From: Guo Ren Date: Wed, 20 Mar 2019 10:27:27 +0000 (+0800) Subject: csky: Update syscall_trace_enter/exit implementation X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=2f7932b011e7fb9f98732f95a68f6017d4d8c542;p=openwrt%2Fstaging%2Fblogic.git 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 Cc: Dmitry V. Levin Cc: Arnd Bergmann --- diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig index 60ebaa325584..c4974cf6a222 100644 --- a/arch/csky/Kconfig +++ b/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 diff --git a/arch/csky/abiv1/inc/abi/entry.h b/arch/csky/abiv1/inc/abi/entry.h index 3f3faab3d747..7dacce4c0f15 100644 --- a/arch/csky/abiv1/inc/abi/entry.h +++ b/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 */ diff --git a/arch/csky/abiv2/inc/abi/entry.h b/arch/csky/abiv2/inc/abi/entry.h index edc5cc04c4de..ea376ed716c4 100644 --- a/arch/csky/abiv2/inc/abi/entry.h +++ b/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 */ diff --git a/arch/csky/include/asm/syscall.h b/arch/csky/include/asm/syscall.h index bda0a446c63e..850b694a463e 100644 --- a/arch/csky/include/asm/syscall.h +++ b/arch/csky/include/asm/syscall.h @@ -8,6 +8,8 @@ #include #include +extern void *sys_call_table[]; + static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs) { diff --git a/arch/csky/include/asm/thread_info.h b/arch/csky/include/asm/thread_info.h index 0e9d035d712b..0b546a55a8bf 100644 --- a/arch/csky/include/asm/thread_info.h +++ b/arch/csky/include/asm/thread_info.h @@ -51,29 +51,26 @@ 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 */ -#define _TIF_SIGPENDING (1 << TIF_SIGPENDING) -#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_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG) +#define _TIF_SIGPENDING (1 << TIF_SIGPENDING) +#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_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) +#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK) +#define _TIF_SECCOMP (1 << TIF_SECCOMP) #endif /* _ASM_CSKY_THREAD_INFO_H */ diff --git a/arch/csky/include/asm/unistd.h b/arch/csky/include/asm/unistd.h index 284487477a61..da7a18295615 100644 --- a/arch/csky/include/asm/unistd.h +++ b/arch/csky/include/asm/unistd.h @@ -2,3 +2,5 @@ // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. #include + +#define NR_syscalls (__NR_syscalls) diff --git a/arch/csky/include/uapi/asm/ptrace.h b/arch/csky/include/uapi/asm/ptrace.h index a4eaa8ddf0b1..9bf5b1a415d0 100644 --- a/arch/csky/include/uapi/asm/ptrace.h +++ b/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 */ diff --git a/arch/csky/kernel/entry.S b/arch/csky/kernel/entry.S index 5137ed9062bd..ecc6e7d2e95d 100644 --- a/arch/csky/kernel/entry.S +++ b/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 diff --git a/arch/csky/kernel/ptrace.c b/arch/csky/kernel/ptrace.c index f2f12fff36f7..91bc74bb569f 100644 --- a/arch/csky/kernel/ptrace.c +++ b/arch/csky/kernel/ptrace.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 // Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. +#include #include #include #include @@ -11,6 +12,7 @@ #include #include #include +#include #include #include @@ -22,6 +24,9 @@ #include +#define CREATE_TRACE_POINTS +#include + /* 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; - - ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) - ? 0x80 : 0)); - - /* - * 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; - } + if (test_thread_flag(TIF_SYSCALL_TRACE)) + tracehook_report_syscall_entry(regs); + + if (test_thread_flag(TIF_SYSCALL_TRACEPOINT)) + trace_sys_enter(regs, syscall_get_nr(current, regs)); + + 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);