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(unknown [9.114.12.104]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 10 Mar 2022 11:16:29 +0000 (GMT) From: Janosch Frank To: qemu-devel@nongnu.org Subject: [PATCH 1/5] dump: Allocate header Date: Thu, 10 Mar 2022 11:16:04 +0000 Message-Id: <20220310111608.3362-2-frankja@linux.ibm.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220310111608.3362-1-frankja@linux.ibm.com> References: <20220310111608.3362-1-frankja@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: gslLjjUCrDBvCBRAYciMIhPF9ng3yYuj X-Proofpoint-GUID: 1pNZcH3hNWjcmyjB9DQ1Jo2di6jMAfy8 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-03-10_03,2022-03-09_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 bulkscore=0 malwarescore=0 mlxlogscore=999 priorityscore=1501 impostorscore=0 phishscore=0 clxscore=1015 spamscore=0 mlxscore=0 adultscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2202240000 definitions=main-2203100059 Received-SPF: pass client-ip=148.163.156.1; envelope-from=frankja@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: marcandre.lureau@redhat.com, mhartmay@linux.ibm.com, pbonzini@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Allocating the header lets us write it at a later time and hence also allows us to change section and segment table offsets until we finally write it. Signed-off-by: Janosch Frank --- dump/dump.c | 115 ++++++++++++++++++++++-------------------- include/sysemu/dump.h | 1 + 2 files changed, 62 insertions(+), 54 deletions(-) diff --git a/dump/dump.c b/dump/dump.c index ae8ec527de..88343d7486 100644 --- a/dump/dump.c +++ b/dump/dump.c @@ -99,6 +99,7 @@ static int dump_cleanup(DumpState *s) memory_mapping_list_free(&s->list); close(s->fd); g_free(s->guest_note); + g_free(s->elf_header); s->guest_note = NULL; if (s->resume) { if (s->detached) { @@ -127,63 +128,47 @@ static int fd_write_vmcore(const void *buf, size_t size, void *opaque) return 0; } -static void write_elf64_header(DumpState *s, Error **errp) +static void prepare_elf64_header(DumpState *s) { - uint16_t phnum = s->phdr_num >= PN_XNUM ? PN_XNUM : s->phdr_num; - Elf64_Ehdr elf_header; - int ret; + Elf64_Ehdr *elf_header = s->elf_header; - 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_to_dump16(s, ET_CORE); - elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine); - elf_header.e_version = cpu_to_dump32(s, EV_CURRENT); - elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header)); - elf_header.e_phoff = cpu_to_dump64(s, s->phdr_offset); - elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf64_Phdr)); - elf_header.e_phnum = cpu_to_dump16(s, phnum); + 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_to_dump16(s, ET_CORE); + elf_header->e_machine = cpu_to_dump16(s, s->dump_info.d_machine); + elf_header->e_version = cpu_to_dump32(s, EV_CURRENT); + elf_header->e_ehsize = cpu_to_dump16(s, sizeof(*elf_header)); + elf_header->e_phoff = cpu_to_dump64(s, s->phdr_offset); + elf_header->e_phentsize = cpu_to_dump16(s, sizeof(Elf64_Phdr)); + elf_header->e_phnum = cpu_to_dump16(s, s->phdr_num); if (s->shdr_num) { - elf_header.e_shoff = cpu_to_dump64(s, s->shdr_offset); - elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf64_Shdr)); - elf_header.e_shnum = cpu_to_dump16(s, s->shdr_num); - } - - ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s); - if (ret < 0) { - error_setg_errno(errp, -ret, "dump: failed to write elf header"); + elf_header->e_shoff = cpu_to_dump64(s, s->shdr_offset); + elf_header->e_shentsize = cpu_to_dump16(s, sizeof(Elf64_Shdr)); + elf_header->e_shnum = cpu_to_dump16(s, s->shdr_num); } } -static void write_elf32_header(DumpState *s, Error **errp) +static void prepare_elf32_header(DumpState *s) { - uint16_t phnum = s->phdr_num >= PN_XNUM ? PN_XNUM : s->phdr_num; - Elf32_Ehdr elf_header; - int ret; + Elf32_Ehdr *elf_header = s->elf_header; - 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] = s->dump_info.d_endian; - elf_header.e_ident[EI_VERSION] = EV_CURRENT; - elf_header.e_type = cpu_to_dump16(s, ET_CORE); - elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine); - elf_header.e_version = cpu_to_dump32(s, EV_CURRENT); - elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header)); - elf_header.e_phoff = cpu_to_dump32(s, s->phdr_offset); - elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf32_Phdr)); - elf_header.e_phnum = cpu_to_dump16(s, phnum); + memcpy(elf_header, ELFMAG, SELFMAG); + elf_header->e_ident[EI_CLASS] = ELFCLASS32; + elf_header->e_ident[EI_DATA] = s->dump_info.d_endian; + elf_header->e_ident[EI_VERSION] = EV_CURRENT; + elf_header->e_type = cpu_to_dump16(s, ET_CORE); + elf_header->e_machine = cpu_to_dump16(s, s->dump_info.d_machine); + elf_header->e_version = cpu_to_dump32(s, EV_CURRENT); + elf_header->e_ehsize = cpu_to_dump16(s, sizeof(*elf_header)); + elf_header->e_phoff = cpu_to_dump32(s, s->phdr_offset); + elf_header->e_phentsize = cpu_to_dump16(s, sizeof(Elf32_Phdr)); + elf_header->e_phnum = cpu_to_dump16(s, s->phdr_num); if (s->shdr_num) { - elf_header.e_shoff = cpu_to_dump32(s, s->shdr_offset); - elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf32_Shdr)); - elf_header.e_shnum = cpu_to_dump16(s, s->shdr_num); - } - - ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s); - if (ret < 0) { - error_setg_errno(errp, -ret, "dump: failed to write elf header"); + elf_header->e_shoff = cpu_to_dump32(s, s->shdr_offset); + elf_header->e_shentsize = cpu_to_dump16(s, sizeof(Elf32_Shdr)); + elf_header->e_shnum = cpu_to_dump16(s, s->shdr_num); } } @@ -524,6 +509,26 @@ static void write_elf_notes(DumpState *s, Error **errp) } } +static void prepare_elf_header(DumpState *s) +{ + if (dump_is_64bit(s)) { + prepare_elf64_header(s); + } else { + prepare_elf32_header(s); + } +} + +static void write_elf_header(DumpState *s, Error **errp) +{ + size_t size = dump_is_64bit(s) ? sizeof(Elf64_Ehdr) : sizeof(Elf32_Ehdr); + int ret; + + ret = fd_write_vmcore(s->elf_header, size, s); + if (ret < 0) { + error_setg_errno(errp, -ret, "dump: failed to write elf header"); + } +} + /* write elf header, PT_NOTE and elf note to vmcore. */ static void dump_begin(DumpState *s, Error **errp) { @@ -553,12 +558,11 @@ static void dump_begin(DumpState *s, Error **errp) * vmcore. */ - /* write elf header to vmcore */ - if (dump_is_64bit(s)) { - write_elf64_header(s, errp); - } else { - write_elf32_header(s, errp); - } + /* Write elf header to buffer */ + prepare_elf_header(s); + + /* Start to write stuff into files*/ + write_elf_header(s, errp); if (*errp) { return; } @@ -1683,6 +1687,9 @@ static void dump_init(DumpState *s, int fd, bool has_format, goto cleanup; } + s->elf_header = g_malloc0(dump_is_64bit(s) ? + sizeof(Elf64_Ehdr) : sizeof(Elf32_Ehdr)); + /* * The goal of this block is to (a) update the previously guessed * phys_base, (b) copy the guest note out of the guest. diff --git a/include/sysemu/dump.h b/include/sysemu/dump.h index ffc2ea1072..9c4a83156b 100644 --- a/include/sysemu/dump.h +++ b/include/sysemu/dump.h @@ -172,6 +172,7 @@ typedef struct DumpState { int64_t begin; int64_t length; + void *elf_header; 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 */