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[dev.cc] runtime: merge power64 onM/onM_signalok into systemstack

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This is the power64 component of CL 174950043.

With this, dev.cc compiles on power64 and power64le and passes
most tests if GOGC=off (but crashes in go_bootstrap if GC is
on).

LGTM=rsc
R=rsc
CC=golang-codereviews
https://golang.org/cl/175290043
This commit is contained in:
Austin Clements 2014-11-18 15:50:36 -05:00
parent 70f6769b60
commit f4627d1b05
1 changed files with 19 additions and 33 deletions
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52
src/runtime/asm_power64x.s
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@ -145,58 +145,44 @@ TEXT runtime·mcall(SB), NOSPLIT, $-8-8
BL (CTR)
BR runtime·badmcall2(SB)
// switchtoM is a dummy routine that onM leaves at the bottom
// systemstack_switch is a dummy routine that systemstack 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, $0-0
// at the top of the system stack because the one at the top of
// the system stack terminates the stack walk (see topofstack()).
TEXT runtime·systemstack_switch(SB), NOSPLIT, $0-0
UNDEF
BL (LR) // make sure this function is not leaf
RETURN
// func onM_signalok(fn func())
TEXT runtime·onM_signalok(SB), NOSPLIT, $8-8
MOVD g, R3 // R3 = g
MOVD g_m(R3), R4 // R4 = g->m
MOVD m_gsignal(R4), R4 // R4 = g->m->gsignal
MOVD fn+0(FP), R11 // context for call below
CMP R3, R4
BEQ onsignal
MOVD R11, 8(R1)
BL runtime·onM(SB)
RETURN
onsignal:
MOVD 0(R11), R3 // code pointer
MOVD R3, CTR
BL (CTR)
RETURN
// void onM(fn func())
TEXT runtime·onM(SB), NOSPLIT, $0-8
// func systemstack(fn func())
TEXT runtime·systemstack(SB), NOSPLIT, $0-8
MOVD fn+0(FP), R3 // R3 = fn
MOVD R3, R11 // context
MOVD g_m(g), R4 // R4 = m
MOVD m_gsignal(R4), R5 // R5 = gsignal
CMP g, R5
BEQ noswitch
MOVD m_g0(R4), R5 // R5 = g0
CMP g, R5
BEQ onm
BEQ noswitch
MOVD m_curg(R4), R6
CMP g, R6
BEQ oncurg
BEQ switch
// Not g0, not curg. Must be gsignal, but that's not allowed.
// Bad: g is not gsignal, not g0, not curg. What is it?
// Hide call from linker nosplit analysis.
MOVD $runtime·badonm(SB), R3
MOVD $runtime·badsystemstack(SB), R3
MOVD R3, CTR
BL (CTR)
oncurg:
switch:
// save our state in g->sched. Pretend to
// be switchtoM if the G stack is scanned.
MOVD $runtime·switchtoM(SB), R6
// be systemstack_switch if the G stack is scanned.
MOVD $runtime·systemstack_switch(SB), R6
ADD $8, R6 // get past prologue
MOVD R6, (g_sched+gobuf_pc)(g)
MOVD R1, (g_sched+gobuf_sp)(g)
@ -206,7 +192,7 @@ oncurg:
// switch to g0
MOVD R5, g
MOVD (g_sched+gobuf_sp)(g), R3
// make it look like mstart called onM on g0, to stop traceback
// make it look like mstart called systemstack on g0, to stop traceback
SUB $8, R3
MOVD $runtime·mstart(SB), R4
MOVD R4, 0(R3)
@ -224,7 +210,7 @@ oncurg:
MOVD R0, (g_sched+gobuf_sp)(g)
RETURN
onm:
noswitch:
// already on m stack, just call directly
MOVD 0(R11), R3 // code pointer
MOVD R3, CTR