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arm64: debug: report TRAP_TRACE instead of TRAP_HWBRPT for singlestep

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Single-step traps to userspace (e.g. via ptrace) are expected to use
the TRAP_TRACE for the si_code field of the siginfo, as opposed to
TRAP_HWBRPT that we report currently.

Fix the reported value, which has no effect on existing and legacy
builds of GDB.

Reported-by: Yao Qi <yao.qi@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2016-09-01 13:35:02 +01:00
parent a9be2ee093
commit adeb68ef85
1 changed files with 2 additions and 2 deletions
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4
arch/arm64/kernel/debug-monitors.c
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@ -236,7 +236,7 @@ static int single_step_handler(unsigned long addr, unsigned int esr,
return 0;
if (user_mode(regs)) {
send_user_sigtrap(TRAP_HWBKPT);
send_user_sigtrap(TRAP_TRACE);
/*
* ptrace will disable single step unless explicitly
@ -364,7 +364,7 @@ NOKPROBE_SYMBOL(aarch32_break_handler);
static int __init debug_traps_init(void)
{
hook_debug_fault_code(DBG_ESR_EVT_HWSS, single_step_handler, SIGTRAP,
TRAP_HWBKPT, "single-step handler");
TRAP_TRACE, "single-step handler");
hook_debug_fault_code(DBG_ESR_EVT_BRK, brk_handler, SIGTRAP,
TRAP_BRKPT, "ptrace BRK handler");
return 0;