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From d1e147a3133d4d31d4b0c02c05916366fadd9c30 Mon Sep 17 00:00:00 2001
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From: Janosch Frank <frankja@linux.ibm.com>
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Date: Thu, 11 Aug 2022 12:11:00 +0000
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Subject: [PATCH 28/42] dump: Split elf header functions into prepare and write
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Cédric Le Goater <clg@redhat.com>
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RH-MergeRequest: 226: s390: Enhanced Interpretation for PCI Functions and Secure Execution guest dump
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RH-Bugzilla: 1664378 2043909
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
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RH-Acked-by: Jon Maloy <jmaloy@redhat.com>
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RH-Commit: [28/41] f70a13ad443835e7f46b7c5e176e372d370ac797
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Let's split the write from the modification of the elf header so we
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can consolidate the write of the data in one function.
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Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
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Reviewed-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
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Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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Message-Id: <20220811121111.9878-8-frankja@linux.ibm.com>
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(cherry picked from commit 670e76998a61ca171200fcded3865b294a2d1243)
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Signed-off-by: Cédric Le Goater <clg@redhat.com>
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---
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dump/dump.c | 100 ++++++++++++++++++++++++++++------------------------
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1 file changed, 53 insertions(+), 47 deletions(-)
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diff --git a/dump/dump.c b/dump/dump.c
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index 902a85ef8e..8d5226f861 100644
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--- a/dump/dump.c
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+++ b/dump/dump.c
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@@ -132,7 +132,7 @@ static int fd_write_vmcore(const void *buf, size_t size, void *opaque)
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return 0;
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}
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-static void write_elf64_header(DumpState *s, Error **errp)
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+static void prepare_elf64_header(DumpState *s, Elf64_Ehdr *elf_header)
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{
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/*
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* phnum in the elf header is 16 bit, if we have more segments we
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@@ -140,34 +140,27 @@ static void write_elf64_header(DumpState *s, Error **errp)
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* special section.
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*/
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uint16_t phnum = MIN(s->phdr_num, PN_XNUM);
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- Elf64_Ehdr elf_header;
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- int ret;
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- memset(&elf_header, 0, sizeof(Elf64_Ehdr));
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- memcpy(&elf_header, ELFMAG, SELFMAG);
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- elf_header.e_ident[EI_CLASS] = ELFCLASS64;
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- elf_header.e_ident[EI_DATA] = s->dump_info.d_endian;
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- elf_header.e_ident[EI_VERSION] = EV_CURRENT;
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- elf_header.e_type = cpu_to_dump16(s, ET_CORE);
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- elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine);
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- elf_header.e_version = cpu_to_dump32(s, EV_CURRENT);
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- elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header));
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- elf_header.e_phoff = cpu_to_dump64(s, s->phdr_offset);
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- elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf64_Phdr));
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- elf_header.e_phnum = cpu_to_dump16(s, phnum);
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+ memset(elf_header, 0, sizeof(Elf64_Ehdr));
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+ memcpy(elf_header, ELFMAG, SELFMAG);
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+ elf_header->e_ident[EI_CLASS] = ELFCLASS64;
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+ elf_header->e_ident[EI_DATA] = s->dump_info.d_endian;
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+ elf_header->e_ident[EI_VERSION] = EV_CURRENT;
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+ elf_header->e_type = cpu_to_dump16(s, ET_CORE);
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+ elf_header->e_machine = cpu_to_dump16(s, s->dump_info.d_machine);
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+ elf_header->e_version = cpu_to_dump32(s, EV_CURRENT);
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+ elf_header->e_ehsize = cpu_to_dump16(s, sizeof(elf_header));
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+ elf_header->e_phoff = cpu_to_dump64(s, s->phdr_offset);
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+ elf_header->e_phentsize = cpu_to_dump16(s, sizeof(Elf64_Phdr));
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+ elf_header->e_phnum = cpu_to_dump16(s, phnum);
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if (s->shdr_num) {
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- elf_header.e_shoff = cpu_to_dump64(s, s->shdr_offset);
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- elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf64_Shdr));
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- elf_header.e_shnum = cpu_to_dump16(s, s->shdr_num);
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- }
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-
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- ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
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- if (ret < 0) {
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- error_setg_errno(errp, -ret, "dump: failed to write elf header");
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+ elf_header->e_shoff = cpu_to_dump64(s, s->shdr_offset);
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+ elf_header->e_shentsize = cpu_to_dump16(s, sizeof(Elf64_Shdr));
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+ elf_header->e_shnum = cpu_to_dump16(s, s->shdr_num);
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}
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}
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-static void write_elf32_header(DumpState *s, Error **errp)
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+static void prepare_elf32_header(DumpState *s, Elf32_Ehdr *elf_header)
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{
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/*
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* phnum in the elf header is 16 bit, if we have more segments we
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@@ -175,28 +168,45 @@ static void write_elf32_header(DumpState *s, Error **errp)
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* special section.
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*/
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uint16_t phnum = MIN(s->phdr_num, PN_XNUM);
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- Elf32_Ehdr elf_header;
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- int ret;
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- memset(&elf_header, 0, sizeof(Elf32_Ehdr));
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- memcpy(&elf_header, ELFMAG, SELFMAG);
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- elf_header.e_ident[EI_CLASS] = ELFCLASS32;
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- elf_header.e_ident[EI_DATA] = s->dump_info.d_endian;
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- elf_header.e_ident[EI_VERSION] = EV_CURRENT;
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- elf_header.e_type = cpu_to_dump16(s, ET_CORE);
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- elf_header.e_machine = cpu_to_dump16(s, s->dump_info.d_machine);
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- elf_header.e_version = cpu_to_dump32(s, EV_CURRENT);
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- elf_header.e_ehsize = cpu_to_dump16(s, sizeof(elf_header));
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- elf_header.e_phoff = cpu_to_dump32(s, s->phdr_offset);
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- elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf32_Phdr));
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- elf_header.e_phnum = cpu_to_dump16(s, phnum);
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+ memset(elf_header, 0, sizeof(Elf32_Ehdr));
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+ memcpy(elf_header, ELFMAG, SELFMAG);
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+ elf_header->e_ident[EI_CLASS] = ELFCLASS32;
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+ elf_header->e_ident[EI_DATA] = s->dump_info.d_endian;
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+ elf_header->e_ident[EI_VERSION] = EV_CURRENT;
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+ elf_header->e_type = cpu_to_dump16(s, ET_CORE);
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+ elf_header->e_machine = cpu_to_dump16(s, s->dump_info.d_machine);
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+ elf_header->e_version = cpu_to_dump32(s, EV_CURRENT);
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+ elf_header->e_ehsize = cpu_to_dump16(s, sizeof(elf_header));
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+ elf_header->e_phoff = cpu_to_dump32(s, s->phdr_offset);
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+ elf_header->e_phentsize = cpu_to_dump16(s, sizeof(Elf32_Phdr));
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+ elf_header->e_phnum = cpu_to_dump16(s, phnum);
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if (s->shdr_num) {
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- elf_header.e_shoff = cpu_to_dump32(s, s->shdr_offset);
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- elf_header.e_shentsize = cpu_to_dump16(s, sizeof(Elf32_Shdr));
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- elf_header.e_shnum = cpu_to_dump16(s, s->shdr_num);
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+ elf_header->e_shoff = cpu_to_dump32(s, s->shdr_offset);
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+ elf_header->e_shentsize = cpu_to_dump16(s, sizeof(Elf32_Shdr));
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+ elf_header->e_shnum = cpu_to_dump16(s, s->shdr_num);
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}
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+}
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- ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
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+static void write_elf_header(DumpState *s, Error **errp)
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+{
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+ Elf32_Ehdr elf32_header;
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+ Elf64_Ehdr elf64_header;
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+ size_t header_size;
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+ void *header_ptr;
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+ int ret;
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+
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+ if (dump_is_64bit(s)) {
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+ prepare_elf64_header(s, &elf64_header);
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+ header_size = sizeof(elf64_header);
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+ header_ptr = &elf64_header;
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+ } else {
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+ prepare_elf32_header(s, &elf32_header);
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+ header_size = sizeof(elf32_header);
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+ header_ptr = &elf32_header;
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+ }
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+
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+ ret = fd_write_vmcore(header_ptr, header_size, s);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "dump: failed to write elf header");
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}
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@@ -565,11 +575,7 @@ static void dump_begin(DumpState *s, Error **errp)
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*/
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/* write elf header to vmcore */
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- if (dump_is_64bit(s)) {
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- write_elf64_header(s, errp);
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- } else {
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- write_elf32_header(s, errp);
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- }
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+ write_elf_header(s, errp);
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if (*errp) {
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return;
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}
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--
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2.37.3
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