Commit 2129a235 authored by Palmer Dabbelt's avatar Palmer Dabbelt

RISC-V: ELF and module implementation

This patch contains the code that interfaces with ELF objects on RISC-V
systems, the vast majority of which is present to load kernel modules.
Signed-off-by: default avatarPalmer Dabbelt <palmer@dabbelt.com>
parent 5d8544e2
/*
* Copyright (C) 2012 ARM Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ASM_COMPAT_H
#define __ASM_COMPAT_H
#ifdef CONFIG_COMPAT
#if defined(CONFIG_64BIT)
#define COMPAT_UTS_MACHINE "riscv64\0\0"
#elif defined(CONFIG_32BIT)
#define COMPAT_UTS_MACHINE "riscv32\0\0"
#else
#error "Unknown RISC-V base ISA"
#endif
#endif /*CONFIG_COMPAT*/
#endif /*__ASM_COMPAT_H*/
/*
* Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
* Copyright (C) 2012 Regents of the University of California
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#ifndef _ASM_RISCV_ELF_H
#define _ASM_RISCV_ELF_H
#include <uapi/asm/elf.h>
#include <asm/auxvec.h>
#include <asm/byteorder.h>
/* TODO: Move definition into include/uapi/linux/elf-em.h */
#define EM_RISCV 0xF3
/*
* These are used to set parameters in the core dumps.
*/
#define ELF_ARCH EM_RISCV
#ifdef CONFIG_64BIT
#define ELF_CLASS ELFCLASS64
#else
#define ELF_CLASS ELFCLASS32
#endif
#if defined(__LITTLE_ENDIAN)
#define ELF_DATA ELFDATA2LSB
#elif defined(__BIG_ENDIAN)
#define ELF_DATA ELFDATA2MSB
#else
#error "Unknown endianness"
#endif
/*
* This is used to ensure we don't load something for the wrong architecture.
*/
#define elf_check_arch(x) ((x)->e_machine == EM_RISCV)
#define CORE_DUMP_USE_REGSET
#define ELF_EXEC_PAGESIZE (PAGE_SIZE)
/*
* This is the location that an ET_DYN program is loaded if exec'ed. Typical
* use of this is to invoke "./ld.so someprog" to test out a new version of
* the loader. We need to make sure that it is out of the way of the program
* that it will "exec", and that there is sufficient room for the brk.
*/
#define ELF_ET_DYN_BASE ((TASK_SIZE / 3) * 2)
/*
* This yields a mask that user programs can use to figure out what
* instruction set this CPU supports. This could be done in user space,
* but it's not easy, and we've already done it here.
*/
#define ELF_HWCAP (elf_hwcap)
extern unsigned long elf_hwcap;
/*
* This yields a string that ld.so will use to load implementation
* specific libraries for optimization. This is more specific in
* intent than poking at uname or /proc/cpuinfo.
*/
#define ELF_PLATFORM (NULL)
#define ARCH_DLINFO \
do { \
NEW_AUX_ENT(AT_SYSINFO_EHDR, \
(elf_addr_t)current->mm->context.vdso); \
} while (0)
#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
struct linux_binprm;
extern int arch_setup_additional_pages(struct linux_binprm *bprm,
int uses_interp);
#endif /* _ASM_RISCV_ELF_H */
/*
* Copied from arch/arm64/include/asm/hwcap.h
*
* Copyright (C) 2012 ARM Ltd.
* Copyright (C) 2017 SiFive
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __ASM_HWCAP_H
#define __ASM_HWCAP_H
#include <uapi/asm/hwcap.h>
#ifndef __ASSEMBLY__
/*
* This yields a mask that user programs can use to figure out what
* instruction set this cpu supports.
*/
#define ELF_HWCAP (elf_hwcap)
enum {
CAP_HWCAP = 1,
};
extern unsigned long elf_hwcap;
#endif
#endif
/*
* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
* Lennox Wu <lennox.wu@sunplusct.com>
* Chen Liqin <liqin.chen@sunplusct.com>
* Copyright (C) 2013 Regents of the University of California
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see the file COPYING, or write
* to the Free Software Foundation, Inc.,
*/
#include <linux/extable.h>
#include <linux/module.h>
#include <linux/uaccess.h>
int fixup_exception(struct pt_regs *regs)
{
const struct exception_table_entry *fixup;
fixup = search_exception_tables(regs->sepc);
if (fixup) {
regs->sepc = fixup->fixup;
return 1;
}
return 0;
}
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