Discarding PT_INTERP in the linker script generated for the embedded
linker allows linking without the --no-dynamic-linker argument.
Bug: 216192129
Test: manual
Change-Id: I0e293944c5c804b4512fb834f8f18e1d6ecd053c
Add __dlwrap_linker and __dlwrap_linker_end symbols for use by the
embedded linker trampoline to determine which load segments are
part of the embedded linker and should not be exposed to the
executable.
Use flags to name the sections to avoid colliding with __dlwrap_linker
when no section name can be determined.
Bug: 190084016
Test: build with musl
Change-Id: I51ccbf9c15a65c6194fa263b7504a598dbf4ad18
Use a note added to linker.s to place the linker in the linker script,
which will work musl, which doesn't have .note.android.ident, while
continuing to work for linux bionic.
Test: m checkbuild
Change-Id: I9cd4ad7c8e8fcb4d725746106d5beaa699a77807
Use an implicit linker script instead of flags in a file to specify
the locations of the host bionic embedded linker and to prevent it
from being stripped.
Test: build and run host bionic binary
Change-Id: I64e12118d33c67bab5e657cbc3ea8cde8f0fd7e6
Replace .linker.sect0, etc. with .linker, .linker.text, .linker.data
and .linker.data.rel.ro by extracting the name of the first section
in each program header.
Test: build and run host bionic binary
Change-Id: I25107547536a3a3963fdeb311c45a7ee53c0bc45
In order to simplify the wrapper function, and stop using a linker
script, generate a set of flags to pass to LLD. Then run
host_bionic_inject on the linked binary in order to verify the
embedding, and give the wrapper function the address of the original
entry point (_start).
Bug: 31559095
Test: build host bionic with prebuilts/build-tools/build-prebuilts.sh
Change-Id: I53e326050e0f9caa562c6cf6f76c4d0337bb6faf
The linux kernel requires that the ELF interpreter (runtime linker)
that's referenced by PT_INTERP be either an absolute path, or a relative
path from the current working directory. We'd prefer a relative path
from the binary, similarly to how we handle looking up shared libraries,
but that's not supported.
Instead, extract the load sections from the runtime linker ELF binary
and embed them into each host bionic binary, omitting the PT_INTERP
declaration. The kernel will treat it as a static binary, and we'll use
a special entry point (linker_wrapper) to fix up the arguments passed by
the kernel before jumping to the embedded linker. From the linker's
point of view, it looks like the kernel loaded the linker like normal.
Bug: 31559095
Test: Enable host bionic,
out/soong/host/linux_bionic-x86/nativetest64/libdemangle_test/libdemangle_test
Change-Id: I8d0aea9790b5e86fcc3ea6e2d00cfa33907e2853
