0edc8b59ab
When using `-no-pie` without a `SECTIONS` command, the linker uses the target's default image base. If `-Ttext=` or `--section-start` specifies an output section address below this base, the result is likely unintended. - With `--no-rosegment`, the PT_LOAD segment covering the ELF header cannot include `.text` if `.text`'s address is too low, causing an `error: output file too large`. - With default `--rosegment`: - If a read-only section (e.g., `.rodata`) exists, a similar `error: output file too large` occurs. - Without read-only sections, the PT_LOAD segment covering the ELF header and program headers includes no sections, which is unusual and likely undesired. This also causes non-ascending PT_LOAD `p_vaddr` values related to the PT_LOAD that overlaps with PT_PHDR (#138584). To prevent these issues, report an error if a section address is below the image base and suggest `--image-base`. This check also applies when `--image-base` is explicitly set but is skipped when a `SECTIONS` command is used. Pull Request: https://github.com/llvm/llvm-project/pull/140187
75 lines
3.1 KiB
ArmAsm
75 lines
3.1 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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## Show what regular output gives to us.
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# RUN: ld.lld %t.o -o %t1
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# RUN: llvm-readelf -S -l %t1 | FileCheck %s
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# CHECK: .rodata PROGBITS 0000000000200158 000158 000008
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# CHECK-NEXT: .text PROGBITS 0000000000201160 000160 000001
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# CHECK-NEXT: .aw PROGBITS 0000000000202161 000161 000008
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# CHECK-NEXT: .data PROGBITS 0000000000202169 000169 000008
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# CHECK-NEXT: .bss NOBITS 0000000000202171 000171 000008
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# CHECK: Type
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# CHECK-NEXT: PHDR
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# CHECK-NEXT: LOAD 0x000000 0x0000000000200000
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## If -Ttext is smaller than the image base (which defaults to 0x200000 for -no-pie),
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## the headers will still be allocated, but mapped at a higher address,
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## which may look strange.
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# RUN: ld.lld -Ttext 0x0 -Tdata 0x4000 -Tbss 0x8000 %t.o --noinhibit-exec -o %t2 2>&1 | FileCheck %s --check-prefix=LINK1
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# RUN: llvm-readelf -S -l %t2 | FileCheck %s --check-prefix=USER1
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# LINK1: warning: section '.text' address (0x0) is smaller than image base (0x200000); specify --image-base
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# LINK1-NEXT: warning: section '.data' address (0x4000) is smaller than image base (0x200000); specify --image-base
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# USER1: .text PROGBITS 0000000000000000 001000 000001
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# USER1-NEXT: .data PROGBITS 0000000000004000 002000 000008
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# USER1-NEXT: .bss NOBITS 0000000000008000 002008 000008
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# USER1-NEXT: .rodata PROGBITS 0000000000009008 002008 000008
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# USER1-NEXT: .aw PROGBITS 000000000000a010 002010 000008
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# USER1: Type
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# USER1-NEXT: PHDR 0x000040 0x0000000000200040
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# USER1-NEXT: LOAD 0x000000 0x0000000000200000
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# USER1-NEXT: LOAD 0x001000 0x0000000000000000
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## Specify --image-base to make program headers look normal.
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# RUN: ld.lld --image-base=0 -Ttext 0x1000 -Tdata 0x4000 -Tbss 0x8000 %t.o -o %t3
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# RUN: llvm-readelf -S -l %t3 | FileCheck %s --check-prefix=USER2
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# USER2: .text PROGBITS 0000000000001000 001000 000001
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# USER2-NEXT: .data PROGBITS 0000000000004000 002000 000008
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# USER2-NEXT: .bss NOBITS 0000000000008000 002008 000008
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# USER2-NEXT: .rodata PROGBITS 0000000000009008 002008 000008
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# USER2-NEXT: .aw PROGBITS 000000000000a010 002010 000008
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# USER2: Type
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# USER2-NEXT: PHDR 0x000040 0x0000000000000040
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# USER2-NEXT: LOAD 0x000000 0x0000000000000000
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# USER2-NEXT: LOAD 0x001000 0x0000000000001000
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## With .text well above 200000 we don't need to change the image base
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# RUN: ld.lld -Ttext 0x201000 -z separate-loadable-segments %t.o -o %t4
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# RUN: llvm-readelf -S -l %t4 | FileCheck %s --check-prefix=USER3
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# USER3: .text PROGBITS 0000000000201000 001000 000001
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# USER3-NEXT: .rodata PROGBITS 0000000000202000 002000 000008
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# USER3-NEXT: .aw PROGBITS 0000000000203000 003000 000008
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# USER3-NEXT: .data PROGBITS 0000000000203008 003008 000008
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# USER3-NEXT: .bss NOBITS 0000000000203010 003010 000008
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# USER3: Type
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# USER3-NEXT: PHDR 0x000040 0x0000000000200040
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# USER3-NEXT: LOAD 0x000000 0x0000000000200000
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# USER3-NEXT: LOAD 0x001000 0x0000000000201000
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.text
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.globl _start
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_start:
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nop
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.section .rodata,"a"
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.quad 0
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.section .aw,"aw"
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.quad 0
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.section .data,"aw"
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.quad 0
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.section .bss,"",@nobits
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.quad 0
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