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llvm-project/llvm/test/CodeGen/X86/code-model-elf-sections.ll
Peter Collingbourne c88b537771
Target: Stop assigning RELRO sections to .ldata.rel.ro. 
Linkers do not currently support PT_GNU_RELRO for SHF_X86_64_LARGE
sections; that would require the linker to emit more than one
PT_GNU_RELRO because large sections are discontiguous by design,
and most ELF dynamic loaders do not support that (bionic appears to
support it but glibc/musl/FreeBSD/NetBSD/OpenBSD appear not to). With
current linkers these sections will end up in .ldata which results
in silently disabling RELRO. Therefore, disable SHF_X86_64_LARGE for
RELRO sections. If this ever gets supported by downstream components
in the future we could add an opt-in flag for moving these sections
to .ldata.rel.ro which would trigger the creation of a second
PT_GNU_RELRO.

Reviewers: MaskRay, aeubanks

Reviewed By: aeubanks

Pull Request: https://github.com/llvm/llvm-project/pull/137742
2025-04-29 12:40:43 -07:00

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; RUN: llc < %s -relocation-model=pic -filetype=obj -code-model=small -o %t
; RUN: llvm-readelf -S %t | FileCheck %s --check-prefix=SMALL
; RUN: llc < %s -relocation-model=pic -filetype=obj -code-model=medium -o %t
; RUN: llvm-readelf -S %t | FileCheck %s --check-prefix=LARGE
; RUN: llc < %s -relocation-model=pic -filetype=obj -code-model=medium -large-data-threshold=79 -o %t
; RUN: llvm-readelf -S %t | FileCheck %s --check-prefix=LARGE
; RUN: llc < %s -relocation-model=pic -filetype=obj -code-model=medium -large-data-threshold=80 -o %t
; RUN: llvm-readelf -S %t | FileCheck %s --check-prefix=SMALL
; RUN: llc < %s -relocation-model=pic -filetype=obj -code-model=large -large-data-threshold=79 -o %t
; RUN: llvm-readelf -S %t | FileCheck %s --check-prefix=LARGE
; RUN: llc < %s -relocation-model=pic -filetype=obj -code-model=large -large-data-threshold=80 -o %t
; RUN: llvm-readelf -S %t | FileCheck %s --check-prefix=SMALL
; RUN: llc < %s -relocation-model=pic -filetype=obj -code-model=small -data-sections -o %t
; RUN: llvm-readelf -S %t | FileCheck %s --check-prefix=SMALL-DS
; RUN: llc < %s -relocation-model=pic -filetype=obj -code-model=medium -data-sections -o %t
; RUN: llvm-readelf -S %t | FileCheck %s --check-prefix=LARGE-DS
; RUN: llc < %s -relocation-model=pic -filetype=obj -code-model=large -data-sections -o %t
; RUN: llvm-readelf -S %t | FileCheck %s --check-prefix=LARGE-DS
; SMALL: .data {{.*}} WA {{.*}}
; SMALL: .data.x {{.*}} WA {{.*}}
; SMALL: .data0 {{.*}} WA {{.*}}
; SMALL: .ldata {{.*}} WAl {{.*}}
; SMALL: .ldata.x {{.*}} WAl {{.*}}
; SMALL: .ldata0 {{.*}} WA {{.*}}
; SMALL: force_small {{.*}} WA {{.*}}
; SMALL: force_large {{.*}} WAl {{.*}}
; SMALL: foo {{.*}} WA {{.*}}
; SMALL: .bss {{.*}} WA {{.*}}
; SMALL: .lbss {{.*}} WAl {{.*}}
; SMALL: .rodata {{.*}} A {{.*}}
; SMALL: .lrodata {{.*}} Al {{.*}}
; SMALL: .data.rel.ro {{.*}} WA {{.*}}
; SMALL: .tbss {{.*}} WAT {{.*}}
; SMALL: .tdata {{.*}} WAT {{.*}}
; SMALL-DS: .data {{.*}} WA {{.*}}
; SMALL-DS: .data.x {{.*}} WA {{.*}}
; SMALL-DS: .data0 {{.*}} WA {{.*}}
; SMALL-DS: .ldata {{.*}} WAl {{.*}}
; SMALL-DS: .ldata.x {{.*}} WAl {{.*}}
; SMALL-DS: .ldata0 {{.*}} WA {{.*}}
; SMALL-DS: .data.data {{.*}} WA {{.*}}
; SMALL-DS: force_small {{.*}} WA {{.*}}
; SMALL-DS: force_large {{.*}} WAl {{.*}}
; SMALL-DS: foo {{.*}} WA {{.*}}
; SMALL-DS: .lbss {{.*}} WAl {{.*}}
; SMALL-DS: .bss.bss {{.*}} WA {{.*}}
; SMALL-DS: .lrodata {{.*}} Al {{.*}}
; SMALL-DS: .rodata.rodata {{.*}} A {{.*}}
; SMALL-DS: .data.rel.ro.relro {{.*}} WA {{.*}}
; SMALL-DS: .tbss.tbss {{.*}} WAT {{.*}}
; SMALL-DS: .tdata.tdata {{.*}} WAT {{.*}}
; LARGE: .data {{.*}} WA {{.*}}
; LARGE: .data.x {{.*}} WA {{.*}}
; LARGE: .data0 {{.*}} WA {{.*}}
; LARGE: .ldata {{.*}} WAl {{.*}}
; LARGE: .ldata.x {{.*}} WAl {{.*}}
; LARGE: .ldata0 {{.*}} WA {{.*}}
; LARGE: force_small {{.*}} WA {{.*}}
; LARGE: force_large {{.*}} WAl {{.*}}
; LARGE: foo {{.*}} WA {{.*}}
; LARGE: .bss {{.*}} WA {{.*}}
; LARGE: .lbss {{.*}} WAl {{.*}}
; LARGE: .rodata {{.*}} A {{.*}}
; LARGE: .lrodata {{.*}} Al {{.*}}
; LARGE: .data.rel.ro {{.*}} WA {{.*}}
; LARGE: .tbss {{.*}} WAT {{.*}}
; LARGE: .tdata {{.*}} WAT {{.*}}
; LARGE-DS: .data {{.*}} WA {{.*}}
; LARGE-DS: .data.x {{.*}} WA {{.*}}
; LARGE-DS: .data0 {{.*}} WA {{.*}}
; LARGE-DS: .ldata {{.*}} WAl {{.*}}
; LARGE-DS: .ldata.x {{.*}} WAl {{.*}}
; LARGE-DS: .ldata0 {{.*}} WA {{.*}}
; LARGE-DS: .ldata.data {{.*}} WAl {{.*}}
; LARGE-DS: force_small {{.*}} WA {{.*}}
; LARGE-DS: force_large {{.*}} WAl {{.*}}
; LARGE-DS: foo {{.*}} WA {{.*}}
; LARGE-DS: .bss {{.*}} WA {{.*}}
; LARGE-DS: .lbss.bss {{.*}} WAl {{.*}}
; LARGE-DS: .rodata {{.*}} A {{.*}}
; LARGE-DS: .lrodata.rodata {{.*}} Al {{.*}}
; LARGE-DS: .data.rel.ro.relro {{.*}} WA {{.*}}
; LARGE-DS: .tbss.tbss {{.*}} WAT {{.*}}
; LARGE-DS: .tdata.tdata {{.*}} WAT {{.*}}
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64--linux"
@data_with_explicit_section = internal global [10 x i64] [i64 1, i64 2, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0], section ".data"
@data_with_explicit_section2 = internal global [10 x i64] [i64 1, i64 2, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0], section ".data.x"
@data_with_explicit_section0 = internal global [10 x i64] [i64 1, i64 2, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0], section ".data0"
@ldata_with_explicit_section = internal global [10 x i64] [i64 1, i64 2, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0], section ".ldata"
@ldata_with_explicit_section2 = internal global [10 x i64] [i64 1, i64 2, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0], section ".ldata.x"
@ldata_with_explicit_section0 = internal global [10 x i64] [i64 1, i64 2, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0], section ".ldata0"
@data = internal global [10 x i64] [i64 1, i64 2, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0]
@data_force_small = internal global [10 x i64] [i64 1, i64 2, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0], code_model "small", section "force_small"
@data_force_large = internal global [10 x i64] [i64 1, i64 2, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0], code_model "large", section "force_large"
@data_force_small_ldata = internal global [10 x i64] [i64 1, i64 2, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0], code_model "small", section ".ldata"
@data_force_large_data = internal global [10 x i64] [i64 1, i64 2, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0], code_model "large", section ".data"
@foo_with_explicit_section = internal global [10 x i64] [i64 1, i64 2, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0], section "foo"
@bss_with_explicit_section = internal global [10 x i64] zeroinitializer, section ".bss"
@lbss_with_explicit_section = internal global [10 x i64] zeroinitializer, section ".lbss"
@bss = internal global [10 x i64] zeroinitializer
@rodata_with_explicit_section = internal constant [10 x i64] zeroinitializer, section ".rodata"
@lrodata_with_explicit_section = internal constant [10 x i64] zeroinitializer, section ".lrodata"
@rodata = internal constant [10 x i64] zeroinitializer
@relro = internal constant [10 x ptr] [ptr @func, ptr @func, ptr @func, ptr @func, ptr @func, ptr @func, ptr @func, ptr @func, ptr @func, ptr @func]
@tbss = internal thread_local global [10 x i64] zeroinitializer
@tdata = internal thread_local global [10 x i64] [i64 1, i64 2, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0, i64 0]
declare void @func()
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