Messages in this thread Patch in this message | | | From | Pratyush Anand <> | Subject | [RFC 7/8] ARM64: Handle TRAP_BRKPT for user mode as well | Date | Wed, 31 Dec 2014 20:51:23 +0530 |
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uprobe is registered at break_hook with a unique ESR code. So, when a TRAP_BRKPT occurs, call_break_hook checks if it was for uprobe. If not, then send a SIGTRAP to user.
Signed-off-by: Pratyush Anand <panand@redhat.com> --- arch/arm64/kernel/debug-monitors.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/kernel/debug-monitors.c b/arch/arm64/kernel/debug-monitors.c index 2676b8655241..98ba5c8c5141 100644 --- a/arch/arm64/kernel/debug-monitors.c +++ b/arch/arm64/kernel/debug-monitors.c @@ -306,6 +306,9 @@ static int brk_handler(unsigned long addr, unsigned int esr, { siginfo_t info; + if (call_break_hook(regs, esr) == DBG_HOOK_HANDLED) + return 0; + if (user_mode(regs)) { info = (siginfo_t) { .si_signo = SIGTRAP, @@ -315,12 +318,11 @@ static int brk_handler(unsigned long addr, unsigned int esr, }; force_sig_info(SIGTRAP, &info, current); - } else if (call_break_hook(regs, esr) != DBG_HOOK_HANDLED) { + return 0; + } else { pr_warning("Unexpected kernel BRK exception at EL1\n"); return -EFAULT; } - - return 0; } int aarch32_break_handler(struct pt_regs *regs) -- 2.1.0
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