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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>
hifive-unleashed-5.2
Guo Ren 2019-04-22 14:46:44 +08:00
parent 1a23710c71
commit a691f3334d
2 changed files with 9 additions and 1 deletions
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7
arch/csky/include/asm/syscall.h
View File

@ -16,6 +16,13 @@ syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
return regs_syscallid(regs);
}
static inline void
syscall_set_nr(struct task_struct *task, struct pt_regs *regs,
int sysno)
{
regs_syscallid(regs) = sysno;
}
static inline void
syscall_rollback(struct task_struct *task, struct pt_regs *regs)
{

3
arch/csky/kernel/ptrace.c
View File

@ -215,7 +215,8 @@ long arch_ptrace(struct task_struct *child, long request,
asmlinkage void syscall_trace_enter(struct pt_regs *regs)
{
if (test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall_entry(regs);
if (tracehook_report_syscall_entry(regs))
syscall_set_nr(current, regs, -1);
if (test_thread_flag(TIF_SYSCALL_TRACEPOINT))
trace_sys_enter(regs, syscall_get_nr(current, regs));