[POWERPC] Check that the syscall table matches the syscall numbers

Also check that __NR_syscalls has been updated appropriately.

Hopefully this will catch any out of order additions to the
table in the future.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

3 files changed, 101 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 9374bc9a2dd1..d9b377070caa 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -91,3 +91,13 @@ obj-$(CONFIG_PPC64)		+= $(obj64-y)
 
 extra-$(CONFIG_PPC_FPU)         += fpu.o
 extra-$(CONFIG_PPC64)           += entry_64.o
+
+extra-y                         += systbl_chk.i
+$(obj)/systbl.o:                systbl_chk
+
+quiet_cmd_systbl_chk = CALL    $<
+      cmd_systbl_chk = $(CONFIG_SHELL) $< $(obj)/systbl_chk.i
+
+PHONY += systbl_chk
+systbl_chk: $(src)/systbl_chk.sh $(obj)/systbl_chk.i
+        $(call cmd,systbl_chk)
diff --git a/arch/powerpc/kernel/systbl_chk.c b/arch/powerpc/kernel/systbl_chk.c
new file mode 100644
index 000000000000..77824d1cb150
--- /dev/null
+++ b/arch/powerpc/kernel/systbl_chk.c
@@ -0,0 +1,58 @@
+/*
+ * This file, when run through CPP produces a list of syscall numbers
+ * in the order of systbl.h.  That way we can check for gaps and syscalls
+ * that are out of order.
+ *
+ * Unfortunately, we cannot check for the correct ordering of entries
+ * using SYSX().
+ *
+ * Copyright © IBM Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <asm/unistd.h>
+
+#define SYSCALL(func)           __NR_##func
+#define COMPAT_SYS(func)        __NR_##func
+#define PPC_SYS(func)           __NR_##func
+#ifdef CONFIG_PPC64
+#define OLDSYS(func)            -1
+#define SYS32ONLY(func)         -1
+#else
+#define OLDSYS(func)            __NR_old##func
+#define SYS32ONLY(func)         __NR_##func
+#endif
+#define SYSX(f, f3264, f32)     -1
+
+#define SYSCALL_SPU(func)       SYSCALL(func)
+#define COMPAT_SYS_SPU(func)    COMPAT_SYS(func)
+#define PPC_SYS_SPU(func)       PPC_SYS(func)
+#define SYSX_SPU(f, f3264, f32) SYSX(f, f3264, f32)
+
+/* Just insert a marker for ni_syscalls */
+#define __NR_ni_syscall         -1
+
+/*
+ * These are the known exceptions.
+ * Hopefully, there will be no more.
+ */
+#define __NR_llseek             __NR__llseek
+#undef  __NR_umount
+#define __NR_umount             __NR_umount2
+#define __NR_old_getrlimit      __NR_getrlimit
+#define __NR_newstat            __NR_stat
+#define __NR_newlstat           __NR_lstat
+#define __NR_newfstat           __NR_fstat
+#define __NR_newuname           __NR_uname
+#define __NR_sysctl             __NR__sysctl
+#define __NR_olddebug_setcontext        __NR_sys_debug_setcontext
+
+/* We call sys_ugetrlimit for syscall number __NR_getrlimit */
+#define getrlimit               ugetrlimit
+
+START_TABLE
+#include <asm/systbl.h>
+END_TABLE __NR_syscalls
diff --git a/arch/powerpc/kernel/systbl_chk.sh b/arch/powerpc/kernel/systbl_chk.sh
new file mode 100644
index 000000000000..367d208301d2
--- /dev/null
+++ b/arch/powerpc/kernel/systbl_chk.sh
@@ -0,0 +1,33 @@
+#!/bin/sh
+#
+# Just process the CPP output from systbl_chk.c and complain
+# if anything is out of order.
+#
+# Copyright © 2008 IBM Corporation
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version
+# 2 of the License, or (at your option) any later version.
+
+awk     'BEGIN { num = -1; }    # Ignore the beginning of the file
+        /^#/ { next; }
+        /^[ \t]*$/ { next; }
+        /^START_TABLE/ { num = 0; next; }
+        /^END_TABLE/ {
+                if (num != $2) {
+                        printf "__NR_syscalls (%s) is not one more than the last syscall (%s)\n",
+                                $2, num - 1;
+                        exit(1);
+                }
+                num = -1;       # Ignore the rest of the file
+        }
+        {
+                if (num == -1) next;
+                if (($1 != -1) && ($1 != num)) {
+                        printf "Syscall %s out of order (expected %s)\n",
+                                $1, num;
+                        exit(1);
+                };
+                num++;
+        }' "$1"