module.c

  1// SPDX-License-Identifier: GPL-2.0
  2/* Kernel module help for sparc64.
  3 *
  4 * Copyright (C) 2001 Rusty Russell.
  5 * Copyright (C) 2002 David S. Miller.
  6 */
  7
  8#include <linux/moduleloader.h>
  9#include <linux/kernel.h>
 10#include <linux/elf.h>
 11#include <linux/vmalloc.h>
 12#include <linux/fs.h>
 13#include <linux/gfp.h>
 14#include <linux/string.h>
 15#include <linux/ctype.h>
 16#include <linux/mm.h>
 17
 18#include <asm/processor.h>
 19#include <asm/spitfire.h>
 20#include <asm/cacheflush.h>
 21
 22#include "entry.h"
 23
 24/* Make generic code ignore STT_REGISTER dummy undefined symbols.  */
 25int module_frob_arch_sections(Elf_Ehdr *hdr,
 26			      Elf_Shdr *sechdrs,
 27			      char *secstrings,
 28			      struct module *mod)
 29{
 30	unsigned int symidx;
 31	Elf_Sym *sym;
 32	char *strtab;
 33	int i;
 34
 35	for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
 36		if (symidx == hdr->e_shnum-1) {
 37			printk("%s: no symtab found.\n", mod->name);
 38			return -ENOEXEC;
 39		}
 40	}
 41	sym = (Elf_Sym *)sechdrs[symidx].sh_addr;
 42	strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
 43
 44	for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
 45		if (sym[i].st_shndx == SHN_UNDEF) {
 46			if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER)
 47				sym[i].st_shndx = SHN_ABS;
 48		}
 49	}
 50	return 0;
 51}
 52
 53int apply_relocate_add(Elf_Shdr *sechdrs,
 54		       const char *strtab,
 55		       unsigned int symindex,
 56		       unsigned int relsec,
 57		       struct module *me)
 58{
 59	unsigned int i;
 60	Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
 61	Elf_Sym *sym;
 62	u8 *location;
 63	u32 *loc32;
 64
 65	for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
 66		Elf_Addr v;
 67
 68		/* This is where to make the change */
 69		location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
 70			+ rel[i].r_offset;
 71		loc32 = (u32 *) location;
 72
 73#ifdef CONFIG_SPARC64
 74		BUG_ON(((u64)location >> (u64)32) != (u64)0);
 75#endif /* CONFIG_SPARC64 */
 76
 77		/* This is the symbol it is referring to.  Note that all
 78		   undefined symbols have been resolved.  */
 79		sym = (Elf_Sym *)sechdrs[symindex].sh_addr
 80			+ ELF_R_SYM(rel[i].r_info);
 81		v = sym->st_value + rel[i].r_addend;
 82
 83		switch (ELF_R_TYPE(rel[i].r_info) & 0xff) {
 84		case R_SPARC_DISP32:
 85			v -= (Elf_Addr) location;
 86			*loc32 = v;
 87			break;
 88#ifdef CONFIG_SPARC64
 89		case R_SPARC_64:
 90		case R_SPARC_UA64:
 91			location[0] = v >> 56;
 92			location[1] = v >> 48;
 93			location[2] = v >> 40;
 94			location[3] = v >> 32;
 95			location[4] = v >> 24;
 96			location[5] = v >> 16;
 97			location[6] = v >>  8;
 98			location[7] = v >>  0;
 99			break;
100
101		case R_SPARC_WDISP19:
102			v -= (Elf_Addr) location;
103			*loc32 = (*loc32 & ~0x7ffff) |
104				((v >> 2) & 0x7ffff);
105			break;
106
107		case R_SPARC_OLO10:
108			*loc32 = (*loc32 & ~0x1fff) |
109				(((v & 0x3ff) +
110				  (ELF_R_TYPE(rel[i].r_info) >> 8))
111				 & 0x1fff);
112			break;
113#endif /* CONFIG_SPARC64 */
114
115		case R_SPARC_32:
116		case R_SPARC_UA32:
117			location[0] = v >> 24;
118			location[1] = v >> 16;
119			location[2] = v >>  8;
120			location[3] = v >>  0;
121			break;
122
123		case R_SPARC_WDISP30:
124			v -= (Elf_Addr) location;
125			*loc32 = (*loc32 & ~0x3fffffff) |
126				((v >> 2) & 0x3fffffff);
127			break;
128
129		case R_SPARC_WDISP22:
130			v -= (Elf_Addr) location;
131			*loc32 = (*loc32 & ~0x3fffff) |
132				((v >> 2) & 0x3fffff);
133			break;
134
135		case R_SPARC_LO10:
136			*loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
137			break;
138
139		case R_SPARC_HI22:
140			*loc32 = (*loc32 & ~0x3fffff) |
141				((v >> 10) & 0x3fffff);
142			break;
143
144		default:
145			printk(KERN_ERR "module %s: Unknown relocation: 0x%x\n",
146			       me->name,
147			       (int) (ELF_R_TYPE(rel[i].r_info) & 0xff));
148			return -ENOEXEC;
149		}
150	}
151	return 0;
152}
153
154#ifdef CONFIG_SPARC64
155static void do_patch_sections(const Elf_Ehdr *hdr,
156			      const Elf_Shdr *sechdrs)
157{
158	const Elf_Shdr *s, *sun4v_1insn = NULL, *sun4v_2insn = NULL;
159	char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
160
161	for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
162		if (!strcmp(".sun4v_1insn_patch", secstrings + s->sh_name))
163			sun4v_1insn = s;
164		if (!strcmp(".sun4v_2insn_patch", secstrings + s->sh_name))
165			sun4v_2insn = s;
166	}
167
168	if (sun4v_1insn && tlb_type == hypervisor) {
169		void *p = (void *) sun4v_1insn->sh_addr;
170		sun4v_patch_1insn_range(p, p + sun4v_1insn->sh_size);
171	}
172	if (sun4v_2insn && tlb_type == hypervisor) {
173		void *p = (void *) sun4v_2insn->sh_addr;
174		sun4v_patch_2insn_range(p, p + sun4v_2insn->sh_size);
175	}
176}
177
178int module_finalize(const Elf_Ehdr *hdr,
179		    const Elf_Shdr *sechdrs,
180		    struct module *me)
181{
182	do_patch_sections(hdr, sechdrs);
183
184	/* Cheetah's I-cache is fully coherent.  */
185	if (tlb_type == spitfire) {
186		unsigned long va;
187
188		flushw_all();
189		for (va =  0; va < (PAGE_SIZE << 1); va += 32)
190			spitfire_put_icache_tag(va, 0x0);
191		__asm__ __volatile__("flush %g6");
192	}
193
194	return 0;
195}
196#endif /* CONFIG_SPARC64 */