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/pgtable.h>
24 #include <asm/homecache.h>
25 #include <arch/opcode.h>
28 # define Elf_Rela Elf64_Rela
29 # define ELF_R_SYM ELF64_R_SYM
30 # define ELF_R_TYPE ELF64_R_TYPE
32 # define Elf_Rela Elf32_Rela
33 # define ELF_R_SYM ELF32_R_SYM
34 # define ELF_R_TYPE ELF32_R_TYPE
40 #define DEBUGP(fmt...)
44 * Allocate some address space in the range MEM_MODULE_START to
45 * MEM_MODULE_END and populate it with memory.
47 void *module_alloc(unsigned long size)
50 pgprot_t prot_rwx = __pgprot(_PAGE_KERNEL | _PAGE_KERNEL_EXEC);
51 struct vm_struct *area;
57 npages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
58 pages = kmalloc(npages * sizeof(struct page *), GFP_KERNEL);
61 for (; i < npages; ++i) {
62 pages[i] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
67 area = __get_vm_area(size, VM_ALLOC, MEM_MODULE_START, MEM_MODULE_END);
70 area->nr_pages = npages;
73 if (map_vm_area(area, prot_rwx, &pages)) {
82 __free_page(pages[i]);
88 /* Free memory returned from module_alloc */
89 void module_free(struct module *mod, void *module_region)
93 /* Globally flush the L1 icache. */
94 flush_remote(0, HV_FLUSH_EVICT_L1I, cpu_online_mask,
95 0, 0, 0, NULL, NULL, 0);
98 * FIXME: If module_region == mod->module_init, trim exception
105 * Validate that the high 16 bits of "value" is just the sign-extension of
108 static int validate_hw2_last(long value, struct module *me)
110 if (((value << 16) >> 16) != value) {
111 pr_warning("module %s: Out of range HW2_LAST value %#lx\n",
119 * Validate that "value" isn't too big to hold in a JumpOff relocation.
121 static int validate_jumpoff(long value)
123 /* Determine size of jump offset. */
124 int shift = __builtin_clzl(get_JumpOff_X1(create_JumpOff_X1(-1)));
126 /* Check to see if it fits into the relocation slot. */
127 long f = get_JumpOff_X1(create_JumpOff_X1(value));
128 f = (f << shift) >> shift;
134 int apply_relocate_add(Elf_Shdr *sechdrs,
136 unsigned int symindex,
141 Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
146 DEBUGP("Applying relocate section %u to %u\n", relsec,
147 sechdrs[relsec].sh_info);
148 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
149 /* This is where to make the change */
150 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
153 * This is the symbol it is referring to.
154 * Note that all undefined symbols have been resolved.
156 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
157 + ELF_R_SYM(rel[i].r_info);
158 value = sym->st_value + rel[i].r_addend;
160 switch (ELF_R_TYPE(rel[i].r_info)) {
162 #define MUNGE(func) (*location = ((*location & ~func(-1)) | func(value)))
166 *(uint32_t *)location = value;
168 case R_TILE_IMM16_X0_HA:
169 value = (value + 0x8000) >> 16;
171 case R_TILE_IMM16_X0_LO:
172 MUNGE(create_Imm16_X0);
174 case R_TILE_IMM16_X1_HA:
175 value = (value + 0x8000) >> 16;
177 case R_TILE_IMM16_X1_LO:
178 MUNGE(create_Imm16_X1);
180 case R_TILE_JOFFLONG_X1:
181 value -= (unsigned long) location; /* pc-relative */
182 value = (long) value >> 3; /* count by instrs */
183 MUNGE(create_JOffLong_X1);
189 case R_TILEGX_IMM16_X0_HW2_LAST:
190 if (!validate_hw2_last(value, me))
194 case R_TILEGX_IMM16_X0_HW1:
197 case R_TILEGX_IMM16_X0_HW0:
198 MUNGE(create_Imm16_X0);
200 case R_TILEGX_IMM16_X1_HW2_LAST:
201 if (!validate_hw2_last(value, me))
205 case R_TILEGX_IMM16_X1_HW1:
208 case R_TILEGX_IMM16_X1_HW0:
209 MUNGE(create_Imm16_X1);
211 case R_TILEGX_JUMPOFF_X1:
212 value -= (unsigned long) location; /* pc-relative */
213 value = (long) value >> 3; /* count by instrs */
214 if (!validate_jumpoff(value)) {
215 pr_warning("module %s: Out of range jump to"
216 " %#llx at %#llx (%p)\n", me->name,
217 sym->st_value + rel[i].r_addend,
218 rel[i].r_offset, location);
221 MUNGE(create_JumpOff_X1);
228 pr_err("module %s: Unknown relocation: %d\n",
229 me->name, (int) ELF_R_TYPE(rel[i].r_info));