[dev.power64] runtime: fix morestack

Must not save LR.

LGTM=rsc
R=rsc, iant
CC=golang-codereviews
https://golang.org/cl/129040044

diff --git a/src/pkg/runtime/asm_power64x.s b/src/pkg/runtime/asm_power64x.s
index 5c67e194853007ebc5f091c507b23db10ed65df0..2fbaf5a53ecb985ca51fa89bcdd261923102a22d 100644 (file)
--- a/src/pkg/runtime/asm_power64x.s
+++ b/src/pkg/runtime/asm_power64x.s
@@ -208,7 +208,7 @@ onm:
 // the top of a stack (for example, morestack calling newstack
 // calling the scheduler calling newm calling gc), so we must
 // record an argument size. For that purpose, it has no arguments.
-TEXT runtime·morestack(SB),NOSPLIT,$0-0
+TEXT runtime·morestack(SB),NOSPLIT,$-8-0
        // Cannot grow scheduler stack (m->g0).
        MOVD    g_m(g), R7
        MOVD    m_g0(R7), R8
@@ -244,7 +244,7 @@ TEXT runtime·morestack(SB),NOSPLIT,$0-0
        // is still in this function, and not the beginning of the next.
        UNDEF
 
-TEXT runtime·morestack_noctxt(SB),NOSPLIT,$0-0
+TEXT runtime·morestack_noctxt(SB),NOSPLIT,$-8-0
        MOVD    R0, R11
        BR      runtime·morestack(SB)
 
@@ -306,7 +306,7 @@ TEXT runtime·newstackcall(SB), NOSPLIT, $-8-20
        BR      (CTR)
 
 // Note: can't just "BR runtime·NAME(SB)" - bad inlining results.
-TEXT reflect·call(SB), NOSPLIT, $0-24
+TEXT reflect·call(SB), NOSPLIT, $-8-24
        MOVW argsize+16(FP), R3
        DISPATCH(call16, 16)
        DISPATCH(call32, 32)