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llvm-project/lld/test/COFF/gfids-export.s

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[COFF] Add exported functions to gfids table for /guard:cf Summary: MSVC does this, and we should to. The .gfids table is a table of RVAs, so it's impossible for a DLL to indicate that an imported symbol is address taken. Therefore, exports appear to be listed as address taken by the DLL that exports them. This fixes an issue that Firefox ran into here: https://bugzilla.mozilla.org/show_bug.cgi?id=1485016#c12 In Firefox, the export directive came from a .def file, but we need to do this for any kind of export. Reviewers: dmajor, hans, amccarth, alex Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D54723 llvm-svn: 347623
2018-11-27 09:50:17 +08:00
# REQUIRES: x86
# RUN: llvm-mc -triple x86_64-pc-win32 %s -filetype=obj -o %t.obj
# RUN: lld-link %t.obj -guard:cf -dll -out:%t.dll -noentry
[test] Change llvm-readobj -long-option to --long-option or well-known short options. NFC Also change some options that have different semantics (cause confusion) in llvm-readelf mode: -s => -S -t => --symbols -sd => --section-data llvm-svn: 359651
2019-05-01 13:49:01 +08:00
# RUN: llvm-readobj --coff-load-config %t.dll | FileCheck %s --check-prefix=CHECK
[COFF] Add exported functions to gfids table for /guard:cf Summary: MSVC does this, and we should to. The .gfids table is a table of RVAs, so it's impossible for a DLL to indicate that an imported symbol is address taken. Therefore, exports appear to be listed as address taken by the DLL that exports them. This fixes an issue that Firefox ran into here: https://bugzilla.mozilla.org/show_bug.cgi?id=1485016#c12 In Firefox, the export directive came from a .def file, but we need to do this for any kind of export. Reviewers: dmajor, hans, amccarth, alex Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D54723 llvm-svn: 347623
2018-11-27 09:50:17 +08:00
# There should be a single entry in the table for the exported symbol.
#
# CHECK: GuardFidTable [
# CHECK-NEXT: 0x180001000
# CHECK-NEXT: ]
.def func_export; .scl 2; .type 32; .endef
.globl func_export
.section .text,"xr",one_only,func_export
.p2align 4
func_export:
movl $1, %eax
.globl label_export
label_export:
movl $2, %eax
ret
.data
.globl data_export
data_export:
.long 42
.section .drectve,"dr"
.ascii " /EXPORT:func_export"
.ascii " /EXPORT:label_export"
.ascii " /EXPORT:data_export"
# Load configuration directory entry (winnt.h _IMAGE_LOAD_CONFIG_DIRECTORY64).
# The linker will define the __guard_* symbols.
.section .rdata,"dr"
.globl _load_config_used
_load_config_used:
.long 256
.fill 124, 1, 0
.quad __guard_fids_table
.quad __guard_fids_count
.long __guard_flags
.fill 128, 1, 0