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[/] [test_project/] [trunk/] [linux_sd_driver/] [arch/] [s390/] [kernel/] [signal.c] - Blame information for rev 63

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/*
 *  arch/s390/kernel/signal.c
 *
 *    Copyright (C) IBM Corp. 1999,2006
 *    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/sched.h>
#include <linux/mm.h>
#include <linux/smp.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;
 
/*
 * Atomically swap in the new signal mask, and wait for a signal.
 */
asmlinkage int
sys_sigsuspend(int history0, int history1, old_sigset_t mask)
{
        mask &= _BLOCKABLE;
        spin_lock_irq(&current->sighand->siglock);
        current->saved_sigmask = current->blocked;
        siginitset(&current->blocked, mask);
        recalc_sigpending();
        spin_unlock_irq(&current->sighand->siglock);
 
        current->state = TASK_INTERRUPTIBLE;
        schedule();
        set_thread_flag(TIF_RESTORE_SIGMASK);
 
        return -ERESTARTNOHAND;
}
 
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) ||
                    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
                    __get_user(mask, &act->sa_mask))
                        return -EFAULT;
                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) ||
                    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
                    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
                        return -EFAULT;
        }
 
        return ret;
}
 
asmlinkage long
sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss)
{
        struct pt_regs *regs = task_pt_regs(current);
        return do_sigaltstack(uss, uoss, regs->gprs[15]);
}
 
 
 
/* Returns non-zero on fault. */
static int save_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
{
        _sigregs user_sregs;
 
        save_access_regs(current->thread.acrs);
 
        /* Copy a 'clean' PSW mask to the user to avoid leaking
           information about whether PER is currently on.  */
        user_sregs.regs.psw.mask = PSW_MASK_MERGE(psw_user_bits, regs->psw.mask);
        user_sregs.regs.psw.addr = regs->psw.addr;
        memcpy(&user_sregs.regs.gprs, &regs->gprs, sizeof(sregs->regs.gprs));
        memcpy(&user_sregs.regs.acrs, current->thread.acrs,
               sizeof(sregs->regs.acrs));
        /*
         * 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);
        memcpy(&user_sregs.fpregs, &current->thread.fp_regs,
               sizeof(s390_fp_regs));
        return __copy_to_user(sregs, &user_sregs, sizeof(_sigregs));
}
 
/* Returns positive number on error */
static int restore_sigregs(struct pt_regs *regs, _sigregs __user *sregs)
{
        int err;
        _sigregs user_sregs;
 
        /* Alwys make any pending restarted system call return -EINTR */
        current_thread_info()->restart_block.fn = do_no_restart_syscall;
 
        err = __copy_from_user(&user_sregs, sregs, sizeof(_sigregs));
        if (err)
                return err;
        regs->psw.mask = PSW_MASK_MERGE(regs->psw.mask,
                                        user_sregs.regs.psw.mask);
        regs->psw.addr = PSW_ADDR_AMODE | user_sregs.regs.psw.addr;
        memcpy(&regs->gprs, &user_sregs.regs.gprs, sizeof(sregs->regs.gprs));
        memcpy(&current->thread.acrs, &user_sregs.regs.acrs,
               sizeof(sregs->regs.acrs));
        restore_access_regs(current->thread.acrs);
 
        memcpy(&current->thread.fp_regs, &user_sregs.fpregs,
               sizeof(s390_fp_regs));
        current->thread.fp_regs.fpc &= FPC_VALID_MASK;
 
        restore_fp_regs(&current->thread.fp_regs);
        regs->trap = -1;        /* disable syscall checks */
        return 0;
}
 
asmlinkage long sys_sigreturn(void)
{
        struct pt_regs *regs = task_pt_regs(current);
        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(void)
{
        struct pt_regs *regs = task_pt_regs(current);
        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;
 
        if (do_sigaltstack(&frame->uc.uc_stack, NULL,
                           regs->gprs[15]) == -EFAULT)
                goto badframe;
        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 int 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 0;
 
give_sigsegv:
        force_sigsegv(sig, current);
        return -EFAULT;
}
 
static int 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(NULL, &frame->uc.uc_link);
        err |= __put_user((void __user *)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;
                if (__put_user(S390_SYSCALL_OPCODE | __NR_rt_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->info;
        regs->gprs[4] = (unsigned long) &frame->uc;
        return 0;
 
give_sigsegv:
        force_sigsegv(sig, current);
        return -EFAULT;
}
 
/*
 * OK, we're invoking a handler
 */
 
static int
handle_signal(unsigned long sig, struct k_sigaction *ka,
              siginfo_t *info, sigset_t *oldset, struct pt_regs * regs)
{
        int ret;
 
        /* Set up the stack frame */
        if (ka->sa.sa_flags & SA_SIGINFO)
                ret = setup_rt_frame(sig, ka, info, oldset, regs);
        else
                ret = setup_frame(sig, ka, oldset, regs);
 
        if (ret == 0) {
                spin_lock_irq(&current->sighand->siglock);
                sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);
                if (!(ka->sa.sa_flags & SA_NODEFER))
                        sigaddset(&current->blocked,sig);
                recalc_sigpending();
                spin_unlock_irq(&current->sighand->siglock);
        }
 
        return ret;
}
 
/*
 * 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.
 */
void do_signal(struct pt_regs *regs)
{
        unsigned long retval = 0, continue_addr = 0, restart_addr = 0;
        siginfo_t info;
        int signr;
        struct k_sigaction ka;
        sigset_t *oldset;
 
        /*
         * 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;
 
        if (test_thread_flag(TIF_RESTORE_SIGMASK))
                oldset = &current->saved_sigmask;
        else
                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. */
                switch (retval) {
                case -ERESTARTNOHAND:
                case -ERESTARTSYS:
                case -ERESTARTNOINTR:
                        regs->gprs[2] = regs->orig_gpr2;
                        regs->psw.addr = restart_addr;
                        break;
                case -ERESTART_RESTARTBLOCK:
                        regs->gprs[2] = -EINTR;
                }
                regs->trap = -1;        /* Don't deal with this again. */
        }
 
        /* 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_COMPAT
                if (test_thread_flag(TIF_31BIT)) {
                        extern int handle_signal32(unsigned long sig,
                                                   struct k_sigaction *ka,
                                                   siginfo_t *info,
                                                   sigset_t *oldset,
                                                   struct pt_regs *regs);
                        if (handle_signal32(
                                    signr, &ka, &info, oldset, regs) == 0) {
                                if (test_thread_flag(TIF_RESTORE_SIGMASK))
                                        clear_thread_flag(TIF_RESTORE_SIGMASK);
                        }
                        return;
                }
#endif
                if (handle_signal(signr, &ka, &info, oldset, regs) == 0) {
                        /*
                         * A signal was successfully delivered; the saved
                         * sigmask will have been stored in the signal frame,
                         * and will be restored by sigreturn, so we can simply
                         * clear the TIF_RESTORE_SIGMASK flag.
                         */
                        if (test_thread_flag(TIF_RESTORE_SIGMASK))
                                clear_thread_flag(TIF_RESTORE_SIGMASK);
                }
                return;
        }
 
        /*
         * If there's no signal to deliver, we just put the saved sigmask back.
         */
        if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
                clear_thread_flag(TIF_RESTORE_SIGMASK);
                sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
        }
 
        /* 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);
        }
}

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[/] [test_project/] [trunk/] [linux_sd_driver/] [arch/] [s390/] [kernel/] [signal.c] - Blame information for rev 63

Line No.	Rev	Author	Line
1	63	marcus.erl	`/*`
2			`* arch/s390/kernel/signal.c`
3			`*`
4			`* Copyright (C) IBM Corp. 1999,2006`
5			`* Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)`
6			`*`
7			`* Based on Intel version`
8			`*`
9			`* Copyright (C) 1991, 1992 Linus Torvalds`
10			`*`
11			`* 1997-11-28 Modified for POSIX.1b signals by Richard Henderson`
12			`*/`
13
14			`#include <linux/sched.h>`
15			`#include <linux/mm.h>`
16			`#include <linux/smp.h>`
17			`#include <linux/kernel.h>`
18			`#include <linux/signal.h>`
19			`#include <linux/errno.h>`
20			`#include <linux/wait.h>`
21			`#include <linux/ptrace.h>`
22			`#include <linux/unistd.h>`
23			`#include <linux/stddef.h>`
24			`#include <linux/tty.h>`
25			`#include <linux/personality.h>`
26			`#include <linux/binfmts.h>`
27			`#include <asm/ucontext.h>`
28			`#include <asm/uaccess.h>`
29			`#include <asm/lowcore.h>`
30
31			`#define _BLOCKABLE (~(sigmask(SIGKILL) \| sigmask(SIGSTOP)))`
32
33
34			`typedef struct`
35			`{`
36			`__u8 callee_used_stack[__SIGNAL_FRAMESIZE];`
37			`struct sigcontext sc;`
38			`_sigregs sregs;`
39			`int signo;`
40			`__u8 retcode[S390_SYSCALL_SIZE];`
41			`} sigframe;`
42
43			`typedef struct`
44			`{`
45			`__u8 callee_used_stack[__SIGNAL_FRAMESIZE];`
46			`__u8 retcode[S390_SYSCALL_SIZE];`
47			`struct siginfo info;`
48			`struct ucontext uc;`
49			`} rt_sigframe;`
50
51			`/*`
52			`* Atomically swap in the new signal mask, and wait for a signal.`
53			`*/`
54			`asmlinkage int`
55			`sys_sigsuspend(int history0, int history1, old_sigset_t mask)`
56			`{`
57			`mask &= _BLOCKABLE;`
58			`spin_lock_irq(&current->sighand->siglock);`
59			`current->saved_sigmask = current->blocked;`
60			`siginitset(&current->blocked, mask);`
61			`recalc_sigpending();`
62			`spin_unlock_irq(&current->sighand->siglock);`
63
64			`current->state = TASK_INTERRUPTIBLE;`
65			`schedule();`
66			`set_thread_flag(TIF_RESTORE_SIGMASK);`
67
68			`return -ERESTARTNOHAND;`
69			`}`
70
71			`asmlinkage long`
72			`sys_sigaction(int sig, const struct old_sigaction __user *act,`
73			`struct old_sigaction __user *oact)`
74			`{`
75			`struct k_sigaction new_ka, old_ka;`
76			`int ret;`
77
78			`if (act) {`
79			`old_sigset_t mask;`
80			`if (!access_ok(VERIFY_READ, act, sizeof(*act)) \|\|`
81			`__get_user(new_ka.sa.sa_handler, &act->sa_handler) \|\|`
82			`__get_user(new_ka.sa.sa_restorer, &act->sa_restorer) \|\|`
83			`__get_user(new_ka.sa.sa_flags, &act->sa_flags) \|\|`
84			`__get_user(mask, &act->sa_mask))`
85			`return -EFAULT;`
86			`siginitset(&new_ka.sa.sa_mask, mask);`
87			`}`
88
89			`ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);`
90
91			`if (!ret && oact) {`
92			`if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) \|\|`
93			`__put_user(old_ka.sa.sa_handler, &oact->sa_handler) \|\|`
94			`__put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) \|\|`
95			`__put_user(old_ka.sa.sa_flags, &oact->sa_flags) \|\|`
96			`__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))`
97			`return -EFAULT;`
98			`}`
99
100			`return ret;`
101			`}`
102
103			`asmlinkage long`
104			`sys_sigaltstack(const stack_t __user uss, stack_t __user uoss)`
105			`{`
106			`struct pt_regs *regs = task_pt_regs(current);`
107			`return do_sigaltstack(uss, uoss, regs->gprs[15]);`
108			`}`
109
110
111
112			`/* Returns non-zero on fault. */`
113			`static int save_sigregs(struct pt_regs regs, _sigregs __user sregs)`
114			`{`
115			`_sigregs user_sregs;`
116
117			`save_access_regs(current->thread.acrs);`
118
119			`/* Copy a 'clean' PSW mask to the user to avoid leaking`
120			`information about whether PER is currently on. */`
121			`user_sregs.regs.psw.mask = PSW_MASK_MERGE(psw_user_bits, regs->psw.mask);`
122			`user_sregs.regs.psw.addr = regs->psw.addr;`
123			`memcpy(&user_sregs.regs.gprs, &regs->gprs, sizeof(sregs->regs.gprs));`
124			`memcpy(&user_sregs.regs.acrs, current->thread.acrs,`
125			`sizeof(sregs->regs.acrs));`
126			`/*`
127			`* We have to store the fp registers to current->thread.fp_regs`
128			`* to merge them with the emulated registers.`
129			`*/`
130			`save_fp_regs(&current->thread.fp_regs);`
131			`memcpy(&user_sregs.fpregs, &current->thread.fp_regs,`
132			`sizeof(s390_fp_regs));`
133			`return __copy_to_user(sregs, &user_sregs, sizeof(_sigregs));`
134			`}`
135
136			`/* Returns positive number on error */`
137			`static int restore_sigregs(struct pt_regs regs, _sigregs __user sregs)`
138			`{`
139			`int err;`
140			`_sigregs user_sregs;`
141
142			`/* Alwys make any pending restarted system call return -EINTR */`
143			`current_thread_info()->restart_block.fn = do_no_restart_syscall;`
144
145			`err = __copy_from_user(&user_sregs, sregs, sizeof(_sigregs));`
146			`if (err)`
147			`return err;`
148			`regs->psw.mask = PSW_MASK_MERGE(regs->psw.mask,`
149			`user_sregs.regs.psw.mask);`
150			`regs->psw.addr = PSW_ADDR_AMODE \| user_sregs.regs.psw.addr;`
151			`memcpy(&regs->gprs, &user_sregs.regs.gprs, sizeof(sregs->regs.gprs));`
152			`memcpy(&current->thread.acrs, &user_sregs.regs.acrs,`
153			`sizeof(sregs->regs.acrs));`
154			`restore_access_regs(current->thread.acrs);`
155
156			`memcpy(&current->thread.fp_regs, &user_sregs.fpregs,`
157			`sizeof(s390_fp_regs));`
158			`current->thread.fp_regs.fpc &= FPC_VALID_MASK;`
159
160			`restore_fp_regs(&current->thread.fp_regs);`
161			`regs->trap = -1; /* disable syscall checks */`
162			`return 0;`
163			`}`
164
165			`asmlinkage long sys_sigreturn(void)`
166			`{`
167			`struct pt_regs *regs = task_pt_regs(current);`
168			`sigframe __user frame = (sigframe __user )regs->gprs[15];`
169			`sigset_t set;`
170
171			`if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))`
172			`goto badframe;`
173			`if (__copy_from_user(&set.sig, &frame->sc.oldmask, _SIGMASK_COPY_SIZE))`
174			`goto badframe;`
175
176			`sigdelsetmask(&set, ~_BLOCKABLE);`
177			`spin_lock_irq(&current->sighand->siglock);`
178			`current->blocked = set;`
179			`recalc_sigpending();`
180			`spin_unlock_irq(&current->sighand->siglock);`
181
182			`if (restore_sigregs(regs, &frame->sregs))`
183			`goto badframe;`
184
185			`return regs->gprs[2];`
186
187			`badframe:`
188			`force_sig(SIGSEGV, current);`
189			`return 0;`
190			`}`
191
192			`asmlinkage long sys_rt_sigreturn(void)`
193			`{`
194			`struct pt_regs *regs = task_pt_regs(current);`
195			`rt_sigframe __user frame = (rt_sigframe __user )regs->gprs[15];`
196			`sigset_t set;`
197
198			`if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))`
199			`goto badframe;`
200			`if (__copy_from_user(&set.sig, &frame->uc.uc_sigmask, sizeof(set)))`
201			`goto badframe;`
202
203			`sigdelsetmask(&set, ~_BLOCKABLE);`
204			`spin_lock_irq(&current->sighand->siglock);`
205			`current->blocked = set;`
206			`recalc_sigpending();`
207			`spin_unlock_irq(&current->sighand->siglock);`
208
209			`if (restore_sigregs(regs, &frame->uc.uc_mcontext))`
210			`goto badframe;`
211
212			`if (do_sigaltstack(&frame->uc.uc_stack, NULL,`
213			`regs->gprs[15]) == -EFAULT)`
214			`goto badframe;`
215			`return regs->gprs[2];`
216
217			`badframe:`
218			`force_sig(SIGSEGV, current);`
219			`return 0;`
220			`}`
221
222			`/*`
223			`* Set up a signal frame.`
224			`*/`
225
226
227			`/*`
228			`* Determine which stack to use..`
229			`*/`
230			`static inline void __user *`
231			`get_sigframe(struct k_sigaction ka, struct pt_regs regs, size_t frame_size)`
232			`{`
233			`unsigned long sp;`
234
235			`/* Default to using normal stack */`
236			`sp = regs->gprs[15];`
237
238			`/* This is the X/Open sanctioned signal stack switching. */`
239			`if (ka->sa.sa_flags & SA_ONSTACK) {`
240			`if (! sas_ss_flags(sp))`
241			`sp = current->sas_ss_sp + current->sas_ss_size;`
242			`}`
243
244			`/* This is the legacy signal stack switching. */`
245			`else if (!user_mode(regs) &&`
246			`!(ka->sa.sa_flags & SA_RESTORER) &&`
247			`ka->sa.sa_restorer) {`
248			`sp = (unsigned long) ka->sa.sa_restorer;`
249			`}`
250
251			`return (void __user *)((sp - frame_size) & -8ul);`
252			`}`
253
254			`static inline int map_signal(int sig)`
255			`{`
256			`if (current_thread_info()->exec_domain`
257			`&& current_thread_info()->exec_domain->signal_invmap`
258			`&& sig < 32)`
259			`return current_thread_info()->exec_domain->signal_invmap[sig];`
260			`else`
261			`return sig;`
262			`}`
263
264			`static int setup_frame(int sig, struct k_sigaction *ka,`
265			`sigset_t set, struct pt_regs regs)`
266			`{`
267			`sigframe __user *frame;`
268
269			`frame = get_sigframe(ka, regs, sizeof(sigframe));`
270			`if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe)))`
271			`goto give_sigsegv;`
272
273			`if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE))`
274			`goto give_sigsegv;`
275
276			`if (save_sigregs(regs, &frame->sregs))`
277			`goto give_sigsegv;`
278			`if (__put_user(&frame->sregs, &frame->sc.sregs))`
279			`goto give_sigsegv;`
280
281			`/* Set up to return from userspace. If provided, use a stub`
282			`already in userspace. */`
283			`if (ka->sa.sa_flags & SA_RESTORER) {`
284			`regs->gprs[14] = (unsigned long)`
285			`ka->sa.sa_restorer \| PSW_ADDR_AMODE;`
286			`} else {`
287			`regs->gprs[14] = (unsigned long)`
288			`frame->retcode \| PSW_ADDR_AMODE;`
289			`if (__put_user(S390_SYSCALL_OPCODE \| __NR_sigreturn,`
290			`(u16 __user *)(frame->retcode)))`
291			`goto give_sigsegv;`
292			`}`
293
294			`/* Set up backchain. */`
295			`if (__put_user(regs->gprs[15], (addr_t __user *) frame))`
296			`goto give_sigsegv;`
297
298			`/* Set up registers for signal handler */`
299			`regs->gprs[15] = (unsigned long) frame;`
300			`regs->psw.addr = (unsigned long) ka->sa.sa_handler \| PSW_ADDR_AMODE;`
301
302			`regs->gprs[2] = map_signal(sig);`
303			`regs->gprs[3] = (unsigned long) &frame->sc;`
304
305			`/* We forgot to include these in the sigcontext.`
306			`To avoid breaking binary compatibility, they are passed as args. */`
307			`regs->gprs[4] = current->thread.trap_no;`
308			`regs->gprs[5] = current->thread.prot_addr;`
309
310			`/* Place signal number on stack to allow backtrace from handler. */`
311			`if (__put_user(regs->gprs[2], (int __user *) &frame->signo))`
312			`goto give_sigsegv;`
313			`return 0;`
314
315			`give_sigsegv:`
316			`force_sigsegv(sig, current);`
317			`return -EFAULT;`
318			`}`
319
320			`static int setup_rt_frame(int sig, struct k_sigaction ka, siginfo_t info,`
321			`sigset_t set, struct pt_regs regs)`
322			`{`
323			`int err = 0;`
324			`rt_sigframe __user *frame;`
325
326			`frame = get_sigframe(ka, regs, sizeof(rt_sigframe));`
327			`if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe)))`
328			`goto give_sigsegv;`
329
330			`if (copy_siginfo_to_user(&frame->info, info))`
331			`goto give_sigsegv;`
332
333			`/* Create the ucontext. */`
334			`err \|= __put_user(0, &frame->uc.uc_flags);`
335			`err \|= __put_user(NULL, &frame->uc.uc_link);`
336			`err \|= __put_user((void __user *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);`
337			`err \|= __put_user(sas_ss_flags(regs->gprs[15]),`
338			`&frame->uc.uc_stack.ss_flags);`
339			`err \|= __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size);`
340			`err \|= save_sigregs(regs, &frame->uc.uc_mcontext);`
341			`err \|= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));`
342			`if (err)`
343			`goto give_sigsegv;`
344
345			`/* Set up to return from userspace. If provided, use a stub`
346			`already in userspace. */`
347			`if (ka->sa.sa_flags & SA_RESTORER) {`
348			`regs->gprs[14] = (unsigned long)`
349			`ka->sa.sa_restorer \| PSW_ADDR_AMODE;`
350			`} else {`
351			`regs->gprs[14] = (unsigned long)`
352			`frame->retcode \| PSW_ADDR_AMODE;`
353			`if (__put_user(S390_SYSCALL_OPCODE \| __NR_rt_sigreturn,`
354			`(u16 __user *)(frame->retcode)))`
355			`goto give_sigsegv;`
356			`}`
357
358			`/* Set up backchain. */`
359			`if (__put_user(regs->gprs[15], (addr_t __user *) frame))`
360			`goto give_sigsegv;`
361
362			`/* Set up registers for signal handler */`
363			`regs->gprs[15] = (unsigned long) frame;`
364			`regs->psw.addr = (unsigned long) ka->sa.sa_handler \| PSW_ADDR_AMODE;`
365
366			`regs->gprs[2] = map_signal(sig);`
367			`regs->gprs[3] = (unsigned long) &frame->info;`
368			`regs->gprs[4] = (unsigned long) &frame->uc;`
369			`return 0;`
370
371			`give_sigsegv:`
372			`force_sigsegv(sig, current);`
373			`return -EFAULT;`
374			`}`
375
376			`/*`
377			`* OK, we're invoking a handler`
378			`*/`
379
380			`static int`
381			`handle_signal(unsigned long sig, struct k_sigaction *ka,`
382			`siginfo_t info, sigset_t oldset, struct pt_regs * regs)`
383			`{`
384			`int ret;`
385
386			`/* Set up the stack frame */`
387			`if (ka->sa.sa_flags & SA_SIGINFO)`
388			`ret = setup_rt_frame(sig, ka, info, oldset, regs);`
389			`else`
390			`ret = setup_frame(sig, ka, oldset, regs);`
391
392			`if (ret == 0) {`
393			`spin_lock_irq(&current->sighand->siglock);`
394			`sigorsets(&current->blocked,&current->blocked,&ka->sa.sa_mask);`
395			`if (!(ka->sa.sa_flags & SA_NODEFER))`
396			`sigaddset(&current->blocked,sig);`
397			`recalc_sigpending();`
398			`spin_unlock_irq(&current->sighand->siglock);`
399			`}`
400
401			`return ret;`
402			`}`
403
404			`/*`
405			`* Note that 'init' is a special process: it doesn't get signals it doesn't`
406			`* want to handle. Thus you cannot kill init even with a SIGKILL even by`
407			`* mistake.`
408			`*`
409			`* Note that we go through the signals twice: once to check the signals that`
410			`* the kernel can handle, and then we build all the user-level signal handling`
411			`* stack-frames in one go after that.`
412			`*/`
413			`void do_signal(struct pt_regs *regs)`
414			`{`
415			`unsigned long retval = 0, continue_addr = 0, restart_addr = 0;`
416			`siginfo_t info;`
417			`int signr;`
418			`struct k_sigaction ka;`
419			`sigset_t *oldset;`
420
421			`/*`
422			`* We want the common case to go fast, which`
423			`* is why we may in certain cases get here from`
424			`* kernel mode. Just return without doing anything`
425			`* if so.`
426			`*/`
427			`if (!user_mode(regs))`
428			`return;`
429
430			`if (test_thread_flag(TIF_RESTORE_SIGMASK))`
431			`oldset = &current->saved_sigmask;`
432			`else`
433			`oldset = &current->blocked;`
434
435			`/* Are we from a system call? */`
436			`if (regs->trap == __LC_SVC_OLD_PSW) {`
437			`continue_addr = regs->psw.addr;`
438			`restart_addr = continue_addr - regs->ilc;`
439			`retval = regs->gprs[2];`
440
441			`/* Prepare for system call restart. We do this here so that a`
442			`debugger will see the already changed PSW. */`
443			`switch (retval) {`
444			`case -ERESTARTNOHAND:`
445			`case -ERESTARTSYS:`
446			`case -ERESTARTNOINTR:`
447			`regs->gprs[2] = regs->orig_gpr2;`
448			`regs->psw.addr = restart_addr;`
449			`break;`
450			`case -ERESTART_RESTARTBLOCK:`
451			`regs->gprs[2] = -EINTR;`
452			`}`
453			`regs->trap = -1; /* Don't deal with this again. */`
454			`}`
455
456			`/* Get signal to deliver. When running under ptrace, at this point`
457			`the debugger may change all our registers ... */`
458			`signr = get_signal_to_deliver(&info, &ka, regs, NULL);`
459
460			`/* Depending on the signal settings we may need to revert the`
461			`decision to restart the system call. */`
462			`if (signr > 0 && regs->psw.addr == restart_addr) {`
463			`if (retval == -ERESTARTNOHAND`
464			`\|\| (retval == -ERESTARTSYS`
465			`&& !(current->sighand->action[signr-1].sa.sa_flags`
466			`& SA_RESTART))) {`
467			`regs->gprs[2] = -EINTR;`
468			`regs->psw.addr = continue_addr;`
469			`}`
470			`}`
471
472			`if (signr > 0) {`
473			`/* Whee! Actually deliver the signal. */`
474			`#ifdef CONFIG_COMPAT`
475			`if (test_thread_flag(TIF_31BIT)) {`
476			`extern int handle_signal32(unsigned long sig,`
477			`struct k_sigaction *ka,`
478			`siginfo_t *info,`
479			`sigset_t *oldset,`
480			`struct pt_regs *regs);`
481			`if (handle_signal32(`
482			`signr, &ka, &info, oldset, regs) == 0) {`
483			`if (test_thread_flag(TIF_RESTORE_SIGMASK))`
484			`clear_thread_flag(TIF_RESTORE_SIGMASK);`
485			`}`
486			`return;`
487			`}`
488			`#endif`
489			`if (handle_signal(signr, &ka, &info, oldset, regs) == 0) {`
490			`/*`
491			`* A signal was successfully delivered; the saved`
492			`* sigmask will have been stored in the signal frame,`
493			`* and will be restored by sigreturn, so we can simply`
494			`* clear the TIF_RESTORE_SIGMASK flag.`
495			`*/`
496			`if (test_thread_flag(TIF_RESTORE_SIGMASK))`
497			`clear_thread_flag(TIF_RESTORE_SIGMASK);`
498			`}`
499			`return;`
500			`}`
501
502			`/*`
503			`* If there's no signal to deliver, we just put the saved sigmask back.`
504			`*/`
505			`if (test_thread_flag(TIF_RESTORE_SIGMASK)) {`
506			`clear_thread_flag(TIF_RESTORE_SIGMASK);`
507			`sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);`
508			`}`
509
510			`/* Restart a different system call. */`
511			`if (retval == -ERESTART_RESTARTBLOCK`
512			`&& regs->psw.addr == continue_addr) {`
513			`regs->gprs[2] = __NR_restart_syscall;`
514			`set_thread_flag(TIF_RESTART_SVC);`
515			`}`
516			`}`