[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v3 12/18] x86emul: add tables for 0f38 and 0f3a extension space
Convert the few existing opcodes so far supported. Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx> --- v3: New. --- a/xen/arch/x86/x86_emulate/x86_emulate.c +++ b/xen/arch/x86/x86_emulate/x86_emulate.c @@ -43,6 +43,8 @@ #define SrcMask (7<<3) /* Generic ModRM decode. */ #define ModRM (1<<6) +/* vSIB addressing mode (0f38 extension opcodes only), aliasing ModRM. */ +#define vSIB (1<<6) /* Destination is only written; never read. */ #define Mov (1<<7) /* VEX/EVEX (SIMD only): 2nd source operand unused (must be all ones) */ @@ -335,6 +337,28 @@ static const struct { [0xff] = { ModRM } }; +static const struct { + uint8_t simd_size:5; + uint8_t to_memory:1; + uint8_t two_op:1; + uint8_t vsib:1; +} ext0f38_table[256] = { + [0x2a] = { .simd_size = simd_packed_int, .two_op = 1 }, + [0xf0] = { .two_op = 1 }, + [0xf1] = { .to_memory = 1, .two_op = 1 }, + [0xf2 ... 0xf3] = {}, + [0xf5 ... 0xf7] = {}, +}; + +static const struct { + uint8_t simd_size:5; + uint8_t to_memory:1; + uint8_t two_op:1; + uint8_t four_op:1; +} ext0f3a_table[256] = { + [0xf0] = {}, +}; + static const opcode_desc_t xop_table[] = { DstReg|SrcImmByte|ModRM, DstReg|SrcMem|ModRM, @@ -2123,7 +2147,7 @@ x86_decode_onebyte( /* fall through */ case 3: /* call (far, absolute indirect) */ case 5: /* jmp (far, absolute indirect) */ - state->desc = DstNone | SrcMem | ModRM | Mov; + state->desc = DstNone | SrcMem | Mov; break; } break; @@ -2193,7 +2217,7 @@ x86_decode_twobyte( if ( vex.pfx == vex_f3 ) /* movq xmm/m64,xmm */ { case X86EMUL_OPC_VEX_F3(0, 0x7e): /* vmovq xmm/m64,xmm */ - state->desc = DstImplicit | SrcMem | ModRM | Mov; + state->desc = DstImplicit | SrcMem | Mov; state->simd_size = simd_other; /* Avoid the state->desc adjustment below. */ return X86EMUL_OKAY; @@ -2207,12 +2231,12 @@ x86_decode_twobyte( switch ( modrm_reg & 7 ) { case 2: /* {,v}ldmxcsr */ - state->desc = DstImplicit | SrcMem | ModRM | Mov; + state->desc = DstImplicit | SrcMem | Mov; op_bytes = 4; break; case 3: /* {,v}stmxcsr */ - state->desc = DstMem | SrcImplicit | ModRM | Mov; + state->desc = DstMem | SrcImplicit | Mov; op_bytes = 4; break; } @@ -2233,7 +2257,7 @@ x86_decode_twobyte( ctxt->opcode |= MASK_INSR(vex.pfx, X86EMUL_OPC_PFX_MASK); /* fall through */ case X86EMUL_OPC_VEX_66(0, 0xc4): /* vpinsrw */ - state->desc = DstReg | SrcMem16 | ModRM; + state->desc = DstReg | SrcMem16; break; } @@ -2269,8 +2293,8 @@ x86_decode_0f38( break; case 0xf1: /* movbe / crc32 */ - if ( !repne_prefix() ) - state->desc = (state->desc & ~(DstMask | SrcMask)) | DstMem | SrcReg | Mov; + if ( repne_prefix() ) + state->desc = DstReg | SrcMem; if ( rep_prefix() ) ctxt->opcode |= MASK_INSR(vex.pfx, X86EMUL_OPC_PFX_MASK); break; @@ -2521,10 +2545,7 @@ x86_decode( opcode |= b | MASK_INSR(vex.pfx, X86EMUL_OPC_PFX_MASK); if ( !(d & ModRM) ) - { - modrm_reg = modrm_rm = modrm_mod = modrm = 0; break; - } modrm = insn_fetch_type(uint8_t); modrm_mod = (modrm & 0xc0) >> 6; @@ -2535,6 +2556,8 @@ x86_decode( if ( d & ModRM ) { + d &= ~ModRM; +#undef ModRM /* Only its aliases are valid to use from here on. */ modrm_reg = ((rex_prefix & 4) << 1) | ((modrm & 0x38) >> 3); modrm_rm = modrm & 0x07; @@ -2544,8 +2567,9 @@ x86_decode( * normally be only addition/removal of SrcImm/SrcImm16, so their * fetching can be taken care of by the common code below. */ - if ( ext == ext_none ) + switch ( ext ) { + case ext_none: switch ( b ) { case 0xf6 ... 0xf7: /* Grp3 */ @@ -2571,6 +2595,25 @@ x86_decode( } break; } + break; + + case vex_0f38: + d = ext0f38_table[b].to_memory ? DstMem | SrcReg + : DstReg | SrcMem; + if ( ext0f38_table[b].two_op ) + d |= TwoOp; + if ( ext0f38_table[b].vsib ) + d |= vSIB; + state->simd_size = ext0f38_table[b].simd_size; + break; + + case vex_0f3a: + /* + * Cannot update d here yet, as the immediate operand still + * needs fetching. + */ + default: + break; } if ( modrm_mod == 3 ) @@ -2581,6 +2624,7 @@ x86_decode( else if ( ad_bytes == 2 ) { /* 16-bit ModR/M decode. */ + generate_exception_if(d & vSIB, EXC_UD); ea.type = OP_MEM; switch ( modrm_rm ) { @@ -2637,7 +2681,7 @@ x86_decode( sib = insn_fetch_type(uint8_t); sib_index = ((sib >> 3) & 7) | ((rex_prefix << 2) & 8); sib_base = (sib & 7) | ((rex_prefix << 3) & 8); - if ( sib_index != 4 ) + if ( sib_index != 4 && !(d & vSIB) ) ea.mem.off = *(long *)decode_register(sib_index, state->regs, 0); ea.mem.off <<= (sib >> 6) & 3; @@ -2663,6 +2707,7 @@ x86_decode( } else { + generate_exception_if(d & vSIB, EXC_UD); modrm_rm |= (rex_prefix & 1) << 3; ea.mem.off = *(long *)decode_register(modrm_rm, state->regs, 0); @@ -2686,6 +2731,11 @@ x86_decode( } } } + else + { + modrm_mod = 0xff; + modrm_reg = modrm_rm = modrm = 0; + } if ( override_seg != x86_seg_none ) ea.mem.seg = override_seg; @@ -2734,6 +2784,13 @@ x86_decode( break; case ext_0f3a: + d = ext0f3a_table[b].to_memory ? DstMem | SrcReg : DstReg | SrcMem; + if ( ext0f3a_table[b].two_op ) + d |= TwoOp; + else if ( ext0f3a_table[b].four_op && !mode_64bit() && vex.opcx ) + imm1 &= 0x7f; + state->desc = d; + state->simd_size = ext0f3a_table[b].simd_size; if ( !vex.opcx ) ctxt->opcode |= MASK_INSR(vex.pfx, X86EMUL_OPC_PFX_MASK); break; @@ -6828,7 +6885,6 @@ x86_emulate( if ( vex.l ) vcpu_must_have(avx2); } - state->simd_size = simd_packed_int; goto movdqa; case X86EMUL_OPC(0x0f38, 0xf0): /* movbe m,r */ @@ -7382,7 +7438,7 @@ x86_insn_modrm(const struct x86_emulate_ { check_state(state); - if ( !(state->desc & ModRM) ) + if ( state->modrm_mod > 3 ) return -EINVAL; if ( rm ) Attachment:
x86emul-0f3x-tables.patch _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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