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powerpc/lib/sstep: Add bpermd instruction emulation
This adds emulation for the bpermd instruction. Tested for correctness against the bpermd instruction on ppc64le. Signed-off-by: Matt Brown <matthew.brown.dev@gmail.com> Reviewed-by: Cyril Bur <cyrilbur@gmail.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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1 changed files with 23 additions and 1 deletions
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@ -640,6 +640,24 @@ static nokprobe_inline void do_popcnt(struct pt_regs *regs, unsigned long v1,
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regs->gpr[ra] = out; /* popcntd */
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regs->gpr[ra] = out; /* popcntd */
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}
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}
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#ifdef CONFIG_PPC64
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static nokprobe_inline void do_bpermd(struct pt_regs *regs, unsigned long v1,
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unsigned long v2, int ra)
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{
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unsigned char perm, idx;
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unsigned int i;
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perm = 0;
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for (i = 0; i < 8; i++) {
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idx = (v1 >> (i * 8)) & 0xff;
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if (idx < 64)
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if (v2 & PPC_BIT(idx))
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perm |= 1 << i;
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}
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regs->gpr[ra] = perm;
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}
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#endif /* CONFIG_PPC64 */
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static nokprobe_inline int trap_compare(long v1, long v2)
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static nokprobe_inline int trap_compare(long v1, long v2)
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{
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{
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int ret = 0;
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int ret = 0;
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@ -1244,7 +1262,11 @@ int analyse_instr(struct instruction_op *op, struct pt_regs *regs,
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case 124: /* nor */
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case 124: /* nor */
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regs->gpr[ra] = ~(regs->gpr[rd] | regs->gpr[rb]);
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regs->gpr[ra] = ~(regs->gpr[rd] | regs->gpr[rb]);
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goto logical_done;
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goto logical_done;
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#ifdef CONFIG_PPC64
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case 252: /* bpermd */
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do_bpermd(regs, regs->gpr[rd], regs->gpr[rb], ra);
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goto logical_done;
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#endif
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case 284: /* xor */
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case 284: /* xor */
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regs->gpr[ra] = ~(regs->gpr[rd] ^ regs->gpr[rb]);
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regs->gpr[ra] = ~(regs->gpr[rd] ^ regs->gpr[rb]);
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goto logical_done;
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goto logical_done;
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