1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2012 Regents of the University of California 4 */ 5 6 #ifndef _ASM_RISCV_PROCESSOR_H 7 #define _ASM_RISCV_PROCESSOR_H 8 9 #include <linux/const.h> 10 #include <linux/cache.h> 11 #include <linux/prctl.h> 12 13 #include <vdso/processor.h> 14 15 #include <asm/ptrace.h> 16 17 #define arch_get_mmap_end(addr, len, flags) \ 18 ({ \ 19 unsigned long mmap_end; \ 20 typeof(addr) _addr = (addr); \ 21 if ((_addr) == 0 || \ 22 (IS_ENABLED(CONFIG_COMPAT) && is_compat_task()) || \ 23 ((_addr + len) > BIT(VA_BITS - 1))) \ 24 mmap_end = STACK_TOP_MAX; \ 25 else \ 26 mmap_end = (_addr + len); \ 27 mmap_end; \ 28 }) 29 30 #define arch_get_mmap_base(addr, base) \ 31 ({ \ 32 unsigned long mmap_base; \ 33 typeof(addr) _addr = (addr); \ 34 typeof(base) _base = (base); \ 35 unsigned long rnd_gap = DEFAULT_MAP_WINDOW - (_base); \ 36 if ((_addr) == 0 || \ 37 (IS_ENABLED(CONFIG_COMPAT) && is_compat_task()) || \ 38 ((_addr + len) > BIT(VA_BITS - 1))) \ 39 mmap_base = (_base); \ 40 else \ 41 mmap_base = (_addr + len) - rnd_gap; \ 42 mmap_base; \ 43 }) 44 45 #ifdef CONFIG_64BIT 46 #define DEFAULT_MAP_WINDOW (UL(1) << (MMAP_VA_BITS - 1)) 47 #define STACK_TOP_MAX TASK_SIZE_64 48 #else 49 #define DEFAULT_MAP_WINDOW TASK_SIZE 50 #define STACK_TOP_MAX TASK_SIZE 51 #endif 52 #define STACK_ALIGN 16 53 54 #define STACK_TOP DEFAULT_MAP_WINDOW 55 56 /* 57 * This decides where the kernel will search for a free chunk of vm 58 * space during mmap's. 59 */ 60 #ifdef CONFIG_64BIT 61 #define TASK_UNMAPPED_BASE PAGE_ALIGN((UL(1) << MMAP_MIN_VA_BITS) / 3) 62 #else 63 #define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3) 64 #endif 65 66 #ifndef __ASSEMBLY__ 67 68 struct task_struct; 69 struct pt_regs; 70 71 /* CPU-specific state of a task */ 72 struct thread_struct { 73 /* Callee-saved registers */ 74 unsigned long ra; 75 unsigned long sp; /* Kernel mode stack */ 76 unsigned long s[12]; /* s[0]: frame pointer */ 77 struct __riscv_d_ext_state fstate; 78 unsigned long bad_cause; 79 unsigned long vstate_ctrl; 80 struct __riscv_v_ext_state vstate; 81 unsigned long align_ctl; 82 }; 83 84 /* Whitelist the fstate from the task_struct for hardened usercopy */ 85 static inline void arch_thread_struct_whitelist(unsigned long *offset, 86 unsigned long *size) 87 { 88 *offset = offsetof(struct thread_struct, fstate); 89 *size = sizeof_field(struct thread_struct, fstate); 90 } 91 92 #define INIT_THREAD { \ 93 .sp = sizeof(init_stack) + (long)&init_stack, \ 94 .align_ctl = PR_UNALIGN_NOPRINT, \ 95 } 96 97 #define task_pt_regs(tsk) \ 98 ((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE \ 99 - ALIGN(sizeof(struct pt_regs), STACK_ALIGN))) 100 101 #define KSTK_EIP(tsk) (task_pt_regs(tsk)->epc) 102 #define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp) 103 104 105 /* Do necessary setup to start up a newly executed thread. */ 106 extern void start_thread(struct pt_regs *regs, 107 unsigned long pc, unsigned long sp); 108 109 extern unsigned long __get_wchan(struct task_struct *p); 110 111 112 static inline void wait_for_interrupt(void) 113 { 114 __asm__ __volatile__ ("wfi"); 115 } 116 117 extern phys_addr_t dma32_phys_limit; 118 119 struct device_node; 120 int riscv_of_processor_hartid(struct device_node *node, unsigned long *hartid); 121 int riscv_early_of_processor_hartid(struct device_node *node, unsigned long *hartid); 122 int riscv_of_parent_hartid(struct device_node *node, unsigned long *hartid); 123 124 extern void riscv_fill_hwcap(void); 125 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src); 126 127 extern unsigned long signal_minsigstksz __ro_after_init; 128 129 #ifdef CONFIG_RISCV_ISA_V 130 /* Userspace interface for PR_RISCV_V_{SET,GET}_VS prctl()s: */ 131 #define RISCV_V_SET_CONTROL(arg) riscv_v_vstate_ctrl_set_current(arg) 132 #define RISCV_V_GET_CONTROL() riscv_v_vstate_ctrl_get_current() 133 extern long riscv_v_vstate_ctrl_set_current(unsigned long arg); 134 extern long riscv_v_vstate_ctrl_get_current(void); 135 #endif /* CONFIG_RISCV_ISA_V */ 136 137 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long addr); 138 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val); 139 140 #define GET_UNALIGN_CTL(tsk, addr) get_unalign_ctl((tsk), (addr)) 141 #define SET_UNALIGN_CTL(tsk, val) set_unalign_ctl((tsk), (val)) 142 143 #endif /* __ASSEMBLY__ */ 144 145 #endif /* _ASM_RISCV_PROCESSOR_H */ 146