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Enable 'C'-compressed ISA extension.

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This was disabled recently due to lack of support in KDB disassembler
and DTrace FBT provider. Support for 'C'-extension to both of these was
added, so we can now enable 'C'-extension.

This reduces size of the kernel important for low-end embedded devices,
and saves cache footprint for high perfomance machines.

Approved by:	re (kib)
Sponsored by:	DARPA, AFRL
This commit is contained in:
Ruslan Bukin 2018-09-03 14:43:16 +00:00
parent 378a495661
commit 888c8381ad
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=338445
3 changed files with 4 additions and 4 deletions
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4
share/mk/bsd.cpu.mk
View File

@ -367,9 +367,9 @@ CFLAGS += -mcpu=8540 -Wa,-me500 -mspe=yes -mabi=spe -mfloat-gprs=double
.if ${MACHINE_CPUARCH} == "riscv"
.if ${MACHINE_ARCH:Mriscv*sf}
CFLAGS += -march=rv64ima -mabi=lp64
CFLAGS += -march=rv64imac -mabi=lp64
.else
CFLAGS += -march=rv64imafd -mabi=lp64d
CFLAGS += -march=rv64imafdc -mabi=lp64d
.endif
.endif

2
stand/defs.mk
View File

@ -108,7 +108,7 @@ CFLAGS+= -ffreestanding ${CFLAGS_NO_SIMD}
.if ${MACHINE_CPUARCH} == "aarch64"
CFLAGS+= -mgeneral-regs-only -fPIC
.elif ${MACHINE_CPUARCH} == "riscv"
CFLAGS+= -march=rv64ima -mabi=lp64
CFLAGS+= -march=rv64imac -mabi=lp64
.else
CFLAGS+= -msoft-float
.endif

2
sys/conf/kern.mk
View File

@ -131,7 +131,7 @@ INLINE_LIMIT?= 8000
.endif
.if ${MACHINE_CPUARCH} == "riscv"
CFLAGS.gcc+= -mcmodel=medany -march=rv64imafd -mabi=lp64
CFLAGS.gcc+= -mcmodel=medany -march=rv64imafdc -mabi=lp64
INLINE_LIMIT?= 8000
.endif