7c426fb1a6
D43468+D44380 added INSERT [AFTER|BEFORE] for non-orphan sections. This patch
makes INSERT work for orphan sections as well.
`SECTIONS {...} INSERT [AFTER|BEFORE] .foo` does not set `hasSectionCommands`, so the result
will be similar to a regular link without a linker script. The differences when `hasSectionCommands` is set include:
* image base is different
* -z noseparate-code/-z noseparate-loadable-segments are unavailable
* some special symbols such as `_end _etext _edata` are not defined
The behavior is similar to GNU ld:
INSERT is not considered an external linker script.
This feature makes the section layout more flexible. It can be used to:
* Place .nv_fatbin before other readonly SHT_PROGBITS sections to mitigate relocation overflows.
* Disturb the layout to expose address sensitive application bugs.
Reviewed By: grimar
Differential Revision: https://reviews.llvm.org/D74375
33 lines
1.3 KiB
Plaintext
33 lines
1.3 KiB
Plaintext
# REQUIRES: x86
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## Test that we can handle cases where an output section is specified by multiple
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## INSERT commands. Each output section description creates a new instance.
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## A redundant description matches no input sections and thus is a no-op.
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# RUN: llvm-mc -filetype=obj -triple=x86_64 %p/Inputs/insert-after.s -o %t.o
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# RUN: ld.lld -T %s %t.o -o %t
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# RUN: llvm-readelf -S -l %t | FileCheck %s
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# CHECK: Name Type Address Off
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# CHECK-NEXT: NULL 0000000000000000 000000
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# CHECK-NEXT: .text PROGBITS 00000000002011c8 0001c8
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# CHECK-NEXT: .foo.data PROGBITS 00000000002021d0 0001d0
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# CHECK-NEXT: .foo.text PROGBITS 00000000002031d8 0001d8
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# CHECK: Type
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# CHECK-NEXT: PHDR {{.*}} R
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# CHECK-NEXT: LOAD {{.*}} R
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# CHECK-NEXT: LOAD {{.*}} R E
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# CHECK-NEXT: LOAD {{.*}} RW
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# CHECK-NEXT: LOAD {{.*}} R E
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# CHECK-NEXT: LOAD {{.*}} RW
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# CHECK-NEXT: GNU_STACK {{.*}} RW
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## First, move .foo.data after .foo.text
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SECTIONS { .foo.data : { *(.foo.data) } } INSERT AFTER .foo.text;
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## Next, move .foo.text after .foo.data
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SECTIONS { .foo.text : { *(.foo.text) } } INSERT AFTER .foo.data;
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## No-op. The .foo.data output section is a different instance and matches no
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## input sections.
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SECTIONS { .foo.data : { *(.foo.data) } } INSERT AFTER .foo.text;
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