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https://github.com/golang/go
synced 2024-11-22 06:04:39 -07:00
move cas out, add dummy runcgo.
R=rsc APPROVED=rsc DELTA=73 (45 added, 28 deleted, 0 changed) OCL=35363 CL=35366
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@ -30,6 +30,7 @@ OFILES_386=\
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# arm-specific object files
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OFILES_arm=\
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cas.$O\
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memset.$O\
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vlop.$O\
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vlrt.$O\
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@ -213,47 +213,19 @@ TEXT sys·morestackx(SB), 7, $-4
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MOVW $0, R1 // set frame size
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B sys·morestack(SB)
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// bool cas(int32 *val, int32 old, int32 new)
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// Atomically:
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// if(*val == old){
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// *val = new;
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// return 1;
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// }else
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// return 0;
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#define LDREX(a,r) WORD $(0xe<<28|0x01900f9f | (a)<<16 | (r)<<12)
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#define STREX(a,v,r) WORD $(0xe<<28|0x01800f90 | (a)<<16 | (r)<<12 | (v)<<0)
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TEXT cas+0(SB),0,$12 /* r0 holds p */
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MOVW 0(FP), R0
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MOVW ov+4(FP), R1
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MOVW nv+8(FP), R2
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spin:
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/* LDREX 0(R0),R3 */
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LDREX(0,3)
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CMP.S R3, R1
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BNE fail
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/* STREX 0(R0),R2,R4 */
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STREX(0,2,4)
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CMP.S $0, R4
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BNE spin
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MOVW $1, R0
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RET
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fail:
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MOVW $0, R0
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RET
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// void jmpdefer(fn, sp);
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// called from deferreturn.
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// 1. pop the caller
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// 2. sub 5 bytes from the callers return
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// 3. jmp to the argument
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// 1. grab stored LR for caller
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// 2. sub 4 bytes to get back to BL deferreturn
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// 3. B to fn
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TEXT jmpdefer(SB), 7, $0
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BL abort(SB)
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// MOVL 4(SP), AX // fn
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// MOVL 8(SP), BX // caller sp
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// LEAL -4(BX), SP // caller sp after CALL
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// SUBL $5, (SP) // return to CALL again
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// JMP AX // but first run the deferred function
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MOVW 0(SP), LR
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MOVW $-4(LR), LR // BL deferreturn
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MOVW 4(SP), R0 // fn
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MOVW 8(SP), R1
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MOVW $-4(R1), SP // correct for sp pointing to arg0, past stored lr
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B (R0)
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TEXT sys·memclr(SB),7,$20
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MOVW 0(FP), R0
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@ -281,6 +253,22 @@ TEXT sys·setcallerpc+0(SB),7,$0
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// MOVL BX, -4(AX) // set calling pc
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// RET
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// runcgo(void(*fn)(void*), void *arg)
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// Just call fn(arg), but first align the stack
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// appropriately for the gcc ABI.
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// TODO(kaib): figure out the arm-gcc ABI
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TEXT runcgo(SB),7,$16
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BL abort(SB)
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// MOVL fn+0(FP), AX
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// MOVL arg+4(FP), BX
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// MOVL SP, CX
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// ANDL $~15, SP // alignment for gcc ABI
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// MOVL CX, 4(SP)
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// MOVL BX, 0(SP)
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// CALL AX
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// MOVL 4(SP), SP
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// RET
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TEXT emptyfunc(SB),0,$0
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RET
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14
src/pkg/runtime/arm/cas.s
Normal file
14
src/pkg/runtime/arm/cas.s
Normal file
@ -0,0 +1,14 @@
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// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// bool cas(int32 *val, int32 old, int32 new)
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// Atomically:
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// if(*val == old){
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// *val = new;
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// return 1;
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// }else
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// return 0;
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TEXT cas+0(SB),0,$12
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TODO
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