From 4a752b1655c531a2fd7d98dbe24239fed5261291 Mon Sep 17 00:00:00 2001
From: Mitch Hayenga <mitch.hayenga+gem5@gmail.com>
Date: Tue, 8 Jan 2013 08:54:07 -0500
Subject: arm: add access syscall for ARM SE mode

This patch adds the "access" syscall for ARM SE as required by some spec2006
benchmarks.
---
 src/arch/arm/linux/process.cc |  2 +-
 src/sim/syscall_emul.cc       | 17 +++++++++++++++++
 src/sim/syscall_emul.hh       |  4 ++++
 3 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/arch/arm/linux/process.cc b/src/arch/arm/linux/process.cc
index 088f9907e..169565a04 100644
--- a/src/arch/arm/linux/process.cc
+++ b/src/arch/arm/linux/process.cc
@@ -108,7 +108,7 @@ SyscallDesc ArmLinuxProcess::syscallDescs[] = {
     /* 30 */ SyscallDesc("utime", unimplementedFunc),
     /* 31 */ SyscallDesc("unused#31", unimplementedFunc),
     /* 32 */ SyscallDesc("unused#32", unimplementedFunc),
-    /* 33 */ SyscallDesc("access", unimplementedFunc),
+    /* 33 */ SyscallDesc("access", accessFunc),
     /* 34 */ SyscallDesc("nice", unimplementedFunc),
     /* 35 */ SyscallDesc("unused#35", unimplementedFunc),
     /* 36 */ SyscallDesc("sync", unimplementedFunc),
diff --git a/src/sim/syscall_emul.cc b/src/sim/syscall_emul.cc
index 779e567f5..a86065317 100644
--- a/src/sim/syscall_emul.cc
+++ b/src/sim/syscall_emul.cc
@@ -851,3 +851,20 @@ cloneFunc(SyscallDesc *desc, int callnum, LiveProcess *process,
     }
 }
 
+SyscallReturn
+accessFunc(SyscallDesc *desc, int callnum, LiveProcess *p, ThreadContext *tc)
+{
+    int index = 0;
+
+    string path;
+    if (!tc->getMemProxy().tryReadString(path, p->getSyscallArg(tc, index)))
+        return (TheISA::IntReg)-EFAULT;
+
+    // Adjust path for current working directory
+    path = p->fullPath(path);
+
+    mode_t mode = p->getSyscallArg(tc, index);
+
+    int result = access(path.c_str(), mode);
+    return (result == -1) ? -errno : result;
+}
diff --git a/src/sim/syscall_emul.hh b/src/sim/syscall_emul.hh
index e98e771d5..364b66c0a 100644
--- a/src/sim/syscall_emul.hh
+++ b/src/sim/syscall_emul.hh
@@ -335,6 +335,10 @@ SyscallReturn getegidFunc(SyscallDesc *desc, int num,
 SyscallReturn cloneFunc(SyscallDesc *desc, int num,
                                LiveProcess *p, ThreadContext *tc);
 
+/// Target access() handler
+SyscallReturn accessFunc(SyscallDesc *desc, int num,
+                               LiveProcess *p, ThreadContext *tc);
+
 /// Futex system call
 ///  Implemented by Daniel Sanchez
 ///  Used by printf's in multi-threaded apps
-- 
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