68fa4e8c34
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
96 lines
3.7 KiB
ArmAsm
96 lines
3.7 KiB
ArmAsm
# REQUIRES: x86
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# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t.o
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# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %p/Inputs/keep.s -o %t1.o
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## First check that section "keep" is garbage collected without using KEEP
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# RUN: echo "SECTIONS { \
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# RUN: .text : { *(.text) } \
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# RUN: .keep : { *(.keep) } \
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# RUN: .temp : { *(.temp) }}" > %t.script
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# RUN: ld.lld --gc-sections -o %t --script %t.script %t.o
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# RUN: llvm-objdump -section-headers %t | \
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# RUN: FileCheck -check-prefix=SECGC %s
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# SECGC: Sections:
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# SECGC-NEXT: Idx Name Size
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# SECGC-NEXT: 0 00000000
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# SECGC-NEXT: 1 .text 00000007
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# SECGC-NEXT: 2 .temp 00000004
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## Now apply KEEP command to preserve the section.
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# RUN: echo "SECTIONS { \
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# RUN: .text : { *(.text) } \
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# RUN: .keep : { KEEP(*(.keep)) } \
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# RUN: .temp : { *(.temp) }}" > %t.script
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# RUN: ld.lld --gc-sections -o %t --script %t.script %t.o
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# RUN: llvm-objdump -section-headers %t | \
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# RUN: FileCheck -check-prefix=SECNOGC %s
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# SECNOGC: Sections:
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# SECNOGC-NEXT: Idx Name Size
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# SECNOGC-NEXT: 0 00000000
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# SECNOGC-NEXT: 1 .text 00000007
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# SECNOGC-NEXT: 2 .keep 00000004
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# SECNOGC-NEXT: 3 .temp 00000004
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## A section name matches two entries in the SECTIONS directive. The
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## first one doesn't have KEEP, the second one does. If section that have
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## KEEP is the first in order then section is NOT collected.
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# RUN: echo "SECTIONS { \
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# RUN: . = SIZEOF_HEADERS; \
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# RUN: .keep : { KEEP(*(.keep)) } \
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# RUN: .nokeep : { *(.keep) }}" > %t.script
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# RUN: ld.lld --gc-sections -o %t --script %t.script %t.o
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# RUN: llvm-objdump -section-headers %t | FileCheck -check-prefix=MIXED1 %s
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# MIXED1: Sections:
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# MIXED1-NEXT: Idx Name Size
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# MIXED1-NEXT: 0 00000000
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# MIXED1-NEXT: 1 .keep 00000004
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# MIXED1-NEXT: 2 .temp 00000004 00000000000000ec
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# MIXED1-NEXT: 3 .text 00000007 00000000000000f0
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# MIXED1-NEXT: 4 .comment 00000008 0000000000000000
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# MIXED1-NEXT: 5 .symtab 00000060 0000000000000000
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# MIXED1-NEXT: 6 .shstrtab 00000036 0000000000000000
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# MIXED1-NEXT: 7 .strtab 00000012 0000000000000000
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## The same, but now section without KEEP is at first place.
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## gold and bfd linkers disagree here. gold collects .keep while
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## bfd keeps it. Our current behavior is compatible with bfd although
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## we can choose either way.
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# RUN: echo "SECTIONS { \
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# RUN: . = SIZEOF_HEADERS; \
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# RUN: .nokeep : { *(.keep) } \
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# RUN: .keep : { KEEP(*(.keep)) }}" > %t.script
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# RUN: ld.lld --gc-sections -o %t --script %t.script %t.o
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# RUN: llvm-objdump -section-headers %t | FileCheck -check-prefix=MIXED2 %s
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# MIXED2: Sections:
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# MIXED2-NEXT: Idx Name Size
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# MIXED2-NEXT: 0 00000000
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# MIXED2-NEXT: 1 .nokeep 00000004 00000000000000e8
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# MIXED2-NEXT: 2 .temp 00000004 00000000000000ec
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# MIXED2-NEXT: 3 .text 00000007 00000000000000f0
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# MIXED2-NEXT: 4 .comment 00000008 0000000000000000
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# MIXED2-NEXT: 5 .symtab 00000060 0000000000000000
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# MIXED2-NEXT: 6 .shstrtab 00000038 0000000000000000
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# MIXED2-NEXT: 7 .strtab 00000012 0000000000000000
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# Check file pattern for kept sections.
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# RUN: echo "SECTIONS { \
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# RUN: . = SIZEOF_HEADERS; \
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# RUN: .keep : { KEEP(*1.o(.keep)) } \
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# RUN: }" > %t.script
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# RUN: ld.lld --gc-sections -o %t --script %t.script %t1.o %t.o
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# RUN: llvm-objdump -s %t | FileCheck -check-prefix=FILEMATCH %s
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# FILEMATCH: Contents of section .keep:
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# FILEMATCH-NEXT: 00e8 41414141 AAAA
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.global _start
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_start:
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mov temp, %eax
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.section .keep, "a"
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keep:
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.long 1
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.section .temp, "a"
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temp:
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.long 2
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