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(unknown [9.114.12.104]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 1 Mar 2022 14:22:24 +0000 (GMT) From: Janosch Frank To: qemu-devel@nongnu.org Subject: [PATCH 3/7] dump: Add more offset variables Date: Tue, 1 Mar 2022 14:22:09 +0000 Message-Id: <20220301142213.28568-4-frankja@linux.ibm.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220301142213.28568-1-frankja@linux.ibm.com> References: <20220301142213.28568-1-frankja@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 84FKHI9Z3UpCEg4y4aeMvIACV7iRODVs X-Proofpoint-ORIG-GUID: dtbTCLgGQDlyY9f2kbNYwUDXrODinLnj 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=2022-03-01_07,2022-02-26_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 mlxscore=0 adultscore=0 clxscore=1015 spamscore=0 bulkscore=0 lowpriorityscore=0 mlxlogscore=999 suspectscore=0 impostorscore=0 malwarescore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2201110000 definitions=main-2203010077 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, pbonzini@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Offset calculations are easy enough to get wrong. Let's add a few variables to make moving around elf headers and data sections easier. Signed-off-by: Janosch Frank Reviewed-by: Marc-André Lureau --- dump/dump.c | 34 ++++++++++++++-------------------- include/sysemu/dump.h | 4 ++++ 2 files changed, 18 insertions(+), 20 deletions(-) diff --git a/dump/dump.c b/dump/dump.c index ce3a5e7003..242f83db95 100644 --- a/dump/dump.c +++ b/dump/dump.c @@ -137,13 +137,11 @@ static void write_elf64_header(DumpState *s, Error **errp) 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, sizeof(Elf64_Ehdr)); + 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); if (s->shdr_num) { - uint64_t shoff = sizeof(Elf64_Ehdr) + sizeof(Elf64_Phdr) * s->phdr_num; - - elf_header.e_shoff = cpu_to_dump64(s, shoff); + 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); } @@ -169,13 +167,11 @@ static void write_elf32_header(DumpState *s, Error **errp) 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, sizeof(Elf32_Ehdr)); + 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); if (s->shdr_num) { - uint32_t shoff = sizeof(Elf32_Ehdr) + sizeof(Elf32_Phdr) * s->phdr_num; - - elf_header.e_shoff = cpu_to_dump32(s, shoff); + 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); } @@ -238,12 +234,11 @@ static void write_elf32_load(DumpState *s, MemoryMapping *memory_mapping, static void write_elf64_note(DumpState *s, Error **errp) { Elf64_Phdr phdr; - hwaddr begin = s->memory_offset - s->note_size; int ret; memset(&phdr, 0, sizeof(Elf64_Phdr)); phdr.p_type = cpu_to_dump32(s, PT_NOTE); - phdr.p_offset = cpu_to_dump64(s, begin); + phdr.p_offset = cpu_to_dump64(s, s->note_offset); phdr.p_paddr = 0; phdr.p_filesz = cpu_to_dump64(s, s->note_size); phdr.p_memsz = cpu_to_dump64(s, s->note_size); @@ -303,13 +298,12 @@ static void write_elf64_notes(WriteCoreDumpFunction f, DumpState *s, static void write_elf32_note(DumpState *s, Error **errp) { - hwaddr begin = s->memory_offset - s->note_size; Elf32_Phdr phdr; int ret; memset(&phdr, 0, sizeof(Elf32_Phdr)); phdr.p_type = cpu_to_dump32(s, PT_NOTE); - phdr.p_offset = cpu_to_dump32(s, begin); + phdr.p_offset = cpu_to_dump32(s, s->note_offset); phdr.p_paddr = 0; phdr.p_filesz = cpu_to_dump32(s, s->note_size); phdr.p_memsz = cpu_to_dump32(s, s->note_size); @@ -1828,15 +1822,15 @@ static void dump_init(DumpState *s, int fd, bool has_format, } if (s->dump_info.d_class == ELFCLASS64) { - s->memory_offset = sizeof(Elf64_Ehdr) + - sizeof(Elf64_Phdr) * s->phdr_num + - sizeof(Elf64_Shdr) * s->shdr_num + - s->note_size; + s->phdr_offset = sizeof(Elf64_Ehdr); + s->shdr_offset = s->phdr_offset + sizeof(Elf64_Phdr) * s->phdr_num; + s->note_offset = s->shdr_offset + sizeof(Elf64_Shdr) * s->shdr_num; + s->memory_offset = s->note_offset + s->note_size; } else { - s->memory_offset = sizeof(Elf32_Ehdr) + - sizeof(Elf32_Phdr) * s->phdr_num + - sizeof(Elf32_Shdr) * s->shdr_num + - s->note_size; + s->phdr_offset = sizeof(Elf32_Ehdr); + s->shdr_offset = s->phdr_offset + sizeof(Elf32_Phdr) * s->phdr_num; + s->note_offset = s->shdr_offset + sizeof(Elf32_Shdr) * s->shdr_num; + s->memory_offset = s->note_offset + s->note_size; } return; diff --git a/include/sysemu/dump.h b/include/sysemu/dump.h index 19458bffbd..ffc2ea1072 100644 --- a/include/sysemu/dump.h +++ b/include/sysemu/dump.h @@ -159,6 +159,10 @@ typedef struct DumpState { bool resume; bool detached; ssize_t note_size; + hwaddr shdr_offset; + hwaddr phdr_offset; + hwaddr section_offset; + hwaddr note_offset; hwaddr memory_offset; int fd;