arch/riscv/include/asm/processor.h

   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 #ifdef CONFIG_64BIT
  18 #define DEFAULT_MAP_WINDOW      (UL(1) << (MMAP_VA_BITS - 1))
  19 #define STACK_TOP_MAX           TASK_SIZE_64
  20
  21 #define arch_get_mmap_end(addr, len, flags)                     \
  22 ({                                                              \
  23         unsigned long mmap_end;                                 \
  24         typeof(addr) _addr = (addr);                            \
  25         if ((_addr) == 0 || (IS_ENABLED(CONFIG_COMPAT) && is_compat_task())) \
  26                 mmap_end = STACK_TOP_MAX;                       \
  27         else if ((_addr) >= VA_USER_SV57)                       \
  28                 mmap_end = STACK_TOP_MAX;                       \
  29         else if ((((_addr) >= VA_USER_SV48)) && (VA_BITS >= VA_BITS_SV48)) \
  30                 mmap_end = VA_USER_SV48;                        \
  31         else                                                    \
  32                 mmap_end = VA_USER_SV39;                        \
  33         mmap_end;                                               \
  34 })
  35
  36 #define arch_get_mmap_base(addr, base)                          \
  37 ({                                                              \
  38         unsigned long mmap_base;                                \
  39         typeof(addr) _addr = (addr);                            \
  40         typeof(base) _base = (base);                            \
  41         unsigned long rnd_gap = DEFAULT_MAP_WINDOW - (_base);   \
  42         if ((_addr) == 0 || (IS_ENABLED(CONFIG_COMPAT) && is_compat_task())) \
  43                 mmap_base = (_base);                            \
  44         else if (((_addr) >= VA_USER_SV57) && (VA_BITS >= VA_BITS_SV57)) \
  45                 mmap_base = VA_USER_SV57 - rnd_gap;             \
  46         else if ((((_addr) >= VA_USER_SV48)) && (VA_BITS >= VA_BITS_SV48)) \
  47                 mmap_base = VA_USER_SV48 - rnd_gap;             \
  48         else                                                    \
  49                 mmap_base = VA_USER_SV39 - rnd_gap;             \
  50         mmap_base;                                              \
  51 })
  52
  53 #else
  54 #define DEFAULT_MAP_WINDOW      TASK_SIZE
  55 #define STACK_TOP_MAX           TASK_SIZE
  56 #endif
  57 #define STACK_ALIGN             16
  58
  59 #define STACK_TOP               DEFAULT_MAP_WINDOW
  60
  61 /*
  62  * This decides where the kernel will search for a free chunk of vm
  63  * space during mmap's.
  64  */
  65 #ifdef CONFIG_64BIT
  66 #define TASK_UNMAPPED_BASE      PAGE_ALIGN((UL(1) << MMAP_MIN_VA_BITS) / 3)
  67 #else
  68 #define TASK_UNMAPPED_BASE      PAGE_ALIGN(TASK_SIZE / 3)
  69 #endif
  70
  71 #ifndef __ASSEMBLY__
  72
  73 struct task_struct;
  74 struct pt_regs;
  75
  76 /* CPU-specific state of a task */
  77 struct thread_struct {
  78         /* Callee-saved registers */
  79         unsigned long ra;
  80         unsigned long sp;       /* Kernel mode stack */
  81         unsigned long s[12];    /* s[0]: frame pointer */
  82         struct __riscv_d_ext_state fstate;
  83         unsigned long bad_cause;
  84         unsigned long vstate_ctrl;
  85         struct __riscv_v_ext_state vstate;
  86         unsigned long align_ctl;
  87 };
  88
  89 /* Whitelist the fstate from the task_struct for hardened usercopy */
  90 static inline void arch_thread_struct_whitelist(unsigned long *offset,
  91                                                 unsigned long *size)
  92 {
  93         *offset = offsetof(struct thread_struct, fstate);
  94         *size = sizeof_field(struct thread_struct, fstate);
  95 }
  96
  97 #define INIT_THREAD {                                   \
  98         .sp = sizeof(init_stack) + (long)&init_stack,   \
  99         .align_ctl = PR_UNALIGN_NOPRINT,                \
 100 }
 101
 102 #define task_pt_regs(tsk)                                               \
 103         ((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE          \
 104                             - ALIGN(sizeof(struct pt_regs), STACK_ALIGN)))
 105
 106 #define KSTK_EIP(tsk)           (task_pt_regs(tsk)->epc)
 107 #define KSTK_ESP(tsk)           (task_pt_regs(tsk)->sp)
 108
 109
 110 /* Do necessary setup to start up a newly executed thread. */
 111 extern void start_thread(struct pt_regs *regs,
 112                         unsigned long pc, unsigned long sp);
 113
 114 extern unsigned long __get_wchan(struct task_struct *p);
 115
 116
 117 static inline void wait_for_interrupt(void)
 118 {
 119         __asm__ __volatile__ ("wfi");
 120 }
 121
 122 extern phys_addr_t dma32_phys_limit;
 123
 124 struct device_node;
 125 int riscv_of_processor_hartid(struct device_node *node, unsigned long *hartid);
 126 int riscv_early_of_processor_hartid(struct device_node *node, unsigned long *hartid);
 127 int riscv_of_parent_hartid(struct device_node *node, unsigned long *hartid);
 128
 129 extern void riscv_fill_hwcap(void);
 130 extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
 131
 132 extern unsigned long signal_minsigstksz __ro_after_init;
 133
 134 #ifdef CONFIG_RISCV_ISA_V
 135 /* Userspace interface for PR_RISCV_V_{SET,GET}_VS prctl()s: */
 136 #define RISCV_V_SET_CONTROL(arg)        riscv_v_vstate_ctrl_set_current(arg)
 137 #define RISCV_V_GET_CONTROL()           riscv_v_vstate_ctrl_get_current()
 138 extern long riscv_v_vstate_ctrl_set_current(unsigned long arg);
 139 extern long riscv_v_vstate_ctrl_get_current(void);
 140 #endif /* CONFIG_RISCV_ISA_V */
 141
 142 extern int get_unalign_ctl(struct task_struct *tsk, unsigned long addr);
 143 extern int set_unalign_ctl(struct task_struct *tsk, unsigned int val);
 144
 145 #define GET_UNALIGN_CTL(tsk, addr)      get_unalign_ctl((tsk), (addr))
 146 #define SET_UNALIGN_CTL(tsk, val)       set_unalign_ctl((tsk), (val))
 147
 148 #endif /* __ASSEMBLY__ */
 149
 150 #endif /* _ASM_RISCV_PROCESSOR_H */