target-ppc: implement darn instruction
darn: Deliver A Random Number Currently return invalid random number for all the case. This needs proper algorithm to provide cryptographically suitable random data. Reading from /dev/random can block and that is not an expected behaviour while the cpu instruction is getting executed. Moreover, /dev/random would only work for linux-user Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com> Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com> [dwg: Added minor clang warning fix for ppc32 target] Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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@ -50,6 +50,8 @@ DEF_HELPER_FLAGS_1(cnttzd, TCG_CALL_NO_RWG_SE, tl, tl)
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DEF_HELPER_FLAGS_1(popcntd, TCG_CALL_NO_RWG_SE, tl, tl)
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DEF_HELPER_FLAGS_2(bpermd, TCG_CALL_NO_RWG_SE, i64, i64, i64)
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DEF_HELPER_3(srad, tl, env, tl, tl)
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DEF_HELPER_0(darn32, tl)
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DEF_HELPER_0(darn64, tl)
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#endif
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DEF_HELPER_FLAGS_1(cntlsw32, TCG_CALL_NO_RWG_SE, i32, i32)
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@ -182,6 +182,22 @@ target_ulong helper_cnttzd(target_ulong t)
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{
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return ctz64(t);
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}
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/* Return invalid random number.
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*
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* FIXME: Add rng backend or other mechanism to get cryptographically suitable
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* random number
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*/
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target_ulong helper_darn32(void)
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{
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return -1;
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}
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target_ulong helper_darn64(void)
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{
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return -1;
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}
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#endif
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#if defined(TARGET_PPC64)
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@ -528,6 +528,10 @@ EXTRACT_HELPER(FPW, 16, 1);
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/* addpcis */
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EXTRACT_HELPER_DXFORM(DX, 10, 6, 6, 5, 16, 1, 1, 0, 0)
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#if defined(TARGET_PPC64)
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/* darn */
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EXTRACT_HELPER(L, 16, 2);
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#endif
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/*** Jump target decoding ***/
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/* Immediate address */
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@ -1895,6 +1899,21 @@ static void gen_cnttzd(DisasContext *ctx)
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gen_set_Rc0(ctx, cpu_gpr[rA(ctx->opcode)]);
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}
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}
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/* darn */
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static void gen_darn(DisasContext *ctx)
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{
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int l = L(ctx->opcode);
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if (l == 0) {
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gen_helper_darn32(cpu_gpr[rD(ctx->opcode)]);
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} else if (l <= 2) {
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/* Return 64-bit random for both CRN and RRN */
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gen_helper_darn64(cpu_gpr[rD(ctx->opcode)]);
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} else {
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tcg_gen_movi_i64(cpu_gpr[rD(ctx->opcode)], -1);
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}
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}
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#endif
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/*** Integer rotate ***/
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@ -6216,6 +6235,7 @@ GEN_HANDLER_E(prtyw, 0x1F, 0x1A, 0x04, 0x0000F801, PPC_NONE, PPC2_ISA205),
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GEN_HANDLER(popcntd, 0x1F, 0x1A, 0x0F, 0x0000F801, PPC_POPCNTWD),
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GEN_HANDLER(cntlzd, 0x1F, 0x1A, 0x01, 0x00000000, PPC_64B),
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GEN_HANDLER_E(cnttzd, 0x1F, 0x1A, 0x11, 0x00000000, PPC_NONE, PPC2_ISA300),
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GEN_HANDLER_E(darn, 0x1F, 0x13, 0x17, 0x001CF801, PPC_NONE, PPC2_ISA300),
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GEN_HANDLER_E(prtyd, 0x1F, 0x1A, 0x05, 0x0000F801, PPC_NONE, PPC2_ISA205),
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GEN_HANDLER_E(bpermd, 0x1F, 0x1C, 0x07, 0x00000001, PPC_NONE, PPC2_PERM_ISA206),
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#endif
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