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| author | Hans-Peter Nilsson <hp@axis.com> | 2023-01-03 03:19:54 +0100 |
|---|---|---|
| committer | Hans-Peter Nilsson <hp@bitrange.com> | 2023-01-12 20:36:08 +0100 |
| commit | 9d131130d2f35f1515855d786a9905d8eb8cce8f (patch) | |
| tree | 681793257d11f1aa26c4e3fb697137125eba1352 | |
| parent | 23b52b0ab4f7fdab81a197ea57c98b8c49730a26 (diff) | |
| download | gdb-9d131130d2f35f1515855d786a9905d8eb8cce8f.zip gdb-9d131130d2f35f1515855d786a9905d8eb8cce8f.tar.gz gdb-9d131130d2f35f1515855d786a9905d8eb8cce8f.tar.bz2 | |
ARM: Fix ld bloat introduced between binutils-2.38 and 2.39
Since commit 9833b7757d24, "PR28824, relro security issues",
ELF_MAXPAGESIZE matters much more, with regards to layout of
the linked file. That commit fixed an actual bug, but also
exposes a problem for targets were that value is too high.
For example, for ARM(32, a.k.a. "Aarch32") specifically
bfd_arch_arm, it's set to 64 KiB, making all Linux(/GNU)
targets pay an extra amount of up to 60 KiB of bloat in
DSO:s and executables. This matters when there are many
such files, and where storage is expensive.
It's *mostly* bloat when using a Linux kernel, as ARM(32) is
a good example of an target where ELF_MAXPAGESIZE is set to
an extreme value for an obscure corner-case. The ARM
(32-bit) kernel has 4 KiB pages, has had that value forever,
and can't be configured to any other value. The use-case is
IIUC "Aarch32" emulation on an "Aarch64" (arm64) kernel, but
not just that, but a setup where the Linux page-size is
configured to something other than the *default* 4 KiB. Not
sure there actually any such systems in use, again with
both Aarch32 compatibility support and a non-4KiB pagesize,
with all the warnings in the kernel config and requiring the
"EXPERT" level set on.
So, let's do like x86-64 in a2267dbfc9e1 "x86-64: Use only
one default max-page-size" and set ELF_MAXPAGESIZE to 4096.
bfd:
* elf32-arm.c (ELF_MAXPAGESIZE): Always set to 0x1000.
(cherry picked from commit 1a26a53a0dee39106ba58fcb15496c5f13074652)
| -rw-r--r-- | bfd/elf32-arm.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/bfd/elf32-arm.c b/bfd/elf32-arm.c index 0852b38..835c4ce 100644 --- a/bfd/elf32-arm.c +++ b/bfd/elf32-arm.c @@ -20249,11 +20249,7 @@ elf32_arm_backend_symbol_processing (bfd *abfd, asymbol *sym) #define ELF_ARCH bfd_arch_arm #define ELF_TARGET_ID ARM_ELF_DATA #define ELF_MACHINE_CODE EM_ARM -#ifdef __QNXTARGET__ #define ELF_MAXPAGESIZE 0x1000 -#else -#define ELF_MAXPAGESIZE 0x10000 -#endif #define ELF_COMMONPAGESIZE 0x1000 #define bfd_elf32_mkobject elf32_arm_mkobject |