57 lines
1.4 KiB
ArmAsm
57 lines
1.4 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 riscv64, the amd64 one's sibling: stack
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// discipline (add), an intra-file call (probe calling seven, the
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// R_RISCV_CALL pair), an AUIPC+I-type pair against static data (word<>,
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// R_RISCV_PCREL_ITYPE), a symbol-valued DATA field (entry holding
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// seven's address, R_ADDR), NOPTR data outside the GC's type scan
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// (counter) and the data section itself. The callee's result slot sits
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// at the caller's SP+8, the riscv64 ABI0 frame convention.
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// func add(a, b int64) int64
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TEXT ·add(SB), NOSPLIT, $0-24
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MOV a+0(FP), X10
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MOV b+8(FP), X11
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ADD X11, X10, X10
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MOV X10, 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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MOV $7, X10
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MOV X10, 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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MOV 8(SP), X10
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MOV word<>(SB), X11
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ADD X11, X10, X10
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MOV X10, 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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MOV entry(SB), X10
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MOV X10, 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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MOV counter(SB), X10
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MOV X10, 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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