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Clean up mmapFunc.

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sim/syscall_emul.hh:
    Clean up mmapFunc: args should be aligned and PageTable::allocate
    already handles multi-page allocations, so most of thw work done here
    was unnecessary (as far as I can tell).  I didn't test this beyond
    compiling though...

--HG--
extra : convert_revision : d79591a1cc58ea82ea911cc05e0970e81e1d2c60
This commit is contained in:
Steve Reinhardt 2006-04-10 20:02:36 -04:00
parent 59ab31cd80
commit cab1af2ee8
1 changed files with 16 additions and 13 deletions
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29
sim/syscall_emul.hh
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@ -700,22 +700,25 @@ mmapFunc(SyscallDesc *desc, int num, Process *p, ExecContext *xc)
int flags = xc->getSyscallArg(3);
// int fd = p->sim_fd(xc->getSyscallArg(4));
// int offset = xc->getSyscallArg(5);
Addr junk;
if (start == 0) {
// user didn't give an address... pick one from our "mmap region"
start = p->mmap_end;
for (ChunkGenerator gen(start, roundUp(length, TheISA::VMPageSize), TheISA::VMPageSize); !gen.done(); gen.next()) {
if (!p->pTable->translate(gen.addr(), junk))
p->pTable->allocate(roundDown(gen.addr(), TheISA::VMPageSize), TheISA::VMPageSize);
}
p->mmap_end += roundUp(length, TheISA::VMPageSize);
if (p->nxm_start != 0) {
//If we have an nxm space, make sure we haven't colided
assert(p->mmap_end < p->nxm_start);
}
if ((start % TheISA::VMPageSize) != 0 ||
(length % TheISA::VMPageSize) != 0) {
warn("mmap failing: arguments not page-aligned: "
"start 0x%x length 0x%x",
start, length);
return -EINVAL;
}
if (start != 0) {
warn("mmap: ignoring suggested map address 0x%x, using 0x%x",
start, p->mmap_end);
}
// pick next address from our "mmap region"
start = p->mmap_end;
p->pTable->allocate(start, length);
p->mmap_end += length;
if (!(flags & OS::TGT_MAP_ANONYMOUS)) {
warn("allowing mmap of file @ fd %d. "
"This will break if not /dev/zero.", xc->getSyscallArg(4));