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arm64: Handle TRAP_TRACE for user mode as well
uprobe registers a handler at step_hook. So, single_step_handler now checks for user mode as well if there is a valid hook. Signed-off-by: Pratyush Anand <panand@redhat.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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@ -226,6 +226,8 @@ static void send_user_sigtrap(int si_code)
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static int single_step_handler(unsigned long addr, unsigned int esr,
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struct pt_regs *regs)
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{
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bool handler_found = false;
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/*
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* If we are stepping a pending breakpoint, call the hw_breakpoint
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* handler first.
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@ -233,7 +235,14 @@ static int single_step_handler(unsigned long addr, unsigned int esr,
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if (!reinstall_suspended_bps(regs))
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return 0;
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if (user_mode(regs)) {
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#ifdef CONFIG_KPROBES
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if (kprobe_single_step_handler(regs, esr) == DBG_HOOK_HANDLED)
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handler_found = true;
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#endif
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if (!handler_found && call_step_hook(regs, esr) == DBG_HOOK_HANDLED)
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handler_found = true;
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if (!handler_found && user_mode(regs)) {
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send_user_sigtrap(TRAP_TRACE);
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/*
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@ -243,15 +252,8 @@ static int single_step_handler(unsigned long addr, unsigned int esr,
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* to the active-not-pending state).
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*/
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user_rewind_single_step(current);
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} else {
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#ifdef CONFIG_KPROBES
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if (kprobe_single_step_handler(regs, esr) == DBG_HOOK_HANDLED)
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return 0;
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#endif
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if (call_step_hook(regs, esr) == DBG_HOOK_HANDLED)
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return 0;
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pr_warning("Unexpected kernel single-step exception at EL1\n");
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} else if (!handler_found) {
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pr_warn("Unexpected kernel single-step exception at EL1\n");
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/*
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* Re-enable stepping since we know that we will be
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* returning to regs.
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