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runtime: allow for usleep2HighRes to run without TLS setup

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This change adjusts usleep2HighRes so it does not crash when TLS is
not configured. When g is not available, usleep2HighRes just calls
usleep2 instead.

Updates #8687

Change-Id: Idbb80f7b71d1da350a6a7df7c49154eb1ffe29a8
Reviewed-on: https://go-review.googlesource.com/c/go/+/271907
Run-TryBot: Alex Brainman <alex.brainman@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Simon Rozman <simon@rozman.si>
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Trust: Alex Brainman <alex.brainman@gmail.com>
This commit is contained in:
Alex Brainman 2020-11-21 14:56:26 +11:00
parent 7dc5d909fb
commit 6965b01ea2
2 changed files with 20 additions and 2 deletions
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11
src/runtime/sys_windows_386.s
View File

@ -415,12 +415,15 @@ TEXT runtime·usleep2(SB),NOSPLIT,$20
// Runs on OS stack. duration (in 100ns units) is in BX.
TEXT runtime·usleep2HighRes(SB),NOSPLIT,$36
get_tls(CX)
CMPL CX, $0
JE gisnotset
// Want negative 100ns units.
NEGL BX
MOVL $-1, hi-4(SP)
MOVL BX, lo-8(SP)
get_tls(CX)
MOVL g(CX), CX
MOVL g_m(CX), CX
MOVL (m_mOS+mOS_highResTimer)(CX), CX
@ -449,6 +452,12 @@ TEXT runtime·usleep2HighRes(SB),NOSPLIT,$36
RET
gisnotset:
// TLS is not configured. Call usleep2 instead.
MOVL $runtime·usleep2(SB), AX
CALL AX
RET
// Runs on OS stack.
TEXT runtime·switchtothread(SB),NOSPLIT,$0
MOVL SP, BP

11
src/runtime/sys_windows_amd64.s
View File

@ -454,11 +454,14 @@ TEXT runtime·usleep2(SB),NOSPLIT|NOFRAME,$48
// Runs on OS stack. duration (in 100ns units) is in BX.
TEXT runtime·usleep2HighRes(SB),NOSPLIT|NOFRAME,$72
get_tls(CX)
CMPQ CX, $0
JE gisnotset
MOVQ SP, AX
ANDQ $~15, SP // alignment as per Windows requirement
MOVQ AX, 64(SP)
get_tls(CX)
MOVQ g(CX), CX
MOVQ g_m(CX), CX
MOVQ (m_mOS+mOS_highResTimer)(CX), CX // hTimer
@ -484,6 +487,12 @@ TEXT runtime·usleep2HighRes(SB),NOSPLIT|NOFRAME,$72
MOVQ 64(SP), SP
RET
gisnotset:
// TLS is not configured. Call usleep2 instead.
MOVQ $runtime·usleep2(SB), AX
CALL AX
RET
// Runs on OS stack.
TEXT runtime·switchtothread(SB),NOSPLIT|NOFRAME,$0
MOVQ SP, AX