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![Chris Metcalf](/assets/img/avatar_default.png)
The kernel code was using some <asm> headers that included a mix of hardware-specific information (typically found in Tilera <arch> headers) and structures, enums, and function declarations supporting the disassembly function of the tile-desc.c sources. This change refactors that code so that a hardware-specific, but OS- and application-agnostic header, is created: <arch/opcode.h>. This header is then exported to userspace along with the other <arch> headers and can be used to build userspace code; in particular, it is used by glibc as part of implementing the backtrace() function. The new header, together with a header that specifically describes the disassembly code (<asm/tile-desc.h> with _32 and _64 variants), replaces the old <asm/opcode-tile*.h> and <asm/opcode_constants*.h> headers. As part of this change, we are also renaming the 32-bit constants from TILE_xxx to TILEPRO_xxx to better reflect the fact that they are specific to the TILEPro architecture, and not to TILE-Gx and any successor "tile" architecture chips. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
232 lines
5.6 KiB
C
232 lines
5.6 KiB
C
/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*
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* Based on i386 version, copyright (C) 2001 Rusty Russell.
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*/
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#include <linux/moduleloader.h>
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#include <linux/elf.h>
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#include <linux/vmalloc.h>
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#include <linux/fs.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <asm/pgtable.h>
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#include <asm/homecache.h>
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#include <arch/opcode.h>
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#ifdef __tilegx__
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# define Elf_Rela Elf64_Rela
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# define ELF_R_SYM ELF64_R_SYM
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# define ELF_R_TYPE ELF64_R_TYPE
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#else
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# define Elf_Rela Elf32_Rela
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# define ELF_R_SYM ELF32_R_SYM
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# define ELF_R_TYPE ELF32_R_TYPE
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#endif
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#ifdef MODULE_DEBUG
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#define DEBUGP printk
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#else
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#define DEBUGP(fmt...)
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#endif
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/*
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* Allocate some address space in the range MEM_MODULE_START to
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* MEM_MODULE_END and populate it with memory.
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*/
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void *module_alloc(unsigned long size)
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{
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struct page **pages;
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pgprot_t prot_rwx = __pgprot(_PAGE_KERNEL | _PAGE_KERNEL_EXEC);
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struct vm_struct *area;
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int i = 0;
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int npages;
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if (size == 0)
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return NULL;
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npages = (size + PAGE_SIZE - 1) / PAGE_SIZE;
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pages = kmalloc(npages * sizeof(struct page *), GFP_KERNEL);
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if (pages == NULL)
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return NULL;
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for (; i < npages; ++i) {
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pages[i] = alloc_page(GFP_KERNEL | __GFP_HIGHMEM);
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if (!pages[i])
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goto error;
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}
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area = __get_vm_area(size, VM_ALLOC, MEM_MODULE_START, MEM_MODULE_END);
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if (!area)
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goto error;
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if (map_vm_area(area, prot_rwx, &pages)) {
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vunmap(area->addr);
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goto error;
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}
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return area->addr;
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error:
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while (--i >= 0)
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__free_page(pages[i]);
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kfree(pages);
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return NULL;
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}
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/* Free memory returned from module_alloc */
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void module_free(struct module *mod, void *module_region)
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{
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vfree(module_region);
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/* Globally flush the L1 icache. */
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flush_remote(0, HV_FLUSH_EVICT_L1I, cpu_online_mask,
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0, 0, 0, NULL, NULL, 0);
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/*
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* FIXME: If module_region == mod->module_init, trim exception
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* table entries.
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*/
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}
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#ifdef __tilegx__
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/*
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* Validate that the high 16 bits of "value" is just the sign-extension of
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* the low 48 bits.
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*/
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static int validate_hw2_last(long value, struct module *me)
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{
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if (((value << 16) >> 16) != value) {
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pr_warning("module %s: Out of range HW2_LAST value %#lx\n",
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me->name, value);
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return 0;
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}
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return 1;
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}
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/*
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* Validate that "value" isn't too big to hold in a JumpOff relocation.
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*/
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static int validate_jumpoff(long value)
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{
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/* Determine size of jump offset. */
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int shift = __builtin_clzl(get_JumpOff_X1(create_JumpOff_X1(-1)));
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/* Check to see if it fits into the relocation slot. */
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long f = get_JumpOff_X1(create_JumpOff_X1(value));
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f = (f << shift) >> shift;
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return f == value;
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}
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#endif
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int apply_relocate_add(Elf_Shdr *sechdrs,
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const char *strtab,
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unsigned int symindex,
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unsigned int relsec,
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struct module *me)
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{
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unsigned int i;
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Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
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Elf_Sym *sym;
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u64 *location;
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unsigned long value;
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DEBUGP("Applying relocate section %u to %u\n", relsec,
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sechdrs[relsec].sh_info);
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for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
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/* This is where to make the change */
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location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
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+ rel[i].r_offset;
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/*
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* This is the symbol it is referring to.
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* Note that all undefined symbols have been resolved.
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*/
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sym = (Elf_Sym *)sechdrs[symindex].sh_addr
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+ ELF_R_SYM(rel[i].r_info);
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value = sym->st_value + rel[i].r_addend;
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switch (ELF_R_TYPE(rel[i].r_info)) {
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#define MUNGE(func) (*location = ((*location & ~func(-1)) | func(value)))
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#ifndef __tilegx__
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case R_TILE_32:
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*(uint32_t *)location = value;
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break;
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case R_TILE_IMM16_X0_HA:
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value = (value + 0x8000) >> 16;
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/*FALLTHROUGH*/
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case R_TILE_IMM16_X0_LO:
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MUNGE(create_Imm16_X0);
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break;
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case R_TILE_IMM16_X1_HA:
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value = (value + 0x8000) >> 16;
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/*FALLTHROUGH*/
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case R_TILE_IMM16_X1_LO:
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MUNGE(create_Imm16_X1);
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break;
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case R_TILE_JOFFLONG_X1:
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value -= (unsigned long) location; /* pc-relative */
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value = (long) value >> 3; /* count by instrs */
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MUNGE(create_JOffLong_X1);
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break;
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#else
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case R_TILEGX_64:
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*location = value;
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break;
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case R_TILEGX_IMM16_X0_HW2_LAST:
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if (!validate_hw2_last(value, me))
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return -ENOEXEC;
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value >>= 16;
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/*FALLTHROUGH*/
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case R_TILEGX_IMM16_X0_HW1:
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value >>= 16;
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/*FALLTHROUGH*/
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case R_TILEGX_IMM16_X0_HW0:
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MUNGE(create_Imm16_X0);
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break;
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case R_TILEGX_IMM16_X1_HW2_LAST:
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if (!validate_hw2_last(value, me))
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return -ENOEXEC;
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value >>= 16;
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/*FALLTHROUGH*/
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case R_TILEGX_IMM16_X1_HW1:
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value >>= 16;
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/*FALLTHROUGH*/
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case R_TILEGX_IMM16_X1_HW0:
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MUNGE(create_Imm16_X1);
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break;
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case R_TILEGX_JUMPOFF_X1:
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value -= (unsigned long) location; /* pc-relative */
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value = (long) value >> 3; /* count by instrs */
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if (!validate_jumpoff(value)) {
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pr_warning("module %s: Out of range jump to"
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" %#llx at %#llx (%p)\n", me->name,
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sym->st_value + rel[i].r_addend,
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rel[i].r_offset, location);
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return -ENOEXEC;
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}
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MUNGE(create_JumpOff_X1);
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break;
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#endif
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#undef MUNGE
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default:
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pr_err("module %s: Unknown relocation: %d\n",
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me->name, (int) ELF_R_TYPE(rel[i].r_info));
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return -ENOEXEC;
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}
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}
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return 0;
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}
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