memory.cxx

// clues
#include <clues/syscalls/memory.hxx>
 
namespace clues {
 
bool MmapSystemCall::implementsOldMmap() const {
        switch (abi()) {
                case ABI::I386: return true;
                default: return false;
        }
}
 
void MmapSystemCall::prepareNewSystemCall() {
        /*
         * setup parameters for legacy / new variant of mmap()
         */
        if (callNr() == SystemCallNr::MMAP2 || !implementsOldMmap()) {
                old_args.reset();
                setParameters(hint, length, protection, flags, fd, offset);
        } else {
                old_args.emplace(item::OldMmapArgs{});
                setParameters(*old_args);
        }
}
 
bool MmapSystemCall::check2ndPass(const Tracee &proc) {
        /*
         * we use this callback not for rearranging the parameters, but for
         * synchronizing the regular mmap arguments with the legacy struct
         * mmap data.
         */
        if (isOldMmap()) {
                const auto &args = *old_args;
                hint.fill(proc, Word{cosmos::to_integral(args.addr())});
                length.fill(proc, Word{args.length()});
                protection.fill(proc, Word{static_cast<elf_greg_t>(args.prot().raw())});
                flags.fill(proc, Word{static_cast<elf_greg_t>(cosmos::to_integral(args.type()) | args.flags().raw())});
                fd.fill(proc, Word{static_cast<elf_greg_t>(cosmos::to_integral(args.fd()))});
                offset.fill(proc, Word{args.offset()});
        }
        return false;
}
 
} // end ns