mirror of
https://gitlab.com/qemu-project/qboot.git
synced 2024-02-13 08:33:40 +08:00
a5300c4949
The switch to meson in commit fd2aada36b ("Add meson build") had two
major behavior changes for the ELF binary build step:
* ELF binary is no longer build as x86_64 on x86_64
* ELF binary is build as position independent executable on systems with a
"--enable-default-pie" gcc
The latter will create a slightly larger than 64KB bios.bin which causes an
error when Qemu tries to load it:
qemu: could not load PC BIOS 'qboot/build/bios.bin'
This behavior change was introduced because the elf linker step was changed
from using ld directly to using cc. Basically something like following
Makefile change:
bios.bin.elf: $(obj-y) flat.lds
- $(LD) -T flat.lds -o bios.bin.elf $(obj-y)
+ $(CC) -o bios.bin.elf $(obj-y) -Wl,--no-undefined -Wl,--as-needed -nostdlib -m32 -Wl,--build-id=none -Wl,-Tflat.lds
GCC will then take care of calling ld with the appropriate arguments. And
one of these arguments for the "--enable-default-pie" gcc is "-pie":
$(LD) --build-id --eh-frame-hdr -m elf_i386 --hash-style=gnu -dynamic-linker /lib/ld-linux.so.2 -pie -o bios.bin.elf $(obj-y) --no-undefined --as-needed --build-id=none -Tflat.lds
This default behavior of gcc must be suppressed by adding -no-pie to the
arguments when linking the object files.
Signed-off-by: Sven Eckelmann <sven@narfation.org>
54 lines
1.1 KiB
Meson
54 lines
1.1 KiB
Meson
project('qboot', 'c', meson_version: '>=0.49.0')
|
|
|
|
cc = meson.get_compiler('c')
|
|
objcopy = find_program('objcopy')
|
|
|
|
c_args = [
|
|
'-m32',
|
|
'-march=i386',
|
|
'-mregparm=3',
|
|
'-fno-stack-protector',
|
|
'-fno-delete-null-pointer-checks',
|
|
'-ffreestanding',
|
|
'-mstringop-strategy=rep_byte',
|
|
'-minline-all-stringops',
|
|
'-fno-pic',
|
|
]
|
|
|
|
link_args = ['-nostdlib', '-m32']
|
|
link_args += cc.get_supported_link_arguments('-Wl,--build-id=none')
|
|
link_args += '-Wl,-T' + meson.current_source_dir() / 'flat.lds'
|
|
link_args += cc.get_supported_link_arguments(['-no-pie'])
|
|
|
|
elf = executable(
|
|
'bios.bin.elf',
|
|
files(
|
|
'code16.c',
|
|
'code32seg.c',
|
|
'cstart.S',
|
|
'entry.S',
|
|
'fw_cfg.c',
|
|
'hwsetup.c',
|
|
'linuxboot.c',
|
|
'main.c',
|
|
'malloc.c',
|
|
'mptable.c',
|
|
'pci.c',
|
|
'printf.c',
|
|
'string.c',
|
|
'smbios.c',
|
|
'tables.c',
|
|
),
|
|
c_args: c_args,
|
|
include_directories: include_directories('include'),
|
|
link_args: link_args,
|
|
)
|
|
|
|
bin = custom_target(
|
|
'bios.bin',
|
|
output: 'bios.bin',
|
|
input: elf,
|
|
command: [objcopy, '-O', 'binary', '@INPUT@', '@OUTPUT@'],
|
|
build_by_default: true,
|
|
)
|