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xtensa: add kernel ABI selection to Kconfig

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Add choice to use default or call0 ABI for the kernel code. If call0 ABI
is chosen add '-mabi=call0' to the flags. The toolchain support for this
option is rather new so only enable it when the compiler supports it.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
This commit is contained in:
Max Filippov 2021-04-23 00:34:44 -07:00
parent 19c5699f9a
commit c20e1117d9
2 changed files with 39 additions and 0 deletions
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35
arch/xtensa/Kconfig
View File

@ -92,6 +92,9 @@ config CPU_BIG_ENDIAN
config CPU_LITTLE_ENDIAN
def_bool !CPU_BIG_ENDIAN
config CC_HAVE_CALL0_ABI
def_bool $(success,test "$(shell,echo __XTENSA_CALL0_ABI__ | $(CC) -mabi=call0 -E -P - 2>/dev/null)" = 1)
menu "Processor type and features"
choice
@ -250,6 +253,38 @@ config FAST_SYSCALL_SPILL_REGISTERS
If unsure, say N.
choice
prompt "Kernel ABI"
default KERNEL_ABI_DEFAULT
help
Select ABI for the kernel code. This ABI is independent of the
supported userspace ABI and any combination of the
kernel/userspace ABI is possible and should work.
In case both kernel and userspace support only call0 ABI
all register windows support code will be omitted from the
build.
If unsure, choose the default ABI.
config KERNEL_ABI_DEFAULT
bool "Default ABI"
help
Select this option to compile kernel code with the default ABI
selected for the toolchain.
Normally cores with windowed registers option use windowed ABI and
cores without it use call0 ABI.
config KERNEL_ABI_CALL0
bool "Call0 ABI" if CC_HAVE_CALL0_ABI
help
Select this option to compile kernel code with call0 ABI even with
toolchain that defaults to windowed ABI.
When this option is not selected the default toolchain ABI will
be used for the kernel code.
endchoice
config USER_ABI_CALL0
bool

4
arch/xtensa/Makefile
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@ -35,6 +35,10 @@ KBUILD_CFLAGS += -ffreestanding -D__linux__
KBUILD_CFLAGS += -pipe -mlongcalls -mtext-section-literals
KBUILD_CFLAGS += $(call cc-option,-mforce-no-pic,)
KBUILD_CFLAGS += $(call cc-option,-mno-serialize-volatile,)
ifneq ($(CONFIG_KERNEL_ABI_CALL0),)
KBUILD_CFLAGS += -mabi=call0
KBUILD_AFLAGS += -mabi=call0
endif
KBUILD_AFLAGS += -mlongcalls -mtext-section-literals