Return to unix_signal.c CVS log

Up to [Apple XNU] / XNU / bsd / dev / ppc

Annotation of XNU/bsd/dev/ppc/unix_signal.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /* 
        !            23:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !            24:  */
        !            25: 
        !            26: #include <mach/mach_types.h>
        !            27: #include <mach/exception_types.h>
        !            28: 
        !            29: #include <sys/param.h>
        !            30: #include <sys/proc.h>
        !            31: #include <sys/user.h>
        !            32: 
        !            33: #include <ppc/signal.h>
        !            34: #include <sys/signalvar.h>
        !            35: #include <kern/thread.h>
        !            36: #include <kern/thread_act.h>
        !            37: #include <mach/ppc/thread_status.h>
        !            38: 
        !            39: #define        C_REDZONE_LEN           224
        !            40: #define        C_STK_ALIGN                     16
        !            41: #define C_PARAMSAVE_LEN                64
        !            42: #define        C_LINKAGE_LEN           48
        !            43: #define TRUNC_DOWN(a,b,c)  (((((unsigned)a)-(b))/(c)) * (c))
        !            44: 
        !            45: /*
        !            46:  * Arrange for this process to run a signal handler
        !            47:  */
        !            48: 
        !            49: 
        !            50: struct sigregs {
        !            51:        struct ppc_saved_state ss;
        !            52:        struct ppc_float_state fs;
        !            53: };
        !            54: 
        !            55: void
        !            56: sendsig(p, catcher, sig, mask, code)
        !            57:        struct proc *p;
        !            58:        sig_t catcher;
        !            59:        int sig, mask;
        !            60:        u_long code;
        !            61: {
        !            62:        struct sigregs *p_regs;
        !            63:        struct sigcontext context, *p_context;
        !            64:        struct sigacts *ps = p->p_sigacts;
        !            65:        int framesize;
        !            66:        int oonstack;
        !            67:        unsigned long sp;
        !            68:        struct ppc_saved_state statep;
        !            69:        struct ppc_float_state fs;
        !            70:        unsigned long state_count;
        !            71:        struct thread *thread;
        !            72:        thread_act_t th_act;
        !            73:        unsigned long paramp,linkp;
        !            74: 
        !            75:        thread = current_thread();
        !            76:        th_act = current_act();
        !            77: 
        !            78:        state_count = PPC_THREAD_STATE_COUNT;
        !            79:        if (act_machine_get_state(th_act, PPC_THREAD_STATE, &statep, &state_count)  != KERN_SUCCESS) {
        !            80:                goto bad;
        !            81:        }       
        !            82:        state_count = PPC_FLOAT_STATE_COUNT;
        !            83:        if (act_machine_get_state(th_act, PPC_FLOAT_STATE, &fs, &state_count)  != KERN_SUCCESS) {
        !            84:                goto bad;
        !            85:        }       
        !            86: 
        !            87:        oonstack = ps->ps_sigstk.ss_flags & SA_ONSTACK;
        !            88: 
        !            89:        /* figure out where our new stack lives */
        !            90:        if ((ps->ps_flags & SAS_ALTSTACK) && !oonstack &&
        !            91:                (ps->ps_sigonstack & sigmask(sig))) {
        !            92:                sp = (unsigned long)(ps->ps_sigstk.ss_sp);
        !            93:                sp += ps->ps_sigstk.ss_size;
        !            94:                ps->ps_sigstk.ss_flags |= SA_ONSTACK;
        !            95:        }
        !            96:        else
        !            97:                sp = statep.r1;
        !            98: 
        !            99:        // preserve RED ZONE area
        !           100:        sp = TRUNC_DOWN(sp, C_REDZONE_LEN, C_STK_ALIGN);
        !           101: 
        !           102:        // context goes first on stack
        !           103:        sp -= sizeof(*p_context);
        !           104:        p_context = (struct sigcontext *) sp;
        !           105: 
        !           106:        // next are the saved registers
        !           107:        sp -= sizeof(*p_regs);
        !           108:        p_regs = (struct sigregs *)sp;
        !           109: 
        !           110:        // C calling conventions, create param save and linkage
        !           111:        // areas
        !           112: 
        !           113:        sp = TRUNC_DOWN(sp, C_PARAMSAVE_LEN, C_STK_ALIGN);
        !           114:        paramp = sp;
        !           115:        sp -= C_LINKAGE_LEN;
        !           116:        linkp = sp;
        !           117: 
        !           118:        /* fill out sigcontext */
        !           119:        context.sc_onstack = oonstack;
        !           120:        context.sc_mask = mask;
        !           121:        context.sc_ir = statep.srr0;
        !           122:        context.sc_psw = statep.srr1;
        !           123:        context.sc_regs = p_regs;
        !           124: 
        !           125:        /* copy info out to user space */
        !           126:        if (copyout((caddr_t)&context, (caddr_t)p_context, sizeof(context)))
        !           127:                goto bad;
        !           128:        if (copyout((caddr_t)&statep, (caddr_t)&p_regs->ss, 
        !           129:                        sizeof(struct ppc_saved_state)))
        !           130:                goto bad;
        !           131:        if (copyout((caddr_t)&fs, (caddr_t)&p_regs->fs,
        !           132:                        sizeof(struct ppc_float_state)))
        !           133:                goto bad;
        !           134: 
        !           135:        /* Place our arguments in arg registers: rtm dependent */
        !           136: 
        !           137:        statep.r3 = (unsigned long)sig;
        !           138:        statep.r4 = (unsigned long)code;
        !           139:        statep.r5 = (unsigned long)p_context;
        !           140: 
        !           141:        statep.srr0 = (unsigned long)catcher;
        !           142:        statep.srr1 = get_msr_exportmask();     /* MSR_EXPORT_MASK_SET */
        !           143:        statep.r1 = sp;
        !           144:        state_count = PPC_THREAD_STATE_COUNT;
        !           145:        if (act_machine_set_state(th_act, PPC_THREAD_STATE, &statep, &state_count)  != KERN_SUCCESS) {
        !           146:                goto bad;
        !           147:        }       
        !           148: 
        !           149:        return;
        !           150: 
        !           151: bad:
        !           152:        SIGACTION(p, SIGILL) = SIG_DFL;
        !           153:        sig = sigmask(SIGILL);
        !           154:        p->p_sigignore &= ~sig;
        !           155:        p->p_sigcatch &= ~sig;
        !           156:        p->p_sigmask &= ~sig;
        !           157:        psignal(p, SIGILL);
        !           158:        return;
        !           159: }
        !           160: 
        !           161: /*
        !           162:  * System call to cleanup state after a signal
        !           163:  * has been taken.  Reset signal mask and
        !           164:  * stack state from context left by sendsig (above).
        !           165:  * Return to previous pc and psl as specified by
        !           166:  * context left by sendsig. Check carefully to
        !           167:  * make sure that the user has not modified the
        !           168:  * psl to gain improper priviledges or to cause
        !           169:  * a machine fault.
        !           170:  */
        !           171: struct sigreturn_args {
        !           172:        struct sigcontext *sigcntxp;
        !           173: };
        !           174: 
        !           175: /* ARGSUSED */
        !           176: int
        !           177: sigreturn(p, uap, retval)
        !           178:        struct proc *p;
        !           179:        struct sigreturn_args *uap;
        !           180:        int *retval;
        !           181: {
        !           182:        struct sigcontext context;
        !           183:        struct sigregs *p_regs;
        !           184:        int error;
        !           185:        struct thread *thread;
        !           186:        thread_act_t th_act;
        !           187:        struct ppc_saved_state statep;
        !           188:        struct ppc_float_state fs;
        !           189:        unsigned long state_count;
        !           190:        unsigned int nbits, rbits;
        !           191: 
        !           192:        thread = current_thread();
        !           193:        th_act = current_act();
        !           194: 
        !           195:        if (error = copyin(uap->sigcntxp, &context, sizeof(context))) {
        !           196:                return(error);
        !           197:        }
        !           198:        state_count = PPC_THREAD_STATE_COUNT;
        !           199:        if (act_machine_get_state(th_act, PPC_THREAD_STATE, &statep, &state_count)  != KERN_SUCCESS) {
        !           200:                return(EINVAL);
        !           201:        }       
        !           202:        state_count = PPC_FLOAT_STATE_COUNT;
        !           203:        if (act_machine_get_state(th_act, PPC_FLOAT_STATE, &fs, &state_count)  != KERN_SUCCESS) {
        !           204:                return(EINVAL);
        !           205:        }       
        !           206:        nbits = get_msr_nbits();
        !           207:        rbits = get_msr_rbits();
        !           208:        /* adjust the critical fields */
        !           209:        /* make sure naughty bits are off */
        !           210:        context.sc_psw &= ~(nbits);
        !           211:        /* make sure necessary bits are on */
        !           212:        context.sc_psw |= (rbits);
        !           213: 
        !           214: //     /* we return from sigreturns as if we faulted in */
        !           215: //     entry->es_flags = (entry->es_flags & ~ES_GATEWAY) | ES_TRAP;
        !           216: 
        !           217:        if (context.sc_regs) {
        !           218:                p_regs = (struct sigregs *)context.sc_regs;
        !           219:                if (error = copyin(&p_regs->ss, &statep,
        !           220:                                sizeof(struct ppc_saved_state)))
        !           221:                        return(error);
        !           222: 
        !           223:                if (error = copyin(&p_regs->fs, &fs,
        !           224:                                sizeof(struct ppc_float_state)))
        !           225:                        return(error);
        !           226: 
        !           227:                }
        !           228:        else {
        !           229:                statep.r1 = context.sc_sp;
        !           230:        }
        !           231: //             entry->es_general.saved.stack_pointer = context.sc_sp;
        !           232: 
        !           233:        if (context.sc_onstack & 01)
        !           234:                        p->p_sigacts->ps_sigstk.ss_flags |= SA_ONSTACK;
        !           235:        else
        !           236:                p->p_sigacts->ps_sigstk.ss_flags &= ~SA_ONSTACK;
        !           237:        p->p_sigmask = context.sc_mask &~ sigcantmask;
        !           238:        statep.srr0 = context.sc_ir;
        !           239:        statep.srr1 = context.sc_psw;
        !           240: 
        !           241:        state_count = PPC_THREAD_STATE_COUNT;
        !           242:        if (act_machine_set_state(th_act, PPC_THREAD_STATE, &statep, &state_count)  != KERN_SUCCESS) {
        !           243:                return(EINVAL);
        !           244:        }       
        !           245: 
        !           246:        state_count = PPC_FLOAT_STATE_COUNT;
        !           247:        if (act_machine_set_state(th_act, PPC_FLOAT_STATE, &fs, &state_count)  != KERN_SUCCESS) {
        !           248:                return(EINVAL);
        !           249:        }       
        !           250:        return (EJUSTRETURN);
        !           251: }
        !           252: 
        !           253: /*
        !           254:  * machine_exception() performs MD translation
        !           255:  * of a mach exception to a unix signal and code.
        !           256:  */
        !           257: 
        !           258: boolean_t
        !           259: machine_exception(
        !           260:     int                exception,
        !           261:     int                code,
        !           262:     int                subcode,
        !           263:     int                *unix_signal,
        !           264:     int                *unix_code
        !           265: )
        !           266: {
        !           267:     switch(exception) {
        !           268: 
        !           269:     case EXC_BAD_INSTRUCTION:
        !           270:        *unix_signal = SIGILL;
        !           271:        *unix_code = code;
        !           272:        break;
        !           273: 
        !           274:     case EXC_ARITHMETIC:
        !           275:        *unix_signal = SIGFPE;
        !           276:        *unix_code = code;
        !           277:        break;
        !           278: 
        !           279:     case EXC_SOFTWARE:
        !           280:        if (code == EXC_PPC_TRAP) {
        !           281:                *unix_signal = SIGTRAP;
        !           282:                *unix_code = code;
        !           283:                break;
        !           284:        } else
        !           285:                return(FALSE);
        !           286: 
        !           287:     default:
        !           288:        return(FALSE);
        !           289:     }
        !           290:    
        !           291:     return(TRUE);
        !           292: }
        !           293: 

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.