by tip-bot2 for Alexey Makhalov

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Subject: [tip: x86/entry] x86/entry: Move max syscall number calculation to syscallhdr.sh

The following commit has been merged into the x86/entry branch of tip:

Commit-ID: 0872098804b5f44bab91f80b6df55df32894fee3
Gitweb: https://git.kernel.org/tip/0872098804b5f44bab91f80b6df55df32894fee3
Author: Brian Gerst <[email protected]>
AuthorDate: Fri, 13 Mar 2020 15:51:34 -04:00
Committer: Thomas Gleixner <[email protected]>
CommitterDate: Sat, 21 Mar 2020 16:03:21 +01:00

x86/entry: Move max syscall number calculation to syscallhdr.sh

Instead of using an array in asm-offsets to calculate the max syscall
number, calculate it when writing out the syscall headers.

Signed-off-by: Brian Gerst <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

---
arch/x86/entry/syscall_32.c | 6 +--
arch/x86/entry/syscall_64.c | 2 +-
arch/x86/entry/syscall_x32.c | 6 +--
arch/x86/entry/syscalls/syscallhdr.sh | 7 ++++-
arch/x86/entry/vdso/vdso32/vclock_gettime.c | 1 +-
arch/x86/include/asm/syscall.h | 3 +--
arch/x86/include/asm/unistd.h | 7 ++++-
arch/x86/kernel/asm-offsets_32.c | 9 +-----
arch/x86/kernel/asm-offsets_64.c | 36 +--------------------
arch/x86/um/sys_call_table_32.c | 2 +-
arch/x86/um/sys_call_table_64.c | 2 +-
arch/x86/um/user-offsets.c | 15 +--------
12 files changed, 24 insertions(+), 72 deletions(-)

diff --git a/arch/x86/entry/syscall_32.c b/arch/x86/entry/syscall_32.c
index 7d17b3a..3207cf6 100644
--- a/arch/x86/entry/syscall_32.c
+++ b/arch/x86/entry/syscall_32.c
@@ -4,7 +4,7 @@
#include <linux/linkage.h>
#include <linux/sys.h>
#include <linux/cache.h>
-#include <asm/asm-offsets.h>
+#include <asm/unistd.h>
#include <asm/syscall.h>

#ifdef CONFIG_IA32_EMULATION
@@ -22,11 +22,11 @@ extern asmlinkage long sys_ni_syscall(unsigned long, unsigned long, unsigned lon

#define __SYSCALL_I386(nr, sym, qual) [nr] = sym,

-__visible const sys_call_ptr_t ia32_sys_call_table[__NR_syscall_compat_max+1] = {
+__visible const sys_call_ptr_t ia32_sys_call_table[__NR_ia32_syscall_max+1] = {
/*
* Smells like a compiler bug -- it doesn't work
* when the & below is removed.
*/
- [0 ... __NR_syscall_compat_max] = &__sys_ni_syscall,
+ [0 ... __NR_ia32_syscall_max] = &__sys_ni_syscall,
#include <asm/syscalls_32.h>
};
diff --git a/arch/x86/entry/syscall_64.c b/arch/x86/entry/syscall_64.c
index efb85c6..5dc6846 100644
--- a/arch/x86/entry/syscall_64.c
+++ b/arch/x86/entry/syscall_64.c
@@ -5,7 +5,7 @@
#include <linux/sys.h>
#include <linux/cache.h>
#include <linux/syscalls.h>
-#include <asm/asm-offsets.h>
+#include <asm/unistd.h>
#include <asm/syscall.h>

#define __SYSCALL_X32(nr, sym, qual)
diff --git a/arch/x86/entry/syscall_x32.c b/arch/x86/entry/syscall_x32.c
index d144ced..95abb6d 100644
--- a/arch/x86/entry/syscall_x32.c
+++ b/arch/x86/entry/syscall_x32.c
@@ -5,7 +5,7 @@
#include <linux/sys.h>
#include <linux/cache.h>
#include <linux/syscalls.h>
-#include <asm/asm-offsets.h>
+#include <asm/unistd.h>
#include <asm/syscall.h>

#define __SYSCALL_64(nr, sym, qual)
@@ -16,11 +16,11 @@

#define __SYSCALL_X32(nr, sym, qual) [nr] = sym,

-asmlinkage const sys_call_ptr_t x32_sys_call_table[__NR_syscall_x32_max+1] = {
+asmlinkage const sys_call_ptr_t x32_sys_call_table[__NR_x32_syscall_max+1] = {
/*
* Smells like a compiler bug -- it doesn't work
* when the & below is removed.
*/
- [0 ... __NR_syscall_x32_max] = &__x64_sys_ni_syscall,
+ [0 ... __NR_x32_syscall_max] = &__x64_sys_ni_syscall,
#include <asm/syscalls_64.h>
};
diff --git a/arch/x86/entry/syscalls/syscallhdr.sh b/arch/x86/entry/syscalls/syscallhdr.sh
index 12fbbcf..cc1e638 100644
--- a/arch/x86/entry/syscalls/syscallhdr.sh
+++ b/arch/x86/entry/syscalls/syscallhdr.sh
@@ -15,14 +15,21 @@ grep -E "^[0-9A-Fa-fXx]+[[:space:]]+${my_abis}" "$in" | sort -n | (
echo "#define ${fileguard} 1"
echo ""

+ max=0
while read nr abi name entry ; do
if [ -z "$offset" ]; then
echo "#define __NR_${prefix}${name} $nr"
else
echo "#define __NR_${prefix}${name} ($offset + $nr)"
fi
+
+ max=$nr
done

echo ""
+ echo "#ifdef __KERNEL__"
+ echo "#define __NR_${prefix}syscall_max $max"
+ echo "#endif"
+ echo ""
echo "#endif /* ${fileguard} */"
) > "$out"
diff --git a/arch/x86/entry/vdso/vdso32/vclock_gettime.c b/arch/x86/entry/vdso/vdso32/vclock_gettime.c
index 9242b28..1e82bd4 100644
--- a/arch/x86/entry/vdso/vdso32/vclock_gettime.c
+++ b/arch/x86/entry/vdso/vdso32/vclock_gettime.c
@@ -13,6 +13,7 @@
*/
#undef CONFIG_64BIT
#undef CONFIG_X86_64
+#undef CONFIG_COMPAT
#undef CONFIG_PGTABLE_LEVELS
#undef CONFIG_ILLEGAL_POINTER_VALUE
#undef CONFIG_SPARSEMEM_VMEMMAP
diff --git a/arch/x86/include/asm/syscall.h b/arch/x86/include/asm/syscall.h
index 8db3fdb..1ef8d7b 100644
--- a/arch/x86/include/asm/syscall.h
+++ b/arch/x86/include/asm/syscall.h
@@ -13,7 +13,6 @@
#include <uapi/linux/audit.h>
#include <linux/sched.h>
#include <linux/err.h>
-#include <asm/asm-offsets.h> /* For NR_syscalls */
#include <asm/thread_info.h> /* for TS_COMPAT */
#include <asm/unistd.h>

@@ -28,8 +27,6 @@ extern const sys_call_ptr_t sys_call_table[];

#if defined(CONFIG_X86_32)
#define ia32_sys_call_table sys_call_table
-#define __NR_syscall_compat_max __NR_syscall_max
-#define IA32_NR_syscalls NR_syscalls
#endif

#if defined(CONFIG_IA32_EMULATION)
diff --git a/arch/x86/include/asm/unistd.h b/arch/x86/include/asm/unistd.h
index a7dd080..c1c3d31 100644
--- a/arch/x86/include/asm/unistd.h
+++ b/arch/x86/include/asm/unistd.h
@@ -13,10 +13,13 @@
# define __ARCH_WANT_SYS_OLD_MMAP
# define __ARCH_WANT_SYS_OLD_SELECT

+# define __NR_ia32_syscall_max __NR_syscall_max
+
# else

# include <asm/unistd_64.h>
# include <asm/unistd_64_x32.h>
+# include <asm/unistd_32_ia32.h>
# define __ARCH_WANT_SYS_TIME
# define __ARCH_WANT_SYS_UTIME
# define __ARCH_WANT_COMPAT_SYS_PREADV64
@@ -26,6 +29,10 @@

# endif

+# define NR_syscalls (__NR_syscall_max + 1)
+# define X32_NR_syscalls (__NR_x32_syscall_max + 1)
+# define IA32_NR_syscalls (__NR_ia32_syscall_max + 1)
+
# define __ARCH_WANT_NEW_STAT
# define __ARCH_WANT_OLD_READDIR
# define __ARCH_WANT_OLD_STAT
diff --git a/arch/x86/kernel/asm-offsets_32.c b/arch/x86/kernel/asm-offsets_32.c
index 82826f2..0dcac42 100644
--- a/arch/x86/kernel/asm-offsets_32.c
+++ b/arch/x86/kernel/asm-offsets_32.c
@@ -5,11 +5,6 @@

#include <asm/ucontext.h>

-#define __SYSCALL_I386(nr, sym, qual) [nr] = 1,
-static char syscalls[] = {
-#include <asm/syscalls_32.h>
-};
-
/* workaround for a warning with -Wmissing-prototypes */
void foo(void);

@@ -60,8 +55,4 @@ void foo(void)
BLANK();
OFFSET(stack_canary_offset, stack_canary, canary);
#endif
-
- BLANK();
- DEFINE(__NR_syscall_max, sizeof(syscalls) - 1);
- DEFINE(NR_syscalls, sizeof(syscalls));
}
diff --git a/arch/x86/kernel/asm-offsets_64.c b/arch/x86/kernel/asm-offsets_64.c
index 24d2fde..c2a4701 100644
--- a/arch/x86/kernel/asm-offsets_64.c
+++ b/arch/x86/kernel/asm-offsets_64.c
@@ -5,30 +5,6 @@

#include <asm/ia32.h>

-#define __SYSCALL_64(nr, sym, qual) [nr] = 1,
-#define __SYSCALL_X32(nr, sym, qual)
-static char syscalls_64[] = {
-#include <asm/syscalls_64.h>
-};
-#undef __SYSCALL_64
-#undef __SYSCALL_X32
-
-#ifdef CONFIG_X86_X32_ABI
-#define __SYSCALL_64(nr, sym, qual)
-#define __SYSCALL_X32(nr, sym, qual) [nr] = 1,
-static char syscalls_x32[] = {
-#include <asm/syscalls_64.h>
-};
-#undef __SYSCALL_64
-#undef __SYSCALL_X32
-#endif
-
-#define __SYSCALL_I386(nr, sym, qual) [nr] = 1,
-static char syscalls_ia32[] = {
-#include <asm/syscalls_32.h>
-};
-#undef __SYSCALL_I386
-
#if defined(CONFIG_KVM_GUEST) && defined(CONFIG_PARAVIRT_SPINLOCKS)
#include <asm/kvm_para.h>
#endif
@@ -90,17 +66,5 @@ int main(void)
DEFINE(stack_canary_offset, offsetof(struct fixed_percpu_data, stack_canary));
BLANK();
#endif
-
- DEFINE(__NR_syscall_max, sizeof(syscalls_64) - 1);
- DEFINE(NR_syscalls, sizeof(syscalls_64));
-
-#ifdef CONFIG_X86_X32_ABI
- DEFINE(__NR_syscall_x32_max, sizeof(syscalls_x32) - 1);
- DEFINE(X32_NR_syscalls, sizeof(syscalls_x32));
-#endif
-
- DEFINE(__NR_syscall_compat_max, sizeof(syscalls_ia32) - 1);
- DEFINE(IA32_NR_syscalls, sizeof(syscalls_ia32));
-
return 0;
}
diff --git a/arch/x86/um/sys_call_table_32.c b/arch/x86/um/sys_call_table_32.c
index 9649b5a..a0d75c5 100644
--- a/arch/x86/um/sys_call_table_32.c
+++ b/arch/x86/um/sys_call_table_32.c
@@ -7,7 +7,7 @@
#include <linux/linkage.h>
#include <linux/sys.h>
#include <linux/cache.h>
-#include <generated/user_constants.h>
+#include <asm/unistd.h>
#include <asm/syscall.h>

#define __NO_STUBS
diff --git a/arch/x86/um/sys_call_table_64.c b/arch/x86/um/sys_call_table_64.c
index c8bc7fb..fa97740 100644
--- a/arch/x86/um/sys_call_table_64.c
+++ b/arch/x86/um/sys_call_table_64.c
@@ -7,7 +7,7 @@
#include <linux/linkage.h>
#include <linux/sys.h>
#include <linux/cache.h>
-#include <generated/user_constants.h>
+#include <asm/unistd.h>
#include <asm/syscall.h>

#define __NO_STUBS
diff --git a/arch/x86/um/user-offsets.c b/arch/x86/um/user-offsets.c
index 5b37b7f..c51dd83 100644
--- a/arch/x86/um/user-offsets.c
+++ b/arch/x86/um/user-offsets.c
@@ -9,18 +9,6 @@
#include <linux/ptrace.h>
#include <asm/types.h>

-#ifdef __i386__
-#define __SYSCALL_I386(nr, sym, qual) [nr] = 1,
-static char syscalls[] = {
-#include <asm/syscalls_32.h>
-};
-#else
-#define __SYSCALL_64(nr, sym, qual) [nr] = 1,
-static char syscalls[] = {
-#include <asm/syscalls_64.h>
-};
-#endif
-
#define DEFINE(sym, val) \
asm volatile("\n->" #sym " %0 " #val : : "i" (val))

@@ -94,7 +82,4 @@ void foo(void)
DEFINE(UM_PROT_READ, PROT_READ);
DEFINE(UM_PROT_WRITE, PROT_WRITE);
DEFINE(UM_PROT_EXEC, PROT_EXEC);
-
- DEFINE(__NR_syscall_max, sizeof(syscalls) - 1);
- DEFINE(NR_syscalls, sizeof(syscalls));
}