Archipelago » qemu

/*

 * QEMU dump

 *

 * Copyright Fujitsu, Corp. 2011, 2012

 *

 * Authors:

 *     Wen Congyang <wency@cn.fujitsu.com>

 *

 * This work is licensed under the terms of the GNU GPL, version 2 or later.

 * See the COPYING file in the top-level directory.

 *

 */

#include "qemu-common.h"

#include "elf.h"

#include "cpu.h"

#include "exec/cpu-all.h"

#include "exec/hwaddr.h"

#include "monitor/monitor.h"

#include "sysemu/kvm.h"

#include "sysemu/dump.h"

#include "sysemu/sysemu.h"

#include "sysemu/memory_mapping.h"

#include "sysemu/cpus.h"

#include "qapi/error.h"

#include "qmp-commands.h"

#include <zlib.h>

#ifdef CONFIG_LZO

#include <lzo/lzo1x.h>

#endif

#ifdef CONFIG_SNAPPY

#include <snappy-c.h>

#endif

#ifndef ELF_MACHINE_UNAME

#define ELF_MACHINE_UNAME "Unknown"

#endif

static uint16_t cpu_convert_to_target16(uint16_t val, int endian)

{

    if (endian == ELFDATA2LSB) {

        val = cpu_to_le16(val);

    } else {

        val = cpu_to_be16(val);

    }

    return val;

}

static uint32_t cpu_convert_to_target32(uint32_t val, int endian)

{

    if (endian == ELFDATA2LSB) {

        val = cpu_to_le32(val);

    } else {

        val = cpu_to_be32(val);

    }

    return val;

}

static uint64_t cpu_convert_to_target64(uint64_t val, int endian)

{

    if (endian == ELFDATA2LSB) {

        val = cpu_to_le64(val);

    } else {

        val = cpu_to_be64(val);

    }

    return val;

}

typedef struct DumpState {

    GuestPhysBlockList guest_phys_blocks;

    ArchDumpInfo dump_info;

    MemoryMappingList list;

    uint16_t phdr_num;

    uint32_t sh_info;

    bool have_section;

    bool resume;

    ssize_t note_size;

    hwaddr memory_offset;

    int fd;

    GuestPhysBlock *next_block;

    ram_addr_t start;

    bool has_filter;

    int64_t begin;

    int64_t length;

    Error **errp;

    uint8_t *note_buf;          /* buffer for notes */

    size_t note_buf_offset;     /* the writing place in note_buf */

    uint32_t nr_cpus;           /* number of guest's cpu */

    size_t page_size;           /* guest's page size */

    uint32_t page_shift;        /* guest's page shift */

    uint64_t max_mapnr;         /* the biggest guest's phys-mem's number */

    size_t len_dump_bitmap;     /* the size of the place used to store

                                   dump_bitmap in vmcore */

    off_t offset_dump_bitmap;   /* offset of dump_bitmap part in vmcore */

    off_t offset_page;          /* offset of page part in vmcore */

    size_t num_dumpable;        /* number of page that can be dumped */

    uint32_t flag_compress;     /* indicate the compression format */

} DumpState;

static int dump_cleanup(DumpState *s)

{

    int ret = 0;

    guest_phys_blocks_free(&s->guest_phys_blocks);

    memory_mapping_list_free(&s->list);

    if (s->fd != -1) {

        close(s->fd);

    }

    if (s->resume) {

        vm_start();

    }

    return ret;

}

static void dump_error(DumpState *s, const char *reason)

{

    dump_cleanup(s);

}

static int fd_write_vmcore(const void *buf, size_t size, void *opaque)

{

    DumpState *s = opaque;

    size_t written_size;

    written_size = qemu_write_full(s->fd, buf, size);

    if (written_size != size) {

        return -1;

    }

    return 0;

}

static int write_elf64_header(DumpState *s)

{

    Elf64_Ehdr elf_header;

    int ret;

    int endian = s->dump_info.d_endian;

    memset(&elf_header, 0, sizeof(Elf64_Ehdr));

    memcpy(&elf_header, ELFMAG, SELFMAG);

    elf_header.e_ident[EI_CLASS] = ELFCLASS64;

    elf_header.e_ident[EI_DATA] = s->dump_info.d_endian;

    elf_header.e_ident[EI_VERSION] = EV_CURRENT;

    elf_header.e_type = cpu_convert_to_target16(ET_CORE, endian);

    elf_header.e_machine = cpu_convert_to_target16(s->dump_info.d_machine,

                                                   endian);

    elf_header.e_version = cpu_convert_to_target32(EV_CURRENT, endian);

    elf_header.e_ehsize = cpu_convert_to_target16(sizeof(elf_header), endian);

    elf_header.e_phoff = cpu_convert_to_target64(sizeof(Elf64_Ehdr), endian);

    elf_header.e_phentsize = cpu_convert_to_target16(sizeof(Elf64_Phdr),

                                                     endian);

    elf_header.e_phnum = cpu_convert_to_target16(s->phdr_num, endian);

    if (s->have_section) {

        uint64_t shoff = sizeof(Elf64_Ehdr) + sizeof(Elf64_Phdr) * s->sh_info;

        elf_header.e_shoff = cpu_convert_to_target64(shoff, endian);

        elf_header.e_shentsize = cpu_convert_to_target16(sizeof(Elf64_Shdr),

                                                         endian);

        elf_header.e_shnum = cpu_convert_to_target16(1, endian);

    }

    ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);

    if (ret < 0) {

        dump_error(s, "dump: failed to write elf header.\n");

        return -1;

    }

    return 0;

}

static int write_elf32_header(DumpState *s)

{

    Elf32_Ehdr elf_header;

    int ret;

    int endian = s->dump_info.d_endian;

    memset(&elf_header, 0, sizeof(Elf32_Ehdr));

    memcpy(&elf_header, ELFMAG, SELFMAG);

    elf_header.e_ident[EI_CLASS] = ELFCLASS32;

    elf_header.e_ident[EI_DATA] = endian;

    elf_header.e_ident[EI_VERSION] = EV_CURRENT;

    elf_header.e_type = cpu_convert_to_target16(ET_CORE, endian);

    elf_header.e_machine = cpu_convert_to_target16(s->dump_info.d_machine,

                                                   endian);

    elf_header.e_version = cpu_convert_to_target32(EV_CURRENT, endian);

    elf_header.e_ehsize = cpu_convert_to_target16(sizeof(elf_header), endian);

    elf_header.e_phoff = cpu_convert_to_target32(sizeof(Elf32_Ehdr), endian);

    elf_header.e_phentsize = cpu_convert_to_target16(sizeof(Elf32_Phdr),

                                                     endian);

    elf_header.e_phnum = cpu_convert_to_target16(s->phdr_num, endian);

    if (s->have_section) {

        uint32_t shoff = sizeof(Elf32_Ehdr) + sizeof(Elf32_Phdr) * s->sh_info;

        elf_header.e_shoff = cpu_convert_to_target32(shoff, endian);

        elf_header.e_shentsize = cpu_convert_to_target16(sizeof(Elf32_Shdr),

                                                         endian);

        elf_header.e_shnum = cpu_convert_to_target16(1, endian);

    }

    ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);

    if (ret < 0) {

        dump_error(s, "dump: failed to write elf header.\n");

        return -1;

    }

    return 0;

}

static int write_elf64_load(DumpState *s, MemoryMapping *memory_mapping,

                            int phdr_index, hwaddr offset,

                            hwaddr filesz)

{

    Elf64_Phdr phdr;

    int ret;

    int endian = s->dump_info.d_endian;

    memset(&phdr, 0, sizeof(Elf64_Phdr));

    phdr.p_type = cpu_convert_to_target32(PT_LOAD, endian);

    phdr.p_offset = cpu_convert_to_target64(offset, endian);

    phdr.p_paddr = cpu_convert_to_target64(memory_mapping->phys_addr, endian);

    phdr.p_filesz = cpu_convert_to_target64(filesz, endian);

    phdr.p_memsz = cpu_convert_to_target64(memory_mapping->length, endian);

    phdr.p_vaddr = cpu_convert_to_target64(memory_mapping->virt_addr, endian);

    assert(memory_mapping->length >= filesz);

    ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s);

    if (ret < 0) {

        dump_error(s, "dump: failed to write program header table.\n");

        return -1;

    }

    return 0;

}

static int write_elf32_load(DumpState *s, MemoryMapping *memory_mapping,

                            int phdr_index, hwaddr offset,

                            hwaddr filesz)

{

    Elf32_Phdr phdr;

    int ret;

    int endian = s->dump_info.d_endian;

    memset(&phdr, 0, sizeof(Elf32_Phdr));

    phdr.p_type = cpu_convert_to_target32(PT_LOAD, endian);

    phdr.p_offset = cpu_convert_to_target32(offset, endian);

    phdr.p_paddr = cpu_convert_to_target32(memory_mapping->phys_addr, endian);

    phdr.p_filesz = cpu_convert_to_target32(filesz, endian);

    phdr.p_memsz = cpu_convert_to_target32(memory_mapping->length, endian);

    phdr.p_vaddr = cpu_convert_to_target32(memory_mapping->virt_addr, endian);

    assert(memory_mapping->length >= filesz);

    ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s);

    if (ret < 0) {

        dump_error(s, "dump: failed to write program header table.\n");

        return -1;

    }

    return 0;

}

static int write_elf64_note(DumpState *s)

{

    Elf64_Phdr phdr;

    int endian = s->dump_info.d_endian;

    hwaddr begin = s->memory_offset - s->note_size;

    int ret;

    memset(&phdr, 0, sizeof(Elf64_Phdr));

    phdr.p_type = cpu_convert_to_target32(PT_NOTE, endian);

    phdr.p_offset = cpu_convert_to_target64(begin, endian);

    phdr.p_paddr = 0;

    phdr.p_filesz = cpu_convert_to_target64(s->note_size, endian);

    phdr.p_memsz = cpu_convert_to_target64(s->note_size, endian);

    phdr.p_vaddr = 0;

    ret = fd_write_vmcore(&phdr, sizeof(Elf64_Phdr), s);

    if (ret < 0) {

        dump_error(s, "dump: failed to write program header table.\n");

        return -1;

    }

    return 0;

}

static inline int cpu_index(CPUState *cpu)

{

    return cpu->cpu_index + 1;

}

static int write_elf64_notes(WriteCoreDumpFunction f, DumpState *s)

{

    CPUState *cpu;

    int ret;

    int id;

    CPU_FOREACH(cpu) {

        id = cpu_index(cpu);

        ret = cpu_write_elf64_note(f, cpu, id, s);

        if (ret < 0) {

            dump_error(s, "dump: failed to write elf notes.\n");

            return -1;

        }

    }

    CPU_FOREACH(cpu) {

        ret = cpu_write_elf64_qemunote(f, cpu, s);

        if (ret < 0) {

            dump_error(s, "dump: failed to write CPU status.\n");

            return -1;

        }

    }

    return 0;

}

static int write_elf32_note(DumpState *s)

{

    hwaddr begin = s->memory_offset - s->note_size;

    Elf32_Phdr phdr;

    int endian = s->dump_info.d_endian;

    int ret;

    memset(&phdr, 0, sizeof(Elf32_Phdr));

    phdr.p_type = cpu_convert_to_target32(PT_NOTE, endian);

    phdr.p_offset = cpu_convert_to_target32(begin, endian);

    phdr.p_paddr = 0;

    phdr.p_filesz = cpu_convert_to_target32(s->note_size, endian);

    phdr.p_memsz = cpu_convert_to_target32(s->note_size, endian);

    phdr.p_vaddr = 0;

    ret = fd_write_vmcore(&phdr, sizeof(Elf32_Phdr), s);

    if (ret < 0) {

        dump_error(s, "dump: failed to write program header table.\n");

        return -1;

    }

    return 0;

}

static int write_elf32_notes(WriteCoreDumpFunction f, DumpState *s)

{

    CPUState *cpu;

    int ret;

    int id;

    CPU_FOREACH(cpu) {

        id = cpu_index(cpu);

        ret = cpu_write_elf32_note(f, cpu, id, s);

        if (ret < 0) {

            dump_error(s, "dump: failed to write elf notes.\n");

            return -1;

        }

    }

    CPU_FOREACH(cpu) {

        ret = cpu_write_elf32_qemunote(f, cpu, s);

        if (ret < 0) {

            dump_error(s, "dump: failed to write CPU status.\n");

            return -1;

        }

    }

    return 0;

}

static int write_elf_section(DumpState *s, int type)

{

    Elf32_Shdr shdr32;

    Elf64_Shdr shdr64;

    int endian = s->dump_info.d_endian;

    int shdr_size;

    void *shdr;

    int ret;

    if (type == 0) {

        shdr_size = sizeof(Elf32_Shdr);

        memset(&shdr32, 0, shdr_size);

        shdr32.sh_info = cpu_convert_to_target32(s->sh_info, endian);

        shdr = &shdr32;

    } else {

        shdr_size = sizeof(Elf64_Shdr);

        memset(&shdr64, 0, shdr_size);

        shdr64.sh_info = cpu_convert_to_target32(s->sh_info, endian);

        shdr = &shdr64;

    }

    ret = fd_write_vmcore(&shdr, shdr_size, s);

    if (ret < 0) {

        dump_error(s, "dump: failed to write section header table.\n");

        return -1;

    }

    return 0;

}

static int write_data(DumpState *s, void *buf, int length)

{

    int ret;

    ret = fd_write_vmcore(buf, length, s);

    if (ret < 0) {

        dump_error(s, "dump: failed to save memory.\n");

        return -1;

    }

    return 0;

}

/* write the memroy to vmcore. 1 page per I/O. */

static int write_memory(DumpState *s, GuestPhysBlock *block, ram_addr_t start,

                        int64_t size)

{

    int64_t i;

    int ret;

    for (i = 0; i < size / TARGET_PAGE_SIZE; i++) {

        ret = write_data(s, block->host_addr + start + i * TARGET_PAGE_SIZE,

                         TARGET_PAGE_SIZE);

        if (ret < 0) {

            return ret;

        }

    }

    if ((size % TARGET_PAGE_SIZE) != 0) {

        ret = write_data(s, block->host_addr + start + i * TARGET_PAGE_SIZE,

                         size % TARGET_PAGE_SIZE);

        if (ret < 0) {

            return ret;

        }

    }

    return 0;

}

/* get the memory's offset and size in the vmcore */

static void get_offset_range(hwaddr phys_addr,

                             ram_addr_t mapping_length,

                             DumpState *s,

                             hwaddr *p_offset,

                             hwaddr *p_filesz)

{

    GuestPhysBlock *block;

    hwaddr offset = s->memory_offset;

    int64_t size_in_block, start;

    /* When the memory is not stored into vmcore, offset will be -1 */

    *p_offset = -1;

    *p_filesz = 0;

    if (s->has_filter) {

        if (phys_addr < s->begin || phys_addr >= s->begin + s->length) {

            return;

        }

    }

    QTAILQ_FOREACH(block, &s->guest_phys_blocks.head, next) {

        if (s->has_filter) {

            if (block->target_start >= s->begin + s->length ||

                block->target_end <= s->begin) {

                /* This block is out of the range */

                continue;

            }

            if (s->begin <= block->target_start) {

                start = block->target_start;

            } else {

                start = s->begin;

            }

            size_in_block = block->target_end - start;

            if (s->begin + s->length < block->target_end) {

                size_in_block -= block->target_end - (s->begin + s->length);

            }

        } else {

            start = block->target_start;

            size_in_block = block->target_end - block->target_start;

        }

        if (phys_addr >= start && phys_addr < start + size_in_block) {

            *p_offset = phys_addr - start + offset;

            /* The offset range mapped from the vmcore file must not spill over

             * the GuestPhysBlock, clamp it. The rest of the mapping will be

             * zero-filled in memory at load time; see

             * <http://refspecs.linuxbase.org/elf/gabi4+/ch5.pheader.html>.

             */

            *p_filesz = phys_addr + mapping_length <= start + size_in_block ?

                        mapping_length :

                        size_in_block - (phys_addr - start);

            return;

        }

        offset += size_in_block;

    }

}

static int write_elf_loads(DumpState *s)

{

    hwaddr offset, filesz;

    MemoryMapping *memory_mapping;

    uint32_t phdr_index = 1;

    int ret;

    uint32_t max_index;

    if (s->have_section) {

        max_index = s->sh_info;

    } else {

        max_index = s->phdr_num;

    }

    QTAILQ_FOREACH(memory_mapping, &s->list.head, next) {

        get_offset_range(memory_mapping->phys_addr,

                         memory_mapping->length,

                         s, &offset, &filesz);

        if (s->dump_info.d_class == ELFCLASS64) {

            ret = write_elf64_load(s, memory_mapping, phdr_index++, offset,

                                   filesz);

        } else {

            ret = write_elf32_load(s, memory_mapping, phdr_index++, offset,

                                   filesz);

        }

        if (ret < 0) {

            return -1;

        }

        if (phdr_index >= max_index) {

            break;

        }

    }

    return 0;

}

/* write elf header, PT_NOTE and elf note to vmcore. */

static int dump_begin(DumpState *s)

{

    int ret;

    /*

     * the vmcore's format is:

     *   --------------

     *   |  elf header |

     *   --------------

     *   |  PT_NOTE    |

     *   --------------

     *   |  PT_LOAD    |

     *   --------------

     *   |  ......     |

     *   --------------

     *   |  PT_LOAD    |

     *   --------------

     *   |  sec_hdr    |

     *   --------------

     *   |  elf note   |

     *   --------------

     *   |  memory     |

     *   --------------

     *

     * we only know where the memory is saved after we write elf note into

     * vmcore.

     */

    /* write elf header to vmcore */

    if (s->dump_info.d_class == ELFCLASS64) {

        ret = write_elf64_header(s);

    } else {

        ret = write_elf32_header(s);

    }

    if (ret < 0) {

        return -1;

    }

    if (s->dump_info.d_class == ELFCLASS64) {

        /* write PT_NOTE to vmcore */

        if (write_elf64_note(s) < 0) {

            return -1;

        }

        /* write all PT_LOAD to vmcore */

        if (write_elf_loads(s) < 0) {

            return -1;

        }

        /* write section to vmcore */

        if (s->have_section) {

            if (write_elf_section(s, 1) < 0) {

                return -1;

            }

        }

        /* write notes to vmcore */

        if (write_elf64_notes(fd_write_vmcore, s) < 0) {

            return -1;

        }

    } else {

        /* write PT_NOTE to vmcore */

        if (write_elf32_note(s) < 0) {

            return -1;

        }

        /* write all PT_LOAD to vmcore */

        if (write_elf_loads(s) < 0) {

            return -1;

        }

        /* write section to vmcore */

        if (s->have_section) {

            if (write_elf_section(s, 0) < 0) {

                return -1;

            }

        }

        /* write notes to vmcore */

        if (write_elf32_notes(fd_write_vmcore, s) < 0) {

            return -1;

        }

    }

    return 0;

}

/* write PT_LOAD to vmcore */

static int dump_completed(DumpState *s)

{

    dump_cleanup(s);

    return 0;

}

static int get_next_block(DumpState *s, GuestPhysBlock *block)

{

    while (1) {

        block = QTAILQ_NEXT(block, next);

        if (!block) {

            /* no more block */

            return 1;

        }

        s->start = 0;

        s->next_block = block;

        if (s->has_filter) {

            if (block->target_start >= s->begin + s->length ||

                block->target_end <= s->begin) {

                /* This block is out of the range */

                continue;

            }

            if (s->begin > block->target_start) {

                s->start = s->begin - block->target_start;

            }

        }

        return 0;

    }

}

/* write all memory to vmcore */

static int dump_iterate(DumpState *s)

{

    GuestPhysBlock *block;

    int64_t size;

    int ret;

    while (1) {

        block = s->next_block;

        size = block->target_end - block->target_start;

        if (s->has_filter) {

            size -= s->start;

            if (s->begin + s->length < block->target_end) {

                size -= block->target_end - (s->begin + s->length);

            }

        }

        ret = write_memory(s, block, s->start, size);

        if (ret == -1) {

            return ret;

        }

        ret = get_next_block(s, block);

        if (ret == 1) {

            dump_completed(s);

            return 0;

        }

    }

}

static int create_vmcore(DumpState *s)

{

    int ret;

    ret = dump_begin(s);

    if (ret < 0) {

        return -1;

    }

    ret = dump_iterate(s);

    if (ret < 0) {

        return -1;

    }

    return 0;

}

static int write_start_flat_header(int fd)

{

    uint8_t *buf;

    MakedumpfileHeader mh;

    int ret = 0;

    memset(&mh, 0, sizeof(mh));

    strncpy(mh.signature, MAKEDUMPFILE_SIGNATURE,

            strlen(MAKEDUMPFILE_SIGNATURE));

    mh.type = cpu_to_be64(TYPE_FLAT_HEADER);

    mh.version = cpu_to_be64(VERSION_FLAT_HEADER);

    buf = g_malloc0(MAX_SIZE_MDF_HEADER);

    memcpy(buf, &mh, sizeof(mh));

    size_t written_size;

    written_size = qemu_write_full(fd, buf, MAX_SIZE_MDF_HEADER);

    if (written_size != MAX_SIZE_MDF_HEADER) {

        ret = -1;

    }

    g_free(buf);

    return ret;

}

static int write_end_flat_header(int fd)

{

    MakedumpfileDataHeader mdh;

    mdh.offset = END_FLAG_FLAT_HEADER;

    mdh.buf_size = END_FLAG_FLAT_HEADER;

    size_t written_size;

    written_size = qemu_write_full(fd, &mdh, sizeof(mdh));

    if (written_size != sizeof(mdh)) {

        return -1;

    }

    return 0;

}

static int write_buffer(int fd, off_t offset, const void *buf, size_t size)

{

    size_t written_size;

    MakedumpfileDataHeader mdh;

    mdh.offset = cpu_to_be64(offset);

    mdh.buf_size = cpu_to_be64(size);

    written_size = qemu_write_full(fd, &mdh, sizeof(mdh));

    if (written_size != sizeof(mdh)) {

        return -1;

    }

    written_size = qemu_write_full(fd, buf, size);

    if (written_size != size) {

        return -1;

    }

    return 0;

}

static int buf_write_note(const void *buf, size_t size, void *opaque)

{

    DumpState *s = opaque;

    /* note_buf is not enough */

    if (s->note_buf_offset + size > s->note_size) {

        return -1;

    }

    memcpy(s->note_buf + s->note_buf_offset, buf, size);

    s->note_buf_offset += size;

    return 0;

}

/* write common header, sub header and elf note to vmcore */

static int create_header32(DumpState *s)

{

    int ret = 0;

    DiskDumpHeader32 *dh = NULL;

    KdumpSubHeader32 *kh = NULL;

    size_t size;

    int endian = s->dump_info.d_endian;

    uint32_t block_size;

    uint32_t sub_hdr_size;

    uint32_t bitmap_blocks;

    uint32_t status = 0;

    uint64_t offset_note;

    /* write common header, the version of kdump-compressed format is 6th */

    size = sizeof(DiskDumpHeader32);

    dh = g_malloc0(size);

    strncpy(dh->signature, KDUMP_SIGNATURE, strlen(KDUMP_SIGNATURE));

    dh->header_version = cpu_convert_to_target32(6, endian);

    block_size = s->page_size;

    dh->block_size = cpu_convert_to_target32(block_size, endian);

    sub_hdr_size = sizeof(struct KdumpSubHeader32) + s->note_size;

    sub_hdr_size = DIV_ROUND_UP(sub_hdr_size, block_size);

    dh->sub_hdr_size = cpu_convert_to_target32(sub_hdr_size, endian);

    /* dh->max_mapnr may be truncated, full 64bit is in kh.max_mapnr_64 */

    dh->max_mapnr = cpu_convert_to_target32(MIN(s->max_mapnr, UINT_MAX),

                                            endian);

    dh->nr_cpus = cpu_convert_to_target32(s->nr_cpus, endian);

    bitmap_blocks = DIV_ROUND_UP(s->len_dump_bitmap, block_size) * 2;

    dh->bitmap_blocks = cpu_convert_to_target32(bitmap_blocks, endian);

    strncpy(dh->utsname.machine, ELF_MACHINE_UNAME, sizeof(dh->utsname.machine));

    if (s->flag_compress & DUMP_DH_COMPRESSED_ZLIB) {

        status |= DUMP_DH_COMPRESSED_ZLIB;

    }

#ifdef CONFIG_LZO

    if (s->flag_compress & DUMP_DH_COMPRESSED_LZO) {

        status |= DUMP_DH_COMPRESSED_LZO;

    }

#endif

#ifdef CONFIG_SNAPPY

    if (s->flag_compress & DUMP_DH_COMPRESSED_SNAPPY) {

        status |= DUMP_DH_COMPRESSED_SNAPPY;

    }

#endif

    dh->status = cpu_convert_to_target32(status, endian);

    if (write_buffer(s->fd, 0, dh, size) < 0) {

        dump_error(s, "dump: failed to write disk dump header.\n");

        ret = -1;

        goto out;

    }

    /* write sub header */

    size = sizeof(KdumpSubHeader32);

    kh = g_malloc0(size);

    /* 64bit max_mapnr_64 */

    kh->max_mapnr_64 = cpu_convert_to_target64(s->max_mapnr, endian);

    kh->phys_base = cpu_convert_to_target32(PHYS_BASE, endian);

    kh->dump_level = cpu_convert_to_target32(DUMP_LEVEL, endian);

    offset_note = DISKDUMP_HEADER_BLOCKS * block_size + size;

    kh->offset_note = cpu_convert_to_target64(offset_note, endian);

    kh->note_size = cpu_convert_to_target32(s->note_size, endian);

    if (write_buffer(s->fd, DISKDUMP_HEADER_BLOCKS *

                     block_size, kh, size) < 0) {

        dump_error(s, "dump: failed to write kdump sub header.\n");

        ret = -1;

        goto out;

    }

    /* write note */

    s->note_buf = g_malloc0(s->note_size);

    s->note_buf_offset = 0;

    /* use s->note_buf to store notes temporarily */

    if (write_elf32_notes(buf_write_note, s) < 0) {

        ret = -1;

        goto out;

    }

    if (write_buffer(s->fd, offset_note, s->note_buf,

                     s->note_size) < 0) {

        dump_error(s, "dump: failed to write notes");

        ret = -1;

        goto out;

    }

    /* get offset of dump_bitmap */

    s->offset_dump_bitmap = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size) *

                             block_size;

    /* get offset of page */

    s->offset_page = (DISKDUMP_HEADER_BLOCKS + sub_hdr_size + bitmap_blocks) *

                     block_size;

out:

    g_free(dh);

    g_free(kh);

    g_free(s->note_buf);

    return ret;

}

/* write common header, sub header and elf note to vmcore */

static int create_header64(DumpState *s)

{

    int ret = 0;

    DiskDumpHeader64 *dh = NULL;

    KdumpSubHeader64 *kh = NULL;

    size_t size;

    int endian = s->dump_info.d_endian;

    uint32_t block_size;

    uint32_t sub_hdr_size;

    uint32_t bitmap_blocks;

    uint32_t status = 0;

    uint64_t offset_note;