Implement hashst(p) and hashchk(p) instructions #61
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vcoracolombo
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Mar 31, 2022
Implementation for instructions hashst, hashchk, and its privileged versions. Signed-off-by: Víctor Colombo <[email protected]>
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mferst
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Apr 5, 2022
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| for (int i = 3; i >= 0; i--) { | ||
| k[i] = key & 0xffff; | ||
| key >>= 16; | ||
| } |
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Hum... it's hard to tell if the pseudo-code is using PowerISA-indexing or everybody-else-indexing. The original paper uses "k[m-1]..k[0] = key words," so I'd expect k[0] to be the least significant halfword.
target/ppc/excp_helper.c
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| xright[0] = (x >> 16) & 0xffff; | ||
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| for (int i = 0; i < 28; i++) { | ||
| z |= ((z0 >> (63 - i)) & 1) << 48; |
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It seems that z is set in each iteration, so I think it's not a |=. Also, why << 48?
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<< 48 was because it's setting 15th bit and I assumed it was a 64 bit variable, but it's uint16. Fixed by removing it for now, but I have yet to take a look into the bit ordering issue
| return 0; | ||
| } | ||
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| tcg_gen_addi_tl(ea, cpu_gpr[a->ra], a->rt); |
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"If RA=0, the instruction form is invalid."
Also, if NARROW_MODE(ctx), we need a tcg_gen_ext32u_tl(ea, ea).
Add a method equivalent to CHK_SV that works with decodetree. Use it in hash instructions to optimize when CONFIG_USER_ONLY is defined. Suggested-by: Matheus Ferst <[email protected]> Signed-off-by: Víctor Colombo <[email protected]>
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