VSX vector paired instructions operates with octword (32-byte) operand for loads and stores between storage and a pair of two sequential Vector-Scalar Registers (VSRs). There are 4 word instructions and 2 prefixed instructions that provides this 32-byte storage access operations - lxvp, lxvpx, stxvp, stxvpx, plxvp, pstxvp.
Emulation infrastructure doesn't have support for these instructions, to operate with 32-byte storage access and to operate with 2 VSX registers. This patch series enables the instruction emulation support and adds test cases for them respectively. v3: https://lore.kernel.org/linuxppc-dev/20200731081637.1837559-1-bal...@linux.ibm.com/ Changes in v4: ------------- * Patch #1 is (kind of) new. * Patch #2 now enables both analyse_instr() and emulate_step() unlike prev series where both were in separate patches. * Patch #2 also has important fix for emulation on LE. * Patch #3 and #4. Added XSP/XTP, D0/D1 instruction operands, removed *_EX_OP, __PPC_T[P][X] macros which are incorrect, and adhered to PPC_RAW_* convention. * Added `CPU_FTR_ARCH_31` check in testcases to avoid failing in p8/p9. * Some consmetic changes. * Rebased to powerpc/next Changes in v3: ------------- Worked on review comments and suggestions from Ravi and Naveen, * Fix the do_vsx_load() to handle vsx instructions if MSR_FP/MSR_VEC cleared in exception conditions and it reaches to read/write to thread_struct member fp_state/vr_state respectively. * Fix wrongly used `__vector128 v[2]` in struct vsx_reg as it should hold a single vsx register size. * Remove unnecessary `VSX_CHECK_VEC` flag set and condition to check `VSX_LDLEFT` that is not applicable for these vsx instructions. * Fix comments in emulate_vsx_load() that were misleading. * Rebased on latest powerpc next branch. Changes in v2: ------------- * Fix suggestion from Sandipan, wrap ISA 3.1 instructions with cpu_has_feature(CPU_FTR_ARCH_31) check. * Rebase on latest powerpc next branch. Balamuruhan S (4): powerpc/sstep: Emulate prefixed instructions only when CPU_FTR_ARCH_31 is set powerpc/sstep: Support VSX vector paired storage access instructions powerpc/ppc-opcode: Add encoding macros for VSX vector paired instructions powerpc/sstep: Add testcases for VSX vector paired load/store instructions arch/powerpc/include/asm/ppc-opcode.h | 13 ++ arch/powerpc/lib/sstep.c | 152 +++++++++++++-- arch/powerpc/lib/test_emulate_step.c | 270 ++++++++++++++++++++++++++ 3 files changed, 414 insertions(+), 21 deletions(-) -- 2.26.2
