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, 621 insertions, 0 deletions

diff --git a/arch/x86_64/ia32/ia32_signal.c b/arch/x86_64/ia32/ia32_signal.c
new file mode 100644
index 000000000000..fbd09b5126ce
--- /dev/null
+++ b/arch/x86_64/ia32/ia32_signal.c
@@ -0,0 +1,621 @@
+/*
+ *  linux/arch/x86_64/ia32/ia32_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
+ *  2000-12-*   x86-64 compatibility mode signal handling by Andi Kleen
+ * 
+ *  $Id: ia32_signal.c,v 1.22 2002/07/29 10:34:03 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/compat.h>
+#include <asm/ucontext.h>
+#include <asm/uaccess.h>
+#include <asm/i387.h>
+#include <asm/ia32.h>
+#include <asm/ptrace.h>
+#include <asm/ia32_unistd.h>
+#include <asm/user32.h>
+#include <asm/sigcontext32.h>
+#include <asm/fpu32.h>
+#include <asm/proto.h>
+#include <asm/vsyscall32.h>
+
+#define DEBUG_SIG 0
+
+#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
+
+asmlinkage int do_signal(struct pt_regs *regs, sigset_t *oldset);
+void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
+
+int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from)
+{
+        int err;
+        if (!access_ok (VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
+                return -EFAULT;
+
+        /* If you change siginfo_t structure, please make sure that
+           this code is fixed accordingly.
+           It should never copy any pad contained in the structure
+           to avoid security leaks, but must copy the generic
+           3 ints plus the relevant union member.  */
+        err = __put_user(from->si_signo, &to->si_signo);
+        err |= __put_user(from->si_errno, &to->si_errno);
+        err |= __put_user((short)from->si_code, &to->si_code);
+
+        if (from->si_code < 0) {
+                err |= __put_user(from->si_pid, &to->si_pid);
+                err |= __put_user(from->si_uid, &to->si_uid);
+                err |= __put_user(ptr_to_compat(from->si_ptr), &to->si_ptr);
+        } else {
+                /* First 32bits of unions are always present:
+                 * si_pid === si_band === si_tid === si_addr(LS half) */
+                err |= __put_user(from->_sifields._pad[0], &to->_sifields._pad[0]);
+                switch (from->si_code >> 16) {
+                case __SI_FAULT >> 16:
+                        break;
+                case __SI_CHLD >> 16:
+                        err |= __put_user(from->si_utime, &to->si_utime);
+                        err |= __put_user(from->si_stime, &to->si_stime);
+                        err |= __put_user(from->si_status, &to->si_status);
+                        /* FALL THROUGH */
+                default:
+                case __SI_KILL >> 16:
+                        err |= __put_user(from->si_uid, &to->si_uid);
+                        break;
+                case __SI_POLL >> 16:
+                        err |= __put_user(from->si_fd, &to->si_fd); 
+                        break;
+                case __SI_TIMER >> 16:
+                        err |= __put_user(from->si_overrun, &to->si_overrun); 
+                        err |= __put_user(ptr_to_compat(from->si_ptr),
+                                        &to->si_ptr);
+                        break;
+                case __SI_RT >> 16: /* This is not generated by the kernel as of now.  */
+                case __SI_MESGQ >> 16:
+                        err |= __put_user(from->si_uid, &to->si_uid);
+                        err |= __put_user(from->si_int, &to->si_int);
+                        break;
+                }
+        }
+        return err;
+}
+
+int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
+{
+        int err;
+        u32 ptr32;
+        if (!access_ok (VERIFY_READ, from, sizeof(compat_siginfo_t)))
+                return -EFAULT;
+
+        err = __get_user(to->si_signo, &from->si_signo);
+        err |= __get_user(to->si_errno, &from->si_errno);
+        err |= __get_user(to->si_code, &from->si_code);
+
+        err |= __get_user(to->si_pid, &from->si_pid);
+        err |= __get_user(to->si_uid, &from->si_uid);
+        err |= __get_user(ptr32, &from->si_ptr);
+        to->si_ptr = compat_ptr(ptr32);
+
+        return err;
+}
+
+asmlinkage long
+sys32_sigsuspend(int history0, int history1, old_sigset_t mask,
+                 struct pt_regs *regs)
+{
+        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->rax = -EINTR;
+        while (1) {
+                current->state = TASK_INTERRUPTIBLE;
+                schedule();
+                if (do_signal(regs, &saveset))
+                        return -EINTR;
+        }
+}
+
+asmlinkage long
+sys32_sigaltstack(const stack_ia32_t __user *uss_ptr,
+                  stack_ia32_t __user *uoss_ptr, 
+                  struct pt_regs *regs)
+{
+        stack_t uss,uoss; 
+        int ret;
+        mm_segment_t seg; 
+        if (uss_ptr) { 
+                u32 ptr;
+                memset(&uss,0,sizeof(stack_t));
+                if (!access_ok(VERIFY_READ,uss_ptr,sizeof(stack_ia32_t)) ||
+                            __get_user(ptr, &uss_ptr->ss_sp) ||
+                            __get_user(uss.ss_flags, &uss_ptr->ss_flags) ||
+                            __get_user(uss.ss_size, &uss_ptr->ss_size))
+                        return -EFAULT;
+                uss.ss_sp = compat_ptr(ptr);
+        }
+        seg = get_fs(); 
+        set_fs(KERNEL_DS); 
+        ret = do_sigaltstack(uss_ptr ? &uss : NULL, &uoss, regs->rsp);
+        set_fs(seg); 
+        if (ret >= 0 && uoss_ptr)  {
+                if (!access_ok(VERIFY_WRITE,uoss_ptr,sizeof(stack_ia32_t)) ||
+                    __put_user(ptr_to_compat(uoss.ss_sp), &uoss_ptr->ss_sp) ||
+                    __put_user(uoss.ss_flags, &uoss_ptr->ss_flags) ||
+                    __put_user(uoss.ss_size, &uoss_ptr->ss_size))
+                        ret = -EFAULT;
+        }       
+        return ret;     
+}
+
+/*
+ * Do a signal return; undo the signal stack.
+ */
+
+struct sigframe
+{
+        u32 pretcode;
+        int sig;
+        struct sigcontext_ia32 sc;
+        struct _fpstate_ia32 fpstate;
+        unsigned int extramask[_COMPAT_NSIG_WORDS-1];
+        char retcode[8];
+};
+
+struct rt_sigframe
+{
+        u32 pretcode;
+        int sig;
+        u32 pinfo;
+        u32 puc;
+        compat_siginfo_t info;
+        struct ucontext_ia32 uc;
+        struct _fpstate_ia32 fpstate;
+        char retcode[8];
+};
+
+static int
+ia32_restore_sigcontext(struct pt_regs *regs, struct sigcontext_ia32 __user *sc, unsigned 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;
+
+#if DEBUG_SIG
+        printk("SIG restore_sigcontext: sc=%p err(%x) eip(%x) cs(%x) flg(%x)\n",
+                sc, sc->err, sc->eip, sc->cs, sc->eflags);
+#endif
+#define COPY(x)         { \
+        unsigned int reg;                       \
+        err |= __get_user(reg, &sc->e ##x);     \
+        regs->r ## x = reg;                     \
+}
+
+#define RELOAD_SEG(seg,mask)                                            \
+        { unsigned int cur;                                             \
+          unsigned short pre;                                           \
+          err |= __get_user(pre, &sc->seg);                             \
+          asm volatile("movl %%" #seg ",%0" : "=r" (cur));              \
+          pre |= mask;                                                  \
+          if (pre != cur) loadsegment(seg,pre); }
+
+        /* Reload fs and gs if they have changed in the signal handler.
+           This does not handle long fs/gs base changes in the handler, but 
+           does not clobber them at least in the normal case. */ 
+        
+        {
+                unsigned gs, oldgs; 
+                err |= __get_user(gs, &sc->gs);
+                gs |= 3; 
+                asm("movl %%gs,%0" : "=r" (oldgs));
+                if (gs != oldgs)
+                load_gs_index(gs); 
+        } 
+        RELOAD_SEG(fs,3);
+        RELOAD_SEG(ds,3);
+        RELOAD_SEG(es,3);
+
+        COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
+        COPY(dx); COPY(cx); COPY(ip);
+        /* Don't touch extended registers */ 
+        
+        err |= __get_user(regs->cs, &sc->cs); 
+        regs->cs |= 3;  
+        err |= __get_user(regs->ss, &sc->ss); 
+        regs->ss |= 3; 
+
+        {
+                unsigned int tmpflags;
+                err |= __get_user(tmpflags, &sc->eflags);
+                regs->eflags = (regs->eflags & ~0x40DD5) | (tmpflags & 0x40DD5);
+                regs->orig_rax = -1;            /* disable syscall checks */
+        }
+
+        {
+                u32 tmp;
+                struct _fpstate_ia32 __user * buf;
+                err |= __get_user(tmp, &sc->fpstate);
+                buf = compat_ptr(tmp);
+                if (buf) {
+                        if (!access_ok(VERIFY_READ, buf, sizeof(*buf)))
+                                goto badframe;
+                        err |= restore_i387_ia32(current, buf, 0);
+                } else {
+                        struct task_struct *me = current;
+                        if (used_math()) {
+                                clear_fpu(me);
+                                clear_used_math();
+                        }
+                }
+        }
+
+        { 
+                u32 tmp;
+                err |= __get_user(tmp, &sc->eax);
+                *peax = tmp;
+        }
+        return err;
+
+badframe:
+        return 1;
+}
+
+asmlinkage long sys32_sigreturn(struct pt_regs *regs)
+{
+        struct sigframe __user *frame = (struct sigframe __user *)(regs->rsp-8);
+        sigset_t set;
+        unsigned int eax;
+
+        if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
+                goto badframe;
+        if (__get_user(set.sig[0], &frame->sc.oldmask)
+            || (_COMPAT_NSIG_WORDS > 1
+                && __copy_from_user((((char *) &set.sig) + 4), &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 (ia32_restore_sigcontext(regs, &frame->sc, &eax))
+                goto badframe;
+        return eax;
+
+badframe:
+        signal_fault(regs, frame, "32bit sigreturn");
+        return 0;
+}       
+
+asmlinkage long sys32_rt_sigreturn(struct pt_regs *regs)
+{
+        struct rt_sigframe __user *frame;
+        sigset_t set;
+        unsigned int eax;
+        struct pt_regs tregs;
+
+        frame = (struct rt_sigframe __user *)(regs->rsp - 4);
+
+        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 (ia32_restore_sigcontext(regs, &frame->uc.uc_mcontext, &eax))
+                goto badframe;
+
+        tregs = *regs;
+        if (sys32_sigaltstack(&frame->uc.uc_stack, NULL, &tregs) == -EFAULT)
+                goto badframe;
+
+        return eax;
+
+badframe:
+        signal_fault(regs,frame,"32bit rt sigreturn");
+        return 0;
+}       
+
+/*
+ * Set up a signal frame.
+ */
+
+static int
+ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc, struct _fpstate_ia32 __user *fpstate,
+                 struct pt_regs *regs, unsigned int mask)
+{
+        int tmp, err = 0;
+        u32 eflags;
+
+        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);
+        __asm__("movl %%ds,%0" : "=r"(tmp): "0"(tmp));
+        err |= __put_user(tmp, (unsigned int __user *)&sc->ds);
+        __asm__("movl %%es,%0" : "=r"(tmp): "0"(tmp));
+        err |= __put_user(tmp, (unsigned int __user *)&sc->es);
+
+        err |= __put_user((u32)regs->rdi, &sc->edi);
+        err |= __put_user((u32)regs->rsi, &sc->esi);
+        err |= __put_user((u32)regs->rbp, &sc->ebp);
+        err |= __put_user((u32)regs->rsp, &sc->esp);
+        err |= __put_user((u32)regs->rbx, &sc->ebx);
+        err |= __put_user((u32)regs->rdx, &sc->edx);
+        err |= __put_user((u32)regs->rcx, &sc->ecx);
+        err |= __put_user((u32)regs->rax, &sc->eax);
+        err |= __put_user((u32)regs->cs, &sc->cs);
+        err |= __put_user((u32)regs->ss, &sc->ss);
+        err |= __put_user(current->thread.trap_no, &sc->trapno);
+        err |= __put_user(current->thread.error_code, &sc->err);
+        err |= __put_user((u32)regs->rip, &sc->eip);
+        eflags = regs->eflags;
+        if (current->ptrace & PT_PTRACED)
+                eflags &= ~TF_MASK;
+        err |= __put_user((u32)eflags, &sc->eflags);
+        err |= __put_user((u32)regs->rsp, &sc->esp_at_signal);
+
+        tmp = save_i387_ia32(current, fpstate, regs, 0);
+        if (tmp < 0)
+                err = -EFAULT;
+        else { 
+                clear_used_math();
+                stts();
+                err |= __put_user(ptr_to_compat(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 void __user *
+get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
+{
+        unsigned long rsp;
+
+        /* Default to using normal stack */
+        rsp = regs->rsp;
+
+        /* This is the X/Open sanctioned signal stack switching.  */
+        if (ka->sa.sa_flags & SA_ONSTACK) {
+                if (sas_ss_flags(rsp) == 0)
+                        rsp = current->sas_ss_sp + current->sas_ss_size;
+        }
+
+        /* This is the legacy signal stack switching. */
+        else if ((regs->ss & 0xffff) != __USER_DS &&
+                !(ka->sa.sa_flags & SA_RESTORER) &&
+                 ka->sa.sa_restorer) {
+                rsp = (unsigned long) ka->sa.sa_restorer;
+        }
+
+        return (void __user *)((rsp - frame_size) & -8UL);
+}
+
+void ia32_setup_frame(int sig, struct k_sigaction *ka,
+                        compat_sigset_t *set, struct pt_regs * regs)
+{
+        struct sigframe __user *frame;
+        int err = 0;
+
+        frame = get_sigframe(ka, regs, sizeof(*frame));
+
+        if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+                goto give_sigsegv;
+
+        {
+                struct exec_domain *ed = current_thread_info()->exec_domain;
+                err |= __put_user((ed
+                           && ed->signal_invmap
+                           && sig < 32
+                           ? ed->signal_invmap[sig]
+                           : sig),
+                          &frame->sig);
+        }
+        if (err)
+                goto give_sigsegv;
+
+        err |= ia32_setup_sigcontext(&frame->sc, &frame->fpstate, regs,
+                                        set->sig[0]);
+        if (err)
+                goto give_sigsegv;
+
+        if (_COMPAT_NSIG_WORDS > 1) {
+                err |= __copy_to_user(frame->extramask, &set->sig[1],
+                                      sizeof(frame->extramask));
+        }
+        if (err)
+                goto give_sigsegv;
+
+        /* Return stub is in 32bit vsyscall page */
+        { 
+                void __user *restorer = VSYSCALL32_SIGRETURN; 
+                if (ka->sa.sa_flags & SA_RESTORER)
+                        restorer = ka->sa.sa_restorer;       
+                err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);
+        }
+        /* These are actually not used anymore, but left because some 
+           gdb versions depend on them as a marker. */
+        { 
+                /* copy_to_user optimizes that into a single 8 byte store */
+                static const struct { 
+                        u16 poplmovl;
+                        u32 val;
+                        u16 int80;    
+                        u16 pad; 
+                } __attribute__((packed)) code = { 
+                        0xb858,          /* popl %eax ; movl $...,%eax */
+                        __NR_ia32_sigreturn,   
+                        0x80cd,         /* int $0x80 */
+                        0,
+                }; 
+                err |= __copy_to_user(frame->retcode, &code, 8); 
+        }
+        if (err)
+                goto give_sigsegv;
+
+        /* Set up registers for signal handler */
+        regs->rsp = (unsigned long) frame;
+        regs->rip = (unsigned long) ka->sa.sa_handler;
+
+        asm volatile("movl %0,%%ds" :: "r" (__USER32_DS)); 
+        asm volatile("movl %0,%%es" :: "r" (__USER32_DS)); 
+
+        regs->cs = __USER32_CS; 
+        regs->ss = __USER32_DS; 
+
+        set_fs(USER_DS);
+        if (regs->eflags & TF_MASK) {
+                if (current->ptrace & PT_PTRACED) {
+                        ptrace_notify(SIGTRAP);
+                } else {
+                        regs->eflags &= ~TF_MASK;
+                }
+        }
+
+#if 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);
+}
+
+void ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
+                           compat_sigset_t *set, struct pt_regs * regs)
+{
+        struct rt_sigframe __user *frame;
+        int err = 0;
+
+        frame = get_sigframe(ka, regs, sizeof(*frame));
+
+        if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+                goto give_sigsegv;
+
+        {
+                struct exec_domain *ed = current_thread_info()->exec_domain;
+                err |= __put_user((ed
+                           && ed->signal_invmap
+                           && sig < 32
+                           ? ed->signal_invmap[sig]
+                           : sig),
+                          &frame->sig);
+        }
+        err |= __put_user(ptr_to_compat(&frame->info), &frame->pinfo);
+        err |= __put_user(ptr_to_compat(&frame->uc), &frame->puc);
+        err |= copy_siginfo_to_user32(&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->rsp),
+                          &frame->uc.uc_stack.ss_flags);
+        err |= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
+        err |= ia32_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;
+
+        
+        { 
+                void __user *restorer = VSYSCALL32_RTSIGRETURN; 
+                if (ka->sa.sa_flags & SA_RESTORER)
+                        restorer = ka->sa.sa_restorer;       
+                err |= __put_user(ptr_to_compat(restorer), &frame->pretcode);
+        }
+
+        /* This is movl $,%eax ; int $0x80 */
+        /* Not actually used anymore, but left because some gdb versions
+           need it. */ 
+        { 
+                /* __copy_to_user optimizes that into a single 8 byte store */
+                static const struct { 
+                        u8 movl; 
+                        u32 val; 
+                        u16 int80; 
+                        u16 pad;
+                        u8  pad2;                               
+                } __attribute__((packed)) code = { 
+                        0xb8,
+                        __NR_ia32_rt_sigreturn,
+                        0x80cd,
+                        0,
+                }; 
+                err |= __copy_to_user(frame->retcode, &code, 8); 
+        } 
+        if (err)
+                goto give_sigsegv;
+
+        /* Set up registers for signal handler */
+        regs->rsp = (unsigned long) frame;
+        regs->rip = (unsigned long) ka->sa.sa_handler;
+
+        asm volatile("movl %0,%%ds" :: "r" (__USER32_DS)); 
+        asm volatile("movl %0,%%es" :: "r" (__USER32_DS)); 
+        
+        regs->cs = __USER32_CS; 
+        regs->ss = __USER32_DS; 
+
+        set_fs(USER_DS);
+        if (regs->eflags & TF_MASK) {
+                if (current->ptrace & PT_PTRACED) {
+                        ptrace_notify(SIGTRAP);
+                } else {
+                        regs->eflags &= ~TF_MASK;
+                }
+        }
+
+#if 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);
+}
+