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SE mode: Make the direction anonymous mmaps move through memory configurable.

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This commit is contained in:
Gabe Black 2009-10-02 01:32:00 -07:00
parent f09f84da6e
commit 86f3bec76d
2 changed files with 11 additions and 2 deletions
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4
src/kern/operatingsystem.hh
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@ -122,6 +122,10 @@ class OperatingSystem {
static int openSpecialFile(std::string path, LiveProcess *process, ThreadContext *tc);
static const bool mmapGrowsUp = true;
static bool mmapGrowsDown() { return false; }
}; // class OperatingSystem

9
src/sim/syscall_emul.hh
View file

@ -978,9 +978,14 @@ mmapFunc(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
}
// pick next address from our "mmap region"
start = p->mmap_end;
if (OS::mmapGrowsDown()) {
start = p->mmap_end - length;
p->mmap_end = start;
} else {
start = p->mmap_end;
p->mmap_end += length;
}
p->pTable->allocate(start, length);
p->mmap_end += length;
if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
warn("allowing mmap of file @ fd %d. "