2026-08-30 11:27:54 +02:00
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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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// func cleanAdd(a, b int64) int64
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// A well-behaved function that preserves all callee-saved registers.
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TEXT ·cleanAdd(SB), NOSPLIT, $0-24
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MOVD a+0(FP), R0
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MOVD b+8(FP), R1
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ADD R0, R1, R0
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MOVD R0, ret+16(FP)
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RET
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// func dirtyFP(a int64) int64
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// Deliberately clobbers R29, the frame pointer (an ABI violation for a
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// NOSPLIT frame=0 function).
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TEXT ·dirtyFP(SB), NOSPLIT, $0-16
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MOVD $0x1234, R29
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MOVD a+0(FP), R0
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MOVD R0, ret+8(FP)
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RET
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// func dirtyG(a int64) int64
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2026-09-20 00:38:24 +02:00
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// Deliberately clobbers g, the goroutine pointer (R28; a serious ABI violation).
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2026-08-30 11:27:54 +02:00
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TEXT ·dirtyG(SB), NOSPLIT, $0-16
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2026-09-20 00:38:24 +02:00
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MOVD $0x5678, g
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2026-08-30 11:27:54 +02:00
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MOVD a+0(FP), R0
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MOVD R0, ret+8(FP)
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RET
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