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/* SPDX-License-Identifier: GPL-2.0-only */
* Copyright (C) 2012 Regents of the University of California
#include <linux/const.h>
#include <vdso/processor.h>
#include <asm/ptrace.h>
* This decides where the kernel will search for a free chunk of vm
* space during mmap's.
#define STACK_ALIGN 16
#ifndef __ASSEMBLY__
struct task_struct;
struct pt_regs;
/* CPU-specific state of a task */
struct thread_struct {
/* Callee-saved registers */
unsigned long ra;
unsigned long sp; /* Kernel mode stack */
unsigned long s[12]; /* s[0]: frame pointer */
struct __riscv_d_ext_state fstate;
unsigned long bad_cause;
/* Whitelist the fstate from the task_struct for hardened usercopy */
static inline void arch_thread_struct_whitelist(unsigned long *offset,
unsigned long *size)
*offset = offsetof(struct thread_struct, fstate);
*size = sizeof_field(struct thread_struct, fstate);
#define INIT_THREAD { \
.sp = sizeof(init_stack) + (long)&init_stack, \
#define task_pt_regs(tsk) \
((struct pt_regs *)(task_stack_page(tsk) + THREAD_SIZE \
- ALIGN(sizeof(struct pt_regs), STACK_ALIGN)))
#define KSTK_EIP(tsk) (task_pt_regs(tsk)->epc)
#define KSTK_ESP(tsk) (task_pt_regs(tsk)->sp)
/* Do necessary setup to start up a newly executed thread. */
extern void start_thread(struct pt_regs *regs,
unsigned long pc, unsigned long sp);
/* Free all resources held by a thread. */
static inline void release_thread(struct task_struct *dead_task)
extern unsigned long get_wchan(struct task_struct *p);
static inline void wait_for_interrupt(void)
__asm__ __volatile__ ("wfi");
struct device_node;
int riscv_of_processor_hartid(struct device_node *node);
int riscv_of_parent_hartid(struct device_node *node);
extern void riscv_fill_hwcap(void);
extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
#endif /* __ASSEMBLY__ */