lld/test/ELF/linkerscript/header-alloc.test

# REQUIRES: x86
## Test ELF header and phdrs allocation. Also check that SIZEOF_HEADERS as a
## symbol value matches the post-layout address.

# RUN: rm -rf %t && split-file %s %t && cd %t
# RUN: llvm-mc -filetype=obj -triple=x86_64 a.s -o a.o

## Fits: . leaves enough room below the first alloc section, same page.
# RUN: ld.lld -T fit.t a.o -o fit
# RUN: llvm-readelf -ls fit | FileCheck %s --check-prefix=FIT

## After .text's alignment is applied, `min` is 4 bytes below headerSize => headers dropped.
# RUN: ld.lld -T nofit.t a.o -o nofit
# RUN: llvm-readelf -l nofit | FileCheck %s --check-prefix=NOFIT

## min is page-aligned, base = alignDown(min, page) = min, so min - base == 0
## and allocating would add a whole page => headers dropped.
# RUN: ld.lld -T page.t a.o -o page -z max-page-size=0x1000
# RUN: llvm-readelf -l page | FileCheck %s --check-prefix=NOFIT

## Explicit FILEHDR/PHDRS but headers cannot fit => error.
# RUN: not ld.lld -T explicit-nofit.t a.o 2>&1 | FileCheck %s --check-prefix=ERR

# ERR: error: could not allocate headers

# FIT:      Type           Offset   VirtAddr           PhysAddr           FileSiz  MemSiz   Flg Align
# FIT-NEXT: PHDR           0x000040 0x0000000000000040 0x0000000000000040 0x0000e0 0x0000e0 R   0x8
# FIT-NEXT: LOAD           0x000000 0x0000000000000000 0x0000000000000000 0x000120 0x000120 R   0x1000
# FIT-NEXT: LOAD           0x000120 0x0000000000000120 0x0000000000000120 0x000001 0x000001 R E 0x1000
# FIT:      0000000000000120 0 NOTYPE GLOBAL DEFAULT   1 _start
# FIT-NEXT: 0000000000000120 0 NOTYPE GLOBAL DEFAULT ABS _size

# NOFIT:     Type           Offset   VirtAddr           PhysAddr           FileSiz  MemSiz   Flg Align
# NOFIT-NEXT: LOAD
# NOFIT-NOT:  PHDR

#--- a.s
.globl _start
_start:
  ret

#--- fit.t
SECTIONS {
  . = SIZEOF_HEADERS;
  _size = SIZEOF_HEADERS;
  .text : { *(.text) }
}

#--- nofit.t
SECTIONS { . = SIZEOF_HEADERS - 4; .text : { *(.text) } }

#--- page.t
SECTIONS { . = 0x1000; .text : { *(.text) } }

#--- explicit-nofit.t
PHDRS { foobar PT_LOAD FILEHDR PHDRS; }
SECTIONS { .text : { *(.text) } : foobar }