MIPS: Fix syscall_get_nr for the syscall exit tracing.
Register 2 is alredy overwritten by the return value when syscall_trace_leave() is called. Signed-off-by: Lars Persson <larper@axis.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9187/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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3 changed files with 4 additions and 7 deletions
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@ -29,13 +29,7 @@
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static inline long syscall_get_nr(struct task_struct *task,
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struct pt_regs *regs)
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{
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/* O32 ABI syscall() - Either 64-bit with O32 or 32-bit */
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if ((config_enabled(CONFIG_32BIT) ||
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test_tsk_thread_flag(task, TIF_32BIT_REGS)) &&
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(regs->regs[2] == __NR_syscall))
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return regs->regs[4];
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else
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return regs->regs[2];
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return current_thread_info()->syscall;
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}
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static inline unsigned long mips_get_syscall_arg(unsigned long *arg,
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@ -36,6 +36,7 @@ struct thread_info {
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*/
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struct restart_block restart_block;
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struct pt_regs *regs;
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long syscall; /* syscall number */
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};
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/*
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@ -770,6 +770,8 @@ asmlinkage long syscall_trace_enter(struct pt_regs *regs, long syscall)
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long ret = 0;
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user_exit();
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current_thread_info()->syscall = syscall;
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if (secure_computing() == -1)
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return -1;
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