Date: Thu, 14 May 2020 22:18:44 +0200 (CEST) From: Paul FLOYD <pjfloyd@wanadoo.fr> To: freebsd-hackers@freebsd.org Subject: SIGBUS si_code 12 Message-ID: <2102917207.11671.1589487524169.JavaMail.www@wwinf1n11>
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Hi It seems as though SIGBUS can have an si_code of 12. This isn't documented in the siginfo manpage (https://www.freebsd.org/cgi/man.cgi?query=siginfo&apropos=0&sektion=3&manpath=FreeBSD+12.1- RELEASE+and+Ports&arch=default&format=html). which only covers these 3 values for si_code. SIGBUS BUS_ADRALN invalid address alignment BUS_ADRERR nonexistent physical address BUS_OBJERR object-specific hardware error Is this a defect in the siginfo documentation? Here's an extract from trap.c that shows this. if (signo == SIGSEGV) { ucode = SEGV_MAPERR; } else if (prot_fault_translation == 0) { /* * Autodetect. This check also covers * the images without the ABI-tag ELF * note. */ if (SV_CURPROC_ABI() == SV_ABI_FREEBSD && p->p_osrel >= P_OSREL_SIGSEGV) { signo = SIGSEGV; ucode = SEGV_ACCERR; } else { signo = SIGBUS; ucode = T_PAGEFLT; } } else if (prot_fault_translation == 1) { /* * Always compat mode. */ signo = SIGBUS; ucode = T_PAGEFLT; } A+ Paul
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