runtime: implement cheaper context switch on Linux/AMD64
Currently, goroutine switches are implemented with libc
getcontext/setcontext functions, which saves/restores the machine
register states and also the signal context. This does more than
what we need, and performs an expensive syscall.
This CL implements a simplified version of getcontext/setcontext,
in assembly, that only saves/restores the necessary part, i.e.
the callee-save registers, and the PC, SP. A simplified version
of makecontext, written in C, is also added. Currently this is
only implemented on Linux/AMD64.
Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/178298
From-SVN: r271818
This commit is contained in:
Ian Lance Taylor
parent
34a13a521e
commit
4d12cf3cc3
@ -1,4 +1,4 @@
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4dc60d989293d070702024e7dea52b9849f74775
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8402f6ac021ba20163ab4fcdb10ab7bb642de6dc
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The first line of this file holds the git revision number of the last
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merge done from the gofrontend repository.
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@ -481,6 +481,7 @@ runtime_files = \
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runtime/runtime_c.c \
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runtime/stack.c \
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runtime/yield.c \
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runtime/go-context.S \
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$(rtems_task_variable_add_file) \
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$(runtime_getncpu_file)
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@ -253,7 +253,8 @@ am__objects_3 = runtime/aeshash.lo runtime/go-assert.lo \
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runtime/go-unwind.lo runtime/go-varargs.lo \
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runtime/env_posix.lo runtime/panic.lo runtime/print.lo \
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runtime/proc.lo runtime/runtime_c.lo runtime/stack.lo \
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runtime/yield.lo $(am__objects_1) $(am__objects_2)
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runtime/yield.lo runtime/go-context.lo $(am__objects_1) \
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$(am__objects_2)
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am_libgo_llgo_la_OBJECTS = $(am__objects_3)
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libgo_llgo_la_OBJECTS = $(am_libgo_llgo_la_OBJECTS)
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AM_V_lt = $(am__v_lt_@AM_V@)
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@ -287,6 +288,16 @@ DEFAULT_INCLUDES = -I.@am__isrc@
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depcomp = $(SHELL) $(top_srcdir)/../depcomp
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am__depfiles_maybe = depfiles
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am__mv = mv -f
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CPPASCOMPILE = $(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
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$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CCASFLAGS) $(CCASFLAGS)
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LTCPPASCOMPILE = $(LIBTOOL) $(AM_V_lt) $(AM_LIBTOOLFLAGS) \
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$(LIBTOOLFLAGS) --mode=compile $(CCAS) $(DEFS) \
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$(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) \
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$(AM_CCASFLAGS) $(CCASFLAGS)
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AM_V_CPPAS = $(am__v_CPPAS_@AM_V@)
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am__v_CPPAS_ = $(am__v_CPPAS_@AM_DEFAULT_V@)
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am__v_CPPAS_0 = @echo " CPPAS " $@;
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am__v_CPPAS_1 =
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COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
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$(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
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LTCOMPILE = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
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@ -380,6 +391,9 @@ AUTOHEADER = @AUTOHEADER@
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AUTOMAKE = @AUTOMAKE@
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AWK = @AWK@
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CC = @CC@
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CCAS = @CCAS@
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CCASDEPMODE = @CCASDEPMODE@
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CCASFLAGS = @CCASFLAGS@
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CCDEPMODE = @CCDEPMODE@
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CC_FOR_BUILD = @CC_FOR_BUILD@
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CFLAGS = @CFLAGS@
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@ -512,6 +526,7 @@ pdfdir = @pdfdir@
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prefix = @prefix@
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program_transform_name = @program_transform_name@
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psdir = @psdir@
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runstatedir = @runstatedir@
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sbindir = @sbindir@
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sharedstatedir = @sharedstatedir@
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srcdir = @srcdir@
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@ -901,6 +916,7 @@ runtime_files = \
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runtime/runtime_c.c \
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runtime/stack.c \
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runtime/yield.c \
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runtime/go-context.S \
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$(rtems_task_variable_add_file) \
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$(runtime_getncpu_file)
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@ -1158,7 +1174,7 @@ all: config.h
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$(MAKE) $(AM_MAKEFLAGS) all-recursive
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.SUFFIXES:
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.SUFFIXES: .c .go .gox .o .obj .lo .a
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.SUFFIXES: .c .go .gox .o .obj .lo .a .S
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am--refresh: Makefile
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@:
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$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am $(top_srcdir)/../multilib.am $(am__configure_deps)
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@ -1375,6 +1391,8 @@ runtime/stack.lo: runtime/$(am__dirstamp) \
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runtime/$(DEPDIR)/$(am__dirstamp)
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runtime/yield.lo: runtime/$(am__dirstamp) \
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runtime/$(DEPDIR)/$(am__dirstamp)
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runtime/go-context.lo: runtime/$(am__dirstamp) \
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runtime/$(DEPDIR)/$(am__dirstamp)
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runtime/rtems-task-variable-add.lo: runtime/$(am__dirstamp) \
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runtime/$(DEPDIR)/$(am__dirstamp)
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runtime/getncpu-none.lo: runtime/$(am__dirstamp) \
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@ -1421,6 +1439,7 @@ distclean-compile:
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@AMDEP_TRUE@@am__include@ @am__quote@runtime/$(DEPDIR)/go-cdiv.Plo@am__quote@
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@AMDEP_TRUE@@am__include@ @am__quote@runtime/$(DEPDIR)/go-cgo.Plo@am__quote@
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@AMDEP_TRUE@@am__include@ @am__quote@runtime/$(DEPDIR)/go-construct-map.Plo@am__quote@
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@AMDEP_TRUE@@am__include@ @am__quote@runtime/$(DEPDIR)/go-context.Plo@am__quote@
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@AMDEP_TRUE@@am__include@ @am__quote@runtime/$(DEPDIR)/go-ffi.Plo@am__quote@
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@AMDEP_TRUE@@am__include@ @am__quote@runtime/$(DEPDIR)/go-fieldtrack.Plo@am__quote@
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@AMDEP_TRUE@@am__include@ @am__quote@runtime/$(DEPDIR)/go-matherr.Plo@am__quote@
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@ -1451,6 +1470,30 @@ distclean-compile:
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@AMDEP_TRUE@@am__include@ @am__quote@runtime/$(DEPDIR)/stack.Plo@am__quote@
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@AMDEP_TRUE@@am__include@ @am__quote@runtime/$(DEPDIR)/yield.Plo@am__quote@
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.S.o:
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@am__fastdepCCAS_TRUE@ $(AM_V_CPPAS)depbase=`echo $@ | sed 's|[^/]*$$|$(DEPDIR)/&|;s|\.o$$||'`;\
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@am__fastdepCCAS_TRUE@ $(CPPASCOMPILE) -MT $@ -MD -MP -MF $$depbase.Tpo -c -o $@ $< &&\
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@am__fastdepCCAS_TRUE@ $(am__mv) $$depbase.Tpo $$depbase.Po
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@AMDEP_TRUE@@am__fastdepCCAS_FALSE@ $(AM_V_CPPAS)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
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@AMDEP_TRUE@@am__fastdepCCAS_FALSE@ DEPDIR=$(DEPDIR) $(CCASDEPMODE) $(depcomp) @AMDEPBACKSLASH@
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@am__fastdepCCAS_FALSE@ $(AM_V_CPPAS@am__nodep@)$(CPPASCOMPILE) -c -o $@ $<
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.S.obj:
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@am__fastdepCCAS_TRUE@ $(AM_V_CPPAS)depbase=`echo $@ | sed 's|[^/]*$$|$(DEPDIR)/&|;s|\.obj$$||'`;\
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@am__fastdepCCAS_TRUE@ $(CPPASCOMPILE) -MT $@ -MD -MP -MF $$depbase.Tpo -c -o $@ `$(CYGPATH_W) '$<'` &&\
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@am__fastdepCCAS_TRUE@ $(am__mv) $$depbase.Tpo $$depbase.Po
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@AMDEP_TRUE@@am__fastdepCCAS_FALSE@ $(AM_V_CPPAS)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
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@AMDEP_TRUE@@am__fastdepCCAS_FALSE@ DEPDIR=$(DEPDIR) $(CCASDEPMODE) $(depcomp) @AMDEPBACKSLASH@
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@am__fastdepCCAS_FALSE@ $(AM_V_CPPAS@am__nodep@)$(CPPASCOMPILE) -c -o $@ `$(CYGPATH_W) '$<'`
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.S.lo:
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@am__fastdepCCAS_TRUE@ $(AM_V_CPPAS)depbase=`echo $@ | sed 's|[^/]*$$|$(DEPDIR)/&|;s|\.lo$$||'`;\
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@am__fastdepCCAS_TRUE@ $(LTCPPASCOMPILE) -MT $@ -MD -MP -MF $$depbase.Tpo -c -o $@ $< &&\
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@AMDEP_TRUE@@am__fastdepCCAS_FALSE@ $(AM_V_CPPAS)source='$<' object='$@' libtool=yes @AMDEPBACKSLASH@
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@AMDEP_TRUE@@am__fastdepCCAS_FALSE@ DEPDIR=$(DEPDIR) $(CCASDEPMODE) $(depcomp) @AMDEPBACKSLASH@
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@am__fastdepCCAS_FALSE@ $(AM_V_CPPAS@am__nodep@)$(LTCPPASCOMPILE) -c -o $@ $<
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@am__fastdepCC_TRUE@ $(AM_V_CC)depbase=`echo $@ | sed 's|[^/]*$$|$(DEPDIR)/&|;s|\.o$$||'`;\
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@am__fastdepCC_TRUE@ $(COMPILE) -MT $@ -MD -MP -MF $$depbase.Tpo -c -o $@ $< &&\
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vendored
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libgo/aclocal.m4
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[m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
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_AM_AUTOCONF_VERSION(m4_defn([AC_AUTOCONF_VERSION]))])
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# Figure out how to run the assembler. -*- Autoconf -*-
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# Copyright (C) 2001-2017 Free Software Foundation, Inc.
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#
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# This file is free software; the Free Software Foundation
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# gives unlimited permission to copy and/or distribute it,
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# with or without modifications, as long as this notice is preserved.
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# AM_PROG_AS
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# ----------
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AC_DEFUN([AM_PROG_AS],
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[# By default we simply use the C compiler to build assembly code.
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AC_REQUIRE([AC_PROG_CC])
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test "${CCAS+set}" = set || CCAS=$CC
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test "${CCASFLAGS+set}" = set || CCASFLAGS=$CFLAGS
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AC_ARG_VAR([CCAS], [assembler compiler command (defaults to CC)])
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AC_ARG_VAR([CCASFLAGS], [assembler compiler flags (defaults to CFLAGS)])
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_AM_IF_OPTION([no-dependencies],, [_AM_DEPENDENCIES([CCAS])])dnl
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])
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# AM_AUX_DIR_EXPAND -*- Autoconf -*-
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# Copyright (C) 2001-2017 Free Software Foundation, Inc.
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libgo/configure
vendored
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@ -729,6 +729,11 @@ SED
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MAINT
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MAINTAINER_MODE_FALSE
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MAINTAINER_MODE_TRUE
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am__fastdepCCAS_FALSE
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am__fastdepCCAS_TRUE
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CCASDEPMODE
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CCASFLAGS
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CCAS
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GOFLAGS
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GOC
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am__fastdepCC_FALSE
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@ -808,6 +813,7 @@ infodir
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docdir
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oldincludedir
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includedir
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runstatedir
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localstatedir
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sharedstatedir
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sysconfdir
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@ -889,6 +895,7 @@ datadir='${datarootdir}'
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sysconfdir='${prefix}/etc'
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sharedstatedir='${prefix}/com'
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localstatedir='${prefix}/var'
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runstatedir='${localstatedir}/run'
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includedir='${prefix}/include'
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oldincludedir='/usr/include'
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docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
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@ -1141,6 +1148,15 @@ do
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| -silent | --silent | --silen | --sile | --sil)
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silent=yes ;;
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-runstatedir | --runstatedir | --runstatedi | --runstated \
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| --runstate | --runstat | --runsta | --runst | --runs \
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| --run | --ru | --r)
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ac_prev=runstatedir ;;
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-runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
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| --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
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runstatedir=$ac_optarg ;;
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-sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
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ac_prev=sbindir ;;
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-sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
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@ -1278,7 +1294,7 @@ fi
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for ac_var in exec_prefix prefix bindir sbindir libexecdir datarootdir \
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datadir sysconfdir sharedstatedir localstatedir includedir \
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oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
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libdir localedir mandir
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libdir localedir mandir runstatedir
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do
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eval ac_val=\$$ac_var
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# Remove trailing slashes.
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--sysconfdir=DIR read-only single-machine data [PREFIX/etc]
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--sharedstatedir=DIR modifiable architecture-independent data [PREFIX/com]
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--localstatedir=DIR modifiable single-machine data [PREFIX/var]
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--runstatedir=DIR modifiable per-process data [LOCALSTATEDIR/run]
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--libdir=DIR object code libraries [EPREFIX/lib]
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--includedir=DIR C header files [PREFIX/include]
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--oldincludedir=DIR C header files for non-gcc [/usr/include]
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you have headers in a nonstandard directory <include dir>
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GOC Go compiler command
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GOFLAGS Go compiler flags
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CCAS assembler compiler command (defaults to CC)
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CCASFLAGS assembler compiler flags (defaults to CFLAGS)
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CPP C preprocessor
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Use these variables to override the choices made by `configure' or to help
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@ -4556,6 +4575,139 @@ ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
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ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
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ac_compiler_gnu=$ac_cv_c_compiler_gnu
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# By default we simply use the C compiler to build assembly code.
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test "${CCAS+set}" = set || CCAS=$CC
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test "${CCASFLAGS+set}" = set || CCASFLAGS=$CFLAGS
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depcc="$CCAS" am_compiler_list=
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking dependency style of $depcc" >&5
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$as_echo_n "checking dependency style of $depcc... " >&6; }
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if ${am_cv_CCAS_dependencies_compiler_type+:} false; then :
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$as_echo_n "(cached) " >&6
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if test -z "$AMDEP_TRUE" && test -f "$am_depcomp"; then
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# We make a subdir and do the tests there. Otherwise we can end up
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# making bogus files that we don't know about and never remove. For
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# instance it was reported that on HP-UX the gcc test will end up
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# making a dummy file named 'D' -- because '-MD' means "put the output
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# in D".
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rm -rf conftest.dir
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mkdir conftest.dir
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cp "$am_depcomp" conftest.dir
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cd conftest.dir
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# it helps to detect inapplicable dependency modes. For instance
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# both Tru64's cc and ICC support -MD to output dependencies as a
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# side effect of compilation, but ICC will put the dependencies in
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# the current directory while Tru64 will put them in the object
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# directory.
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if test "$am_compiler_list" = ""; then
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for depmode in $am_compiler_list; do
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# Setup a source with many dependencies, because some compilers
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# like to wrap large dependency lists on column 80 (with \), and
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# we should not choose a depcomp mode which is confused by this.
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#
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# We need to recreate these files for each test, as the compiler may
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# overwrite some of them when testing with obscure command lines.
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# This happens at least with the AIX C compiler.
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: > sub/conftest.c
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for i in 1 2 3 4 5 6; do
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echo '#include "conftst'$i'.h"' >> sub/conftest.c
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# Using ": > sub/conftst$i.h" creates only sub/conftst1.h with
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# Solaris 10 /bin/sh.
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echo '/* dummy */' > sub/conftst$i.h
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# We check with '-c' and '-o' for the sake of the "dashmstdout"
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# mode. It turns out that the SunPro C++ compiler does not properly
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# handle '-M -o', and we need to detect this. Also, some Intel
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gcc)
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# This depmode causes a compiler race in universal mode.
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test "$am__universal" = false || continue
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;;
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nosideeffect)
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# After this tag, mechanisms are not by side-effect, so they'll
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# only be used when explicitly requested.
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if test "x$enable_dependency_tracking" = xyes; then
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continue
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break
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fi
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;;
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msvc7 | msvc7msys | msvisualcpp | msvcmsys)
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# This compiler won't grok '-c -o', but also, the minuso test has
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# not run yet. These depmodes are late enough in the game, and
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# so weak that their functioning should not be impacted.
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am__obj=conftest.${OBJEXT-o}
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;;
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none) break ;;
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esac
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if depmode=$depmode \
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source=sub/conftest.c object=$am__obj \
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depfile=sub/conftest.Po tmpdepfile=sub/conftest.TPo \
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$SHELL ./depcomp $depcc -c $am__minus_obj sub/conftest.c \
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>/dev/null 2>conftest.err &&
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grep sub/conftst1.h sub/conftest.Po > /dev/null 2>&1 &&
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grep sub/conftst6.h sub/conftest.Po > /dev/null 2>&1 &&
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grep $am__obj sub/conftest.Po > /dev/null 2>&1 &&
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${MAKE-make} -s -f confmf > /dev/null 2>&1; then
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# icc doesn't choke on unknown options, it will just issue warnings
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# or remarks (even with -Werror). So we grep stderr for any message
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# that says an option was ignored or not supported.
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# When given -MP, icc 7.0 and 7.1 complain thusly:
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# icc: Command line warning: ignoring option '-M'; no argument required
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# The diagnosis changed in icc 8.0:
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# icc: Command line remark: option '-MP' not supported
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if (grep 'ignoring option' conftest.err ||
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grep 'not supported' conftest.err) >/dev/null 2>&1; then :; else
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break
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fi
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fi
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done
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cd ..
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else
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fi
|
||||
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $am_cv_CCAS_dependencies_compiler_type" >&5
|
||||
$as_echo "$am_cv_CCAS_dependencies_compiler_type" >&6; }
|
||||
CCASDEPMODE=depmode=$am_cv_CCAS_dependencies_compiler_type
|
||||
|
||||
if
|
||||
test "x$enable_dependency_tracking" != xno \
|
||||
&& test "$am_cv_CCAS_dependencies_compiler_type" = gcc3; then
|
||||
am__fastdepCCAS_TRUE=
|
||||
am__fastdepCCAS_FALSE='#'
|
||||
else
|
||||
am__fastdepCCAS_TRUE='#'
|
||||
am__fastdepCCAS_FALSE=
|
||||
fi
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
@ -11344,7 +11496,7 @@ else
|
||||
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
|
||||
lt_status=$lt_dlunknown
|
||||
cat > conftest.$ac_ext <<_LT_EOF
|
||||
#line 11347 "configure"
|
||||
#line 11499 "configure"
|
||||
#include "confdefs.h"
|
||||
|
||||
#if HAVE_DLFCN_H
|
||||
@ -11450,7 +11602,7 @@ else
|
||||
lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
|
||||
lt_status=$lt_dlunknown
|
||||
cat > conftest.$ac_ext <<_LT_EOF
|
||||
#line 11453 "configure"
|
||||
#line 11605 "configure"
|
||||
#include "confdefs.h"
|
||||
|
||||
#if HAVE_DLFCN_H
|
||||
@ -15838,6 +15990,10 @@ if test -z "${am__fastdepCC_TRUE}" && test -z "${am__fastdepCC_FALSE}"; then
|
||||
as_fn_error $? "conditional \"am__fastdepCC\" was never defined.
|
||||
Usually this means the macro was only invoked conditionally." "$LINENO" 5
|
||||
fi
|
||||
if test -z "${am__fastdepCCAS_TRUE}" && test -z "${am__fastdepCCAS_FALSE}"; then
|
||||
as_fn_error $? "conditional \"am__fastdepCCAS\" was never defined.
|
||||
Usually this means the macro was only invoked conditionally." "$LINENO" 5
|
||||
fi
|
||||
if test -z "${MAINTAINER_MODE_TRUE}" && test -z "${MAINTAINER_MODE_FALSE}"; then
|
||||
as_fn_error $? "conditional \"MAINTAINER_MODE\" was never defined.
|
||||
Usually this means the macro was only invoked conditionally." "$LINENO" 5
|
||||
|
||||
@ -26,6 +26,7 @@ m4_rename([_AC_ARG_VAR_PRECIOUS],[glibgo_PRECIOUS])
|
||||
m4_define([_AC_ARG_VAR_PRECIOUS],[])
|
||||
AC_PROG_CC
|
||||
AC_PROG_GO
|
||||
AM_PROG_AS
|
||||
m4_rename_force([glibgo_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
|
||||
|
||||
AC_SUBST(CFLAGS)
|
||||
|
||||
69
libgo/runtime/go-context.S
Normal file
69
libgo/runtime/go-context.S
Normal file
@ -0,0 +1,69 @@
|
||||
// Copyright 2019 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// This provides a simplified version of getcontext and
|
||||
// setcontext. They are like the corresponding functions
|
||||
// in libc, but we only save/restore the callee-save
|
||||
// registers and PC, SP. Unlike the libc functions, we
|
||||
// don't save/restore the signal masks and floating point
|
||||
// environment.
|
||||
|
||||
#if defined(__x86_64__) && defined(__linux__) && !defined(__CET__)
|
||||
|
||||
#define RBP_OFF (0*8)
|
||||
#define RBX_OFF (1*8)
|
||||
#define R12_OFF (2*8)
|
||||
#define R13_OFF (3*8)
|
||||
#define R14_OFF (4*8)
|
||||
#define R15_OFF (5*8)
|
||||
#define SP_OFF (6*8)
|
||||
#define PC_OFF (7*8)
|
||||
|
||||
.globl __go_getcontext
|
||||
.text
|
||||
__go_getcontext:
|
||||
movq %rbx, RBX_OFF(%rdi)
|
||||
movq %rbp, RBP_OFF(%rdi)
|
||||
movq %r12, R12_OFF(%rdi)
|
||||
movq %r13, R13_OFF(%rdi)
|
||||
movq %r14, R14_OFF(%rdi)
|
||||
movq %r15, R15_OFF(%rdi)
|
||||
|
||||
movq (%rsp), %rax // return PC
|
||||
movq %rax, PC_OFF(%rdi)
|
||||
leaq 8(%rsp), %rax // the SP before pushing return PC
|
||||
movq %rax, SP_OFF(%rdi)
|
||||
|
||||
ret
|
||||
|
||||
.globl __go_setcontext
|
||||
.text
|
||||
__go_setcontext:
|
||||
movq RBX_OFF(%rdi), %rbx
|
||||
movq RBP_OFF(%rdi), %rbp
|
||||
movq R12_OFF(%rdi), %r12
|
||||
movq R13_OFF(%rdi), %r13
|
||||
movq R14_OFF(%rdi), %r14
|
||||
movq R15_OFF(%rdi), %r15
|
||||
movq SP_OFF(%rdi), %rsp
|
||||
movq PC_OFF(%rdi), %rdx
|
||||
|
||||
jmp *%rdx
|
||||
|
||||
.globl __go_makecontext
|
||||
.text
|
||||
__go_makecontext:
|
||||
addq %rcx, %rdx
|
||||
|
||||
// Align the SP, and push a dummy return address.
|
||||
andq $~0xfULL, %rdx
|
||||
subq $8, %rdx
|
||||
movq $0, (%rdx)
|
||||
|
||||
movq %rdx, SP_OFF(%rdi)
|
||||
movq %rsi, PC_OFF(%rdi)
|
||||
|
||||
ret
|
||||
|
||||
#endif
|
||||
@ -75,7 +75,7 @@ initcontext(void)
|
||||
}
|
||||
|
||||
static inline void
|
||||
fixcontext(ucontext_t *c __attribute__ ((unused)))
|
||||
fixcontext(__go_context_t *c __attribute__ ((unused)))
|
||||
{
|
||||
}
|
||||
|
||||
@ -182,18 +182,18 @@ fixcontext(ucontext_t* c)
|
||||
// Go, and Go has no simple way to align a field to such a boundary.
|
||||
// So we make the field larger in runtime2.go and pick an appropriate
|
||||
// offset within the field here.
|
||||
static ucontext_t*
|
||||
static __go_context_t*
|
||||
ucontext_arg(uintptr_t* go_ucontext)
|
||||
{
|
||||
uintptr_t p = (uintptr_t)go_ucontext;
|
||||
size_t align = __alignof__(ucontext_t);
|
||||
size_t align = __alignof__(__go_context_t);
|
||||
if(align > 16) {
|
||||
// We only ensured space for up to a 16 byte alignment
|
||||
// in libgo/go/runtime/runtime2.go.
|
||||
runtime_throw("required alignment of ucontext_t too large");
|
||||
runtime_throw("required alignment of __go_context_t too large");
|
||||
}
|
||||
p = (p + align - 1) &~ (uintptr_t)(align - 1);
|
||||
return (ucontext_t*)p;
|
||||
return (__go_context_t*)p;
|
||||
}
|
||||
|
||||
// We can not always refer to the TLS variables directly. The
|
||||
@ -289,7 +289,7 @@ runtime_gogo(G* newg)
|
||||
g = newg;
|
||||
newg->fromgogo = true;
|
||||
fixcontext(ucontext_arg(&newg->context[0]));
|
||||
setcontext(ucontext_arg(&newg->context[0]));
|
||||
__go_setcontext(ucontext_arg(&newg->context[0]));
|
||||
runtime_throw("gogo setcontext returned");
|
||||
}
|
||||
|
||||
@ -328,7 +328,7 @@ runtime_mcall(FuncVal *fv)
|
||||
gp->gcnextsp2 = (uintptr)(secondary_stack_pointer());
|
||||
#endif
|
||||
gp->fromgogo = false;
|
||||
getcontext(ucontext_arg(&gp->context[0]));
|
||||
__go_getcontext(ucontext_arg(&gp->context[0]));
|
||||
|
||||
// When we return from getcontext, we may be running
|
||||
// in a new thread. That means that g may have
|
||||
@ -358,7 +358,7 @@ runtime_mcall(FuncVal *fv)
|
||||
g = mp->g0;
|
||||
|
||||
fixcontext(ucontext_arg(&mp->g0->context[0]));
|
||||
setcontext(ucontext_arg(&mp->g0->context[0]));
|
||||
__go_setcontext(ucontext_arg(&mp->g0->context[0]));
|
||||
runtime_throw("runtime: mcall function returned");
|
||||
}
|
||||
}
|
||||
@ -450,7 +450,7 @@ void getTraceback(G* me, G* gp)
|
||||
#ifdef USING_SPLIT_STACK
|
||||
__splitstack_getcontext((void*)(&me->stackcontext[0]));
|
||||
#endif
|
||||
getcontext(ucontext_arg(&me->context[0]));
|
||||
__go_getcontext(ucontext_arg(&me->context[0]));
|
||||
|
||||
if (gp->traceback != 0) {
|
||||
runtime_gogo(gp);
|
||||
@ -493,7 +493,7 @@ doscanstackswitch(G* me, G* gp)
|
||||
#ifdef USING_SPLIT_STACK
|
||||
__splitstack_getcontext((void*)(&me->stackcontext[0]));
|
||||
#endif
|
||||
getcontext(ucontext_arg(&me->context[0]));
|
||||
__go_getcontext(ucontext_arg(&me->context[0]));
|
||||
|
||||
if(me->entry != nil) {
|
||||
// Got here from mcall.
|
||||
@ -574,7 +574,7 @@ runtime_mstart(void *arg)
|
||||
|
||||
// Save the currently active context. This will return
|
||||
// multiple times via the setcontext call in mcall.
|
||||
getcontext(ucontext_arg(&gp->context[0]));
|
||||
__go_getcontext(ucontext_arg(&gp->context[0]));
|
||||
|
||||
if(gp->traceback != 0) {
|
||||
// Got here from getTraceback.
|
||||
@ -652,7 +652,7 @@ setGContext(void)
|
||||
gp->gcinitialsp2 = secondary_stack_pointer();
|
||||
gp->gcnextsp2 = (uintptr)(gp->gcinitialsp2);
|
||||
#endif
|
||||
getcontext(ucontext_arg(&gp->context[0]));
|
||||
__go_getcontext(ucontext_arg(&gp->context[0]));
|
||||
|
||||
if(gp->entry != nil) {
|
||||
// Got here from mcall.
|
||||
@ -672,13 +672,11 @@ void makeGContext(G*, byte*, uintptr)
|
||||
// makeGContext makes a new context for a g.
|
||||
void
|
||||
makeGContext(G* gp, byte* sp, uintptr spsize) {
|
||||
ucontext_t *uc;
|
||||
__go_context_t *uc;
|
||||
|
||||
uc = ucontext_arg(&gp->context[0]);
|
||||
getcontext(uc);
|
||||
uc->uc_stack.ss_sp = sp;
|
||||
uc->uc_stack.ss_size = (size_t)spsize;
|
||||
makecontext(uc, kickoff, 0);
|
||||
__go_getcontext(uc);
|
||||
__go_makecontext(uc, kickoff, sp, (size_t)spsize);
|
||||
}
|
||||
|
||||
// The goroutine g is about to enter a system call.
|
||||
@ -700,7 +698,7 @@ runtime_entersyscall()
|
||||
// Save the registers in the g structure so that any pointers
|
||||
// held in registers will be seen by the garbage collector.
|
||||
if (!runtime_usestackmaps)
|
||||
getcontext(ucontext_arg(&g->gcregs[0]));
|
||||
__go_getcontext(ucontext_arg(&g->gcregs[0]));
|
||||
|
||||
// Note that if this function does save any registers itself,
|
||||
// we might store the wrong value in the call to getcontext.
|
||||
@ -747,7 +745,7 @@ runtime_entersyscallblock()
|
||||
// Save the registers in the g structure so that any pointers
|
||||
// held in registers will be seen by the garbage collector.
|
||||
if (!runtime_usestackmaps)
|
||||
getcontext(ucontext_arg(&g->gcregs[0]));
|
||||
__go_getcontext(ucontext_arg(&g->gcregs[0]));
|
||||
|
||||
// See comment in runtime_entersyscall.
|
||||
doentersyscallblock((uintptr)runtime_getcallerpc(),
|
||||
|
||||
@ -510,3 +510,20 @@ bool probestackmaps(void)
|
||||
// older versions of glibc when a SIGPROF signal arrives while
|
||||
// collecting a backtrace.
|
||||
extern uint32 __go_runtime_in_callers;
|
||||
|
||||
// Cheaper context switch functions. Currently only defined on
|
||||
// Linux/AMD64.
|
||||
#if defined(__x86_64__) && defined(__linux__) && !defined(__CET__)
|
||||
typedef struct {
|
||||
uint64 regs[8];
|
||||
} __go_context_t;
|
||||
int __go_getcontext(__go_context_t*);
|
||||
int __go_setcontext(__go_context_t*);
|
||||
void __go_makecontext(__go_context_t*, void (*)(), void*, size_t);
|
||||
#else
|
||||
#define __go_context_t ucontext_t
|
||||
#define __go_getcontext(c) getcontext(c)
|
||||
#define __go_setcontext(c) setcontext(c)
|
||||
#define __go_makecontext(c, fn, sp, size) \
|
||||
((c)->uc_stack.ss_sp = sp, (c)->uc_stack.ss_size = size, makecontext(c, fn, 0))
|
||||
#endif
|
||||
|
||||
@ -141,6 +141,9 @@ AUTOHEADER = @AUTOHEADER@
|
||||
AUTOMAKE = @AUTOMAKE@
|
||||
AWK = @AWK@
|
||||
CC = @CC@
|
||||
CCAS = @CCAS@
|
||||
CCASDEPMODE = @CCASDEPMODE@
|
||||
CCASFLAGS = @CCASFLAGS@
|
||||
CCDEPMODE = @CCDEPMODE@
|
||||
CC_FOR_BUILD = @CC_FOR_BUILD@
|
||||
CFLAGS = @CFLAGS@
|
||||
@ -273,6 +276,7 @@ pdfdir = @pdfdir@
|
||||
prefix = @prefix@
|
||||
program_transform_name = @program_transform_name@
|
||||
psdir = @psdir@
|
||||
runstatedir = @runstatedir@
|
||||
sbindir = @sbindir@
|
||||
sharedstatedir = @sharedstatedir@
|
||||
srcdir = @srcdir@
|
||||
|
||||
Loading…
Reference in New Issue
Block a user