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i386: Compile rtld-*.os with -mno-sse -mno-mmx -mfpmath=387 

Compile i386 rtld-*.os with -mno-sse -mno-mmx -mfpmath=387 so that no
code in ld.so uses mm/xmm/ymm/zmm registers on i386 since the first 3
mm/xmm/ymm/zmm registers are used to pass vector parameters which must
be preserved.

	* sysdeps/i386/Makefile (rtld-CFLAGS): New.
	[subdir == elf] (CFLAGS-.os): Replace -mno-sse -mno-mmx
	-mfpmath=387 with $(rtld-CFLAGS).
	[subdir != elf] (CFLAGS-.os): Compile rtld-*.os with
	$(rtld-CFLAGS).
This commit is contained in:
H.J. Lu 2016-07-18 15:16:11 -07:00
parent 41d0365882
commit d957c4d3fa
2 changed files with 13 additions and 2 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2016-07-18 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/i386/Makefile (rtld-CFLAGS): New.
[subdir == elf] (CFLAGS-.os): Replace -mno-sse -mno-mmx
-mfpmath=387 with $(rtld-CFLAGS).
[subdir != elf] (CFLAGS-.os): Compile rtld-*.os with
$(rtld-CFLAGS).
2016-07-18 Ross Burton <ross.burton@intel.com>
Khem Raj <raj.khem@gmail.com>

7
sysdeps/i386/Makefile
View File

@ -84,17 +84,20 @@ ifeq ($(subdir),csu)
gen-as-const-headers += tlsdesc.sym
endif
ifeq ($(subdir),elf)
# Make sure no code in ld.so uses mm/xmm/ymm/zmm registers on i386 since
# the first 3 mm/xmm/ymm/zmm registers are used to pass vector parameters
# which must be preserved.
# With SSE disabled, ensure -fpmath is not set to use sse either.
rtld-CFLAGS = -mno-sse -mno-mmx -mfpmath=387
ifeq ($(subdir),elf)
CFLAGS-.os += $(if $(filter $(@F),$(patsubst %,%.os,$(all-rtld-routines))),\
-mno-sse -mno-mmx -mfpmath=387)
$(rtld-CFLAGS))
tests-special += $(objpfx)tst-ld-sse-use.out
$(objpfx)tst-ld-sse-use.out: ../sysdeps/i386/tst-ld-sse-use.sh $(objpfx)ld.so
@echo "Checking ld.so for SSE register use. This will take a few seconds..."
$(BASH) $< $(objpfx) '$(NM)' '$(OBJDUMP)' '$(READELF)' > $@; \
$(evaluate-test)
else
CFLAGS-.os += $(if $(filter rtld-%.os,$(@F)), $(rtld-CFLAGS))
endif