diff options
| -rw-r--r-- | bsd-user/signal.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/bsd-user/signal.c b/bsd-user/signal.c index cb0036a..db8cf0a 100644 --- a/bsd-user/signal.c +++ b/bsd-user/signal.c @@ -48,6 +48,119 @@ int target_to_host_signal(int sig) return sig; } +static bool has_trapno(int tsig) +{ + return tsig == TARGET_SIGILL || + tsig == TARGET_SIGFPE || + tsig == TARGET_SIGSEGV || + tsig == TARGET_SIGBUS || + tsig == TARGET_SIGTRAP; +} + + +/* Siginfo conversion. */ + +/* + * Populate tinfo w/o swapping based on guessing which fields are valid. + */ +static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo, + const siginfo_t *info) +{ + int sig = host_to_target_signal(info->si_signo); + int si_code = info->si_code; + int si_type; + + /* + * Make sure we that the variable portion of the target siginfo is zeroed + * out so we don't leak anything into that. + */ + memset(&tinfo->_reason, 0, sizeof(tinfo->_reason)); + + /* + * This is awkward, because we have to use a combination of the si_code and + * si_signo to figure out which of the union's members are valid.o We + * therefore make our best guess. + * + * Once we have made our guess, we record it in the top 16 bits of + * the si_code, so that tswap_siginfo() later can use it. + * tswap_siginfo() will strip these top bits out before writing + * si_code to the guest (sign-extending the lower bits). + */ + tinfo->si_signo = sig; + tinfo->si_errno = info->si_errno; + tinfo->si_code = info->si_code; + tinfo->si_pid = info->si_pid; + tinfo->si_uid = info->si_uid; + tinfo->si_status = info->si_status; + tinfo->si_addr = (abi_ulong)(unsigned long)info->si_addr; + /* + * si_value is opaque to kernel. On all FreeBSD platforms, + * sizeof(sival_ptr) >= sizeof(sival_int) so the following + * always will copy the larger element. + */ + tinfo->si_value.sival_ptr = + (abi_ulong)(unsigned long)info->si_value.sival_ptr; + + switch (si_code) { + /* + * All the SI_xxx codes that are defined here are global to + * all the signals (they have values that none of the other, + * more specific signal info will set). + */ + case SI_USER: + case SI_LWP: + case SI_KERNEL: + case SI_QUEUE: + case SI_ASYNCIO: + /* + * Only the fixed parts are valid (though FreeBSD doesn't always + * set all the fields to non-zero values. + */ + si_type = QEMU_SI_NOINFO; + break; + case SI_TIMER: + tinfo->_reason._timer._timerid = info->_reason._timer._timerid; + tinfo->_reason._timer._overrun = info->_reason._timer._overrun; + si_type = QEMU_SI_TIMER; + break; + case SI_MESGQ: + tinfo->_reason._mesgq._mqd = info->_reason._mesgq._mqd; + si_type = QEMU_SI_MESGQ; + break; + default: + /* + * We have to go based on the signal number now to figure out + * what's valid. + */ + if (has_trapno(sig)) { + tinfo->_reason._fault._trapno = info->_reason._fault._trapno; + si_type = QEMU_SI_FAULT; + } +#ifdef TARGET_SIGPOLL + /* + * FreeBSD never had SIGPOLL, but emulates it for Linux so there's + * a chance it may popup in the future. + */ + if (sig == TARGET_SIGPOLL) { + tinfo->_reason._poll._band = info->_reason._poll._band; + si_type = QEMU_SI_POLL; + } +#endif + /* + * Unsure that this can actually be generated, and our support for + * capsicum is somewhere between weak and non-existant, but if we get + * one, then we know what to save. + */ + if (sig == TARGET_SIGTRAP) { + tinfo->_reason._capsicum._syscall = + info->_reason._capsicum._syscall; + si_type = QEMU_SI_CAPSICUM; + } + break; + } + tinfo->si_code = deposit32(si_code, 24, 8, si_type); +} + /* * Queue a signal so that it will be send to the virtual CPU as soon as * possible. |