From 46d6137f01d7321172f00f4ae3f697018739396d Mon Sep 17 00:00:00 2001
From: Andreas Sandberg <andreas.sandberg@arm.com>
Date: Wed, 9 Jan 2019 15:52:51 +0000
Subject: arch-arm, sim-se: Fix incorrect SP handling in clone

The clone syscall is currently broken on aarch64 since the aarch64
code uses an incorrect SP register. Fix this by storing the new stack
pointer in SP_EL0 instead of R13.

Change-Id: Ie17990b4f359608e3b53e5bf625eca53769a6653
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Cc: Giacomo Travaglini <giacomo.travaglini@arm.com>
Cc: Javier Setoain <javier.setoain@arm.com>
Cc: Brandon Potter <Brandon.Potter@amd.com>
Reviewed-on: https://gem5-review.googlesource.com/c/15436
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Brandon Potter <Brandon.Potter@amd.com>
---
 src/arch/arm/linux/linux.hh | 26 +++++++++++++++++++++++---
 1 file changed, 23 insertions(+), 3 deletions(-)

diff --git a/src/arch/arm/linux/linux.hh b/src/arch/arm/linux/linux.hh
index 9e9ca1f80..e1f27a761 100644
--- a/src/arch/arm/linux/linux.hh
+++ b/src/arch/arm/linux/linux.hh
@@ -58,9 +58,6 @@ class ArmLinux : public Linux
               uint64_t stack, uint64_t tls)
     {
         ArmISA::copyRegs(ptc, ctc);
-
-        if (stack)
-            ctc->setIntReg(TheISA::StackPointerReg, stack);
     }
 };
 
@@ -271,6 +268,18 @@ class ArmLinux32 : public ArmLinux
         int32_t tms_cutime;     //!< user time of children
         int32_t tms_cstime;     //!< system time of children
     };
+
+    static void
+    archClone(uint64_t flags,
+              Process *pp, Process *cp,
+              ThreadContext *ptc, ThreadContext *ctc,
+              uint64_t stack, uint64_t tls)
+    {
+        ArmLinux::archClone(flags, pp, cp, ptc, ctc, stack, tls);
+
+        if (stack)
+            ctc->setIntReg(ArmISA::INTREG_SP, stack);
+    }
 };
 
 class ArmLinux64 : public ArmLinux
@@ -516,6 +525,17 @@ class ArmLinux64 : public ArmLinux
         int64_t tms_cutime;     //!< user time of children
         int64_t tms_cstime;     //!< system time of children
     };
+
+    static void archClone(uint64_t flags,
+                          Process *pp, Process *cp,
+                          ThreadContext *ptc, ThreadContext *ctc,
+                          uint64_t stack, uint64_t tls)
+    {
+        ArmLinux::archClone(flags, pp, cp, ptc, ctc, stack, tls);
+
+        if (stack)
+            ctc->setIntReg(ArmISA::INTREG_SP0, stack);
+    }
 };
 
 #endif
-- 
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