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cmd/go, runtime: always use position-independent code to invoke vsyscall helper on linux/386

Browse source 
golang.org/cl/16346 changed the runtime on linux/386 to invoke the vsyscall
helper via a PIC sequence (CALL 0x10(GS)) when dynamically linking. But it's
actually quite easy to make that code sequence work all the time, so do that,
and remove the ugly machinery that passed the buildmode from the go tool to the
assembly.

This means enlarging m.tls so that we can safely access 0x10(GS) (GS is set to
&m.tls + 4, so 0x10(GS) accesses m_tls[5]).

Change-Id: I1345c34029b149cb5f25320bf19a3cdd73a056fa
Reviewed-on: https://go-review.googlesource.com/16796
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Michael Hudson-Doyle 2015-11-12 12:55:57 +13:00
parent 52393ad036
commit 7af0839e11
3 changed files with 49 additions and 52 deletions
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2
src/runtime/runtime2.go
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@ -274,7 +274,7 @@ type m struct {
procid uint64 // for debuggers, but offset not hard-coded
gsignal *g // signal-handling g
sigmask [4]uintptr // storage for saved signal mask
tls [4]uintptr // thread-local storage (for x86 extern register)
tls [6]uintptr // thread-local storage (for x86 extern register)
mstartfn func()
curg *g // current running goroutine
caughtsig guintptr // goroutine running during fatal signal