aad64e0a1c
Given a linker script that ends in
.some_sec { ...} ;
__stack_start = .;
. = . + 0x2000;
__stack_end = .;
lld would put orphan sections like .comment before __stack_end,
corrupting the intended meaning.
The reason we don't normally move orphans past assignments to . is to
avoid breaking
rx_sec : { *(rx_sec) }
. = ALIGN(0x1000);
/* The RW PT_LOAD starts here*/
but in this case, there is nothing after and it seems safer to put the
orphan section last. This seems to match bfd's behavior and is
convenient for writing linker scripts that care about the layout of
SHF_ALLOC sections, but not of any non SHF_ALLOC sections.
llvm-svn: 313646
58 lines
1.9 KiB
ArmAsm
58 lines
1.9 KiB
ArmAsm
# REQUIRES: x86
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# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
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# Test that .orphan_rx is placed after __stack_end. This matches bfd's
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# behavior when the orphan section is the last one.
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# RUN: echo "SECTIONS { \
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# RUN: __start_text = .; \
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# RUN: .text : { *(.text*) } \
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# RUN: __end_text = .; \
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# RUN: __stack_start = .; \
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# RUN: . = . + 0x1000; \
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# RUN: __stack_end = .; \
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# RUN: }" > %t.script
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# RUN: ld.lld -o %t --script %t.script %t.o
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# RUN: llvm-readelf -S --symbols %t | FileCheck %s
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# CHECK-DAG: .text PROGBITS 0000000000000000
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# CHECK-DAG: .orphan_rx PROGBITS 0000000000001004
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# CHECK-DAG: 0000000000000000 {{.*}} __start_text
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# CHECK-DAG: 0000000000000004 {{.*}} __end_text
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# CHECK-DAG: 0000000000000004 {{.*}} __stack_start
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# CHECK-DAG: 0000000000001004 {{.*}} __stack_end
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# Test that .orphan_rx is now placed before __stack_end. This matches bfd's
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# behavior when the orphan section is not the last one.
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# RUN: echo "SECTIONS { \
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# RUN: __start_text = .; \
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# RUN: .text : { *(.text*) } \
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# RUN: __end_text = .; \
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# RUN: __stack_start = .; \
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# RUN: . = . + 0x1000; \
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# RUN: __stack_end = .; \
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# RUN: .orphan_rw : { *(.orphan_rw*) } \
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# RUN: }" > %t.script
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# RUN: ld.lld -o %t --script %t.script %t.o
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# RUN: llvm-readelf -S --symbols %t | FileCheck --check-prefix=MIDDLE %s
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# MIDDLE-DAG: .text PROGBITS 0000000000000000
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# MIDDLE-DAG: .orphan_rx PROGBITS 0000000000000004
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# MIDDLE-DAG: 0000000000000000 {{.*}} __start_text
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# MIDDLE-DAG: 0000000000000004 {{.*}} __end_text
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# MIDDLE-DAG: 0000000000000004 {{.*}} __stack_start
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# MIDDLE-DAG: 0000000000001008 {{.*}} __stack_end
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.global _start
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_start:
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.zero 4
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.section .orphan_rx,"ax"
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.zero 4
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.section .orphan_rw,"aw"
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.zero 4
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