/* -*- mode: C; c-basic-offset: 3; -*- */
/*---------------------------------------------------------------*/
/*--- begin ir_inject.c ---*/
/*---------------------------------------------------------------*/
/*
This file is part of Valgrind, a dynamic binary instrumentation
framework.
Copyright (C) 2012-2013 Florian Krohm (britzel@acm.org)
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.
*/
#include "libvex_basictypes.h"
#include "libvex_ir.h"
#include "libvex.h"
#include "main_util.h"
/* Convenience macros for readibility */
#define mkU8(v) IRExpr_Const(IRConst_U8(v))
#define mkU32(v) IRExpr_Const(IRConst_U32(v))
#define mkU64(v) IRExpr_Const(IRConst_U64(v))
#define unop(kind, a) IRExpr_Unop(kind, a)
#define binop(kind, a1, a2) IRExpr_Binop(kind, a1, a2)
#define triop(kind, a1, a2, a3) IRExpr_Triop(kind, a1, a2, a3)
#define qop(kind, a1, a2, a3, a4) IRExpr_Qop(kind, a1, a2, a3, a4)
#define stmt(irsb, st) addStmtToIRSB(irsb, st)
/* The IR Injection Control Block. vex_inject_ir will query its contents
to construct IR statements for testing purposes. */
static IRICB iricb;
void
LibVEX_InitIRI(const IRICB *iricb_in)
{
iricb = *iricb_in; // copy in
}
static IRExpr *
load_aux(IREndness endian, IRType type, IRExpr *addr)
{
if (type == Ity_D64) {
/* The insn selectors do not support loading a DFP value from memory.
So we need to fix it here by loading an integer value and
reinterpreting it as DFP. */
return unop(Iop_ReinterpI64asD64,
IRExpr_Load(endian, Ity_I64, addr));
}
if (type == Ity_I1) {
/* A Boolean value is stored as a 32-bit entity (see store_aux). */
return unop(Iop_32to1, IRExpr_Load(endian, Ity_I32, addr));
}
return IRExpr_Load(endian, type, addr);
}
/* Load a value from memory. Loads of more than 8 byte are split into
a series of 8-byte loads and combined using appropriate IROps. */
static IRExpr *
load(IREndness endian, IRType type, HWord haddr)
{
IROp concat;
IRExpr *addr, *next_addr;
vassert(type == Ity_I1 || sizeofIRType(type) <= 16);
if (VEX_HOST_WORDSIZE == 8) {
addr = mkU64(haddr);
next_addr = binop(Iop_Add64, addr, mkU64(8));
} else if (VEX_HOST_WORDSIZE == 4) {
addr = mkU32(haddr);
next_addr = binop(Iop_Add32, addr, mkU32(8));
} else {
vpanic("invalid #bytes for address");
}
switch (type) {
case Ity_I128: concat = Iop_64HLto128; type = Ity_I64; goto load128;
case Ity_F128: concat = Iop_F64HLtoF128; type = Ity_F64; goto load128;
case Ity_D128: concat = Iop_D64HLtoD128; type = Ity_D64; goto load128;
load128:
/* Two loads of 64 bit each. */
if (endian == Iend_BE) {
/* The more significant bits are at the lower address. */
return binop(concat,
load_aux(endian, type, addr),
load_aux(endian, type, next_addr));
} else {
/* The more significant bits are at the higher address. */
return binop(concat,
load_aux(endian, type, next_addr),
load_aux(endian, type, addr));
}
default:
return load_aux(endian, type, addr);
}
}
static void
store_aux(IRSB *irsb, IREndness endian, IRExpr *addr, IRExpr *data)
{
if (typeOfIRExpr(irsb->tyenv, data) == Ity_D64) {
/* The insn selectors do not support writing a DFP value to memory.
So we need to fix it here by reinterpreting the DFP value as an
integer and storing that. */
data = unop(Iop_ReinterpD64asI64, data);
}
if (typeOfIRExpr(irsb->tyenv, data) == Ity_I1) {
/* We cannot store a single bit. So we store it in a 32-bit container.
See also load_aux. */
data = unop(Iop_1Uto32, data);
}
stmt(irsb, IRStmt_Store(endian, addr, data));
}
/* Store a value to memory. If a value requires more than 8 bytes a series
of 8-byte stores will be generated. */
static __inline__ void
store(IRSB *irsb, IREndness endian, HWord haddr, IRExpr *data)
{
IROp high, low;
IRExpr *addr, *next_addr;
if (VEX_HOST_WORDSIZE == 8) {
addr = mkU64(haddr);
next_addr = binop(Iop_Add64, addr, mkU64(8));
} else if (VEX_HOST_WORDSIZE == 4) {
addr = mkU32(haddr);
next_addr = binop(Iop_Add32, addr, mkU32(8));
} else {
vpanic("invalid #bytes for address");
}
IRType type = typeOfIRExpr(irsb->tyenv, data);
vassert(type == Ity_I1 || sizeofIRType(type) <= 16);
switch (type) {
case Ity_I128: high = Iop_128HIto64; low = Iop_128to64; goto store128;
case Ity_F128: high = Iop_F128HItoF64; low = Iop_F128LOtoF64; goto store128;
case Ity_D128: high = Iop_D128HItoD64; low = Iop_D128LOtoD64; goto store128;
store128:
/* Two stores of 64 bit each. */
if (endian == Iend_BE) {
/* The more significant bits are at the lower address. */
store_aux(irsb, endian, addr, unop(high, data));
store_aux(irsb, endian, next_addr, unop(low, data));
} else {
/* The more significant bits are at the higher address. */
store_aux(irsb, endian, addr, unop(low, data));
store_aux(irsb, endian, next_addr, unop(high, data));
}
return;
default:
store_aux(irsb, endian, addr, data);
return;
}
}
/* Inject IR stmts depending on the data provided in the control
block iricb. */
void
vex_inject_ir(IRSB *irsb, IREndness endian)
{
IRExpr *data, *rounding_mode, *opnd1, *opnd2, *opnd3, *opnd4;
rounding_mode = NULL;
if (iricb.rounding_mode != NO_ROUNDING_MODE) {
rounding_mode = mkU32(iricb.rounding_mode);
}
switch (iricb.num_operands) {
case 1:
opnd1 = load(endian, iricb.t_opnd1, iricb.opnd1);
if (rounding_mode)
data = binop(iricb.op, rounding_mode, opnd1);
else
data = unop(iricb.op, opnd1);
break;
case 2:
opnd1 = load(endian, iricb.t_opnd1, iricb.opnd1);
if (iricb.shift_amount_is_immediate) {
// This implies that the IROp is a shift op
vassert(iricb.t_opnd2 == Ity_I8);
opnd2 = mkU8(*((Char *)iricb.opnd2));
} else {
opnd2 = load(endian, iricb.t_opnd2, iricb.opnd2);
}
if (rounding_mode)
data = triop(iricb.op, rounding_mode, opnd1, opnd2);
else
data = binop(iricb.op, opnd1, opnd2);
break;
case 3:
opnd1 = load(endian, iricb.t_opnd1, iricb.opnd1);
opnd2 = load(endian, iricb.t_opnd2, iricb.opnd2);
opnd3 = load(endian, iricb.t_opnd3, iricb.opnd3);
if (rounding_mode)
data = qop(iricb.op, rounding_mode, opnd1, opnd2, opnd3);
else
data = triop(iricb.op, opnd1, opnd2, opnd3);
break;
case 4:
vassert(rounding_mode == NULL);
opnd1 = load(endian, iricb.t_opnd1, iricb.opnd1);
opnd2 = load(endian, iricb.t_opnd2, iricb.opnd2);
opnd3 = load(endian, iricb.t_opnd3, iricb.opnd3);
opnd4 = load(endian, iricb.t_opnd4, iricb.opnd4);
data = qop(iricb.op, opnd1, opnd2, opnd3, opnd4);
break;
default:
vpanic("unsupported operator");
}
store(irsb, endian, iricb.result, data);
if (0) {
vex_printf("BEGIN inject\n");
if (iricb.t_result == Ity_I1 || sizeofIRType(iricb.t_result) <= 8) {
ppIRStmt(irsb->stmts[irsb->stmts_used - 1]);
} else if (sizeofIRType(iricb.t_result) == 16) {
ppIRStmt(irsb->stmts[irsb->stmts_used - 2]);
vex_printf("\n");
ppIRStmt(irsb->stmts[irsb->stmts_used - 1]);
}
vex_printf("\nEND inject\n");
}
}
/*---------------------------------------------------------------*/
/*--- end ir_inject.c ---*/
/*---------------------------------------------------------------*/