xref: /linux-6.15/arch/sparc/kernel/module.c (revision 0cc2dc49)

// 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;
	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)
{
	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 */