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Author	SHA1	Message	Date
Dan Willemsen	a0790e35c7	Rework how linux_bionic is built with LLD 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	2018-10-22 15:46:03 -07:00
Colin Cross	f46e37f5f7	Fix format string issues Fix issues caught by go vet. Test: m checkbuild Change-Id: Ib8d740457c15432dabe1575a6707726ddaf93084	2018-03-28 15:54:52 -07:00
Dan Willemsen	c77a0b3f9c	Extract the linker and embed it into host bionic binaries 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	2017-09-20 15:34:33 -07:00

Author

SHA1

Message

Date

Dan Willemsen

a0790e35c7

Rework how linux_bionic is built with LLD

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

2018-10-22 15:46:03 -07:00

Colin Cross

f46e37f5f7

Fix format string issues

Fix issues caught by go vet.

Test: m checkbuild
Change-Id: Ib8d740457c15432dabe1575a6707726ddaf93084

2018-03-28 15:54:52 -07:00

Dan Willemsen

c77a0b3f9c

Extract the linker and embed it into host bionic binaries

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

2017-09-20 15:34:33 -07:00

3 commits