/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * 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
 */

#ifndef _ASM_RISCV_ELF_H
#define _ASM_RISCV_ELF_H

#include <uapi/linux/elf.h>
#include <linux/compat.h>
#include <uapi/asm/elf.h>
#include <asm/auxvec.h>
#include <asm/byteorder.h>
#include <asm/cacheinfo.h>
#include <asm/cpufeature.h>

/*
 * These are used to set parameters in the core dumps.
 */
#define ELF_ARCH        EM_RISCV

#ifndef ELF_CLASS
#ifdef CONFIG_64BIT
#define ELF_CLASS       ELFCLASS64
#else
#define ELF_CLASS       ELFCLASS32
#endif
#endif

#define ELF_DATA        ELFDATA2LSB

/*
 * This is used to ensure we don't load something for the wrong architecture.
 */
#define elf_check_arch(x) (((x)->e_machine == EM_RISCV) && \
                           ((x)->e_ident[EI_CLASS] == ELF_CLASS))

extern bool compat_elf_check_arch(Elf32_Ehdr *hdr);
#define compat_elf_check_arch   compat_elf_check_arch

#define CORE_DUMP_USE_REGSET
#define ELF_FDPIC_CORE_EFLAGS   0
#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         ((DEFAULT_MAP_WINDOW / 3) * 2)

#ifdef CONFIG_64BIT
#define STACK_RND_MASK          (is_compat_task() ? \
                                 0x7ff >> (PAGE_SHIFT - 12) : \
                                 0x3ffff >> (PAGE_SHIFT - 12))
#endif

/*
 * Provides information on the availiable set of ISA extensions to userspace,
 * via a bitmap that coorespends to each single-letter ISA extension.  This is
 * essentially defunct, but will remain for compatibility with userspace.
 */
#define ELF_HWCAP       riscv_get_elf_hwcap()
extern unsigned long elf_hwcap;

#define ELF_FDPIC_PLAT_INIT(_r, _exec_map_addr, _interp_map_addr, dynamic_addr) \
        do { \
                (_r)->a1 = _exec_map_addr; \
                (_r)->a2 = _interp_map_addr; \
                (_r)->a3 = dynamic_addr; \
        } while (0)

/*
 * 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 COMPAT_ELF_PLATFORM     (NULL)

#define ARCH_DLINFO                                             \
do {                                                            \
        /*                                                      \
         * Note that we add ulong after elf_addr_t because      \
         * casting current->mm->context.vdso triggers a cast    \
         * warning of cast from pointer to integer for          \
         * COMPAT ELFCLASS32.                                   \
         */                                                     \
        NEW_AUX_ENT(AT_SYSINFO_EHDR,                            \
                (elf_addr_t)(ulong)current->mm->context.vdso);  \
        NEW_AUX_ENT(AT_L1I_CACHESIZE,                           \
                get_cache_size(1, CACHE_TYPE_INST));            \
        NEW_AUX_ENT(AT_L1I_CACHEGEOMETRY,                       \
                get_cache_geometry(1, CACHE_TYPE_INST));        \
        NEW_AUX_ENT(AT_L1D_CACHESIZE,                           \
                get_cache_size(1, CACHE_TYPE_DATA));            \
        NEW_AUX_ENT(AT_L1D_CACHEGEOMETRY,                       \
                get_cache_geometry(1, CACHE_TYPE_DATA));        \
        NEW_AUX_ENT(AT_L2_CACHESIZE,                            \
                get_cache_size(2, CACHE_TYPE_UNIFIED));         \
        NEW_AUX_ENT(AT_L2_CACHEGEOMETRY,                        \
                get_cache_geometry(2, CACHE_TYPE_UNIFIED));     \
        NEW_AUX_ENT(AT_L3_CACHESIZE,                            \
                get_cache_size(3, CACHE_TYPE_UNIFIED));         \
        NEW_AUX_ENT(AT_L3_CACHEGEOMETRY,                        \
                get_cache_geometry(3, CACHE_TYPE_UNIFIED));     \
        /*                                                       \
         * Should always be nonzero unless there's a kernel bug. \
         * If we haven't determined a sensible value to give to  \
         * userspace, omit the entry:                            \
         */                                                      \
        if (likely(signal_minsigstksz))                          \
                NEW_AUX_ENT(AT_MINSIGSTKSZ, signal_minsigstksz); \
        else                                                     \
                NEW_AUX_ENT(AT_IGNORE, 0);                       \
} while (0)

#ifdef CONFIG_MMU
#define ARCH_HAS_SETUP_ADDITIONAL_PAGES
struct linux_binprm;
extern int arch_setup_additional_pages(struct linux_binprm *bprm,
        int uses_interp);
#endif /* CONFIG_MMU */

#define ELF_CORE_COPY_REGS(dest, regs)                  \
do {                                                    \
        *(struct user_regs_struct *)&(dest) =           \
                *(struct user_regs_struct *)regs;       \
} while (0);

#ifdef CONFIG_COMPAT

#define SET_PERSONALITY(ex)                                     \
do {    set_compat_task((ex).e_ident[EI_CLASS] == ELFCLASS32);  \
        if (personality(current->personality) != PER_LINUX32)   \
                set_personality(PER_LINUX |                     \
                        (current->personality & (~PER_MASK)));  \
} while (0)

#define COMPAT_ELF_ET_DYN_BASE          ((TASK_SIZE_32 / 3) * 2)

/* rv32 registers */
typedef compat_ulong_t                  compat_elf_greg_t;
typedef compat_elf_greg_t               compat_elf_gregset_t[ELF_NGREG];

extern int compat_arch_setup_additional_pages(struct linux_binprm *bprm,
                                              int uses_interp);
#define compat_arch_setup_additional_pages \
                                compat_arch_setup_additional_pages

#endif /* CONFIG_COMPAT */
#endif /* _ASM_RISCV_ELF_H */