diff options
Diffstat (limited to 'linux-user/signal.c')
| -rw-r--r-- | linux-user/signal.c | 211 |
1 files changed, 130 insertions, 81 deletions
diff --git a/linux-user/signal.c b/linux-user/signal.c index d3ac0e2..e4eea69 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -512,9 +512,43 @@ void signal_init(void) } } +#if !(defined(TARGET_X86_64) || defined(TARGET_UNICORE32)) +/* Force a synchronously taken signal. The kernel force_sig() function + * also forces the signal to "not blocked, not ignored", but for QEMU + * that work is done in process_pending_signals(). + */ +static void force_sig(int sig) +{ + CPUState *cpu = thread_cpu; + CPUArchState *env = cpu->env_ptr; + target_siginfo_t info; + + info.si_signo = sig; + info.si_errno = 0; + info.si_code = TARGET_SI_KERNEL; + info._sifields._kill._pid = 0; + info._sifields._kill._uid = 0; + queue_signal(env, info.si_signo, QEMU_SI_KILL, &info); +} + +/* Force a SIGSEGV if we couldn't write to memory trying to set + * up the signal frame. oldsig is the signal we were trying to handle + * at the point of failure. + */ +static void force_sigsegv(int oldsig) +{ + if (oldsig == SIGSEGV) { + /* Make sure we don't try to deliver the signal again; this will + * end up with handle_pending_signal() calling dump_core_and_abort(). + */ + sigact_table[oldsig - 1]._sa_handler = TARGET_SIG_DFL; + } + force_sig(TARGET_SIGSEGV); +} +#endif /* abort execution with signal */ -static void QEMU_NORETURN force_sig(int target_sig) +static void QEMU_NORETURN dump_core_and_abort(int target_sig) { CPUState *cpu = thread_cpu; CPUArchState *env = cpu->env_ptr; @@ -569,19 +603,15 @@ static void QEMU_NORETURN force_sig(int target_sig) /* queue a signal so that it will be send to the virtual CPU as soon as possible */ -int queue_signal(CPUArchState *env, int sig, target_siginfo_t *info) +int queue_signal(CPUArchState *env, int sig, int si_type, + target_siginfo_t *info) { CPUState *cpu = ENV_GET_CPU(env); TaskState *ts = cpu->opaque; trace_user_queue_signal(env, sig); - /* Currently all callers define siginfo structures which - * use the _sifields._sigfault union member, so we can - * set the type here. If that changes we should push this - * out so the si_type is passed in by callers. - */ - info->si_code = deposit32(info->si_code, 16, 16, QEMU_SI_FAULT); + info->si_code = deposit32(info->si_code, 16, 16, si_type); ts->sync_signal.info = *info; ts->sync_signal.pending = sig; @@ -1015,10 +1045,7 @@ static void setup_frame(int sig, struct target_sigaction *ka, return; give_sigsegv: - if (sig == TARGET_SIGSEGV) { - ka->_sa_handler = TARGET_SIG_DFL; - } - force_sig(TARGET_SIGSEGV /* , current */); + force_sigsegv(sig); } /* compare linux/arch/i386/kernel/signal.c:setup_rt_frame() */ @@ -1088,10 +1115,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka, return; give_sigsegv: - if (sig == TARGET_SIGSEGV) { - ka->_sa_handler = TARGET_SIG_DFL; - } - force_sig(TARGET_SIGSEGV /* , current */); + force_sigsegv(sig); } static int @@ -1165,7 +1189,7 @@ long do_sigreturn(CPUX86State *env) badframe: unlock_user_struct(frame, frame_addr, 0); force_sig(TARGET_SIGSEGV); - return 0; + return -TARGET_QEMU_ESIGRETURN; } long do_rt_sigreturn(CPUX86State *env) @@ -1196,7 +1220,7 @@ long do_rt_sigreturn(CPUX86State *env) badframe: unlock_user_struct(frame, frame_addr, 0); force_sig(TARGET_SIGSEGV); - return 0; + return -TARGET_QEMU_ESIGRETURN; } #elif defined(TARGET_AARCH64) @@ -1420,7 +1444,7 @@ static void target_setup_frame(int usig, struct target_sigaction *ka, give_sigsegv: unlock_user_struct(frame, frame_addr, 1); - force_sig(TARGET_SIGSEGV); + force_sigsegv(usig); } static void setup_rt_frame(int sig, struct target_sigaction *ka, @@ -1466,7 +1490,7 @@ long do_rt_sigreturn(CPUARMState *env) badframe: unlock_user_struct(frame, frame_addr, 0); force_sig(TARGET_SIGSEGV); - return 0; + return -TARGET_QEMU_ESIGRETURN; } long do_sigreturn(CPUARMState *env) @@ -1772,7 +1796,7 @@ static void setup_frame_v1(int usig, struct target_sigaction *ka, trace_user_setup_frame(regs, frame_addr); if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { - return; + goto sigsegv; } setup_sigcontext(&frame->sc, regs, set->sig[0]); @@ -1785,6 +1809,9 @@ static void setup_frame_v1(int usig, struct target_sigaction *ka, frame_addr + offsetof(struct sigframe_v1, retcode)); unlock_user_struct(frame, frame_addr, 1); + return; +sigsegv: + force_sigsegv(usig); } static void setup_frame_v2(int usig, struct target_sigaction *ka, @@ -1795,7 +1822,7 @@ static void setup_frame_v2(int usig, struct target_sigaction *ka, trace_user_setup_frame(regs, frame_addr); if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { - return; + goto sigsegv; } setup_sigframe_v2(&frame->uc, set, regs); @@ -1804,6 +1831,9 @@ static void setup_frame_v2(int usig, struct target_sigaction *ka, frame_addr + offsetof(struct sigframe_v2, retcode)); unlock_user_struct(frame, frame_addr, 1); + return; +sigsegv: + force_sigsegv(usig); } static void setup_frame(int usig, struct target_sigaction *ka, @@ -1829,7 +1859,7 @@ static void setup_rt_frame_v1(int usig, struct target_sigaction *ka, trace_user_setup_rt_frame(env, frame_addr); if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { - return /* 1 */; + goto sigsegv; } info_addr = frame_addr + offsetof(struct rt_sigframe_v1, info); @@ -1859,6 +1889,9 @@ static void setup_rt_frame_v1(int usig, struct target_sigaction *ka, env->regs[2] = uc_addr; unlock_user_struct(frame, frame_addr, 1); + return; +sigsegv: + force_sigsegv(usig); } static void setup_rt_frame_v2(int usig, struct target_sigaction *ka, @@ -1871,7 +1904,7 @@ static void setup_rt_frame_v2(int usig, struct target_sigaction *ka, trace_user_setup_rt_frame(env, frame_addr); if (!lock_user_struct(VERIFY_WRITE, frame, frame_addr, 0)) { - return /* 1 */; + goto sigsegv; } info_addr = frame_addr + offsetof(struct rt_sigframe_v2, info); @@ -1887,6 +1920,9 @@ static void setup_rt_frame_v2(int usig, struct target_sigaction *ka, env->regs[2] = uc_addr; unlock_user_struct(frame, frame_addr, 1); + return; +sigsegv: + force_sigsegv(usig); } static void setup_rt_frame(int usig, struct target_sigaction *ka, @@ -1976,8 +2012,8 @@ static long do_sigreturn_v1(CPUARMState *env) return -TARGET_QEMU_ESIGRETURN; badframe: - force_sig(TARGET_SIGSEGV /* , current */); - return 0; + force_sig(TARGET_SIGSEGV); + return -TARGET_QEMU_ESIGRETURN; } static abi_ulong *restore_sigframe_v2_vfp(CPUARMState *env, abi_ulong *regspace) @@ -2035,7 +2071,8 @@ static abi_ulong *restore_sigframe_v2_iwmmxt(CPUARMState *env, return (abi_ulong*)(iwmmxtframe + 1); } -static int do_sigframe_return_v2(CPUARMState *env, target_ulong frame_addr, +static int do_sigframe_return_v2(CPUARMState *env, + target_ulong context_addr, struct target_ucontext_v2 *uc) { sigset_t host_set; @@ -2062,8 +2099,11 @@ static int do_sigframe_return_v2(CPUARMState *env, target_ulong frame_addr, } } - if (do_sigaltstack(frame_addr + offsetof(struct target_ucontext_v2, tuc_stack), 0, get_sp_from_cpustate(env)) == -EFAULT) + if (do_sigaltstack(context_addr + + offsetof(struct target_ucontext_v2, tuc_stack), + 0, get_sp_from_cpustate(env)) == -EFAULT) { return 1; + } #if 0 /* Send SIGTRAP if we're single-stepping */ @@ -2094,7 +2134,10 @@ static long do_sigreturn_v2(CPUARMState *env) goto badframe; } - if (do_sigframe_return_v2(env, frame_addr, &frame->uc)) { + if (do_sigframe_return_v2(env, + frame_addr + + offsetof(struct sigframe_v2, uc), + &frame->uc)) { goto badframe; } @@ -2103,8 +2146,8 @@ static long do_sigreturn_v2(CPUARMState *env) badframe: unlock_user_struct(frame, frame_addr, 0); - force_sig(TARGET_SIGSEGV /* , current */); - return 0; + force_sig(TARGET_SIGSEGV); + return -TARGET_QEMU_ESIGRETURN; } long do_sigreturn(CPUARMState *env) @@ -2157,8 +2200,8 @@ static long do_rt_sigreturn_v1(CPUARMState *env) badframe: unlock_user_struct(frame, frame_addr, 0); - force_sig(TARGET_SIGSEGV /* , current */); - return 0; + force_sig(TARGET_SIGSEGV); + return -TARGET_QEMU_ESIGRETURN; } static long do_rt_sigreturn_v2(CPUARMState *env) @@ -2181,7 +2224,10 @@ static long do_rt_sigreturn_v2(CPUARMState *env) goto badframe; } - if (do_sigframe_return_v2(env, frame_addr, &frame->uc)) { + if (do_sigframe_return_v2(env, + frame_addr + + offsetof(struct rt_sigframe_v2, uc), + &frame->uc)) { goto badframe; } @@ -2190,8 +2236,8 @@ static long do_rt_sigreturn_v2(CPUARMState *env) badframe: unlock_user_struct(frame, frame_addr, 0); - force_sig(TARGET_SIGSEGV /* , current */); - return 0; + force_sig(TARGET_SIGSEGV); + return -TARGET_QEMU_ESIGRETURN; } long do_rt_sigreturn(CPUARMState *env) @@ -2445,7 +2491,7 @@ sigill_and_return: #endif sigsegv: unlock_user(sf, sf_addr, sizeof(struct target_signal_frame)); - force_sig(TARGET_SIGSEGV); + force_sigsegv(sig); } static void setup_rt_frame(int sig, struct target_sigaction *ka, @@ -2525,6 +2571,7 @@ long do_sigreturn(CPUSPARCState *env) segv_and_exit: unlock_user_struct(sf, sf_addr, 0); force_sig(TARGET_SIGSEGV); + return -TARGET_QEMU_ESIGRETURN; } long do_rt_sigreturn(CPUSPARCState *env) @@ -3037,7 +3084,7 @@ static void setup_frame(int sig, struct target_sigaction * ka, return; give_sigsegv: - force_sig(TARGET_SIGSEGV/*, current*/); + force_sigsegv(sig); } long do_sigreturn(CPUMIPSState *regs) @@ -3082,8 +3129,8 @@ long do_sigreturn(CPUMIPSState *regs) return -TARGET_QEMU_ESIGRETURN; badframe: - force_sig(TARGET_SIGSEGV/*, current*/); - return 0; + force_sig(TARGET_SIGSEGV); + return -TARGET_QEMU_ESIGRETURN; } # endif /* O32 */ @@ -3146,7 +3193,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka, give_sigsegv: unlock_user_struct(frame, frame_addr, 1); - force_sig(TARGET_SIGSEGV/*, current*/); + force_sigsegv(sig); } long do_rt_sigreturn(CPUMIPSState *env) @@ -3179,8 +3226,8 @@ long do_rt_sigreturn(CPUMIPSState *env) return -TARGET_QEMU_ESIGRETURN; badframe: - force_sig(TARGET_SIGSEGV/*, current*/); - return 0; + force_sig(TARGET_SIGSEGV); + return -TARGET_QEMU_ESIGRETURN; } #elif defined(TARGET_SH4) @@ -3349,7 +3396,7 @@ static void setup_frame(int sig, struct target_sigaction *ka, give_sigsegv: unlock_user_struct(frame, frame_addr, 1); - force_sig(TARGET_SIGSEGV); + force_sigsegv(sig); } static void setup_rt_frame(int sig, struct target_sigaction *ka, @@ -3409,7 +3456,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka, give_sigsegv: unlock_user_struct(frame, frame_addr, 1); - force_sig(TARGET_SIGSEGV); + force_sigsegv(sig); } long do_sigreturn(CPUSH4State *regs) @@ -3446,7 +3493,7 @@ long do_sigreturn(CPUSH4State *regs) badframe: unlock_user_struct(frame, frame_addr, 0); force_sig(TARGET_SIGSEGV); - return 0; + return -TARGET_QEMU_ESIGRETURN; } long do_rt_sigreturn(CPUSH4State *regs) @@ -3478,7 +3525,7 @@ long do_rt_sigreturn(CPUSH4State *regs) badframe: unlock_user_struct(frame, frame_addr, 0); force_sig(TARGET_SIGSEGV); - return 0; + return -TARGET_QEMU_ESIGRETURN; } #elif defined(TARGET_MICROBLAZE) @@ -3656,7 +3703,7 @@ static void setup_frame(int sig, struct target_sigaction *ka, unlock_user_struct(frame, frame_addr, 1); return; badframe: - force_sig(TARGET_SIGSEGV); + force_sigsegv(sig); } static void setup_rt_frame(int sig, struct target_sigaction *ka, @@ -3697,6 +3744,7 @@ long do_sigreturn(CPUMBState *env) return -TARGET_QEMU_ESIGRETURN; badframe: force_sig(TARGET_SIGSEGV); + return -TARGET_QEMU_ESIGRETURN; } long do_rt_sigreturn(CPUMBState *env) @@ -3826,7 +3874,7 @@ static void setup_frame(int sig, struct target_sigaction *ka, unlock_user_struct(frame, frame_addr, 1); return; badframe: - force_sig(TARGET_SIGSEGV); + force_sigsegv(sig); } static void setup_rt_frame(int sig, struct target_sigaction *ka, @@ -3864,6 +3912,7 @@ long do_sigreturn(CPUCRISState *env) return -TARGET_QEMU_ESIGRETURN; badframe: force_sig(TARGET_SIGSEGV); + return -TARGET_QEMU_ESIGRETURN; } long do_rt_sigreturn(CPUCRISState *env) @@ -4065,10 +4114,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka, give_sigsegv: unlock_user_struct(frame, frame_addr, 1); - if (sig == TARGET_SIGSEGV) { - ka->_sa_handler = TARGET_SIG_DFL; - } - force_sig(TARGET_SIGSEGV); + force_sigsegv(sig); } long do_sigreturn(CPUOpenRISCState *env) @@ -4249,7 +4295,7 @@ static void setup_frame(int sig, struct target_sigaction *ka, return; give_sigsegv: - force_sig(TARGET_SIGSEGV); + force_sigsegv(sig); } static void setup_rt_frame(int sig, struct target_sigaction *ka, @@ -4304,7 +4350,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka, return; give_sigsegv: - force_sig(TARGET_SIGSEGV); + force_sigsegv(sig); } static int @@ -4358,7 +4404,7 @@ long do_sigreturn(CPUS390XState *env) badframe: force_sig(TARGET_SIGSEGV); - return 0; + return -TARGET_QEMU_ESIGRETURN; } long do_rt_sigreturn(CPUS390XState *env) @@ -4389,7 +4435,7 @@ long do_rt_sigreturn(CPUS390XState *env) badframe: unlock_user_struct(frame, frame_addr, 0); force_sig(TARGET_SIGSEGV); - return 0; + return -TARGET_QEMU_ESIGRETURN; } #elif defined(TARGET_PPC) @@ -4815,7 +4861,7 @@ static void setup_frame(int sig, struct target_sigaction *ka, sigsegv: unlock_user_struct(frame, frame_addr, 1); - force_sig(TARGET_SIGSEGV); + force_sigsegv(sig); } static void setup_rt_frame(int sig, struct target_sigaction *ka, @@ -4910,7 +4956,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka, sigsegv: unlock_user_struct(rt_sf, rt_sf_addr, 1); - force_sig(TARGET_SIGSEGV); + force_sigsegv(sig); } @@ -4948,7 +4994,7 @@ sigsegv: unlock_user_struct(sr, sr_addr, 1); unlock_user_struct(sc, sc_addr, 1); force_sig(TARGET_SIGSEGV); - return 0; + return -TARGET_QEMU_ESIGRETURN; } /* See arch/powerpc/kernel/signal_32.c. */ @@ -5003,7 +5049,7 @@ long do_rt_sigreturn(CPUPPCState *env) sigsegv: unlock_user_struct(rt_sf, rt_sf_addr, 1); force_sig(TARGET_SIGSEGV); - return 0; + return -TARGET_QEMU_ESIGRETURN; } #elif defined(TARGET_M68K) @@ -5159,7 +5205,7 @@ static void setup_frame(int sig, struct target_sigaction *ka, return; give_sigsegv: - force_sig(TARGET_SIGSEGV); + force_sigsegv(sig); } static inline int target_rt_setup_ucontext(struct target_ucontext *uc, @@ -5298,7 +5344,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka, give_sigsegv: unlock_user_struct(frame, frame_addr, 1); - force_sig(TARGET_SIGSEGV); + force_sigsegv(sig); } long do_sigreturn(CPUM68KState *env) @@ -5333,7 +5379,7 @@ long do_sigreturn(CPUM68KState *env) badframe: force_sig(TARGET_SIGSEGV); - return 0; + return -TARGET_QEMU_ESIGRETURN; } long do_rt_sigreturn(CPUM68KState *env) @@ -5366,7 +5412,7 @@ long do_rt_sigreturn(CPUM68KState *env) badframe: unlock_user_struct(frame, frame_addr, 0); force_sig(TARGET_SIGSEGV); - return 0; + return -TARGET_QEMU_ESIGRETURN; } #elif defined(TARGET_ALPHA) @@ -5505,10 +5551,8 @@ static void setup_frame(int sig, struct target_sigaction *ka, if (err) { give_sigsegv: - if (sig == TARGET_SIGSEGV) { - ka->_sa_handler = TARGET_SIG_DFL; - } - force_sig(TARGET_SIGSEGV); + force_sigsegv(sig); + return; } env->ir[IR_RA] = r26; @@ -5562,10 +5606,8 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka, if (err) { give_sigsegv: - if (sig == TARGET_SIGSEGV) { - ka->_sa_handler = TARGET_SIG_DFL; - } - force_sig(TARGET_SIGSEGV); + force_sigsegv(sig); + return; } env->ir[IR_RA] = r26; @@ -5599,6 +5641,7 @@ long do_sigreturn(CPUAlphaState *env) badframe: force_sig(TARGET_SIGSEGV); + return -TARGET_QEMU_ESIGRETURN; } long do_rt_sigreturn(CPUAlphaState *env) @@ -5628,6 +5671,7 @@ long do_rt_sigreturn(CPUAlphaState *env) badframe: unlock_user_struct(frame, frame_addr, 0); force_sig(TARGET_SIGSEGV); + return -TARGET_QEMU_ESIGRETURN; } #elif defined(TARGET_TILEGX) @@ -5762,10 +5806,7 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka, return; give_sigsegv: - if (sig == TARGET_SIGSEGV) { - ka->_sa_handler = TARGET_SIG_DFL; - } - force_sig(TARGET_SIGSEGV /* , current */); + force_sigsegv(sig); } long do_rt_sigreturn(CPUTLGState *env) @@ -5795,6 +5836,7 @@ long do_rt_sigreturn(CPUTLGState *env) badframe: unlock_user_struct(frame, frame_addr, 0); force_sig(TARGET_SIGSEGV); + return -TARGET_QEMU_ESIGRETURN; } #else @@ -5849,6 +5891,10 @@ static void handle_pending_signal(CPUArchState *cpu_env, int sig, handler = sa->_sa_handler; } + if (do_strace) { + print_taken_signal(sig, &k->info); + } + if (handler == TARGET_SIG_DFL) { /* default handler : ignore some signal. The other are job control or fatal */ if (sig == TARGET_SIGTSTP || sig == TARGET_SIGTTIN || sig == TARGET_SIGTTOU) { @@ -5857,12 +5903,12 @@ static void handle_pending_signal(CPUArchState *cpu_env, int sig, sig != TARGET_SIGURG && sig != TARGET_SIGWINCH && sig != TARGET_SIGCONT) { - force_sig(sig); + dump_core_and_abort(sig); } } else if (handler == TARGET_SIG_IGN) { /* ignore sig */ } else if (handler == TARGET_SIG_ERR) { - force_sig(sig); + dump_core_and_abort(sig); } else { /* compute the blocked signals during the handler execution */ sigset_t *blocked_set; @@ -5921,6 +5967,7 @@ void process_pending_signals(CPUArchState *cpu_env) sigfillset(&set); sigprocmask(SIG_SETMASK, &set, 0); + restart_scan: sig = ts->sync_signal.pending; if (sig) { /* Synchronous signals are forced, @@ -5948,8 +5995,10 @@ void process_pending_signals(CPUArchState *cpu_env) (!sigismember(blocked_set, target_to_host_signal_table[sig]))) { handle_pending_signal(cpu_env, sig, &ts->sigtab[sig - 1]); - /* Restart scan from the beginning */ - sig = 1; + /* Restart scan from the beginning, as handle_pending_signal + * might have resulted in a new synchronous signal (eg SIGSEGV). + */ + goto restart_scan; } } |