[v2,3/9] dump: Introduce shdr_num to decrease complexity

Commit Message

Janosch Frank March 10, 2022, 11:08 a.m. UTC

Let's move from a boolean to a int variable which will later enable us
to store the number of sections that are in the dump file.

Signed-off-by: Janosch Frank <[e-mail]>
---
 dump/dump.c           | 24 ++++++++++++------------
 include/sysemu/dump.h |  2 +-
 2 files changed, 13 insertions(+), 13 deletions(-)

Comments

Richard Henderson March 11, 2022, 7:41 p.m. UTC | #1

On 3/10/22 03:08, Janosch Frank wrote:
> Let's move from a boolean to a int variable which will later enable us
> to store the number of sections that are in the dump file.
> 
> Signed-off-by: Janosch Frank<[e-mail]>
> ---
>   dump/dump.c           | 24 ++++++++++++------------
>   include/sysemu/dump.h |  2 +-
>   2 files changed, 13 insertions(+), 13 deletions(-)

Reviewed-by: Richard Henderson <[e-mail]>

r~

Patch

diff --git a/dump/dump.c b/dump/dump.c
index 7015c92177..c5ca6027ae 100644
--- a/dump/dump.c
+++ b/dump/dump.c
@@ -140,12 +140,12 @@  static void write_elf64_header(DumpState *s, Error **errp)
     elf_header.e_phoff = cpu_to_dump64(s, sizeof(Elf64_Ehdr));
     elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf64_Phdr));
     elf_header.e_phnum = cpu_to_dump16(s, phnum);
-    if (s->have_section) {
+    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_shentsize = cpu_to_dump16(s, sizeof(Elf64_Shdr));
-        elf_header.e_shnum = cpu_to_dump16(s, 1);
+        elf_header.e_shnum = cpu_to_dump16(s, s->shdr_num);
     }
 
     ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
@@ -172,12 +172,12 @@  static void write_elf32_header(DumpState *s, Error **errp)
     elf_header.e_phoff = cpu_to_dump32(s, sizeof(Elf32_Ehdr));
     elf_header.e_phentsize = cpu_to_dump16(s, sizeof(Elf32_Phdr));
     elf_header.e_phnum = cpu_to_dump16(s, phnum);
-    if (s->have_section) {
+    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_shentsize = cpu_to_dump16(s, sizeof(Elf32_Shdr));
-        elf_header.e_shnum = cpu_to_dump16(s, 1);
+        elf_header.e_shnum = cpu_to_dump16(s, s->shdr_num);
     }
 
     ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
@@ -556,7 +556,7 @@  static void dump_begin(DumpState *s, Error **errp)
         }
 
         /* write section to vmcore */
-        if (s->have_section) {
+        if (s->shdr_num) {
             write_elf_section(s, 1, errp);
             if (*errp) {
                 return;
@@ -582,7 +582,7 @@  static void dump_begin(DumpState *s, Error **errp)
         }
 
         /* write section to vmcore */
-        if (s->have_section) {
+        if (s->shdr_num) {
             write_elf_section(s, 0, errp);
             if (*errp) {
                 return;
@@ -1793,11 +1793,11 @@  static void dump_init(DumpState *s, int fd, bool has_format,
      */
     s->phdr_num = 1; /* PT_NOTE */
     if (s->list.num < UINT16_MAX - 2) {
+        s->shdr_num = 0;
         s->phdr_num += s->list.num;
-        s->have_section = false;
     } else {
         /* sh_info of section 0 holds the real number of phdrs */
-        s->have_section = true;
+        s->shdr_num = 1;
 
         /* the type of shdr->sh_info is uint32_t, so we should avoid overflow */
         if (s->list.num <= UINT32_MAX - 1) {
@@ -1808,19 +1808,19 @@  static void dump_init(DumpState *s, int fd, bool has_format,
     }
 
     if (s->dump_info.d_class == ELFCLASS64) {
-        if (s->have_section) {
+        if (s->shdr_num) {
             s->memory_offset = sizeof(Elf64_Ehdr) +
                                sizeof(Elf64_Phdr) * s->phdr_num +
-                               sizeof(Elf64_Shdr) + s->note_size;
+                               sizeof(Elf64_Shdr) * s->shdr_num + s->note_size;
         } else {
             s->memory_offset = sizeof(Elf64_Ehdr) +
                                sizeof(Elf64_Phdr) * s->phdr_num + s->note_size;
         }
     } else {
-        if (s->have_section) {
+        if (s->shdr_num) {
             s->memory_offset = sizeof(Elf32_Ehdr) +
                                sizeof(Elf32_Phdr) * s->phdr_num +
-                               sizeof(Elf32_Shdr) + s->note_size;
+                               sizeof(Elf32_Shdr) * s->shdr_num + s->note_size;
         } else {
             s->memory_offset = sizeof(Elf32_Ehdr) +
                                sizeof(Elf32_Phdr) * s->phdr_num + s->note_size;
diff --git a/include/sysemu/dump.h b/include/sysemu/dump.h
index b463fc9c02..19458bffbd 100644
--- a/include/sysemu/dump.h
+++ b/include/sysemu/dump.h
@@ -155,7 +155,7 @@  typedef struct DumpState {
     ArchDumpInfo dump_info;
     MemoryMappingList list;
     uint32_t phdr_num;
-    bool have_section;
+    uint32_t shdr_num;
     bool resume;
     bool detached;
     ssize_t note_size;