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[PULL,05/17] dump: select header bitness based on ELF class, not ELF architecture

Message ID 1402498262-20521-6-git-send-email-lcapitulino@redhat.com
State New
Headers show

Commit Message

Luiz Capitulino June 11, 2014, 2:50 p.m. UTC 
From: Laszlo Ersek <lersek@redhat.com>

The specific ELF architecture (d_machine) carries Too Much Information
(TM) for deciding between create_header32() and create_header64(), use
"d_class" instead (ELFCLASS32 vs. ELFCLASS64).

This change adapts write_dump_header() to write_elf_loads(), dump_begin()
etc. that also rely on the ELF class of the target for bitness selection.

Considering the current targets that support dumping, cpu_get_dump_info()
works as follows:
- target-s390x/arch_dump.c: (EM_S390, ELFCLASS64) only
- target-ppc/arch_dump.c (EM_PPC64, ELFCLASS64) only
- target-i386/arch_dump.c: sets (EM_X86_64, ELFCLASS64) vs. (EM_386,
  ELFCLASS32) keying off the same Long Mode Active flag.

Hence no observable change.

Approximately-suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 dump.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/dump.c b/dump.c
index e0a606f..7e0982b 100644
--- a/dump.c
+++ b/dump.c
@@ -1000,7 +1000,7 @@  out:
 
 static int write_dump_header(DumpState *s)
 {
-    if (s->dump_info.d_machine == EM_386) {
+    if (s->dump_info.d_class == ELFCLASS32) {
         return create_header32(s);
     } else {
         return create_header64(s);