csky/syscall_trace: Fixup return processing flow
The function tracehook_report_syscall_entry's return value is __must_check attribute. We should add return processing flow in ptrace.c and set the syscall number to -1 when failed just like riscv's. Signed-off-by: Guo Ren <ren_guo@c-sky.com> Cc: Arnd Bergmann <arnd@arndb.de>
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@ -16,6 +16,13 @@ syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
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return regs_syscallid(regs);
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return regs_syscallid(regs);
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}
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}
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static inline void
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syscall_set_nr(struct task_struct *task, struct pt_regs *regs,
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int sysno)
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{
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regs_syscallid(regs) = sysno;
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}
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static inline void
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static inline void
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syscall_rollback(struct task_struct *task, struct pt_regs *regs)
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syscall_rollback(struct task_struct *task, struct pt_regs *regs)
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{
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{
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@ -215,7 +215,8 @@ long arch_ptrace(struct task_struct *child, long request,
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asmlinkage void syscall_trace_enter(struct pt_regs *regs)
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asmlinkage void syscall_trace_enter(struct pt_regs *regs)
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{
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{
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if (test_thread_flag(TIF_SYSCALL_TRACE))
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if (test_thread_flag(TIF_SYSCALL_TRACE))
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tracehook_report_syscall_entry(regs);
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if (tracehook_report_syscall_entry(regs))
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syscall_set_nr(current, regs, -1);
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if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
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if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
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trace_sys_enter(regs, syscall_get_nr(current, regs));
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trace_sys_enter(regs, syscall_get_nr(current, regs));
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