| 1 |
199 |
simons |
/*
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| 2 |
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* linux/arch/m68knommu/kernel/signal.c
|
| 3 |
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*
|
| 4 |
|
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* Copyright (C) 1998 D. Jeff Dionne <jeff@ryeham.ee.ryerson.ca>,
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| 5 |
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* Kenneth Albanowski <kjahds@kjahds.com>,
|
| 6 |
|
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* The Silver Hammer Group, Ltd.
|
| 7 |
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*
|
| 8 |
|
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* Based on:
|
| 9 |
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*
|
| 10 |
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* linux/arch/m68k/kernel/signal.c
|
| 11 |
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*
|
| 12 |
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* Copyright (C) 1991, 1992 Linus Torvalds
|
| 13 |
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*
|
| 14 |
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* This file is subject to the terms and conditions of the GNU General Public
|
| 15 |
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* License. See the file COPYING in the main directory of this archive
|
| 16 |
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* for more details.
|
| 17 |
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*/
|
| 18 |
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| 19 |
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/*
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| 20 |
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* Linux/m68k support by Hamish Macdonald
|
| 21 |
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*
|
| 22 |
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* 68000 and CPU32 support D. Jeff Dionne
|
| 23 |
|
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* 68060 fixes by Jesper Skov
|
| 24 |
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*/
|
| 25 |
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| 26 |
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/*
|
| 27 |
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* ++roman (07/09/96): implemented signal stacks (specially for tosemu on
|
| 28 |
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* Atari :-) Current limitation: Only one sigstack can be active at one time.
|
| 29 |
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* If a second signal with SA_STACK set arrives while working on a sigstack,
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| 30 |
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* SA_STACK is ignored. This behaviour avoids lots of trouble with nested
|
| 31 |
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* signal handlers!
|
| 32 |
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*/
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| 33 |
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| 34 |
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#include <linux/config.h>
|
| 35 |
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| 36 |
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#include <linux/sched.h>
|
| 37 |
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#include <linux/mm.h>
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| 38 |
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#include <linux/kernel.h>
|
| 39 |
|
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#include <linux/signal.h>
|
| 40 |
|
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#include <linux/errno.h>
|
| 41 |
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#include <linux/wait.h>
|
| 42 |
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#include <linux/ptrace.h>
|
| 43 |
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#include <linux/unistd.h>
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| 44 |
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| 45 |
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#include <asm/setup.h>
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| 46 |
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#include <asm/segment.h>
|
| 47 |
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#include <asm/pgtable.h>
|
| 48 |
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#include <asm/traps.h>
|
| 49 |
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| 50 |
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/*
|
| 51 |
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#define DEBUG
|
| 52 |
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*/
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| 53 |
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| 54 |
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#define offsetof(type, member) ((size_t)(&((type *)0)->member))
|
| 55 |
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|
| 56 |
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#define _S(nr) (1<<((nr)-1))
|
| 57 |
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|
| 58 |
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#define _BLOCKABLE (~(_S(SIGKILL) | _S(SIGSTOP)))
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| 59 |
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|
| 60 |
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asmlinkage int sys_waitpid(pid_t pid,unsigned long * stat_addr, int options);
|
| 61 |
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asmlinkage int do_signal(unsigned long oldmask, struct pt_regs *regs);
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| 62 |
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| 63 |
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/*
|
| 64 |
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* atomically swap in the new signal mask, and wait for a signal.
|
| 65 |
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*/
|
| 66 |
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asmlinkage int do_sigsuspend(struct pt_regs *regs)
|
| 67 |
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{
|
| 68 |
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unsigned long oldmask = current->blocked;
|
| 69 |
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unsigned long newmask = regs->d3;
|
| 70 |
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|
| 71 |
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current->blocked = newmask & _BLOCKABLE;
|
| 72 |
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regs->d0 = -EINTR;
|
| 73 |
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while (1) {
|
| 74 |
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current->state = TASK_INTERRUPTIBLE;
|
| 75 |
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schedule();
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| 76 |
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if (do_signal(oldmask, regs))
|
| 77 |
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return -EINTR;
|
| 78 |
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}
|
| 79 |
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}
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| 80 |
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|
| 81 |
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asmlinkage int do_sigreturn(unsigned long __unused)
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| 82 |
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{
|
| 83 |
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struct sigcontext_struct context;
|
| 84 |
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struct pt_regs *regs;
|
| 85 |
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struct switch_stack *sw;
|
| 86 |
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int fsize = 0;
|
| 87 |
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unsigned long fp;
|
| 88 |
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unsigned long usp = rdusp();
|
| 89 |
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|
| 90 |
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#ifdef DEBUG
|
| 91 |
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printk("sys_sigreturn, usp=%08x\n", (unsigned) usp);
|
| 92 |
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#endif
|
| 93 |
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|
| 94 |
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/* get stack frame pointer */
|
| 95 |
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sw = (struct switch_stack *) &__unused;
|
| 96 |
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regs = (struct pt_regs *) (sw + 1);
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| 97 |
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|
| 98 |
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/* get previous context (including pointer to possible extra junk) */
|
| 99 |
|
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if (verify_area(VERIFY_READ, (void *)usp, sizeof(context)))
|
| 100 |
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goto badframe;
|
| 101 |
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|
| 102 |
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memcpy_fromfs(&context,(void *)usp, sizeof(context));
|
| 103 |
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|
| 104 |
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fp = usp + sizeof (context);
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| 105 |
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|
| 106 |
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/* restore signal mask */
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| 107 |
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current->blocked = context.sc_mask & _BLOCKABLE;
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| 108 |
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| 109 |
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/* restore passed registers */
|
| 110 |
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regs->d0 = context.sc_d0;
|
| 111 |
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regs->d1 = context.sc_d1;
|
| 112 |
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regs->a0 = context.sc_a0;
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| 113 |
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regs->a1 = context.sc_a1;
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| 114 |
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regs->sr = (regs->sr & 0xff00) | (context.sc_sr & 0xff);
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| 115 |
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regs->pc = context.sc_pc;
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| 116 |
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regs->orig_d0 = -1; /* disable syscall checks */
|
| 117 |
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wrusp(context.sc_usp);
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| 118 |
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|
| 119 |
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if (context.sc_usp != fp+fsize) {
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| 120 |
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#ifdef DEBUG
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| 121 |
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printk("Stack off by %d\n",context.sc_usp - (fp+fsize));
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| 122 |
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#endif
|
| 123 |
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current->flags &= ~PF_ONSIGSTK;
|
| 124 |
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}
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| 125 |
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|
| 126 |
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return regs->d0;
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| 127 |
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badframe:
|
| 128 |
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do_exit(SIGSEGV);
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| 129 |
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}
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| 130 |
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|
| 131 |
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/*
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| 132 |
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* Set up a signal frame...
|
| 133 |
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*
|
| 134 |
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* This routine is somewhat complicated by the fact that if the
|
| 135 |
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* kernel may be entered by an exception other than a system call;
|
| 136 |
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* e.g. a bus error or other "bad" exception. If this is the case,
|
| 137 |
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* then *all* the context on the kernel stack frame must be saved.
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| 138 |
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*
|
| 139 |
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* For a large number of exceptions, the stack frame format is the same
|
| 140 |
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* as that which will be created when the process traps back to the kernel
|
| 141 |
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* when finished executing the signal handler. In this case, nothing
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| 142 |
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* must be done. This is exception frame format "0". For exception frame
|
| 143 |
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* formats "2", "9", "A" and "B", the extra information on the frame must
|
| 144 |
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* be saved. This information is saved on the user stack and restored
|
| 145 |
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* when the signal handler is returned.
|
| 146 |
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*
|
| 147 |
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* The format of the user stack when executing the signal handler is:
|
| 148 |
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*
|
| 149 |
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* usp -> RETADDR (points to code below)
|
| 150 |
|
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* signum (parm #1)
|
| 151 |
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* sigcode (parm #2 ; vector number)
|
| 152 |
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* scp (parm #3 ; sigcontext pointer, pointer to #1 below)
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| 153 |
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* code1 (addaw #20,sp) ; pop parms and code off stack
|
| 154 |
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* code2 (moveq #119,d0; trap #0) ; sigreturn syscall
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| 155 |
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* #1| oldmask
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| 156 |
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* | old usp
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| 157 |
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* | d0 (first saved reg)
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| 158 |
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* | d1
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| 159 |
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* | a0
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| 160 |
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* | a1
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| 161 |
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* | sr (saved status register)
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| 162 |
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* | pc (old pc; one to return to)
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| 163 |
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* ----->| forvec (format and vector word of old supervisor stack frame)
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| 164 |
|
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* | floating point context
|
| 165 |
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*
|
| 166 |
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* These are optionally followed by some extra stuff, depending on the
|
| 167 |
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* stack frame interrupted. This is 1 longword for format "2", 3
|
| 168 |
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* longwords for format "9", 6 longwords for format "A", and 21
|
| 169 |
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* longwords for format "B".
|
| 170 |
|
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*
|
| 171 |
|
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* everything after ------> is not present if the processor does not push a vector
|
| 172 |
|
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* format. Only 68000 and the new 68000 modular core are like this
|
| 173 |
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*/
|
| 174 |
|
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|
| 175 |
|
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#define UFRAME_SIZE(fs) (sizeof(struct sigcontext_struct)/4 + 6 + fs/4)
|
| 176 |
|
|
|
| 177 |
|
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static void setup_frame (struct sigaction * sa, struct pt_regs *regs,
|
| 178 |
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int signr, unsigned long oldmask)
|
| 179 |
|
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{
|
| 180 |
|
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struct sigcontext_struct context;
|
| 181 |
|
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unsigned long *frame, *tframe;
|
| 182 |
|
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#define fsize 0
|
| 183 |
|
|
|
| 184 |
|
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frame = (unsigned long *)rdusp();
|
| 185 |
|
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if (!(current->flags & PF_ONSIGSTK) && (sa->sa_flags & SA_STACK)) {
|
| 186 |
|
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frame = (unsigned long *)sa->sa_restorer;
|
| 187 |
|
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current->flags |= PF_ONSIGSTK;
|
| 188 |
|
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}
|
| 189 |
|
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#ifdef DEBUG
|
| 190 |
|
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printk("setup_frame: usp %.8x\n",frame);
|
| 191 |
|
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#endif
|
| 192 |
|
|
frame -= UFRAME_SIZE(fsize);
|
| 193 |
|
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#ifdef DEBUG
|
| 194 |
|
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printk("setup_frame: frame %.8x\n",frame);
|
| 195 |
|
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#endif
|
| 196 |
|
|
if (verify_area(VERIFY_WRITE,frame,UFRAME_SIZE(fsize)*4))
|
| 197 |
|
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do_exit(SIGSEGV);
|
| 198 |
|
|
if (fsize) {
|
| 199 |
|
|
memcpy_tofs (frame + UFRAME_SIZE(0), regs + 1, fsize);
|
| 200 |
|
|
regs->stkadj = fsize;
|
| 201 |
|
|
}
|
| 202 |
|
|
|
| 203 |
|
|
/* set up the "normal" stack seen by the signal handler */
|
| 204 |
|
|
tframe = frame;
|
| 205 |
|
|
|
| 206 |
|
|
/* return address points to code on stack */
|
| 207 |
|
|
put_user((ulong)(frame+4), tframe); tframe++;
|
| 208 |
|
|
if (current->exec_domain && current->exec_domain->signal_invmap)
|
| 209 |
|
|
put_user(current->exec_domain->signal_invmap[signr], tframe);
|
| 210 |
|
|
else
|
| 211 |
|
|
put_user(signr, tframe);
|
| 212 |
|
|
tframe++;
|
| 213 |
|
|
tframe++;
|
| 214 |
|
|
/* "scp" parameter. points to sigcontext */
|
| 215 |
|
|
put_user((ulong)(frame+6), tframe); tframe++;
|
| 216 |
|
|
|
| 217 |
|
|
/* set up the return code... */
|
| 218 |
|
|
put_user(0xdefc0014,tframe); tframe++; /* addaw #20,sp */
|
| 219 |
|
|
put_user(0x70774e40,tframe); tframe++; /* moveq #119,d0; trap #0 */
|
| 220 |
|
|
|
| 221 |
|
|
/* setup and copy the sigcontext structure */
|
| 222 |
|
|
context.sc_mask = oldmask;
|
| 223 |
|
|
context.sc_usp = rdusp();
|
| 224 |
|
|
context.sc_d0 = regs->d0;
|
| 225 |
|
|
context.sc_d1 = regs->d1;
|
| 226 |
|
|
context.sc_a0 = regs->a0;
|
| 227 |
|
|
context.sc_a1 = regs->a1;
|
| 228 |
|
|
context.sc_sr = regs->sr;
|
| 229 |
|
|
context.sc_pc = regs->pc;
|
| 230 |
|
|
|
| 231 |
|
|
memcpy_tofs (tframe, &context, sizeof(context));
|
| 232 |
|
|
#ifdef DEBUG
|
| 233 |
|
|
printk("setup_frame: top tframe %.8x\n",tframe + sizeof(context));
|
| 234 |
|
|
#endif
|
| 235 |
|
|
|
| 236 |
|
|
/* Set up registers for signal handler */
|
| 237 |
|
|
wrusp ((unsigned long) frame);
|
| 238 |
|
|
regs->pc = (unsigned long) sa->sa_handler;
|
| 239 |
|
|
|
| 240 |
|
|
/* Prepare to skip over the extra stuff in the exception frame. */
|
| 241 |
|
|
if (regs->stkadj) {
|
| 242 |
|
|
struct pt_regs *tregs =
|
| 243 |
|
|
(struct pt_regs *)((ulong)regs + regs->stkadj);
|
| 244 |
|
|
|
| 245 |
|
|
#ifdef DEBUG
|
| 246 |
|
|
printk("Performing stackadjust=%04x\n", regs->stkadj);
|
| 247 |
|
|
#endif
|
| 248 |
|
|
|
| 249 |
|
|
/* This must be copied with decreasing addresses to
|
| 250 |
|
|
handle overlaps. */
|
| 251 |
|
|
tregs->pc = regs->pc;
|
| 252 |
|
|
tregs->sr = regs->sr;
|
| 253 |
|
|
}
|
| 254 |
|
|
}
|
| 255 |
|
|
|
| 256 |
|
|
/*
|
| 257 |
|
|
* OK, we're invoking a handler
|
| 258 |
|
|
*/
|
| 259 |
|
|
static void handle_signal(unsigned long signr, struct sigaction *sa,
|
| 260 |
|
|
unsigned long oldmask, struct pt_regs *regs)
|
| 261 |
|
|
{
|
| 262 |
|
|
#ifdef DEBUG
|
| 263 |
|
|
printk("Entering handle_signal, signr=%d\n", signr);
|
| 264 |
|
|
#endif
|
| 265 |
|
|
/* are we from a system call? */
|
| 266 |
|
|
if (regs->orig_d0 >= 0) {
|
| 267 |
|
|
/* If so, check system call restarting.. */
|
| 268 |
|
|
switch (regs->d0) {
|
| 269 |
|
|
case -ERESTARTNOHAND:
|
| 270 |
|
|
regs->d0 = -EINTR;
|
| 271 |
|
|
break;
|
| 272 |
|
|
|
| 273 |
|
|
case -ERESTARTSYS:
|
| 274 |
|
|
if (!(sa->sa_flags & SA_RESTART)) {
|
| 275 |
|
|
regs->d0 = -EINTR;
|
| 276 |
|
|
break;
|
| 277 |
|
|
}
|
| 278 |
|
|
/* fallthrough */
|
| 279 |
|
|
case -ERESTARTNOINTR:
|
| 280 |
|
|
regs->d0 = regs->orig_d0;
|
| 281 |
|
|
regs->pc -= 2;
|
| 282 |
|
|
}
|
| 283 |
|
|
}
|
| 284 |
|
|
|
| 285 |
|
|
/* set up the stack frame */
|
| 286 |
|
|
setup_frame(sa, regs, signr, oldmask);
|
| 287 |
|
|
|
| 288 |
|
|
if (sa->sa_flags & SA_ONESHOT)
|
| 289 |
|
|
sa->sa_handler = NULL;
|
| 290 |
|
|
if (!(sa->sa_flags & SA_NOMASK))
|
| 291 |
|
|
current->blocked |= (sa->sa_mask | _S(signr)) & _BLOCKABLE;
|
| 292 |
|
|
}
|
| 293 |
|
|
|
| 294 |
|
|
/*
|
| 295 |
|
|
* Note that 'init' is a special process: it doesn't get signals it doesn't
|
| 296 |
|
|
* want to handle. Thus you cannot kill init even with a SIGKILL even by
|
| 297 |
|
|
* mistake.
|
| 298 |
|
|
*
|
| 299 |
|
|
* Note that we go through the signals twice: once to check the signals
|
| 300 |
|
|
* that the kernel can handle, and then we build all the user-level signal
|
| 301 |
|
|
* handling stack-frames in one go after that.
|
| 302 |
|
|
*/
|
| 303 |
|
|
asmlinkage int do_signal(unsigned long oldmask, struct pt_regs *regs)
|
| 304 |
|
|
{
|
| 305 |
|
|
unsigned long mask = ~current->blocked;
|
| 306 |
|
|
unsigned long signr;
|
| 307 |
|
|
struct sigaction * sa;
|
| 308 |
|
|
|
| 309 |
|
|
current->tss.esp0 = (unsigned long) regs;
|
| 310 |
|
|
|
| 311 |
|
|
/* If the process is traced, all signals are passed to the debugger. */
|
| 312 |
|
|
if (current->flags & PF_PTRACED)
|
| 313 |
|
|
mask = ~0UL;
|
| 314 |
|
|
while ((signr = current->signal & mask) != 0) {
|
| 315 |
|
|
signr = ffz(~signr);
|
| 316 |
|
|
clear_bit(signr, ¤t->signal);
|
| 317 |
|
|
sa = current->sig->action + signr;
|
| 318 |
|
|
signr++;
|
| 319 |
|
|
|
| 320 |
|
|
#ifdef DEBUG
|
| 321 |
|
|
printk("Signal %d: ", sa->sa_handler);
|
| 322 |
|
|
#endif
|
| 323 |
|
|
|
| 324 |
|
|
if ((current->flags & PF_PTRACED) && signr != SIGKILL) {
|
| 325 |
|
|
current->exit_code = signr;
|
| 326 |
|
|
current->state = TASK_STOPPED;
|
| 327 |
|
|
|
| 328 |
|
|
/* Did we come from a system call? */
|
| 329 |
|
|
if (regs->orig_d0 >= 0) {
|
| 330 |
|
|
/* Restart the system call */
|
| 331 |
|
|
if (regs->d0 == -ERESTARTNOHAND ||
|
| 332 |
|
|
regs->d0 == -ERESTARTSYS ||
|
| 333 |
|
|
regs->d0 == -ERESTARTNOINTR) {
|
| 334 |
|
|
regs->d0 = regs->orig_d0;
|
| 335 |
|
|
regs->pc -= 2;
|
| 336 |
|
|
}
|
| 337 |
|
|
}
|
| 338 |
|
|
notify_parent(current, SIGCHLD);
|
| 339 |
|
|
schedule();
|
| 340 |
|
|
if (!(signr = current->exit_code)) {
|
| 341 |
|
|
discard_frame:
|
| 342 |
|
|
continue;
|
| 343 |
|
|
}
|
| 344 |
|
|
current->exit_code = 0;
|
| 345 |
|
|
if (signr == SIGSTOP)
|
| 346 |
|
|
goto discard_frame;
|
| 347 |
|
|
if (_S(signr) & current->blocked) {
|
| 348 |
|
|
current->signal |= _S(signr);
|
| 349 |
|
|
mask &= ~_S(signr);
|
| 350 |
|
|
continue;
|
| 351 |
|
|
}
|
| 352 |
|
|
sa = current->sig->action + signr - 1;
|
| 353 |
|
|
}
|
| 354 |
|
|
if (sa->sa_handler == SIG_IGN) {
|
| 355 |
|
|
#ifdef DEBUG
|
| 356 |
|
|
printk("Ignoring.\n");
|
| 357 |
|
|
#endif
|
| 358 |
|
|
if (signr != SIGCHLD)
|
| 359 |
|
|
continue;
|
| 360 |
|
|
/* check for SIGCHLD: it's special */
|
| 361 |
|
|
while (sys_waitpid(-1,NULL,WNOHANG) > 0)
|
| 362 |
|
|
/* nothing */;
|
| 363 |
|
|
continue;
|
| 364 |
|
|
}
|
| 365 |
|
|
if (sa->sa_handler == SIG_DFL) {
|
| 366 |
|
|
#ifdef DEBUG
|
| 367 |
|
|
printk("Default.\n");
|
| 368 |
|
|
#endif
|
| 369 |
|
|
if (current->pid == 1)
|
| 370 |
|
|
continue;
|
| 371 |
|
|
switch (signr) {
|
| 372 |
|
|
case SIGCONT: case SIGCHLD: case SIGWINCH:
|
| 373 |
|
|
continue;
|
| 374 |
|
|
|
| 375 |
|
|
case SIGTSTP: case SIGTTIN: case SIGTTOU:
|
| 376 |
|
|
if (is_orphaned_pgrp(current->pgrp))
|
| 377 |
|
|
continue;
|
| 378 |
|
|
case SIGSTOP:
|
| 379 |
|
|
if (current->flags & PF_PTRACED)
|
| 380 |
|
|
continue;
|
| 381 |
|
|
current->state = TASK_STOPPED;
|
| 382 |
|
|
current->exit_code = signr;
|
| 383 |
|
|
if (!(current->p_pptr->sig->action[SIGCHLD-1].sa_flags &
|
| 384 |
|
|
SA_NOCLDSTOP))
|
| 385 |
|
|
notify_parent(current, SIGCHLD);
|
| 386 |
|
|
schedule();
|
| 387 |
|
|
continue;
|
| 388 |
|
|
|
| 389 |
|
|
case SIGQUIT: case SIGILL: case SIGTRAP:
|
| 390 |
|
|
case SIGIOT: case SIGFPE: case SIGSEGV:
|
| 391 |
|
|
if (current->binfmt && current->binfmt->core_dump) {
|
| 392 |
|
|
if (current->binfmt->core_dump(signr, regs))
|
| 393 |
|
|
signr |= 0x80;
|
| 394 |
|
|
}
|
| 395 |
|
|
/* fall through */
|
| 396 |
|
|
default:
|
| 397 |
|
|
current->signal |= _S(signr & 0x7f);
|
| 398 |
|
|
current->flags |= PF_SIGNALED;
|
| 399 |
|
|
do_exit(signr);
|
| 400 |
|
|
}
|
| 401 |
|
|
}
|
| 402 |
|
|
handle_signal(signr, sa, oldmask, regs);
|
| 403 |
|
|
return 1;
|
| 404 |
|
|
}
|
| 405 |
|
|
|
| 406 |
|
|
/* Did we come from a system call? */
|
| 407 |
|
|
if (regs->orig_d0 >= 0) {
|
| 408 |
|
|
/* Restart the system call - no handlers present */
|
| 409 |
|
|
if (regs->d0 == -ERESTARTNOHAND ||
|
| 410 |
|
|
regs->d0 == -ERESTARTSYS ||
|
| 411 |
|
|
regs->d0 == -ERESTARTNOINTR) {
|
| 412 |
|
|
regs->d0 = regs->orig_d0;
|
| 413 |
|
|
regs->pc -= 2;
|
| 414 |
|
|
}
|
| 415 |
|
|
}
|
| 416 |
|
|
|
| 417 |
|
|
/* If we are about to discard some frame stuff we must copy
|
| 418 |
|
|
over the remaining frame. */
|
| 419 |
|
|
if (regs->stkadj) {
|
| 420 |
|
|
struct pt_regs *tregs =
|
| 421 |
|
|
(struct pt_regs *) ((ulong) regs + regs->stkadj);
|
| 422 |
|
|
#if defined(DEBUG) || 1
|
| 423 |
|
|
printk("!!!!!!!!!!!!!! stkadj !!!\n");
|
| 424 |
|
|
#endif
|
| 425 |
|
|
/* This must be copied with decreasing addresses to
|
| 426 |
|
|
handle overlaps. */
|
| 427 |
|
|
tregs->pc = regs->pc;
|
| 428 |
|
|
tregs->sr = regs->sr;
|
| 429 |
|
|
}
|
| 430 |
|
|
return 0;
|
| 431 |
|
|
}
|
