Merge git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus
* git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus: module: convert to stop_machine_create/destroy. stop_machine: introduce stop_machine_create/destroy. parisc: fix module loading failure of large kernel modules module: fix module loading failure of large kernel modules for parisc module: fix warning of unused function when !CONFIG_PROC_FS kernel/module.c: compare symbol values when marking symbols as exported in /proc/kallsyms. remove CONFIG_KMOD
This commit is contained in:
Коммит
0bbb275358
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@ -23,8 +23,10 @@ struct mod_arch_specific
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{
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unsigned long got_offset, got_count, got_max;
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unsigned long fdesc_offset, fdesc_count, fdesc_max;
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unsigned long stub_offset, stub_count, stub_max;
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unsigned long init_stub_offset, init_stub_count, init_stub_max;
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struct {
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unsigned long stub_offset;
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unsigned int stub_entries;
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} *section;
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int unwind_section;
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struct unwind_table *unwind;
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};
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@ -6,6 +6,7 @@
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*
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* Linux/PA-RISC Project (http://www.parisc-linux.org/)
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* Copyright (C) 2003 Randolph Chung <tausq at debian . org>
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* Copyright (C) 2008 Helge Deller <deller@gmx.de>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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@ -24,6 +25,19 @@
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*
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*
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* Notes:
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* - PLT stub handling
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* On 32bit (and sometimes 64bit) and with big kernel modules like xfs or
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* ipv6 the relocation types R_PARISC_PCREL17F and R_PARISC_PCREL22F may
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* fail to reach their PLT stub if we only create one big stub array for
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* all sections at the beginning of the core or init section.
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* Instead we now insert individual PLT stub entries directly in front of
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* of the code sections where the stubs are actually called.
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* This reduces the distance between the PCREL location and the stub entry
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* so that the relocations can be fulfilled.
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* While calculating the final layout of the kernel module in memory, the
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* kernel module loader calls arch_mod_section_prepend() to request the
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* to be reserved amount of memory in front of each individual section.
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*
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* - SEGREL32 handling
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* We are not doing SEGREL32 handling correctly. According to the ABI, we
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* should do a value offset, like this:
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@ -58,9 +72,13 @@
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#define DEBUGP(fmt...)
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#endif
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#define RELOC_REACHABLE(val, bits) \
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(( ( !((val) & (1<<((bits)-1))) && ((val)>>(bits)) != 0 ) || \
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( ((val) & (1<<((bits)-1))) && ((val)>>(bits)) != (((__typeof__(val))(~0))>>((bits)+2)))) ? \
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0 : 1)
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#define CHECK_RELOC(val, bits) \
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if ( ( !((val) & (1<<((bits)-1))) && ((val)>>(bits)) != 0 ) || \
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( ((val) & (1<<((bits)-1))) && ((val)>>(bits)) != (((__typeof__(val))(~0))>>((bits)+2)))) { \
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if (!RELOC_REACHABLE(val, bits)) { \
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printk(KERN_ERR "module %s relocation of symbol %s is out of range (0x%lx in %d bits)\n", \
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me->name, strtab + sym->st_name, (unsigned long)val, bits); \
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return -ENOEXEC; \
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@ -92,13 +110,6 @@ static inline int in_local(struct module *me, void *loc)
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return in_init(me, loc) || in_core(me, loc);
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}
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static inline int in_local_section(struct module *me, void *loc, void *dot)
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{
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return (in_init(me, loc) && in_init(me, dot)) ||
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(in_core(me, loc) && in_core(me, dot));
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}
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#ifndef CONFIG_64BIT
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struct got_entry {
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Elf32_Addr addr;
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@ -258,23 +269,42 @@ static inline unsigned long count_stubs(const Elf_Rela *rela, unsigned long n)
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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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kfree(mod->arch.section);
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mod->arch.section = NULL;
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vfree(module_region);
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/* FIXME: If module_region == mod->init_region, trim exception
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table entries. */
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}
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/* Additional bytes needed in front of individual sections */
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unsigned int arch_mod_section_prepend(struct module *mod,
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unsigned int section)
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{
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/* size needed for all stubs of this section (including
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* one additional for correct alignment of the stubs) */
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return (mod->arch.section[section].stub_entries + 1)
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* sizeof(struct stub_entry);
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}
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#define CONST
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int module_frob_arch_sections(CONST Elf_Ehdr *hdr,
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CONST Elf_Shdr *sechdrs,
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CONST char *secstrings,
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struct module *me)
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{
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unsigned long gots = 0, fdescs = 0, stubs = 0, init_stubs = 0;
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unsigned long gots = 0, fdescs = 0, len;
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unsigned int i;
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len = hdr->e_shnum * sizeof(me->arch.section[0]);
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me->arch.section = kzalloc(len, GFP_KERNEL);
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if (!me->arch.section)
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return -ENOMEM;
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for (i = 1; i < hdr->e_shnum; i++) {
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const Elf_Rela *rels = (void *)hdr + sechdrs[i].sh_offset;
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const Elf_Rela *rels = (void *)sechdrs[i].sh_addr;
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unsigned long nrels = sechdrs[i].sh_size / sizeof(*rels);
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unsigned int count, s;
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if (strncmp(secstrings + sechdrs[i].sh_name,
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".PARISC.unwind", 14) == 0)
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@ -290,11 +320,23 @@ int module_frob_arch_sections(CONST Elf_Ehdr *hdr,
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*/
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gots += count_gots(rels, nrels);
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fdescs += count_fdescs(rels, nrels);
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if(strncmp(secstrings + sechdrs[i].sh_name,
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".rela.init", 10) == 0)
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init_stubs += count_stubs(rels, nrels);
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else
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stubs += count_stubs(rels, nrels);
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/* XXX: By sorting the relocs and finding duplicate entries
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* we could reduce the number of necessary stubs and save
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* some memory. */
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count = count_stubs(rels, nrels);
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if (!count)
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continue;
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/* so we need relocation stubs. reserve necessary memory. */
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/* sh_info gives the section for which we need to add stubs. */
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s = sechdrs[i].sh_info;
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/* each code section should only have one relocation section */
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WARN_ON(me->arch.section[s].stub_entries);
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/* store number of stubs we need for this section */
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me->arch.section[s].stub_entries += count;
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}
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/* align things a bit */
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@ -306,18 +348,8 @@ int module_frob_arch_sections(CONST Elf_Ehdr *hdr,
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me->arch.fdesc_offset = me->core_size;
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me->core_size += fdescs * sizeof(Elf_Fdesc);
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me->core_size = ALIGN(me->core_size, 16);
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me->arch.stub_offset = me->core_size;
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me->core_size += stubs * sizeof(struct stub_entry);
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me->init_size = ALIGN(me->init_size, 16);
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me->arch.init_stub_offset = me->init_size;
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me->init_size += init_stubs * sizeof(struct stub_entry);
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me->arch.got_max = gots;
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me->arch.fdesc_max = fdescs;
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me->arch.stub_max = stubs;
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me->arch.init_stub_max = init_stubs;
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return 0;
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}
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@ -380,23 +412,27 @@ enum elf_stub_type {
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};
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static Elf_Addr get_stub(struct module *me, unsigned long value, long addend,
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enum elf_stub_type stub_type, int init_section)
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enum elf_stub_type stub_type, Elf_Addr loc0, unsigned int targetsec)
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{
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unsigned long i;
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struct stub_entry *stub;
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if(init_section) {
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i = me->arch.init_stub_count++;
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BUG_ON(me->arch.init_stub_count > me->arch.init_stub_max);
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stub = me->module_init + me->arch.init_stub_offset +
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i * sizeof(struct stub_entry);
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} else {
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i = me->arch.stub_count++;
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BUG_ON(me->arch.stub_count > me->arch.stub_max);
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stub = me->module_core + me->arch.stub_offset +
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i * sizeof(struct stub_entry);
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/* initialize stub_offset to point in front of the section */
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if (!me->arch.section[targetsec].stub_offset) {
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loc0 -= (me->arch.section[targetsec].stub_entries + 1) *
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sizeof(struct stub_entry);
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/* get correct alignment for the stubs */
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loc0 = ALIGN(loc0, sizeof(struct stub_entry));
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me->arch.section[targetsec].stub_offset = loc0;
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}
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/* get address of stub entry */
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stub = (void *) me->arch.section[targetsec].stub_offset;
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me->arch.section[targetsec].stub_offset += sizeof(struct stub_entry);
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/* do not write outside available stub area */
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BUG_ON(0 == me->arch.section[targetsec].stub_entries--);
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#ifndef CONFIG_64BIT
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/* for 32-bit the stub looks like this:
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* ldil L'XXX,%r1
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@ -489,15 +525,19 @@ int apply_relocate_add(Elf_Shdr *sechdrs,
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Elf32_Addr val;
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Elf32_Sword addend;
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Elf32_Addr dot;
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Elf_Addr loc0;
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unsigned int targetsec = sechdrs[relsec].sh_info;
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//unsigned long dp = (unsigned long)$global$;
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register unsigned long dp asm ("r27");
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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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targetsec);
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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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loc = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
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loc = (void *)sechdrs[targetsec].sh_addr
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+ rel[i].r_offset;
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/* This is the start of the target section */
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loc0 = sechdrs[targetsec].sh_addr;
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/* This is the symbol it is referring to */
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sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
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+ ELF32_R_SYM(rel[i].r_info);
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@ -569,19 +609,32 @@ int apply_relocate_add(Elf_Shdr *sechdrs,
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break;
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case R_PARISC_PCREL17F:
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/* 17-bit PC relative address */
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val = get_stub(me, val, addend, ELF_STUB_GOT, in_init(me, loc));
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/* calculate direct call offset */
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val += addend;
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val = (val - dot - 8)/4;
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CHECK_RELOC(val, 17)
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if (!RELOC_REACHABLE(val, 17)) {
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/* direct distance too far, create
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* stub entry instead */
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val = get_stub(me, sym->st_value, addend,
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ELF_STUB_DIRECT, loc0, targetsec);
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val = (val - dot - 8)/4;
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CHECK_RELOC(val, 17);
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}
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*loc = (*loc & ~0x1f1ffd) | reassemble_17(val);
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break;
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case R_PARISC_PCREL22F:
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/* 22-bit PC relative address; only defined for pa20 */
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val = get_stub(me, val, addend, ELF_STUB_GOT, in_init(me, loc));
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DEBUGP("STUB FOR %s loc %lx+%lx at %lx\n",
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strtab + sym->st_name, (unsigned long)loc, addend,
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val)
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/* calculate direct call offset */
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val += addend;
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val = (val - dot - 8)/4;
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CHECK_RELOC(val, 22);
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if (!RELOC_REACHABLE(val, 22)) {
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/* direct distance too far, create
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* stub entry instead */
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val = get_stub(me, sym->st_value, addend,
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ELF_STUB_DIRECT, loc0, targetsec);
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val = (val - dot - 8)/4;
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CHECK_RELOC(val, 22);
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}
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*loc = (*loc & ~0x3ff1ffd) | reassemble_22(val);
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break;
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|
@ -610,13 +663,17 @@ int apply_relocate_add(Elf_Shdr *sechdrs,
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Elf64_Addr val;
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Elf64_Sxword addend;
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Elf64_Addr dot;
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Elf_Addr loc0;
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unsigned int targetsec = sechdrs[relsec].sh_info;
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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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targetsec);
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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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loc = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
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loc = (void *)sechdrs[targetsec].sh_addr
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+ rel[i].r_offset;
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/* This is the start of the target section */
|
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loc0 = sechdrs[targetsec].sh_addr;
|
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/* This is the symbol it is referring to */
|
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sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
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+ ELF64_R_SYM(rel[i].r_info);
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|
@ -672,42 +729,40 @@ int apply_relocate_add(Elf_Shdr *sechdrs,
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DEBUGP("PCREL22F Symbol %s loc %p val %lx\n",
|
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strtab + sym->st_name,
|
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loc, val);
|
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val += addend;
|
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/* can we reach it locally? */
|
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if(!in_local_section(me, (void *)val, (void *)dot)) {
|
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|
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if (in_local(me, (void *)val))
|
||||
/* this is the case where the
|
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* symbol is local to the
|
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* module, but in a different
|
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* section, so stub the jump
|
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* in case it's more than 22
|
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* bits away */
|
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val = get_stub(me, val, addend, ELF_STUB_DIRECT,
|
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in_init(me, loc));
|
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else if (strncmp(strtab + sym->st_name, "$$", 2)
|
||||
if (in_local(me, (void *)val)) {
|
||||
/* this is the case where the symbol is local
|
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* to the module, but in a different section,
|
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* so stub the jump in case it's more than 22
|
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* bits away */
|
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val = (val - dot - 8)/4;
|
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if (!RELOC_REACHABLE(val, 22)) {
|
||||
/* direct distance too far, create
|
||||
* stub entry instead */
|
||||
val = get_stub(me, sym->st_value,
|
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addend, ELF_STUB_DIRECT,
|
||||
loc0, targetsec);
|
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} else {
|
||||
/* Ok, we can reach it directly. */
|
||||
val = sym->st_value;
|
||||
val += addend;
|
||||
}
|
||||
} else {
|
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val = sym->st_value;
|
||||
if (strncmp(strtab + sym->st_name, "$$", 2)
|
||||
== 0)
|
||||
val = get_stub(me, val, addend, ELF_STUB_MILLI,
|
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in_init(me, loc));
|
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loc0, targetsec);
|
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else
|
||||
val = get_stub(me, val, addend, ELF_STUB_GOT,
|
||||
in_init(me, loc));
|
||||
loc0, targetsec);
|
||||
}
|
||||
DEBUGP("STUB FOR %s loc %lx, val %lx+%lx at %lx\n",
|
||||
strtab + sym->st_name, loc, sym->st_value,
|
||||
addend, val);
|
||||
/* FIXME: local symbols work as long as the
|
||||
* core and init pieces aren't separated too
|
||||
* far. If this is ever broken, you will trip
|
||||
* the check below. The way to fix it would
|
||||
* be to generate local stubs to go between init
|
||||
* and core */
|
||||
if((Elf64_Sxword)(val - dot - 8) > 0x800000 -1 ||
|
||||
(Elf64_Sxword)(val - dot - 8) < -0x800000) {
|
||||
printk(KERN_ERR "Module %s, symbol %s is out of range for PCREL22F relocation\n",
|
||||
me->name, strtab + sym->st_name);
|
||||
return -ENOEXEC;
|
||||
}
|
||||
val = (val - dot - 8)/4;
|
||||
CHECK_RELOC(val, 22);
|
||||
*loc = (*loc & ~0x3ff1ffd) | reassemble_22(val);
|
||||
break;
|
||||
case R_PARISC_DIR64:
|
||||
|
@ -794,12 +849,8 @@ int module_finalize(const Elf_Ehdr *hdr,
|
|||
addr = (u32 *)entry->addr;
|
||||
printk("INSNS: %x %x %x %x\n",
|
||||
addr[0], addr[1], addr[2], addr[3]);
|
||||
printk("stubs used %ld, stubs max %ld\n"
|
||||
"init_stubs used %ld, init stubs max %ld\n"
|
||||
"got entries used %ld, gots max %ld\n"
|
||||
printk("got entries used %ld, gots max %ld\n"
|
||||
"fdescs used %ld, fdescs max %ld\n",
|
||||
me->arch.stub_count, me->arch.stub_max,
|
||||
me->arch.init_stub_count, me->arch.init_stub_max,
|
||||
me->arch.got_count, me->arch.got_max,
|
||||
me->arch.fdesc_count, me->arch.fdesc_max);
|
||||
#endif
|
||||
|
@ -829,7 +880,10 @@ int module_finalize(const Elf_Ehdr *hdr,
|
|||
me->name, me->arch.got_count, MAX_GOTS);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
|
||||
kfree(me->arch.section);
|
||||
me->arch.section = NULL;
|
||||
|
||||
/* no symbol table */
|
||||
if(symhdr == NULL)
|
||||
return 0;
|
||||
|
|
|
@ -13,6 +13,9 @@ int module_frob_arch_sections(Elf_Ehdr *hdr,
|
|||
char *secstrings,
|
||||
struct module *mod);
|
||||
|
||||
/* Additional bytes needed by arch in front of individual sections */
|
||||
unsigned int arch_mod_section_prepend(struct module *mod, unsigned int section);
|
||||
|
||||
/* Allocator used for allocating struct module, core sections and init
|
||||
sections. Returns NULL on failure. */
|
||||
void *module_alloc(unsigned long size);
|
||||
|
|
|
@ -35,6 +35,24 @@ int stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus);
|
|||
* won't come or go while it's being called. Used by hotplug cpu.
|
||||
*/
|
||||
int __stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus);
|
||||
|
||||
/**
|
||||
* stop_machine_create: create all stop_machine threads
|
||||
*
|
||||
* Description: This causes all stop_machine threads to be created before
|
||||
* stop_machine actually gets called. This can be used by subsystems that
|
||||
* need a non failing stop_machine infrastructure.
|
||||
*/
|
||||
int stop_machine_create(void);
|
||||
|
||||
/**
|
||||
* stop_machine_destroy: destroy all stop_machine threads
|
||||
*
|
||||
* Description: This causes all stop_machine threads which were created with
|
||||
* stop_machine_create to be destroyed again.
|
||||
*/
|
||||
void stop_machine_destroy(void);
|
||||
|
||||
#else
|
||||
|
||||
static inline int stop_machine(int (*fn)(void *), void *data,
|
||||
|
@ -46,5 +64,9 @@ static inline int stop_machine(int (*fn)(void *), void *data,
|
|||
local_irq_enable();
|
||||
return ret;
|
||||
}
|
||||
|
||||
static inline int stop_machine_create(void) { return 0; }
|
||||
static inline void stop_machine_destroy(void) { }
|
||||
|
||||
#endif /* CONFIG_SMP */
|
||||
#endif /* _LINUX_STOP_MACHINE */
|
||||
|
|
|
@ -916,12 +916,6 @@ config MODULE_SRCVERSION_ALL
|
|||
the version). With this option, such a "srcversion" field
|
||||
will be created for all modules. If unsure, say N.
|
||||
|
||||
config KMOD
|
||||
def_bool y
|
||||
help
|
||||
This is being removed soon. These days, CONFIG_MODULES
|
||||
implies CONFIG_KMOD, so use that instead.
|
||||
|
||||
endif # MODULES
|
||||
|
||||
config INIT_ALL_POSSIBLE
|
||||
|
|
|
@ -269,8 +269,11 @@ out_release:
|
|||
|
||||
int __ref cpu_down(unsigned int cpu)
|
||||
{
|
||||
int err = 0;
|
||||
int err;
|
||||
|
||||
err = stop_machine_create();
|
||||
if (err)
|
||||
return err;
|
||||
cpu_maps_update_begin();
|
||||
|
||||
if (cpu_hotplug_disabled) {
|
||||
|
@ -297,6 +300,7 @@ int __ref cpu_down(unsigned int cpu)
|
|||
|
||||
out:
|
||||
cpu_maps_update_done();
|
||||
stop_machine_destroy();
|
||||
return err;
|
||||
}
|
||||
EXPORT_SYMBOL(cpu_down);
|
||||
|
|
|
@ -757,8 +757,16 @@ sys_delete_module(const char __user *name_user, unsigned int flags)
|
|||
return -EFAULT;
|
||||
name[MODULE_NAME_LEN-1] = '\0';
|
||||
|
||||
if (mutex_lock_interruptible(&module_mutex) != 0)
|
||||
return -EINTR;
|
||||
/* Create stop_machine threads since free_module relies on
|
||||
* a non-failing stop_machine call. */
|
||||
ret = stop_machine_create();
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (mutex_lock_interruptible(&module_mutex) != 0) {
|
||||
ret = -EINTR;
|
||||
goto out_stop;
|
||||
}
|
||||
|
||||
mod = find_module(name);
|
||||
if (!mod) {
|
||||
|
@ -817,10 +825,12 @@ sys_delete_module(const char __user *name_user, unsigned int flags)
|
|||
|
||||
out:
|
||||
mutex_unlock(&module_mutex);
|
||||
out_stop:
|
||||
stop_machine_destroy();
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void print_unload_info(struct seq_file *m, struct module *mod)
|
||||
static inline void print_unload_info(struct seq_file *m, struct module *mod)
|
||||
{
|
||||
struct module_use *use;
|
||||
int printed_something = 0;
|
||||
|
@ -893,7 +903,7 @@ void module_put(struct module *module)
|
|||
EXPORT_SYMBOL(module_put);
|
||||
|
||||
#else /* !CONFIG_MODULE_UNLOAD */
|
||||
static void print_unload_info(struct seq_file *m, struct module *mod)
|
||||
static inline void print_unload_info(struct seq_file *m, struct module *mod)
|
||||
{
|
||||
/* We don't know the usage count, or what modules are using. */
|
||||
seq_printf(m, " - -");
|
||||
|
@ -1578,11 +1588,21 @@ static int simplify_symbols(Elf_Shdr *sechdrs,
|
|||
return ret;
|
||||
}
|
||||
|
||||
/* Additional bytes needed by arch in front of individual sections */
|
||||
unsigned int __weak arch_mod_section_prepend(struct module *mod,
|
||||
unsigned int section)
|
||||
{
|
||||
/* default implementation just returns zero */
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Update size with this section: return offset. */
|
||||
static long get_offset(unsigned int *size, Elf_Shdr *sechdr)
|
||||
static long get_offset(struct module *mod, unsigned int *size,
|
||||
Elf_Shdr *sechdr, unsigned int section)
|
||||
{
|
||||
long ret;
|
||||
|
||||
*size += arch_mod_section_prepend(mod, section);
|
||||
ret = ALIGN(*size, sechdr->sh_addralign ?: 1);
|
||||
*size = ret + sechdr->sh_size;
|
||||
return ret;
|
||||
|
@ -1622,7 +1642,7 @@ static void layout_sections(struct module *mod,
|
|||
|| strncmp(secstrings + s->sh_name,
|
||||
".init", 5) == 0)
|
||||
continue;
|
||||
s->sh_entsize = get_offset(&mod->core_size, s);
|
||||
s->sh_entsize = get_offset(mod, &mod->core_size, s, i);
|
||||
DEBUGP("\t%s\n", secstrings + s->sh_name);
|
||||
}
|
||||
if (m == 0)
|
||||
|
@ -1640,7 +1660,7 @@ static void layout_sections(struct module *mod,
|
|||
|| strncmp(secstrings + s->sh_name,
|
||||
".init", 5) != 0)
|
||||
continue;
|
||||
s->sh_entsize = (get_offset(&mod->init_size, s)
|
||||
s->sh_entsize = (get_offset(mod, &mod->init_size, s, i)
|
||||
| INIT_OFFSET_MASK);
|
||||
DEBUGP("\t%s\n", secstrings + s->sh_name);
|
||||
}
|
||||
|
@ -1725,15 +1745,15 @@ static const struct kernel_symbol *lookup_symbol(const char *name,
|
|||
return NULL;
|
||||
}
|
||||
|
||||
static int is_exported(const char *name, const struct module *mod)
|
||||
static int is_exported(const char *name, unsigned long value,
|
||||
const struct module *mod)
|
||||
{
|
||||
if (!mod && lookup_symbol(name, __start___ksymtab, __stop___ksymtab))
|
||||
return 1;
|
||||
const struct kernel_symbol *ks;
|
||||
if (!mod)
|
||||
ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab);
|
||||
else
|
||||
if (mod && lookup_symbol(name, mod->syms, mod->syms + mod->num_syms))
|
||||
return 1;
|
||||
else
|
||||
return 0;
|
||||
ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms);
|
||||
return ks != NULL && ks->value == value;
|
||||
}
|
||||
|
||||
/* As per nm */
|
||||
|
@ -1865,6 +1885,13 @@ static noinline struct module *load_module(void __user *umod,
|
|||
/* vmalloc barfs on "unusual" numbers. Check here */
|
||||
if (len > 64 * 1024 * 1024 || (hdr = vmalloc(len)) == NULL)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
/* Create stop_machine threads since the error path relies on
|
||||
* a non-failing stop_machine call. */
|
||||
err = stop_machine_create();
|
||||
if (err)
|
||||
goto free_hdr;
|
||||
|
||||
if (copy_from_user(hdr, umod, len) != 0) {
|
||||
err = -EFAULT;
|
||||
goto free_hdr;
|
||||
|
@ -2248,6 +2275,7 @@ static noinline struct module *load_module(void __user *umod,
|
|||
/* Get rid of temporary copy */
|
||||
vfree(hdr);
|
||||
|
||||
stop_machine_destroy();
|
||||
/* Done! */
|
||||
return mod;
|
||||
|
||||
|
@ -2270,6 +2298,7 @@ static noinline struct module *load_module(void __user *umod,
|
|||
kfree(args);
|
||||
free_hdr:
|
||||
vfree(hdr);
|
||||
stop_machine_destroy();
|
||||
return ERR_PTR(err);
|
||||
|
||||
truncated:
|
||||
|
@ -2504,7 +2533,7 @@ int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
|
|||
strlcpy(name, mod->strtab + mod->symtab[symnum].st_name,
|
||||
KSYM_NAME_LEN);
|
||||
strlcpy(module_name, mod->name, MODULE_NAME_LEN);
|
||||
*exported = is_exported(name, mod);
|
||||
*exported = is_exported(name, *value, mod);
|
||||
preempt_enable();
|
||||
return 0;
|
||||
}
|
||||
|
|
|
@ -38,7 +38,10 @@ struct stop_machine_data {
|
|||
static unsigned int num_threads;
|
||||
static atomic_t thread_ack;
|
||||
static DEFINE_MUTEX(lock);
|
||||
|
||||
/* setup_lock protects refcount, stop_machine_wq and stop_machine_work. */
|
||||
static DEFINE_MUTEX(setup_lock);
|
||||
/* Users of stop_machine. */
|
||||
static int refcount;
|
||||
static struct workqueue_struct *stop_machine_wq;
|
||||
static struct stop_machine_data active, idle;
|
||||
static const cpumask_t *active_cpus;
|
||||
|
@ -109,6 +112,43 @@ static int chill(void *unused)
|
|||
return 0;
|
||||
}
|
||||
|
||||
int stop_machine_create(void)
|
||||
{
|
||||
mutex_lock(&setup_lock);
|
||||
if (refcount)
|
||||
goto done;
|
||||
stop_machine_wq = create_rt_workqueue("kstop");
|
||||
if (!stop_machine_wq)
|
||||
goto err_out;
|
||||
stop_machine_work = alloc_percpu(struct work_struct);
|
||||
if (!stop_machine_work)
|
||||
goto err_out;
|
||||
done:
|
||||
refcount++;
|
||||
mutex_unlock(&setup_lock);
|
||||
return 0;
|
||||
|
||||
err_out:
|
||||
if (stop_machine_wq)
|
||||
destroy_workqueue(stop_machine_wq);
|
||||
mutex_unlock(&setup_lock);
|
||||
return -ENOMEM;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(stop_machine_create);
|
||||
|
||||
void stop_machine_destroy(void)
|
||||
{
|
||||
mutex_lock(&setup_lock);
|
||||
refcount--;
|
||||
if (refcount)
|
||||
goto done;
|
||||
destroy_workqueue(stop_machine_wq);
|
||||
free_percpu(stop_machine_work);
|
||||
done:
|
||||
mutex_unlock(&setup_lock);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(stop_machine_destroy);
|
||||
|
||||
int __stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus)
|
||||
{
|
||||
struct work_struct *sm_work;
|
||||
|
@ -146,19 +186,14 @@ int stop_machine(int (*fn)(void *), void *data, const struct cpumask *cpus)
|
|||
{
|
||||
int ret;
|
||||
|
||||
ret = stop_machine_create();
|
||||
if (ret)
|
||||
return ret;
|
||||
/* No CPUs can come up or down during this. */
|
||||
get_online_cpus();
|
||||
ret = __stop_machine(fn, data, cpus);
|
||||
put_online_cpus();
|
||||
|
||||
stop_machine_destroy();
|
||||
return ret;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(stop_machine);
|
||||
|
||||
static int __init stop_machine_init(void)
|
||||
{
|
||||
stop_machine_wq = create_rt_workqueue("kstop");
|
||||
stop_machine_work = alloc_percpu(struct work_struct);
|
||||
return 0;
|
||||
}
|
||||
core_initcall(stop_machine_init);
|
||||
|
|
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