linux-kernel - [PATCH 4/7] LoongArch: Add gpr-num.h

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Date:   Mon, 10 Oct 2022 17:32:17 +0800
From:   Youling Tang <tangyouling@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>
Cc:     WANG Xuerui <kernel@...0n.name>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        Alexei Starovoitov <ast@...nel.org>, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        bpf@...r.kernel.org
Subject: [PATCH 4/7] LoongArch: Add gpr-num.h

In subsequent patches we'll need to map the same GPR names to integer
constants so that we can use this to build metadata for exception
fixups.

The compiler treats gpr 0 as zero, not $r0, so set it separately to
.L__gpr_num_zero, otherwise the following assembly error will occur,

{standard input}: Assembler messages:
{standard input}:1074: Error: invalid operands (*UND* and *ABS* sections) for `<<'
{standard input}:1160: Error: invalid operands (*UND* and *ABS* sections) for `<<'
make[1]: *** [scripts/Makefile.build:249: fs/fcntl.o] Error 1

Signed-off-by: Youling Tang <tangyouling@...ngson.cn>
---
 arch/loongarch/include/asm/gpr-num.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
 create mode 100644 arch/loongarch/include/asm/gpr-num.h

diff --git a/arch/loongarch/include/asm/gpr-num.h b/arch/loongarch/include/asm/gpr-num.h
new file mode 100644
index 000000000000..e0941af20c7e
--- /dev/null
+++ b/arch/loongarch/include/asm/gpr-num.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __ASM_GPR_NUM_H
+#define __ASM_GPR_NUM_H
+
+#ifdef __ASSEMBLY__
+
+	.equ	.L__gpr_num_zero, 0
+	.irp	num,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31
+	.equ	.L__gpr_num_$r\num, \num
+	.endr
+
+#else /* __ASSEMBLY__ */
+
+#define __DEFINE_ASM_GPR_NUMS					\
+"	.equ	.L__gpr_num_zero, 0\n"				\
+"	.irp	num,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31\n" \
+"	.equ	.L__gpr_num_$r\\num, \\num\n"			\
+"	.endr\n"						\
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* __ASM_GPR_NUM_H */
-- 
2.36.1