mirror of https://github.com/xemu-project/xemu.git
bsd-user/signal.c: host_to_target_siginfo_noswap
Implement conversion of host to target siginfo. Signed-off-by: Stacey Son <sson@FreeBSD.org> Signed-off-by: Kyle Evans <kevans@freebsd.org> Signed-off-by: Warner Losh <imp@bsdimp.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Warner Losh
parent
6ddc1abe0f
commit
c34f2aaff6
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@ -48,6 +48,119 @@ int target_to_host_signal(int sig)
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return sig;
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return sig;
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}
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}
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static bool has_trapno(int tsig)
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{
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return tsig == TARGET_SIGILL ||
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tsig == TARGET_SIGFPE ||
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tsig == TARGET_SIGSEGV ||
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tsig == TARGET_SIGBUS ||
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tsig == TARGET_SIGTRAP;
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}
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/* Siginfo conversion. */
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/*
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* Populate tinfo w/o swapping based on guessing which fields are valid.
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*/
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static inline void host_to_target_siginfo_noswap(target_siginfo_t *tinfo,
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const siginfo_t *info)
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{
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int sig = host_to_target_signal(info->si_signo);
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int si_code = info->si_code;
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int si_type;
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/*
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* Make sure we that the variable portion of the target siginfo is zeroed
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* out so we don't leak anything into that.
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*/
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memset(&tinfo->_reason, 0, sizeof(tinfo->_reason));
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/*
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* This is awkward, because we have to use a combination of the si_code and
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* si_signo to figure out which of the union's members are valid.o We
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* therefore make our best guess.
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*
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* Once we have made our guess, we record it in the top 16 bits of
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* the si_code, so that tswap_siginfo() later can use it.
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* tswap_siginfo() will strip these top bits out before writing
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* si_code to the guest (sign-extending the lower bits).
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*/
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tinfo->si_signo = sig;
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tinfo->si_errno = info->si_errno;
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tinfo->si_code = info->si_code;
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tinfo->si_pid = info->si_pid;
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tinfo->si_uid = info->si_uid;
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tinfo->si_status = info->si_status;
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tinfo->si_addr = (abi_ulong)(unsigned long)info->si_addr;
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/*
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* si_value is opaque to kernel. On all FreeBSD platforms,
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* sizeof(sival_ptr) >= sizeof(sival_int) so the following
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* always will copy the larger element.
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*/
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tinfo->si_value.sival_ptr =
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(abi_ulong)(unsigned long)info->si_value.sival_ptr;
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switch (si_code) {
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/*
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* All the SI_xxx codes that are defined here are global to
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* all the signals (they have values that none of the other,
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* more specific signal info will set).
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*/
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case SI_USER:
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case SI_LWP:
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case SI_KERNEL:
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case SI_QUEUE:
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case SI_ASYNCIO:
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/*
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* Only the fixed parts are valid (though FreeBSD doesn't always
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* set all the fields to non-zero values.
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*/
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si_type = QEMU_SI_NOINFO;
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break;
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case SI_TIMER:
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tinfo->_reason._timer._timerid = info->_reason._timer._timerid;
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tinfo->_reason._timer._overrun = info->_reason._timer._overrun;
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si_type = QEMU_SI_TIMER;
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break;
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case SI_MESGQ:
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tinfo->_reason._mesgq._mqd = info->_reason._mesgq._mqd;
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si_type = QEMU_SI_MESGQ;
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break;
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default:
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/*
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* We have to go based on the signal number now to figure out
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* what's valid.
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*/
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if (has_trapno(sig)) {
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tinfo->_reason._fault._trapno = info->_reason._fault._trapno;
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si_type = QEMU_SI_FAULT;
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}
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#ifdef TARGET_SIGPOLL
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/*
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* FreeBSD never had SIGPOLL, but emulates it for Linux so there's
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* a chance it may popup in the future.
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*/
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if (sig == TARGET_SIGPOLL) {
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tinfo->_reason._poll._band = info->_reason._poll._band;
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si_type = QEMU_SI_POLL;
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}
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#endif
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/*
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* Unsure that this can actually be generated, and our support for
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* capsicum is somewhere between weak and non-existant, but if we get
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* one, then we know what to save.
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*/
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if (sig == TARGET_SIGTRAP) {
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tinfo->_reason._capsicum._syscall =
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info->_reason._capsicum._syscall;
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si_type = QEMU_SI_CAPSICUM;
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}
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break;
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}
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tinfo->si_code = deposit32(si_code, 24, 8, si_type);
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}
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/*
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/*
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* Queue a signal so that it will be send to the virtual CPU as soon as
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* Queue a signal so that it will be send to the virtual CPU as soon as
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* possible.
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* possible.
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