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| author | Steve Reinhardt <steve.reinhardt@amd.com> | 2014-09-02 16:07:50 -0500 |
|---|---|---|
| committer | Steve Reinhardt <steve.reinhardt@amd.com> | 2014-09-02 16:07:50 -0500 |
| commit | 6ab4eddb9f5fbd30db0dccbef4a60c46b7053de3 (patch) | |
| tree | 475fdf0cb41ce8b1ec463509fa6527e6c4046932 /src/sim/syscall_emul.cc | |
| parent | 9ac7f14fc021075af458404096e76225b1ea59df (diff) | |
| download | gem5-6ab4eddb9f5fbd30db0dccbef4a60c46b7053de3.tar.xz | |
syscall_emul: add retry flag to SyscallReturn
This hook allows blocking emulated system calls to indicate
that they would block, but return control to the simulator
so that the simulation does not hang. The actual retry
functionality requires additional support, to be provided
in a future changeset.
Diffstat (limited to 'src/sim/syscall_emul.cc')
| -rw-r--r-- | src/sim/syscall_emul.cc | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/src/sim/syscall_emul.cc b/src/sim/syscall_emul.cc index d8df891dd..cb592e338 100644 --- a/src/sim/syscall_emul.cc +++ b/src/sim/syscall_emul.cc @@ -71,10 +71,15 @@ SyscallDesc::doSyscall(int callnum, LiveProcess *process, ThreadContext *tc) SyscallReturn retval = (*funcPtr)(this, callnum, process, tc); - DPRINTFR(SyscallVerbose, "%d: %s: syscall %s returns %d\n", - curTick(), tc->getCpuPtr()->name(), name, retval.encodedValue()); + if (retval.needsRetry()) { + DPRINTFS(SyscallVerbose, tc->getCpuPtr(), "syscall %s needs retry\n", + name); + } else { + DPRINTFS(SyscallVerbose, tc->getCpuPtr(), "syscall %s returns %d\n", + name, retval.encodedValue()); + } - if (!(flags & SyscallDesc::SuppressReturnValue)) + if (!(flags & SyscallDesc::SuppressReturnValue) && !retval.needsRetry()) process->setSyscallReturn(tc, retval); } |