ec29538af2
* GNU ld places non-SHF_ALLOC sections after SHF_ALLOC sections. This has the advantage that the file offsets of a non-SHF_ALLOC cannot be contained in a PT_LOAD. This patch matches the behavior. * For non-SHF_ALLOC non-orphan sections, GNU ld may assign non-zero sh_addr and treat them similar to SHT_NOBITS (not advance location counter). This is an alternative approach to what we have done in D85100. By placing non-SHF_ALLOC sections at the end, we can drop special cases in createSection and findOrphanPos added by D85100. Different from GNU ld, we set sh_addr to 0 for non-SHF_ALLOC sections. 0 arguably is better because non-SHF_ALLOC sections don't appear in the memory image. ELF spec says: > sh_addr - If the section will appear in the memory image of a process, this > member gives the address at which the section's first byte should > reside. Otherwise, the member contains 0. D85100 appeared to take a detour. If we take a combined view on D85100 and this patch, the overall complexity slightly increases (one more 3-line loop) and compatibility with GNU ld improves. The behavior we don't want to match is the special treatment of .symtab .shstrtab .strtab: they can be matched in LLD but not in GNU ld. Reviewed By: jhenderson, psmith Differential Revision: https://reviews.llvm.org/D85867
107 lines
4.7 KiB
ArmAsm
107 lines
4.7 KiB
ArmAsm
# REQUIRES: x86
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# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t
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# Empty SECTIONS command.
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# RUN: echo "SECTIONS {}" > %t.script
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# RUN: ld.lld -o %t1 --script %t.script %t
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# RUN: llvm-objdump --section-headers %t1 | \
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# RUN: FileCheck -check-prefix=SEC-DEFAULT %s
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# SECTIONS command with the same order as default.
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# RUN: echo "SECTIONS { \
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# RUN: .text : { *(.text) } \
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# RUN: .data : { *(.data) } }" > %t.script
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# RUN: ld.lld -o %t2 --script %t.script %t
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# RUN: llvm-objdump --section-headers %t2 | \
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# RUN: FileCheck -check-prefix=SEC-DEFAULT %s
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# Idx Name Size
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# SEC-DEFAULT: 1 .text 0000000e {{[0-9a-f]*}} TEXT
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# SEC-DEFAULT: 2 .data 00000020 {{[0-9a-f]*}} DATA
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# SEC-DEFAULT: 3 other 00000003 {{[0-9a-f]*}} DATA
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# SEC-DEFAULT: 4 .bss 00000002 {{[0-9a-f]*}} BSS
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# SEC-DEFAULT: 5 .comment 00000008 {{[0-9a-f]*}}
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# SEC-DEFAULT: 6 .symtab 00000030 {{[0-9a-f]*}}
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# SEC-DEFAULT: 7 .shstrtab 0000003b {{[0-9a-f]*}}
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# SEC-DEFAULT: 8 .strtab 00000008 {{[0-9a-f]*}}
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# .text and .data have swapped names but proper sizes and types.
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# RUN: echo "SECTIONS { \
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# RUN: .data : { *(.text) } \
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# RUN: .text : { *(.data) } }" > %t.script
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# RUN: ld.lld -o %t4 --script %t.script %t
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# RUN: llvm-objdump --section-headers %t4 | \
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# RUN: FileCheck -check-prefix=SEC-SWAP-NAMES %s
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# Idx Name Size
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# SEC-SWAP-NAMES: 1 .data 0000000e {{[0-9a-f]*}} TEXT
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# SEC-SWAP-NAMES: 2 .text 00000020 {{[0-9a-f]*}} DATA
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# SEC-SWAP-NAMES: 3 other 00000003 {{[0-9a-f]*}} DATA
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# SEC-SWAP-NAMES: 4 .bss 00000002 {{[0-9a-f]*}} BSS
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# SEC-SWAP-NAMES: 5 .comment 00000008 {{[0-9a-f]*}}
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# SEC-SWAP-NAMES: 6 .symtab 00000030 {{[0-9a-f]*}}
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# SEC-SWAP-NAMES: 7 .shstrtab 0000003b {{[0-9a-f]*}}
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# SEC-SWAP-NAMES: 8 .strtab 00000008 {{[0-9a-f]*}}
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# Multiple SECTIONS command specifying additional input section descriptions
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# for the same output section description - input sections are merged into
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# one output section.
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# RUN: echo "SECTIONS { \
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# RUN: .text : { *(.text) } \
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# RUN: .data : { *(.data) } } \
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# RUN: SECTIONS { \
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# RUN: .data : { *(other) } }" > %t.script
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# RUN: ld.lld -o %t6 --script %t.script %t
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# RUN: llvm-objdump --section-headers %t6 | \
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# RUN: FileCheck -check-prefix=SEC-MULTI %s
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# Idx Name Size
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# SEC-MULTI: 1 .text 0000000e {{[0-9a-f]*}} TEXT
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# SEC-MULTI-NEXT: .data 00000020 {{[0-9a-f]*}} DATA
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# SEC-MULTI-NEXT: .data 00000003 {{[0-9a-f]*}} DATA
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# SEC-MULTI-NEXT: .bss 00000002 {{[0-9a-f]*}} BSS
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# SEC-MULTI-NEXT: .comment 00000008 {{[0-9a-f]*}}
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# SEC-MULTI-NEXT: .symtab 00000030 {{[0-9a-f]*}}
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# SEC-MULTI-NEXT: .shstrtab 00000035 {{[0-9a-f]*}}
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# SEC-MULTI-NEXT: .strtab 00000008 {{[0-9a-f]*}}
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## other is placed in a PT_LOAD segment even if it is preceded by a non-alloc section.
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## The current implementation places .data, .bss, .comment and other in the same PT_LOAD.
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# RUN: echo 'SECTIONS { \
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# RUN: .text : { *(.text) } \
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# RUN: .data : { *(.data) } \
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# RUN: .comment : { *(.comment) } \
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# RUN: other : { *(other) } }' > %t5.lds
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# RUN: ld.lld -o %t5 -T %t5.lds %t
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# RUN: llvm-readelf -S -l %t5 | FileCheck --check-prefix=SEP-BY-NONALLOC %s
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# SEP-BY-NONALLOC: [Nr] Name Type Address Off Size ES Flg
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# SEP-BY-NONALLOC: [ 1] .text PROGBITS 0000000000000000 001000 00000e 00 AX
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# SEP-BY-NONALLOC-NEXT: [ 2] .data PROGBITS 000000000000000e 00100e 000020 00 WA
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# SEP-BY-NONALLOC-NEXT: [ 3] .bss NOBITS 000000000000002e 00102e 000002 00 WA
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# SEP-BY-NONALLOC-NEXT: [ 4] .comment PROGBITS 0000000000000000 001033 000008 01 MS
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# SEP-BY-NONALLOC: [ 8] other PROGBITS 0000000000000030 001030 000003 00 WA
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# SEP-BY-NONALLOC: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
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# SEP-BY-NONALLOC-NEXT: LOAD 0x001000 0x0000000000000000 0x0000000000000000 0x00000e 0x00000e R E 0x1000
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# SEP-BY-NONALLOC-NEXT: LOAD 0x00100e 0x000000000000000e 0x000000000000000e 0x000025 0x000025 RW 0x1000
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# SEP-BY-NONALLOC-NEXT: GNU_STACK 0x000000 0x0000000000000000 0x0000000000000000 0x000000 0x000000 RW 0
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# Input section pattern contains additional semicolon.
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# Case found in linux kernel script. Check we are able to parse it.
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# RUN: echo "SECTIONS { .text : { ;;*(.text);;S = 0;; } }" > %t.script
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# RUN: ld.lld -o /dev/null --script %t.script %t
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.globl _start
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_start:
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mov $60, %rax
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mov $42, %rdi
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.section .data,"aw"
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.quad 10, 10, 20, 20
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.section other,"aw"
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.short 10
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.byte 20
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.section .bss,"",@nobits
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.short 0
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