yetangitu/ghidra
1
0
Fork 0
mirror of https://github.com/NationalSecurityAgency/ghidra.git synced 2025-10-04 02:09:44 +02:00
Code Issues Releases Wiki Activity

convert splitVarnode to transferVarnodeProperties

Browse source
This commit is contained in:
caheckman 2019-10-08 09:31:40 -04:00
parent 873294d1d8
commit bb0feb3d62
2 changed files with 12 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

2
Ghidra/Features/Decompiler/src/decompile/cpp/funcdata.hh
View file

@ -352,7 +352,7 @@ public:
bool onlyOpUse(const Varnode *invn,const PcodeOp *opmatch,const ParamTrial &trial) const; bool onlyOpUse(const Varnode *invn,const PcodeOp *opmatch,const ParamTrial &trial) const;
bool ancestorOpUse(int4 maxlevel,const Varnode *invn,const PcodeOp *op,ParamTrial &trial) const; bool ancestorOpUse(int4 maxlevel,const Varnode *invn,const PcodeOp *op,ParamTrial &trial) const;
bool syncVarnodesWithSymbols(const ScopeLocal *lm,bool typesyes); bool syncVarnodesWithSymbols(const ScopeLocal *lm,bool typesyes);
void splitVarnode(Varnode *vn,int4 lowsize,Varnode *&vnlo,Varnode *& vnhi); void transferVarnodeProperties(Varnode *vn,Varnode *newVn,int4 lsbOffset);
bool fillinReadOnly(Varnode *vn); ///< Replace the given Varnode with its (constant) value in the load image bool fillinReadOnly(Varnode *vn); ///< Replace the given Varnode with its (constant) value in the load image
bool replaceVolatile(Varnode *vn); ///< Replace accesses of the given Varnode with \e volatile operations bool replaceVolatile(Varnode *vn); ///< Replace accesses of the given Varnode with \e volatile operations
void markIndirectOnly(void); ///< Mark \e illegal \e input Varnodes used only in INDIRECTs void markIndirectOnly(void); ///< Mark \e illegal \e input Varnodes used only in INDIRECTs

34
Ghidra/Features/Decompiler/src/decompile/cpp/funcdata_varnode.cc
View file

@ -479,34 +479,22 @@ void Funcdata::setHighLevel(void)
assignHigh(*iter); assignHigh(*iter);
} }
/// \brief Create two new Varnodes which split the given Varnode /// \brief Copy properties from an existing Varnode to a new Varnode
/// ///
/// Attributes are copied from the original into the split pieces if appropriate /// The new Varnode is assumed to overlap the storage of the existing Varnode.
/// \param vn is the given Varnode /// Properties like boolean flags and \e consume bits are copied as appropriate.
/// \param lowsize is the desired size in bytes of the least significant portion /// \param vn is the existing Varnode
/// \param vnlo will hold the least significant portion /// \param newVn is the new Varnode that has its properties set
/// \param vnhi will hold the most significant portion /// \param lsbOffset is the significance offset of the new Varnode within the exising
void Funcdata::splitVarnode(Varnode *vn,int4 lowsize,Varnode *& vnlo,Varnode *& vnhi) void Funcdata::transferVarnodeProperties(Varnode *vn,Varnode *newVn,int4 lsbOffset)
{ {
int4 highsize = vn->getSize() - lowsize; uintb newConsume = (vn->getConsume() >> 8*lsbOffset) & calc_mask(newVn->getSize());
Address addrhi = vn->getAddr();
Address addrlo = addrhi;
uintb consumehi = vn->getConsume() >> 8*lowsize;
uintb consumelo = vn->getConsume() & calc_mask(lowsize);
if (vn->getSpace()->isBigEndian())
addrlo = addrhi + highsize;
else
addrhi = addrhi + lowsize;
uint4 vnflags = vn->getFlags() & (Varnode::directwrite|Varnode::addrforce|Varnode::auto_live); uint4 vnFlags = vn->getFlags() & (Varnode::directwrite|Varnode::addrforce|Varnode::auto_live);
vnhi = newVarnode(highsize,addrhi);
vnlo = newVarnode(lowsize,addrlo);
vnhi->setFlags(vnflags); // Preserve addrforce setting newVn->setFlags(vnFlags); // Preserve addrforce setting
vnlo->setFlags(vnflags); newVn->setConsume(newConsume);
vnhi->setConsume(consumehi);
vnlo->setConsume(consumelo);
} }
/// Treat the given Varnode as read-only, look up its value in LoadImage /// Treat the given Varnode as read-only, look up its value in LoadImage