changed 5c calling convention to use stack exclusively for in
params. a number of fixes to assembly routines that assumed R0
had the first arg. one stack offset fix, arm pushes the link
register on stack top.
go/test: passes 65% (235/364) tests
R=rsc
APPROVED=rsc
DELTA=20 (11 added, 0 deleted, 9 changed)
OCL=34809
CL=34812
diff --git a/src/pkg/runtime/arm/asm.s b/src/pkg/runtime/arm/asm.s
index c43b6ee..18e17be 100644
--- a/src/pkg/runtime/arm/asm.s
+++ b/src/pkg/runtime/arm/asm.s
@@ -92,6 +92,7 @@
// uintptr gosave(Gobuf*)
// save state in Gobuf; setjmp
TEXT gosave(SB), 7, $0
+ MOVW 0(FP), R0
MOVW SP, gobuf_sp(R0)
MOVW LR, gobuf_pc(R0)
MOVW g, gobuf_g(R0)
@@ -101,8 +102,8 @@
// void gogo(Gobuf*, uintptr)
// restore state from Gobuf; longjmp
TEXT gogo(SB), 7, $0
- MOVW R0, R1 // gobuf
- MOVW 8(SP), R0 // return 2nd arg
+ MOVW 0(FP), R1 // gobuf
+ MOVW 4(FP), R0 // return 2nd arg
MOVW gobuf_g(R1), g
MOVW 0(g), R2 // make sure g != nil
MOVW gobuf_sp(R1), SP // restore SP
@@ -113,7 +114,8 @@
// (call fn, returning to state in Gobuf)
// using frame size $-4 means do not save LR on stack.
TEXT gogocall(SB), 7, $-4
- MOVW 8(SP), R1 // fn
+ MOVW 0(FP), R0
+ MOVW 4(FP), R1 // fn
MOVW gobuf_g(R0), g
MOVW 0(g), R2 // make sure g != nil
MOVW gobuf_sp(R0), SP // restore SP
@@ -222,6 +224,7 @@
#define STREX(a,v,r) WORD $(0xe<<28|0x01800f90 | (a)<<16 | (r)<<12 | (v)<<0)
TEXT cas+0(SB),0,$12 /* r0 holds p */
+ MOVW 0(FP), R0
MOVW ov+4(FP), R1
MOVW nv+8(FP), R2
spin:
@@ -253,7 +256,7 @@
// JMP AX // but first run the deferred function
TEXT sys·memclr(SB),7,$20
-// R0 = addr and passes implicitly to memset
+ MOVW 0(FP), R0
MOVW $0, R1 // c = 0
MOVW R1, -16(SP)
MOVW 4(FP), R1 // n
