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authorGabe Black <gblack@eecs.umich.edu>2009-10-02 01:32:00 -0700
committerGabe Black <gblack@eecs.umich.edu>2009-10-02 01:32:00 -0700
commit86f3bec76d1bd14ed11188877dd3039d0bcfd489 (patch)
tree34f202e1c8637febb456ed2fe8a0899849f0b050 /src
parentf09f84da6ef01870991345539edae46b401cf311 (diff)
downloadgem5-86f3bec76d1bd14ed11188877dd3039d0bcfd489.tar.xz
SE mode: Make the direction anonymous mmaps move through memory configurable.
Diffstat (limited to 'src')
-rw-r--r--src/kern/operatingsystem.hh4
-rw-r--r--src/sim/syscall_emul.hh9
2 files changed, 11 insertions, 2 deletions
diff --git a/src/kern/operatingsystem.hh b/src/kern/operatingsystem.hh
index 47e64ffd9..6574e3c6b 100644
--- a/src/kern/operatingsystem.hh
+++ b/src/kern/operatingsystem.hh
@@ -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
diff --git a/src/sim/syscall_emul.hh b/src/sim/syscall_emul.hh
index c9ce4b14f..e45a6c797 100644
--- a/src/sim/syscall_emul.hh
+++ b/src/sim/syscall_emul.hh
@@ -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. "