csky: Update syscall_trace_enter/exit implementation

Previous syscall_trace implementation couldn't support AUDITSYSCALL and
SYSCALL_TRACEPOINTS. Now we redesign it to support audit_syscall
and syscall_tracepoints just like other archs'.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Dmitry V. Levin <ldv@altlinux.org>
Cc: Arnd Bergmann <arnd@arndb.de>

arch/csky/Kconfig

@@ -29,6 +29,7 @@ config CSKY
 	select GENERIC_SCHED_CLOCK
 	select GENERIC_SMP_IDLE_THREAD
 	select HAVE_ARCH_TRACEHOOK
+	select HAVE_ARCH_AUDITSYSCALL
 	select HAVE_DYNAMIC_FTRACE
 	select HAVE_FUNCTION_TRACER
 	select HAVE_FUNCTION_GRAPH_TRACER
@@ -39,6 +40,7 @@ config CSKY
 	select HAVE_PERF_EVENTS
 	select HAVE_DMA_API_DEBUG
 	select HAVE_DMA_CONTIGUOUS
+	select HAVE_SYSCALL_TRACEPOINTS
 	select MAY_HAVE_SPARSE_IRQ
 	select MODULES_USE_ELF_RELA if MODULES
 	select OF

arch/csky/abiv1/inc/abi/entry.h

@@ -157,4 +157,8 @@
 	cpwcr	\rx, cpcr31
 .endm
 
+.macro ANDI_R3 rx, imm
+	lsri	\rx, 3
+	andi	\rx, (\imm >> 3)
+.endm
 #endif /* __ASM_CSKY_ENTRY_H */

arch/csky/abiv2/inc/abi/entry.h

@@ -175,4 +175,9 @@
 	lrw	\rx, (PHYS_OFFSET + 0x20000000) | 0xe
 	mtcr	\rx, cr<31, 15>
 .endm
+
+.macro ANDI_R3 rx, imm
+	lsri	\rx, 3
+	andi	\rx, (\imm >> 3)
+.endm
 #endif /* __ASM_CSKY_ENTRY_H */

arch/csky/include/asm/syscall.h

@@ -8,6 +8,8 @@
 #include <abi/regdef.h>
 #include <uapi/linux/audit.h>
 
+extern void *sys_call_table[];
+
 static inline int
 syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
 {

arch/csky/include/asm/thread_info.h

@@ -51,17 +51,14 @@ static inline struct thread_info *current_thread_info(void)
 
 #endif /* !__ASSEMBLY__ */
 
-/* entry.S relies on these definitions!
- * bits 0-5 are tested at every exception exit
- */
 #define TIF_SIGPENDING		0	/* signal pending */
 #define TIF_NOTIFY_RESUME	1       /* callback before returning to user */
 #define TIF_NEED_RESCHED	2	/* rescheduling necessary */
-#define TIF_SYSCALL_TRACE	5	/* syscall trace active */
-#define TIF_DELAYED_TRACE	14	/* single step a syscall */
+#define TIF_SYSCALL_TRACE	3	/* syscall trace active */
+#define TIF_SYSCALL_TRACEPOINT	4       /* syscall tracepoint instrumentation */
+#define TIF_SYSCALL_AUDIT	5	/* syscall auditing */
 #define TIF_POLLING_NRFLAG	16	/* poll_idle() is TIF_NEED_RESCHED */
 #define TIF_MEMDIE		18      /* is terminating due to OOM killer */
-#define TIF_FREEZE		19	/* thread is freezing for suspend */
 #define TIF_RESTORE_SIGMASK	20	/* restore signal mask in do_signal() */
 #define TIF_SECCOMP		21	/* secure computing */
 
@@ -69,10 +66,10 @@ static inline struct thread_info *current_thread_info(void)
 #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
 #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
 #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
-#define _TIF_DELAYED_TRACE	(1 << TIF_DELAYED_TRACE)
+#define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
+#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
 #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
 #define _TIF_MEMDIE		(1 << TIF_MEMDIE)
-#define _TIF_FREEZE             (1 << TIF_FREEZE)
 #define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
 #define _TIF_SECCOMP		(1 << TIF_SECCOMP)
 

arch/csky/include/asm/unistd.h

@@ -2,3 +2,5 @@
 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
 
 #include <uapi/asm/unistd.h>
+
+#define NR_syscalls (__NR_syscalls)

arch/csky/include/uapi/asm/ptrace.h

@@ -62,6 +62,11 @@ struct user_fp {
 #define instruction_pointer(regs) ((regs)->pc)
 #define profile_pc(regs) instruction_pointer(regs)
 
+static inline unsigned long regs_return_value(struct pt_regs *regs)
+{
+	return regs->a0;
+}
+
 #endif /* __KERNEL__ */
 #endif /* __ASSEMBLY__ */
 #endif /* _CSKY_PTRACE_H */

arch/csky/kernel/entry.S

@@ -136,8 +136,9 @@ ENTRY(csky_systemcall)
 	bmaski  r10, THREAD_SHIFT
 	andn    r9, r10
 	ldw     r8, (r9, TINFO_FLAGS)
-	btsti   r8, TIF_SYSCALL_TRACE
-	bt      1f
+	ANDI_R3	r8, (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT)
+	cmpnei	r8, 0
+	bt      csky_syscall_trace
 #if defined(__CSKYABIV2__)
 	subi    sp, 8
 	stw  	r5, (sp, 0x4)
@@ -150,10 +151,9 @@ ENTRY(csky_systemcall)
 	stw     a0, (sp, LSAVE_A0)      /* Save return value */
 	jmpi    ret_from_exception
 
-1:
-	movi	a0, 0                   /* enter system call */
-	mov	a1, sp                  /* sp = pt_regs pointer */
-	jbsr	syscall_trace
+csky_syscall_trace:
+	mov	a0, sp                  /* sp = pt_regs pointer */
+	jbsr	syscall_trace_enter
 	/* Prepare args before do system call */
 	ldw	a0, (sp, LSAVE_A0)
 	ldw	a1, (sp, LSAVE_A1)
@@ -173,9 +173,8 @@ ENTRY(csky_systemcall)
 #endif
 	stw	a0, (sp, LSAVE_A0)	/* Save return value */
 
-	movi    a0, 1                   /* leave system call */
-	mov     a1, sp                  /* right now, sp --> pt_regs */
-	jbsr    syscall_trace
+	mov     a0, sp                  /* right now, sp --> pt_regs */
+	jbsr    syscall_trace_exit
 	br	ret_from_exception
 
 ENTRY(ret_from_kernel_thread)
@@ -191,11 +190,11 @@ ENTRY(ret_from_fork)
 	andn	r9, r10
 	ldw	r8, (r9, TINFO_FLAGS)
 	movi	r11_sig, 1
-	btsti	r8, TIF_SYSCALL_TRACE
+	ANDI_R3	r8, (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT)
+	cmpnei	r8, 0
 	bf	3f
-	movi	a0, 1
-	mov	a1, sp			/* sp = pt_regs pointer */
-	jbsr	syscall_trace
+	mov	a0, sp			/* sp = pt_regs pointer */
+	jbsr	syscall_trace_exit
 3:
 	jbsr	ret_from_exception
 

arch/csky/kernel/ptrace.c

 // SPDX-License-Identifier: GPL-2.0
 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
 
+#include <linux/audit.h>
 #include <linux/elf.h>
 #include <linux/errno.h>
 #include <linux/kernel.h>
@@ -11,6 +12,7 @@
 #include <linux/sched/task_stack.h>
 #include <linux/signal.h>
 #include <linux/smp.h>
+#include <linux/tracehook.h>
 #include <linux/uaccess.h>
 #include <linux/user.h>
 
@@ -22,6 +24,9 @@
 
 #include <abi/regdef.h>
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/syscalls.h>
+
 /* sets the trace bits. */
 #define TRACE_MODE_SI      (1 << 14)
 #define TRACE_MODE_RUN     0
@@ -207,35 +212,26 @@ long arch_ptrace(struct task_struct *child, long request,
 	return ret;
 }
 
-/*
- * If process's system calls is traces, do some corresponding handles in this
- * function before entering system call function and after exiting system call
- * function.
- */
-asmlinkage void syscall_trace(int why, struct pt_regs *regs)
+asmlinkage void syscall_trace_enter(struct pt_regs *regs)
 {
-	long saved_why;
-	/*
-	 * Save saved_why, why is used to denote syscall entry/exit;
-	 * why = 0:entry, why = 1: exit
-	 */
-	saved_why = regs->regs[SYSTRACE_SAVENUM];
-	regs->regs[SYSTRACE_SAVENUM] = why;
+	if (test_thread_flag(TIF_SYSCALL_TRACE))
+		tracehook_report_syscall_entry(regs);
 
-	ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD)
-					? 0x80 : 0));
+	if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
+		trace_sys_enter(regs, syscall_get_nr(current, regs));
 
-	/*
-	 * this isn't the same as continuing with a signal, but it will do
-	 * for normal use.  strace only continues with a signal if the
-	 * stopping signal is not SIGTRAP.  -brl
-	 */
-	if (current->exit_code) {
-		send_sig(current->exit_code, current, 1);
-		current->exit_code = 0;
-	}
+	audit_syscall_entry(regs_syscallid(regs), regs->a0, regs->a1, regs->a2, regs->a3);
+}
+
+asmlinkage void syscall_trace_exit(struct pt_regs *regs)
+{
+	audit_syscall_exit(regs);
+
+	if (test_thread_flag(TIF_SYSCALL_TRACE))
+		tracehook_report_syscall_exit(regs, 0);
 
-	regs->regs[SYSTRACE_SAVENUM] = saved_why;
+	if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
+		trace_sys_exit(regs, syscall_get_return_value(current, regs));
 }
 
 extern void show_stack(struct task_struct *task, unsigned long *stack);