diff mbox series

[v5,07/18] dump: Split elf header functions into prepare and write

Message ID 20220811121111.9878-8-frankja@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series dump: Add arch section and s390x PV dump | expand

Commit Message

Janosch Frank Aug. 11, 2022, 12:11 p.m. UTC 
Let's split the write from the modification of the elf header so we
can consolidate the write of the data in one function.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
---
 dump/dump.c | 100 ++++++++++++++++++++++++++++------------------------
 1 file changed, 53 insertions(+), 47 deletions(-)

Comments

Marc-André Lureau Aug. 16, 2022, 8:26 a.m. UTC | #1 
On Thu, Aug 11, 2022 at 4:29 PM Janosch Frank <frankja@linux.ibm.com> wrote:

> Let's split the write from the modification of the elf header so we
> can consolidate the write of the data in one function.
>
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
>

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>


> ---
>  dump/dump.c | 100 ++++++++++++++++++++++++++++------------------------
>  1 file changed, 53 insertions(+), 47 deletions(-)
>
> diff --git a/dump/dump.c b/dump/dump.c
> index d82cc46d7d..8a2a97a85e 100644
> --- a/dump/dump.c
> +++ b/dump/dump.c
> @@ -131,7 +131,7 @@ 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, Elf64_Ehdr *elf_header)
>  {
>      /*
>       * phnum in the elf header is 16 bit, if we have more segments we
> @@ -139,34 +139,27 @@ static void write_elf64_header(DumpState *s, Error
> **errp)
>       * special section.
>       */
>      uint16_t phnum = MIN(s->phdr_num, PN_XNUM);
> -    Elf64_Ehdr elf_header;
> -    int ret;
>
> -    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);
> +    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);
>      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, Elf32_Ehdr *elf_header)
>  {
>      /*
>       * phnum in the elf header is 16 bit, if we have more segments we
> @@ -174,28 +167,45 @@ static void write_elf32_header(DumpState *s, Error
> **errp)
>       * special section.
>       */
>      uint16_t phnum = MIN(s->phdr_num, PN_XNUM);
> -    Elf32_Ehdr 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);
> +    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);
> +    }
> +}
> +
> +static void write_elf_header(DumpState *s, Error **errp)
> +{
> +    Elf32_Ehdr elf32_header;
> +    Elf64_Ehdr elf64_header;
> +    size_t header_size;
> +    void *header_ptr;
>      int ret;
>
> -    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);
> -    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);
> +    if (dump_is_64bit(s)) {
> +        prepare_elf64_header(s, &elf64_header);
> +        header_size = sizeof(elf64_header);
> +        header_ptr = &elf64_header;
> +    } else {
> +        prepare_elf32_header(s, &elf32_header);
> +        header_size = sizeof(elf32_header);
> +        header_ptr = &elf32_header;
>      }
>
> -    ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
> +    ret = fd_write_vmcore(header_ptr, header_size, s);
>      if (ret < 0) {
>          error_setg_errno(errp, -ret, "dump: failed to write elf header");
>      }
> @@ -564,11 +574,7 @@ static void dump_begin(DumpState *s, Error **errp)
>       */
>
>      /* write elf header to vmcore */
> -    if (dump_is_64bit(s)) {
> -        write_elf64_header(s, errp);
> -    } else {
> -        write_elf32_header(s, errp);
> -    }
> +    write_elf_header(s, errp);
>      if (*errp) {
>          return;
>      }
> --
> 2.34.1
>
>
>
Janis Schoetterl-Glausch Sept. 1, 2022, 9:24 a.m. UTC | #2 
On Thu, 2022-08-11 at 12:11 +0000, Janosch Frank wrote:
> Let's split the write from the modification of the elf header so we
> can consolidate the write of the data in one function.
> 
> Signed-off-by: Janosch Frank <frankja@linux.ibm.com>

This is cosmetic only, right?

Reviewed-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com>
diff mbox series

Patch

diff --git a/dump/dump.c b/dump/dump.c
index d82cc46d7d..8a2a97a85e 100644
--- a/dump/dump.c
+++ b/dump/dump.c
@@ -131,7 +131,7 @@  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, Elf64_Ehdr *elf_header)
 {
     /*
      * phnum in the elf header is 16 bit, if we have more segments we
@@ -139,34 +139,27 @@  static void write_elf64_header(DumpState *s, Error **errp)
      * special section.
      */
     uint16_t phnum = MIN(s->phdr_num, PN_XNUM);
-    Elf64_Ehdr elf_header;
-    int ret;
 
-    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);
+    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);
     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, Elf32_Ehdr *elf_header)
 {
     /*
      * phnum in the elf header is 16 bit, if we have more segments we
@@ -174,28 +167,45 @@  static void write_elf32_header(DumpState *s, Error **errp)
      * special section.
      */
     uint16_t phnum = MIN(s->phdr_num, PN_XNUM);
-    Elf32_Ehdr 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);
+    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);
+    }
+}
+
+static void write_elf_header(DumpState *s, Error **errp)
+{
+    Elf32_Ehdr elf32_header;
+    Elf64_Ehdr elf64_header;
+    size_t header_size;
+    void *header_ptr;
     int ret;
 
-    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);
-    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);
+    if (dump_is_64bit(s)) {
+        prepare_elf64_header(s, &elf64_header);
+        header_size = sizeof(elf64_header);
+        header_ptr = &elf64_header;
+    } else {
+        prepare_elf32_header(s, &elf32_header);
+        header_size = sizeof(elf32_header);
+        header_ptr = &elf32_header;
     }
 
-    ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
+    ret = fd_write_vmcore(header_ptr, header_size, s);
     if (ret < 0) {
         error_setg_errno(errp, -ret, "dump: failed to write elf header");
     }
@@ -564,11 +574,7 @@  static void dump_begin(DumpState *s, Error **errp)
      */
 
     /* write elf header to vmcore */
-    if (dump_is_64bit(s)) {
-        write_elf64_header(s, errp);
-    } else {
-        write_elf32_header(s, errp);
-    }
+    write_elf_header(s, errp);
     if (*errp) {
         return;
     }