libgo: support for sparc64 GNU/Linux
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
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@ -1,4 +1,4 @@
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884df09c3da0f39309ab13f2ad401628fb933050
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e5870eac67d4d5b1f86bdbfb13dadf4d5723f71d
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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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@ -531,7 +531,7 @@ s-version: Makefile
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runtime_sysinfo.go: s-runtime_sysinfo; @true
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s-runtime_sysinfo: $(srcdir)/mkrsysinfo.sh gen-sysinfo.go
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GOOS=$(GOOS) $(SHELL) $(srcdir)/mkrsysinfo.sh
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GOARCH=$(GOARCH) GOOS=$(GOOS) $(SHELL) $(srcdir)/mkrsysinfo.sh
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$(SHELL) $(srcdir)/mvifdiff.sh tmp-runtime_sysinfo.go runtime_sysinfo.go
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$(STAMP) $@
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@ -3081,7 +3081,7 @@ s-version: Makefile
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runtime_sysinfo.go: s-runtime_sysinfo; @true
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s-runtime_sysinfo: $(srcdir)/mkrsysinfo.sh gen-sysinfo.go
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GOOS=$(GOOS) $(SHELL) $(srcdir)/mkrsysinfo.sh
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GOARCH=$(GOARCH) GOOS=$(GOOS) $(SHELL) $(srcdir)/mkrsysinfo.sh
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$(SHELL) $(srcdir)/mvifdiff.sh tmp-runtime_sysinfo.go runtime_sysinfo.go
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$(STAMP) $@
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@ -32,9 +32,18 @@ const (
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// bottom, because node must be pointer-aligned, giving a total of 19 bits
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// of count.
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cntBits = 64 - addrBits + 3
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// On sparc64-linux, user addresses are 52-bit numbers sign extended to 64.
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// We shift the address left 12 to eliminate the sign extended part and make
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// room in the bottom for the count.
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sparcLinuxAddrBits = 52
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sparcLinuxCntBits = 64 - sparcLinuxAddrBits + 3
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)
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func lfstackPack(node *lfnode, cnt uintptr) uint64 {
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if GOARCH == "sparc64" && GOOS == "linux" {
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return uint64(uintptr(unsafe.Pointer(node)))<<(64-sparcLinuxAddrBits) | uint64(cnt&(1<<sparcLinuxCntBits-1))
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}
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return uint64(uintptr(unsafe.Pointer(node)))<<(64-addrBits) | uint64(cnt&(1<<cntBits-1))
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}
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@ -44,5 +53,8 @@ func lfstackUnpack(val uint64) *lfnode {
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// val before unpacking.
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return (*lfnode)(unsafe.Pointer(uintptr(int64(val) >> cntBits << 3)))
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}
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if GOARCH == "sparc64" && GOOS == "linux" {
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return (*lfnode)(unsafe.Pointer(uintptr(int64(val) >> sparcLinuxCntBits << 3)))
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}
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return (*lfnode)(unsafe.Pointer(uintptr(val >> cntBits << 3)))
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}
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@ -83,7 +83,11 @@ if grep '^const _epoll_data_offset ' ${OUT} >/dev/null 2>&1; then
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if test "$val" = "4"; then
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echo 'type epollevent struct { events uint32; data [8]byte }' >> ${OUT}
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elif test "$val" = "8"; then
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if test "$GOARCH" = "sparc64" -a "$GOOS" = "linux"; then
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echo 'type epollevent struct { events uint32; pad [4]byte; data [8]byte; _align [0]int64 }' >> ${OUT}
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else
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echo 'type epollevent struct { events uint32; pad [4]byte; data [8]byte }' >> ${OUT}
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fi
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else
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echo 1>&2 "unknown epoll data offset value ${val}"
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exit 1
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