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When the .eh_frame section is placed at a non-zero offset within its output section, the relocation value within .eh_frame are computed incorrectly. We had similar issue in .ARM.exidx section and it has been fixed already in https://reviews.llvm.org/D148033. While applying the relocation using S+A-P, the value of P (the location of the relocation) is getting wrong. P is: P = SecAddr + rel.offset, But SecAddr points to the starting address of the outputsection rather than the starting address of the eh frame section within that output section. This issue affects all targets which generates .eh_frame section. Hence fixing in all the corresponding targets it affecting.
55 lines
1.5 KiB
ArmAsm
55 lines
1.5 KiB
ArmAsm
// REQUIRES: arm
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// RUN: rm -rf %t && split-file %s %t && cd %t
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// RUN: llvm-mc -filetype=obj -triple=arm a.s -o a.o
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// RUN: ld.lld a.o -T eh-frame-non-zero-offset.t -o non-zero
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// RUN: llvm-readelf --program-headers --unwind --symbols -x .eh_frame non-zero | FileCheck --check-prefix=NONZERO %s
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// RUN: ld.lld a.o -T eh-frame-zero-offset.t -o zero
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// RUN: llvm-readelf --program-headers --unwind --symbols -x .eh_frame zero | FileCheck --check-prefix=ZERO %s
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// NONZERO: {{[0-9]+}}: 00000084 {{.*}} __eh_frame_start
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// NONZERO-NEXT: {{[0-9]+}}: 000000b0 {{.*}} __eh_frame_end
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// NONZERO: 0x00000084 10000000 00000000 017a5200 017c0e01
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// NONZERO-NEXT: 0x00000094 1b0c0d00 10000000 18000000 60ffffff
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// NONZERO-NEXT: 0x000000a4 04000000 00000000 00000000
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// ZERO: {{[0-9]+}}: 00000004 {{.*}} __eh_frame_start
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// ZERO-NEXT: {{[0-9]+}}: 00000030 {{.*}} __eh_frame_end
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// ZERO: 0x00000004 10000000 00000000 017a5200 017c0e01
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// ZERO-NEXT: 0x00000014 1b0c0d00 10000000 18000000 e0ffffff
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// ZERO-NEXT: 0x00000024 04000000 00000000 00000000
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//--- eh-frame-non-zero-offset.t
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SECTIONS {
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.text : { *(.text .text.*) }
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.eh_frame : {
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/* Padding within .eh_frame */
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. += 128;
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__eh_frame_start = .;
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*(.eh_frame) ;
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__eh_frame_end = .;
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}
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}
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//--- eh-frame-zero-offset.t
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SECTIONS {
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.text : { *(.text .text.*) }
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.eh_frame : {
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__eh_frame_start = .;
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*(.eh_frame) ;
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__eh_frame_end = .;
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}
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}
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//--- a.s
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.section .text.01, "ax",%progbits
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.global f1
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.type f1, %function
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f1:
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.cfi_startproc
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.cfi_sections .eh_frame
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.space 4
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.cfi_endproc
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