kexec_file, x86: move re-factored code to generic side
In the previous patches, commonly-used routines, exclude_mem_range() and prepare_elf64_headers(), were carved out. Now place them in kexec common code. A prefix "crash_" is given to each of their names to avoid possible name collisions. Link: http://lkml.kernel.org/r/20180306102303.9063-8-takahiro.akashi@linaro.org Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Acked-by: Dave Young <dyoung@redhat.com> Tested-by: Dave Young <dyoung@redhat.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: Baoquan He <bhe@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
AKASHI Takahiro
committed by
Linus Torvalds
Linus Torvalds
parent
eb7dae947e
commit
babac4a84a
@ -22,6 +22,11 @@
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#include <linux/ima.h>
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#include <crypto/hash.h>
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#include <crypto/sha.h>
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#include <linux/elf.h>
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#include <linux/elfcore.h>
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#include <linux/kernel.h>
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#include <linux/kexec.h>
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#include <linux/slab.h>
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#include <linux/syscalls.h>
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#include <linux/vmalloc.h>
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#include "kexec_internal.h"
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@ -1079,3 +1084,173 @@ int kexec_purgatory_get_set_symbol(struct kimage *image, const char *name,
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return 0;
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}
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#endif /* CONFIG_ARCH_HAS_KEXEC_PURGATORY */
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int crash_exclude_mem_range(struct crash_mem *mem,
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unsigned long long mstart, unsigned long long mend)
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{
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int i, j;
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unsigned long long start, end;
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struct crash_mem_range temp_range = {0, 0};
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for (i = 0; i < mem->nr_ranges; i++) {
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start = mem->ranges[i].start;
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end = mem->ranges[i].end;
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if (mstart > end || mend < start)
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continue;
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/* Truncate any area outside of range */
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if (mstart < start)
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mstart = start;
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if (mend > end)
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mend = end;
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/* Found completely overlapping range */
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if (mstart == start && mend == end) {
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mem->ranges[i].start = 0;
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mem->ranges[i].end = 0;
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if (i < mem->nr_ranges - 1) {
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/* Shift rest of the ranges to left */
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for (j = i; j < mem->nr_ranges - 1; j++) {
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mem->ranges[j].start =
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mem->ranges[j+1].start;
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mem->ranges[j].end =
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mem->ranges[j+1].end;
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}
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}
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mem->nr_ranges--;
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return 0;
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}
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if (mstart > start && mend < end) {
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/* Split original range */
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mem->ranges[i].end = mstart - 1;
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temp_range.start = mend + 1;
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temp_range.end = end;
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} else if (mstart != start)
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mem->ranges[i].end = mstart - 1;
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else
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mem->ranges[i].start = mend + 1;
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break;
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}
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/* If a split happened, add the split to array */
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if (!temp_range.end)
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return 0;
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/* Split happened */
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if (i == mem->max_nr_ranges - 1)
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return -ENOMEM;
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/* Location where new range should go */
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j = i + 1;
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if (j < mem->nr_ranges) {
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/* Move over all ranges one slot towards the end */
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for (i = mem->nr_ranges - 1; i >= j; i--)
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mem->ranges[i + 1] = mem->ranges[i];
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}
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mem->ranges[j].start = temp_range.start;
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mem->ranges[j].end = temp_range.end;
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mem->nr_ranges++;
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return 0;
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}
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int crash_prepare_elf64_headers(struct crash_mem *mem, int kernel_map,
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void **addr, unsigned long *sz)
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{
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Elf64_Ehdr *ehdr;
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Elf64_Phdr *phdr;
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unsigned long nr_cpus = num_possible_cpus(), nr_phdr, elf_sz;
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unsigned char *buf;
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unsigned int cpu, i;
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unsigned long long notes_addr;
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unsigned long mstart, mend;
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/* extra phdr for vmcoreinfo elf note */
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nr_phdr = nr_cpus + 1;
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nr_phdr += mem->nr_ranges;
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/*
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* kexec-tools creates an extra PT_LOAD phdr for kernel text mapping
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* area (for example, ffffffff80000000 - ffffffffa0000000 on x86_64).
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* I think this is required by tools like gdb. So same physical
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* memory will be mapped in two elf headers. One will contain kernel
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* text virtual addresses and other will have __va(physical) addresses.
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*/
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nr_phdr++;
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elf_sz = sizeof(Elf64_Ehdr) + nr_phdr * sizeof(Elf64_Phdr);
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elf_sz = ALIGN(elf_sz, ELF_CORE_HEADER_ALIGN);
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buf = vzalloc(elf_sz);
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if (!buf)
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return -ENOMEM;
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ehdr = (Elf64_Ehdr *)buf;
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phdr = (Elf64_Phdr *)(ehdr + 1);
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memcpy(ehdr->e_ident, ELFMAG, SELFMAG);
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ehdr->e_ident[EI_CLASS] = ELFCLASS64;
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ehdr->e_ident[EI_DATA] = ELFDATA2LSB;
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ehdr->e_ident[EI_VERSION] = EV_CURRENT;
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ehdr->e_ident[EI_OSABI] = ELF_OSABI;
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memset(ehdr->e_ident + EI_PAD, 0, EI_NIDENT - EI_PAD);
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ehdr->e_type = ET_CORE;
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ehdr->e_machine = ELF_ARCH;
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ehdr->e_version = EV_CURRENT;
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ehdr->e_phoff = sizeof(Elf64_Ehdr);
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ehdr->e_ehsize = sizeof(Elf64_Ehdr);
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ehdr->e_phentsize = sizeof(Elf64_Phdr);
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/* Prepare one phdr of type PT_NOTE for each present cpu */
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for_each_present_cpu(cpu) {
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phdr->p_type = PT_NOTE;
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notes_addr = per_cpu_ptr_to_phys(per_cpu_ptr(crash_notes, cpu));
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phdr->p_offset = phdr->p_paddr = notes_addr;
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phdr->p_filesz = phdr->p_memsz = sizeof(note_buf_t);
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(ehdr->e_phnum)++;
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phdr++;
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}
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/* Prepare one PT_NOTE header for vmcoreinfo */
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phdr->p_type = PT_NOTE;
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phdr->p_offset = phdr->p_paddr = paddr_vmcoreinfo_note();
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phdr->p_filesz = phdr->p_memsz = VMCOREINFO_NOTE_SIZE;
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(ehdr->e_phnum)++;
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phdr++;
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/* Prepare PT_LOAD type program header for kernel text region */
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if (kernel_map) {
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phdr->p_type = PT_LOAD;
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phdr->p_flags = PF_R|PF_W|PF_X;
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phdr->p_vaddr = (Elf64_Addr)_text;
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phdr->p_filesz = phdr->p_memsz = _end - _text;
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phdr->p_offset = phdr->p_paddr = __pa_symbol(_text);
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ehdr->e_phnum++;
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phdr++;
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}
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/* Go through all the ranges in mem->ranges[] and prepare phdr */
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for (i = 0; i < mem->nr_ranges; i++) {
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mstart = mem->ranges[i].start;
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mend = mem->ranges[i].end;
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phdr->p_type = PT_LOAD;
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phdr->p_flags = PF_R|PF_W|PF_X;
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phdr->p_offset = mstart;
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phdr->p_paddr = mstart;
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phdr->p_vaddr = (unsigned long long) __va(mstart);
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phdr->p_filesz = phdr->p_memsz = mend - mstart + 1;
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phdr->p_align = 0;
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ehdr->e_phnum++;
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phdr++;
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pr_debug("Crash PT_LOAD elf header. phdr=%p vaddr=0x%llx, paddr=0x%llx, sz=0x%llx e_phnum=%d p_offset=0x%llx\n",
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phdr, phdr->p_vaddr, phdr->p_paddr, phdr->p_filesz,
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ehdr->e_phnum, phdr->p_offset);
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}
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*addr = buf;
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*sz = elf_sz;
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return 0;
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}
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