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);
71 if (map_vm_area(area, prot_rwx, &pages)) {
80 __free_page(pages[i]);
86 /* Free memory returned from module_alloc */
87 void module_free(struct module *mod, void *module_region)
91 /* Globally flush the L1 icache. */
92 flush_remote(0, HV_FLUSH_EVICT_L1I, cpu_online_mask,
93 0, 0, 0, NULL, NULL, 0);
96 * FIXME: If module_region == mod->module_init, trim exception
103 * Validate that the high 16 bits of "value" is just the sign-extension of
106 static int validate_hw2_last(long value, struct module *me)
108 if (((value << 16) >> 16) != value) {
109 pr_warning("module %s: Out of range HW2_LAST value %#lx\n",
117 * Validate that "value" isn't too big to hold in a JumpOff relocation.
119 static int validate_jumpoff(long value)
121 /* Determine size of jump offset. */
122 int shift = __builtin_clzl(get_JumpOff_X1(create_JumpOff_X1(-1)));
124 /* Check to see if it fits into the relocation slot. */
125 long f = get_JumpOff_X1(create_JumpOff_X1(value));
126 f = (f << shift) >> shift;
132 int apply_relocate_add(Elf_Shdr *sechdrs,
134 unsigned int symindex,
139 Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
144 DEBUGP("Applying relocate section %u to %u\n", relsec,
145 sechdrs[relsec].sh_info);
146 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
147 /* This is where to make the change */
148 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
151 * This is the symbol it is referring to.
152 * Note that all undefined symbols have been resolved.
154 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
155 + ELF_R_SYM(rel[i].r_info);
156 value = sym->st_value + rel[i].r_addend;
158 switch (ELF_R_TYPE(rel[i].r_info)) {
160 #define MUNGE(func) (*location = ((*location & ~func(-1)) | func(value)))
164 *(uint32_t *)location = value;
166 case R_TILE_IMM16_X0_HA:
167 value = (value + 0x8000) >> 16;
169 case R_TILE_IMM16_X0_LO:
170 MUNGE(create_Imm16_X0);
172 case R_TILE_IMM16_X1_HA:
173 value = (value + 0x8000) >> 16;
175 case R_TILE_IMM16_X1_LO:
176 MUNGE(create_Imm16_X1);
178 case R_TILE_JOFFLONG_X1:
179 value -= (unsigned long) location; /* pc-relative */
180 value = (long) value >> 3; /* count by instrs */
181 MUNGE(create_JOffLong_X1);
187 case R_TILEGX_IMM16_X0_HW2_LAST:
188 if (!validate_hw2_last(value, me))
192 case R_TILEGX_IMM16_X0_HW1:
195 case R_TILEGX_IMM16_X0_HW0:
196 MUNGE(create_Imm16_X0);
198 case R_TILEGX_IMM16_X1_HW2_LAST:
199 if (!validate_hw2_last(value, me))
203 case R_TILEGX_IMM16_X1_HW1:
206 case R_TILEGX_IMM16_X1_HW0:
207 MUNGE(create_Imm16_X1);
209 case R_TILEGX_JUMPOFF_X1:
210 value -= (unsigned long) location; /* pc-relative */
211 value = (long) value >> 3; /* count by instrs */
212 if (!validate_jumpoff(value)) {
213 pr_warning("module %s: Out of range jump to"
214 " %#llx at %#llx (%p)\n", me->name,
215 sym->st_value + rel[i].r_addend,
216 rel[i].r_offset, location);
219 MUNGE(create_JumpOff_X1);
226 pr_err("module %s: Unknown relocation: %d\n",
227 me->name, (int) ELF_R_TYPE(rel[i].r_info));