// SPDX-License-Identifier: GPL-2.0
/* Kernel module help for sparc64.
 *
 * Copyright (C) 2001 Rusty Russell.
 * Copyright (C) 2002 David S. Miller.
 */

#include <linux/moduleloader.h>
#include <linux/kernel.h>
#include <linux/elf.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/gfp.h>
#include <linux/string.h>
#include <linux/ctype.h>
#include <linux/mm.h>

#include <asm/processor.h>
#include <asm/spitfire.h>
#include <asm/cacheflush.h>

#include "entry.h"

/* Make generic code ignore STT_REGISTER dummy undefined symbols.  */
int module_frob_arch_sections(Elf_Ehdr *hdr,
                              Elf_Shdr *sechdrs,
                              char *secstrings,
                              struct module *mod)
{
        unsigned int symidx;
        Elf_Sym *sym;
        int i;

        for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
                if (symidx == hdr->e_shnum-1) {
                        printk("%s: no symtab found.\n", mod->name);
                        return -ENOEXEC;
                }
        }
        sym = (Elf_Sym *)sechdrs[symidx].sh_addr;

        for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
                if (sym[i].st_shndx == SHN_UNDEF) {
                        if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER)
                                sym[i].st_shndx = SHN_ABS;
                }
        }
        return 0;
}

int apply_relocate_add(Elf_Shdr *sechdrs,
                       const char *strtab,
                       unsigned int symindex,
                       unsigned int relsec,
                       struct module *me)
{
        unsigned int i;
        Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
        Elf_Sym *sym;
        u8 *location;
        u32 *loc32;

        for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
                Elf_Addr v;

                /* This is where to make the change */
                location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
                        + rel[i].r_offset;
                loc32 = (u32 *) location;

#ifdef CONFIG_SPARC64
                BUG_ON(((u64)location >> (u64)32) != (u64)0);
#endif /* CONFIG_SPARC64 */

                /* This is the symbol it is referring to.  Note that all
                   undefined symbols have been resolved.  */
                sym = (Elf_Sym *)sechdrs[symindex].sh_addr
                        + ELF_R_SYM(rel[i].r_info);
                v = sym->st_value + rel[i].r_addend;

                switch (ELF_R_TYPE(rel[i].r_info) & 0xff) {
                case R_SPARC_DISP32:
                        v -= (Elf_Addr) location;
                        *loc32 = v;
                        break;
#ifdef CONFIG_SPARC64
                case R_SPARC_64:
                case R_SPARC_UA64:
                        location[0] = v >> 56;
                        location[1] = v >> 48;
                        location[2] = v >> 40;
                        location[3] = v >> 32;
                        location[4] = v >> 24;
                        location[5] = v >> 16;
                        location[6] = v >>  8;
                        location[7] = v >>  0;
                        break;

                case R_SPARC_WDISP19:
                        v -= (Elf_Addr) location;
                        *loc32 = (*loc32 & ~0x7ffff) |
                                ((v >> 2) & 0x7ffff);
                        break;

                case R_SPARC_OLO10:
                        *loc32 = (*loc32 & ~0x1fff) |
                                (((v & 0x3ff) +
                                  (ELF_R_TYPE(rel[i].r_info) >> 8))
                                 & 0x1fff);
                        break;
#endif /* CONFIG_SPARC64 */

                case R_SPARC_32:
                case R_SPARC_UA32:
                        location[0] = v >> 24;
                        location[1] = v >> 16;
                        location[2] = v >>  8;
                        location[3] = v >>  0;
                        break;

                case R_SPARC_WDISP30:
                        v -= (Elf_Addr) location;
                        *loc32 = (*loc32 & ~0x3fffffff) |
                                ((v >> 2) & 0x3fffffff);
                        break;

                case R_SPARC_WDISP22:
                        v -= (Elf_Addr) location;
                        *loc32 = (*loc32 & ~0x3fffff) |
                                ((v >> 2) & 0x3fffff);
                        break;

                case R_SPARC_LO10:
                        *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
                        break;

                case R_SPARC_HI22:
                        *loc32 = (*loc32 & ~0x3fffff) |
                                ((v >> 10) & 0x3fffff);
                        break;

                default:
                        printk(KERN_ERR "module %s: Unknown relocation: 0x%x\n",
                               me->name,
                               (int) (ELF_R_TYPE(rel[i].r_info) & 0xff));
                        return -ENOEXEC;
                }
        }
        return 0;
}

#ifdef CONFIG_SPARC64
static void do_patch_sections(const Elf_Ehdr *hdr,
                              const Elf_Shdr *sechdrs)
{
        const Elf_Shdr *s, *sun4v_1insn = NULL, *sun4v_2insn = NULL;
        char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;

        for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
                if (!strcmp(".sun4v_1insn_patch", secstrings + s->sh_name))
                        sun4v_1insn = s;
                if (!strcmp(".sun4v_2insn_patch", secstrings + s->sh_name))
                        sun4v_2insn = s;
        }

        if (sun4v_1insn && tlb_type == hypervisor) {
                void *p = (void *) sun4v_1insn->sh_addr;
                sun4v_patch_1insn_range(p, p + sun4v_1insn->sh_size);
        }
        if (sun4v_2insn && tlb_type == hypervisor) {
                void *p = (void *) sun4v_2insn->sh_addr;
                sun4v_patch_2insn_range(p, p + sun4v_2insn->sh_size);
        }
}

int module_finalize(const Elf_Ehdr *hdr,
                    const Elf_Shdr *sechdrs,
                    struct module *me)
{
        do_patch_sections(hdr, sechdrs);

        /* Cheetah's I-cache is fully coherent.  */
        if (tlb_type == spitfire) {
                unsigned long va;

                flushw_all();
                for (va =  0; va < (PAGE_SIZE << 1); va += 32)
                        spitfire_put_icache_tag(va, 0x0);
                __asm__ __volatile__("flush %g6");
        }

        return 0;
}
#endif /* CONFIG_SPARC64 */