linux-kernel - [PATCH 4/6] powerpc/syscalls: Add COMPAT_SPU

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Date:   Wed,  2 May 2018 23:20:49 +1000
From:   Michael Ellerman <mpe@...erman.id.au>
To:     linuxppc-dev@...abs.org
Cc:     viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org
Subject: [PATCH 4/6] powerpc/syscalls: Add COMPAT_SPU_NEW() macro

Currently the select system call is wired up with the SYSX_SPU()
macro. The SYSX_SPU() is not handled by systbl_chk.c, which means the
syscall number for select is not checked.

That hides the fact that the syscall number for select is actually
__NR__newselect not __NR_select.

In a following patch we'd like to drop ppc32_select() which means
select will become a regular COMPAT_SYS_SPU() syscall. But
COMPAT_SYS_SPU() can't deal with the fact that the syscall number is
actually __NR__newselect. We also can't just redefine __NR_select
because that's still used for the old select call.

So add a new COMPAT_NEW_SPU() that does the same thing as
COMPAT_SYS_SPU() except it encodes that we're using the new number.

Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
---
 arch/powerpc/kernel/systbl.S                | 1 +
 arch/powerpc/kernel/systbl_chk.c            | 1 +
 arch/powerpc/platforms/cell/spu_callbacks.c | 1 +
 3 files changed, 3 insertions(+)

diff --git a/arch/powerpc/kernel/systbl.S b/arch/powerpc/kernel/systbl.S
index c7d5216d91d7..919a32746ede 100644
--- a/arch/powerpc/kernel/systbl.S
+++ b/arch/powerpc/kernel/systbl.S
@@ -35,6 +35,7 @@
 #endif
 #define SYSCALL_SPU(func)	SYSCALL(func)
 #define COMPAT_SYS_SPU(func)	COMPAT_SYS(func)
+#define COMPAT_SPU_NEW(func)	COMPAT_SYS(func)
 #define SYSX_SPU(f, f3264, f32)	SYSX(f, f3264, f32)
 
 .section .rodata,"a"
diff --git a/arch/powerpc/kernel/systbl_chk.c b/arch/powerpc/kernel/systbl_chk.c
index 28476e811644..4653258722ac 100644
--- a/arch/powerpc/kernel/systbl_chk.c
+++ b/arch/powerpc/kernel/systbl_chk.c
@@ -31,6 +31,7 @@
 
 #define SYSCALL_SPU(func)	SYSCALL(func)
 #define COMPAT_SYS_SPU(func)	COMPAT_SYS(func)
+#define COMPAT_SPU_NEW(func)	COMPAT_SYS(_new##func)
 #define SYSX_SPU(f, f3264, f32)	SYSX(f, f3264, f32)
 
 /* Just insert a marker for ni_syscalls */
diff --git a/arch/powerpc/platforms/cell/spu_callbacks.c b/arch/powerpc/platforms/cell/spu_callbacks.c
index d5bb8c8d769a..8ae86200ef6c 100644
--- a/arch/powerpc/platforms/cell/spu_callbacks.c
+++ b/arch/powerpc/platforms/cell/spu_callbacks.c
@@ -44,6 +44,7 @@ static void *spu_syscall_table[] = {
 
 #define SYSCALL_SPU(func)	sys_##func,
 #define COMPAT_SYS_SPU(func)	sys_##func,
+#define COMPAT_SPU_NEW(func)	sys_##func,
 #define SYSX_SPU(f, f3264, f32)	f,
 
 #include <asm/systbl.h>
-- 
2.14.1