linux-kernel - [PATCH 3/8] MIPS: regdefs.h: Define a set of register numbers

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Message-Id: <20240209-regname-v1-3-2125efa016ef@flygoat.com>
Date: Fri, 09 Feb 2024 18:07:49 +0000
From: Jiaxun Yang <jiaxun.yang@...goat.com>
To: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: Gregory CLEMENT <gregory.clement@...tlin.com>, 
 linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: [PATCH 3/8] MIPS: regdefs.h: Define a set of register numbers

Define a set of register numbers with their symbolic
names to help with uasm code.

All names are prefixed by GPR_ to prevent naming
clash.

Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
 arch/mips/include/asm/regdef.h | 89 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)

diff --git a/arch/mips/include/asm/regdef.h b/arch/mips/include/asm/regdef.h
index 87ba7be1a847..236051364f78 100644
--- a/arch/mips/include/asm/regdef.h
+++ b/arch/mips/include/asm/regdef.h
@@ -14,6 +14,95 @@
 
 #include <asm/sgidefs.h>
 
+#if _MIPS_SIM == _MIPS_SIM_ABI32
+
+/*
+ * General purpose register numbers for 32 bit ABI
+ */
+#define GPR_ZERO	0	/* wired zero */
+#define GPR_AT	1	/* assembler temp */
+#define GPR_V0	2	/* return value */
+#define GPR_V1	3
+#define GPR_A0	4	/* argument registers */
+#define GPR_A1	5
+#define GPR_A2	6
+#define GPR_A3	7
+#define GPR_T0	8	/* caller saved */
+#define GPR_T1	9
+#define GPR_T2	10
+#define GPR_T3	11
+#define GPR_T4	12
+#define GPR_TA0	12
+#define GPR_T5	13
+#define GPR_TA1	13
+#define GPR_T6	14
+#define GPR_TA2	14
+#define GPR_T7	15
+#define GPR_TA3	15
+#define GPR_S0	16	/* callee saved */
+#define GPR_S1	17
+#define GPR_S2	18
+#define GPR_S3	19
+#define GPR_S4	20
+#define GPR_S5	21
+#define GPR_S6	22
+#define GPR_S7	23
+#define GPR_T8	24	/* caller saved */
+#define GPR_T9	25
+#define GPR_JP	25	/* PIC jump register */
+#define GPR_K0	26	/* kernel scratch */
+#define GPR_K1	27
+#define GPR_GP	28	/* global pointer */
+#define GPR_SP	29	/* stack pointer */
+#define GPR_FP	30	/* frame pointer */
+#define GPR_S8	30	/* same like fp! */
+#define GPR_RA	31	/* return address */
+
+#endif /* _MIPS_SIM == _MIPS_SIM_ABI32 */
+
+#if _MIPS_SIM == _MIPS_SIM_ABI64 || _MIPS_SIM == _MIPS_SIM_NABI32
+
+#define GPR_ZERO	0	/* wired zero */
+#define GPR_AT	1	/* assembler temp */
+#define GPR_V0	2	/* return value - caller saved */
+#define GPR_V1	3
+#define GPR_A0	4	/* argument registers */
+#define GPR_A1	5
+#define GPR_A2	6
+#define GPR_A3	7
+#define GPR_A4	8	/* arg reg 64 bit; caller saved in 32 bit */
+#define GPR_TA0	8
+#define GPR_A5	9
+#define GPR_TA1	9
+#define GPR_A6	10
+#define GPR_TA2	10
+#define GPR_A7	11
+#define GPR_TA3	11
+#define GPR_T0	12	/* caller saved */
+#define GPR_T1	13
+#define GPR_T2	14
+#define GPR_T3	15
+#define GPR_S0	16	/* callee saved */
+#define GPR_S1	17
+#define GPR_S2	18
+#define GPR_S3	19
+#define GPR_S4	20
+#define GPR_S5	21
+#define GPR_S6	22
+#define GPR_S7	23
+#define GPR_T8	24	/* caller saved */
+#define GPR_T9	25	/* callee address for PIC/temp */
+#define GPR_JP	25	/* PIC jump register */
+#define GPR_K0	26	/* kernel temporary */
+#define GPR_K1	27
+#define GPR_GP	28	/* global pointer - caller saved for PIC */
+#define GPR_SP	29	/* stack pointer */
+#define GPR_FP	30	/* frame pointer */
+#define GPR_S8	30	/* callee saved */
+#define GPR_RA	31	/* return address */
+
+#endif /* _MIPS_SIM == _MIPS_SIM_ABI64 || _MIPS_SIM == _MIPS_SIM_NABI32 */
+
 #ifdef __ASSEMBLY__
 #if _MIPS_SIM == _MIPS_SIM_ABI32
 

-- 
2.43.0