat vectors page. |
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*/ |
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#define TASK_SIZE_32 UL(0x100000000) |
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#else |
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#define TASK_SIZE_32 (UL(0x100000000) - PAGE_SIZE) |
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#endif /* CONFIG_ARM64_64K_PAGES */ |
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#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \ |
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TASK_SIZE_32 : TASK_SIZE_64) |
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#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \ |
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TASK_SIZE_32 : TASK_SIZE_64) |
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#define DEFAULT_MAP_WINDOW (test_thread_flag(TIF_32BIT) ? \ |
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TASK_SIZE_32 : DEFAULT_MAP_WINDOW_64) |
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#else |
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#define TASK_SIZE TASK_SIZE_64 |
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#define DEFAULT_MAP_WINDOW DEFAULT_MAP_WINDOW_64 |
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#endif /* CONFIG_COMPAT */ |
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#ifdef CONFIG_ARM64_FORCE_52BIT |
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#define STACK_TOP_MAX TASK_SIZE_64 |
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#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4)) |
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#else |
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#define STACK_TOP_MAX DEFAULT_MAP_WINDOW_64 |
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#define TASK_UNMAPPED_BASE (PAGE_ALIGN(DEFAULT_MAP_WINDOW / 4)) |
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#endif /* CONFIG_ARM64_FORCE_52BIT */ |
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#ifdef CONFIG_COMPAT |
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#define AARCH32_VECTORS_BASE 0xffff0000 |
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#define STACK_TOP (test_thread_flag(TIF_32BIT) ? \ |
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AARCH32_VECTORS_BASE : STACK_TOP_MAX) |
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#else |
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#define STACK_TOP STACK_TOP_MAX |
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#endif /* CONFIG_COMPAT */ |
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#ifndef CONFIG_ARM64_FORCE_52BIT |
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#define arch_get_mmap_end(addr) ((addr > DEFAULT_MAP_WINDOW) ? TASK_SIZE :\ |
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DEFAULT_MAP_WINDOW) |
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#define arch_get_mmap_base(addr, base) ((addr > DEFAULT_MAP_WINDOW) ? \ |
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base + TASK_SIZE - DEFAULT_MAP_WINDOW :\ |
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base) |
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#endif /* CONFIG_ARM64_FORCE_52BIT */ |
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extern phys_addr_t arm64_dma_phys_limit; |
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#define ARCH_LOW_ADDRESS_LIMIT (arm64_dma_phys_limit - 1) |
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struct debug_info { |
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#ifdef CONFIG_HAVE_HW_BREAKPOINT |
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/* Have we suspended stepping by a debugger? */ |
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int suspended_step; |
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/* Allow breakpoints and watchpoints to be disabled for this thread. */ |
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int bps_disabled; |
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int wps_disabled; |
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/* Hardware breakpoints pinned to this task. */ |
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struct perf_event *hbp_break[ARM_MAX_BRP]; |
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struct perf_event *hbp_watch[ARM_MAX_WRP]; |
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#endif |
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}; |
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struct cpu_context { |
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unsigned long x19; |
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unsigned long x20; |
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unsigned long x21; |
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unsigned long x22; |
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unsigned long x23; |
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unsigned long x24; |
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unsigned long x25; |
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unsigned long x26; |
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unsigned long x27; |
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unsigned long x28; |
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unsigned long fp; |
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unsigned long sp; |
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unsigned long pc; |
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}; |
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struct thread_struct { |
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struct cpu_context cpu_context; /* cpu context */ |
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/* |
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* Whitelisted fields for hardened usercopy: |
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* Maintainers must ensure manually that this contains no |
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* implicit padding. |
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*/ |
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struct { |
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unsigned long tp_value; /* TLS register */ |
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unsigned long tp2_value; |
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struct user_fpsimd_state fpsimd_state; |
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} uw; |
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unsigned int fpsimd_cpu; |
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void *sve_state; /* SVE registers, if any */ |
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unsigned int sve_vl; /* SVE vector length */ |
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unsigned int sve_vl_onexec; /* SVE vl after next exec */ |
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unsigned long fault_address; /* fault info */ |
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unsigned long fault_code; /* ESR_EL1 value */ |
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struct debug_info debug; /* debugging */ |
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#ifdef CONFIG_ARM64_PTR_AUTH |
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struct ptrauth_keys_user keys_user; |
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struct ptrauth_keys_kernel keys_kernel; |
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#endif |
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#ifdef CONFIG_ARM64_MTE |
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u64 sctlr_tcf0; |
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u64 gcr_user_excl; |
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#endif |
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}; |
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static inline void arch_thread_struct_whitelist(unsigned long *offset, |
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unsigned long *size) |
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{ |
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/* Verify that there is no padding among the whitelisted fields: */ |
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BUILD_BUG_ON(sizeof_field(struct thread_struct, uw) != |
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sizeof_field(struct thread_struct, uw.tp_value) + |
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sizeof_field(struct thread_struct, uw.tp2_value) + |
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sizeof_field(struct thread_struct, uw.fpsimd_state)); |
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*offset = offsetof(struct thread_struct, uw); |
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*size = sizeof_field(struct thread_struct, uw); |
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} |
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#ifdef CONFIG_COMPAT |
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#define task_user_tls(t) \ |
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({ \ |
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unsigned long *__tls; \ |
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if (is_compat_thread(task_thread_info(t))) \ |
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__tls = &(t)->thread.uw.tp2_value; \ |
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else \ |
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__tls = &(t)->thread.uw.tp_value; \ |
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__tls; \ |
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}) |
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#else |
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#define task_user_tls(t) (&(t)->thread.uw.tp_value) |
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#endif |
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/* Sync TPIDR_EL0 back to thread_struct for current */ |
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void tls_preserve_current_state(void); |
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#define INIT_THREAD { \ |
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.fpsimd_cpu = NR_CPUS, \ |
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} |
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static inline void start_thread_common(struct pt_regs *regs, unsigned long pc) |
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{ |
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memset(regs, 0, sizeof(*regs)); |
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forget_syscall(regs); |
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regs->pc = pc; |
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if (system_uses_irq_prio_masking()) |
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regs->pmr_save = GIC_PRIO_IRQON; |
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} |
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static inline void start_thread(struct pt_regs *regs, unsigned long pc, |
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unsigned long sp) |
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{ |
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start_thread_common(regs, pc); |
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regs->pstate = PSR_MODE_EL0t; |
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spectre_v4_enable_task_mitigation(current); |
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regs->sp = sp; |
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} |
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#ifdef CONFIG_COMPAT |
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static inline void compat_start_thread(struct pt_regs *regs, unsigned long pc, |
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unsigned long sp) |
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{ |
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start_thread_common(regs, pc); |
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regs->pstate = PSR_AA32_MODE_USR; |
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if (pc & 1) |
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regs->pstate |= PSR_AA32_T_BIT; |
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#ifdef __AARCH64EB__ |
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regs->pstate |= PSR_AA32_E_BIT; |
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#endif |
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spectre_v4_enable_task_mitigation(current); |
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regs->compat_sp = sp; |
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} |
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#endif |
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static inline bool is_ttbr0_addr(unsigned long addr) |
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{ |
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/* entry assembly clears tags for TTBR0 addrs */ |
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return addr < TASK_SIZE; |
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} |
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static inline bool is_ttbr1_addr(unsigned long addr) |
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{ |
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/* TTBR1 addresses may have a tag if KASAN_SW_TAGS is in use */ |
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return arch_kasan_reset_tag(addr) >= PAGE_OFFSET; |
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} |
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/* Forward declaration, a strange C thing */ |
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struct task_struct; |
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/* Free all resources held by a thread. */ |
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extern void release_thread(struct task_struct *); |
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unsigned long get_wchan(struct task_struct *p); |
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/* Thread switching */ |
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extern struct task_struct *cpu_switch_to(struct task_struct *prev, |
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struct task_struct *next); |
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asmlinkage void arm64_preempt_schedule_irq(void); |
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#define task_pt_regs(p) \ |
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((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1) |
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#define KSTK_EIP(tsk) ((unsigned long)task_pt_regs(tsk)->pc) |
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#define KSTK_ESP(tsk) user_stack_pointer(task_pt_regs(tsk)) |
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/* |
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* Prefetching support |
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*/ |
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#define ARCH_HAS_PREFETCH |
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static inline void prefetch(const void *ptr) |
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{ |
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asm volatile("prfm pldl1keep, %a0\n" : : "p" (ptr)); |
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} |
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#define ARCH_HAS_PREFETCHW |
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static inline void prefetchw(const void *ptr) |
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{ |
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asm volatile("prfm pstl1keep, %a0\n" : : "p" (ptr)); |
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} |
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#define ARCH_HAS_SPINLOCK_PREFETCH |
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static inline void spin_lock_prefetch(const void *ptr) |
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{ |
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asm volatile(ARM64_LSE_ATOMIC_INSN( |
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"prfm pstl1strm, %a0", |
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"nop") : : "p" (ptr)); |
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} |
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extern unsigned long __ro_after_init signal_minsigstksz; /* sigframe size */ |
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extern void __init minsigstksz_setup(void); |
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/* |
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* Not at the top of the file due to a direct #include cycle between |
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* <asm/fpsimd.h> and <asm/processor.h>. Deferring this #include |
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* ensures that contents of processor.h are visible to fpsimd.h even if |
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* processor.h is included first. |
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* |
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* These prctl helpers are the only things in this file that require |
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* fpsimd.h. The core code expects them to be in this header. |
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*/ |
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#include <asm/fpsimd.h> |
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/* Userspace interface for PR_SVE_{SET,GET}_VL prctl()s: */ |
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#define SVE_SET_VL(arg) sve_set_current_vl(arg) |
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#define SVE_GET_VL() sve_get_current_vl() |
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/* PR_PAC_RESET_KEYS prctl */ |
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#define PAC_RESET_KEYS(tsk, arg) ptrauth_prctl_reset_keys(tsk, arg) |
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#ifdef CONFIG_ARM64_TAGGED_ADDR_ABI |
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/* PR_{SET,GET}_TAGGED_ADDR_CTRL prctl */ |
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long set_tagged_addr_ctrl(struct task_struct *task, unsigned long arg); |
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long get_tagged_addr_ctrl(struct task_struct *task); |
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#define SET_TAGGED_ADDR_CTRL(arg) set_tagged_addr_ctrl(current, arg) |
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#define GET_TAGGED_ADDR_CTRL() get_tagged_addr_ctrl(current) |
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#endif |
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/* |
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* For CONFIG_GCC_PLUGIN_STACKLEAK |
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* |
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* These need to be macros because otherwise we get stuck in a nightmare |
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* of header definitions for the use of task_stack_page. |
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*/ |
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#define current_top_of_stack() \ |
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({ \ |
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struct stack_info _info; \ |
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BUG_ON(!on_accessible_stack(current, current_stack_pointer, &_info)); \ |
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_info.high; \ |
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}) |
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#define on_thread_stack() (on_task_stack(current, current_stack_pointer, NULL)) |
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#endif /* __ASSEMBLY__ */ |
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#endif /* __ASM_PROCESSOR_H */
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