diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-23 12:05:44 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-05-23 12:05:44 -0700 |
commit | 3813d4024a75562baf77d3907fb6afbf8f9c8232 (patch) | |
tree | 6675ef449bd0ed7adbe1b785eaed25db55bc29f3 /arch/ia64/kernel | |
parent | 2335a8366f63a5191b5a2b3c5a05d90fe814654c (diff) | |
parent | 4035c6db5a9dedf5e79c502bf39389a0b714cb38 (diff) |
Merge tag 'ia64-3.5-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux
Pull Itanium fixes from Tony Luck.
* tag 'ia64-3.5-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux:
[IA64] Liberate the signal layer from IA64 assembler
[IA64] Add cmpxchg.h to exported userspace headers
[IA64] Fix fast syscall version of getcpu()
[IA64] Removed "task_size" element from thread_struct - it is now constant
Diffstat (limited to 'arch/ia64/kernel')
-rw-r--r-- | arch/ia64/kernel/fsys.S | 191 |
1 files changed, 13 insertions, 178 deletions
diff --git a/arch/ia64/kernel/fsys.S b/arch/ia64/kernel/fsys.S index cc26edac0ec6..e662f178b990 100644 --- a/arch/ia64/kernel/fsys.S +++ b/arch/ia64/kernel/fsys.S @@ -372,175 +372,6 @@ ENTRY(fsys_clock_gettime) END(fsys_clock_gettime) /* - * long fsys_rt_sigprocmask (int how, sigset_t *set, sigset_t *oset, size_t sigsetsize). - */ -#if _NSIG_WORDS != 1 -# error Sorry, fsys_rt_sigprocmask() needs to be updated for _NSIG_WORDS != 1. -#endif -ENTRY(fsys_rt_sigprocmask) - .prologue - .altrp b6 - .body - - add r2=IA64_TASK_BLOCKED_OFFSET,r16 - add r9=TI_FLAGS+IA64_TASK_SIZE,r16 - cmp4.ltu p6,p0=SIG_SETMASK,r32 - - cmp.ne p15,p0=r0,r34 // oset != NULL? - tnat.nz p8,p0=r34 - add r31=IA64_TASK_SIGHAND_OFFSET,r16 - ;; - ld8 r3=[r2] // read/prefetch current->blocked - ld4 r9=[r9] - tnat.nz.or p6,p0=r35 - - cmp.ne.or p6,p0=_NSIG_WORDS*8,r35 - tnat.nz.or p6,p0=r32 -(p6) br.spnt.few .fail_einval // fail with EINVAL - ;; -#ifdef CONFIG_SMP - ld8 r31=[r31] // r31 <- current->sighand -#endif - and r9=TIF_ALLWORK_MASK,r9 - tnat.nz.or p8,p0=r33 - ;; - cmp.ne p7,p0=0,r9 - cmp.eq p6,p0=r0,r33 // set == NULL? - add r31=IA64_SIGHAND_SIGLOCK_OFFSET,r31 // r31 <- current->sighand->siglock -(p8) br.spnt.few .fail_efault // fail with EFAULT -(p7) br.spnt.many fsys_fallback_syscall // got pending kernel work... -(p6) br.dpnt.many .store_mask // -> short-circuit to just reading the signal mask - - /* Argh, we actually have to do some work and _update_ the signal mask: */ - -EX(.fail_efault, probe.r.fault r33, 3) // verify user has read-access to *set -EX(.fail_efault, ld8 r14=[r33]) // r14 <- *set - mov r17=(1 << (SIGKILL - 1)) | (1 << (SIGSTOP - 1)) - ;; - - RSM_PSR_I(p0, r18, r19) // mask interrupt delivery - andcm r14=r14,r17 // filter out SIGKILL & SIGSTOP - mov r8=EINVAL // default to EINVAL - -#ifdef CONFIG_SMP - // __ticket_spin_trylock(r31) - ld4 r17=[r31] - ;; - mov.m ar.ccv=r17 - extr.u r9=r17,17,15 - adds r19=1,r17 - extr.u r18=r17,0,15 - ;; - cmp.eq p6,p7=r9,r18 - ;; -(p6) cmpxchg4.acq r9=[r31],r19,ar.ccv -(p6) dep.z r20=r19,1,15 // next serving ticket for unlock -(p7) br.cond.spnt.many .lock_contention - ;; - cmp4.eq p0,p7=r9,r17 - adds r31=2,r31 -(p7) br.cond.spnt.many .lock_contention - ld8 r3=[r2] // re-read current->blocked now that we hold the lock - ;; -#else - ld8 r3=[r2] // re-read current->blocked now that we hold the lock -#endif - add r18=IA64_TASK_PENDING_OFFSET+IA64_SIGPENDING_SIGNAL_OFFSET,r16 - add r19=IA64_TASK_SIGNAL_OFFSET,r16 - cmp4.eq p6,p0=SIG_BLOCK,r32 - ;; - ld8 r19=[r19] // r19 <- current->signal - cmp4.eq p7,p0=SIG_UNBLOCK,r32 - cmp4.eq p8,p0=SIG_SETMASK,r32 - ;; - ld8 r18=[r18] // r18 <- current->pending.signal - .pred.rel.mutex p6,p7,p8 -(p6) or r14=r3,r14 // SIG_BLOCK -(p7) andcm r14=r3,r14 // SIG_UNBLOCK - -(p8) mov r14=r14 // SIG_SETMASK -(p6) mov r8=0 // clear error code - // recalc_sigpending() - add r17=IA64_SIGNAL_GROUP_STOP_COUNT_OFFSET,r19 - - add r19=IA64_SIGNAL_SHARED_PENDING_OFFSET+IA64_SIGPENDING_SIGNAL_OFFSET,r19 - ;; - ld4 r17=[r17] // r17 <- current->signal->group_stop_count -(p7) mov r8=0 // clear error code - - ld8 r19=[r19] // r19 <- current->signal->shared_pending - ;; - cmp4.gt p6,p7=r17,r0 // p6/p7 <- (current->signal->group_stop_count > 0)? -(p8) mov r8=0 // clear error code - - or r18=r18,r19 // r18 <- current->pending | current->signal->shared_pending - ;; - // r18 <- (current->pending | current->signal->shared_pending) & ~current->blocked: - andcm r18=r18,r14 - add r9=TI_FLAGS+IA64_TASK_SIZE,r16 - ;; - -(p7) cmp.ne.or.andcm p6,p7=r18,r0 // p6/p7 <- signal pending - mov r19=0 // i must not leak kernel bits... -(p6) br.cond.dpnt.many .sig_pending - ;; - -1: ld4 r17=[r9] // r17 <- current->thread_info->flags - ;; - mov ar.ccv=r17 - and r18=~_TIF_SIGPENDING,r17 // r18 <- r17 & ~(1 << TIF_SIGPENDING) - ;; - - st8 [r2]=r14 // update current->blocked with new mask - cmpxchg4.acq r8=[r9],r18,ar.ccv // current->thread_info->flags <- r18 - ;; - cmp.ne p6,p0=r17,r8 // update failed? -(p6) br.cond.spnt.few 1b // yes -> retry - -#ifdef CONFIG_SMP - // __ticket_spin_unlock(r31) - st2.rel [r31]=r20 - mov r20=0 // i must not leak kernel bits... -#endif - SSM_PSR_I(p0, p9, r31) - ;; - - srlz.d // ensure psr.i is set again - mov r18=0 // i must not leak kernel bits... - -.store_mask: -EX(.fail_efault, (p15) probe.w.fault r34, 3) // verify user has write-access to *oset -EX(.fail_efault, (p15) st8 [r34]=r3) - mov r2=0 // i must not leak kernel bits... - mov r3=0 // i must not leak kernel bits... - mov r8=0 // return 0 - mov r9=0 // i must not leak kernel bits... - mov r14=0 // i must not leak kernel bits... - mov r17=0 // i must not leak kernel bits... - mov r31=0 // i must not leak kernel bits... - FSYS_RETURN - -.sig_pending: -#ifdef CONFIG_SMP - // __ticket_spin_unlock(r31) - st2.rel [r31]=r20 // release the lock -#endif - SSM_PSR_I(p0, p9, r17) - ;; - srlz.d - br.sptk.many fsys_fallback_syscall // with signal pending, do the heavy-weight syscall - -#ifdef CONFIG_SMP -.lock_contention: - /* Rather than spinning here, fall back on doing a heavy-weight syscall. */ - SSM_PSR_I(p0, p9, r17) - ;; - srlz.d - br.sptk.many fsys_fallback_syscall -#endif -END(fsys_rt_sigprocmask) - -/* * fsys_getcpu doesn't use the third parameter in this implementation. It reads * current_thread_info()->cpu and corresponding node in cpu_to_node_map. */ @@ -559,11 +390,15 @@ ENTRY(fsys_getcpu) ;; tnat.nz p7,p0 = r33 // I guard against NaT argument (p7) br.cond.spnt.few .fail_einval // B + ;; + cmp.ne p6,p0=r32,r0 + cmp.ne p7,p0=r33,r0 + ;; #ifdef CONFIG_NUMA movl r17=cpu_to_node_map ;; -EX(.fail_efault, probe.w.fault r32, 3) // M This takes 5 cycles -EX(.fail_efault, probe.w.fault r33, 3) // M This takes 5 cycles +EX(.fail_efault, (p6) probe.w.fault r32, 3) // M This takes 5 cycles +EX(.fail_efault, (p7) probe.w.fault r33, 3) // M This takes 5 cycles shladd r18=r3,1,r17 ;; ld2 r20=[r18] // r20 = cpu_to_node_map[cpu] @@ -573,20 +408,20 @@ EX(.fail_efault, probe.w.fault r33, 3) // M This takes 5 cycles (p8) br.spnt.many fsys_fallback_syscall ;; ;; -EX(.fail_efault, st4 [r32] = r3) -EX(.fail_efault, st2 [r33] = r20) +EX(.fail_efault, (p6) st4 [r32] = r3) +EX(.fail_efault, (p7) st2 [r33] = r20) mov r8=0 ;; #else -EX(.fail_efault, probe.w.fault r32, 3) // M This takes 5 cycles -EX(.fail_efault, probe.w.fault r33, 3) // M This takes 5 cycles +EX(.fail_efault, (p6) probe.w.fault r32, 3) // M This takes 5 cycles +EX(.fail_efault, (p7) probe.w.fault r33, 3) // M This takes 5 cycles and r2 = TIF_ALLWORK_MASK,r2 ;; cmp.ne p8,p0=0,r2 (p8) br.spnt.many fsys_fallback_syscall ;; -EX(.fail_efault, st4 [r32] = r3) -EX(.fail_efault, st2 [r33] = r0) +EX(.fail_efault, (p6) st4 [r32] = r3) +EX(.fail_efault, (p7) st2 [r33] = r0) mov r8=0 ;; #endif @@ -916,7 +751,7 @@ paravirt_fsyscall_table: data8 0 // sigaltstack data8 0 // rt_sigaction data8 0 // rt_sigpending - data8 fsys_rt_sigprocmask // rt_sigprocmask + data8 0 // rt_sigprocmask data8 0 // rt_sigqueueinfo // 1180 data8 0 // rt_sigreturn data8 0 // rt_sigsuspend |