code review 7395050: cmd/6g, cmd/8g: switch to DX for indirect call block

src/pkg/runtime/asm_arm.s

 // Copyright 2009 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 #include "zasm_GOOS_GOARCH.h"
 
 // using frame size $-4 means do not save LR on stack.
 TEXT _rt0_arm(SB),7,$-4
         MOVW    $0xcafebabe, R12
 
@@ skipping 170 matching lines @@
 // NB. we do not save R0 because we've forced 5c to pass all arguments
 // on the stack.
 // using frame size $-4 means do not save LR on stack.
 TEXT runtime·morestack(SB),7,$-4
         // Cannot grow scheduler stack (m->g0).
         MOVW    m_g0(m), R4
         CMP     g, R4
         BL.EQ   runtime·abort(SB)
 
         // Save in m.
+        MOVW    R0, m_cret(m) // function context
         MOVW    R1, m_moreframesize(m)
         MOVW    R2, m_moreargsize(m)
 
         // Called from f.
         // Set m->morebuf to f's caller.
         MOVW    R3, (m_morebuf+gobuf_pc)(m)     // f's caller's PC
         MOVW    SP, (m_morebuf+gobuf_sp)(m)     // f's caller's SP
         MOVW    $4(SP), R3                      // f's argument pointer
         MOVW    R3, m_moreargp(m)·······
         MOVW    g, (m_morebuf+gobuf_g)(m)
@@ skipping 266 matching lines @@
 casfail:
         MOVW    $0, R0
         RET
 
 TEXT runtime·stackguard(SB),7,$0
         MOVW    R13, R1
         MOVW    g_stackguard(g), R2
         MOVW    R1, sp+0(FP)
         MOVW    R2, limit+4(FP)
         RET