diff options
Diffstat (limited to 'arch/um/sys-i386/signal.c')
| -rw-r--r-- | arch/um/sys-i386/signal.c | 404 |
1 files changed, 0 insertions, 404 deletions
diff --git a/arch/um/sys-i386/signal.c b/arch/um/sys-i386/signal.c deleted file mode 100644 index 1cbf95f6858..00000000000 --- a/arch/um/sys-i386/signal.c +++ /dev/null @@ -1,404 +0,0 @@ -/* - * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com) - * Licensed under the GPL - */ - -#include "linux/signal.h" -#include "linux/ptrace.h" -#include "asm/current.h" -#include "asm/ucontext.h" -#include "asm/uaccess.h" -#include "asm/unistd.h" -#include "frame_kern.h" -#include "sigcontext.h" -#include "registers.h" -#include "mode.h" - -#ifdef CONFIG_MODE_SKAS - -#include "skas.h" - -void copy_sc(union uml_pt_regs *regs, void *from) -{ - struct sigcontext *sc = from; - - REGS_GS(regs->skas.regs) = sc->gs; - REGS_FS(regs->skas.regs) = sc->fs; - REGS_ES(regs->skas.regs) = sc->es; - REGS_DS(regs->skas.regs) = sc->ds; - REGS_EDI(regs->skas.regs) = sc->edi; - REGS_ESI(regs->skas.regs) = sc->esi; - REGS_EBP(regs->skas.regs) = sc->ebp; - REGS_SP(regs->skas.regs) = sc->esp; - REGS_EBX(regs->skas.regs) = sc->ebx; - REGS_EDX(regs->skas.regs) = sc->edx; - REGS_ECX(regs->skas.regs) = sc->ecx; - REGS_EAX(regs->skas.regs) = sc->eax; - REGS_IP(regs->skas.regs) = sc->eip; - REGS_CS(regs->skas.regs) = sc->cs; - REGS_EFLAGS(regs->skas.regs) = sc->eflags; - REGS_SS(regs->skas.regs) = sc->ss; -} - -static int copy_sc_from_user_skas(struct pt_regs *regs, - struct sigcontext __user *from) -{ - struct sigcontext sc; - unsigned long fpregs[HOST_FP_SIZE]; - int err; - - err = copy_from_user(&sc, from, sizeof(sc)); - err |= copy_from_user(fpregs, sc.fpstate, sizeof(fpregs)); - if(err) - return err; - - copy_sc(®s->regs, &sc); - - err = restore_fp_registers(userspace_pid[0], fpregs); - if(err < 0) { - printk("copy_sc_from_user_skas - PTRACE_SETFPREGS failed, " - "errno = %d\n", -err); - return err; - } - - return 0; -} - -int copy_sc_to_user_skas(struct sigcontext __user *to, struct _fpstate __user *to_fp, - struct pt_regs *regs, unsigned long sp) -{ - struct sigcontext sc; - unsigned long fpregs[HOST_FP_SIZE]; - struct faultinfo * fi = ¤t->thread.arch.faultinfo; - int err; - - sc.gs = REGS_GS(regs->regs.skas.regs); - sc.fs = REGS_FS(regs->regs.skas.regs); - sc.es = REGS_ES(regs->regs.skas.regs); - sc.ds = REGS_DS(regs->regs.skas.regs); - sc.edi = REGS_EDI(regs->regs.skas.regs); - sc.esi = REGS_ESI(regs->regs.skas.regs); - sc.ebp = REGS_EBP(regs->regs.skas.regs); - sc.esp = sp; - sc.ebx = REGS_EBX(regs->regs.skas.regs); - sc.edx = REGS_EDX(regs->regs.skas.regs); - sc.ecx = REGS_ECX(regs->regs.skas.regs); - sc.eax = REGS_EAX(regs->regs.skas.regs); - sc.eip = REGS_IP(regs->regs.skas.regs); - sc.cs = REGS_CS(regs->regs.skas.regs); - sc.eflags = REGS_EFLAGS(regs->regs.skas.regs); - sc.esp_at_signal = regs->regs.skas.regs[UESP]; - sc.ss = regs->regs.skas.regs[SS]; - sc.cr2 = fi->cr2; - sc.err = fi->error_code; - sc.trapno = fi->trap_no; - - err = save_fp_registers(userspace_pid[0], fpregs); - if(err < 0){ - printk("copy_sc_to_user_skas - PTRACE_GETFPREGS failed, " - "errno = %d\n", err); - return 1; - } - to_fp = (to_fp ? to_fp : (struct _fpstate __user *) (to + 1)); - sc.fpstate = to_fp; - - if(err) - return err; - - return copy_to_user(to, &sc, sizeof(sc)) || - copy_to_user(to_fp, fpregs, sizeof(fpregs)); -} -#endif - -#ifdef CONFIG_MODE_TT - -/* These copy a sigcontext to/from userspace. They copy the fpstate pointer, - * blowing away the old, good one. So, that value is saved, and then restored - * after the sigcontext copy. In copy_from, the variable holding the saved - * fpstate pointer, and the sigcontext that it should be restored to are both - * in the kernel, so we can just restore using an assignment. In copy_to, the - * saved pointer is in the kernel, but the sigcontext is in userspace, so we - * copy_to_user it. - */ -int copy_sc_from_user_tt(struct sigcontext *to, struct sigcontext __user *from, - int fpsize) -{ - struct _fpstate *to_fp; - struct _fpstate __user *from_fp; - unsigned long sigs; - int err; - - to_fp = to->fpstate; - sigs = to->oldmask; - err = copy_from_user(to, from, sizeof(*to)); - from_fp = to->fpstate; - to->oldmask = sigs; - to->fpstate = to_fp; - if(to_fp != NULL) - err |= copy_from_user(to_fp, from_fp, fpsize); - return err; -} - -int copy_sc_to_user_tt(struct sigcontext __user *to, struct _fpstate __user *fp, - struct sigcontext *from, int fpsize, unsigned long sp) -{ - struct _fpstate __user *to_fp; - struct _fpstate *from_fp; - int err; - - to_fp = (fp ? fp : (struct _fpstate __user *) (to + 1)); - from_fp = from->fpstate; - err = copy_to_user(to, from, sizeof(*to)); - - /* The SP in the sigcontext is the updated one for the signal - * delivery. The sp passed in is the original, and this needs - * to be restored, so we stick it in separately. - */ - err |= copy_to_user(&SC_SP(to), &sp, sizeof(sp)); - - if(from_fp != NULL){ - err |= copy_to_user(&to->fpstate, &to_fp, sizeof(to->fpstate)); - err |= copy_to_user(to_fp, from_fp, fpsize); - } - return err; -} -#endif - -static int copy_sc_from_user(struct pt_regs *to, void __user *from) -{ - int ret; - - ret = CHOOSE_MODE(copy_sc_from_user_tt(UPT_SC(&to->regs), from, - sizeof(struct _fpstate)), - copy_sc_from_user_skas(to, from)); - return ret; -} - -static int copy_sc_to_user(struct sigcontext __user *to, struct _fpstate __user *fp, - struct pt_regs *from, unsigned long sp) -{ - return CHOOSE_MODE(copy_sc_to_user_tt(to, fp, UPT_SC(&from->regs), - sizeof(*fp), sp), - copy_sc_to_user_skas(to, fp, from, sp)); -} - -static int copy_ucontext_to_user(struct ucontext __user *uc, struct _fpstate __user *fp, - sigset_t *set, unsigned long sp) -{ - int err = 0; - - err |= put_user(current->sas_ss_sp, &uc->uc_stack.ss_sp); - err |= put_user(sas_ss_flags(sp), &uc->uc_stack.ss_flags); - err |= put_user(current->sas_ss_size, &uc->uc_stack.ss_size); - err |= copy_sc_to_user(&uc->uc_mcontext, fp, ¤t->thread.regs, sp); - err |= copy_to_user(&uc->uc_sigmask, set, sizeof(*set)); - return err; -} - -struct sigframe -{ - char __user *pretcode; - int sig; - struct sigcontext sc; - struct _fpstate fpstate; - unsigned long extramask[_NSIG_WORDS-1]; - char retcode[8]; -}; - -struct rt_sigframe -{ - char __user *pretcode; - int sig; - struct siginfo __user *pinfo; - void __user *puc; - struct siginfo info; - struct ucontext uc; - struct _fpstate fpstate; - char retcode[8]; -}; - -int setup_signal_stack_sc(unsigned long stack_top, int sig, - struct k_sigaction *ka, struct pt_regs *regs, - sigset_t *mask) -{ - struct sigframe __user *frame; - void __user *restorer; - unsigned long save_sp = PT_REGS_SP(regs); - int err = 0; - - /* This is the same calculation as i386 - ((sp + 4) & 15) == 0 */ - stack_top = ((stack_top + 4) & -16UL) - 4; - frame = (struct sigframe __user *) stack_top - 1; - if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) - return 1; - - restorer = frame->retcode; - if(ka->sa.sa_flags & SA_RESTORER) - restorer = ka->sa.sa_restorer; - - /* Update SP now because the page fault handler refuses to extend - * the stack if the faulting address is too far below the current - * SP, which frame now certainly is. If there's an error, the original - * value is restored on the way out. - * When writing the sigcontext to the stack, we have to write the - * original value, so that's passed to copy_sc_to_user, which does - * the right thing with it. - */ - PT_REGS_SP(regs) = (unsigned long) frame; - - err |= __put_user(restorer, &frame->pretcode); - err |= __put_user(sig, &frame->sig); - err |= copy_sc_to_user(&frame->sc, NULL, regs, save_sp); - err |= __put_user(mask->sig[0], &frame->sc.oldmask); - if (_NSIG_WORDS > 1) - err |= __copy_to_user(&frame->extramask, &mask->sig[1], - sizeof(frame->extramask)); - - /* - * This is popl %eax ; movl $,%eax ; int $0x80 - * - * WE DO NOT USE IT ANY MORE! It's only left here for historical - * reasons and because gdb uses it as a signature to notice - * signal handler stack frames. - */ - err |= __put_user(0xb858, (short __user *)(frame->retcode+0)); - err |= __put_user(__NR_sigreturn, (int __user *)(frame->retcode+2)); - err |= __put_user(0x80cd, (short __user *)(frame->retcode+6)); - - if(err) - goto err; - - PT_REGS_SP(regs) = (unsigned long) frame; - PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler; - PT_REGS_EAX(regs) = (unsigned long) sig; - PT_REGS_EDX(regs) = (unsigned long) 0; - PT_REGS_ECX(regs) = (unsigned long) 0; - - if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED)) - ptrace_notify(SIGTRAP); - return 0; - -err: - PT_REGS_SP(regs) = save_sp; - return err; -} - -int setup_signal_stack_si(unsigned long stack_top, int sig, - struct k_sigaction *ka, struct pt_regs *regs, - siginfo_t *info, sigset_t *mask) -{ - struct rt_sigframe __user *frame; - void __user *restorer; - unsigned long save_sp = PT_REGS_SP(regs); - int err = 0; - - stack_top &= -8UL; - frame = (struct rt_sigframe __user *) stack_top - 1; - if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame))) - return 1; - - restorer = frame->retcode; - if(ka->sa.sa_flags & SA_RESTORER) - restorer = ka->sa.sa_restorer; - - /* See comment above about why this is here */ - PT_REGS_SP(regs) = (unsigned long) frame; - - err |= __put_user(restorer, &frame->pretcode); - err |= __put_user(sig, &frame->sig); - err |= __put_user(&frame->info, &frame->pinfo); - err |= __put_user(&frame->uc, &frame->puc); - err |= copy_siginfo_to_user(&frame->info, info); - err |= copy_ucontext_to_user(&frame->uc, &frame->fpstate, mask, - save_sp); - - /* - * This is movl $,%eax ; int $0x80 - * - * WE DO NOT USE IT ANY MORE! It's only left here for historical - * reasons and because gdb uses it as a signature to notice - * signal handler stack frames. - */ - err |= __put_user(0xb8, (char __user *)(frame->retcode+0)); - err |= __put_user(__NR_rt_sigreturn, (int __user *)(frame->retcode+1)); - err |= __put_user(0x80cd, (short __user *)(frame->retcode+5)); - - if(err) - goto err; - - PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler; - PT_REGS_EAX(regs) = (unsigned long) sig; - PT_REGS_EDX(regs) = (unsigned long) &frame->info; - PT_REGS_ECX(regs) = (unsigned long) &frame->uc; - - if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED)) - ptrace_notify(SIGTRAP); - return 0; - -err: - PT_REGS_SP(regs) = save_sp; - return err; -} - -long sys_sigreturn(struct pt_regs regs) -{ - unsigned long sp = PT_REGS_SP(¤t->thread.regs); - struct sigframe __user *frame = (struct sigframe __user *)(sp - 8); - sigset_t set; - struct sigcontext __user *sc = &frame->sc; - unsigned long __user *oldmask = &sc->oldmask; - unsigned long __user *extramask = frame->extramask; - int sig_size = (_NSIG_WORDS - 1) * sizeof(unsigned long); - - if(copy_from_user(&set.sig[0], oldmask, sizeof(set.sig[0])) || - copy_from_user(&set.sig[1], extramask, sig_size)) - goto segfault; - - sigdelsetmask(&set, ~_BLOCKABLE); - - spin_lock_irq(¤t->sighand->siglock); - current->blocked = set; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - - if(copy_sc_from_user(¤t->thread.regs, sc)) - goto segfault; - - /* Avoid ERESTART handling */ - PT_REGS_SYSCALL_NR(¤t->thread.regs) = -1; - return PT_REGS_SYSCALL_RET(¤t->thread.regs); - - segfault: - force_sig(SIGSEGV, current); - return 0; -} - -long sys_rt_sigreturn(struct pt_regs regs) -{ - unsigned long sp = PT_REGS_SP(¤t->thread.regs); - struct rt_sigframe __user *frame = (struct rt_sigframe __user *) (sp - 4); - sigset_t set; - struct ucontext __user *uc = &frame->uc; - int sig_size = _NSIG_WORDS * sizeof(unsigned long); - - if(copy_from_user(&set, &uc->uc_sigmask, sig_size)) - goto segfault; - - sigdelsetmask(&set, ~_BLOCKABLE); - - spin_lock_irq(¤t->sighand->siglock); - current->blocked = set; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - - if(copy_sc_from_user(¤t->thread.regs, &uc->uc_mcontext)) - goto segfault; - - /* Avoid ERESTART handling */ - PT_REGS_SYSCALL_NR(¤t->thread.regs) = -1; - return PT_REGS_SYSCALL_RET(¤t->thread.regs); - - segfault: - force_sig(SIGSEGV, current); - return 0; -} |