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| author | Ravi Bangoria | 2016-09-16 12:51:47 +0200 |
|---|---|---|
| committer | David Gibson | 2016-09-23 04:38:40 +0200 |
| commit | fec5c62a6434bc306906972e276c5a6f2cafdd9a (patch) | |
| tree | 538ab36157eac326e31aa16331ea31cc560a6ea8 /target-ppc | |
| parent | target-ppc: add stxsi[bh]x instruction (diff) | |
| download | qemu-fec5c62a6434bc306906972e276c5a6f2cafdd9a.tar.gz qemu-fec5c62a6434bc306906972e276c5a6f2cafdd9a.tar.xz qemu-fec5c62a6434bc306906972e276c5a6f2cafdd9a.zip | |
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>
Diffstat (limited to 'target-ppc')
| -rw-r--r-- | target-ppc/helper.h | 2 | ||||
| -rw-r--r-- | target-ppc/int_helper.c | 16 | ||||
| -rw-r--r-- | target-ppc/translate.c | 20 |
3 files changed, 38 insertions, 0 deletions
diff --git a/target-ppc/helper.h b/target-ppc/helper.h index e75d0701c0..966f2ce841 100644 --- a/target-ppc/helper.h +++ b/target-ppc/helper.h @@ -50,6 +50,8 @@ DEF_HELPER_FLAGS_1(cnttzd, TCG_CALL_NO_RWG_SE, tl, tl) DEF_HELPER_FLAGS_1(popcntd, TCG_CALL_NO_RWG_SE, tl, tl) DEF_HELPER_FLAGS_2(bpermd, TCG_CALL_NO_RWG_SE, i64, i64, i64) DEF_HELPER_3(srad, tl, env, tl, tl) +DEF_HELPER_0(darn32, tl) +DEF_HELPER_0(darn64, tl) #endif DEF_HELPER_FLAGS_1(cntlsw32, TCG_CALL_NO_RWG_SE, i32, i32) diff --git a/target-ppc/int_helper.c b/target-ppc/int_helper.c index 291fba03f6..51a9ac5182 100644 --- a/target-ppc/int_helper.c +++ b/target-ppc/int_helper.c @@ -182,6 +182,22 @@ target_ulong helper_cnttzd(target_ulong t) { return ctz64(t); } + +/* Return invalid random number. + * + * FIXME: Add rng backend or other mechanism to get cryptographically suitable + * random number + */ +target_ulong helper_darn32(void) +{ + return -1; +} + +target_ulong helper_darn64(void) +{ + return -1; +} + #endif #if defined(TARGET_PPC64) diff --git a/target-ppc/translate.c b/target-ppc/translate.c index e747c1f71c..4f33915bde 100644 --- a/target-ppc/translate.c +++ b/target-ppc/translate.c @@ -528,6 +528,10 @@ EXTRACT_HELPER(FPW, 16, 1); /* addpcis */ EXTRACT_HELPER_DXFORM(DX, 10, 6, 6, 5, 16, 1, 1, 0, 0) +#if defined(TARGET_PPC64) +/* darn */ +EXTRACT_HELPER(L, 16, 2); +#endif /*** Jump target decoding ***/ /* Immediate address */ @@ -1895,6 +1899,21 @@ static void gen_cnttzd(DisasContext *ctx) gen_set_Rc0(ctx, cpu_gpr[rA(ctx->opcode)]); } } + +/* darn */ +static void gen_darn(DisasContext *ctx) +{ + int l = L(ctx->opcode); + + if (l == 0) { + gen_helper_darn32(cpu_gpr[rD(ctx->opcode)]); + } else if (l <= 2) { + /* Return 64-bit random for both CRN and RRN */ + gen_helper_darn64(cpu_gpr[rD(ctx->opcode)]); + } else { + tcg_gen_movi_i64(cpu_gpr[rD(ctx->opcode)], -1); + } +} #endif /*** Integer rotate ***/ @@ -6216,6 +6235,7 @@ GEN_HANDLER_E(prtyw, 0x1F, 0x1A, 0x04, 0x0000F801, PPC_NONE, PPC2_ISA205), GEN_HANDLER(popcntd, 0x1F, 0x1A, 0x0F, 0x0000F801, PPC_POPCNTWD), GEN_HANDLER(cntlzd, 0x1F, 0x1A, 0x01, 0x00000000, PPC_64B), GEN_HANDLER_E(cnttzd, 0x1F, 0x1A, 0x11, 0x00000000, PPC_NONE, PPC2_ISA300), +GEN_HANDLER_E(darn, 0x1F, 0x13, 0x17, 0x001CF801, PPC_NONE, PPC2_ISA300), GEN_HANDLER_E(prtyd, 0x1F, 0x1A, 0x05, 0x0000F801, PPC_NONE, PPC2_ISA205), GEN_HANDLER_E(bpermd, 0x1F, 0x1C, 0x07, 0x00000001, PPC_NONE, PPC2_PERM_ISA206), #endif |