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authorAlec Roelke <ar4jc@virginia.edu>2017-10-28 11:54:48 -0400
committerAlec Roelke <ar4jc@virginia.edu>2017-11-06 19:06:06 +0000
commit7e02ab1dc622081a30e5b8bec3a944bd1fc7fca6 (patch)
tree2653fdde500754a04b4abb6ad5267f203f0abb63
parent8be75f49fd37712e7cf04c0853bb7504f69a04d6 (diff)
downloadgem5-7e02ab1dc622081a30e5b8bec3a944bd1fc7fca6.tar.xz
sim-se: Add prlimit system call
Some ISAs (namely RISC-V) implement getrlimit and setrlimit using prlimit. This patch adds an implementation for the prlimit system call. Normally prlimit is supposed to provide the functionality of both getrlimit and setrlimit, but because gem5 does not support setrlimit this implementation of prlimit will simply display a warning and return a failure code if the setrlimit mode is used. The same thing will happen if a pid other than 0 is passed to it. Change-Id: I653af2d5a60e716f4d6286196be7600409efcef8 Reviewed-on: https://gem5-review.googlesource.com/5321 Maintainer: Brandon Potter <Brandon.Potter@amd.com> Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
-rw-r--r--src/sim/syscall_emul.hh42
1 files changed, 42 insertions, 0 deletions
diff --git a/src/sim/syscall_emul.hh b/src/sim/syscall_emul.hh
index fa0959f0e..1b4580bbf 100644
--- a/src/sim/syscall_emul.hh
+++ b/src/sim/syscall_emul.hh
@@ -1687,6 +1687,48 @@ getrlimitFunc(SyscallDesc *desc, int callnum, Process *process,
return 0;
}
+template <class OS>
+SyscallReturn
+prlimitFunc(SyscallDesc *desc, int callnum, Process *process,
+ ThreadContext *tc)
+{
+ int index = 0;
+ if (process->getSyscallArg(tc, index) != 0)
+ {
+ warn("prlimit: ignoring rlimits for nonzero pid");
+ return -EPERM;
+ }
+ int resource = process->getSyscallArg(tc, index);
+ Addr n = process->getSyscallArg(tc, index);
+ if (n != 0)
+ warn("prlimit: ignoring new rlimit");
+ Addr o = process->getSyscallArg(tc, index);
+ if (o != 0)
+ {
+ TypedBufferArg<typename OS::rlimit> rlp(
+ process->getSyscallArg(tc, index));
+ switch (resource) {
+ case OS::TGT_RLIMIT_STACK:
+ // max stack size in bytes: make up a number (8MB for now)
+ rlp->rlim_cur = rlp->rlim_max = 8 * 1024 * 1024;
+ rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
+ rlp->rlim_max = TheISA::htog(rlp->rlim_max);
+ break;
+ case OS::TGT_RLIMIT_DATA:
+ // max data segment size in bytes: make up a number
+ rlp->rlim_cur = rlp->rlim_max = 256*1024*1024;
+ rlp->rlim_cur = TheISA::htog(rlp->rlim_cur);
+ rlp->rlim_max = TheISA::htog(rlp->rlim_max);
+ default:
+ warn("prlimit: unimplemented resource %d", resource);
+ return -EINVAL;
+ break;
+ }
+ rlp.copyOut(tc->getMemProxy());
+ }
+ return 0;
+}
+
/// Target clock_gettime() function.
template <class OS>
SyscallReturn