2 * Copyright 2010 Tilera Corporation. All Rights Reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation, version 2.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
11 * NON INFRINGEMENT. See the GNU General Public License for
14 * Based on i386 version, copyright (C) 2001 Rusty Russell.
17 #include <linux/moduleloader.h>
18 #include <linux/elf.h>
19 #include <linux/vmalloc.h>
21 #include <linux/string.h>
22 #include <linux/kernel.h>
23 #include <asm/opcode-tile.h>
24 #include <asm/pgtable.h>
27 # define Elf_Rela Elf64_Rela
28 # define ELF_R_SYM ELF64_R_SYM
29 # define ELF_R_TYPE ELF64_R_TYPE
31 # define Elf_Rela Elf32_Rela
32 # define ELF_R_SYM ELF32_R_SYM
33 # define ELF_R_TYPE ELF32_R_TYPE
39 #define DEBUGP(fmt...)
43 * Allocate some address space in the range MEM_MODULE_START to
44 * MEM_MODULE_END and populate it with memory.
46 void *module_alloc(unsigned long size)
49 pgprot_t prot_rwx = __pgprot(_PAGE_KERNEL | _PAGE_KERNEL_EXEC);
50 struct vm_struct *area;
56 npages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
57 pages = kmalloc(npages * sizeof(struct page *), GFP_KERNEL);
60 for (; i < npages; ++i) {
61 pages[i] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
66 area = __get_vm_area(size, VM_ALLOC, MEM_MODULE_START, MEM_MODULE_END);
70 if (map_vm_area(area, prot_rwx, &pages)) {
79 __free_page(pages[i]);
85 /* Free memory returned from module_alloc */
86 void module_free(struct module *mod, void *module_region)
90 * FIXME: If module_region == mod->init_region, trim exception
95 /* We don't need anything special. */
96 int module_frob_arch_sections(Elf_Ehdr *hdr,
104 int apply_relocate(Elf_Shdr *sechdrs,
106 unsigned int symindex,
110 pr_err("module %s: .rel relocation unsupported\n", me->name);
116 * Validate that the high 16 bits of "value" is just the sign-extension of
119 static int validate_hw2_last(long value, struct module *me)
121 if (((value << 16) >> 16) != value) {
122 pr_warning("module %s: Out of range HW2_LAST value %#lx\n",
130 * Validate that "value" isn't too big to hold in a JumpOff relocation.
132 static int validate_jumpoff(long value)
134 /* Determine size of jump offset. */
135 int shift = __builtin_clzl(get_JumpOff_X1(create_JumpOff_X1(-1)));
137 /* Check to see if it fits into the relocation slot. */
138 long f = get_JumpOff_X1(create_JumpOff_X1(value));
139 f = (f << shift) >> shift;
145 int apply_relocate_add(Elf_Shdr *sechdrs,
147 unsigned int symindex,
152 Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
157 DEBUGP("Applying relocate section %u to %u\n", relsec,
158 sechdrs[relsec].sh_info);
159 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
160 /* This is where to make the change */
161 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
164 * This is the symbol it is referring to.
165 * Note that all undefined symbols have been resolved.
167 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
168 + ELF_R_SYM(rel[i].r_info);
169 value = sym->st_value + rel[i].r_addend;
171 switch (ELF_R_TYPE(rel[i].r_info)) {
173 #define MUNGE(func) (*location = ((*location & ~func(-1)) | func(value)))
177 *(uint32_t *)location = value;
179 case R_TILE_IMM16_X0_HA:
180 value = (value + 0x8000) >> 16;
182 case R_TILE_IMM16_X0_LO:
183 MUNGE(create_Imm16_X0);
185 case R_TILE_IMM16_X1_HA:
186 value = (value + 0x8000) >> 16;
188 case R_TILE_IMM16_X1_LO:
189 MUNGE(create_Imm16_X1);
191 case R_TILE_JOFFLONG_X1:
192 value -= (unsigned long) location; /* pc-relative */
193 value = (long) value >> 3; /* count by instrs */
194 MUNGE(create_JOffLong_X1);
200 case R_TILEGX_IMM16_X0_HW2_LAST:
201 if (!validate_hw2_last(value, me))
205 case R_TILEGX_IMM16_X0_HW1:
208 case R_TILEGX_IMM16_X0_HW0:
209 MUNGE(create_Imm16_X0);
211 case R_TILEGX_IMM16_X1_HW2_LAST:
212 if (!validate_hw2_last(value, me))
216 case R_TILEGX_IMM16_X1_HW1:
219 case R_TILEGX_IMM16_X1_HW0:
220 MUNGE(create_Imm16_X1);
222 case R_TILEGX_JUMPOFF_X1:
223 value -= (unsigned long) location; /* pc-relative */
224 value = (long) value >> 3; /* count by instrs */
225 if (!validate_jumpoff(value)) {
226 pr_warning("module %s: Out of range jump to"
227 " %#llx at %#llx (%p)\n", me->name,
228 sym->st_value + rel[i].r_addend,
229 rel[i].r_offset, location);
232 MUNGE(create_JumpOff_X1);
239 pr_err("module %s: Unknown relocation: %d\n",
240 me->name, (int) ELF_R_TYPE(rel[i].r_info));
247 int module_finalize(const Elf_Ehdr *hdr,
248 const Elf_Shdr *sechdrs,
251 /* FIXME: perhaps remove the "writable" bit from the TLB? */
255 void module_arch_cleanup(struct module *mod)