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[dev.power64] runtime: implemnt runtime.switchtoM and runtime.onM

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LGTM=rsc
R=rsc, iant
CC=golang-codereviews
https://golang.org/cl/129860043
This commit is contained in:
Shenghou Ma 2014-08-12 21:55:43 -04:00
parent ca7f2c796f
commit c229cec23a
1 changed files with 51 additions and 0 deletions
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51
src/pkg/runtime/asm_power64x.s
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@ -145,6 +145,57 @@ TEXT runtime·mcall(SB), NOSPLIT, $-8-8
BL (CTR)
BR runtime·badmcall2(SB)
// switchtoM is a dummy routine that onM leaves at the bottom
// of the G stack. We need to distinguish the routine that
// lives at the bottom of the G stack from the one that lives
// at the top of the M stack because the one at the top of
// the M stack terminates the stack walk (see topofstack()).
TEXT runtime·switchtoM(SB), NOSPLIT, $0-8
UNDEF
BL (LR) // make sure this function is not leaf
RETURN
// void onM(void (*fn)())
// calls fn() on the M stack.
// switches to the M stack if not already on it, and
// switches back when fn() returns.
TEXT runtime·onM(SB), NOSPLIT, $0-8
MOVD fn+0(FP), R3 // R3 = fn
MOVD R3, CTR
MOVD g_m(g), R4 // R4 = m
MOVD m_g0(R4), R5 // R5 = g0
CMP g, R5
BEQ onm
// save our state in g->sched. Pretend to
// be switchtoM if the G stack is scanned.
MOVD $runtime·switchtoM(SB), R6
ADD $8, R6 // get past prologue
MOVD R6, (g_sched+gobuf_pc)(g)
MOVD R1, (g_sched+gobuf_sp)(g)
MOVD R0, (g_sched+gobuf_lr)(g)
MOVD g, (g_sched+gobuf_g)(g)
// switch to g0
MOVD R5, g
MOVD (g_sched+gobuf_sp)(g), R1
// call target function
ARGSIZE(0)
BL (CTR)
// switch back to g
MOVD g_m(g), R3
MOVD m_curg(R3), g
MOVD (g_sched+gobuf_sp)(g), R1
MOVD R0, (g_sched+gobuf_sp)(g)
RETURN
onm:
// already on m stack, just call directly
BL (CTR)
RETURN
/*
* support for morestack
*/