114 lines
3.0 KiB
C
114 lines
3.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/* Kernel module help for SH.
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SHcompact version by Kaz Kojima and Paul Mundt.
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SHmedia bits:
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Copyright 2004 SuperH (UK) Ltd
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Author: Richard Curnow
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Based on the sh version, and on code from the sh64-specific parts of
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modutils, originally written by Richard Curnow and Ben Gaster.
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*/
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#include <linux/moduleloader.h>
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#include <linux/elf.h>
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#include <linux/vmalloc.h>
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#include <linux/bug.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <asm/unaligned.h>
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#include <asm/dwarf.h>
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int apply_relocate_add(Elf32_Shdr *sechdrs,
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const char *strtab,
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unsigned int symindex,
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unsigned int relsec,
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struct module *me)
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{
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unsigned int i;
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Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
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Elf32_Sym *sym;
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Elf32_Addr relocation;
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uint32_t *location;
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uint32_t value;
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pr_debug("Applying relocate section %u to %u\n", relsec,
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sechdrs[relsec].sh_info);
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for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
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/* This is where to make the change */
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location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
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+ rel[i].r_offset;
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/* This is the symbol it is referring to. Note that all
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undefined symbols have been resolved. */
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sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
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+ ELF32_R_SYM(rel[i].r_info);
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relocation = sym->st_value + rel[i].r_addend;
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#ifdef CONFIG_SUPERH64
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/* For text addresses, bit2 of the st_other field indicates
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* whether the symbol is SHmedia (1) or SHcompact (0). If
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* SHmedia, the LSB of the symbol needs to be asserted
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* for the CPU to be in SHmedia mode when it starts executing
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* the branch target. */
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relocation |= !!(sym->st_other & 4);
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#endif
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switch (ELF32_R_TYPE(rel[i].r_info)) {
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case R_SH_NONE:
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break;
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case R_SH_DIR32:
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value = get_unaligned(location);
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value += relocation;
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put_unaligned(value, location);
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break;
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case R_SH_REL32:
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relocation = (relocation - (Elf32_Addr) location);
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value = get_unaligned(location);
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value += relocation;
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put_unaligned(value, location);
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break;
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case R_SH_IMM_LOW16:
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*location = (*location & ~0x3fffc00) |
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((relocation & 0xffff) << 10);
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break;
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case R_SH_IMM_MEDLOW16:
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*location = (*location & ~0x3fffc00) |
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(((relocation >> 16) & 0xffff) << 10);
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break;
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case R_SH_IMM_LOW16_PCREL:
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relocation -= (Elf32_Addr) location;
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*location = (*location & ~0x3fffc00) |
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((relocation & 0xffff) << 10);
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break;
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case R_SH_IMM_MEDLOW16_PCREL:
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relocation -= (Elf32_Addr) location;
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*location = (*location & ~0x3fffc00) |
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(((relocation >> 16) & 0xffff) << 10);
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break;
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default:
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printk(KERN_ERR "module %s: Unknown relocation: %u\n",
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me->name, ELF32_R_TYPE(rel[i].r_info));
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return -ENOEXEC;
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}
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}
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return 0;
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}
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int module_finalize(const Elf_Ehdr *hdr,
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const Elf_Shdr *sechdrs,
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struct module *me)
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{
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int ret = 0;
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ret |= module_dwarf_finalize(hdr, sechdrs, me);
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return ret;
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}
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void module_arch_cleanup(struct module *mod)
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{
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module_dwarf_cleanup(mod);
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}
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