module.c

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/* 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"

#ifdef CONFIG_SPARC64

#include <linux/jump_label.h>

static void *module_map(unsigned long size)
{
    if (PAGE_ALIGN(size) > MODULES_LEN)
        return NULL;
    return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
                GFP_KERNEL, PAGE_KERNEL, -1,
                __builtin_return_address(0));
}
#else
static void *module_map(unsigned long size)
{
    return vmalloc(size);
}
#endif /* CONFIG_SPARC64 */

void *module_alloc(unsigned long size)
{
    void *ret;

    /* We handle the zero case fine, unlike vmalloc */
    if (size == 0)
        return NULL;

    ret = module_map(size);
    if (ret)
        memset(ret, 0, size);

    return ret;
}

/* 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;
    char *strtab;
    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;
    strtab = (char *)sechdrs[sechdrs[symidx].sh_link].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:
            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: %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)
{
    /* make jump label nops */
    jump_label_apply_nops(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 */