From 0b68475b102a9ecc769d1a3493a34055e08c2e7e Mon Sep 17 00:00:00 2001
From: Tony Gutierrez <anthony.gutierrez@amd.com>
Date: Thu, 4 Aug 2016 12:32:21 -0400
Subject: x86, sim: add some syscalls to X86

this patch adds an implementation for the pwrite64 syscall and
enables it for x86_64, and enables fstatfs for x86_64.
---
 src/arch/x86/linux/process.cc |  4 ++--
 src/sim/syscall_emul.hh       | 22 ++++++++++++++++++++++
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/src/arch/x86/linux/process.cc b/src/arch/x86/linux/process.cc
index 665815c30..08137b943 100644
--- a/src/arch/x86/linux/process.cc
+++ b/src/arch/x86/linux/process.cc
@@ -236,7 +236,7 @@ static SyscallDesc syscallDescs64[] = {
     /*  15 */ SyscallDesc("rt_sigreturn", unimplementedFunc),
     /*  16 */ SyscallDesc("ioctl", ioctlFunc<X86Linux64>),
     /*  17 */ SyscallDesc("pread64", unimplementedFunc),
-    /*  18 */ SyscallDesc("pwrite64", unimplementedFunc),
+    /*  18 */ SyscallDesc("pwrite64", pwrite64Func<X86Linux64>),
     /*  19 */ SyscallDesc("readv", unimplementedFunc),
     /*  20 */ SyscallDesc("writev", writevFunc<X86Linux64>),
     /*  21 */ SyscallDesc("access", ignoreFunc),
@@ -356,7 +356,7 @@ static SyscallDesc syscallDescs64[] = {
     /* 135 */ SyscallDesc("personality", unimplementedFunc),
     /* 136 */ SyscallDesc("ustat", unimplementedFunc),
     /* 137 */ SyscallDesc("statfs", unimplementedFunc),
-    /* 138 */ SyscallDesc("fstatfs", unimplementedFunc),
+    /* 138 */ SyscallDesc("fstatfs", fstatfsFunc<X86Linux64>),
     /* 139 */ SyscallDesc("sysfs", unimplementedFunc),
     /* 140 */ SyscallDesc("getpriority", unimplementedFunc),
     /* 141 */ SyscallDesc("setpriority", unimplementedFunc),
diff --git a/src/sim/syscall_emul.hh b/src/sim/syscall_emul.hh
index e9ed130f0..906a01edb 100644
--- a/src/sim/syscall_emul.hh
+++ b/src/sim/syscall_emul.hh
@@ -1389,6 +1389,28 @@ mmapImpl(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc,
     return start;
 }
 
+template <class OS>
+SyscallReturn
+pwrite64Func(SyscallDesc *desc, int num, LiveProcess *p, ThreadContext *tc)
+{
+    int index = 0;
+    int tgt_fd = p->getSyscallArg(tc, index);
+    Addr bufPtr = p->getSyscallArg(tc, index);
+    int nbytes = p->getSyscallArg(tc, index);
+    int offset = p->getSyscallArg(tc, index);
+
+    int sim_fd = p->getSimFD(tgt_fd);
+    if (sim_fd < 0)
+        return -EBADF;
+
+    BufferArg bufArg(bufPtr, nbytes);
+    bufArg.copyIn(tc->getMemProxy());
+
+    int bytes_written = pwrite64(sim_fd, bufArg.bufferPtr(), nbytes, offset);
+
+    return (bytes_written == -1) ? -errno : bytes_written;
+}
+
 /// Target mmap() handler.
 template <class OS>
 SyscallReturn
-- 
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