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llvm-project/lld/test/ELF/linkerscript/linkorder.s

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Fix pr32816. When using linkerscripts we were trying to sort SHF_LINK_ORDER sections too early. Instead of always doing two runs of assignAddresses, record the section order in processCommands. llvm-svn: 301830
2017-05-02 04:32:39 +08:00
# REQUIRES: x86
# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
[ELF] Keep orphan section names (.rodata.foo .text.foo) unchanged if !hasSectionsCommand This behavior matches GNU ld and seems reasonable. ``` // If a SECTIONS command is not specified .text.* -> .text .rodata.* -> .rodata .init_array.* -> .init_array ``` A proposed Linux feature CONFIG_FG_KASLR may depend on the GNU ld behavior. Reword a comment about -z keep-text-section-prefix and a comment about CommonSection (deleted by rL286234). Reviewed By: grimar Differential Revision: https://reviews.llvm.org/D75225
2020-02-26 10:00:13 +08:00
# RUN: echo "SECTIONS { .rodata : {*(.rodata*)} .text : {*(.text.bar) *(.text.foo)} }" > %t.script
Fix pr32816. When using linkerscripts we were trying to sort SHF_LINK_ORDER sections too early. Instead of always doing two runs of assignAddresses, record the section order in processCommands. llvm-svn: 301830
2017-05-02 04:32:39 +08:00
# RUN: ld.lld -o %t --script %t.script %t.o
# RUN: llvm-objdump -s %t | FileCheck %s
[ELF] Keep orphan section names (.rodata.foo .text.foo) unchanged if !hasSectionsCommand This behavior matches GNU ld and seems reasonable. ``` // If a SECTIONS command is not specified .text.* -> .text .rodata.* -> .rodata .init_array.* -> .init_array ``` A proposed Linux feature CONFIG_FG_KASLR may depend on the GNU ld behavior. Reword a comment about -z keep-text-section-prefix and a comment about CommonSection (deleted by rL286234). Reviewed By: grimar Differential Revision: https://reviews.llvm.org/D75225
2020-02-26 10:00:13 +08:00
# RUN: echo "SECTIONS { .rodata : {*(.rodata*)} .text : {*(.text.foo) *(.text.bar)} }" > %t.script
Fix pr32816. When using linkerscripts we were trying to sort SHF_LINK_ORDER sections too early. Instead of always doing two runs of assignAddresses, record the section order in processCommands. llvm-svn: 301830
2017-05-02 04:32:39 +08:00
# RUN: ld.lld -o %t --script %t.script %t.o
# RUN: llvm-objdump -s %t | FileCheck --check-prefix=INV %s
# CHECK: Contents of section .rodata:
# CHECK-NEXT: 02000000 00000000 01000000 00000000
[ELF] Assign RF_EXEC rank even if --no-rosegment or SECTIONS command is used Summary: Currently when --no-rosegment is specified or a linker script with SECTIONS command is used, .rodata (A) .text (AX) are assigned the same rank and .rodata may be placed after .text . This increases the gap between .text and .bss and can cause pc-relative relocation overflow (e.g. gcc crtbegin.o crtbegin.S have R_X86_64_PC32 relocation from .text to .bss). This patch makes SingleRoRx affect only segment layout, not section layout. As a consequence, .rodata will be placed before .text regardless of SingleRoRx. Reviewers: espindola, ruiu, grimar, echristo, javed.absar Subscribers: emaste, arichardson, llvm-commits Differential Revision: https://reviews.llvm.org/D48405 llvm-svn: 335627
2018-06-27 01:04:47 +08:00
# CHECK: Contents of section .text:
# CHECK-NEXT: 02000000 00000000 01000000 00000000
Fix pr32816. When using linkerscripts we were trying to sort SHF_LINK_ORDER sections too early. Instead of always doing two runs of assignAddresses, record the section order in processCommands. llvm-svn: 301830
2017-05-02 04:32:39 +08:00
# INV: Contents of section .rodata:
# INV-NEXT: 01000000 00000000 02000000 00000000
[ELF] Assign RF_EXEC rank even if --no-rosegment or SECTIONS command is used Summary: Currently when --no-rosegment is specified or a linker script with SECTIONS command is used, .rodata (A) .text (AX) are assigned the same rank and .rodata may be placed after .text . This increases the gap between .text and .bss and can cause pc-relative relocation overflow (e.g. gcc crtbegin.o crtbegin.S have R_X86_64_PC32 relocation from .text to .bss). This patch makes SingleRoRx affect only segment layout, not section layout. As a consequence, .rodata will be placed before .text regardless of SingleRoRx. Reviewers: espindola, ruiu, grimar, echristo, javed.absar Subscribers: emaste, arichardson, llvm-commits Differential Revision: https://reviews.llvm.org/D48405 llvm-svn: 335627
2018-06-27 01:04:47 +08:00
# INV: Contents of section .text:
# INV-NEXT: 01000000 00000000 02000000 00000000
Fix pr32816. When using linkerscripts we were trying to sort SHF_LINK_ORDER sections too early. Instead of always doing two runs of assignAddresses, record the section order in processCommands. llvm-svn: 301830
2017-05-02 04:32:39 +08:00
.global _start
_start:
.section .text.bar,"a",@progbits
.quad 2
.section .text.foo,"a",@progbits
.quad 1
.section .rodata.foo,"ao",@progbits,.text.foo
.quad 1
.section .rodata.bar,"ao",@progbits,.text.bar
.quad 2