linux-kernel - [RFC PATCH v1 10/16] powerpc/32: enter syscall with MSR

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Message-Id: <797c7cece5dbd61cbcd638beb65254b047dd028e.1549630193.git.christophe.leroy@c-s.fr>
Date:   Fri,  8 Feb 2019 12:52:37 +0000 (UTC)
From:   Christophe Leroy <christophe.leroy@....fr>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [RFC PATCH v1 10/16] powerpc/32: enter syscall with MSR_EE
 inconditionaly set

syscalls are expected to be entered with MSR_EE set. Lets
make it inconditional by forcing MSR_EE on syscalls.

This patch adds EXC_XFER_SYS for that.

Suggested-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
[splited out from benh RFC patch]

Signed-off-by: Christophe Leroy <christophe.leroy@....fr>
---
 arch/powerpc/kernel/head_32.S        | 2 +-
 arch/powerpc/kernel/head_32.h        | 4 ++++
 arch/powerpc/kernel/head_40x.S       | 2 +-
 arch/powerpc/kernel/head_44x.S       | 2 +-
 arch/powerpc/kernel/head_8xx.S       | 2 +-
 arch/powerpc/kernel/head_booke.h     | 4 ++++
 arch/powerpc/kernel/head_fsl_booke.S | 2 +-
 7 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index 9410e5490c33..33fb08b2398f 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -369,7 +369,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_FPU_UNAVAILABLE)
 	DO_KVM  0xc00
 SystemCall:
 	EXCEPTION_PROLOG
-	EXC_XFER_EE_LITE(0xc00, DoSyscall)
+	EXC_XFER_SYS(0xc00, DoSyscall)
 
 /* Single step - not used on 601 */
 	EXCEPTION(0xd00, SingleStep, single_step_exception, EXC_XFER_STD)
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index aa0131bb09b5..7221418a883f 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -123,6 +123,10 @@
 	EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, NOCOPY, transfer_to_handler, \
 			  ret_from_except)
 
+#define EXC_XFER_SYS(n, hdlr)		\
+	EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL | MSR_EE, NOCOPY, transfer_to_handler, \
+			  ret_from_except)
+
 #define EXC_XFER_EE(n, hdlr)		\
 	EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, COPY_EE, transfer_to_handler_full, \
 			  ret_from_except_full)
diff --git a/arch/powerpc/kernel/head_40x.S b/arch/powerpc/kernel/head_40x.S
index 3dc8a35849ff..ee6edf8a20c2 100644
--- a/arch/powerpc/kernel/head_40x.S
+++ b/arch/powerpc/kernel/head_40x.S
@@ -350,7 +350,7 @@ _ENTRY(saved_ksp_limit)
 /* 0x0C00 - System Call Exception */
 	START_EXCEPTION(0x0C00,	SystemCall)
 	EXCEPTION_PROLOG
-	EXC_XFER_EE_LITE(0xc00, DoSyscall)
+	EXC_XFER_SYS(0xc00, DoSyscall)
 
 	EXCEPTION(0x0D00, Trap_0D, unknown_exception, EXC_XFER_EE)
 	EXCEPTION(0x0E00, Trap_0E, unknown_exception, EXC_XFER_EE)
diff --git a/arch/powerpc/kernel/head_44x.S b/arch/powerpc/kernel/head_44x.S
index 37117ab11584..9cc01948651f 100644
--- a/arch/powerpc/kernel/head_44x.S
+++ b/arch/powerpc/kernel/head_44x.S
@@ -283,7 +283,7 @@ interrupt_base:
 	/* System Call Interrupt */
 	START_EXCEPTION(SystemCall)
 	NORMAL_EXCEPTION_PROLOG(BOOKE_INTERRUPT_SYSCALL)
-	EXC_XFER_EE_LITE(0x0c00, DoSyscall)
+	EXC_XFER_SYS(0x0c00, DoSyscall)
 
 	/* Auxiliary Processor Unavailable Interrupt */
 	EXCEPTION(0x2020, BOOKE_INTERRUPT_AP_UNAVAIL, \
diff --git a/arch/powerpc/kernel/head_8xx.S b/arch/powerpc/kernel/head_8xx.S
index 083f27f383b4..dfd5a8195e5e 100644
--- a/arch/powerpc/kernel/head_8xx.S
+++ b/arch/powerpc/kernel/head_8xx.S
@@ -186,7 +186,7 @@ Alignment:
 	. = 0xc00
 SystemCall:
 	EXCEPTION_PROLOG
-	EXC_XFER_EE_LITE(0xc00, DoSyscall)
+	EXC_XFER_SYS(0xc00, DoSyscall)
 
 /* Single step - not used on 601 */
 	EXCEPTION(0xd00, SingleStep, single_step_exception, EXC_XFER_STD)
diff --git a/arch/powerpc/kernel/head_booke.h b/arch/powerpc/kernel/head_booke.h
index 1b22a8dea399..612f54ba1125 100644
--- a/arch/powerpc/kernel/head_booke.h
+++ b/arch/powerpc/kernel/head_booke.h
@@ -251,6 +251,10 @@ END_BTB_FLUSH_SECTION
 	EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL, NOCOPY, transfer_to_handler, \
 			  ret_from_except)
 
+#define EXC_XFER_SYS(n, hdlr)						\
+	EXC_XFER_TEMPLATE(hdlr, n+1, MSR_KERNEL | MSR_EE, NOCOPY, transfer_to_handler, \
+			  ret_from_except)
+
 #define EXC_XFER_EE(n, hdlr)		\
 	EXC_XFER_TEMPLATE(hdlr, n, MSR_KERNEL, COPY_EE, transfer_to_handler_full, \
 			  ret_from_except_full)
diff --git a/arch/powerpc/kernel/head_fsl_booke.S b/arch/powerpc/kernel/head_fsl_booke.S
index 1881127682e9..89f36623993d 100644
--- a/arch/powerpc/kernel/head_fsl_booke.S
+++ b/arch/powerpc/kernel/head_fsl_booke.S
@@ -418,7 +418,7 @@ interrupt_base:
 	/* System Call Interrupt */
 	START_EXCEPTION(SystemCall)
 	NORMAL_EXCEPTION_PROLOG(SYSCALL)
-	EXC_XFER_EE_LITE(0x0c00, DoSyscall)
+	EXC_XFER_SYS(0x0c00, DoSyscall)
 
 	/* Auxiliary Processor Unavailable Interrupt */
 	EXCEPTION(0x2900, AP_UNAVAIL, AuxillaryProcessorUnavailable, \
-- 
2.13.3