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RISC-V: User-facing API
This patch contains code that is in some way visible to the user: including via system calls, the VDSO, module loading and signal handling. It also contains some generic code that is ABI visible. Signed-off-by: Palmer Dabbelt <[email protected]>
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‎arch/riscv/include/asm/mmu.h

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/*
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* Copyright (C) 2012 Regents of the University of California
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _ASM_RISCV_MMU_H
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#define _ASM_RISCV_MMU_H
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#ifndef __ASSEMBLY__
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typedef struct {
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void *vdso;
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} mm_context_t;
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_RISCV_MMU_H */

‎arch/riscv/include/asm/ptrace.h

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/*
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* Copyright (C) 2012 Regents of the University of California
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _ASM_RISCV_PTRACE_H
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#define _ASM_RISCV_PTRACE_H
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#include <uapi/asm/ptrace.h>
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#include <asm/csr.h>
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#ifndef __ASSEMBLY__
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struct pt_regs {
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unsigned long sepc;
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unsigned long ra;
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unsigned long sp;
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unsigned long gp;
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unsigned long tp;
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unsigned long t0;
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unsigned long t1;
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unsigned long t2;
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unsigned long s0;
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unsigned long s1;
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unsigned long a0;
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unsigned long a1;
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unsigned long a2;
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unsigned long a3;
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unsigned long a4;
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unsigned long a5;
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unsigned long a6;
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unsigned long a7;
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unsigned long s2;
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unsigned long s3;
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unsigned long s4;
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unsigned long s5;
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unsigned long s6;
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unsigned long s7;
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unsigned long s8;
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unsigned long s9;
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unsigned long s10;
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unsigned long s11;
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unsigned long t3;
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unsigned long t4;
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unsigned long t5;
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unsigned long t6;
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/* Supervisor CSRs */
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unsigned long sstatus;
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unsigned long sbadaddr;
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unsigned long scause;
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/* a0 value before the syscall */
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unsigned long orig_a0;
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};
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#ifdef CONFIG_64BIT
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#define REG_FMT "%016lx"
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#else
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#define REG_FMT "%08lx"
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#endif
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#define user_mode(regs) (((regs)->sstatus & SR_PS) == 0)
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/* Helpers for working with the instruction pointer */
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#define GET_IP(regs) ((regs)->sepc)
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#define SET_IP(regs, val) (GET_IP(regs) = (val))
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static inline unsigned long instruction_pointer(struct pt_regs *regs)
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{
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return GET_IP(regs);
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}
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static inline void instruction_pointer_set(struct pt_regs *regs,
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unsigned long val)
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{
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SET_IP(regs, val);
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}
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#define profile_pc(regs) instruction_pointer(regs)
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/* Helpers for working with the user stack pointer */
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#define GET_USP(regs) ((regs)->sp)
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#define SET_USP(regs, val) (GET_USP(regs) = (val))
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static inline unsigned long user_stack_pointer(struct pt_regs *regs)
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{
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return GET_USP(regs);
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}
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static inline void user_stack_pointer_set(struct pt_regs *regs,
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unsigned long val)
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{
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SET_USP(regs, val);
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}
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/* Helpers for working with the frame pointer */
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#define GET_FP(regs) ((regs)->s0)
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#define SET_FP(regs, val) (GET_FP(regs) = (val))
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static inline unsigned long frame_pointer(struct pt_regs *regs)
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{
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return GET_FP(regs);
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}
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static inline void frame_pointer_set(struct pt_regs *regs,
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unsigned long val)
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{
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SET_FP(regs, val);
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}
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_RISCV_PTRACE_H */

‎arch/riscv/include/asm/syscall.h

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/*
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* Copyright (C) 2008-2009 Red Hat, Inc. All rights reserved.
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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* Copyright 2015 Regents of the University of California, Berkeley
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* See asm-generic/syscall.h for descriptions of what we must do here.
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*/
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#ifndef _ASM_RISCV_SYSCALL_H
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#define _ASM_RISCV_SYSCALL_H
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#include <linux/sched.h>
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#include <linux/err.h>
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/* The array of function pointers for syscalls. */
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extern void *sys_call_table[];
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/*
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* Only the low 32 bits of orig_r0 are meaningful, so we return int.
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* This importantly ignores the high bits on 64-bit, so comparisons
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* sign-extend the low 32 bits.
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*/
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static inline int syscall_get_nr(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs->a7;
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}
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static inline void syscall_set_nr(struct task_struct *task,
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struct pt_regs *regs,
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int sysno)
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{
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regs->a7 = sysno;
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}
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static inline void syscall_rollback(struct task_struct *task,
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struct pt_regs *regs)
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{
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regs->a0 = regs->orig_a0;
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}
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static inline long syscall_get_error(struct task_struct *task,
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struct pt_regs *regs)
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{
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unsigned long error = regs->a0;
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return IS_ERR_VALUE(error) ? error : 0;
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}
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static inline long syscall_get_return_value(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs->a0;
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}
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static inline void syscall_set_return_value(struct task_struct *task,
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struct pt_regs *regs,
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int error, long val)
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{
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regs->a0 = (long) error ?: val;
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}
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static inline void syscall_get_arguments(struct task_struct *task,
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struct pt_regs *regs,
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unsigned int i, unsigned int n,
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unsigned long *args)
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{
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BUG_ON(i + n > 6);
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if (i == 0) {
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args[0] = regs->orig_a0;
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args++;
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i++;
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n--;
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}
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memcpy(args, &regs->a1 + i * sizeof(regs->a1), n * sizeof(args[0]));
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}
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static inline void syscall_set_arguments(struct task_struct *task,
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struct pt_regs *regs,
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unsigned int i, unsigned int n,
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const unsigned long *args)
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{
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BUG_ON(i + n > 6);
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if (i == 0) {
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regs->orig_a0 = args[0];
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args++;
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i++;
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n--;
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}
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memcpy(&regs->a1 + i * sizeof(regs->a1), args, n * sizeof(regs->a0));
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}
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#endif /* _ASM_RISCV_SYSCALL_H */

‎arch/riscv/include/asm/unistd.h

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/*
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* Copyright (C) 2012 Regents of the University of California
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#define __ARCH_HAVE_MMU
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#define __ARCH_WANT_SYS_CLONE
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#include <uapi/asm/unistd.h>

‎arch/riscv/include/asm/vdso.h

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/*
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* Copyright (C) 2012 ARM Limited
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* Copyright (C) 2014 Regents of the University of California
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* Copyright (C) 2017 SiFive
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _ASM_RISCV_VDSO_H
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#define _ASM_RISCV_VDSO_H
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#include <linux/types.h>
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struct vdso_data {
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};
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/*
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* The VDSO symbols are mapped into Linux so we can just use regular symbol
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* addressing to get their offsets in userspace. The symbols are mapped at an
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* offset of 0, but since the linker must support setting weak undefined
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* symbols to the absolute address 0 it also happens to support other low
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* addresses even when the code model suggests those low addresses would not
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* otherwise be availiable.
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*/
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#define VDSO_SYMBOL(base, name) \
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({ \
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extern const char __vdso_##name[]; \
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(void __user *)((unsigned long)(base) + __vdso_##name); \
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})
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#endif /* _ASM_RISCV_VDSO_H */

‎arch/riscv/include/uapi/asm/Kbuild

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# UAPI Header export list
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include include/uapi/asm-generic/Kbuild.asm
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generic-y += setup.h
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generic-y += unistd.h
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generic-y += errno.h
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generic-y += fcntl.h
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generic-y += ioctl.h
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generic-y += ioctls.h
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generic-y += ipcbuf.h
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generic-y += mman.h
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generic-y += msgbuf.h
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generic-y += param.h
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generic-y += poll.h
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generic-y += posix_types.h
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generic-y += resource.h
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generic-y += sembuf.h
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generic-y += shmbuf.h
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generic-y += signal.h
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generic-y += socket.h
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generic-y += sockios.h
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generic-y += stat.h
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generic-y += statfs.h
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generic-y += swab.h
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generic-y += termbits.h
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generic-y += termios.h
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generic-y += types.h

‎arch/riscv/include/uapi/asm/auxvec.h

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/*
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* Copyright (C) 2012 ARM Ltd.
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* Copyright (C) 2015 Regents of the University of California
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _UAPI_ASM_RISCV_AUXVEC_H
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#define _UAPI_ASM_RISCV_AUXVEC_H
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/* vDSO location */
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#define AT_SYSINFO_EHDR 33
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#endif /* _UAPI_ASM_RISCV_AUXVEC_H */

‎arch/riscv/include/uapi/asm/bitsperlong.h

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/*
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* Copyright (C) 2012 ARM Ltd.
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* Copyright (C) 2015 Regents of the University of California
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _UAPI_ASM_RISCV_BITSPERLONG_H
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#define _UAPI_ASM_RISCV_BITSPERLONG_H
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#define __BITS_PER_LONG (__SIZEOF_POINTER__ * 8)
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#include <asm-generic/bitsperlong.h>
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#endif /* _UAPI_ASM_RISCV_BITSPERLONG_H */

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