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-rw-r--r--arch/x86/entry/common.c13
-rw-r--r--arch/x86/entry/syscall_64.c25
-rw-r--r--arch/x86/entry/syscalls/syscalltbl.sh31
-rw-r--r--arch/x86/include/asm/syscall.h4
-rw-r--r--arch/x86/include/asm/unistd.h6
-rw-r--r--arch/x86/kernel/asm-offsets_64.c20
6 files changed, 73 insertions, 26 deletions
diff --git a/arch/x86/entry/common.c b/arch/x86/entry/common.c
index 536b574b6161..3f8e22615812 100644
--- a/arch/x86/entry/common.c
+++ b/arch/x86/entry/common.c
@@ -285,15 +285,16 @@ __visible void do_syscall_64(unsigned long nr, struct pt_regs *regs)
if (READ_ONCE(ti->flags) & _TIF_WORK_SYSCALL_ENTRY)
nr = syscall_trace_enter(regs);
- /*
- * NB: Native and x32 syscalls are dispatched from the same
- * table. The only functional difference is the x32 bit in
- * regs->orig_ax, which changes the behavior of some syscalls.
- */
- nr &= __SYSCALL_MASK;
if (likely(nr < NR_syscalls)) {
nr = array_index_nospec(nr, NR_syscalls);
regs->ax = sys_call_table[nr](regs);
+#ifdef CONFIG_X86_X32_ABI
+ } else if (likely((nr & __X32_SYSCALL_BIT) &&
+ (nr & ~__X32_SYSCALL_BIT) < X32_NR_syscalls)) {
+ nr = array_index_nospec(nr & ~__X32_SYSCALL_BIT,
+ X32_NR_syscalls);
+ regs->ax = x32_sys_call_table[nr](regs);
+#endif
}
syscall_return_slowpath(regs);
diff --git a/arch/x86/entry/syscall_64.c b/arch/x86/entry/syscall_64.c
index d5252bc1e380..b1bf31713374 100644
--- a/arch/x86/entry/syscall_64.c
+++ b/arch/x86/entry/syscall_64.c
@@ -10,10 +10,13 @@
/* this is a lie, but it does not hurt as sys_ni_syscall just returns -EINVAL */
extern asmlinkage long sys_ni_syscall(const struct pt_regs *);
#define __SYSCALL_64(nr, sym, qual) extern asmlinkage long sym(const struct pt_regs *);
+#define __SYSCALL_X32(nr, sym, qual) __SYSCALL_64(nr, sym, qual)
#include <asm/syscalls_64.h>
#undef __SYSCALL_64
+#undef __SYSCALL_X32
#define __SYSCALL_64(nr, sym, qual) [nr] = sym,
+#define __SYSCALL_X32(nr, sym, qual)
asmlinkage const sys_call_ptr_t sys_call_table[__NR_syscall_max+1] = {
/*
@@ -23,3 +26,25 @@ asmlinkage const sys_call_ptr_t sys_call_table[__NR_syscall_max+1] = {
[0 ... __NR_syscall_max] = &sys_ni_syscall,
#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] = sym,
+
+asmlinkage const sys_call_ptr_t x32_sys_call_table[__NR_syscall_x32_max+1] = {
+ /*
+ * Smells like a compiler bug -- it doesn't work
+ * when the & below is removed.
+ */
+ [0 ... __NR_syscall_x32_max] = &sys_ni_syscall,
+#include <asm/syscalls_64.h>
+};
+
+#undef __SYSCALL_64
+#undef __SYSCALL_X32
+
+#endif
diff --git a/arch/x86/entry/syscalls/syscalltbl.sh b/arch/x86/entry/syscalls/syscalltbl.sh
index 53c8c1a9adf9..1af2be39e7d9 100644
--- a/arch/x86/entry/syscalls/syscalltbl.sh
+++ b/arch/x86/entry/syscalls/syscalltbl.sh
@@ -1,13 +1,13 @@
-#!/bin/sh
+#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
in="$1"
out="$2"
syscall_macro() {
- abi="$1"
- nr="$2"
- entry="$3"
+ local abi="$1"
+ local nr="$2"
+ local entry="$3"
# Entry can be either just a function name or "function/qualifier"
real_entry="${entry%%/*}"
@@ -21,11 +21,11 @@ syscall_macro() {
}
emit() {
- abi="$1"
- nr="$2"
- entry="$3"
- compat="$4"
- umlentry=""
+ local abi="$1"
+ local nr="$2"
+ local entry="$3"
+ local compat="$4"
+ local umlentry=""
if [ "$abi" != "I386" -a -n "$compat" ]; then
echo "a compat entry ($abi: $compat) for a 64-bit syscall makes no sense" >&2
@@ -62,14 +62,17 @@ grep '^[0-9]' "$in" | sort -n | (
while read nr abi name entry compat; do
abi=`echo "$abi" | tr '[a-z]' '[A-Z]'`
if [ "$abi" = "COMMON" -o "$abi" = "64" ]; then
- # COMMON is the same as 64, except that we don't expect X32
- # programs to use it. Our expectation has nothing to do with
- # any generated code, so treat them the same.
emit 64 "$nr" "$entry" "$compat"
+ if [ "$abi" = "COMMON" ]; then
+ # COMMON means that this syscall exists in the same form for
+ # 64-bit and X32.
+ echo "#ifdef CONFIG_X86_X32_ABI"
+ emit X32 "$nr" "$entry" "$compat"
+ echo "#endif"
+ fi
elif [ "$abi" = "X32" ]; then
- # X32 is equivalent to 64 on an X32-compatible kernel.
echo "#ifdef CONFIG_X86_X32_ABI"
- emit 64 "$nr" "$entry" "$compat"
+ emit X32 "$nr" "$entry" "$compat"
echo "#endif"
elif [ "$abi" = "I386" ]; then
emit "$abi" "$nr" "$entry" "$compat"
diff --git a/arch/x86/include/asm/syscall.h b/arch/x86/include/asm/syscall.h
index 2dc4a021beea..8db3fdb6102e 100644
--- a/arch/x86/include/asm/syscall.h
+++ b/arch/x86/include/asm/syscall.h
@@ -36,6 +36,10 @@ extern const sys_call_ptr_t sys_call_table[];
extern const sys_call_ptr_t ia32_sys_call_table[];
#endif
+#ifdef CONFIG_X86_X32_ABI
+extern const sys_call_ptr_t x32_sys_call_table[];
+#endif
+
/*
* Only the low 32 bits of orig_ax are meaningful, so we return int.
* This importantly ignores the high bits on 64-bit, so comparisons
diff --git a/arch/x86/include/asm/unistd.h b/arch/x86/include/asm/unistd.h
index 097589753fec..a7dd080749ce 100644
--- a/arch/x86/include/asm/unistd.h
+++ b/arch/x86/include/asm/unistd.h
@@ -5,12 +5,6 @@
#include <uapi/asm/unistd.h>
-# ifdef CONFIG_X86_X32_ABI
-# define __SYSCALL_MASK (~(__X32_SYSCALL_BIT))
-# else
-# define __SYSCALL_MASK (~0)
-# endif
-
# ifdef CONFIG_X86_32
# include <asm/unistd_32.h>
diff --git a/arch/x86/kernel/asm-offsets_64.c b/arch/x86/kernel/asm-offsets_64.c
index d3d075226c0a..70e97727a26a 100644
--- a/arch/x86/kernel/asm-offsets_64.c
+++ b/arch/x86/kernel/asm-offsets_64.c
@@ -6,13 +6,28 @@
#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>
@@ -80,6 +95,11 @@ int main(void)
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));
generated by cgit v1.2.3 (git 2.39.0) at 2024-07-12 09:52:36 +0300