From: David Daney <ddaney@xxxxxxxxxxxxxxxxxx> For cavium, reorder PT ops to be after mfc0 and not before. Also implement a save and restore of the multiplier state so that if it gets corrupted, it will not impact things. Signed-off-by: Tomaso Paoletti <tpaoletti@xxxxxxxxxxxxxxxxxx> Signed-off-by: David Daney <ddaney@xxxxxxxxxxxxxxxxxx> --- arch/mips/include/asm/stackframe.h | 46 ++++++++++++++++++++++++++++++++++++ 1 files changed, 46 insertions(+), 0 deletions(-) diff --git a/arch/mips/include/asm/stackframe.h b/arch/mips/include/asm/stackframe.h index 4c37c4e..bcaac81 100644 --- a/arch/mips/include/asm/stackframe.h +++ b/arch/mips/include/asm/stackframe.h @@ -51,10 +51,12 @@ LONG_S v1, PT_ACX(sp) #else mfhi v1 +#ifndef CONFIG_CPU_CAVIUM_OCTEON LONG_S v1, PT_HI(sp) mflo v1 LONG_S v1, PT_LO(sp) #endif +#endif #ifdef CONFIG_32BIT LONG_S $8, PT_R8(sp) LONG_S $9, PT_R9(sp) @@ -62,10 +64,17 @@ LONG_S $10, PT_R10(sp) LONG_S $11, PT_R11(sp) LONG_S $12, PT_R12(sp) +#ifdef CONFIG_CPU_CAVIUM_OCTEON + LONG_S v1, PT_HI(sp) + mflo v1 +#endif LONG_S $13, PT_R13(sp) LONG_S $14, PT_R14(sp) LONG_S $15, PT_R15(sp) LONG_S $24, PT_R24(sp) +#ifdef CONFIG_CPU_CAVIUM_OCTEON + LONG_S v1, PT_LO(sp) +#endif .endm .macro SAVE_STATIC @@ -166,7 +175,9 @@ LONG_S $0, PT_R0(sp) mfc0 v1, CP0_STATUS LONG_S $2, PT_R2(sp) +#ifndef CONFIG_CPU_CAVIUM_OCTEON LONG_S v1, PT_STATUS(sp) +#endif #ifdef CONFIG_MIPS_MT_SMTC /* * Ideally, these instructions would be shuffled in @@ -178,22 +189,53 @@ LONG_S v1, PT_TCSTATUS(sp) #endif /* CONFIG_MIPS_MT_SMTC */ LONG_S $4, PT_R4(sp) +#ifndef CONFIG_CPU_CAVIUM_OCTEON mfc0 v1, CP0_CAUSE +#endif LONG_S $5, PT_R5(sp) +#ifdef CONFIG_CPU_CAVIUM_OCTEON + LONG_S v1, PT_STATUS(sp) + mfc0 v1, CP0_CAUSE +#else LONG_S v1, PT_CAUSE(sp) +#endif LONG_S $6, PT_R6(sp) +#ifndef CONFIG_CPU_CAVIUM_OCTEON MFC0 v1, CP0_EPC +#endif LONG_S $7, PT_R7(sp) +#ifdef CONFIG_CPU_CAVIUM_OCTEON + LONG_S v1, PT_CAUSE(sp) + MFC0 v1, CP0_EPC +#endif #ifdef CONFIG_64BIT LONG_S $8, PT_R8(sp) LONG_S $9, PT_R9(sp) #endif +#ifndef CONFIG_CPU_CAVIUM_OCTEON LONG_S v1, PT_EPC(sp) +#endif LONG_S $25, PT_R25(sp) LONG_S $28, PT_R28(sp) LONG_S $31, PT_R31(sp) +#ifdef CONFIG_CPU_CAVIUM_OCTEON + LONG_S v1, PT_EPC(sp) +#endif ori $28, sp, _THREAD_MASK xori $28, _THREAD_MASK +#ifdef CONFIG_CPU_CAVIUM_OCTEON + .set mips64 + pref 0, 0($28) /* Prefetch the current pointer */ + pref 0, PT_R31(sp) /* Prefetch the $31(ra) */ + /* The Octeon multiplier state is affected by general multiply + instructions. It must be saved before and kernel code might + corrupt it */ + jal octeon_mult_save + LONG_L v1, 0($28) /* Load the current pointer */ + /* Restore $31(ra) that was changed by the jal */ + LONG_L ra, PT_R31(sp) + pref 0, 0(v1) /* Prefetch the current thread */ +#endif .set pop .endm @@ -324,6 +366,10 @@ DVPE 5 # dvpe a1 jal mips_ihb #endif /* CONFIG_MIPS_MT_SMTC */ +#ifdef CONFIG_CPU_CAVIUM_OCTEON + /* Restore the Octeon multiplier state */ + jal octeon_mult_restore +#endif mfc0 a0, CP0_STATUS ori a0, STATMASK xori a0, STATMASK -- 1.5.5.1
