If explicit relocation hints are used by the toolchain, -Wa,-mla-*
options will be useless for the C code. So only use them for the
!CONFIG_AS_HAS_EXPLICIT_RELOCS case.
Replace "la" with "la.pcrel" in head.S to keep the semantic consistent
with new and old toolchains for the low level startup code.
For per-CPU variables, the "address" of the symbol is actually an offset
from $r21. The value is near the loading address of main kernel image,
but far from the loading address of modules. So we use model("extreme")
attibute to tell the compiler that a PC-relative addressing with 32-bit
offset is not sufficient for local per-CPU variables.
The behavior with different assemblers and compilers are summarized in
the following table:
AS has CC has
explicit relocs explicit relocs * Behavior
==============================================================
No No Use la.* macros.
No change from Linux 6.0.
--------------------------------------------------------------
No Yes Disable explicit relocs.
No change from Linux 6.0.
--------------------------------------------------------------
Yes No Not supported.
--------------------------------------------------------------
Yes Yes Enable explicit relocs.
No -Wa,-mla* options used.
==============================================================
*: We assume CC must have model attribute if it has explicit relocs.
Both features are added in GCC 13 development cycle, so any GCC
release >= 13 should be OK. Using early GCC 13 development snapshots
may produce modules with unsupported relocations.
Link: https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=f09482a
Link: https://gcc.gnu.org/r13-1834
Link: https://gcc.gnu.org/r13-2199
Tested-by: WANG Xuerui <git@xen0n.name>
Signed-off-by: Xi Ruoyao <xry111@xry111.site>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
- implement EFI boot support for LoongArch
- implement generic EFI compressed boot support for arm64, RISC-V and
LoongArch, none of which implement a decompressor today
- measure the kernel command line into the TPM if measured boot is in
effect
- refactor the EFI stub code in order to isolate DT dependencies for
architectures other than x86
- avoid calling SetVirtualAddressMap() on arm64 if the configured size
of the VA space guarantees that doing so is unnecessary
- move some ARM specific code out of the generic EFI source files
- unmap kernel code from the x86 mixed mode 1:1 page tables
-----BEGIN PGP SIGNATURE-----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=d8Ps
-----END PGP SIGNATURE-----
Merge tag 'efi-next-for-v6.1' into loongarch-next
LoongArch architecture changes for 6.1 depend on the efi changes to
work, so merge them to create a base.
This patch adds efistub booting support, which is the standard UEFI boot
protocol for LoongArch to use.
We use generic efistub, which means we can pass boot information (i.e.,
system table, memory map, kernel command line, initrd) via a light FDT
and drop a lot of non-standard code.
We use a flat mapping to map the efi runtime in the kernel's address
space. In efi, VA = PA; in kernel, VA = PA + PAGE_OFFSET. As a result,
flat mapping is not identity mapping, SetVirtualAddressMap() is still
needed for the efi runtime.
Tested-by: Xi Ruoyao <xry111@xry111.site>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
[ardb: change fpic to fpie as suggested by Xi Ruoyao]
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Ensure that all input sections are listed explicitly in the linker
script, and issue a warning otherwise. This ensures that the binary
image matches the PE/COFF and other image metadata exactly, which is
important for things like code signing.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
_stext means the start of .text section (see __is_kernel_text()), but we
put its definition in .ref.text by mistake. Fix it by defining it in the
vmlinux.lds.S.
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Commit c604abc3f6 ("vmlinux.lds.h: Split ELF_DETAILS from STABS_DEBUG")
splits ELF_DETAILS from STABS_DEBUG, resulting in missing ELF_DETAILS
information in LoongArch architecture, so add it.
Fixes: c604abc3f6 ("vmlinux.lds.h: Split ELF_DETAILS from STABS_DEBUG")
Signed-off-by: Youling Tang <tangyouling@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
LoongArch-based procesors have 4, 8 or 16 cores per package. This patch
adds multi-processor (SMP) support for LoongArch.
Reviewed-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Xi Ruoyao