| /* -*- mode: C; c-basic-offset: 3; -*- */ |
| |
| /*---------------------------------------------------------------*/ |
| /*--- begin host_s390_isel.c ---*/ |
| /*---------------------------------------------------------------*/ |
| |
| /* |
| This file is part of Valgrind, a dynamic binary instrumentation |
| framework. |
| |
| Copyright IBM Corp. 2010-2012 |
| |
| This program is free software; you can redistribute it and/or |
| modify it under the terms of the GNU General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301, USA. |
| |
| The GNU General Public License is contained in the file COPYING. |
| */ |
| |
| /* Contributed by Florian Krohm */ |
| |
| #include "libvex_basictypes.h" |
| #include "libvex_ir.h" |
| #include "libvex.h" |
| #include "libvex_s390x_common.h" |
| |
| #include "main_util.h" |
| #include "main_globals.h" |
| #include "guest_s390_defs.h" /* guest_s390x_state_requires_precise_mem_exns */ |
| #include "host_generic_regs.h" |
| #include "host_s390_defs.h" |
| |
| /*---------------------------------------------------------*/ |
| /*--- ISelEnv ---*/ |
| /*---------------------------------------------------------*/ |
| |
| /* This carries around: |
| |
| - A mapping from IRTemp to IRType, giving the type of any IRTemp we |
| might encounter. This is computed before insn selection starts, |
| and does not change. |
| |
| - A mapping from IRTemp to HReg. This tells the insn selector |
| which virtual register(s) are associated with each IRTemp |
| temporary. This is computed before insn selection starts, and |
| does not change. We expect this mapping to map precisely the |
| same set of IRTemps as the type mapping does. |
| |
| - vregmap holds the primary register for the IRTemp. |
| - vregmapHI holds the secondary register for the IRTemp, |
| if any is needed. That's only for Ity_I64 temps |
| in 32 bit mode or Ity_I128 temps in 64-bit mode. |
| |
| - The code array, that is, the insns selected so far. |
| |
| - A counter, for generating new virtual registers. |
| |
| - The host subarchitecture we are selecting insns for. |
| This is set at the start and does not change. |
| |
| - A Bool for indicating whether we may generate chain-me |
| instructions for control flow transfers, or whether we must use |
| XAssisted. |
| |
| - The maximum guest address of any guest insn in this block. |
| Actually, the address of the highest-addressed byte from any insn |
| in this block. Is set at the start and does not change. This is |
| used for detecting jumps which are definitely forward-edges from |
| this block, and therefore can be made (chained) to the fast entry |
| point of the destination, thereby avoiding the destination's |
| event check. |
| |
| - A flag to indicate whether the guest IA has been assigned to. |
| |
| - Values of certain guest registers which are often assigned constants. |
| */ |
| |
| /* Symbolic names for guest registers whose value we're tracking */ |
| enum { |
| GUEST_IA, |
| GUEST_CC_OP, |
| GUEST_CC_DEP1, |
| GUEST_CC_DEP2, |
| GUEST_CC_NDEP, |
| GUEST_SYSNO, |
| GUEST_COUNTER, |
| GUEST_UNKNOWN /* must be the last entry */ |
| }; |
| |
| /* Number of registers we're tracking. */ |
| #define NUM_TRACKED_REGS GUEST_UNKNOWN |
| |
| |
| typedef struct { |
| IRTypeEnv *type_env; |
| |
| HInstrArray *code; |
| HReg *vregmap; |
| HReg *vregmapHI; |
| UInt n_vregmap; |
| UInt vreg_ctr; |
| UInt hwcaps; |
| |
| ULong old_value[NUM_TRACKED_REGS]; |
| |
| /* The next two are for translation chaining */ |
| Addr64 max_ga; |
| Bool chaining_allowed; |
| |
| Bool first_IA_assignment; |
| Bool old_value_valid[NUM_TRACKED_REGS]; |
| } ISelEnv; |
| |
| |
| /* Forward declarations */ |
| static HReg s390_isel_int_expr(ISelEnv *, IRExpr *); |
| static s390_amode *s390_isel_amode(ISelEnv *, IRExpr *); |
| static s390_cc_t s390_isel_cc(ISelEnv *, IRExpr *); |
| static s390_opnd_RMI s390_isel_int_expr_RMI(ISelEnv *, IRExpr *); |
| static void s390_isel_int128_expr(HReg *, HReg *, ISelEnv *, IRExpr *); |
| static HReg s390_isel_float_expr(ISelEnv *, IRExpr *); |
| static void s390_isel_float128_expr(HReg *, HReg *, ISelEnv *, IRExpr *); |
| |
| |
| static Int |
| get_guest_reg(Int offset) |
| { |
| switch (offset) { |
| case S390X_GUEST_OFFSET(guest_IA): return GUEST_IA; |
| case S390X_GUEST_OFFSET(guest_CC_OP): return GUEST_CC_OP; |
| case S390X_GUEST_OFFSET(guest_CC_DEP1): return GUEST_CC_DEP1; |
| case S390X_GUEST_OFFSET(guest_CC_DEP2): return GUEST_CC_DEP2; |
| case S390X_GUEST_OFFSET(guest_CC_NDEP): return GUEST_CC_NDEP; |
| case S390X_GUEST_OFFSET(guest_SYSNO): return GUEST_SYSNO; |
| case S390X_GUEST_OFFSET(guest_counter): return GUEST_COUNTER; |
| |
| /* Also make sure there is never a partial write to one of |
| these registers. That would complicate matters. */ |
| case S390X_GUEST_OFFSET(guest_IA)+1 ... S390X_GUEST_OFFSET(guest_IA)+7: |
| case S390X_GUEST_OFFSET(guest_CC_OP)+1 ... S390X_GUEST_OFFSET(guest_CC_OP)+7: |
| case S390X_GUEST_OFFSET(guest_CC_DEP1)+1 ... S390X_GUEST_OFFSET(guest_CC_DEP1)+7: |
| case S390X_GUEST_OFFSET(guest_CC_DEP2)+1 ... S390X_GUEST_OFFSET(guest_CC_DEP2)+7: |
| case S390X_GUEST_OFFSET(guest_CC_NDEP)+1 ... S390X_GUEST_OFFSET(guest_CC_NDEP)+7: |
| case S390X_GUEST_OFFSET(guest_SYSNO)+1 ... S390X_GUEST_OFFSET(guest_SYSNO)+7: |
| /* counter is used both as 4-byte and as 8-byte entity */ |
| case S390X_GUEST_OFFSET(guest_counter)+1 ... S390X_GUEST_OFFSET(guest_counter)+3: |
| case S390X_GUEST_OFFSET(guest_counter)+5 ... S390X_GUEST_OFFSET(guest_counter)+7: |
| vpanic("partial update of this guest state register is not allowed"); |
| break; |
| |
| default: break; |
| } |
| |
| return GUEST_UNKNOWN; |
| } |
| |
| /* Add an instruction */ |
| static void |
| addInstr(ISelEnv *env, s390_insn *insn) |
| { |
| addHInstr(env->code, insn); |
| |
| if (vex_traceflags & VEX_TRACE_VCODE) { |
| vex_printf("%s\n", s390_insn_as_string(insn)); |
| } |
| } |
| |
| |
| static __inline__ IRExpr * |
| mkU64(ULong value) |
| { |
| return IRExpr_Const(IRConst_U64(value)); |
| } |
| |
| |
| /*---------------------------------------------------------*/ |
| /*--- Registers ---*/ |
| /*---------------------------------------------------------*/ |
| |
| /* Return the virtual register to which a given IRTemp is mapped. */ |
| static HReg |
| lookupIRTemp(ISelEnv *env, IRTemp tmp) |
| { |
| vassert(tmp < env->n_vregmap); |
| vassert(env->vregmap[tmp] != INVALID_HREG); |
| |
| return env->vregmap[tmp]; |
| } |
| |
| |
| /* Return the two virtual registers to which the IRTemp is mapped. */ |
| static void |
| lookupIRTemp128(HReg *hi, HReg *lo, ISelEnv *env, IRTemp tmp) |
| { |
| vassert(tmp < env->n_vregmap); |
| vassert(env->vregmapHI[tmp] != INVALID_HREG); |
| |
| *lo = env->vregmap[tmp]; |
| *hi = env->vregmapHI[tmp]; |
| } |
| |
| |
| /* Allocate a new integer register */ |
| static HReg |
| newVRegI(ISelEnv *env) |
| { |
| HReg reg = mkHReg(env->vreg_ctr, HRcInt64, True /* virtual */ ); |
| env->vreg_ctr++; |
| |
| return reg; |
| } |
| |
| |
| /* Allocate a new floating point register */ |
| static HReg |
| newVRegF(ISelEnv *env) |
| { |
| HReg reg = mkHReg(env->vreg_ctr, HRcFlt64, True /* virtual */ ); |
| |
| env->vreg_ctr++; |
| |
| return reg; |
| } |
| |
| |
| /* Construct a non-virtual general purpose register */ |
| static __inline__ HReg |
| make_gpr(UInt regno) |
| { |
| return mkHReg(regno, HRcInt64, False /* virtual */ ); |
| } |
| |
| |
| /* Construct a non-virtual floating point register */ |
| static __inline__ HReg |
| make_fpr(UInt regno) |
| { |
| return mkHReg(regno, HRcFlt64, False /* virtual */ ); |
| } |
| |
| |
| /*---------------------------------------------------------*/ |
| /*--- Amode ---*/ |
| /*---------------------------------------------------------*/ |
| |
| static __inline__ Bool |
| ulong_fits_unsigned_12bit(ULong val) |
| { |
| return (val & 0xFFFu) == val; |
| } |
| |
| |
| static __inline__ Bool |
| ulong_fits_signed_20bit(ULong val) |
| { |
| Long v = val & 0xFFFFFu; |
| |
| v = (v << 44) >> 44; /* sign extend */ |
| |
| return val == (ULong)v; |
| } |
| |
| |
| static __inline__ Bool |
| ulong_fits_signed_8bit(ULong val) |
| { |
| Long v = val & 0xFFu; |
| |
| v = (v << 56) >> 56; /* sign extend */ |
| |
| return val == (ULong)v; |
| } |
| |
| /* EXPR is an expression that is used as an address. Return an s390_amode |
| for it. */ |
| static s390_amode * |
| s390_isel_amode_wrk(ISelEnv *env, IRExpr *expr) |
| { |
| if (expr->tag == Iex_Binop && expr->Iex.Binop.op == Iop_Add64) { |
| IRExpr *arg1 = expr->Iex.Binop.arg1; |
| IRExpr *arg2 = expr->Iex.Binop.arg2; |
| |
| /* Move constant into right subtree */ |
| if (arg1->tag == Iex_Const) { |
| IRExpr *tmp; |
| tmp = arg1; |
| arg1 = arg2; |
| arg2 = tmp; |
| } |
| |
| /* r + constant: Check for b12 first, then b20 */ |
| if (arg2->tag == Iex_Const && arg2->Iex.Const.con->tag == Ico_U64) { |
| ULong value = arg2->Iex.Const.con->Ico.U64; |
| |
| if (ulong_fits_unsigned_12bit(value)) { |
| return s390_amode_b12((Int)value, s390_isel_int_expr(env, arg1)); |
| } |
| /* If long-displacement is not available, do not construct B20 or |
| BX20 amodes because code generation cannot handle them. */ |
| if (s390_host_has_ldisp && ulong_fits_signed_20bit(value)) { |
| return s390_amode_b20((Int)value, s390_isel_int_expr(env, arg1)); |
| } |
| } |
| } |
| |
| /* Doesn't match anything in particular. Generate it into |
| a register and use that. */ |
| return s390_amode_b12(0, s390_isel_int_expr(env, expr)); |
| } |
| |
| |
| static s390_amode * |
| s390_isel_amode(ISelEnv *env, IRExpr *expr) |
| { |
| s390_amode *am; |
| |
| /* Address computation should yield a 64-bit value */ |
| vassert(typeOfIRExpr(env->type_env, expr) == Ity_I64); |
| |
| am = s390_isel_amode_wrk(env, expr); |
| |
| /* Check post-condition */ |
| vassert(s390_amode_is_sane(am)); |
| |
| return am; |
| } |
| |
| |
| /*---------------------------------------------------------*/ |
| /*--- Helper functions ---*/ |
| /*---------------------------------------------------------*/ |
| |
| /* Constants and memory accesses should be right operands */ |
| #define order_commutative_operands(left, right) \ |
| do { \ |
| if (left->tag == Iex_Const || left->tag == Iex_Load || \ |
| left->tag == Iex_Get) { \ |
| IRExpr *tmp; \ |
| tmp = left; \ |
| left = right; \ |
| right = tmp; \ |
| } \ |
| } while (0) |
| |
| |
| /* Copy an RMI operand to the DST register */ |
| static s390_insn * |
| s390_opnd_copy(UChar size, HReg dst, s390_opnd_RMI opnd) |
| { |
| switch (opnd.tag) { |
| case S390_OPND_AMODE: |
| return s390_insn_load(size, dst, opnd.variant.am); |
| |
| case S390_OPND_REG: |
| return s390_insn_move(size, dst, opnd.variant.reg); |
| |
| case S390_OPND_IMMEDIATE: |
| return s390_insn_load_immediate(size, dst, opnd.variant.imm); |
| |
| default: |
| vpanic("s390_opnd_copy"); |
| } |
| } |
| |
| |
| /* Construct a RMI operand for a register */ |
| static __inline__ s390_opnd_RMI |
| s390_opnd_reg(HReg reg) |
| { |
| s390_opnd_RMI opnd; |
| |
| opnd.tag = S390_OPND_REG; |
| opnd.variant.reg = reg; |
| |
| return opnd; |
| } |
| |
| |
| /* Construct a RMI operand for an immediate constant */ |
| static __inline__ s390_opnd_RMI |
| s390_opnd_imm(ULong value) |
| { |
| s390_opnd_RMI opnd; |
| |
| opnd.tag = S390_OPND_IMMEDIATE; |
| opnd.variant.imm = value; |
| |
| return opnd; |
| } |
| |
| |
| /* Return 1, if EXPR represents the cosntant 0 */ |
| static int |
| s390_expr_is_const_zero(IRExpr *expr) |
| { |
| ULong value; |
| |
| if (expr->tag == Iex_Const) { |
| switch (expr->Iex.Const.con->tag) { |
| case Ico_U1: value = expr->Iex.Const.con->Ico.U1; break; |
| case Ico_U8: value = expr->Iex.Const.con->Ico.U8; break; |
| case Ico_U16: value = expr->Iex.Const.con->Ico.U16; break; |
| case Ico_U32: value = expr->Iex.Const.con->Ico.U32; break; |
| case Ico_U64: value = expr->Iex.Const.con->Ico.U64; break; |
| default: |
| vpanic("s390_expr_is_const_zero"); |
| } |
| return value == 0; |
| } |
| |
| return 0; |
| } |
| |
| |
| /* Call a helper (clean or dirty) |
| Arguments must satisfy the following conditions: |
| |
| (a) they are expressions yielding an integer result |
| (b) there can be no more than S390_NUM_GPRPARMS arguments |
| |
| guard is a Ity_Bit expression indicating whether or not the |
| call happens. If guard == NULL, the call is unconditional. |
| |
| Calling the helper function proceeds as follows: |
| |
| (1) The helper arguments are evaluated and their value stored in |
| virtual registers. |
| (2) The condition code is evaluated |
| (3) The argument values are copied from the virtual registers to the |
| registers mandated by the ABI. |
| (4) Call the helper function. |
| |
| This is not the most efficient way as step 3 generates register-to-register |
| moves. But it is the least fragile way as the only hidden dependency here |
| is that register-to-register moves (step 3) must not clobber the condition |
| code. Other schemes (e.g. VEX r2326) that attempt to avoid the register- |
| to-register add more such dependencies. Not good. Besides, it's the job |
| of the register allocator to throw out those reg-to-reg moves. |
| */ |
| static void |
| doHelperCall(ISelEnv *env, Bool passBBP, IRExpr *guard, |
| IRCallee *callee, IRExpr **args, HReg dst) |
| { |
| UInt n_args, i, argreg, size; |
| ULong target; |
| HReg tmpregs[S390_NUM_GPRPARMS]; |
| s390_cc_t cc; |
| |
| n_args = 0; |
| for (i = 0; args[i]; i++) |
| ++n_args; |
| |
| if (n_args > (S390_NUM_GPRPARMS - (passBBP ? 1 : 0))) { |
| vpanic("doHelperCall: too many arguments"); |
| } |
| |
| /* All arguments must have Ity_I64. For two reasons: |
| (1) We do not handle floating point arguments. |
| (2) The ABI requires that integer values are sign- or zero-extended |
| to 64 bit. |
| */ |
| Int arg_errors = 0; |
| for (i = 0; i < n_args; ++i) { |
| IRType type = typeOfIRExpr(env->type_env, args[i]); |
| if (type != Ity_I64) { |
| ++arg_errors; |
| vex_printf("calling %s: argument #%d has type ", callee->name, i); |
| ppIRType(type); |
| vex_printf("; Ity_I64 is required\n"); |
| } |
| } |
| |
| if (arg_errors) |
| vpanic("cannot continue due to errors in argument passing"); |
| |
| argreg = 0; |
| |
| /* If we need the guest state pointer put it in a temporary arg reg */ |
| if (passBBP) { |
| tmpregs[argreg] = newVRegI(env); |
| addInstr(env, s390_insn_move(sizeof(ULong), tmpregs[argreg], |
| s390_hreg_guest_state_pointer())); |
| argreg++; |
| } |
| |
| /* Compute the function arguments into a temporary register each */ |
| for (i = 0; i < n_args; i++) { |
| tmpregs[argreg] = s390_isel_int_expr(env, args[i]); |
| argreg++; |
| } |
| |
| /* Compute the condition */ |
| cc = S390_CC_ALWAYS; |
| if (guard) { |
| if (guard->tag == Iex_Const |
| && guard->Iex.Const.con->tag == Ico_U1 |
| && guard->Iex.Const.con->Ico.U1 == True) { |
| /* unconditional -- do nothing */ |
| } else { |
| cc = s390_isel_cc(env, guard); |
| } |
| } |
| |
| /* Move the args to the final register. It is paramount, that the |
| code to move the registers does not clobber the condition code ! */ |
| for (i = 0; i < argreg; i++) { |
| HReg finalreg; |
| |
| finalreg = make_gpr(s390_gprno_from_arg_index(i)); |
| size = sizeofIRType(Ity_I64); |
| addInstr(env, s390_insn_move(size, finalreg, tmpregs[i])); |
| } |
| |
| target = Ptr_to_ULong(callee->addr); |
| |
| /* Finally, the call itself. */ |
| addInstr(env, s390_insn_helper_call(cc, (Addr64)target, n_args, |
| callee->name, dst)); |
| } |
| |
| |
| /* Given an expression representing a rounding mode using IRRoundingMode |
| encoding convert it to an s390_round_t value. */ |
| static s390_round_t |
| decode_rounding_mode(IRExpr *rounding_expr) |
| { |
| if (rounding_expr->tag == Iex_Const && |
| rounding_expr->Iex.Const.con->tag == Ico_U32) { |
| IRRoundingMode mode = rounding_expr->Iex.Const.con->Ico.U32; |
| |
| switch (mode) { |
| case Irrm_NEAREST: return S390_ROUND_NEAREST_EVEN; |
| case Irrm_ZERO: return S390_ROUND_ZERO; |
| case Irrm_PosINF: return S390_ROUND_POSINF; |
| case Irrm_NegINF: return S390_ROUND_NEGINF; |
| } |
| } |
| |
| vpanic("decode_rounding_mode"); |
| } |
| |
| |
| /* CC_S390 holds the condition code in s390 encoding. Convert it to |
| VEX encoding |
| |
| s390 VEX b6 b2 b0 cc.1 cc.0 |
| 0 0x40 EQ 1 0 0 0 0 |
| 1 0x01 LT 0 0 1 0 1 |
| 2 0x00 GT 0 0 0 1 0 |
| 3 0x45 Unordered 1 1 1 1 1 |
| |
| b0 = cc.0 |
| b2 = cc.0 & cc.1 |
| b6 = ~(cc.0 ^ cc.1) // ((cc.0 - cc.1) + 0x1 ) & 0x1 |
| |
| VEX = b0 | (b2 << 2) | (b6 << 6); |
| */ |
| static HReg |
| convert_s390_fpcc_to_vex(ISelEnv *env, HReg cc_s390) |
| { |
| HReg cc0, cc1, b2, b6, cc_vex; |
| |
| cc0 = newVRegI(env); |
| addInstr(env, s390_insn_move(4, cc0, cc_s390)); |
| addInstr(env, s390_insn_alu(4, S390_ALU_AND, cc0, s390_opnd_imm(1))); |
| |
| cc1 = newVRegI(env); |
| addInstr(env, s390_insn_move(4, cc1, cc_s390)); |
| addInstr(env, s390_insn_alu(4, S390_ALU_RSH, cc1, s390_opnd_imm(1))); |
| |
| b2 = newVRegI(env); |
| addInstr(env, s390_insn_move(4, b2, cc0)); |
| addInstr(env, s390_insn_alu(4, S390_ALU_AND, b2, s390_opnd_reg(cc1))); |
| addInstr(env, s390_insn_alu(4, S390_ALU_LSH, b2, s390_opnd_imm(2))); |
| |
| b6 = newVRegI(env); |
| addInstr(env, s390_insn_move(4, b6, cc0)); |
| addInstr(env, s390_insn_alu(4, S390_ALU_SUB, b6, s390_opnd_reg(cc1))); |
| addInstr(env, s390_insn_alu(4, S390_ALU_ADD, b6, s390_opnd_imm(1))); |
| addInstr(env, s390_insn_alu(4, S390_ALU_AND, b6, s390_opnd_imm(1))); |
| addInstr(env, s390_insn_alu(4, S390_ALU_LSH, b6, s390_opnd_imm(6))); |
| |
| cc_vex = newVRegI(env); |
| addInstr(env, s390_insn_move(4, cc_vex, cc0)); |
| addInstr(env, s390_insn_alu(4, S390_ALU_OR, cc_vex, s390_opnd_reg(b2))); |
| addInstr(env, s390_insn_alu(4, S390_ALU_OR, cc_vex, s390_opnd_reg(b6))); |
| |
| return cc_vex; |
| } |
| |
| |
| /*---------------------------------------------------------*/ |
| /*--- ISEL: Integer expressions (128 bit) ---*/ |
| /*---------------------------------------------------------*/ |
| static void |
| s390_isel_int128_expr_wrk(HReg *dst_hi, HReg *dst_lo, ISelEnv *env, |
| IRExpr *expr) |
| { |
| IRType ty = typeOfIRExpr(env->type_env, expr); |
| |
| vassert(ty == Ity_I128); |
| |
| /* No need to consider the following |
| - 128-bit constants (they do not exist in VEX) |
| - 128-bit loads from memory (will not be generated) |
| */ |
| |
| /* Read 128-bit IRTemp */ |
| if (expr->tag == Iex_RdTmp) { |
| lookupIRTemp128(dst_hi, dst_lo, env, expr->Iex.RdTmp.tmp); |
| return; |
| } |
| |
| if (expr->tag == Iex_Binop) { |
| IRExpr *arg1 = expr->Iex.Binop.arg1; |
| IRExpr *arg2 = expr->Iex.Binop.arg2; |
| Bool is_signed_multiply, is_signed_divide; |
| |
| switch (expr->Iex.Binop.op) { |
| case Iop_MullU64: |
| is_signed_multiply = False; |
| goto do_multiply64; |
| |
| case Iop_MullS64: |
| is_signed_multiply = True; |
| goto do_multiply64; |
| |
| case Iop_DivModU128to64: |
| is_signed_divide = False; |
| goto do_divide64; |
| |
| case Iop_DivModS128to64: |
| is_signed_divide = True; |
| goto do_divide64; |
| |
| case Iop_64HLto128: |
| *dst_hi = s390_isel_int_expr(env, arg1); |
| *dst_lo = s390_isel_int_expr(env, arg2); |
| return; |
| |
| case Iop_DivModS64to64: { |
| HReg r10, r11, h1; |
| s390_opnd_RMI op2; |
| |
| h1 = s390_isel_int_expr(env, arg1); /* Process 1st operand */ |
| op2 = s390_isel_int_expr_RMI(env, arg2); /* Process 2nd operand */ |
| |
| /* We use non-virtual registers r10 and r11 as pair */ |
| r10 = make_gpr(10); |
| r11 = make_gpr(11); |
| |
| /* Move 1st operand into r11 and */ |
| addInstr(env, s390_insn_move(8, r11, h1)); |
| |
| /* Divide */ |
| addInstr(env, s390_insn_divs(8, r10, r11, op2)); |
| |
| /* The result is in registers r10 (remainder) and r11 (quotient). |
| Move the result into the reg pair that is being returned such |
| such that the low 64 bits are the quotient and the upper 64 bits |
| are the remainder. (see libvex_ir.h). */ |
| *dst_hi = newVRegI(env); |
| *dst_lo = newVRegI(env); |
| addInstr(env, s390_insn_move(8, *dst_hi, r10)); |
| addInstr(env, s390_insn_move(8, *dst_lo, r11)); |
| return; |
| } |
| |
| default: |
| break; |
| |
| do_multiply64: { |
| HReg r10, r11, h1; |
| s390_opnd_RMI op2; |
| |
| order_commutative_operands(arg1, arg2); |
| |
| h1 = s390_isel_int_expr(env, arg1); /* Process 1st operand */ |
| op2 = s390_isel_int_expr_RMI(env, arg2); /* Process 2nd operand */ |
| |
| /* We use non-virtual registers r10 and r11 as pair */ |
| r10 = make_gpr(10); |
| r11 = make_gpr(11); |
| |
| /* Move the first operand to r11 */ |
| addInstr(env, s390_insn_move(8, r11, h1)); |
| |
| /* Multiply */ |
| addInstr(env, s390_insn_mul(8, r10, r11, op2, is_signed_multiply)); |
| |
| /* The result is in registers r10 and r11. Assign to two virtual regs |
| and return. */ |
| *dst_hi = newVRegI(env); |
| *dst_lo = newVRegI(env); |
| addInstr(env, s390_insn_move(8, *dst_hi, r10)); |
| addInstr(env, s390_insn_move(8, *dst_lo, r11)); |
| return; |
| } |
| |
| do_divide64: { |
| HReg r10, r11, hi, lo; |
| s390_opnd_RMI op2; |
| |
| s390_isel_int128_expr(&hi, &lo, env, arg1); |
| op2 = s390_isel_int_expr_RMI(env, arg2); /* Process 2nd operand */ |
| |
| /* We use non-virtual registers r10 and r11 as pair */ |
| r10 = make_gpr(10); |
| r11 = make_gpr(11); |
| |
| /* Move high 64 bits of the 1st operand into r10 and |
| the low 64 bits into r11. */ |
| addInstr(env, s390_insn_move(8, r10, hi)); |
| addInstr(env, s390_insn_move(8, r11, lo)); |
| |
| /* Divide */ |
| addInstr(env, s390_insn_div(8, r10, r11, op2, is_signed_divide)); |
| |
| /* The result is in registers r10 (remainder) and r11 (quotient). |
| Move the result into the reg pair that is being returned such |
| such that the low 64 bits are the quotient and the upper 64 bits |
| are the remainder. (see libvex_ir.h). */ |
| *dst_hi = newVRegI(env); |
| *dst_lo = newVRegI(env); |
| addInstr(env, s390_insn_move(8, *dst_hi, r10)); |
| addInstr(env, s390_insn_move(8, *dst_lo, r11)); |
| return; |
| } |
| } |
| } |
| |
| vpanic("s390_isel_int128_expr"); |
| } |
| |
| |
| /* Compute a 128-bit value into two 64-bit registers. These may be either |
| real or virtual regs; in any case they must not be changed by subsequent |
| code emitted by the caller. */ |
| static void |
| s390_isel_int128_expr(HReg *dst_hi, HReg *dst_lo, ISelEnv *env, IRExpr *expr) |
| { |
| s390_isel_int128_expr_wrk(dst_hi, dst_lo, env, expr); |
| |
| /* Sanity checks ... */ |
| vassert(hregIsVirtual(*dst_hi)); |
| vassert(hregIsVirtual(*dst_lo)); |
| vassert(hregClass(*dst_hi) == HRcInt64); |
| vassert(hregClass(*dst_lo) == HRcInt64); |
| } |
| |
| |
| /*---------------------------------------------------------*/ |
| /*--- ISEL: Integer expressions (64/32/16/8 bit) ---*/ |
| /*---------------------------------------------------------*/ |
| |
| /* Select insns for an integer-typed expression, and add them to the |
| code list. Return a reg holding the result. This reg will be a |
| virtual register. THE RETURNED REG MUST NOT BE MODIFIED. If you |
| want to modify it, ask for a new vreg, copy it in there, and modify |
| the copy. The register allocator will do its best to map both |
| vregs to the same real register, so the copies will often disappear |
| later in the game. |
| |
| This should handle expressions of 64, 32, 16 and 8-bit type. |
| All results are returned in a 64bit register. |
| For 16- and 8-bit expressions, the upper (32/48/56 : 16/24) bits |
| are arbitrary, so you should mask or sign extend partial values |
| if necessary. |
| */ |
| |
| /* DO NOT CALL THIS DIRECTLY ! */ |
| static HReg |
| s390_isel_int_expr_wrk(ISelEnv *env, IRExpr *expr) |
| { |
| IRType ty = typeOfIRExpr(env->type_env, expr); |
| UChar size; |
| s390_conv_t conv; |
| |
| vassert(ty == Ity_I8 || ty == Ity_I16 || ty == Ity_I32 || ty == Ity_I64); |
| |
| size = sizeofIRType(ty); /* size of the result after evaluating EXPR */ |
| |
| switch (expr->tag) { |
| |
| /* --------- TEMP --------- */ |
| case Iex_RdTmp: |
| /* Return the virtual register that holds the temporary. */ |
| return lookupIRTemp(env, expr->Iex.RdTmp.tmp); |
| |
| /* --------- LOAD --------- */ |
| case Iex_Load: { |
| HReg dst = newVRegI(env); |
| s390_amode *am = s390_isel_amode(env, expr->Iex.Load.addr); |
| |
| if (expr->Iex.Load.end != Iend_BE) |
| goto irreducible; |
| |
| addInstr(env, s390_insn_load(size, dst, am)); |
| |
| return dst; |
| } |
| |
| /* --------- BINARY OP --------- */ |
| case Iex_Binop: { |
| IRExpr *arg1 = expr->Iex.Binop.arg1; |
| IRExpr *arg2 = expr->Iex.Binop.arg2; |
| HReg h1, res; |
| s390_alu_t opkind; |
| s390_opnd_RMI op2, value, opnd; |
| s390_insn *insn; |
| Bool is_commutative, is_signed_multiply, is_signed_divide; |
| |
| is_commutative = True; |
| |
| switch (expr->Iex.Binop.op) { |
| case Iop_MullU8: |
| case Iop_MullU16: |
| case Iop_MullU32: |
| is_signed_multiply = False; |
| goto do_multiply; |
| |
| case Iop_MullS8: |
| case Iop_MullS16: |
| case Iop_MullS32: |
| is_signed_multiply = True; |
| goto do_multiply; |
| |
| do_multiply: { |
| HReg r10, r11; |
| UInt arg_size = size / 2; |
| |
| order_commutative_operands(arg1, arg2); |
| |
| h1 = s390_isel_int_expr(env, arg1); /* Process 1st operand */ |
| op2 = s390_isel_int_expr_RMI(env, arg2); /* Process 2nd operand */ |
| |
| /* We use non-virtual registers r10 and r11 as pair */ |
| r10 = make_gpr(10); |
| r11 = make_gpr(11); |
| |
| /* Move the first operand to r11 */ |
| addInstr(env, s390_insn_move(arg_size, r11, h1)); |
| |
| /* Multiply */ |
| addInstr(env, s390_insn_mul(arg_size, r10, r11, op2, is_signed_multiply)); |
| |
| /* The result is in registers r10 and r11. Combine them into a SIZE-bit |
| value into the destination register. */ |
| res = newVRegI(env); |
| addInstr(env, s390_insn_move(arg_size, res, r10)); |
| value = s390_opnd_imm(arg_size * 8); |
| addInstr(env, s390_insn_alu(size, S390_ALU_LSH, res, value)); |
| value = s390_opnd_imm((((ULong)1) << arg_size * 8) - 1); |
| addInstr(env, s390_insn_alu(size, S390_ALU_AND, r11, value)); |
| opnd = s390_opnd_reg(r11); |
| addInstr(env, s390_insn_alu(size, S390_ALU_OR, res, opnd)); |
| return res; |
| } |
| |
| case Iop_DivModS64to32: |
| is_signed_divide = True; |
| goto do_divide; |
| |
| case Iop_DivModU64to32: |
| is_signed_divide = False; |
| goto do_divide; |
| |
| do_divide: { |
| HReg r10, r11; |
| |
| h1 = s390_isel_int_expr(env, arg1); /* Process 1st operand */ |
| op2 = s390_isel_int_expr_RMI(env, arg2); /* Process 2nd operand */ |
| |
| /* We use non-virtual registers r10 and r11 as pair */ |
| r10 = make_gpr(10); |
| r11 = make_gpr(11); |
| |
| /* Split the first operand and put the high 32 bits into r10 and |
| the low 32 bits into r11. */ |
| addInstr(env, s390_insn_move(8, r10, h1)); |
| addInstr(env, s390_insn_move(8, r11, h1)); |
| value = s390_opnd_imm(32); |
| addInstr(env, s390_insn_alu(8, S390_ALU_RSH, r10, value)); |
| |
| /* Divide */ |
| addInstr(env, s390_insn_div(4, r10, r11, op2, is_signed_divide)); |
| |
| /* The result is in registers r10 (remainder) and r11 (quotient). |
| Combine them into a 64-bit value such that the low 32 bits are |
| the quotient and the upper 32 bits are the remainder. (see |
| libvex_ir.h). */ |
| res = newVRegI(env); |
| addInstr(env, s390_insn_move(8, res, r10)); |
| value = s390_opnd_imm(32); |
| addInstr(env, s390_insn_alu(8, S390_ALU_LSH, res, value)); |
| value = s390_opnd_imm((((ULong)1) << 32) - 1); |
| addInstr(env, s390_insn_alu(8, S390_ALU_AND, r11, value)); |
| opnd = s390_opnd_reg(r11); |
| addInstr(env, s390_insn_alu(8, S390_ALU_OR, res, opnd)); |
| return res; |
| } |
| |
| case Iop_F32toI32S: conv = S390_BFP_F32_TO_I32; goto do_convert; |
| case Iop_F32toI64S: conv = S390_BFP_F32_TO_I64; goto do_convert; |
| case Iop_F32toI32U: conv = S390_BFP_F32_TO_U32; goto do_convert; |
| case Iop_F32toI64U: conv = S390_BFP_F32_TO_U64; goto do_convert; |
| case Iop_F64toI32S: conv = S390_BFP_F64_TO_I32; goto do_convert; |
| case Iop_F64toI64S: conv = S390_BFP_F64_TO_I64; goto do_convert; |
| case Iop_F64toI32U: conv = S390_BFP_F64_TO_U32; goto do_convert; |
| case Iop_F64toI64U: conv = S390_BFP_F64_TO_U64; goto do_convert; |
| case Iop_F128toI32S: conv = S390_BFP_F128_TO_I32; goto do_convert_128; |
| case Iop_F128toI64S: conv = S390_BFP_F128_TO_I64; goto do_convert_128; |
| case Iop_F128toI32U: conv = S390_BFP_F128_TO_U32; goto do_convert_128; |
| case Iop_F128toI64U: conv = S390_BFP_F128_TO_U64; goto do_convert_128; |
| |
| do_convert: { |
| s390_round_t rounding_mode; |
| |
| res = newVRegI(env); |
| h1 = s390_isel_float_expr(env, arg2); /* Process operand */ |
| |
| rounding_mode = decode_rounding_mode(arg1); |
| addInstr(env, s390_insn_bfp_convert(size, conv, res, h1, rounding_mode)); |
| return res; |
| } |
| |
| do_convert_128: { |
| s390_round_t rounding_mode; |
| HReg op_hi, op_lo, f13, f15; |
| |
| res = newVRegI(env); |
| s390_isel_float128_expr(&op_hi, &op_lo, env, arg2); /* operand */ |
| |
| /* We use non-virtual registers r13 and r15 as pair */ |
| f13 = make_fpr(13); |
| f15 = make_fpr(15); |
| |
| /* operand --> (f13, f15) */ |
| addInstr(env, s390_insn_move(8, f13, op_hi)); |
| addInstr(env, s390_insn_move(8, f15, op_lo)); |
| |
| rounding_mode = decode_rounding_mode(arg1); |
| addInstr(env, s390_insn_bfp128_convert_from(size, conv, res, f13, f15, |
| rounding_mode)); |
| return res; |
| } |
| |
| case Iop_8HLto16: |
| case Iop_16HLto32: |
| case Iop_32HLto64: { |
| HReg h2; |
| UInt arg_size = size / 2; |
| |
| res = newVRegI(env); |
| h1 = s390_isel_int_expr(env, arg1); /* Process 1st operand */ |
| h2 = s390_isel_int_expr(env, arg2); /* Process 2nd operand */ |
| |
| addInstr(env, s390_insn_move(arg_size, res, h1)); |
| value = s390_opnd_imm(arg_size * 8); |
| addInstr(env, s390_insn_alu(size, S390_ALU_LSH, res, value)); |
| value = s390_opnd_imm((((ULong)1) << arg_size * 8) - 1); |
| addInstr(env, s390_insn_alu(size, S390_ALU_AND, h2, value)); |
| opnd = s390_opnd_reg(h2); |
| addInstr(env, s390_insn_alu(size, S390_ALU_OR, res, opnd)); |
| return res; |
| } |
| |
| case Iop_Max32U: { |
| /* arg1 > arg2 ? arg1 : arg2 using uint32_t arguments */ |
| res = newVRegI(env); |
| h1 = s390_isel_int_expr(env, arg1); |
| op2 = s390_isel_int_expr_RMI(env, arg2); |
| |
| addInstr(env, s390_insn_move(size, res, h1)); |
| addInstr(env, s390_insn_compare(size, res, op2, False /* signed */)); |
| addInstr(env, s390_insn_cond_move(size, S390_CC_L, res, op2)); |
| return res; |
| } |
| |
| case Iop_CmpF32: |
| case Iop_CmpF64: { |
| HReg cc_s390, h2; |
| |
| h1 = s390_isel_float_expr(env, arg1); |
| h2 = s390_isel_float_expr(env, arg2); |
| cc_s390 = newVRegI(env); |
| |
| size = (expr->Iex.Binop.op == Iop_CmpF32) ? 4 : 8; |
| |
| addInstr(env, s390_insn_bfp_compare(size, cc_s390, h1, h2)); |
| |
| return convert_s390_fpcc_to_vex(env, cc_s390); |
| } |
| |
| case Iop_CmpF128: { |
| HReg op1_hi, op1_lo, op2_hi, op2_lo, f12, f13, f14, f15, cc_s390; |
| |
| s390_isel_float128_expr(&op1_hi, &op1_lo, env, arg1); /* 1st operand */ |
| s390_isel_float128_expr(&op2_hi, &op2_lo, env, arg2); /* 2nd operand */ |
| cc_s390 = newVRegI(env); |
| |
| /* We use non-virtual registers as pairs (f13, f15) and (f12, f14)) */ |
| f12 = make_fpr(12); |
| f13 = make_fpr(13); |
| f14 = make_fpr(14); |
| f15 = make_fpr(15); |
| |
| /* 1st operand --> (f12, f14) */ |
| addInstr(env, s390_insn_move(8, f12, op1_hi)); |
| addInstr(env, s390_insn_move(8, f14, op1_lo)); |
| |
| /* 2nd operand --> (f13, f15) */ |
| addInstr(env, s390_insn_move(8, f13, op2_hi)); |
| addInstr(env, s390_insn_move(8, f15, op2_lo)); |
| |
| res = newVRegI(env); |
| addInstr(env, s390_insn_bfp128_compare(16, cc_s390, f12, f14, f13, f15)); |
| |
| return convert_s390_fpcc_to_vex(env, cc_s390); |
| } |
| |
| case Iop_Add8: |
| case Iop_Add16: |
| case Iop_Add32: |
| case Iop_Add64: |
| opkind = S390_ALU_ADD; |
| break; |
| |
| case Iop_Sub8: |
| case Iop_Sub16: |
| case Iop_Sub32: |
| case Iop_Sub64: |
| opkind = S390_ALU_SUB; |
| is_commutative = False; |
| break; |
| |
| case Iop_And8: |
| case Iop_And16: |
| case Iop_And32: |
| case Iop_And64: |
| opkind = S390_ALU_AND; |
| break; |
| |
| case Iop_Or8: |
| case Iop_Or16: |
| case Iop_Or32: |
| case Iop_Or64: |
| opkind = S390_ALU_OR; |
| break; |
| |
| case Iop_Xor8: |
| case Iop_Xor16: |
| case Iop_Xor32: |
| case Iop_Xor64: |
| opkind = S390_ALU_XOR; |
| break; |
| |
| case Iop_Shl8: |
| case Iop_Shl16: |
| case Iop_Shl32: |
| case Iop_Shl64: |
| opkind = S390_ALU_LSH; |
| is_commutative = False; |
| break; |
| |
| case Iop_Shr8: |
| case Iop_Shr16: |
| case Iop_Shr32: |
| case Iop_Shr64: |
| opkind = S390_ALU_RSH; |
| is_commutative = False; |
| break; |
| |
| case Iop_Sar8: |
| case Iop_Sar16: |
| case Iop_Sar32: |
| case Iop_Sar64: |
| opkind = S390_ALU_RSHA; |
| is_commutative = False; |
| break; |
| |
| default: |
| goto irreducible; |
| } |
| |
| /* Pattern match: 0 - arg1 --> -arg1 */ |
| if (opkind == S390_ALU_SUB && s390_expr_is_const_zero(arg1)) { |
| res = newVRegI(env); |
| op2 = s390_isel_int_expr_RMI(env, arg2); /* Process 2nd operand */ |
| insn = s390_insn_unop(size, S390_NEGATE, res, op2); |
| addInstr(env, insn); |
| |
| return res; |
| } |
| |
| if (is_commutative) { |
| order_commutative_operands(arg1, arg2); |
| } |
| |
| h1 = s390_isel_int_expr(env, arg1); /* Process 1st operand */ |
| op2 = s390_isel_int_expr_RMI(env, arg2); /* Process 2nd operand */ |
| res = newVRegI(env); |
| |
| /* As right shifts of one/two byte opreands are implemented using a |
| 4-byte shift op, we first need to zero/sign-extend the shiftee. */ |
| switch (expr->Iex.Binop.op) { |
| case Iop_Shr8: |
| insn = s390_insn_unop(4, S390_ZERO_EXTEND_8, res, s390_opnd_reg(h1)); |
| break; |
| case Iop_Shr16: |
| insn = s390_insn_unop(4, S390_ZERO_EXTEND_16, res, s390_opnd_reg(h1)); |
| break; |
| case Iop_Sar8: |
| insn = s390_insn_unop(4, S390_SIGN_EXTEND_8, res, s390_opnd_reg(h1)); |
| break; |
| case Iop_Sar16: |
| insn = s390_insn_unop(4, S390_SIGN_EXTEND_16, res, s390_opnd_reg(h1)); |
| break; |
| default: |
| insn = s390_insn_move(size, res, h1); |
| break; |
| } |
| addInstr(env, insn); |
| |
| insn = s390_insn_alu(size, opkind, res, op2); |
| |
| addInstr(env, insn); |
| |
| return res; |
| } |
| |
| /* --------- UNARY OP --------- */ |
| case Iex_Unop: { |
| static s390_opnd_RMI mask = { S390_OPND_IMMEDIATE }; |
| static s390_opnd_RMI shift = { S390_OPND_IMMEDIATE }; |
| s390_opnd_RMI opnd; |
| s390_insn *insn; |
| IRExpr *arg; |
| HReg dst, h1; |
| IROp unop, binop; |
| |
| arg = expr->Iex.Unop.arg; |
| |
| /* Special cases are handled here */ |
| |
| /* 32-bit multiply with 32-bit result or |
| 64-bit multiply with 64-bit result */ |
| unop = expr->Iex.Unop.op; |
| binop = arg->Iex.Binop.op; |
| |
| if ((arg->tag == Iex_Binop && |
| ((unop == Iop_64to32 && |
| (binop == Iop_MullS32 || binop == Iop_MullU32)) || |
| (unop == Iop_128to64 && |
| (binop == Iop_MullS64 || binop == Iop_MullU64))))) { |
| h1 = s390_isel_int_expr(env, arg->Iex.Binop.arg1); /* 1st opnd */ |
| opnd = s390_isel_int_expr_RMI(env, arg->Iex.Binop.arg2); /* 2nd opnd */ |
| dst = newVRegI(env); /* Result goes into a new register */ |
| addInstr(env, s390_insn_move(size, dst, h1)); |
| addInstr(env, s390_insn_alu(size, S390_ALU_MUL, dst, opnd)); |
| |
| return dst; |
| } |
| |
| if (unop == Iop_ReinterpF64asI64 || unop == Iop_ReinterpF32asI32) { |
| dst = newVRegI(env); |
| h1 = s390_isel_float_expr(env, arg); /* Process the operand */ |
| addInstr(env, s390_insn_move(size, dst, h1)); |
| |
| return dst; |
| } |
| |
| /* Expressions whose argument is 1-bit wide */ |
| if (typeOfIRExpr(env->type_env, arg) == Ity_I1) { |
| s390_cc_t cond = s390_isel_cc(env, arg); |
| dst = newVRegI(env); /* Result goes into a new register */ |
| addInstr(env, s390_insn_cc2bool(dst, cond)); |
| |
| switch (unop) { |
| case Iop_1Uto8: |
| case Iop_1Uto32: |
| /* Zero extend */ |
| mask.variant.imm = 1; |
| addInstr(env, s390_insn_alu(4, S390_ALU_AND, dst, mask)); |
| break; |
| |
| case Iop_1Uto64: |
| /* Zero extend */ |
| mask.variant.imm = 1; |
| addInstr(env, s390_insn_alu(8, S390_ALU_AND, dst, mask)); |
| break; |
| |
| case Iop_1Sto8: |
| case Iop_1Sto16: |
| case Iop_1Sto32: |
| shift.variant.imm = 31; |
| addInstr(env, s390_insn_alu(4, S390_ALU_LSH, dst, shift)); |
| addInstr(env, s390_insn_alu(4, S390_ALU_RSHA, dst, shift)); |
| break; |
| |
| case Iop_1Sto64: |
| shift.variant.imm = 63; |
| addInstr(env, s390_insn_alu(8, S390_ALU_LSH, dst, shift)); |
| addInstr(env, s390_insn_alu(8, S390_ALU_RSHA, dst, shift)); |
| break; |
| |
| default: |
| goto irreducible; |
| } |
| |
| return dst; |
| } |
| |
| /* Regular processing */ |
| |
| if (unop == Iop_128to64) { |
| HReg dst_hi, dst_lo; |
| |
| s390_isel_int128_expr(&dst_hi, &dst_lo, env, arg); |
| return dst_lo; |
| } |
| |
| if (unop == Iop_128HIto64) { |
| HReg dst_hi, dst_lo; |
| |
| s390_isel_int128_expr(&dst_hi, &dst_lo, env, arg); |
| return dst_hi; |
| } |
| |
| dst = newVRegI(env); /* Result goes into a new register */ |
| opnd = s390_isel_int_expr_RMI(env, arg); /* Process the operand */ |
| |
| switch (unop) { |
| case Iop_8Uto16: |
| case Iop_8Uto32: |
| case Iop_8Uto64: |
| insn = s390_insn_unop(size, S390_ZERO_EXTEND_8, dst, opnd); |
| break; |
| |
| case Iop_16Uto32: |
| case Iop_16Uto64: |
| insn = s390_insn_unop(size, S390_ZERO_EXTEND_16, dst, opnd); |
| break; |
| |
| case Iop_32Uto64: |
| insn = s390_insn_unop(size, S390_ZERO_EXTEND_32, dst, opnd); |
| break; |
| |
| case Iop_8Sto16: |
| case Iop_8Sto32: |
| case Iop_8Sto64: |
| insn = s390_insn_unop(size, S390_SIGN_EXTEND_8, dst, opnd); |
| break; |
| |
| case Iop_16Sto32: |
| case Iop_16Sto64: |
| insn = s390_insn_unop(size, S390_SIGN_EXTEND_16, dst, opnd); |
| break; |
| |
| case Iop_32Sto64: |
| insn = s390_insn_unop(size, S390_SIGN_EXTEND_32, dst, opnd); |
| break; |
| |
| case Iop_64to8: |
| case Iop_64to16: |
| case Iop_64to32: |
| case Iop_32to8: |
| case Iop_32to16: |
| case Iop_16to8: |
| /* Down-casts are no-ops. Upstream operations will only look at |
| the bytes that make up the result of the down-cast. So there |
| is no point setting the other bytes to 0. */ |
| insn = s390_opnd_copy(8, dst, opnd); |
| break; |
| |
| case Iop_64HIto32: |
| addInstr(env, s390_opnd_copy(8, dst, opnd)); |
| shift.variant.imm = 32; |
| insn = s390_insn_alu(8, S390_ALU_RSH, dst, shift); |
| break; |
| |
| case Iop_32HIto16: |
| addInstr(env, s390_opnd_copy(4, dst, opnd)); |
| shift.variant.imm = 16; |
| insn = s390_insn_alu(4, S390_ALU_RSH, dst, shift); |
| break; |
| |
| case Iop_16HIto8: |
| addInstr(env, s390_opnd_copy(2, dst, opnd)); |
| shift.variant.imm = 8; |
| insn = s390_insn_alu(2, S390_ALU_RSH, dst, shift); |
| break; |
| |
| case Iop_Not8: |
| case Iop_Not16: |
| case Iop_Not32: |
| case Iop_Not64: |
| /* XOR with ffff... */ |
| mask.variant.imm = ~(ULong)0; |
| addInstr(env, s390_opnd_copy(size, dst, opnd)); |
| insn = s390_insn_alu(size, S390_ALU_XOR, dst, mask); |
| break; |
| |
| case Iop_Left8: |
| case Iop_Left16: |
| case Iop_Left32: |
| case Iop_Left64: |
| addInstr(env, s390_insn_unop(size, S390_NEGATE, dst, opnd)); |
| insn = s390_insn_alu(size, S390_ALU_OR, dst, opnd); |
| break; |
| |
| case Iop_CmpwNEZ32: |
| case Iop_CmpwNEZ64: { |
| /* Use the fact that x | -x == 0 iff x == 0. Otherwise, either X |
| or -X will have a 1 in the MSB. */ |
| addInstr(env, s390_insn_unop(size, S390_NEGATE, dst, opnd)); |
| addInstr(env, s390_insn_alu(size, S390_ALU_OR, dst, opnd)); |
| shift.variant.imm = (unop == Iop_CmpwNEZ32) ? 31 : 63; |
| addInstr(env, s390_insn_alu(size, S390_ALU_RSHA, dst, shift)); |
| return dst; |
| } |
| |
| case Iop_Clz64: { |
| HReg r10, r11; |
| |
| /* This will be implemented using FLOGR, if possible. So we need to |
| set aside a pair of non-virtual registers. The result (number of |
| left-most zero bits) will be in r10. The value in r11 is unspecified |
| and must not be used. */ |
| r10 = make_gpr(10); |
| r11 = make_gpr(11); |
| |
| addInstr(env, s390_insn_clz(8, r10, r11, opnd)); |
| addInstr(env, s390_insn_move(8, dst, r10)); |
| return dst; |
| } |
| |
| default: |
| goto irreducible; |
| } |
| |
| addInstr(env, insn); |
| |
| return dst; |
| } |
| |
| /* --------- GET --------- */ |
| case Iex_Get: { |
| HReg dst = newVRegI(env); |
| s390_amode *am = s390_amode_for_guest_state(expr->Iex.Get.offset); |
| |
| /* We never load more than 8 bytes from the guest state, because the |
| floating point register pair is not contiguous. */ |
| vassert(size <= 8); |
| |
| addInstr(env, s390_insn_load(size, dst, am)); |
| |
| return dst; |
| } |
| |
| case Iex_GetI: |
| /* not needed */ |
| break; |
| |
| /* --------- CCALL --------- */ |
| case Iex_CCall: { |
| HReg dst = newVRegI(env); |
| |
| doHelperCall(env, False, NULL, expr->Iex.CCall.cee, |
| expr->Iex.CCall.args, dst); |
| return dst; |
| } |
| |
| /* --------- LITERAL --------- */ |
| |
| /* Load a literal into a register. Create a "load immediate" |
| v-insn and return the register. */ |
| case Iex_Const: { |
| ULong value; |
| HReg dst = newVRegI(env); |
| const IRConst *con = expr->Iex.Const.con; |
| |
| /* Bitwise copy of the value. No sign/zero-extension */ |
| switch (con->tag) { |
| case Ico_U64: value = con->Ico.U64; break; |
| case Ico_U32: value = con->Ico.U32; break; |
| case Ico_U16: value = con->Ico.U16; break; |
| case Ico_U8: value = con->Ico.U8; break; |
| default: vpanic("s390_isel_int_expr: invalid constant"); |
| } |
| |
| addInstr(env, s390_insn_load_immediate(size, dst, value)); |
| |
| return dst; |
| } |
| |
| /* --------- MULTIPLEX --------- */ |
| case Iex_Mux0X: { |
| IRExpr *cond_expr; |
| HReg dst, tmp, rX; |
| s390_opnd_RMI cond, r0, zero; |
| |
| cond_expr = expr->Iex.Mux0X.cond; |
| |
| dst = newVRegI(env); |
| r0 = s390_isel_int_expr_RMI(env, expr->Iex.Mux0X.expr0); |
| rX = s390_isel_int_expr(env, expr->Iex.Mux0X.exprX); |
| size = sizeofIRType(typeOfIRExpr(env->type_env, expr->Iex.Mux0X.exprX)); |
| |
| if (cond_expr->tag == Iex_Unop && cond_expr->Iex.Unop.op == Iop_1Uto8) { |
| s390_cc_t cc = s390_isel_cc(env, cond_expr->Iex.Unop.arg); |
| |
| addInstr(env, s390_insn_move(size, dst, rX)); |
| addInstr(env, s390_insn_cond_move(size, s390_cc_invert(cc), dst, r0)); |
| return dst; |
| } |
| |
| /* Assume the condition is true and move rX to the destination reg. */ |
| addInstr(env, s390_insn_move(size, dst, rX)); |
| |
| /* Compute the condition ... */ |
| cond = s390_isel_int_expr_RMI(env, cond_expr); |
| |
| /* tmp = cond & 0xFF */ |
| tmp = newVRegI(env); |
| addInstr(env, s390_insn_load_immediate(4, tmp, 0xFF)); |
| addInstr(env, s390_insn_alu(4, S390_ALU_AND, tmp, cond)); |
| |
| /* ... and compare it with zero */ |
| zero = s390_opnd_imm(0); |
| addInstr(env, s390_insn_compare(4, tmp, zero, 0 /* signed */)); |
| |
| /* ... and if it compared equal move r0 to the destination reg. */ |
| size = sizeofIRType(typeOfIRExpr(env->type_env, expr->Iex.Mux0X.expr0)); |
| addInstr(env, s390_insn_cond_move(size, S390_CC_E, dst, r0)); |
| |
| return dst; |
| } |
| |
| default: |
| break; |
| } |
| |
| /* We get here if no pattern matched. */ |
| irreducible: |
| ppIRExpr(expr); |
| vpanic("s390_isel_int_expr: cannot reduce tree"); |
| } |
| |
| |
| static HReg |
| s390_isel_int_expr(ISelEnv *env, IRExpr *expr) |
| { |
| HReg dst = s390_isel_int_expr_wrk(env, expr); |
| |
| /* Sanity checks ... */ |
| vassert(hregClass(dst) == HRcInt64); |
| vassert(hregIsVirtual(dst)); |
| |
| return dst; |
| } |
| |
| |
| static s390_opnd_RMI |
| s390_isel_int_expr_RMI(ISelEnv *env, IRExpr *expr) |
| { |
| IRType ty = typeOfIRExpr(env->type_env, expr); |
| s390_opnd_RMI dst; |
| |
| vassert(ty == Ity_I8 || ty == Ity_I16 || ty == Ity_I32 || |
| ty == Ity_I64); |
| |
| if (expr->tag == Iex_Load) { |
| dst.tag = S390_OPND_AMODE; |
| dst.variant.am = s390_isel_amode(env, expr->Iex.Load.addr); |
| } else if (expr->tag == Iex_Get) { |
| dst.tag = S390_OPND_AMODE; |
| dst.variant.am = s390_amode_for_guest_state(expr->Iex.Get.offset); |
| } else if (expr->tag == Iex_Const) { |
| ULong value; |
| |
| /* The bit pattern for the value will be stored as is in the least |
| significant bits of VALUE. */ |
| switch (expr->Iex.Const.con->tag) { |
| case Ico_U1: value = expr->Iex.Const.con->Ico.U1; break; |
| case Ico_U8: value = expr->Iex.Const.con->Ico.U8; break; |
| case Ico_U16: value = expr->Iex.Const.con->Ico.U16; break; |
| case Ico_U32: value = expr->Iex.Const.con->Ico.U32; break; |
| case Ico_U64: value = expr->Iex.Const.con->Ico.U64; break; |
| default: |
| vpanic("s390_isel_int_expr_RMI"); |
| } |
| |
| dst.tag = S390_OPND_IMMEDIATE; |
| dst.variant.imm = value; |
| } else { |
| dst.tag = S390_OPND_REG; |
| dst.variant.reg = s390_isel_int_expr(env, expr); |
| } |
| |
| return dst; |
| } |
| |
| |
| /*---------------------------------------------------------*/ |
| /*--- ISEL: Floating point expressions (128 bit) ---*/ |
| /*---------------------------------------------------------*/ |
| static void |
| s390_isel_float128_expr_wrk(HReg *dst_hi, HReg *dst_lo, ISelEnv *env, |
| IRExpr *expr) |
| { |
| IRType ty = typeOfIRExpr(env->type_env, expr); |
| |
| vassert(ty == Ity_F128); |
| |
| /* Read 128-bit IRTemp */ |
| if (expr->tag == Iex_RdTmp) { |
| lookupIRTemp128(dst_hi, dst_lo, env, expr->Iex.RdTmp.tmp); |
| return; |
| } |
| |
| switch (expr->tag) { |
| case Iex_RdTmp: |
| /* Return the virtual registers that hold the temporary. */ |
| lookupIRTemp128(dst_hi, dst_lo, env, expr->Iex.RdTmp.tmp); |
| return; |
| |
| /* --------- LOAD --------- */ |
| case Iex_Load: { |
| IRExpr *addr_hi, *addr_lo; |
| s390_amode *am_hi, *am_lo; |
| |
| if (expr->Iex.Load.end != Iend_BE) |
| goto irreducible; |
| |
| addr_hi = expr->Iex.Load.addr; |
| addr_lo = IRExpr_Binop(Iop_Add64, addr_hi, mkU64(8)); |
| |
| am_hi = s390_isel_amode(env, addr_hi); |
| am_lo = s390_isel_amode(env, addr_lo); |
| |
| *dst_hi = newVRegF(env); |
| *dst_lo = newVRegF(env); |
| addInstr(env, s390_insn_load(8, *dst_hi, am_hi)); |
| addInstr(env, s390_insn_load(8, *dst_hi, am_lo)); |
| return; |
| } |
| |
| |
| /* --------- GET --------- */ |
| case Iex_Get: |
| /* This is not supported because loading 128-bit from the guest |
| state is almost certainly wrong. Use get_fpr_pair instead. */ |
| vpanic("Iex_Get with F128 data"); |
| |
| /* --------- 4-ary OP --------- */ |
| case Iex_Qop: |
| vpanic("Iex_Qop with F128 data"); |
| |
| /* --------- TERNARY OP --------- */ |
| case Iex_Triop: { |
| IRTriop *triop = expr->Iex.Triop.details; |
| IROp op = triop->op; |
| IRExpr *left = triop->arg2; |
| IRExpr *right = triop->arg3; |
| s390_bfp_binop_t bfpop; |
| s390_round_t rounding_mode; |
| HReg op1_hi, op1_lo, op2_hi, op2_lo, f12, f13, f14, f15; |
| |
| s390_isel_float128_expr(&op1_hi, &op1_lo, env, left); /* 1st operand */ |
| s390_isel_float128_expr(&op2_hi, &op2_lo, env, right); /* 2nd operand */ |
| |
| /* We use non-virtual registers as pairs (f13, f15) and (f12, f14)) */ |
| f12 = make_fpr(12); |
| f13 = make_fpr(13); |
| f14 = make_fpr(14); |
| f15 = make_fpr(15); |
| |
| /* 1st operand --> (f12, f14) */ |
| addInstr(env, s390_insn_move(8, f12, op1_hi)); |
| addInstr(env, s390_insn_move(8, f14, op1_lo)); |
| |
| /* 2nd operand --> (f13, f15) */ |
| addInstr(env, s390_insn_move(8, f13, op2_hi)); |
| addInstr(env, s390_insn_move(8, f15, op2_lo)); |
| |
| switch (op) { |
| case Iop_AddF128: bfpop = S390_BFP_ADD; break; |
| case Iop_SubF128: bfpop = S390_BFP_SUB; break; |
| case Iop_MulF128: bfpop = S390_BFP_MUL; break; |
| case Iop_DivF128: bfpop = S390_BFP_DIV; break; |
| default: |
| goto irreducible; |
| } |
| |
| rounding_mode = decode_rounding_mode(triop->arg1); |
| addInstr(env, s390_insn_bfp128_binop(16, bfpop, f12, f14, f13, |
| f15, rounding_mode)); |
| |
| /* Move result to virtual destination register */ |
| *dst_hi = newVRegF(env); |
| *dst_lo = newVRegF(env); |
| addInstr(env, s390_insn_move(8, *dst_hi, f12)); |
| addInstr(env, s390_insn_move(8, *dst_lo, f14)); |
| |
| return; |
| } |
| |
| /* --------- BINARY OP --------- */ |
| case Iex_Binop: { |
| HReg op_hi, op_lo, f12, f13, f14, f15; |
| s390_bfp_unop_t bfpop; |
| s390_round_t rounding_mode; |
| |
| /* We use non-virtual registers as pairs (f13, f15) and (f12, f14)) */ |
| f12 = make_fpr(12); |
| f13 = make_fpr(13); |
| f14 = make_fpr(14); |
| f15 = make_fpr(15); |
| |
| switch (expr->Iex.Binop.op) { |
| case Iop_SqrtF128: |
| s390_isel_float128_expr(&op_hi, &op_lo, env, expr->Iex.Binop.arg2); |
| |
| /* operand --> (f13, f15) */ |
| addInstr(env, s390_insn_move(8, f13, op_hi)); |
| addInstr(env, s390_insn_move(8, f15, op_lo)); |
| |
| bfpop = S390_BFP_SQRT; |
| rounding_mode = decode_rounding_mode(expr->Iex.Binop.arg1); |
| |
| addInstr(env, s390_insn_bfp128_unop(16, bfpop, f12, f14, f13, f15, |
| rounding_mode)); |
| |
| /* Move result to virtual destination registers */ |
| *dst_hi = newVRegF(env); |
| *dst_lo = newVRegF(env); |
| addInstr(env, s390_insn_move(8, *dst_hi, f12)); |
| addInstr(env, s390_insn_move(8, *dst_lo, f14)); |
| return; |
| |
| case Iop_F64HLtoF128: |
| *dst_hi = s390_isel_float_expr(env, expr->Iex.Binop.arg1); |
| *dst_lo = s390_isel_float_expr(env, expr->Iex.Binop.arg2); |
| return; |
| |
| default: |
| goto irreducible; |
| } |
| } |
| |
| /* --------- UNARY OP --------- */ |
| case Iex_Unop: { |
| IRExpr *left = expr->Iex.Unop.arg; |
| s390_bfp_unop_t bfpop; |
| s390_round_t rounding_mode; |
| s390_conv_t conv; |
| HReg op_hi, op_lo, op, f12, f13, f14, f15; |
| |
| /* We use non-virtual registers as pairs (f13, f15) and (f12, f14)) */ |
| f12 = make_fpr(12); |
| f13 = make_fpr(13); |
| f14 = make_fpr(14); |
| f15 = make_fpr(15); |
| |
| switch (expr->Iex.Unop.op) { |
| case Iop_NegF128: bfpop = S390_BFP_NEG; goto float128_opnd; |
| case Iop_AbsF128: bfpop = S390_BFP_ABS; goto float128_opnd; |
| case Iop_I32StoF128: conv = S390_BFP_I32_TO_F128; goto convert_int; |
| case Iop_I64StoF128: conv = S390_BFP_I64_TO_F128; goto convert_int; |
| case Iop_I32UtoF128: conv = S390_BFP_U32_TO_F128; goto convert_int; |
| case Iop_I64UtoF128: conv = S390_BFP_U64_TO_F128; goto convert_int; |
| case Iop_F32toF128: conv = S390_BFP_F32_TO_F128; goto convert_float; |
| case Iop_F64toF128: conv = S390_BFP_F64_TO_F128; goto convert_float; |
| default: |
| goto irreducible; |
| } |
| |
| float128_opnd: |
| s390_isel_float128_expr(&op_hi, &op_lo, env, left); |
| |
| /* operand --> (f13, f15) */ |
| addInstr(env, s390_insn_move(8, f13, op_hi)); |
| addInstr(env, s390_insn_move(8, f15, op_lo)); |
| |
| rounding_mode = S390_ROUND_NEAREST_EVEN; /* will not be used later on */ |
| addInstr(env, s390_insn_bfp128_unop(16, bfpop, f12, f14, f13, f15, |
| rounding_mode)); |
| goto move_dst; |
| |
| convert_float: |
| op = s390_isel_float_expr(env, left); |
| addInstr(env, s390_insn_bfp128_convert_to(16, conv, f12, f14, op)); |
| goto move_dst; |
| |
| convert_int: |
| op = s390_isel_int_expr(env, left); |
| addInstr(env, s390_insn_bfp128_convert_to(16, conv, f12, f14, op)); |
| goto move_dst; |
| |
| move_dst: |
| /* Move result to virtual destination registers */ |
| *dst_hi = newVRegF(env); |
| *dst_lo = newVRegF(env); |
| addInstr(env, s390_insn_move(8, *dst_hi, f12)); |
| addInstr(env, s390_insn_move(8, *dst_lo, f14)); |
| return; |
| } |
| |
| default: |
| goto irreducible; |
| } |
| |
| /* We get here if no pattern matched. */ |
| irreducible: |
| ppIRExpr(expr); |
| vpanic("s390_isel_int_expr: cannot reduce tree"); |
| } |
| |
| /* Compute a 128-bit value into two 64-bit registers. These may be either |
| real or virtual regs; in any case they must not be changed by subsequent |
| code emitted by the caller. */ |
| static void |
| s390_isel_float128_expr(HReg *dst_hi, HReg *dst_lo, ISelEnv *env, IRExpr *expr) |
| { |
| s390_isel_float128_expr_wrk(dst_hi, dst_lo, env, expr); |
| |
| /* Sanity checks ... */ |
| vassert(hregIsVirtual(*dst_hi)); |
| vassert(hregIsVirtual(*dst_lo)); |
| vassert(hregClass(*dst_hi) == HRcFlt64); |
| vassert(hregClass(*dst_lo) == HRcFlt64); |
| } |
| |
| |
| /*---------------------------------------------------------*/ |
| /*--- ISEL: Floating point expressions (64 bit) ---*/ |
| /*---------------------------------------------------------*/ |
| |
| static HReg |
| s390_isel_float_expr_wrk(ISelEnv *env, IRExpr *expr) |
| { |
| IRType ty = typeOfIRExpr(env->type_env, expr); |
| UChar size; |
| |
| vassert(ty == Ity_F32 || ty == Ity_F64); |
| |
| size = sizeofIRType(ty); |
| |
| switch (expr->tag) { |
| case Iex_RdTmp: |
| /* Return the virtual register that holds the temporary. */ |
| return lookupIRTemp(env, expr->Iex.RdTmp.tmp); |
| |
| /* --------- LOAD --------- */ |
| case Iex_Load: { |
| HReg dst = newVRegF(env); |
| s390_amode *am = s390_isel_amode(env, expr->Iex.Load.addr); |
| |
| if (expr->Iex.Load.end != Iend_BE) |
| goto irreducible; |
| |
| addInstr(env, s390_insn_load(size, dst, am)); |
| |
| return dst; |
| } |
| |
| /* --------- GET --------- */ |
| case Iex_Get: { |
| HReg dst = newVRegF(env); |
| s390_amode *am = s390_amode_for_guest_state(expr->Iex.Get.offset); |
| |
| addInstr(env, s390_insn_load(size, dst, am)); |
| |
| return dst; |
| } |
| |
| /* --------- LITERAL --------- */ |
| |
| /* Load a literal into a register. Create a "load immediate" |
| v-insn and return the register. */ |
| case Iex_Const: { |
| ULong value; |
| HReg dst = newVRegF(env); |
| const IRConst *con = expr->Iex.Const.con; |
| |
| /* Bitwise copy of the value. No sign/zero-extension */ |
| switch (con->tag) { |
| case Ico_F32i: value = con->Ico.F32i; break; |
| case Ico_F64i: value = con->Ico.F64i; break; |
| default: vpanic("s390_isel_float_expr: invalid constant"); |
| } |
| |
| if (value != 0) vpanic("cannot load immediate floating point constant"); |
| |
| addInstr(env, s390_insn_load_immediate(size, dst, value)); |
| |
| return dst; |
| } |
| |
| /* --------- 4-ary OP --------- */ |
| case Iex_Qop: { |
| HReg op1, op2, op3, dst; |
| s390_bfp_triop_t bfpop; |
| s390_round_t rounding_mode; |
| |
| op1 = s390_isel_float_expr(env, expr->Iex.Qop.details->arg2); |
| op2 = s390_isel_float_expr(env, expr->Iex.Qop.details->arg3); |
| op3 = s390_isel_float_expr(env, expr->Iex.Qop.details->arg4); |
| dst = newVRegF(env); |
| addInstr(env, s390_insn_move(size, dst, op1)); |
| |
| switch (expr->Iex.Qop.details->op) { |
| case Iop_MAddF32: |
| case Iop_MAddF64: bfpop = S390_BFP_MADD; break; |
| case Iop_MSubF32: |
| case Iop_MSubF64: bfpop = S390_BFP_MSUB; break; |
| |
| default: |
| goto irreducible; |
| } |
| |
| rounding_mode = decode_rounding_mode(expr->Iex.Qop.details->arg1); |
| addInstr(env, s390_insn_bfp_triop(size, bfpop, dst, op2, op3, |
| rounding_mode)); |
| return dst; |
| } |
| |
| /* --------- TERNARY OP --------- */ |
| case Iex_Triop: { |
| IRTriop *triop = expr->Iex.Triop.details; |
| IROp op = triop->op; |
| IRExpr *left = triop->arg2; |
| IRExpr *right = triop->arg3; |
| s390_bfp_binop_t bfpop; |
| s390_round_t rounding_mode; |
| HReg h1, op2, dst; |
| |
| h1 = s390_isel_float_expr(env, left); /* Process 1st operand */ |
| op2 = s390_isel_float_expr(env, right); /* Process 2nd operand */ |
| dst = newVRegF(env); |
| addInstr(env, s390_insn_move(size, dst, h1)); |
| switch (op) { |
| case Iop_AddF32: |
| case Iop_AddF64: bfpop = S390_BFP_ADD; break; |
| case Iop_SubF32: |
| case Iop_SubF64: bfpop = S390_BFP_SUB; break; |
| case Iop_MulF32: |
| case Iop_MulF64: bfpop = S390_BFP_MUL; break; |
| case Iop_DivF32: |
| case Iop_DivF64: bfpop = S390_BFP_DIV; break; |
| |
| default: |
| goto irreducible; |
| } |
| |
| rounding_mode = decode_rounding_mode(triop->arg1); |
| addInstr(env, s390_insn_bfp_binop(size, bfpop, dst, op2, rounding_mode)); |
| return dst; |
| } |
| |
| /* --------- BINARY OP --------- */ |
| case Iex_Binop: { |
| IROp op = expr->Iex.Binop.op; |
| IRExpr *irrm = expr->Iex.Binop.arg1; |
| IRExpr *left = expr->Iex.Binop.arg2; |
| HReg h1, dst; |
| s390_round_t rounding_mode; |
| s390_conv_t conv; |
| |
| switch (op) { |
| case Iop_SqrtF32: |
| case Iop_SqrtF64: |
| h1 = s390_isel_float_expr(env, left); |
| dst = newVRegF(env); |
| rounding_mode = decode_rounding_mode(irrm); |
| addInstr(env, s390_insn_bfp_unop(size, S390_BFP_SQRT, dst, h1, |
| rounding_mode)); |
| return dst; |
| |
| case Iop_F64toF32: conv = S390_BFP_F64_TO_F32; goto convert_float; |
| case Iop_I32StoF32: conv = S390_BFP_I32_TO_F32; goto convert_int; |
| case Iop_I32UtoF32: conv = S390_BFP_U32_TO_F32; goto convert_int; |
| case Iop_I64StoF32: conv = S390_BFP_I64_TO_F32; goto convert_int; |
| case Iop_I64StoF64: conv = S390_BFP_I64_TO_F64; goto convert_int; |
| case Iop_I64UtoF32: conv = S390_BFP_U64_TO_F32; goto convert_int; |
| case Iop_I64UtoF64: conv = S390_BFP_U64_TO_F64; goto convert_int; |
| |
| convert_float: |
| h1 = s390_isel_float_expr(env, left); |
| goto convert; |
| |
| convert_int: |
| h1 = s390_isel_int_expr(env, left); |
| goto convert; |
| |
| convert: |
| dst = newVRegF(env); |
| rounding_mode = decode_rounding_mode(irrm); |
| addInstr(env, s390_insn_bfp_convert(size, conv, dst, h1, |
| rounding_mode)); |
| return dst; |
| |
| default: |
| goto irreducible; |
| |
| case Iop_F128toF64: |
| case Iop_F128toF32: { |
| HReg op_hi, op_lo, f13, f15; |
| |
| conv = op == Iop_F128toF32 ? S390_BFP_F128_TO_F32 |
| : S390_BFP_F128_TO_F64; |
| |
| rounding_mode = decode_rounding_mode(irrm); |
| |
| s390_isel_float128_expr(&op_hi, &op_lo, env, left); |
| |
| /* We use non-virtual registers as pairs (f13, f15) */ |
| f13 = make_fpr(13); |
| f15 = make_fpr(15); |
| |
| /* operand --> (f13, f15) */ |
| addInstr(env, s390_insn_move(8, f13, op_hi)); |
| addInstr(env, s390_insn_move(8, f15, op_lo)); |
| |
| dst = newVRegF(env); |
| addInstr(env, s390_insn_bfp128_convert_from(16, conv, dst, f13, f15, |
| rounding_mode)); |
| return dst; |
| } |
| } |
| } |
| |
| /* --------- UNARY OP --------- */ |
| case Iex_Unop: { |
| IROp op = expr->Iex.Unop.op; |
| IRExpr *left = expr->Iex.Unop.arg; |
| s390_bfp_unop_t bfpop; |
| /* No rounding mode is needed for these conversions. Provide the |
| default rounding mode. It will not be used. */ |
| s390_round_t rounding_mode = S390_ROUND_NEAREST_EVEN; |
| s390_conv_t conv; |
| HReg h1, dst; |
| |
| if (op == Iop_F128HItoF64 || op == Iop_F128LOtoF64) { |
| HReg dst_hi, dst_lo; |
| |
| s390_isel_float128_expr(&dst_hi, &dst_lo, env, left); |
| return op == Iop_F128LOtoF64 ? dst_lo : dst_hi; |
| } |
| |
| if (op == Iop_ReinterpI64asF64 || op == Iop_ReinterpI32asF32) { |
| dst = newVRegF(env); |
| h1 = s390_isel_int_expr(env, left); /* Process the operand */ |
| addInstr(env, s390_insn_move(size, dst, h1)); |
| |
| return dst; |
| } |
| |
| switch (op) { |
| case Iop_NegF32: |
| case Iop_NegF64: |
| if (left->tag == Iex_Unop && |
| (left->Iex.Unop.op == Iop_AbsF32 || left->Iex.Unop.op == Iop_AbsF64)) |
| bfpop = S390_BFP_NABS; |
| else |
| bfpop = S390_BFP_NEG; |
| break; |
| |
| case Iop_AbsF32: |
| case Iop_AbsF64: |
| bfpop = S390_BFP_ABS; |
| break; |
| |
| case Iop_I32StoF64: conv = S390_BFP_I32_TO_F64; goto convert_int1; |
| case Iop_I32UtoF64: conv = S390_BFP_U32_TO_F64; goto convert_int1; |
| case Iop_F32toF64: conv = S390_BFP_F32_TO_F64; goto convert_float1; |
| |
| convert_float1: |
| h1 = s390_isel_float_expr(env, left); |
| goto convert1; |
| |
| convert_int1: |
| h1 = s390_isel_int_expr(env, left); |
| goto convert1; |
| |
| convert1: |
| dst = newVRegF(env); |
| addInstr(env, s390_insn_bfp_convert(size, conv, dst, h1, rounding_mode)); |
| return dst; |
| |
| default: |
| goto irreducible; |
| } |
| |
| /* Process operand */ |
| h1 = s390_isel_float_expr(env, left); |
| dst = newVRegF(env); |
| addInstr(env, s390_insn_bfp_unop(size, bfpop, dst, h1, rounding_mode)); |
| return dst; |
| } |
| |
| default: |
| goto irreducible; |
| } |
| |
| /* We get here if no pattern matched. */ |
| irreducible: |
| ppIRExpr(expr); |
| vpanic("s390_isel_float_expr: cannot reduce tree"); |
| } |
| |
| |
| static HReg |
| s390_isel_float_expr(ISelEnv *env, IRExpr *expr) |
| { |
| HReg dst = s390_isel_float_expr_wrk(env, expr); |
| |
| /* Sanity checks ... */ |
| vassert(hregClass(dst) == HRcFlt64); |
| vassert(hregIsVirtual(dst)); |
| |
| return dst; |
| } |
| |
| |
| /*---------------------------------------------------------*/ |
| /*--- ISEL: Condition Code ---*/ |
| /*---------------------------------------------------------*/ |
| |
| /* This function handles all operators that produce a 1-bit result */ |
| static s390_cc_t |
| s390_isel_cc(ISelEnv *env, IRExpr *cond) |
| { |
| UChar size; |
| |
| vassert(typeOfIRExpr(env->type_env, cond) == Ity_I1); |
| |
| /* Constant: either 1 or 0 */ |
| if (cond->tag == Iex_Const) { |
| vassert(cond->Iex.Const.con->tag == Ico_U1); |
| vassert(cond->Iex.Const.con->Ico.U1 == True |
| || cond->Iex.Const.con->Ico.U1 == False); |
| |
| return cond->Iex.Const.con->Ico.U1 == True ? S390_CC_ALWAYS : S390_CC_NEVER; |
| } |
| |
| /* Variable: values are 1 or 0 */ |
| if (cond->tag == Iex_RdTmp) { |
| IRTemp tmp = cond->Iex.RdTmp.tmp; |
| HReg reg = lookupIRTemp(env, tmp); |
| |
| /* Load-and-test does not modify REG; so this is OK. */ |
| if (typeOfIRTemp(env->type_env, tmp) == Ity_I1) |
| size = 4; |
| else |
| size = sizeofIRType(typeOfIRTemp(env->type_env, tmp)); |
| addInstr(env, s390_insn_test(size, s390_opnd_reg(reg))); |
| return S390_CC_NE; |
| } |
| |
| /* Unary operators */ |
| if (cond->tag == Iex_Unop) { |
| IRExpr *arg = cond->Iex.Unop.arg; |
| |
| switch (cond->Iex.Unop.op) { |
| case Iop_Not1: /* Not1(cond) */ |
| /* Generate code for EXPR, and negate the test condition */ |
| return s390_cc_invert(s390_isel_cc(env, arg)); |
| |
| /* Iop_32/64to1 select the LSB from their operand */ |
| case Iop_32to1: |
| case Iop_64to1: { |
| HReg dst = newVRegI(env); |
| HReg h1 = s390_isel_int_expr(env, arg); |
| |
| size = sizeofIRType(typeOfIRExpr(env->type_env, arg)); |
| |
| addInstr(env, s390_insn_move(size, dst, h1)); |
| addInstr(env, s390_insn_alu(size, S390_ALU_AND, dst, s390_opnd_imm(1))); |
| addInstr(env, s390_insn_test(size, s390_opnd_reg(dst))); |
| return S390_CC_NE; |
| } |
| |
| case Iop_CmpNEZ8: |
| case Iop_CmpNEZ16: { |
| s390_opnd_RMI src; |
| s390_unop_t op; |
| HReg dst; |
| |
| op = (cond->Iex.Unop.op == Iop_CmpNEZ8) ? S390_ZERO_EXTEND_8 |
| : S390_ZERO_EXTEND_16; |
| dst = newVRegI(env); |
| src = s390_isel_int_expr_RMI(env, arg); |
| addInstr(env, s390_insn_unop(4, op, dst, src)); |
| addInstr(env, s390_insn_test(4, s390_opnd_reg(dst))); |
| return S390_CC_NE; |
| } |
| |
| case Iop_CmpNEZ32: |
| case Iop_CmpNEZ64: { |
| s390_opnd_RMI src; |
| |
| src = s390_isel_int_expr_RMI(env, arg); |
| size = sizeofIRType(typeOfIRExpr(env->type_env, arg)); |
| addInstr(env, s390_insn_test(size, src)); |
| return S390_CC_NE; |
| } |
| |
| default: |
| goto fail; |
| } |
| } |
| |
| /* Binary operators */ |
| if (cond->tag == Iex_Binop) { |
| IRExpr *arg1 = cond->Iex.Binop.arg1; |
| IRExpr *arg2 = cond->Iex.Binop.arg2; |
| HReg reg1, reg2; |
| |
| size = sizeofIRType(typeOfIRExpr(env->type_env, arg1)); |
| |
| switch (cond->Iex.Binop.op) { |
| s390_unop_t op; |
| s390_cc_t result; |
| |
| case Iop_CmpEQ8: |
| case Iop_CasCmpEQ8: |
| op = S390_ZERO_EXTEND_8; |
| result = S390_CC_E; |
| goto do_compare_ze; |
| |
| case Iop_CmpNE8: |
| case Iop_CasCmpNE8: |
| op = S390_ZERO_EXTEND_8; |
| result = S390_CC_NE; |
| goto do_compare_ze; |
| |
| case Iop_CmpEQ16: |
| case Iop_CasCmpEQ16: |
| op = S390_ZERO_EXTEND_16; |
| result = S390_CC_E; |
| goto do_compare_ze; |
| |
| case Iop_CmpNE16: |
| case Iop_CasCmpNE16: |
| op = S390_ZERO_EXTEND_16; |
| result = S390_CC_NE; |
| goto do_compare_ze; |
| |
| do_compare_ze: { |
| s390_opnd_RMI op1, op2; |
| |
| op1 = s390_isel_int_expr_RMI(env, arg1); |
| reg1 = newVRegI(env); |
| addInstr(env, s390_insn_unop(4, op, reg1, op1)); |
| |
| op2 = s390_isel_int_expr_RMI(env, arg2); |
| reg2 = newVRegI(env); |
| addInstr(env, s390_insn_unop(4, op, reg2, op2)); /* zero extend */ |
| |
| op2 = s390_opnd_reg(reg2); |
| addInstr(env, s390_insn_compare(4, reg1, op2, False)); |
| |
| return result; |
| } |
| |
| case Iop_CmpEQ32: |
| case Iop_CmpEQ64: |
| case Iop_CasCmpEQ32: |
| case Iop_CasCmpEQ64: |
| result = S390_CC_E; |
| goto do_compare; |
| |
| case Iop_CmpNE32: |
| case Iop_CmpNE64: |
| case Iop_CasCmpNE32: |
| case Iop_CasCmpNE64: |
| result = S390_CC_NE; |
| goto do_compare; |
| |
| do_compare: { |
| HReg op1; |
| s390_opnd_RMI op2; |
| |
| order_commutative_operands(arg1, arg2); |
| |
| op1 = s390_isel_int_expr(env, arg1); |
| op2 = s390_isel_int_expr_RMI(env, arg2); |
| |
| addInstr(env, s390_insn_compare(size, op1, op2, False)); |
| |
| return result; |
| } |
| |
| case Iop_CmpLT32S: |
| case Iop_CmpLE32S: |
| case Iop_CmpLT64S: |
| case Iop_CmpLE64S: { |
| HReg op1; |
| s390_opnd_RMI op2; |
| |
| op1 = s390_isel_int_expr(env, arg1); |
| op2 = s390_isel_int_expr_RMI(env, arg2); |
| |
| addInstr(env, s390_insn_compare(size, op1, op2, True)); |
| |
| return (cond->Iex.Binop.op == Iop_CmpLT32S || |
| cond->Iex.Binop.op == Iop_CmpLT64S) ? S390_CC_L : S390_CC_LE; |
| } |
| |
| case Iop_CmpLT32U: |
| case Iop_CmpLE32U: |
| case Iop_CmpLT64U: |
| case Iop_CmpLE64U: { |
| HReg op1; |
| s390_opnd_RMI op2; |
| |
| op1 = s390_isel_int_expr(env, arg1); |
| op2 = s390_isel_int_expr_RMI(env, arg2); |
| |
| addInstr(env, s390_insn_compare(size, op1, op2, False)); |
| |
| return (cond->Iex.Binop.op == Iop_CmpLT32U || |
| cond->Iex.Binop.op == Iop_CmpLT64U) ? S390_CC_L : S390_CC_LE; |
| } |
| |
| default: |
| goto fail; |
| } |
| } |
| |
| fail: |
| ppIRExpr(cond); |
| vpanic("s390_isel_cc: unexpected operator"); |
| } |
| |
| |
| /*---------------------------------------------------------*/ |
| /*--- ISEL: Statements ---*/ |
| /*---------------------------------------------------------*/ |
| |
| static void |
| s390_isel_stmt(ISelEnv *env, IRStmt *stmt) |
| { |
| if (vex_traceflags & VEX_TRACE_VCODE) { |
| vex_printf("\n -- "); |
| ppIRStmt(stmt); |
| vex_printf("\n"); |
| } |
| |
| switch (stmt->tag) { |
| |
| /* --------- STORE --------- */ |
| case Ist_Store: { |
| IRType tyd = typeOfIRExpr(env->type_env, stmt->Ist.Store.data); |
| s390_amode *am; |
| HReg src; |
| |
| if (stmt->Ist.Store.end != Iend_BE) goto stmt_fail; |
| |
| am = s390_isel_amode(env, stmt->Ist.Store.addr); |
| |
| switch (tyd) { |
| case Ity_I8: |
| case Ity_I16: |
| case Ity_I32: |
| case Ity_I64: |
| src = s390_isel_int_expr(env, stmt->Ist.Store.data); |
| break; |
| |
| case Ity_F32: |
| case Ity_F64: |
| src = s390_isel_float_expr(env, stmt->Ist.Store.data); |
| break; |
| |
| case Ity_F128: |
| /* Cannot occur. No such instruction */ |
| vpanic("Ist_Store with F128 data"); |
| |
| default: |
| goto stmt_fail; |
| } |
| |
| addInstr(env, s390_insn_store(sizeofIRType(tyd), am, src)); |
| return; |
| } |
| |
| /* --------- PUT --------- */ |
| case Ist_Put: { |
| IRType tyd = typeOfIRExpr(env->type_env, stmt->Ist.Put.data); |
| HReg src; |
| s390_amode *am; |
| ULong new_value, old_value, difference; |
| |
| /* Detect updates to certain guest registers. We track the contents |
| of those registers as long as they contain constants. If the new |
| constant is either zero or in the 8-bit neighbourhood of the |
| current value we can use a memory-to-memory insn to do the update. */ |
| |
| Int offset = stmt->Ist.Put.offset; |
| |
| /* Check necessary conditions: |
| (1) must be one of the registers we care about |
| (2) assigned value must be a constant */ |
| Int guest_reg = get_guest_reg(offset); |
| |
| if (guest_reg == GUEST_UNKNOWN) goto not_special; |
| |
| if (guest_reg == GUEST_IA) { |
| /* If this is the first assignment to the IA reg, don't special case |
| it. We need to do a full 8-byte assignment here. The reason is |
| that in case of a redirected translation the guest IA does not |
| contain the redirected-to address. Instead it contains the |
| redirected-from address and those can be far apart. So in order to |
| do incremnetal updates if the IA in the future we need to get the |
| initial address of the super block correct. */ |
| if (env->first_IA_assignment) { |
| env->first_IA_assignment = False; |
| goto not_special; |
| } |
| } |
| |
| if (stmt->Ist.Put.data->tag != Iex_Const) { |
| /* Invalidate guest register contents */ |
| env->old_value_valid[guest_reg] = False; |
| goto not_special; |
| } |
| |
| /* We can only handle Ity_I64, but the CC_DEPS field can have floats */ |
| if (tyd != Ity_I64) |
| goto not_special; |
| |
| /* OK. Necessary conditions are satisfied. */ |
| |
| old_value = env->old_value[guest_reg]; |
| new_value = stmt->Ist.Put.data->Iex.Const.con->Ico.U64; |
| env->old_value[guest_reg] = new_value; |
| |
| Bool old_value_is_valid = env->old_value_valid[guest_reg]; |
| env->old_value_valid[guest_reg] = True; |
| |
| /* If the register already contains the new value, there is nothing |
| to do here. Unless the guest register requires precise memory |
| exceptions. */ |
| if (old_value_is_valid && new_value == old_value) { |
| if (! guest_s390x_state_requires_precise_mem_exns(offset, offset + 8)) { |
| return; |
| } |
| } |
| |
| /* guest register = 0 */ |
| if (new_value == 0) { |
| addInstr(env, s390_insn_gzero(sizeofIRType(tyd), offset)); |
| return; |
| } |
| |
| if (old_value_is_valid == False) goto not_special; |
| |
| /* If the new value is in the neighbourhood of the old value |
| we can use a memory-to-memory insn */ |
| difference = new_value - old_value; |
| |
| if (s390_host_has_gie && ulong_fits_signed_8bit(difference)) { |
| addInstr(env, s390_insn_gadd(sizeofIRType(tyd), offset, |
| (difference & 0xFF), new_value)); |
| return; |
| } |
| |
| /* If the high word is the same it is sufficient to load the low word. |
| Use R0 as a scratch reg. */ |
| if ((old_value >> 32) == (new_value >> 32)) { |
| HReg r0 = make_gpr(0); |
| HReg gsp = make_gpr(S390_REGNO_GUEST_STATE_POINTER); |
| s390_amode *gam; |
| |
| gam = s390_amode_b12(offset + 4, gsp); |
| addInstr(env, s390_insn_load_immediate(4, r0, |
| new_value & 0xFFFFFFFF)); |
| addInstr(env, s390_insn_store(4, gam, r0)); |
| return; |
| } |
| |
| /* No special case applies... fall through */ |
| |
| not_special: |
| am = s390_amode_for_guest_state(stmt->Ist.Put.offset); |
| |
| switch (tyd) { |
| case Ity_I8: |
| case Ity_I16: |
| case Ity_I32: |
| case Ity_I64: |
| src = s390_isel_int_expr(env, stmt->Ist.Put.data); |
| break; |
| |
| case Ity_F32: |
| case Ity_F64: |
| src = s390_isel_float_expr(env, stmt->Ist.Put.data); |
| break; |
| |
| case Ity_F128: |
| /* Does not occur. See function put_fpr_pair. */ |
| vpanic("Ist_Put with F128 data"); |
| |
| default: |
| goto stmt_fail; |
| } |
| |
| addInstr(env, s390_insn_store(sizeofIRType(tyd), am, src)); |
| return; |
| } |
| |
| /* --------- TMP --------- */ |
| case Ist_WrTmp: { |
| IRTemp tmp = stmt->Ist.WrTmp.tmp; |
| IRType tyd = typeOfIRTemp(env->type_env, tmp); |
| HReg src, dst; |
| |
| switch (tyd) { |
| case Ity_I128: { |
| HReg dst_hi, dst_lo, res_hi, res_lo; |
| |
| s390_isel_int128_expr(&res_hi, &res_lo, env, stmt->Ist.WrTmp.data); |
| lookupIRTemp128(&dst_hi, &dst_lo, env, tmp); |
| |
| addInstr(env, s390_insn_move(8, dst_hi, res_hi)); |
| addInstr(env, s390_insn_move(8, dst_lo, res_lo)); |
| return; |
| } |
| |
| case Ity_I8: |
| case Ity_I16: |
| case Ity_I32: |
| case Ity_I64: |
| src = s390_isel_int_expr(env, stmt->Ist.WrTmp.data); |
| dst = lookupIRTemp(env, tmp); |
| break; |
| |
| case Ity_I1: { |
| s390_cc_t cond = s390_isel_cc(env, stmt->Ist.WrTmp.data); |
| dst = lookupIRTemp(env, tmp); |
| addInstr(env, s390_insn_cc2bool(dst, cond)); |
| return; |
| } |
| |
| case Ity_F32: |
| case Ity_F64: |
| src = s390_isel_float_expr(env, stmt->Ist.WrTmp.data); |
| dst = lookupIRTemp(env, tmp); |
| break; |
| |
| case Ity_F128: { |
| HReg dst_hi, dst_lo, res_hi, res_lo; |
| |
| s390_isel_float128_expr(&res_hi, &res_lo, env, stmt->Ist.WrTmp.data); |
| lookupIRTemp128(&dst_hi, &dst_lo, env, tmp); |
| |
| addInstr(env, s390_insn_move(8, dst_hi, res_hi)); |
| addInstr(env, s390_insn_move(8, dst_lo, res_lo)); |
| return; |
| } |
| |
| default: |
| goto stmt_fail; |
| } |
| |
| addInstr(env, s390_insn_move(sizeofIRType(tyd), dst, src)); |
| return; |
| } |
| |
| /* --------- Call to DIRTY helper --------- */ |
| case Ist_Dirty: { |
| IRType retty; |
| IRDirty* d = stmt->Ist.Dirty.details; |
| Bool passBBP; |
| HReg dst; |
| Int i; |
| |
| /* Invalidate tracked values of those guest state registers that are |
| modified by this helper. */ |
| for (i = 0; i < d->nFxState; ++i) { |
| /* JRS 1 June 2012: AFAICS, s390 guest doesn't use 'repeat' |
| descriptors in guest state effect descriptions. Hence: */ |
| vassert(d->fxState[i].nRepeats == 0 && d->fxState[i].repeatLen == 0); |
| if ((d->fxState[i].fx == Ifx_Write || d->fxState[i].fx == Ifx_Modify)) { |
| Int guest_reg = get_guest_reg(d->fxState[i].offset); |
| if (guest_reg != GUEST_UNKNOWN) |
| env->old_value_valid[guest_reg] = False; |
| } |
| } |
| |
| if (d->nFxState == 0) |
| vassert(!d->needsBBP); |
| |
| passBBP = toBool(d->nFxState > 0 && d->needsBBP); |
| |
| if (d->tmp == IRTemp_INVALID) { |
| /* No return value. */ |
| dst = INVALID_HREG; |
| doHelperCall(env, passBBP, d->guard, d->cee, d->args, dst); |
| return; |
| } |
| |
| retty = typeOfIRTemp(env->type_env, d->tmp); |
| if (retty == Ity_I64 || retty == Ity_I32 |
| || retty == Ity_I16 || retty == Ity_I8) { |
| /* Move the returned value to the destination register */ |
| dst = lookupIRTemp(env, d->tmp); |
| doHelperCall(env, passBBP, d->guard, d->cee, d->args, dst); |
| return; |
| } |
| break; |
| } |
| |
| case Ist_CAS: |
| if (stmt->Ist.CAS.details->oldHi == IRTemp_INVALID) { |
| IRCAS *cas = stmt->Ist.CAS.details; |
| s390_amode *op2 = s390_isel_amode(env, cas->addr); |
| HReg op3 = s390_isel_int_expr(env, cas->dataLo); /* new value */ |
| HReg op1 = s390_isel_int_expr(env, cas->expdLo); /* expected value */ |
| HReg old = lookupIRTemp(env, cas->oldLo); |
| |
| if (typeOfIRTemp(env->type_env, cas->oldLo) == Ity_I32) { |
| addInstr(env, s390_insn_cas(4, op1, op2, op3, old)); |
| } else { |
| addInstr(env, s390_insn_cas(8, op1, op2, op3, old)); |
| } |
| return; |
| } else { |
| IRCAS *cas = stmt->Ist.CAS.details; |
| s390_amode *op2 = s390_isel_amode(env, cas->addr); |
| HReg r8, r9, r10, r11, r1; |
| HReg op3_high = s390_isel_int_expr(env, cas->dataHi); /* new value */ |
| HReg op3_low = s390_isel_int_expr(env, cas->dataLo); /* new value */ |
| HReg op1_high = s390_isel_int_expr(env, cas->expdHi); /* expected value */ |
| HReg op1_low = s390_isel_int_expr(env, cas->expdLo); /* expected value */ |
| HReg old_low = lookupIRTemp(env, cas->oldLo); |
| HReg old_high = lookupIRTemp(env, cas->oldHi); |
| |
| /* Use non-virtual registers r8 and r9 as pair for op1 |
| and move op1 there */ |
| r8 = make_gpr(8); |
| r9 = make_gpr(9); |
| addInstr(env, s390_insn_move(8, r8, op1_high)); |
| addInstr(env, s390_insn_move(8, r9, op1_low)); |
| |
| /* Use non-virtual registers r10 and r11 as pair for op3 |
| and move op3 there */ |
| r10 = make_gpr(10); |
| r11 = make_gpr(11); |
| addInstr(env, s390_insn_move(8, r10, op3_high)); |
| addInstr(env, s390_insn_move(8, r11, op3_low)); |
| |
| /* Register r1 is used as a scratch register */ |
| r1 = make_gpr(1); |
| |
| if (typeOfIRTemp(env->type_env, cas->oldLo) == Ity_I32) { |
| addInstr(env, s390_insn_cdas(4, r8, r9, op2, r10, r11, |
| old_high, old_low, r1)); |
| } else { |
| addInstr(env, s390_insn_cdas(8, r8, r9, op2, r10, r11, |
| old_high, old_low, r1)); |
| } |
| addInstr(env, s390_insn_move(8, op1_high, r8)); |
| addInstr(env, s390_insn_move(8, op1_low, r9)); |
| addInstr(env, s390_insn_move(8, op3_high, r10)); |
| addInstr(env, s390_insn_move(8, op3_low, r11)); |
| return; |
| } |
| break; |
| |
| /* --------- EXIT --------- */ |
| case Ist_Exit: { |
| s390_cc_t cond; |
| IRConstTag tag = stmt->Ist.Exit.dst->tag; |
| |
| if (tag != Ico_U64) |
| vpanic("s390_isel_stmt: Ist_Exit: dst is not a 64-bit value"); |
| |
| s390_amode *guest_IA = s390_amode_for_guest_state(stmt->Ist.Exit.offsIP); |
| cond = s390_isel_cc(env, stmt->Ist.Exit.guard); |
| |
| /* Case: boring transfer to known address */ |
| if (stmt->Ist.Exit.jk == Ijk_Boring) { |
| if (env->chaining_allowed) { |
| /* .. almost always true .. */ |
| /* Skip the event check at the dst if this is a forwards |
| edge. */ |
| Bool to_fast_entry |
| = ((Addr64)stmt->Ist.Exit.dst->Ico.U64) > env->max_ga; |
| if (0) vex_printf("%s", to_fast_entry ? "Y" : ","); |
| addInstr(env, s390_insn_xdirect(cond, stmt->Ist.Exit.dst->Ico.U64, |
| guest_IA, to_fast_entry)); |
| } else { |
| /* .. very occasionally .. */ |
| /* We can't use chaining, so ask for an assisted transfer, |
| as that's the only alternative that is allowable. */ |
| HReg dst = s390_isel_int_expr(env, |
| IRExpr_Const(stmt->Ist.Exit.dst)); |
| addInstr(env, s390_insn_xassisted(cond, dst, guest_IA, Ijk_Boring)); |
| } |
| return; |
| } |
| |
| /* Case: assisted transfer to arbitrary address */ |
| switch (stmt->Ist.Exit.jk) { |
| case Ijk_EmFail: |
| case Ijk_EmWarn: |
| case Ijk_NoDecode: |
| case Ijk_TInval: |
| case Ijk_Sys_syscall: |
| case Ijk_ClientReq: |
| case Ijk_NoRedir: |
| case Ijk_Yield: |
| case Ijk_SigTRAP: { |
| HReg dst = s390_isel_int_expr(env, IRExpr_Const(stmt->Ist.Exit.dst)); |
| addInstr(env, s390_insn_xassisted(cond, dst, guest_IA, |
| stmt->Ist.Exit.jk)); |
| return; |
| } |
| default: |
| break; |
| } |
| |
| /* Do we ever expect to see any other kind? */ |
| goto stmt_fail; |
| } |
| |
| /* --------- MEM FENCE --------- */ |
| case Ist_MBE: |
| switch (stmt->Ist.MBE.event) { |
| case Imbe_Fence: |
| addInstr(env, s390_insn_mfence()); |
| return; |
| default: |
| break; |
| } |
| break; |
| |
| /* --------- Miscellaneous --------- */ |
| |
| case Ist_PutI: /* Not needed */ |
| case Ist_IMark: /* Doesn't generate any executable code */ |
| case Ist_NoOp: /* Doesn't generate any executable code */ |
| case Ist_AbiHint: /* Meaningless in IR */ |
| return; |
| |
| default: |
| break; |
| } |
| |
| stmt_fail: |
| ppIRStmt(stmt); |
| vpanic("s390_isel_stmt"); |
| } |
| |
| |
| /*---------------------------------------------------------*/ |
| /*--- ISEL: Basic block terminators (Nexts) ---*/ |
| /*---------------------------------------------------------*/ |
| |
| static void |
| iselNext(ISelEnv *env, IRExpr *next, IRJumpKind jk, int offsIP) |
| { |
| if (vex_traceflags & VEX_TRACE_VCODE) { |
| vex_printf("\n-- PUT(%d) = ", offsIP); |
| ppIRExpr(next); |
| vex_printf("; exit-"); |
| ppIRJumpKind(jk); |
| vex_printf("\n"); |
| } |
| |
| s390_amode *guest_IA = s390_amode_for_guest_state(offsIP); |
| |
| /* Case: boring transfer to known address */ |
| if (next->tag == Iex_Const) { |
| IRConst *cdst = next->Iex.Const.con; |
| vassert(cdst->tag == Ico_U64); |
| if (jk == Ijk_Boring || jk == Ijk_Call) { |
| /* Boring transfer to known address */ |
| if (env->chaining_allowed) { |
| /* .. almost always true .. */ |
| /* Skip the event check at the dst if this is a forwards |
| edge. */ |
| Bool to_fast_entry |
| = ((Addr64)cdst->Ico.U64) > env->max_ga; |
| if (0) vex_printf("%s", to_fast_entry ? "X" : "."); |
| addInstr(env, s390_insn_xdirect(S390_CC_ALWAYS, cdst->Ico.U64, |
| guest_IA, to_fast_entry)); |
| } else { |
| /* .. very occasionally .. */ |
| /* We can't use chaining, so ask for an indirect transfer, |
| as that's the cheapest alternative that is allowable. */ |
| HReg dst = s390_isel_int_expr(env, next); |
| addInstr(env, s390_insn_xassisted(S390_CC_ALWAYS, dst, guest_IA, |
| Ijk_Boring)); |
| } |
| return; |
| } |
| } |
| |
| /* Case: call/return (==boring) transfer to any address */ |
| switch (jk) { |
| case Ijk_Boring: |
| case Ijk_Ret: |
| case Ijk_Call: { |
| HReg dst = s390_isel_int_expr(env, next); |
| if (env->chaining_allowed) { |
| addInstr(env, s390_insn_xindir(S390_CC_ALWAYS, dst, guest_IA)); |
| } else { |
| addInstr(env, s390_insn_xassisted(S390_CC_ALWAYS, dst, guest_IA, |
| Ijk_Boring)); |
| } |
| return; |
| } |
| default: |
| break; |
| } |
| |
| /* Case: some other kind of transfer to any address */ |
| switch (jk) { |
| case Ijk_EmFail: |
| case Ijk_EmWarn: |
| case Ijk_NoDecode: |
| case Ijk_TInval: |
| case Ijk_Sys_syscall: |
| case Ijk_ClientReq: |
| case Ijk_NoRedir: |
| case Ijk_Yield: |
| case Ijk_SigTRAP: { |
| HReg dst = s390_isel_int_expr(env, next); |
| addInstr(env, s390_insn_xassisted(S390_CC_ALWAYS, dst, guest_IA, jk)); |
| return; |
| } |
| default: |
| break; |
| } |
| |
| vpanic("iselNext"); |
| } |
| |
| |
| /*---------------------------------------------------------*/ |
| /*--- Insn selector top-level ---*/ |
| /*---------------------------------------------------------*/ |
| |
| /* Translate an entire SB to s390 code. |
| Note: archinfo_host is a pointer to a stack-allocated variable. |
| Do not assign it to a global variable! */ |
| |
| HInstrArray * |
| iselSB_S390(IRSB *bb, VexArch arch_host, VexArchInfo *archinfo_host, |
| VexAbiInfo *vbi, Int offset_host_evcheck_counter, |
| Int offset_host_evcheck_fail_addr, Bool chaining_allowed, |
| Bool add_profinc, Addr64 max_ga) |
| { |
| UInt i, j; |
| HReg hreg, hregHI; |
| ISelEnv *env; |
| UInt hwcaps_host = archinfo_host->hwcaps; |
| |
| /* KLUDGE: export hwcaps. */ |
| s390_host_hwcaps = hwcaps_host; |
| |
| /* Do some sanity checks */ |
| vassert((VEX_HWCAPS_S390X(hwcaps_host) & ~(VEX_HWCAPS_S390X_ALL)) == 0); |
| |
| /* Make up an initial environment to use. */ |
| env = LibVEX_Alloc(sizeof(ISelEnv)); |
| env->vreg_ctr = 0; |
| |
| /* Set up output code array. */ |
| env->code = newHInstrArray(); |
| |
| /* Copy BB's type env. */ |
| env->type_env = bb->tyenv; |
| |
| /* Set up data structures for tracking guest register values. */ |
| env->first_IA_assignment = True; |
| for (i = 0; i < NUM_TRACKED_REGS; ++i) { |
| env->old_value[i] = 0; /* just something to have a defined value */ |
| env->old_value_valid[i] = False; |
| } |
| |
| /* Make up an IRTemp -> virtual HReg mapping. This doesn't |
| change as we go along. For some reason types_used has Int type -- but |
| it should be unsigned. Internally we use an unsigned type; so we |
| assert it here. */ |
| vassert(bb->tyenv->types_used >= 0); |
| |
| env->n_vregmap = bb->tyenv->types_used; |
| env->vregmap = LibVEX_Alloc(env->n_vregmap * sizeof(HReg)); |
| env->vregmapHI = LibVEX_Alloc(env->n_vregmap * sizeof(HReg)); |
| |
| /* and finally ... */ |
| env->hwcaps = hwcaps_host; |
| |
| env->max_ga = max_ga; |
| env->chaining_allowed = chaining_allowed; |
| |
| /* For each IR temporary, allocate a suitably-kinded virtual |
| register. */ |
| j = 0; |
| for (i = 0; i < env->n_vregmap; i++) { |
| hregHI = hreg = INVALID_HREG; |
| switch (bb->tyenv->types[i]) { |
| case Ity_I1: |
| case Ity_I8: |
| case Ity_I16: |
| case Ity_I32: |
| hreg = mkHReg(j++, HRcInt64, True); |
| break; |
| |
| case Ity_I64: |
| hreg = mkHReg(j++, HRcInt64, True); |
| break; |
| |
| case Ity_I128: |
| hreg = mkHReg(j++, HRcInt64, True); |
| hregHI = mkHReg(j++, HRcInt64, True); |
| break; |
| |
| case Ity_F32: |
| case Ity_F64: |
| hreg = mkHReg(j++, HRcFlt64, True); |
| break; |
| |
| case Ity_F128: |
| hreg = mkHReg(j++, HRcFlt64, True); |
| hregHI = mkHReg(j++, HRcFlt64, True); |
| break; |
| |
| case Ity_V128: /* fall through */ |
| default: |
| ppIRType(bb->tyenv->types[i]); |
| vpanic("s390_isel_sb: IRTemp type"); |
| } |
| |
| env->vregmap[i] = hreg; |
| env->vregmapHI[i] = hregHI; |
| } |
| env->vreg_ctr = j; |
| |
| /* The very first instruction must be an event check. */ |
| s390_amode *counter, *fail_addr; |
| counter = s390_amode_for_guest_state(offset_host_evcheck_counter); |
| fail_addr = s390_amode_for_guest_state(offset_host_evcheck_fail_addr); |
| addInstr(env, s390_insn_evcheck(counter, fail_addr)); |
| |
| /* Possibly a block counter increment (for profiling). At this |
| point we don't know the address of the counter, so just pretend |
| it is zero. It will have to be patched later, but before this |
| translation is used, by a call to LibVEX_patchProfInc. */ |
| if (add_profinc) { |
| addInstr(env, s390_insn_profinc()); |
| } |
| |
| /* Ok, finally we can iterate over the statements. */ |
| for (i = 0; i < bb->stmts_used; i++) |
| if (bb->stmts[i]) |
| s390_isel_stmt(env, bb->stmts[i]); |
| |
| iselNext(env, bb->next, bb->jumpkind, bb->offsIP); |
| |
| /* Record the number of vregs we used. */ |
| env->code->n_vregs = env->vreg_ctr; |
| |
| return env->code; |
| } |
| |
| /*---------------------------------------------------------------*/ |
| /*--- end host_s390_isel.c ---*/ |
| /*---------------------------------------------------------------*/ |