Gentoo has slightly modified linker defaults: --hash-style=gnu
This means all ELF files in system have '.gnu.hash' section
but no '.hash' section.
gnuefi's ldscript did not account for it and as a result
one symbol 'ImageBase' did not resolve locally for elilo.so
and caused 'elilo' to fail to load by ia64 EFI:
Loading.: Gentoo (try new elilo)
ImageAddress: pointer is outside of image
ImageAddress: pointer is outside of image
Those two relocations come from crt0-efi-ia64.S PE32 entry point
fdescr:
```
#define IMAGE_REL_BASED_DIR64<->10
.section .reloc, "a"
data4 _start_plabel // Page RVA
data4 12 // Block Size (2*4+2*2)
data2 (IMAGE_REL_BASED_DIR64<<12) + 0 // reloc for plabel's entry point
data2 (IMAGE_REL_BASED_DIR64<<12) + 8 // reloc for plabel's global pointer
```
These refer ImageBase.
The change adds '.gnu.hash' collection (follows existing '.hash'
collection).
Tested on IA-64 by successfully booting elilo-3.16.
Bug: https://bugs.gentoo.org/575300
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
decide to stick stuff we don't explicitly mention at 0,
no matter what else has already explicitly been located there.
A debian/ubuntu builder noted:
gcc -O0 -g3 -fpic -Wall -fshort-wchar -fno-strict-aliasing \
-fno-merge-constants -ffreestanding -fno-stack-protector \
-fno-stack-check --std=c11 -DCONFIG_aarch64 -D__KERNEL__ \
-I/usr/include/efi/ -I/usr/include/efi/aarch64/ \
-iquote/«PKGBUILDDIR»/include "-DDEBUGDIR=L\"/\"" \
-ffreestanding -I/usr/lib/gcc/aarch64-linux-gnu/4.9/include \
-c -o fakeesrt2.o fakeesrt2.c
ld -nostdlib --warn-common --no-undefined --fatal-warnings -shared \
-Bsymbolic -L/usr/lib -L/usr/lib --build-id=sha1 \
/usr/lib/crt0-efi-aarch64.o --defsym=EFI_SUBSYSTEM=0xa \
-o fakeesrt2.so fakeesrt2.o -lefi -lgnuefi \
/usr/lib/gcc/aarch64-linux-gnu/4.9/libgcc.a \
-T elf_aarch64_efi.lds
ld: section .note.gnu.build-id loaded at [00000000,00000023] overlaps section .text loaded at [00000000,0000668f]
This shouldn't be a problem if we explicitly tell it where to put them.
Ard added a patch to do this on Arm and aarch64 targets in 16409cad4cb,
but it needs to be everywhere.
Signed-off-by: Peter Jones <pjones@redhat.com>
Signed-off-by: Nigel Croxon <nigel.croxon@hpe.com>
all of our linker scripts:
_text
_etext
_text_size
_data
_edata
_data_size
There are various things that are slightly different (positions of
.rela*, .dynamic, and similar in relation to .data), but _text and _data
are now always at the beginning of their respective sections with regard
to how a debuger would reference the debug info, and _etext and _edata
are now always extant and guaranteed to be after any of the respective
kind of data the debugger would look for in that section.
This also adds an application example of how it might be used, and a
makefile target for %.efi.debug which will generate a separate debuginfo
file for that example.
This also enables debugging by default (i.e. -g is in CFLAGS) and adds
.note.gnu.build-id sections to our .so files (i.e. --build-id=sha1 is in
LDFLAGS).
Signed-off-by: Peter Jones <pjones@redhat.com>
Signed-off-by: Nigel Croxon <nigel.croxon@hp.com>
