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libgo: support for sparc64 GNU/Linux

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Fix lfstack code to work with sparc64 GNU/Linux address map.
    
    Force alignment of epollevent.  To make this work reliably, pass
    GOARCH explicitly to mkrsysinfo.sh.
    
    Patch by Vladimir Mezentsev.
    
    Reviewed-on: https://go-review.googlesource.com/44494

From-SVN: r248765
This commit is contained in:
Ian Lance Taylor 2017-05-31 21:36:42 +00:00
parent 4f14911c80
commit 30bc05cfcb
5 changed files with 20 additions and 4 deletions
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2
gcc/go/gofrontend/MERGE
View file

@ -1,4 +1,4 @@
884df09c3da0f39309ab13f2ad401628fb933050
e5870eac67d4d5b1f86bdbfb13dadf4d5723f71d
The first line of this file holds the git revision number of the last
merge done from the gofrontend repository.

2
libgo/Makefile.am
View file

@ -531,7 +531,7 @@ s-version: Makefile
runtime_sysinfo.go: s-runtime_sysinfo; @true
s-runtime_sysinfo: $(srcdir)/mkrsysinfo.sh gen-sysinfo.go
GOOS=$(GOOS) $(SHELL) $(srcdir)/mkrsysinfo.sh
GOARCH=$(GOARCH) GOOS=$(GOOS) $(SHELL) $(srcdir)/mkrsysinfo.sh
$(SHELL) $(srcdir)/mvifdiff.sh tmp-runtime_sysinfo.go runtime_sysinfo.go
$(STAMP) $@

2
libgo/Makefile.in
View file

@ -3081,7 +3081,7 @@ s-version: Makefile
runtime_sysinfo.go: s-runtime_sysinfo; @true
s-runtime_sysinfo: $(srcdir)/mkrsysinfo.sh gen-sysinfo.go
GOOS=$(GOOS) $(SHELL) $(srcdir)/mkrsysinfo.sh
GOARCH=$(GOARCH) GOOS=$(GOOS) $(SHELL) $(srcdir)/mkrsysinfo.sh
$(SHELL) $(srcdir)/mvifdiff.sh tmp-runtime_sysinfo.go runtime_sysinfo.go
$(STAMP) $@

12
libgo/go/runtime/lfstack_64bit.go
View file

@ -32,9 +32,18 @@ const (
// bottom, because node must be pointer-aligned, giving a total of 19 bits
// of count.
cntBits = 64 - addrBits + 3
// On sparc64-linux, user addresses are 52-bit numbers sign extended to 64.
// We shift the address left 12 to eliminate the sign extended part and make
// room in the bottom for the count.
sparcLinuxAddrBits = 52
sparcLinuxCntBits = 64 - sparcLinuxAddrBits + 3
)
func lfstackPack(node *lfnode, cnt uintptr) uint64 {
if GOARCH == "sparc64" && GOOS == "linux" {
return uint64(uintptr(unsafe.Pointer(node)))<<(64-sparcLinuxAddrBits) | uint64(cnt&(1<<sparcLinuxCntBits-1))
}
return uint64(uintptr(unsafe.Pointer(node)))<<(64-addrBits) | uint64(cnt&(1<<cntBits-1))
}
@ -44,5 +53,8 @@ func lfstackUnpack(val uint64) *lfnode {
// val before unpacking.
return (*lfnode)(unsafe.Pointer(uintptr(int64(val) >> cntBits << 3)))
}
if GOARCH == "sparc64" && GOOS == "linux" {
return (*lfnode)(unsafe.Pointer(uintptr(int64(val) >> sparcLinuxCntBits << 3)))
}
return (*lfnode)(unsafe.Pointer(uintptr(val >> cntBits << 3)))
}

6
libgo/mkrsysinfo.sh
View file

@ -83,7 +83,11 @@ if grep '^const _epoll_data_offset ' ${OUT} >/dev/null 2>&1; then
if test "$val" = "4"; then
echo 'type epollevent struct { events uint32; data [8]byte }' >> ${OUT}
elif test "$val" = "8"; then
echo 'type epollevent struct { events uint32; pad [4]byte; data [8]byte }' >> ${OUT}
if test "$GOARCH" = "sparc64" -a "$GOOS" = "linux"; then
echo 'type epollevent struct { events uint32; pad [4]byte; data [8]byte; _align [0]int64 }' >> ${OUT}
else
echo 'type epollevent struct { events uint32; pad [4]byte; data [8]byte }' >> ${OUT}
fi
else
echo 1>&2 "unknown epoll data offset value ${val}"
exit 1