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| author | Austin Clements <austin@google.com> | 2017-02-09 14:03:49 -0500 |
|---|---|---|
| committer | Austin Clements <austin@google.com> | 2017-02-14 15:52:54 +0000 |
| commit | d089a6c7187f1ff85277515405ec6c641588a7ff (patch) | |
| tree | 2eb4d16038ec3ade478a83249cc879898efd5b8b /src/runtime/asm_mips64x.s | |
| parent | c5ebcd2c8ac6c5bdf85ec0a346974efd4b0cbe49 (diff) | |
| download | go-d089a6c7187f1ff85277515405ec6c641588a7ff.tar.gz go-d089a6c7187f1ff85277515405ec6c641588a7ff.zip | |
runtime: remove stack barriers
Now that we don't rescan stacks, stack barriers are unnecessary. This
removes all of the code and structures supporting them as well as
tests that were specifically for stack barriers.
Updates #17503.
Change-Id: Ia29221730e0f2bbe7beab4fa757f31a032d9690c
Reviewed-on: https://go-review.googlesource.com/36620
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Diffstat (limited to 'src/runtime/asm_mips64x.s')
| -rw-r--r-- | src/runtime/asm_mips64x.s | 32 |
1 files changed, 0 insertions, 32 deletions
diff --git a/src/runtime/asm_mips64x.s b/src/runtime/asm_mips64x.s index 1de8d71f67..34242f5536 100644 --- a/src/runtime/asm_mips64x.s +++ b/src/runtime/asm_mips64x.s @@ -286,24 +286,6 @@ TEXT runtime·morestack_noctxt(SB),NOSPLIT,$-8-0 MOVV R0, REGCTXT JMP runtime·morestack(SB) -TEXT runtime·stackBarrier(SB),NOSPLIT,$0 - // We came here via a RET to an overwritten LR. - // R1 may be live. Other registers are available. - - // Get the original return PC, g.stkbar[g.stkbarPos].savedLRVal. - MOVV (g_stkbar+slice_array)(g), R2 - MOVV g_stkbarPos(g), R3 - MOVV $stkbar__size, R4 - MULVU R3, R4 - MOVV LO, R4 - ADDV R2, R4 - MOVV stkbar_savedLRVal(R4), R4 - // Record that this stack barrier was hit. - ADDV $1, R3 - MOVV R3, g_stkbarPos(g) - // Jump to the original return PC. - JMP (R4) - // reflectcall: call a function with the given argument list // func call(argtype *_type, f *FuncVal, arg *byte, argsize, retoffset uint32). // we don't have variable-sized frames, so we use a small number @@ -636,27 +618,13 @@ TEXT setg_gcc<>(SB),NOSPLIT,$0-0 TEXT runtime·getcallerpc(SB),NOSPLIT,$8-16 MOVV 16(R29), R1 // LR saved by caller - MOVV runtime·stackBarrierPC(SB), R2 - BNE R1, R2, nobar - // Get original return PC. - JAL runtime·nextBarrierPC(SB) - MOVV 8(R29), R1 -nobar: MOVV R1, ret+8(FP) RET TEXT runtime·setcallerpc(SB),NOSPLIT,$8-16 MOVV pc+8(FP), R1 - MOVV 16(R29), R2 - MOVV runtime·stackBarrierPC(SB), R3 - BEQ R2, R3, setbar MOVV R1, 16(R29) // set LR in caller RET -setbar: - // Set the stack barrier return PC. - MOVV R1, 8(R29) - JAL runtime·setNextBarrierPC(SB) - RET TEXT runtime·abort(SB),NOSPLIT,$-8-0 MOVW (R0), R0 |