56 lines
1.3 KiB
ArmAsm
56 lines
1.3 KiB
ArmAsm
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// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
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// SPDX-License-Identifier: BSD-3-Clause
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#include "textflag.h"
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// The link-regression kernel for amd64. One file exercises every GOOBJ
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// record a small assembly contribution to a program needs: plain stack
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// discipline (add), an intra-file call (probe calling seven, R_CALL), a
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// code-to-data reference (word<>, R_PCREL), a symbol-valued DATA field
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// (entry holding seven's address, R_ADDR), NOPTR data outside the GC's
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// type scan (counter) and the data section itself.
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// func add(a, b int64) int64
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TEXT ·add(SB), NOSPLIT, $0-24
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MOVQ a+0(FP), AX
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MOVQ b+8(FP), CX
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ADDQ CX, AX
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MOVQ AX, ret+16(FP)
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RET
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// func seven() int64
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TEXT ·seven(SB), NOSPLIT, $0-8
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MOVQ $7, AX
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MOVQ AX, ret+0(FP)
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RET
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// func probe() int64 = seven() + word<>(SB)
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TEXT ·probe(SB), NOSPLIT, $8-8
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CALL ·seven(SB)
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MOVQ (SP), AX
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MOVQ word<>(SB), CX
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ADDQ CX, AX
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MOVQ AX, ret+0(FP)
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RET
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// func entryAddr() uintptr
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TEXT ·entryAddr(SB), NOSPLIT, $0-8
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MOVQ entry(SB), AX
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MOVQ AX, ret+0(FP)
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RET
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// func counterVal() int64
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TEXT ·counterVal(SB), NOSPLIT, $0-8
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MOVQ counter(SB), AX
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MOVQ AX, ret+0(FP)
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RET
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GLOBL word<>(SB), RODATA, $8
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DATA word<>+0(SB)/8, $0x0fedcba987654321
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GLOBL entry(SB), RODATA, $8
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DATA entry+0(SB)/8, $·seven(SB)
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GLOBL counter(SB), NOPTR, $8
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DATA counter+0(SB)/8, $1234
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