Re: [PATCH v2] MIPS: Avoid macro redefinitions
From: Nick Desaulniers
Date: Tue Sep 14 2021 - 11:57:17 EST
On Mon, Sep 13, 2021 at 2:34 PM Paul Cercueil <paul@xxxxxxxxxxxxxxx> wrote:
>
> To be able to compile the kernel with LTO, the assembler macros cannot
> be declared in the global scope, or the compiler will complain about
> redefined macros.
>
> Update the code so that macros are defined then undefined when they are
> used.
>
> Note that virt support was added in 2.24 and xpa in 2.25. So we still
> need the TOOLCHAIN defines for them.
>
> Signed-off-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
> ---
>
> Notes:
> v2: Removed commented undef line
Hi Paul, thanks for the v2. I think the point of the #undef was that
the _IFC_REG doesn't make sense outside of this header, so they
probably did not want to pollute the namespace for preprocessor
defines. As such, I think it should actually stay, not be removed (or
commented out).
>
> arch/mips/include/asm/ginvt.h | 11 +-
> .../asm/mach-loongson64/loongson_regs.h | 12 ++
> arch/mips/include/asm/mipsregs.h | 190 +++++++++++-------
> arch/mips/include/asm/msa.h | 34 +++-
> 4 files changed, 155 insertions(+), 92 deletions(-)
>
> diff --git a/arch/mips/include/asm/ginvt.h b/arch/mips/include/asm/ginvt.h
> index 6eb7c2b94dc7..87b2974ffc53 100644
> --- a/arch/mips/include/asm/ginvt.h
> +++ b/arch/mips/include/asm/ginvt.h
> @@ -12,11 +12,13 @@ enum ginvt_type {
>
> #ifdef TOOLCHAIN_SUPPORTS_GINV
> # define _ASM_SET_GINV ".set ginv\n"
> +# define _ASM_UNSET_GINV
> #else
> -_ASM_MACRO_1R1I(ginvt, rs, type,
> - _ASM_INSN_IF_MIPS(0x7c0000bd | (__rs << 21) | (\\type << 8))
> - _ASM_INSN32_IF_MM(0x0000717c | (__rs << 16) | (\\type << 9)));
> -# define _ASM_SET_GINV
> +# define _ASM_SET_GINV \
> + _ASM_MACRO_1R1I(ginvt, rs, type, \
> + _ASM_INSN_IF_MIPS(0x7c0000bd | (__rs << 21) | (\\type << 8)) \
> + _ASM_INSN32_IF_MM(0x0000717c | (__rs << 16) | (\\type << 9)))
> +# define _ASM_UNSET_GINV ".purgem ginvt\n"
> #endif
>
> static __always_inline void ginvt(unsigned long addr, enum ginvt_type type)
> @@ -25,6 +27,7 @@ static __always_inline void ginvt(unsigned long addr, enum ginvt_type type)
> ".set push\n"
> _ASM_SET_GINV
> " ginvt %0, %1\n"
> + _ASM_UNSET_GINV
> ".set pop"
> : /* no outputs */
> : "r"(addr), "i"(type)
> diff --git a/arch/mips/include/asm/mach-loongson64/loongson_regs.h b/arch/mips/include/asm/mach-loongson64/loongson_regs.h
> index 165993514762..b5be7511f6cd 100644
> --- a/arch/mips/include/asm/mach-loongson64/loongson_regs.h
> +++ b/arch/mips/include/asm/mach-loongson64/loongson_regs.h
> @@ -21,8 +21,10 @@ static inline u32 read_cpucfg(u32 reg)
> u32 __res;
>
> __asm__ __volatile__(
> + _ASM_SET_PARSE_R
> "parse_r __res,%0\n\t"
> "parse_r reg,%1\n\t"
> + _ASM_UNSET_PARSE_R
> ".insn \n\t"
> ".word (0xc8080118 | (reg << 21) | (__res << 11))\n\t"
> :"=r"(__res)
> @@ -143,8 +145,10 @@ static inline u32 csr_readl(u32 reg)
>
> /* RDCSR reg, val */
> __asm__ __volatile__(
> + _ASM_SET_PARSE_R
> "parse_r __res,%0\n\t"
> "parse_r reg,%1\n\t"
> + _ASM_UNSET_PARSE_R
> ".insn \n\t"
> ".word (0xc8000118 | (reg << 21) | (__res << 11))\n\t"
> :"=r"(__res)
> @@ -160,8 +164,10 @@ static inline u64 csr_readq(u32 reg)
>
> /* DRDCSR reg, val */
> __asm__ __volatile__(
> + _ASM_SET_PARSE_R
> "parse_r __res,%0\n\t"
> "parse_r reg,%1\n\t"
> + _ASM_UNSET_PARSE_R
> ".insn \n\t"
> ".word (0xc8020118 | (reg << 21) | (__res << 11))\n\t"
> :"=r"(__res)
> @@ -175,8 +181,10 @@ static inline void csr_writel(u32 val, u32 reg)
> {
> /* WRCSR reg, val */
> __asm__ __volatile__(
> + _ASM_SET_PARSE_R
> "parse_r reg,%0\n\t"
> "parse_r val,%1\n\t"
> + _ASM_UNSET_PARSE_R
> ".insn \n\t"
> ".word (0xc8010118 | (reg << 21) | (val << 11))\n\t"
> :
> @@ -189,8 +197,10 @@ static inline void csr_writeq(u64 val, u32 reg)
> {
> /* DWRCSR reg, val */
> __asm__ __volatile__(
> + _ASM_SET_PARSE_R
> "parse_r reg,%0\n\t"
> "parse_r val,%1\n\t"
> + _ASM_UNSET_PARSE_R
> ".insn \n\t"
> ".word (0xc8030118 | (reg << 21) | (val << 11))\n\t"
> :
> @@ -243,8 +253,10 @@ static inline u64 drdtime(void)
> u64 val = 0;
>
> __asm__ __volatile__(
> + _ASM_SET_PARSE_R
> "parse_r rID,%0\n\t"
> "parse_r val,%1\n\t"
> + _ASM_UNSET_PARSE_R
> ".insn \n\t"
> ".word (0xc8090118 | (rID << 21) | (val << 11))\n\t"
> :"=r"(rID),"=r"(val)
> diff --git a/arch/mips/include/asm/mipsregs.h b/arch/mips/include/asm/mipsregs.h
> index acdf8c69220b..2616353b940c 100644
> --- a/arch/mips/include/asm/mipsregs.h
> +++ b/arch/mips/include/asm/mipsregs.h
> @@ -1297,22 +1297,22 @@ static inline int mm_insn_16bit(u16 insn)
> "\\var = " #n "\n\t" \
> ".endif\n\t"
>
> -__asm__(".macro parse_r var r\n\t"
> - "\\var = -1\n\t"
> - _IFC_REG(0) _IFC_REG(1) _IFC_REG(2) _IFC_REG(3)
> - _IFC_REG(4) _IFC_REG(5) _IFC_REG(6) _IFC_REG(7)
> - _IFC_REG(8) _IFC_REG(9) _IFC_REG(10) _IFC_REG(11)
> - _IFC_REG(12) _IFC_REG(13) _IFC_REG(14) _IFC_REG(15)
> - _IFC_REG(16) _IFC_REG(17) _IFC_REG(18) _IFC_REG(19)
> - _IFC_REG(20) _IFC_REG(21) _IFC_REG(22) _IFC_REG(23)
> - _IFC_REG(24) _IFC_REG(25) _IFC_REG(26) _IFC_REG(27)
> - _IFC_REG(28) _IFC_REG(29) _IFC_REG(30) _IFC_REG(31)
> - ".iflt \\var\n\t"
> - ".error \"Unable to parse register name \\r\"\n\t"
> - ".endif\n\t"
> - ".endm");
> -
> -#undef _IFC_REG
^ ie. I don't think we want to remove this undef.
> +#define _ASM_SET_PARSE_R \
> + ".macro parse_r var r\n\t" \
> + "\\var = -1\n\t" \
> + _IFC_REG(0) _IFC_REG(1) _IFC_REG(2) _IFC_REG(3) \
> + _IFC_REG(4) _IFC_REG(5) _IFC_REG(6) _IFC_REG(7) \
> + _IFC_REG(8) _IFC_REG(9) _IFC_REG(10) _IFC_REG(11) \
> + _IFC_REG(12) _IFC_REG(13) _IFC_REG(14) _IFC_REG(15) \
> + _IFC_REG(16) _IFC_REG(17) _IFC_REG(18) _IFC_REG(19) \
> + _IFC_REG(20) _IFC_REG(21) _IFC_REG(22) _IFC_REG(23) \
> + _IFC_REG(24) _IFC_REG(25) _IFC_REG(26) _IFC_REG(27) \
> + _IFC_REG(28) _IFC_REG(29) _IFC_REG(30) _IFC_REG(31) \
> + ".iflt \\var\n\t" \
> + ".error \"Unable to parse register name \\r\"\n\t" \
> + ".endif\n\t" \
> + ".endm\n\t"
> +#define _ASM_UNSET_PARSE_R ".purgem parse_r\n\t"
>
> /*
> * C macros for generating assembler macros for common instruction formats.
> @@ -1322,43 +1322,45 @@ __asm__(".macro parse_r var r\n\t"
> * the ENC encodings.
> */
>
> -/* Instructions with no operands */
> -#define _ASM_MACRO_0(OP, ENC) \
> - __asm__(".macro " #OP "\n\t" \
> - ENC \
> - ".endm")
> -
> /* Instructions with 1 register operand & 1 immediate operand */
> #define _ASM_MACRO_1R1I(OP, R1, I2, ENC) \
> - __asm__(".macro " #OP " " #R1 ", " #I2 "\n\t" \
> + ".macro " #OP " " #R1 ", " #I2 "\n\t" \
> + _ASM_SET_PARSE_R \
> "parse_r __" #R1 ", \\" #R1 "\n\t" \
> ENC \
> - ".endm")
> + _ASM_UNSET_PARSE_R \
> + ".endm\n\t"
>
> /* Instructions with 2 register operands */
> #define _ASM_MACRO_2R(OP, R1, R2, ENC) \
> - __asm__(".macro " #OP " " #R1 ", " #R2 "\n\t" \
> + ".macro " #OP " " #R1 ", " #R2 "\n\t" \
> + _ASM_SET_PARSE_R \
> "parse_r __" #R1 ", \\" #R1 "\n\t" \
> "parse_r __" #R2 ", \\" #R2 "\n\t" \
> ENC \
> - ".endm")
> + _ASM_UNSET_PARSE_R \
> + ".endm\n\t"
>
> /* Instructions with 3 register operands */
> #define _ASM_MACRO_3R(OP, R1, R2, R3, ENC) \
> - __asm__(".macro " #OP " " #R1 ", " #R2 ", " #R3 "\n\t" \
> + ".macro " #OP " " #R1 ", " #R2 ", " #R3 "\n\t" \
> + _ASM_SET_PARSE_R \
> "parse_r __" #R1 ", \\" #R1 "\n\t" \
> "parse_r __" #R2 ", \\" #R2 "\n\t" \
> "parse_r __" #R3 ", \\" #R3 "\n\t" \
> ENC \
> - ".endm")
> + _ASM_UNSET_PARSE_R \
> + ".endm\n\t"
>
> /* Instructions with 2 register operands and 1 optional select operand */
> #define _ASM_MACRO_2R_1S(OP, R1, R2, SEL3, ENC) \
> - __asm__(".macro " #OP " " #R1 ", " #R2 ", " #SEL3 " = 0\n\t" \
> + ".macro " #OP " " #R1 ", " #R2 ", " #SEL3 " = 0\n\t" \
> + _ASM_SET_PARSE_R \
> "parse_r __" #R1 ", \\" #R1 "\n\t" \
> "parse_r __" #R2 ", \\" #R2 "\n\t" \
> ENC \
> - ".endm")
> + _ASM_UNSET_PARSE_R \
> + ".endm\n\t"
>
> /*
> * TLB Invalidate Flush
> @@ -1618,15 +1620,21 @@ do { \
> } while (0)
>
> #ifndef TOOLCHAIN_SUPPORTS_XPA
> -_ASM_MACRO_2R_1S(mfhc0, rt, rs, sel,
> - _ASM_INSN_IF_MIPS(0x40400000 | __rt << 16 | __rs << 11 | \\sel)
> - _ASM_INSN32_IF_MM(0x000000f4 | __rt << 21 | __rs << 16 | \\sel << 11));
> -_ASM_MACRO_2R_1S(mthc0, rt, rd, sel,
> - _ASM_INSN_IF_MIPS(0x40c00000 | __rt << 16 | __rd << 11 | \\sel)
> - _ASM_INSN32_IF_MM(0x000002f4 | __rt << 21 | __rd << 16 | \\sel << 11));
> -#define _ASM_SET_XPA ""
> +#define _ASM_SET_MFHC0 \
> + _ASM_MACRO_2R_1S(mfhc0, rt, rs, sel, \
> + _ASM_INSN_IF_MIPS(0x40400000 | __rt << 16 | __rs << 11 | \\sel) \
> + _ASM_INSN32_IF_MM(0x000000f4 | __rt << 21 | __rs << 16 | \\sel << 11))
> +#define _ASM_UNSET_MFHC0 ".purgem mfhc0\n\t"
> +#define _ASM_SET_MTHC0 \
> + _ASM_MACRO_2R_1S(mthc0, rt, rd, sel, \
> + _ASM_INSN_IF_MIPS(0x40c00000 | __rt << 16 | __rd << 11 | \\sel) \
> + _ASM_INSN32_IF_MM(0x000002f4 | __rt << 21 | __rd << 16 | \\sel << 11))
> +#define _ASM_UNSET_MTHC0 ".purgem mthc0\n\t"
> #else /* !TOOLCHAIN_SUPPORTS_XPA */
> -#define _ASM_SET_XPA ".set\txpa\n\t"
> +#define _ASM_SET_MFHC0 ".set\txpa\n\t"
> +#define _ASM_SET_MTHC0 ".set\txpa\n\t"
> +#define _ASM_UNSET_MFHC0
> +#define _ASM_UNSET_MTHC0
> #endif
>
> #define __readx_32bit_c0_register(source, sel) \
> @@ -1636,8 +1644,9 @@ _ASM_MACRO_2R_1S(mthc0, rt, rd, sel,
> __asm__ __volatile__( \
> " .set push \n" \
> " .set mips32r2 \n" \
> - _ASM_SET_XPA \
> + _ASM_SET_MFHC0 \
> " mfhc0 %0, " #source ", %1 \n" \
> + _ASM_UNSET_MFHC0 \
> " .set pop \n" \
> : "=r" (__res) \
> : "i" (sel)); \
> @@ -1649,8 +1658,9 @@ do { \
> __asm__ __volatile__( \
> " .set push \n" \
> " .set mips32r2 \n" \
> - _ASM_SET_XPA \
> + _ASM_SET_MTHC0 \
> " mthc0 %z0, " #register ", %1 \n" \
> + _ASM_UNSET_MTHC0 \
> " .set pop \n" \
> : \
> : "Jr" (value), "i" (sel)); \
> @@ -2046,31 +2056,58 @@ do { \
> */
>
> #ifndef TOOLCHAIN_SUPPORTS_VIRT
> -_ASM_MACRO_2R_1S(mfgc0, rt, rs, sel,
> - _ASM_INSN_IF_MIPS(0x40600000 | __rt << 16 | __rs << 11 | \\sel)
> - _ASM_INSN32_IF_MM(0x000004fc | __rt << 21 | __rs << 16 | \\sel << 11));
> -_ASM_MACRO_2R_1S(dmfgc0, rt, rs, sel,
> - _ASM_INSN_IF_MIPS(0x40600100 | __rt << 16 | __rs << 11 | \\sel)
> - _ASM_INSN32_IF_MM(0x580004fc | __rt << 21 | __rs << 16 | \\sel << 11));
> -_ASM_MACRO_2R_1S(mtgc0, rt, rd, sel,
> - _ASM_INSN_IF_MIPS(0x40600200 | __rt << 16 | __rd << 11 | \\sel)
> - _ASM_INSN32_IF_MM(0x000006fc | __rt << 21 | __rd << 16 | \\sel << 11));
> -_ASM_MACRO_2R_1S(dmtgc0, rt, rd, sel,
> - _ASM_INSN_IF_MIPS(0x40600300 | __rt << 16 | __rd << 11 | \\sel)
> - _ASM_INSN32_IF_MM(0x580006fc | __rt << 21 | __rd << 16 | \\sel << 11));
> -_ASM_MACRO_0(tlbgp, _ASM_INSN_IF_MIPS(0x42000010)
> - _ASM_INSN32_IF_MM(0x0000017c));
> -_ASM_MACRO_0(tlbgr, _ASM_INSN_IF_MIPS(0x42000009)
> - _ASM_INSN32_IF_MM(0x0000117c));
> -_ASM_MACRO_0(tlbgwi, _ASM_INSN_IF_MIPS(0x4200000a)
> - _ASM_INSN32_IF_MM(0x0000217c));
> -_ASM_MACRO_0(tlbgwr, _ASM_INSN_IF_MIPS(0x4200000e)
> - _ASM_INSN32_IF_MM(0x0000317c));
> -_ASM_MACRO_0(tlbginvf, _ASM_INSN_IF_MIPS(0x4200000c)
> - _ASM_INSN32_IF_MM(0x0000517c));
> -#define _ASM_SET_VIRT ""
> +#define _ASM_SET_MFGC0 \
> + _ASM_MACRO_2R_1S(mfgc0, rt, rs, sel, \
> + _ASM_INSN_IF_MIPS(0x40600000 | __rt << 16 | __rs << 11 | \\sel) \
> + _ASM_INSN32_IF_MM(0x000004fc | __rt << 21 | __rs << 16 | \\sel << 11))
> +#define _ASM_UNSET_MFGC0 ".purgem mfgc0\n\t"
> +#define _ASM_SET_DMFGC0 \
> + _ASM_MACRO_2R_1S(dmfgc0, rt, rs, sel, \
> + _ASM_INSN_IF_MIPS(0x40600100 | __rt << 16 | __rs << 11 | \\sel) \
> + _ASM_INSN32_IF_MM(0x580004fc | __rt << 21 | __rs << 16 | \\sel << 11))
> +#define _ASM_UNSET_DMFGC0 ".purgem dmfgc0\n\t"
> +#define _ASM_SET_MTGC0 \
> + _ASM_MACRO_2R_1S(mtgc0, rt, rd, sel, \
> + _ASM_INSN_IF_MIPS(0x40600200 | __rt << 16 | __rd << 11 | \\sel) \
> + _ASM_INSN32_IF_MM(0x000006fc | __rt << 21 | __rd << 16 | \\sel << 11))
> +#define _ASM_UNSET_MTGC0 ".purgem mtgc0\n\t"
> +#define _ASM_SET_DMTGC0 \
> + _ASM_MACRO_2R_1S(dmtgc0, rt, rd, sel, \
> + _ASM_INSN_IF_MIPS(0x40600300 | __rt << 16 | __rd << 11 | \\sel) \
> + _ASM_INSN32_IF_MM(0x580006fc | __rt << 21 | __rd << 16 | \\sel << 11))
> +#define _ASM_UNSET_DMTGC0 ".purgem dmtgc0\n\t"
> +
> +#define __tlbgp() \
> + _ASM_INSN_IF_MIPS(0x42000010) \
> + _ASM_INSN32_IF_MM(0x0000017c)
> +#define __tlbgr() \
> + _ASM_INSN_IF_MIPS(0x42000009) \
> + _ASM_INSN32_IF_MM(0x0000117c)
> +#define __tlbgwi() \
> + _ASM_INSN_IF_MIPS(0x4200000a) \
> + _ASM_INSN32_IF_MM(0x0000217c)
> +#define __tlbgwr() \
> + _ASM_INSN_IF_MIPS(0x4200000e) \
> + _ASM_INSN32_IF_MM(0x0000317c)
> +#define __tlbginvf() \
> + _ASM_INSN_IF_MIPS(0x4200000c) \
> + _ASM_INSN32_IF_MM(0x0000517c)
> #else /* !TOOLCHAIN_SUPPORTS_VIRT */
> #define _ASM_SET_VIRT ".set\tvirt\n\t"
> +#define _ASM_SET_MFGC0 _ASM_SET_VIRT
> +#define _ASM_SET_DMFGC0 _ASM_SET_VIRT
> +#define _ASM_SET_MTGC0 _ASM_SET_VIRT
> +#define _ASM_SET_DMTGC0 _ASM_SET_VIRT
> +#define _ASM_UNSET_MFGC0
> +#define _ASM_UNSET_DMFGC0
> +#define _ASM_UNSET_MTGC0
> +#define _ASM_UNSET_DMTGC0
> +
> +#define __tlbgp() _ASM_SET_VIRT "tlbgp\n\t"
> +#define __tlbgr() _ASM_SET_VIRT "tlbgr\n\t"
> +#define __tlbgwi() _ASM_SET_VIRT "tlbgwi\n\t"
> +#define __tlbgwr() _ASM_SET_VIRT "tlbgwr\n\t"
> +#define __tlbginvf() _ASM_SET_VIRT "tlbginvf\n\t"
> #endif
>
> #define __read_32bit_gc0_register(source, sel) \
> @@ -2078,8 +2115,9 @@ _ASM_MACRO_0(tlbginvf, _ASM_INSN_IF_MIPS(0x4200000c)
> __asm__ __volatile__( \
> ".set\tpush\n\t" \
> ".set\tmips32r5\n\t" \
> - _ASM_SET_VIRT \
> + _ASM_SET_MFGC0 \
> "mfgc0\t%0, " #source ", %1\n\t" \
> + _ASM_UNSET_MFGC0 \
> ".set\tpop" \
> : "=r" (__res) \
> : "i" (sel)); \
> @@ -2091,8 +2129,9 @@ _ASM_MACRO_0(tlbginvf, _ASM_INSN_IF_MIPS(0x4200000c)
> __asm__ __volatile__( \
> ".set\tpush\n\t" \
> ".set\tmips64r5\n\t" \
> - _ASM_SET_VIRT \
> + _ASM_SET_DMFGC0 \
> "dmfgc0\t%0, " #source ", %1\n\t" \
> + _ASM_UNSET_DMFGC0 \
> ".set\tpop" \
> : "=r" (__res) \
> : "i" (sel)); \
> @@ -2104,8 +2143,9 @@ do { \
> __asm__ __volatile__( \
> ".set\tpush\n\t" \
> ".set\tmips32r5\n\t" \
> - _ASM_SET_VIRT \
> + _ASM_SET_MTGC0 \
> "mtgc0\t%z0, " #register ", %1\n\t" \
> + _ASM_UNSET_MTGC0 \
> ".set\tpop" \
> : : "Jr" ((unsigned int)(value)), \
> "i" (sel)); \
> @@ -2116,8 +2156,9 @@ do { \
> __asm__ __volatile__( \
> ".set\tpush\n\t" \
> ".set\tmips64r5\n\t" \
> - _ASM_SET_VIRT \
> + _ASM_SET_DMTGC0 \
> "dmtgc0\t%z0, " #register ", %1\n\t" \
> + _ASM_UNSET_DMTGC0 \
> ".set\tpop" \
> : : "Jr" (value), \
> "i" (sel)); \
> @@ -2788,8 +2829,7 @@ static inline void guest_tlb_probe(void)
> __asm__ __volatile__(
> ".set push\n\t"
> ".set noreorder\n\t"
> - _ASM_SET_VIRT
> - "tlbgp\n\t"
> + __tlbgp()
> ".set pop");
> }
>
> @@ -2798,8 +2838,7 @@ static inline void guest_tlb_read(void)
> __asm__ __volatile__(
> ".set push\n\t"
> ".set noreorder\n\t"
> - _ASM_SET_VIRT
> - "tlbgr\n\t"
> + __tlbgr()
> ".set pop");
> }
>
> @@ -2808,8 +2847,7 @@ static inline void guest_tlb_write_indexed(void)
> __asm__ __volatile__(
> ".set push\n\t"
> ".set noreorder\n\t"
> - _ASM_SET_VIRT
> - "tlbgwi\n\t"
> + __tlbgwi()
> ".set pop");
> }
>
> @@ -2818,8 +2856,7 @@ static inline void guest_tlb_write_random(void)
> __asm__ __volatile__(
> ".set push\n\t"
> ".set noreorder\n\t"
> - _ASM_SET_VIRT
> - "tlbgwr\n\t"
> + __tlbgwr()
> ".set pop");
> }
>
> @@ -2831,8 +2868,7 @@ static inline void guest_tlbinvf(void)
> __asm__ __volatile__(
> ".set push\n\t"
> ".set noreorder\n\t"
> - _ASM_SET_VIRT
> - "tlbginvf\n\t"
> + __tlbginvf()
> ".set pop");
> }
>
> diff --git a/arch/mips/include/asm/msa.h b/arch/mips/include/asm/msa.h
> index e0a3dd52334d..236a49ee2e3e 100644
> --- a/arch/mips/include/asm/msa.h
> +++ b/arch/mips/include/asm/msa.h
> @@ -162,16 +162,26 @@ static inline void init_msa_upper(void)
> * to allow compilation with toolchains that do not support MSA. Once all
> * toolchains in use support MSA these can be removed.
> */
> -_ASM_MACRO_2R(cfcmsa, rd, cs,
> - _ASM_INSN_IF_MIPS(0x787e0019 | __cs << 11 | __rd << 6)
> - _ASM_INSN32_IF_MM(0x587e0016 | __cs << 11 | __rd << 6));
> -_ASM_MACRO_2R(ctcmsa, cd, rs,
> - _ASM_INSN_IF_MIPS(0x783e0019 | __rs << 11 | __cd << 6)
> - _ASM_INSN32_IF_MM(0x583e0016 | __rs << 11 | __cd << 6));
> -#define _ASM_SET_MSA ""
> +
> +#define _ASM_SET_CFCMSA \
> + _ASM_MACRO_2R(cfcmsa, rd, cs, \
> + _ASM_INSN_IF_MIPS(0x787e0019 | __cs << 11 | __rd << 6) \
> + _ASM_INSN32_IF_MM(0x587e0016 | __cs << 11 | __rd << 6))
> +#define _ASM_UNSET_CFCMSA ".purgem cfcmsa\n\t"
> +#define _ASM_SET_CTCMSA \
> + _ASM_MACRO_2R(ctcmsa, cd, rs, \
> + _ASM_INSN_IF_MIPS(0x783e0019 | __rs << 11 | __cd << 6) \
> + _ASM_INSN32_IF_MM(0x583e0016 | __rs << 11 | __cd << 6))
> +#define _ASM_UNSET_CTCMSA ".purgem ctcmsa\n\t"
> #else /* TOOLCHAIN_SUPPORTS_MSA */
> -#define _ASM_SET_MSA ".set\tfp=64\n\t" \
> - ".set\tmsa\n\t"
> +#define _ASM_SET_CFCMSA \
> + ".set\tfp=64\n\t" \
> + ".set\tmsa\n\t"
> +#define _ASM_UNSET_CFCMSA
> +#define _ASM_SET_CTCMSA \
> + ".set\tfp=64\n\t" \
> + ".set\tmsa\n\t"
> +#define _ASM_UNSET_CTCMSA
> #endif
>
> #define __BUILD_MSA_CTL_REG(name, cs) \
> @@ -180,8 +190,9 @@ static inline unsigned int read_msa_##name(void) \
> unsigned int reg; \
> __asm__ __volatile__( \
> " .set push\n" \
> - _ASM_SET_MSA \
> + _ASM_SET_CFCMSA \
> " cfcmsa %0, $" #cs "\n" \
> + _ASM_UNSET_CFCMSA \
> " .set pop\n" \
> : "=r"(reg)); \
> return reg; \
> @@ -191,8 +202,9 @@ static inline void write_msa_##name(unsigned int val) \
> { \
> __asm__ __volatile__( \
> " .set push\n" \
> - _ASM_SET_MSA \
> + _ASM_SET_CTCMSA \
> " ctcmsa $" #cs ", %0\n" \
> + _ASM_UNSET_CTCMSA \
> " .set pop\n" \
> : : "r"(val)); \
> }
> --
> 2.33.0
>
--
Thanks,
~Nick Desaulniers