runtime: various arm fixes
* correct symbol table size
* do not reorder functions in output
* traceback
* signal handling
* use same code for go + defer
* handle leaf functions in symbol table
R=kaib, dpx
CC=golang-dev
https://golang.org/cl/884041
diff --git a/src/pkg/runtime/amd64/asm.s b/src/pkg/runtime/amd64/asm.s
index 9c966c5..8fbc980 100644
--- a/src/pkg/runtime/amd64/asm.s
+++ b/src/pkg/runtime/amd64/asm.s
@@ -311,3 +311,29 @@
INT $3
RET
+TEXT ·memclr(SB),7,$0
+ MOVQ 8(SP), DI // arg 1 addr
+ MOVL 16(SP), CX // arg 2 count
+ ADDL $7, CX
+ SHRL $3, CX
+ MOVQ $0, AX
+ CLD
+ REP
+ STOSQ
+ RET
+
+TEXT ·getcallerpc+0(SB),7,$0
+ MOVQ x+0(FP),AX // addr of first arg
+ MOVQ -8(AX),AX // get calling pc
+ RET
+
+TEXT ·setcallerpc+0(SB),7,$0
+ MOVQ x+0(FP),AX // addr of first arg
+ MOVQ x+8(FP), BX
+ MOVQ BX, -8(AX) // set calling pc
+ RET
+
+TEXT getcallersp(SB),7,$0
+ MOVQ sp+0(FP), AX
+ RET
+
