* Eric W. Biederman <[email protected]>: > Setting si_code to __SI_FAULT results in a userspace seeing > an si_code of 0. This is the same si_code as SI_USER. Posix > and common sense requires that SI_USER not be a signal specific > si_code. As such this use of 0 for the si_code is a pretty > horribly broken ABI. > > Given that alpha is on it's last legs I don't know that it is worth > fixing this, but it is worth documenting what is going on so that > no one decides to copy this bad decision.
The ABI was already broken, so IMHO I think it's better to somehow "fix" it instead. Agreed, alpha and some other architectures are already aged, but nevertheless most of them build in debian-ports. Below is a suggested fix which reuses/misuses other existing trap codes instead. Helge Signed-off-by: Helge Deller <[email protected]> diff --git a/arch/alpha/kernel/traps.c b/arch/alpha/kernel/traps.c index 65bb102..2ed37dd 100644 --- a/arch/alpha/kernel/traps.c +++ b/arch/alpha/kernel/traps.c @@ -278,7 +278,7 @@ do_entIF(unsigned long type, struct pt_regs *regs) case 1: /* bugcheck */ info.si_signo = SIGTRAP; info.si_errno = 0; - info.si_code = __SI_FAULT; + info.si_code = TRAP_HWBKPT; info.si_addr = (void __user *) regs->pc; info.si_trapno = 0; send_sig_info(SIGTRAP, &info, current); @@ -318,7 +318,7 @@ do_entIF(unsigned long type, struct pt_regs *regs) break; case GEN_ROPRAND: signo = SIGFPE; - code = __SI_FAULT; + code = FPE_FLTSUB; break; case GEN_DECOVF: @@ -340,7 +340,7 @@ do_entIF(unsigned long type, struct pt_regs *regs) case GEN_SUBRNG7: default: signo = SIGTRAP; - code = __SI_FAULT; + code = TRAP_HWBKPT; break; }
