Hook up arch_prctl to call do_arch_prctl on x86-32, and in 32 bit compat
mode on x86-64. This allows us to have arch_prctls that are not specific to
64 bits.
On UML, simply stub out this syscall.
Signed-off-by: Kyle Huey <khuey@xxxxxxxxxxxx>
---
arch/x86/entry/syscalls/syscall_32.tbl | 1 +
arch/x86/kernel/process_32.c | 7 +++++++
arch/x86/kernel/process_64.c | 7 +++++++
arch/x86/um/Makefile | 2 +-
arch/x86/um/syscalls_32.c | 7 +++++++
include/linux/compat.h | 2 ++
6 files changed, 25 insertions(+), 1 deletion(-)
create mode 100644 arch/x86/um/syscalls_32.c
diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
index f848572..300fdf8 100644
--- a/arch/x86/entry/syscalls/syscall_32.tbl
+++ b/arch/x86/entry/syscalls/syscall_32.tbl
@@ -386,3 +386,4 @@
377 i386 copy_file_range sys_copy_file_range
378 i386 preadv2 sys_preadv2 compat_sys_preadv2
379 i386 pwritev2 sys_pwritev2 compat_sys_pwritev2
+380 i386 arch_prctl sys_arch_prctl compat_sys_arch_prctl
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index d86be29..71770a4 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -35,6 +35,7 @@
#include <linux/uaccess.h>
#include <linux/io.h>
#include <linux/kdebug.h>
+#include <linux/syscalls.h>
#include <asm/pgtable.h>
#include <asm/ldt.h>
@@ -54,6 +55,7 @@
#include <asm/debugreg.h>
#include <asm/switch_to.h>
#include <asm/vm86.h>
+#include <asm/proto.h>
asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
asmlinkage void ret_from_kernel_thread(void) __asm__("ret_from_kernel_thread");
@@ -316,3 +318,8 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
return prev_p;
}
+
+SYSCALL_DEFINE2(arch_prctl, int, code, unsigned long, arg2)
+{
+ return do_arch_prctl(current, code, arg2);
+}
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 5c60e2c..aa2b99a 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -599,6 +599,13 @@ SYSCALL_DEFINE2(arch_prctl, int, code, unsigned long, arg2)
return ret;
}
+#ifdef CONFIG_IA32_EMULATION
+COMPAT_SYSCALL_DEFINE2(arch_prctl, int, code, unsigned long, arg2)
+{
+ return do_arch_prctl(current, code, arg2);
+}
+#endif
+
unsigned long KSTK_ESP(struct task_struct *task)
{
return task_pt_regs(task)->sp;
diff --git a/arch/x86/um/Makefile b/arch/x86/um/Makefile
index 3ee2bb6..5e039d6 100644
--- a/arch/x86/um/Makefile
+++ b/arch/x86/um/Makefile
@@ -16,7 +16,7 @@ obj-y = bug.o bugs_$(BITS).o delay.o fault.o ksyms.o ldt.o \
ifeq ($(CONFIG_X86_32),y)
-obj-y += checksum_32.o
+obj-y += checksum_32.o syscalls_32.o
obj-$(CONFIG_ELF_CORE) += elfcore.o
subarch-y = ../lib/string_32.o ../lib/atomic64_32.o ../lib/atomic64_cx8_32.o
diff --git a/arch/x86/um/syscalls_32.c b/arch/x86/um/syscalls_32.c
new file mode 100644
index 0000000..ccf0598
--- /dev/null
+++ b/arch/x86/um/syscalls_32.c
@@ -0,0 +1,7 @@
+#include <linux/syscalls.h>
+#include <os.h>
+
+SYSCALL_DEFINE2(arch_prctl, int, code, unsigned long, arg2)
+{
+ return -EINVAL;
+}
diff --git a/include/linux/compat.h b/include/linux/compat.h
index f964ef7..0039d53 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -722,6 +722,8 @@ asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid,
asmlinkage long compat_sys_fanotify_mark(int, unsigned int, __u32, __u32,
int, const char __user *);
+asmlinkage long compat_sys_arch_prctl(int, unsigned long);
+
/*
* For most but not all architectures, "am I in a compat syscall?" and
* "am I a compat task?" are the same question. For architectures on which
--
2.9.3
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