/* * Copyright 2010 Tilera Corporation. All Rights Reserved. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation, version 2. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or * NON INFRINGEMENT. See the GNU General Public License for * more details. * * Based on i386 version, copyright (C) 2001 Rusty Russell. */ #include <linux/moduleloader.h> #include <linux/elf.h> #include <linux/vmalloc.h> #include <linux/fs.h> #include <linux/string.h> #include <linux/kernel.h> #include <asm/pgtable.h> #include <asm/homecache.h> #include <arch/opcode.h> #ifdef __tilegx__ # define Elf_Rela Elf64_Rela # define ELF_R_SYM ELF64_R_SYM # define ELF_R_TYPE ELF64_R_TYPE #else # define Elf_Rela Elf32_Rela # define ELF_R_SYM ELF32_R_SYM # define ELF_R_TYPE ELF32_R_TYPE #endif #ifdef MODULE_DEBUG #define DEBUGP printk #else #define DEBUGP(fmt...) #endif /* * Allocate some address space in the range MEM_MODULE_START to * MEM_MODULE_END and populate it with memory. */ void *module_alloc(unsigned long size) { struct page **pages; pgprot_t prot_rwx = __pgprot(_PAGE_KERNEL | _PAGE_KERNEL_EXEC); struct vm_struct *area; int i = 0; int npages; if (size == 0) return NULL; npages = (size + PAGE_SIZE - 1) / PAGE_SIZE; pages = kmalloc(npages * sizeof(struct page *), GFP_KERNEL); if (pages == NULL) return NULL; for (; i < npages; ++i) { pages[i] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM); if (!pages[i]) goto error; } area = __get_vm_area(size, VM_ALLOC, MEM_MODULE_START, MEM_MODULE_END); if (!area) goto error; if (map_vm_area(area, prot_rwx, &pages)) { vunmap(area->addr); goto error; } return area->addr; error: while (--i >= 0) __free_page(pages[i]); kfree(pages); return NULL; } /* Free memory returned from module_alloc */ void module_free(struct module *mod, void *module_region) { vfree(module_region); /* Globally flush the L1 icache. */ flush_remote(0, HV_FLUSH_EVICT_L1I, cpu_online_mask, 0, 0, 0, NULL, NULL, 0); /* * FIXME: If module_region == mod->module_init, trim exception * table entries. */ } #ifdef __tilegx__ /* * Validate that the high 16 bits of "value" is just the sign-extension of * the low 48 bits. */ static int validate_hw2_last(long value, struct module *me) { if (((value << 16) >> 16) != value) { pr_warning("module %s: Out of range HW2_LAST value %#lx\n", me->name, value); return 0; } return 1; } /* * Validate that "value" isn't too big to hold in a JumpOff relocation. */ static int validate_jumpoff(long value) { /* Determine size of jump offset. */ int shift = __builtin_clzl(get_JumpOff_X1(create_JumpOff_X1(-1))); /* Check to see if it fits into the relocation slot. */ long f = get_JumpOff_X1(create_JumpOff_X1(value)); f = (f << shift) >> shift; return f == value; } #endif 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; u64 *location; unsigned long value; DEBUGP("Applying relocate section %u to %u\n", relsec, sechdrs[relsec].sh_info); for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { /* This is where to make the change */ location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + rel[i].r_offset; /* * 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); value = sym->st_value + rel[i].r_addend; switch (ELF_R_TYPE(rel[i].r_info)) { #define MUNGE(func) (*location = ((*location & ~func(-1)) | func(value))) #ifndef __tilegx__ case R_TILE_32: *(uint32_t *)location = value; break; case R_TILE_IMM16_X0_HA: value = (value + 0x8000) >> 16; /*FALLTHROUGH*/ case R_TILE_IMM16_X0_LO: MUNGE(create_Imm16_X0); break; case R_TILE_IMM16_X1_HA: value = (value + 0x8000) >> 16; /*FALLTHROUGH*/ case R_TILE_IMM16_X1_LO: MUNGE(create_Imm16_X1); break; case R_TILE_JOFFLONG_X1: value -= (unsigned long) location; /* pc-relative */ value = (long) value >> 3; /* count by instrs */ MUNGE(create_JOffLong_X1); break; #else case R_TILEGX_64: *location = value; break; case R_TILEGX_IMM16_X0_HW2_LAST: if (!validate_hw2_last(value, me)) return -ENOEXEC; value >>= 16; /*FALLTHROUGH*/ case R_TILEGX_IMM16_X0_HW1: value >>= 16; /*FALLTHROUGH*/ case R_TILEGX_IMM16_X0_HW0: MUNGE(create_Imm16_X0); break; case R_TILEGX_IMM16_X1_HW2_LAST: if (!validate_hw2_last(value, me)) return -ENOEXEC; value >>= 16; /*FALLTHROUGH*/ case R_TILEGX_IMM16_X1_HW1: value >>= 16; /*FALLTHROUGH*/ case R_TILEGX_IMM16_X1_HW0: MUNGE(create_Imm16_X1); break; case R_TILEGX_JUMPOFF_X1: value -= (unsigned long) location; /* pc-relative */ value = (long) value >> 3; /* count by instrs */ if (!validate_jumpoff(value)) { pr_warning("module %s: Out of range jump to" " %#llx at %#llx (%p)\n", me->name, sym->st_value + rel[i].r_addend, rel[i].r_offset, location); return -ENOEXEC; } MUNGE(create_JumpOff_X1); break; #endif #undef MUNGE default: pr_err("module %s: Unknown relocation: %d\n", me->name, (int) ELF_R_TYPE(rel[i].r_info)); return -ENOEXEC; } } return 0; }