X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=arch%2Fparisc%2Fkernel%2Fsignal.c;h=fb35ebc0c4da241a5d6da6e7e3b00de10a581b81;hb=4ff4275b24fdcca189b33f9a73fe7abef1dc84bc;hp=bb83880c5ee3458bd9940b96e527bf9146cb96e9;hpb=602cada851b28c5792339786efe872fbdc1f5d41;p=linux-2.6-omap-h63xx.git diff --git a/arch/parisc/kernel/signal.c b/arch/parisc/kernel/signal.c index bb83880c5ee..fb35ebc0c4d 100644 --- a/arch/parisc/kernel/signal.c +++ b/arch/parisc/kernel/signal.c @@ -16,7 +16,6 @@ #include #include #include -#include #include #include #include @@ -26,7 +25,6 @@ #include #include #include -#include #include #include #include @@ -60,58 +58,13 @@ * this. */ #define A(__x) ((unsigned long)(__x)) -int do_signal(sigset_t *oldset, struct pt_regs *regs, int in_syscall); - /* * Atomically swap in the new signal mask, and wait for a signal. */ -#ifdef __LP64__ +#ifdef CONFIG_64BIT #include "sys32.h" #endif -asmlinkage int -sys_rt_sigsuspend(sigset_t __user *unewset, size_t sigsetsize, struct pt_regs *regs) -{ - sigset_t saveset, newset; -#ifdef __LP64__ - compat_sigset_t newset32; - - if (is_compat_task()) { - /* XXX: Don't preclude handling different sized sigset_t's. */ - if (sigsetsize != sizeof(compat_sigset_t)) - return -EINVAL; - if (copy_from_user(&newset32, (compat_sigset_t __user *)unewset, sizeof(newset32))) - return -EFAULT; - sigset_32to64(&newset,&newset32); - - } else -#endif - { - /* 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(¤t->sighand->siglock); - saveset = current->blocked; - current->blocked = newset; - recalc_sigpending(); - spin_unlock_irq(¤t->sighand->siglock); - - regs->gr[28] = -EINTR; - while (1) { - current->state = TASK_INTERRUPTIBLE; - schedule(); - if (do_signal(&saveset, regs, 1)) - return -EINTR; - } -} - /* * Do a signal return - restore sigcontext. */ @@ -149,7 +102,7 @@ sys_rt_sigreturn(struct pt_regs *regs, int in_syscall) sigset_t set; unsigned long usp = (regs->gr[30] & ~(0x01UL)); unsigned long sigframe_size = PARISC_RT_SIGFRAME_SIZE; -#ifdef __LP64__ +#ifdef CONFIG_64BIT compat_sigset_t compat_set; struct compat_rt_sigframe __user * compat_frame; @@ -163,7 +116,7 @@ sys_rt_sigreturn(struct pt_regs *regs, int in_syscall) (usp - sigframe_size); DBG(2,"sys_rt_sigreturn: frame is %p\n", frame); -#ifdef __LP64__ +#ifdef CONFIG_64BIT compat_frame = (struct compat_rt_sigframe __user *)frame; if (is_compat_task()) { @@ -185,7 +138,7 @@ sys_rt_sigreturn(struct pt_regs *regs, int in_syscall) spin_unlock_irq(¤t->sighand->siglock); /* Good thing we saved the old gr[30], eh? */ -#ifdef __LP64__ +#ifdef CONFIG_64BIT if (is_compat_task()) { DBG(1,"sys_rt_sigreturn: compat_frame->uc.uc_mcontext 0x%p\n", &compat_frame->uc.uc_mcontext); @@ -297,7 +250,7 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, unsigned long rp, usp; unsigned long haddr, sigframe_size; int err = 0; -#ifdef __LP64__ +#ifdef CONFIG_64BIT compat_int_t compat_val; struct compat_rt_sigframe __user * compat_frame; compat_sigset_t compat_set; @@ -311,7 +264,7 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, DBG(1,"setup_rt_frame: frame %p info %p\n", frame, info); -#ifdef __LP64__ +#ifdef CONFIG_64BIT compat_frame = (struct compat_rt_sigframe __user *)frame; @@ -391,7 +344,7 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, haddr = A(ka->sa.sa_handler); /* The sa_handler may be a pointer to a function descriptor */ -#ifdef __LP64__ +#ifdef CONFIG_64BIT if (is_compat_task()) { #endif if (haddr & PA_PLABEL_FDESC) { @@ -406,7 +359,7 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, haddr = fdesc.addr; regs->gr[19] = fdesc.gp; } -#ifdef __LP64__ +#ifdef CONFIG_64BIT } else { Elf64_Fdesc fdesc; Elf64_Fdesc __user *ufdesc = (Elf64_Fdesc __user *)A(haddr & ~3); @@ -426,20 +379,20 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, /* The syscall return path will create IAOQ values from r31. */ sigframe_size = PARISC_RT_SIGFRAME_SIZE; -#ifdef __LP64__ +#ifdef CONFIG_64BIT if (is_compat_task()) sigframe_size = PARISC_RT_SIGFRAME_SIZE32; #endif if (in_syscall) { regs->gr[31] = haddr; -#ifdef __LP64__ - if (personality(current->personality) == PER_LINUX) +#ifdef CONFIG_64BIT + if (!test_thread_flag(TIF_32BIT)) sigframe_size |= 1; #endif } else { unsigned long psw = USER_PSW; -#ifdef __LP64__ - if (personality(current->personality) == PER_LINUX) +#ifdef CONFIG_64BIT + if (!test_thread_flag(TIF_32BIT)) psw |= PSW_W; #endif @@ -463,7 +416,7 @@ setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, regs->gr[2] = rp; /* userland return pointer */ regs->gr[26] = sig; /* signal number */ -#ifdef __LP64__ +#ifdef CONFIG_64BIT if (is_compat_task()) { regs->gr[25] = A(&compat_frame->info); /* siginfo pointer */ regs->gr[24] = A(&compat_frame->uc); /* ucontext pointer */ @@ -517,6 +470,97 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, return 1; } +static inline void +syscall_restart(struct pt_regs *regs, struct k_sigaction *ka) +{ + /* Check the return code */ + switch (regs->gr[28]) { + case -ERESTART_RESTARTBLOCK: + current_thread_info()->restart_block.fn = + do_no_restart_syscall; + case -ERESTARTNOHAND: + DBG(1,"ERESTARTNOHAND: returning -EINTR\n"); + regs->gr[28] = -EINTR; + break; + + case -ERESTARTSYS: + if (!(ka->sa.sa_flags & SA_RESTART)) { + DBG(1,"ERESTARTSYS: putting -EINTR\n"); + regs->gr[28] = -EINTR; + break; + } + /* fallthrough */ + case -ERESTARTNOINTR: + /* A syscall is just a branch, so all + * we have to do is fiddle the return pointer. + */ + regs->gr[31] -= 8; /* delayed branching */ + /* Preserve original r28. */ + regs->gr[28] = regs->orig_r28; + break; + } +} + +static inline void +insert_restart_trampoline(struct pt_regs *regs) +{ + switch(regs->gr[28]) { + case -ERESTART_RESTARTBLOCK: { + /* Restart the system call - no handlers present */ + unsigned int *usp = (unsigned int *)regs->gr[30]; + + /* Setup a trampoline to restart the syscall + * with __NR_restart_syscall + * + * 0: + * 4: <2nd half for 64-bit> + * 8: ldw 0(%sp), %r31 + * 12: be 0x100(%sr2, %r0) + * 16: ldi __NR_restart_syscall, %r20 + */ +#ifdef CONFIG_64BIT + put_user(regs->gr[31] >> 32, &usp[0]); + put_user(regs->gr[31] & 0xffffffff, &usp[1]); + put_user(0x0fc010df, &usp[2]); +#else + put_user(regs->gr[31], &usp[0]); + put_user(0x0fc0109f, &usp[2]); +#endif + put_user(0xe0008200, &usp[3]); + put_user(0x34140000, &usp[4]); + + /* Stack is 64-byte aligned, and we only need + * to flush 1 cache line. + * Flushing one cacheline is cheap. + * "sync" on bigger (> 4 way) boxes is not. + */ + flush_icache_range(regs->gr[30], regs->gr[30] + 4); + + regs->gr[31] = regs->gr[30] + 8; + /* Preserve original r28. */ + regs->gr[28] = regs->orig_r28; + + return; + } + case -ERESTARTNOHAND: + case -ERESTARTSYS: + case -ERESTARTNOINTR: { + /* Hooray for delayed branching. We don't + * have to restore %r20 (the system call + * number) because it gets loaded in the delay + * slot of the branch external instruction. + */ + regs->gr[31] -= 8; + /* Preserve original r28. */ + regs->gr[28] = regs->orig_r28; + + return; + } + default: + break; + } +} + /* * 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 @@ -528,13 +572,13 @@ handle_signal(unsigned long sig, siginfo_t *info, struct k_sigaction *ka, * registers). As noted below, the syscall number gets restored for * us due to the magic of delayed branching. */ - -asmlinkage int -do_signal(sigset_t *oldset, struct pt_regs *regs, int in_syscall) +asmlinkage void +do_signal(struct pt_regs *regs, long in_syscall) { siginfo_t info; struct k_sigaction ka; int signr; + sigset_t *oldset; DBG(1,"\ndo_signal: oldset=0x%p, regs=0x%p, sr7 %#lx, in_syscall=%d\n", oldset, regs, regs->sr[7], in_syscall); @@ -544,7 +588,9 @@ do_signal(sigset_t *oldset, struct pt_regs *regs, int in_syscall) we would be called in that case, but for some reason we are. */ - if (!oldset) + if (test_thread_flag(TIF_RESTORE_SIGMASK)) + oldset = ¤t->saved_sigmask; + else oldset = ¤t->blocked; DBG(1,"do_signal: oldset %08lx / %08lx\n", @@ -561,98 +607,41 @@ do_signal(sigset_t *oldset, struct pt_regs *regs, int in_syscall) break; /* Restart a system call if necessary. */ - if (in_syscall) { - /* Check the return code */ - switch (regs->gr[28]) { - case -ERESTART_RESTARTBLOCK: - current_thread_info()->restart_block.fn = do_no_restart_syscall; - case -ERESTARTNOHAND: - DBG(1,"ERESTARTNOHAND: returning -EINTR\n"); - regs->gr[28] = -EINTR; - break; - - case -ERESTARTSYS: - if (!(ka.sa.sa_flags & SA_RESTART)) { - DBG(1,"ERESTARTSYS: putting -EINTR\n"); - regs->gr[28] = -EINTR; - break; - } - /* fallthrough */ - case -ERESTARTNOINTR: - /* A syscall is just a branch, so all - we have to do is fiddle the return pointer. */ - regs->gr[31] -= 8; /* delayed branching */ - /* Preserve original r28. */ - regs->gr[28] = regs->orig_r28; - break; - } - } + if (in_syscall) + syscall_restart(regs, &ka); + /* Whee! Actually deliver the signal. If the delivery failed, we need to continue to iterate in this loop so we can deliver the SIGSEGV... */ - if (handle_signal(signr, &info, &ka, oldset, regs, in_syscall)) { + if (handle_signal(signr, &info, &ka, oldset, + regs, in_syscall)) { DBG(1,KERN_DEBUG "do_signal: Exit (success), regs->gr[28] = %ld\n", regs->gr[28]); - return 1; + if (test_thread_flag(TIF_RESTORE_SIGMASK)) + clear_thread_flag(TIF_RESTORE_SIGMASK); + return; } } /* end of while(1) looping forever if we can't force a signal */ /* Did we come from a system call? */ - if (in_syscall) { - /* Restart the system call - no handlers present */ - if (regs->gr[28] == -ERESTART_RESTARTBLOCK) { - unsigned int *usp = (unsigned int *)regs->gr[30]; - - /* Setup a trampoline to restart the syscall - * with __NR_restart_syscall - * - * 0: - * 4: <2nd half for 64-bit> - * 8: ldw 0(%sp), %r31 - * 12: be 0x100(%sr2, %r0) - * 16: ldi __NR_restart_syscall, %r20 - */ -#ifndef __LP64__ - put_user(regs->gr[31], &usp[0]); - put_user(0x0fc0109f, &usp[2]); -#else - put_user(regs->gr[31] >> 32, &usp[0]); - put_user(regs->gr[31] & 0xffffffff, &usp[1]); - put_user(0x0fc010df, &usp[2]); -#endif - put_user(0xe0008200, &usp[3]); - put_user(0x34140000, &usp[4]); - - /* Stack is 64-byte aligned, and we only need - * to flush 1 cache line. - * Flushing one cacheline is cheap. - * "sync" on bigger (> 4 way) boxes is not. - */ - asm("fdc %%r0(%%sr3, %0)\n" - "sync\n" - "fic %%r0(%%sr3, %0)\n" - "sync\n" - : : "r"(regs->gr[30])); - - regs->gr[31] = regs->gr[30] + 8; - /* Preserve original r28. */ - regs->gr[28] = regs->orig_r28; - } else if (regs->gr[28] == -ERESTARTNOHAND || - regs->gr[28] == -ERESTARTSYS || - regs->gr[28] == -ERESTARTNOINTR) { - /* Hooray for delayed branching. We don't - have to restore %r20 (the system call - number) because it gets loaded in the delay - slot of the branch external instruction. */ - regs->gr[31] -= 8; - /* Preserve original r28. */ - regs->gr[28] = regs->orig_r28; - } - } + if (in_syscall) + insert_restart_trampoline(regs); DBG(1,"do_signal: Exit (not delivered), regs->gr[28] = %ld\n", regs->gr[28]); - return 0; + if (test_thread_flag(TIF_RESTORE_SIGMASK)) { + clear_thread_flag(TIF_RESTORE_SIGMASK); + sigprocmask(SIG_SETMASK, ¤t->saved_sigmask, NULL); + } + + return; +} + +void do_notify_resume(struct pt_regs *regs, long in_syscall) +{ + if (test_thread_flag(TIF_SIGPENDING) || + test_thread_flag(TIF_RESTORE_SIGMASK)) + do_signal(regs, in_syscall); }