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, 665 insertions, 0 deletions

diff --git a/arch/i386/kernel/signal.c b/arch/i386/kernel/signal.c
new file mode 100644
index 000000000000..ef3602e1c052
--- /dev/null
+++ b/arch/i386/kernel/signal.c
@@ -0,0 +1,665 @@
+/*
+ *  linux/arch/i386/kernel/signal.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  1997-11-28  Modified for POSIX.1b signals by Richard Henderson
+ *  2000-06-20  Pentium III FXSR, SSE support by Gareth Hughes
+ */
+
+#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/unistd.h>
+#include <linux/stddef.h>
+#include <linux/personality.h>
+#include <linux/suspend.h>
+#include <linux/ptrace.h>
+#include <linux/elf.h>
+#include <asm/processor.h>
+#include <asm/ucontext.h>
+#include <asm/uaccess.h>
+#include <asm/i387.h>
+#include "sigframe.h"
+
+#define DEBUG_SIG 0
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+/*
+ * Atomically swap in the new signal mask, and wait for a signal.
+ */
+asmlinkage int
+sys_sigsuspend(int history0, int history1, old_sigset_t mask)
+{
+        struct pt_regs * regs = (struct pt_regs *) &history0;
+        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->eax = -EINTR;
+        while (1) {
+                current->state = TASK_INTERRUPTIBLE;
+                schedule();
+                if (do_signal(regs, &saveset))
+                        return -EINTR;
+        }
+}
+
+asmlinkage int
+sys_rt_sigsuspend(struct pt_regs regs)
+{
+        sigset_t saveset, newset;
+
+        /* XXX: Don't preclude handling different sized sigset_t's.  */
+        if (regs.ecx != sizeof(sigset_t))
+                return -EINVAL;
+
+        if (copy_from_user(&newset, (sigset_t __user *)regs.ebx, 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.eax = -EINTR;
+        while (1) {
+                current->state = TASK_INTERRUPTIBLE;
+                schedule();
+                if (do_signal(&regs, &saveset))
+                        return -EINTR;
+        }
+}
+
+asmlinkage int 
+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 int
+sys_sigaltstack(unsigned long ebx)
+{
+        /* This is needed to make gcc realize it doesn't own the "struct pt_regs" */
+        struct pt_regs *regs = (struct pt_regs *)&ebx;
+        const stack_t __user *uss = (const stack_t __user *)ebx;
+        stack_t __user *uoss = (stack_t __user *)regs->ecx;
+
+        return do_sigaltstack(uss, uoss, regs->esp);
+}
+
+
+/*
+ * Do a signal return; undo the signal stack.
+ */
+
+static int
+restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, int *peax)
+{
+        unsigned int err = 0;
+
+        /* Always make any pending restarted system calls return -EINTR */
+        current_thread_info()->restart_block.fn = do_no_restart_syscall;
+
+#define COPY(x)         err |= __get_user(regs->x, &sc->x)
+
+#define COPY_SEG(seg)                                                   \
+        { unsigned short tmp;                                           \
+          err |= __get_user(tmp, &sc->seg);                             \
+          regs->x##seg = tmp; }
+
+#define COPY_SEG_STRICT(seg)                                            \
+        { unsigned short tmp;                                           \
+          err |= __get_user(tmp, &sc->seg);                             \
+          regs->x##seg = tmp|3; }
+
+#define GET_SEG(seg)                                                    \
+        { unsigned short tmp;                                           \
+          err |= __get_user(tmp, &sc->seg);                             \
+          loadsegment(seg,tmp); }
+
+#define FIX_EFLAGS      (X86_EFLAGS_AC | X86_EFLAGS_OF | X86_EFLAGS_DF | \
+                         X86_EFLAGS_TF | X86_EFLAGS_SF | X86_EFLAGS_ZF | \
+                         X86_EFLAGS_AF | X86_EFLAGS_PF | X86_EFLAGS_CF)
+
+        GET_SEG(gs);
+        GET_SEG(fs);
+        COPY_SEG(es);
+        COPY_SEG(ds);
+        COPY(edi);
+        COPY(esi);
+        COPY(ebp);
+        COPY(esp);
+        COPY(ebx);
+        COPY(edx);
+        COPY(ecx);
+        COPY(eip);
+        COPY_SEG_STRICT(cs);
+        COPY_SEG_STRICT(ss);
+        
+        {
+                unsigned int tmpflags;
+                err |= __get_user(tmpflags, &sc->eflags);
+                regs->eflags = (regs->eflags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
+                regs->orig_eax = -1;            /* disable syscall checks */
+        }
+
+        {
+                struct _fpstate __user * buf;
+                err |= __get_user(buf, &sc->fpstate);
+                if (buf) {
+                        if (!access_ok(VERIFY_READ, buf, sizeof(*buf)))
+                                goto badframe;
+                        err |= restore_i387(buf);
+                } else {
+                        struct task_struct *me = current;
+                        if (used_math()) {
+                                clear_fpu(me);
+                                clear_used_math();
+                        }
+                }
+        }
+
+        err |= __get_user(*peax, &sc->eax);
+        return err;
+
+badframe:
+        return 1;
+}
+
+asmlinkage int sys_sigreturn(unsigned long __unused)
+{
+        struct pt_regs *regs = (struct pt_regs *) &__unused;
+        struct sigframe __user *frame = (struct sigframe __user *)(regs->esp - 8);
+        sigset_t set;
+        int eax;
+
+        if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+                goto badframe;
+        if (__get_user(set.sig[0], &frame->sc.oldmask)
+            || (_NSIG_WORDS > 1
+                && __copy_from_user(&set.sig[1], &frame->extramask,
+                                    sizeof(frame->extramask))))
+                goto badframe;
+
+        sigdelsetmask(&set, ~_BLOCKABLE);
+        spin_lock_irq(&current->sighand->siglock);
+        current->blocked = set;
+        recalc_sigpending();
+        spin_unlock_irq(&current->sighand->siglock);
+        
+        if (restore_sigcontext(regs, &frame->sc, &eax))
+                goto badframe;
+        return eax;
+
+badframe:
+        force_sig(SIGSEGV, current);
+        return 0;
+}       
+
+asmlinkage int sys_rt_sigreturn(unsigned long __unused)
+{
+        struct pt_regs *regs = (struct pt_regs *) &__unused;
+        struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(regs->esp - 4);
+        sigset_t set;
+        int eax;
+
+        if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+                goto badframe;
+        if (__copy_from_user(&set, &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_sigcontext(regs, &frame->uc.uc_mcontext, &eax))
+                goto badframe;
+
+        if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->esp) == -EFAULT)
+                goto badframe;
+
+        return eax;
+
+badframe:
+        force_sig(SIGSEGV, current);
+        return 0;
+}       
+
+/*
+ * Set up a signal frame.
+ */
+
+static int
+setup_sigcontext(struct sigcontext __user *sc, struct _fpstate __user *fpstate,
+                 struct pt_regs *regs, unsigned long mask)
+{
+        int tmp, err = 0;
+
+        tmp = 0;
+        __asm__("movl %%gs,%0" : "=r"(tmp): "0"(tmp));
+        err |= __put_user(tmp, (unsigned int __user *)&sc->gs);
+        __asm__("movl %%fs,%0" : "=r"(tmp): "0"(tmp));
+        err |= __put_user(tmp, (unsigned int __user *)&sc->fs);
+
+        err |= __put_user(regs->xes, (unsigned int __user *)&sc->es);
+        err |= __put_user(regs->xds, (unsigned int __user *)&sc->ds);
+        err |= __put_user(regs->edi, &sc->edi);
+        err |= __put_user(regs->esi, &sc->esi);
+        err |= __put_user(regs->ebp, &sc->ebp);
+        err |= __put_user(regs->esp, &sc->esp);
+        err |= __put_user(regs->ebx, &sc->ebx);
+        err |= __put_user(regs->edx, &sc->edx);
+        err |= __put_user(regs->ecx, &sc->ecx);
+        err |= __put_user(regs->eax, &sc->eax);
+        err |= __put_user(current->thread.trap_no, &sc->trapno);
+        err |= __put_user(current->thread.error_code, &sc->err);
+        err |= __put_user(regs->eip, &sc->eip);
+        err |= __put_user(regs->xcs, (unsigned int __user *)&sc->cs);
+        err |= __put_user(regs->eflags, &sc->eflags);
+        err |= __put_user(regs->esp, &sc->esp_at_signal);
+        err |= __put_user(regs->xss, (unsigned int __user *)&sc->ss);
+
+        tmp = save_i387(fpstate);
+        if (tmp < 0)
+          err = 1;
+        else
+          err |= __put_user(tmp ? fpstate : NULL, &sc->fpstate);
+
+        /* non-iBCS2 extensions.. */
+        err |= __put_user(mask, &sc->oldmask);
+        err |= __put_user(current->thread.cr2, &sc->cr2);
+
+        return err;
+}
+
+/*
+ * 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 esp;
+
+        /* Default to using normal stack */
+        esp = regs->esp;
+
+        /* This is the X/Open sanctioned signal stack switching.  */
+        if (ka->sa.sa_flags & SA_ONSTACK) {
+                if (sas_ss_flags(esp) == 0)
+                        esp = current->sas_ss_sp + current->sas_ss_size;
+        }
+
+        /* This is the legacy signal stack switching. */
+        else if ((regs->xss & 0xffff) != __USER_DS &&
+                 !(ka->sa.sa_flags & SA_RESTORER) &&
+                 ka->sa.sa_restorer) {
+                esp = (unsigned long) ka->sa.sa_restorer;
+        }
+
+        return (void __user *)((esp - frame_size) & -8ul);
+}
+
+/* These symbols are defined with the addresses in the vsyscall page.
+   See vsyscall-sigreturn.S.  */
+extern void __user __kernel_sigreturn;
+extern void __user __kernel_rt_sigreturn;
+
+static void setup_frame(int sig, struct k_sigaction *ka,
+                        sigset_t *set, struct pt_regs * regs)
+{
+        void __user *restorer;
+        struct sigframe __user *frame;
+        int err = 0;
+        int usig;
+
+        frame = get_sigframe(ka, regs, sizeof(*frame));
+
+        if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+                goto give_sigsegv;
+
+        usig = current_thread_info()->exec_domain
+                && current_thread_info()->exec_domain->signal_invmap
+                && sig < 32
+                ? current_thread_info()->exec_domain->signal_invmap[sig]
+                : sig;
+
+        err = __put_user(usig, &frame->sig);
+        if (err)
+                goto give_sigsegv;
+
+        err = setup_sigcontext(&frame->sc, &frame->fpstate, regs, set->sig[0]);
+        if (err)
+                goto give_sigsegv;
+
+        if (_NSIG_WORDS > 1) {
+                err = __copy_to_user(&frame->extramask, &set->sig[1],
+                                      sizeof(frame->extramask));
+                if (err)
+                        goto give_sigsegv;
+        }
+
+        restorer = &__kernel_sigreturn;
+        if (ka->sa.sa_flags & SA_RESTORER)
+                restorer = ka->sa.sa_restorer;
+
+        /* Set up to return from userspace.  */
+        err |= __put_user(restorer, &frame->pretcode);
+         
+        /*
+         * 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 give_sigsegv;
+
+        /* Set up registers for signal handler */
+        regs->esp = (unsigned long) frame;
+        regs->eip = (unsigned long) ka->sa.sa_handler;
+        regs->eax = (unsigned long) sig;
+        regs->edx = (unsigned long) 0;
+        regs->ecx = (unsigned long) 0;
+
+        set_fs(USER_DS);
+        regs->xds = __USER_DS;
+        regs->xes = __USER_DS;
+        regs->xss = __USER_DS;
+        regs->xcs = __USER_CS;
+
+        /*
+         * Clear TF when entering the signal handler, but
+         * notify any tracer that was single-stepping it.
+         * The tracer may want to single-step inside the
+         * handler too.
+         */
+        regs->eflags &= ~TF_MASK;
+        if (test_thread_flag(TIF_SINGLESTEP))
+                ptrace_notify(SIGTRAP);
+
+#if DEBUG_SIG
+        printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
+                current->comm, current->pid, frame, regs->eip, frame->pretcode);
+#endif
+
+        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)
+{
+        void __user *restorer;
+        struct rt_sigframe __user *frame;
+        int err = 0;
+        int usig;
+
+        frame = get_sigframe(ka, regs, sizeof(*frame));
+
+        if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+                goto give_sigsegv;
+
+        usig = current_thread_info()->exec_domain
+                && current_thread_info()->exec_domain->signal_invmap
+                && sig < 32
+                ? current_thread_info()->exec_domain->signal_invmap[sig]
+                : sig;
+
+        err |= __put_user(usig, &frame->sig);
+        err |= __put_user(&frame->info, &frame->pinfo);
+        err |= __put_user(&frame->uc, &frame->puc);
+        err |= copy_siginfo_to_user(&frame->info, info);
+        if (err)
+                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(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
+        err |= __put_user(sas_ss_flags(regs->esp),
+                          &frame->uc.uc_stack.ss_flags);
+        err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
+        err |= setup_sigcontext(&frame->uc.uc_mcontext, &frame->fpstate,
+                                regs, set->sig[0]);
+        err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+        if (err)
+                goto give_sigsegv;
+
+        /* Set up to return from userspace.  */
+        restorer = &__kernel_rt_sigreturn;
+        if (ka->sa.sa_flags & SA_RESTORER)
+                restorer = ka->sa.sa_restorer;
+        err |= __put_user(restorer, &frame->pretcode);
+         
+        /*
+         * 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 give_sigsegv;
+
+        /* Set up registers for signal handler */
+        regs->esp = (unsigned long) frame;
+        regs->eip = (unsigned long) ka->sa.sa_handler;
+        regs->eax = (unsigned long) usig;
+        regs->edx = (unsigned long) &frame->info;
+        regs->ecx = (unsigned long) &frame->uc;
+
+        set_fs(USER_DS);
+        regs->xds = __USER_DS;
+        regs->xes = __USER_DS;
+        regs->xss = __USER_DS;
+        regs->xcs = __USER_CS;
+
+        /*
+         * Clear TF when entering the signal handler, but
+         * notify any tracer that was single-stepping it.
+         * The tracer may want to single-step inside the
+         * handler too.
+         */
+        regs->eflags &= ~TF_MASK;
+        if (test_thread_flag(TIF_SINGLESTEP))
+                ptrace_notify(SIGTRAP);
+
+#if DEBUG_SIG
+        printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
+                current->comm, current->pid, frame, regs->eip, frame->pretcode);
+#endif
+
+        return;
+
+give_sigsegv:
+        force_sigsegv(sig, current);
+}
+
+/*
+ * OK, we're invoking a handler
+ */     
+
+static void
+handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka,
+              sigset_t *oldset, struct pt_regs * regs)
+{
+        /* Are we from a system call? */
+        if (regs->orig_eax >= 0) {
+                /* If so, check system call restarting.. */
+                switch (regs->eax) {
+                        case -ERESTART_RESTARTBLOCK:
+                        case -ERESTARTNOHAND:
+                                regs->eax = -EINTR;
+                                break;
+
+                        case -ERESTARTSYS:
+                                if (!(ka->sa.sa_flags & SA_RESTART)) {
+                                        regs->eax = -EINTR;
+                                        break;
+                                }
+                        /* fallthrough */
+                        case -ERESTARTNOINTR:
+                                regs->eax = regs->orig_eax;
+                                regs->eip -= 2;
+                }
+        }
+
+        /*
+         * If TF is set due to a debugger (PT_DTRACE), clear the TF flag so
+         * that register information in the sigcontext is correct.
+         */
+        if (unlikely(regs->eflags & TF_MASK)
+            && likely(current->ptrace & PT_DTRACE)) {
+                current->ptrace &= ~PT_DTRACE;
+                regs->eflags &= ~TF_MASK;
+        }
+
+        /* 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.
+ */
+int fastcall do_signal(struct pt_regs *regs, sigset_t *oldset)
+{
+        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 ((regs->xcs & 3) != 3)
+                return 1;
+
+        if (current->flags & PF_FREEZE) {
+                refrigerator(0);
+                goto no_signal;
+        }
+
+        if (!oldset)
+                oldset = &current->blocked;
+
+        signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+        if (signr > 0) {
+                /* Reenable any watchpoints before delivering the
+                 * signal to user space. The processor register will
+                 * have been cleared if the watchpoint triggered
+                 * inside the kernel.
+                 */
+                if (unlikely(current->thread.debugreg[7])) {
+                        __asm__("movl %0,%%db7" : : "r" (current->thread.debugreg[7]));
+                }
+
+                /* Whee!  Actually deliver the signal.  */
+                handle_signal(signr, &info, &ka, oldset, regs);
+                return 1;
+        }
+
+ no_signal:
+        /* Did we come from a system call? */
+        if (regs->orig_eax >= 0) {
+                /* Restart the system call - no handlers present */
+                if (regs->eax == -ERESTARTNOHAND ||
+                    regs->eax == -ERESTARTSYS ||
+                    regs->eax == -ERESTARTNOINTR) {
+                        regs->eax = regs->orig_eax;
+                        regs->eip -= 2;
+                }
+                if (regs->eax == -ERESTART_RESTARTBLOCK){
+                        regs->eax = __NR_restart_syscall;
+                        regs->eip -= 2;
+                }
+        }
+        return 0;
+}
+
+/*
+ * notification of userspace execution resumption
+ * - triggered by current->work.notify_resume
+ */
+__attribute__((regparm(3)))
+void do_notify_resume(struct pt_regs *regs, sigset_t *oldset,
+                      __u32 thread_info_flags)
+{
+        /* Pending single-step? */
+        if (thread_info_flags & _TIF_SINGLESTEP) {
+                regs->eflags |= TF_MASK;
+                clear_thread_flag(TIF_SINGLESTEP);
+        }
+        /* deal with pending signal delivery */
+        if (thread_info_flags & _TIF_SIGPENDING)
+                do_signal(regs,oldset);
+        
+        clear_thread_flag(TIF_IRET);
+}