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, 486 insertions, 0 deletions

diff --git a/arch/x86_64/kernel/signal.c b/arch/x86_64/kernel/signal.c
new file mode 100644
index 000000000000..5ace32c6ac5c
--- /dev/null
+++ b/arch/x86_64/kernel/signal.c
@@ -0,0 +1,486 @@
+/*
+ *  linux/arch/x86_64/kernel/signal.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *  Copyright (C) 2000, 2001, 2002 Andi Kleen SuSE Labs
+ *
+ *  1997-11-28  Modified for POSIX.1b signals by Richard Henderson
+ *  2000-06-20  Pentium III FXSR, SSE support by Gareth Hughes
+ *  2000-2002   x86-64 support by Andi Kleen
+ * 
+ *  $Id: signal.c,v 1.18 2001/10/17 22:30:37 ak Exp $
+ */
+
+#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/personality.h>
+#include <linux/compiler.h>
+#include <asm/ucontext.h>
+#include <asm/uaccess.h>
+#include <asm/i387.h>
+#include <asm/proto.h>
+
+/* #define DEBUG_SIG 1 */
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+void ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+               sigset_t *set, struct pt_regs * regs); 
+void ia32_setup_frame(int sig, struct k_sigaction *ka,
+            sigset_t *set, struct pt_regs * regs); 
+
+asmlinkage long
+sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, struct pt_regs *regs)
+{
+        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);
+#ifdef DEBUG_SIG
+        printk("rt_sigsuspend savset(%lx) newset(%lx) regs(%p) rip(%lx)\n",
+                saveset, newset, regs, regs->rip);
+#endif 
+        regs->rax = -EINTR;
+        while (1) {
+                current->state = TASK_INTERRUPTIBLE;
+                schedule();
+                if (do_signal(regs, &saveset))
+                        return -EINTR;
+        }
+}
+
+asmlinkage long
+sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
+                struct pt_regs *regs)
+{
+        return do_sigaltstack(uss, uoss, regs->rsp);
+}
+
+
+/*
+ * Do a signal return; undo the signal stack.
+ */
+
+struct rt_sigframe
+{
+        char *pretcode;
+        struct ucontext uc;
+        struct siginfo info;
+};
+
+static int
+restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc, unsigned long *prax)
+{
+        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)
+
+        COPY(rdi); COPY(rsi); COPY(rbp); COPY(rsp); COPY(rbx);
+        COPY(rdx); COPY(rcx); COPY(rip);
+        COPY(r8);
+        COPY(r9);
+        COPY(r10);
+        COPY(r11);
+        COPY(r12);
+        COPY(r13);
+        COPY(r14);
+        COPY(r15);
+
+        {
+                unsigned int tmpflags;
+                err |= __get_user(tmpflags, &sc->eflags);
+                regs->eflags = (regs->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
+                regs->orig_rax = -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(*prax, &sc->rax);
+        return err;
+
+badframe:
+        return 1;
+}
+
+asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
+{
+        struct rt_sigframe __user *frame;
+        sigset_t set;
+        unsigned long eax;
+
+        frame = (struct rt_sigframe __user *)(regs->rsp - 8);
+        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;
+
+#ifdef DEBUG_SIG
+        printk("%d sigreturn rip:%lx rsp:%lx frame:%p rax:%lx\n",current->pid,regs.rip,regs.rsp,frame,eax);
+#endif
+
+        if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->rsp) == -EFAULT)
+                goto badframe;
+
+        return eax;
+
+badframe:
+        signal_fault(regs,frame,"sigreturn");
+        return 0;
+}       
+
+/*
+ * Set up a signal frame.
+ */
+
+static inline int
+setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs, unsigned long mask, struct task_struct *me)
+{
+        int err = 0;
+        unsigned long eflags;
+
+        err |= __put_user(0, &sc->gs);
+        err |= __put_user(0, &sc->fs);
+
+        err |= __put_user(regs->rdi, &sc->rdi);
+        err |= __put_user(regs->rsi, &sc->rsi);
+        err |= __put_user(regs->rbp, &sc->rbp);
+        err |= __put_user(regs->rsp, &sc->rsp);
+        err |= __put_user(regs->rbx, &sc->rbx);
+        err |= __put_user(regs->rdx, &sc->rdx);
+        err |= __put_user(regs->rcx, &sc->rcx);
+        err |= __put_user(regs->rax, &sc->rax);
+        err |= __put_user(regs->r8, &sc->r8);
+        err |= __put_user(regs->r9, &sc->r9);
+        err |= __put_user(regs->r10, &sc->r10);
+        err |= __put_user(regs->r11, &sc->r11);
+        err |= __put_user(regs->r12, &sc->r12);
+        err |= __put_user(regs->r13, &sc->r13);
+        err |= __put_user(regs->r14, &sc->r14);
+        err |= __put_user(regs->r15, &sc->r15);
+        err |= __put_user(me->thread.trap_no, &sc->trapno);
+        err |= __put_user(me->thread.error_code, &sc->err);
+        err |= __put_user(regs->rip, &sc->rip);
+        eflags = regs->eflags;
+        if (current->ptrace & PT_PTRACED) {
+                eflags &= ~TF_MASK;
+        }
+        err |= __put_user(eflags, &sc->eflags);
+        err |= __put_user(mask, &sc->oldmask);
+        err |= __put_user(me->thread.cr2, &sc->cr2);
+
+        return err;
+}
+
+/*
+ * Determine which stack to use..
+ */
+
+static void __user *
+get_stack(struct k_sigaction *ka, struct pt_regs *regs, unsigned long size)
+{
+        unsigned long rsp;
+
+        /* Default to using normal stack - redzone*/
+        rsp = regs->rsp - 128;
+
+        /* This is the X/Open sanctioned signal stack switching.  */
+        /* RED-PEN: redzone on that stack? */
+        if (ka->sa.sa_flags & SA_ONSTACK) {
+                if (sas_ss_flags(rsp) == 0)
+                        rsp = current->sas_ss_sp + current->sas_ss_size;
+        }
+
+        return (void __user *)round_down(rsp - size, 16); 
+}
+
+static void setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+                           sigset_t *set, struct pt_regs * regs)
+{
+        struct rt_sigframe __user *frame;
+        struct _fpstate __user *fp = NULL; 
+        int err = 0;
+        struct task_struct *me = current;
+
+        if (used_math()) {
+                fp = get_stack(ka, regs, sizeof(struct _fpstate)); 
+                frame = (void __user *)round_down(
+                        (unsigned long)fp - sizeof(struct rt_sigframe), 16) - 8;
+
+                if (!access_ok(VERIFY_WRITE, fp, sizeof(struct _fpstate)))
+                        goto give_sigsegv;
+
+                if (save_i387(fp) < 0) 
+                        err |= -1; 
+        } else
+                frame = get_stack(ka, regs, sizeof(struct rt_sigframe)) - 8;
+
+        if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+                goto give_sigsegv;
+
+        if (ka->sa.sa_flags & SA_SIGINFO) { 
+                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(me->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
+        err |= __put_user(sas_ss_flags(regs->rsp),
+                          &frame->uc.uc_stack.ss_flags);
+        err |= __put_user(me->sas_ss_size, &frame->uc.uc_stack.ss_size);
+        err |= setup_sigcontext(&frame->uc.uc_mcontext, regs, set->sig[0], me);
+        err |= __put_user(fp, &frame->uc.uc_mcontext.fpstate);
+        if (sizeof(*set) == 16) { 
+                __put_user(set->sig[0], &frame->uc.uc_sigmask.sig[0]);
+                __put_user(set->sig[1], &frame->uc.uc_sigmask.sig[1]); 
+        } else
+                err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+
+        /* Set up to return from userspace.  If provided, use a stub
+           already in userspace.  */
+        /* x86-64 should always use SA_RESTORER. */
+        if (ka->sa.sa_flags & SA_RESTORER) {
+                err |= __put_user(ka->sa.sa_restorer, &frame->pretcode);
+        } else {
+                /* could use a vstub here */
+                goto give_sigsegv; 
+        }
+
+        if (err)
+                goto give_sigsegv;
+
+#ifdef DEBUG_SIG
+        printk("%d old rip %lx old rsp %lx old rax %lx\n", current->pid,regs->rip,regs->rsp,regs->rax);
+#endif
+
+        /* Set up registers for signal handler */
+        { 
+                struct exec_domain *ed = current_thread_info()->exec_domain;
+                if (unlikely(ed && ed->signal_invmap && sig < 32))
+                        sig = ed->signal_invmap[sig];
+        } 
+        regs->rdi = sig;
+        /* In case the signal handler was declared without prototypes */ 
+        regs->rax = 0;  
+
+        /* This also works for non SA_SIGINFO handlers because they expect the
+           next argument after the signal number on the stack. */
+        regs->rsi = (unsigned long)&frame->info; 
+        regs->rdx = (unsigned long)&frame->uc; 
+        regs->rip = (unsigned long) ka->sa.sa_handler;
+
+        regs->rsp = (unsigned long)frame;
+
+        set_fs(USER_DS);
+        if (regs->eflags & TF_MASK) {
+                if ((current->ptrace & (PT_PTRACED | PT_DTRACE)) == (PT_PTRACED | PT_DTRACE)) {
+                        ptrace_notify(SIGTRAP);
+                } else {
+                        regs->eflags &= ~TF_MASK;
+                }
+        }
+
+#ifdef DEBUG_SIG
+        printk("SIG deliver (%s:%d): sp=%p pc=%p ra=%p\n",
+                current->comm, current->pid, frame, regs->rip, 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)
+{
+#ifdef DEBUG_SIG
+        printk("handle_signal pid:%d sig:%lu rip:%lx rsp:%lx regs=%p\n",
+                current->pid, sig,
+                regs->rip, regs->rsp, regs);
+#endif
+
+        /* Are we from a system call? */
+        if ((long)regs->orig_rax >= 0) {
+                /* If so, check system call restarting.. */
+                switch (regs->rax) {
+                        case -ERESTART_RESTARTBLOCK:
+                        case -ERESTARTNOHAND:
+                                regs->rax = -EINTR;
+                                break;
+
+                        case -ERESTARTSYS:
+                                if (!(ka->sa.sa_flags & SA_RESTART)) {
+                                        regs->rax = -EINTR;
+                                        break;
+                                }
+                                /* fallthrough */
+                        case -ERESTARTNOINTR:
+                                regs->rax = regs->orig_rax;
+                                regs->rip -= 2;
+                                break;
+                }
+        }
+
+#ifdef CONFIG_IA32_EMULATION
+        if (test_thread_flag(TIF_IA32)) {
+                if (ka->sa.sa_flags & SA_SIGINFO)
+                        ia32_setup_rt_frame(sig, ka, info, oldset, regs);
+                else
+                        ia32_setup_frame(sig, ka, oldset, regs);
+        } else 
+#endif
+        setup_rt_frame(sig, ka, info, 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 do_signal(struct pt_regs *regs, sigset_t *oldset)
+{
+        struct k_sigaction ka;
+        siginfo_t info;
+        int signr;
+
+        /*
+         * 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->cs & 3) != 3)
+                return 1;
+
+        if (try_to_freeze(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 (current->thread.debugreg7)
+                        asm volatile("movq %0,%%db7"    : : "r" (current->thread.debugreg7));
+
+                /* Whee!  Actually deliver the signal.  */
+                handle_signal(signr, &info, &ka, oldset, regs);
+                return 1;
+        }
+
+ no_signal:
+        /* Did we come from a system call? */
+        if ((long)regs->orig_rax >= 0) {
+                /* Restart the system call - no handlers present */
+                long res = regs->rax;
+                if (res == -ERESTARTNOHAND ||
+                    res == -ERESTARTSYS ||
+                    res == -ERESTARTNOINTR) {
+                        regs->rax = regs->orig_rax;
+                        regs->rip -= 2;
+                }
+                if (regs->rax == (unsigned long)-ERESTART_RESTARTBLOCK) {
+                        regs->rax = __NR_restart_syscall;
+                        regs->rip -= 2;
+                }
+        }
+        return 0;
+}
+
+void do_notify_resume(struct pt_regs *regs, sigset_t *oldset, __u32 thread_info_flags)
+{
+#ifdef DEBUG_SIG
+        printk("do_notify_resume flags:%x rip:%lx rsp:%lx caller:%lx pending:%lx\n",
+               thread_info_flags, regs->rip, regs->rsp, __builtin_return_address(0),signal_pending(current)); 
+#endif
+               
+        /* 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);
+}
+
+void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
+{ 
+        struct task_struct *me = current; 
+        if (exception_trace)
+                printk("%s[%d] bad frame in %s frame:%p rip:%lx rsp:%lx orax:%lx\n",
+               me->comm,me->pid,where,frame,regs->rip,regs->rsp,regs->orig_rax); 
+
+        force_sig(SIGSEGV, me); 
+}