Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 527 insertions, 0 deletions

diff --git a/arch/s390/kernel/signal.c b/arch/s390/kernel/signal.c
new file mode 100644
index 000000000000..610c1d03e975
--- /dev/null
+++ b/arch/s390/kernel/signal.c
@@ -0,0 +1,527 @@
+/*
+ *  arch/s390/kernel/signal.c
+ *
+ *  S390 version
+ *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
+ *    Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
+ *
+ *    Based on Intel version
+ * 
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  1997-11-28  Modified for POSIX.1b signals by Richard Henderson
+ */
+
+#include <linux/config.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/smp_lock.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/errno.h>
+#include <linux/wait.h>
+#include <linux/ptrace.h>
+#include <linux/unistd.h>
+#include <linux/stddef.h>
+#include <linux/tty.h>
+#include <linux/personality.h>
+#include <linux/binfmts.h>
+#include <asm/ucontext.h>
+#include <asm/uaccess.h>
+#include <asm/lowcore.h>
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+
+typedef struct 
+{
+        __u8 callee_used_stack[__SIGNAL_FRAMESIZE];
+        struct sigcontext sc;
+        _sigregs sregs;
+        int signo;
+        __u8 retcode[S390_SYSCALL_SIZE];
+} sigframe;
+
+typedef struct 
+{
+        __u8 callee_used_stack[__SIGNAL_FRAMESIZE];
+        __u8 retcode[S390_SYSCALL_SIZE];
+        struct siginfo info;
+        struct ucontext uc;
+} rt_sigframe;
+
+int do_signal(struct pt_regs *regs, sigset_t *oldset);
+
+/*
+ * Atomically swap in the new signal mask, and wait for a signal.
+ */
+asmlinkage int
+sys_sigsuspend(struct pt_regs * regs, int history0, int history1,
+               old_sigset_t mask)
+{
+        sigset_t saveset;
+
+        mask &= _BLOCKABLE;
+        spin_lock_irq(&current->sighand->siglock);
+        saveset = current->blocked;
+        siginitset(&current->blocked, mask);
+        recalc_sigpending();
+        spin_unlock_irq(&current->sighand->siglock);
+        regs->gprs[2] = -EINTR;
+
+        while (1) {
+                set_current_state(TASK_INTERRUPTIBLE);
+                schedule();
+                if (do_signal(regs, &saveset))
+                        return -EINTR;
+        }
+}
+
+asmlinkage long
+sys_rt_sigsuspend(struct pt_regs *regs, sigset_t __user *unewset,
+                                                size_t sigsetsize)
+{
+        sigset_t saveset, newset;
+
+        /* XXX: Don't preclude handling different sized sigset_t's.  */
+        if (sigsetsize != sizeof(sigset_t))
+                return -EINVAL;
+
+        if (copy_from_user(&newset, unewset, sizeof(newset)))
+                return -EFAULT;
+        sigdelsetmask(&newset, ~_BLOCKABLE);
+
+        spin_lock_irq(&current->sighand->siglock);
+        saveset = current->blocked;
+        current->blocked = newset;
+        recalc_sigpending();
+        spin_unlock_irq(&current->sighand->siglock);
+        regs->gprs[2] = -EINTR;
+
+        while (1) {
+                set_current_state(TASK_INTERRUPTIBLE);
+                schedule();
+                if (do_signal(regs, &saveset))
+                        return -EINTR;
+        }
+}
+
+asmlinkage long
+sys_sigaction(int sig, const struct old_sigaction __user *act,
+              struct old_sigaction __user *oact)
+{
+        struct k_sigaction new_ka, old_ka;
+        int ret;
+
+        if (act) {
+                old_sigset_t mask;
+                if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
+                    __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
+                    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer))
+                        return -EFAULT;
+                __get_user(new_ka.sa.sa_flags, &act->sa_flags);
+                __get_user(mask, &act->sa_mask);
+                siginitset(&new_ka.sa.sa_mask, mask);
+        }
+
+        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
+
+        if (!ret && oact) {
+                if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
+                    __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
+                    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer))
+                        return -EFAULT;
+                __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
+                __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
+        }
+
+        return ret;
+}
+
+asmlinkage long
+sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
+                                        struct pt_regs *regs)
+{
+        return do_sigaltstack(uss, uoss, regs->gprs[15]);
+}
+
+
+
+/* Returns non-zero on fault. */
+static int save_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
+{
+        unsigned long old_mask = regs->psw.mask;
+        int err;
+  
+        save_access_regs(current->thread.acrs);
+
+        /* Copy a 'clean' PSW mask to the user to avoid leaking
+           information about whether PER is currently on.  */
+        regs->psw.mask = PSW_MASK_MERGE(PSW_USER_BITS, regs->psw.mask);
+        err = __copy_to_user(&sregs->regs.psw, &regs->psw,
+                             sizeof(sregs->regs.psw)+sizeof(sregs->regs.gprs));
+        regs->psw.mask = old_mask;
+        if (err != 0)
+                return err;
+        err = __copy_to_user(&sregs->regs.acrs, current->thread.acrs,
+                             sizeof(sregs->regs.acrs));
+        if (err != 0)
+                return err;
+        /* 
+         * We have to store the fp registers to current->thread.fp_regs
+         * to merge them with the emulated registers.
+         */
+        save_fp_regs(&current->thread.fp_regs);
+        return __copy_to_user(&sregs->fpregs, &current->thread.fp_regs,
+                              sizeof(s390_fp_regs));
+}
+
+/* Returns positive number on error */
+static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
+{
+        unsigned long old_mask = regs->psw.mask;
+        int err;
+
+        /* Alwys make any pending restarted system call return -EINTR */
+        current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
+        err = __copy_from_user(&regs->psw, &sregs->regs.psw,
+                               sizeof(sregs->regs.psw)+sizeof(sregs->regs.gprs));
+        regs->psw.mask = PSW_MASK_MERGE(old_mask, regs->psw.mask);
+        regs->psw.addr |= PSW_ADDR_AMODE;
+        if (err)
+                return err;
+        err = __copy_from_user(&current->thread.acrs, &sregs->regs.acrs,
+                               sizeof(sregs->regs.acrs));
+        if (err)
+                return err;
+        restore_access_regs(current->thread.acrs);
+
+        err = __copy_from_user(&current->thread.fp_regs, &sregs->fpregs,
+                               sizeof(s390_fp_regs));
+        current->thread.fp_regs.fpc &= FPC_VALID_MASK;
+        if (err)
+                return err;
+
+        restore_fp_regs(&current->thread.fp_regs);
+        regs->trap = -1;        /* disable syscall checks */
+        return 0;
+}
+
+asmlinkage long sys_sigreturn(struct pt_regs *regs)
+{
+        sigframe __user *frame = (sigframe __user *)regs->gprs[15];
+        sigset_t set;
+
+        if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+                goto badframe;
+        if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE))
+                goto badframe;
+
+        sigdelsetmask(&set, ~_BLOCKABLE);
+        spin_lock_irq(&current->sighand->siglock);
+        current->blocked = set;
+        recalc_sigpending();
+        spin_unlock_irq(&current->sighand->siglock);
+
+        if (restore_sigregs(regs, &frame->sregs))
+                goto badframe;
+
+        return regs->gprs[2];
+
+badframe:
+        force_sig(SIGSEGV, current);
+        return 0;
+}
+
+asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
+{
+        rt_sigframe __user *frame = (rt_sigframe __user *)regs->gprs[15];
+        sigset_t set;
+
+        if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+                goto badframe;
+        if (__copy_from_user(&set.sig, &frame->uc.uc_sigmask, sizeof(set)))
+                goto badframe;
+
+        sigdelsetmask(&set, ~_BLOCKABLE);
+        spin_lock_irq(&current->sighand->siglock);
+        current->blocked = set;
+        recalc_sigpending();
+        spin_unlock_irq(&current->sighand->siglock);
+
+        if (restore_sigregs(regs, &frame->uc.uc_mcontext))
+                goto badframe;
+
+        /* It is more difficult to avoid calling this function than to
+           call it and ignore errors.  */
+        do_sigaltstack(&frame->uc.uc_stack, NULL, regs->gprs[15]);
+        return regs->gprs[2];
+
+badframe:
+        force_sig(SIGSEGV, current);
+        return 0;
+}
+
+/*
+ * Set up a signal frame.
+ */
+
+
+/*
+ * Determine which stack to use..
+ */
+static inline void __user *
+get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
+{
+        unsigned long sp;
+
+        /* Default to using normal stack */
+        sp = regs->gprs[15];
+
+        /* This is the X/Open sanctioned signal stack switching.  */
+        if (ka->sa.sa_flags & SA_ONSTACK) {
+                if (! sas_ss_flags(sp))
+                        sp = current->sas_ss_sp + current->sas_ss_size;
+        }
+
+        /* This is the legacy signal stack switching. */
+        else if (!user_mode(regs) &&
+                 !(ka->sa.sa_flags & SA_RESTORER) &&
+                 ka->sa.sa_restorer) {
+                sp = (unsigned long) ka->sa.sa_restorer;
+        }
+
+        return (void __user *)((sp - frame_size) & -8ul);
+}
+
+static inline int map_signal(int sig)
+{
+        if (current_thread_info()->exec_domain
+            && current_thread_info()->exec_domain->signal_invmap
+            && sig < 32)
+                return current_thread_info()->exec_domain->signal_invmap[sig];
+        else
+                return sig;
+}
+
+static void setup_frame(int sig, struct k_sigaction *ka,
+                        sigset_t *set, struct pt_regs * regs)
+{
+        sigframe __user *frame;
+
+        frame = get_sigframe(ka, regs, sizeof(sigframe));
+        if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe)))
+                goto give_sigsegv;
+
+        if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE))
+                goto give_sigsegv;
+
+        if (save_sigregs(regs, &frame->sregs))
+                goto give_sigsegv;
+        if (__put_user(&frame->sregs, &frame->sc.sregs))
+                goto give_sigsegv;
+
+        /* Set up to return from userspace.  If provided, use a stub
+           already in userspace.  */
+        if (ka->sa.sa_flags & SA_RESTORER) {
+                regs->gprs[14] = (unsigned long)
+                        ka->sa.sa_restorer | PSW_ADDR_AMODE;
+        } else {
+                regs->gprs[14] = (unsigned long)
+                        frame->retcode | PSW_ADDR_AMODE;
+                if (__put_user(S390_SYSCALL_OPCODE | __NR_sigreturn,
+                               (u16 __user *)(frame->retcode)))
+                        goto give_sigsegv;
+        }
+
+        /* Set up backchain. */
+        if (__put_user(regs->gprs[15], (addr_t __user *) frame))
+                goto give_sigsegv;
+
+        /* Set up registers for signal handler */
+        regs->gprs[15] = (unsigned long) frame;
+        regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE;
+
+        regs->gprs[2] = map_signal(sig);
+        regs->gprs[3] = (unsigned long) &frame->sc;
+
+        /* We forgot to include these in the sigcontext.
+           To avoid breaking binary compatibility, they are passed as args. */
+        regs->gprs[4] = current->thread.trap_no;
+        regs->gprs[5] = current->thread.prot_addr;
+
+        /* Place signal number on stack to allow backtrace from handler.  */
+        if (__put_user(regs->gprs[2], (int __user *) &frame->signo))
+                goto give_sigsegv;
+        return;
+
+give_sigsegv:
+        force_sigsegv(sig, current);
+}
+
+static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+                           sigset_t *set, struct pt_regs * regs)
+{
+        int err = 0;
+        rt_sigframe __user *frame;
+
+        frame = get_sigframe(ka, regs, sizeof(rt_sigframe));
+        if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe)))
+                goto give_sigsegv;
+
+        if (copy_siginfo_to_user(&frame->info, info))
+                goto give_sigsegv;
+
+        /* Create the ucontext.  */
+        err |= __put_user(0, &frame->uc.uc_flags);
+        err |= __put_user(0, &frame->uc.uc_link);
+        err |= __put_user((void *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
+        err |= __put_user(sas_ss_flags(regs->gprs[15]),
+                          &frame->uc.uc_stack.ss_flags);
+        err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
+        err |= save_sigregs(regs, &frame->uc.uc_mcontext);
+        err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+        if (err)
+                goto give_sigsegv;
+
+        /* Set up to return from userspace.  If provided, use a stub
+           already in userspace.  */
+        if (ka->sa.sa_flags & SA_RESTORER) {
+                regs->gprs[14] = (unsigned long)
+                        ka->sa.sa_restorer | PSW_ADDR_AMODE;
+        } else {
+                regs->gprs[14] = (unsigned long)
+                        frame->retcode | PSW_ADDR_AMODE;
+                err |= __put_user(S390_SYSCALL_OPCODE | __NR_rt_sigreturn,
+                                  (u16 __user *)(frame->retcode));
+        }
+
+        /* Set up backchain. */
+        if (__put_user(regs->gprs[15], (addr_t __user *) frame))
+                goto give_sigsegv;
+
+        /* Set up registers for signal handler */
+        regs->gprs[15] = (unsigned long) frame;
+        regs->psw.addr = (unsigned long) ka->sa.sa_handler | PSW_ADDR_AMODE;
+
+        regs->gprs[2] = map_signal(sig);
+        regs->gprs[3] = (unsigned long) &frame->info;
+        regs->gprs[4] = (unsigned long) &frame->uc;
+        return;
+
+give_sigsegv:
+        force_sigsegv(sig, current);
+}
+
+/*
+ * OK, we're invoking a handler
+ */     
+
+static void
+handle_signal(unsigned long sig, struct k_sigaction *ka,
+              siginfo_t *info, sigset_t *oldset, struct pt_regs * regs)
+{
+        /* Set up the stack frame */
+        if (ka->sa.sa_flags & SA_SIGINFO)
+                setup_rt_frame(sig, ka, info, oldset, regs);
+        else
+                setup_frame(sig, ka, oldset, regs);
+
+        if (!(ka->sa.sa_flags & SA_NODEFER)) {
+                spin_lock_irq(&current->sighand->siglock);
+                sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
+                sigaddset(&current->blocked,sig);
+                recalc_sigpending();
+                spin_unlock_irq(&current->sighand->siglock);
+        }
+}
+
+/*
+ * Note that 'init' is a special process: it doesn't get signals it doesn't
+ * want to handle. Thus you cannot kill init even with a SIGKILL even by
+ * mistake.
+ *
+ * Note that we go through the signals twice: once to check the signals that
+ * the kernel can handle, and then we build all the user-level signal handling
+ * stack-frames in one go after that.
+ */
+int do_signal(struct pt_regs *regs, sigset_t *oldset)
+{
+        unsigned long retval = 0, continue_addr = 0, restart_addr = 0;
+        siginfo_t info;
+        int signr;
+        struct k_sigaction ka;
+
+        /*
+         * We want the common case to go fast, which
+         * is why we may in certain cases get here from
+         * kernel mode. Just return without doing anything
+         * if so.
+         */
+        if (!user_mode(regs))
+                return 1;
+
+        if (!oldset)
+                oldset = &current->blocked;
+
+        /* Are we from a system call? */
+        if (regs->trap == __LC_SVC_OLD_PSW) {
+                continue_addr = regs->psw.addr;
+                restart_addr = continue_addr - regs->ilc;
+                retval = regs->gprs[2];
+
+                /* Prepare for system call restart.  We do this here so that a
+                   debugger will see the already changed PSW. */
+                if (retval == -ERESTARTNOHAND ||
+                    retval == -ERESTARTSYS ||
+                    retval == -ERESTARTNOINTR) {
+                        regs->gprs[2] = regs->orig_gpr2;
+                        regs->psw.addr = restart_addr;
+                } else if (retval == -ERESTART_RESTARTBLOCK) {
+                        regs->gprs[2] = -EINTR;
+                }
+        }
+
+        /* Get signal to deliver.  When running under ptrace, at this point
+           the debugger may change all our registers ... */
+        signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+
+        /* Depending on the signal settings we may need to revert the
+           decision to restart the system call. */
+        if (signr > 0 && regs->psw.addr == restart_addr) {
+                if (retval == -ERESTARTNOHAND
+                    || (retval == -ERESTARTSYS
+                         && !(current->sighand->action[signr-1].sa.sa_flags
+                              & SA_RESTART))) {
+                        regs->gprs[2] = -EINTR;
+                        regs->psw.addr = continue_addr;
+                }
+        }
+
+        if (signr > 0) {
+                /* Whee!  Actually deliver the signal.  */
+#ifdef CONFIG_S390_SUPPORT
+                if (test_thread_flag(TIF_31BIT)) {
+                        extern void handle_signal32(unsigned long sig,
+                                                    struct k_sigaction *ka,
+                                                    siginfo_t *info,
+                                                    sigset_t *oldset,
+                                                    struct pt_regs *regs);
+                        handle_signal32(signr, &ka, &info, oldset, regs);
+                        return 1;
+                }
+#endif
+                handle_signal(signr, &ka, &info, oldset, regs);
+                return 1;
+        }
+
+        /* Restart a different system call. */
+        if (retval == -ERESTART_RESTARTBLOCK
+            && regs->psw.addr == continue_addr) {
+                regs->gprs[2] = __NR_restart_syscall;
+                set_thread_flag(TIF_RESTART_SVC);
+        }
+        return 0;
+}