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
50 lines
2.5 KiB
ArmAsm
50 lines
2.5 KiB
ArmAsm
# REQUIRES: x86
|
|
# RUN: llvm-mc -filetype=obj -triple=x86_64-linux %s -o %t.o
|
|
# RUN: echo "SECTIONS { .data 0x4000 : {*(.data)} .dynsym 0x2000 : {*(.dynsym)} .dynstr : {*(.dynstr)} }" > %t.script
|
|
# RUN: ld.lld --hash-style=sysv -o %t.so --script %t.script %t.o -shared
|
|
# RUN: llvm-objdump --section-headers %t.so | FileCheck %s
|
|
|
|
# Note: how the layout is done:
|
|
# we need to layout 2 segments, each contains sections:
|
|
# seg1: .data .dynamic
|
|
# seg2: .dynsym .dynstr .text .hash
|
|
# for each segment, we start from the first section, regardless
|
|
# whether it is an orphan or not (sections that are not listed in the
|
|
# linkerscript are orphans):
|
|
# for seg1, we assign address: .data(0x4000), .dynamic(0x4008)
|
|
# for seg2, we assign address: .dynsym(0x2000), .dynstr(0x2018) ...
|
|
# .dynsym is not an orphan, so we take address from script, we assign
|
|
# .dynstr current address cursor, which is the end # of .dynsym and so
|
|
# on for later sections.
|
|
|
|
# Also note, it is absolutely *illegal* to have section addresses of
|
|
# the same segment in none-increasing order, authors of linker scripts
|
|
# must take responsibility to make sure this does not happen.
|
|
|
|
# CHECK: Sections:
|
|
# CHECK-NEXT: Idx Name Size VMA Type
|
|
# CHECK-NEXT: 0 00000000 0000000000000000
|
|
# CHECK-NEXT: 1 .dynamic 00000060 0000000000000000
|
|
# CHECK-NEXT: 2 .data 00000008 0000000000004000
|
|
# CHECK-NEXT: 3 .dynsym 00000018 0000000000002000
|
|
# CHECK-NEXT: 4 .dynstr 00000001 0000000000002018
|
|
# CHECK-NEXT: 5 .hash 00000010 000000000000201c
|
|
# CHECK-NEXT: 6 .text 00000008 000000000000202c
|
|
|
|
# RUN: ld.lld -e 0 -o %t --script %t.script %t.o --fatal-warnings
|
|
# RUN: llvm-readelf -Sl %t | FileCheck %s --check-prefix=CHECK1
|
|
|
|
# CHECK1: Name Type Address Off Size ES Flg Lk Inf Al
|
|
# CHECK1-NEXT: NULL 0000000000000000 000000 000000 00 0 0 0
|
|
# CHECK1-NEXT: .text PROGBITS 0000000000000000 001000 000008 00 AX 0 0 4
|
|
# CHECK1-NEXT: .data PROGBITS 0000000000004000 002000 000008 00 WA 0 0 1
|
|
# CHECK1: Program Headers:
|
|
# CHECK1-NEXT: Type Offset VirtAddr PhysAddr FileSiz MemSiz Flg Align
|
|
# CHECK1-NEXT: LOAD 0x001000 0x0000000000000000 0x0000000000000000 0x000008 0x000008 R E 0x1000
|
|
# CHECK1-NEXT: LOAD 0x002000 0x0000000000004000 0x0000000000004000 0x000008 0x000008 RW 0x1000
|
|
|
|
.quad 0
|
|
.data
|
|
.quad 0
|
|
|