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124 lines
3.3 KiB
124 lines
3.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* Kernel module help for powerpc. |
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Copyright (C) 2001, 2003 Rusty Russell IBM Corporation. |
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Copyright (C) 2008 Freescale Semiconductor, Inc. |
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*/ |
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#include <linux/elf.h> |
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#include <linux/moduleloader.h> |
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#include <linux/err.h> |
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#include <linux/vmalloc.h> |
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#include <linux/mm.h> |
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#include <linux/bug.h> |
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#include <asm/module.h> |
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#include <linux/uaccess.h> |
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#include <asm/firmware.h> |
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#include <linux/sort.h> |
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#include <asm/setup.h> |
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#include <asm/sections.h> |
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static LIST_HEAD(module_bug_list); |
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static const Elf_Shdr *find_section(const Elf_Ehdr *hdr, |
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const Elf_Shdr *sechdrs, |
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const char *name) |
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{ |
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char *secstrings; |
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unsigned int i; |
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secstrings = (char *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; |
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for (i = 1; i < hdr->e_shnum; i++) |
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if (strcmp(secstrings+sechdrs[i].sh_name, name) == 0) |
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return &sechdrs[i]; |
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return NULL; |
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} |
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int module_finalize(const Elf_Ehdr *hdr, |
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const Elf_Shdr *sechdrs, struct module *me) |
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{ |
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const Elf_Shdr *sect; |
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int rc; |
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rc = module_finalize_ftrace(me, sechdrs); |
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if (rc) |
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return rc; |
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/* Apply feature fixups */ |
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sect = find_section(hdr, sechdrs, "__ftr_fixup"); |
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if (sect != NULL) |
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do_feature_fixups(cur_cpu_spec->cpu_features, |
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(void *)sect->sh_addr, |
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(void *)sect->sh_addr + sect->sh_size); |
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sect = find_section(hdr, sechdrs, "__mmu_ftr_fixup"); |
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if (sect != NULL) |
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do_feature_fixups(cur_cpu_spec->mmu_features, |
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(void *)sect->sh_addr, |
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(void *)sect->sh_addr + sect->sh_size); |
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#ifdef CONFIG_PPC64 |
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sect = find_section(hdr, sechdrs, "__fw_ftr_fixup"); |
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if (sect != NULL) |
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do_feature_fixups(powerpc_firmware_features, |
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(void *)sect->sh_addr, |
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(void *)sect->sh_addr + sect->sh_size); |
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#endif /* CONFIG_PPC64 */ |
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#ifdef PPC64_ELF_ABI_v1 |
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sect = find_section(hdr, sechdrs, ".opd"); |
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if (sect != NULL) { |
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me->arch.start_opd = sect->sh_addr; |
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me->arch.end_opd = sect->sh_addr + sect->sh_size; |
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} |
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#endif /* PPC64_ELF_ABI_v1 */ |
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#ifdef CONFIG_PPC_BARRIER_NOSPEC |
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sect = find_section(hdr, sechdrs, "__spec_barrier_fixup"); |
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if (sect != NULL) |
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do_barrier_nospec_fixups_range(barrier_nospec_enabled, |
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(void *)sect->sh_addr, |
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(void *)sect->sh_addr + sect->sh_size); |
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#endif /* CONFIG_PPC_BARRIER_NOSPEC */ |
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sect = find_section(hdr, sechdrs, "__lwsync_fixup"); |
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if (sect != NULL) |
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do_lwsync_fixups(cur_cpu_spec->cpu_features, |
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(void *)sect->sh_addr, |
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(void *)sect->sh_addr + sect->sh_size); |
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return 0; |
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} |
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static __always_inline void * |
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__module_alloc(unsigned long size, unsigned long start, unsigned long end) |
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{ |
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/* |
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* Don't do huge page allocations for modules yet until more testing |
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* is done. STRICT_MODULE_RWX may require extra work to support this |
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* too. |
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*/ |
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return __vmalloc_node_range(size, 1, start, end, GFP_KERNEL, PAGE_KERNEL_EXEC, |
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VM_FLUSH_RESET_PERMS | VM_NO_HUGE_VMAP, |
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NUMA_NO_NODE, __builtin_return_address(0)); |
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} |
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void *module_alloc(unsigned long size) |
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{ |
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#ifdef MODULES_VADDR |
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unsigned long limit = (unsigned long)_etext - SZ_32M; |
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void *ptr = NULL; |
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BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR); |
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/* First try within 32M limit from _etext to avoid branch trampolines */ |
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if (MODULES_VADDR < PAGE_OFFSET && MODULES_END > limit) |
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ptr = __module_alloc(size, limit, MODULES_END); |
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if (!ptr) |
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ptr = __module_alloc(size, MODULES_VADDR, MODULES_END); |
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return ptr; |
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#else |
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return __module_alloc(size, VMALLOC_START, VMALLOC_END); |
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#endif |
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}
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