author | Shawn Walker-Salas <shawn.walker@oracle.com> |
Thu, 21 Jan 2016 09:20:59 -0800 | |
changeset 5331 | 9c955076ffe3 |
permissions | -rw-r--r-- |
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From edc3452f4aba40ef97961ca43f0ffb60f1e30e9c Mon Sep 17 00:00:00 2001 |
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From: Russ Cox <[email protected]> |
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Date: Thu, 19 Nov 2015 15:51:39 -0500 |
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Subject: [PATCH 54/63] [release-branch.go1.5] runtime: make asmcgocall work |
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without a g |
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MIME-Version: 1.0 |
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Content-Type: text/plain; charset=UTF-8 |
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Content-Transfer-Encoding: 8bit |
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Solaris needs to make system calls without a g, |
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and Solaris uses asmcgocall to make system calls. |
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I know, I know. |
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I hope this makes CL 16915, fixing #12277, work on Solaris. |
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Change-Id: If988dfd37f418b302da9c7096f598e5113ecea87 |
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Reviewed-on: https://go-review.googlesource.com/17072 |
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Reviewed-by: Ian Lance Taylor <[email protected]> |
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Reviewed-by: Aram Hăvărneanu <[email protected]> |
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Run-TryBot: Russ Cox <[email protected]> |
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Reviewed-on: https://go-review.googlesource.com/17129 |
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--- |
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src/runtime/asm_amd64.s | 27 ++++++++++++++++++++++++++- |
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1 file changed, 26 insertions(+), 1 deletion(-) |
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diff --git a/src/runtime/asm_amd64.s b/src/runtime/asm_amd64.s |
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index 3b4ca4d..980b1ca 100644 |
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--- a/src/runtime/asm_amd64.s |
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+++ b/src/runtime/asm_amd64.s |
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@@ -661,6 +661,8 @@ TEXT ·asmcgocall(SB),NOSPLIT,$0-20 |
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// come in on the m->g0 stack already. |
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get_tls(CX) |
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MOVQ g(CX), R8 |
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+ CMPQ R8, $0 |
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+ JEQ nosave |
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MOVQ g_m(R8), R8 |
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MOVQ m_g0(R8), SI |
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MOVQ g(CX), DI |
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@@ -670,11 +672,11 @@ TEXT ·asmcgocall(SB),NOSPLIT,$0-20 |
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CMPQ SI, DI |
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JEQ nosave |
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+ // Switch to system stack. |
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MOVQ m_g0(R8), SI |
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CALL gosave<>(SB) |
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MOVQ SI, g(CX) |
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MOVQ (g_sched+gobuf_sp)(SI), SP |
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-nosave: |
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// Now on a scheduling stack (a pthread-created stack). |
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// Make sure we have enough room for 4 stack-backed fast-call |
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@@ -700,6 +702,29 @@ nosave: |
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MOVL AX, ret+16(FP) |
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RET |
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+nosave: |
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+ // Running on a system stack, perhaps even without a g. |
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+ // Having no g can happen during thread creation or thread teardown |
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+ // (see needm/dropm on Solaris, for example). |
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+ // This code is like the above sequence but without saving/restoring g |
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+ // and without worrying about the stack moving out from under us |
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+ // (because we're on a system stack, not a goroutine stack). |
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+ // The above code could be used directly if already on a system stack, |
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+ // but then the only path through this code would be a rare case on Solaris. |
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+ // Using this code for all "already on system stack" calls exercises it more, |
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+ // which should help keep it correct. |
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+ SUBQ $64, SP |
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+ ANDQ $~15, SP |
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+ MOVQ $0, 48(SP) // where above code stores g, in case someone looks during debugging |
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+ MOVQ DX, 40(SP) // save original stack pointer |
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+ MOVQ BX, DI // DI = first argument in AMD64 ABI |
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+ MOVQ BX, CX // CX = first argument in Win64 |
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+ CALL AX |
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+ MOVQ 40(SP), SI // restore original stack pointer |
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+ MOVQ SI, SP |
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+ MOVL AX, ret+16(FP) |
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+ RET |
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+ |
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// cgocallback(void (*fn)(void*), void *frame, uintptr framesize) |
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// Turn the fn into a Go func (by taking its address) and call |
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// cgocallback_gofunc. |
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-- |
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2.6.1 |
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