Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756566AbXKUWjR (ORCPT ); Wed, 21 Nov 2007 17:39:17 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755005AbXKUWjE (ORCPT ); Wed, 21 Nov 2007 17:39:04 -0500 Received: from mx1.redhat.com ([66.187.233.31]:33983 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752904AbXKUWjB (ORCPT ); Wed, 21 Nov 2007 17:39:01 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit From: Roland McGrath To: Zachary Amsden X-Fcc: ~/Mail/linus Cc: Andrew Morton , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , linux-kernel@vger.kernel.org Subject: [replacement PATCH 5/6] x86: tls32 moved In-Reply-To: Zachary Amsden's message of Wednesday, 21 November 2007 10:34:39 -0800 <1195670079.6352.252.camel@bodhitayantram.eng.vmware.com> References: <20071121101928.A08CF26F8BE@magilla.localdomain> <20071121102511.08B8A26F8BE@magilla.localdomain> <1195670079.6352.252.camel@bodhitayantram.eng.vmware.com> X-Antipastobozoticataclysm: When George Bush projectile vomits antipasto on the Japanese. Message-Id: <20071121223822.114E326F8BE@magilla.localdomain> Date: Wed, 21 Nov 2007 14:38:22 -0800 (PST) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9822 Lines: 371 This renames arch/x86/ia32/tls32.c to arch/x86/kernel/tls.c, which does nothing now but paves the way to consolidate this code for 32-bit too. Signed-off-by: Roland McGrath --- arch/x86/ia32/Makefile | 2 +- arch/x86/ia32/tls32.c | 158 ------------------------------------------- arch/x86/kernel/Makefile_64 | 2 + arch/x86/kernel/tls.c | 158 +++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 161 insertions(+), 159 deletions(-) diff --git a/arch/x86/ia32/Makefile b/arch/x86/ia32/Makefile index e2edda2..3c8b746 100644 --- a/arch/x86/ia32/Makefile +++ b/arch/x86/ia32/Makefile @@ -2,7 +2,7 @@ # Makefile for the ia32 kernel emulation subsystem. # -obj-$(CONFIG_IA32_EMULATION) := ia32entry.o sys_ia32.o ia32_signal.o tls32.o \ +obj-$(CONFIG_IA32_EMULATION) := ia32entry.o sys_ia32.o ia32_signal.o \ ia32_binfmt.o fpu32.o ptrace32.o syscall32.o syscall32_syscall.o \ mmap32.o diff --git a/arch/x86/ia32/tls32.c b/arch/x86/ia32/tls32.c deleted file mode 100644 index 5291596..0000000 --- a/arch/x86/ia32/tls32.c +++ /dev/null @@ -1,158 +0,0 @@ -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include - -/* - * sys_alloc_thread_area: get a yet unused TLS descriptor index. - */ -static int get_free_idx(void) -{ - struct thread_struct *t = ¤t->thread; - int idx; - - for (idx = 0; idx < GDT_ENTRY_TLS_ENTRIES; idx++) - if (desc_empty((struct n_desc_struct *)(t->tls_array) + idx)) - return idx + GDT_ENTRY_TLS_MIN; - return -ESRCH; -} - -/* - * Set a given TLS descriptor: - * When you want addresses > 32bit use arch_prctl() - */ -int do_set_thread_area(struct thread_struct *t, struct user_desc __user *u_info) -{ - struct user_desc info; - struct n_desc_struct *desc; - int cpu, idx; - - if (copy_from_user(&info, u_info, sizeof(info))) - return -EFAULT; - - idx = info.entry_number; - - /* - * index -1 means the kernel should try to find and - * allocate an empty descriptor: - */ - if (idx == -1) { - idx = get_free_idx(); - if (idx < 0) - return idx; - if (put_user(idx, &u_info->entry_number)) - return -EFAULT; - } - - if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX) - return -EINVAL; - - desc = ((struct n_desc_struct *)t->tls_array) + idx - GDT_ENTRY_TLS_MIN; - - /* - * We must not get preempted while modifying the TLS. - */ - cpu = get_cpu(); - - if (LDT_empty(&info)) { - desc->a = 0; - desc->b = 0; - } else { - desc->a = LDT_entry_a(&info); - desc->b = LDT_entry_b(&info); - } - if (t == ¤t->thread) - load_TLS(t, cpu); - - put_cpu(); - return 0; -} - -asmlinkage long sys32_set_thread_area(struct user_desc __user *u_info) -{ - return do_set_thread_area(¤t->thread, u_info); -} - - -/* - * Get the current Thread-Local Storage area: - */ - -#define GET_LIMIT(desc) ( \ - ((desc)->a & 0x0ffff) | \ - ((desc)->b & 0xf0000) ) - -#define GET_32BIT(desc) (((desc)->b >> 22) & 1) -#define GET_CONTENTS(desc) (((desc)->b >> 10) & 3) -#define GET_WRITABLE(desc) (((desc)->b >> 9) & 1) -#define GET_LIMIT_PAGES(desc) (((desc)->b >> 23) & 1) -#define GET_PRESENT(desc) (((desc)->b >> 15) & 1) -#define GET_USEABLE(desc) (((desc)->b >> 20) & 1) -#define GET_LONGMODE(desc) (((desc)->b >> 21) & 1) - -int do_get_thread_area(struct thread_struct *t, struct user_desc __user *u_info) -{ - struct user_desc info; - struct n_desc_struct *desc; - int idx; - - if (get_user(idx, &u_info->entry_number)) - return -EFAULT; - if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX) - return -EINVAL; - - desc = ((struct n_desc_struct *)t->tls_array) + idx - GDT_ENTRY_TLS_MIN; - - memset(&info, 0, sizeof(struct user_desc)); - info.entry_number = idx; - info.base_addr = get_desc_base(desc); - info.limit = GET_LIMIT(desc); - info.seg_32bit = GET_32BIT(desc); - info.contents = GET_CONTENTS(desc); - info.read_exec_only = !GET_WRITABLE(desc); - info.limit_in_pages = GET_LIMIT_PAGES(desc); - info.seg_not_present = !GET_PRESENT(desc); - info.useable = GET_USEABLE(desc); - info.lm = GET_LONGMODE(desc); - - if (copy_to_user(u_info, &info, sizeof(info))) - return -EFAULT; - return 0; -} - -asmlinkage long sys32_get_thread_area(struct user_desc __user *u_info) -{ - return do_get_thread_area(¤t->thread, u_info); -} - - -int ia32_child_tls(struct task_struct *p, struct pt_regs *childregs) -{ - struct n_desc_struct *desc; - struct user_desc info; - struct user_desc __user *cp; - int idx; - - cp = (void __user *)childregs->rsi; - if (copy_from_user(&info, cp, sizeof(info))) - return -EFAULT; - if (LDT_empty(&info)) - return -EINVAL; - - idx = info.entry_number; - if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX) - return -EINVAL; - - desc = (struct n_desc_struct *)(p->thread.tls_array) + idx - GDT_ENTRY_TLS_MIN; - desc->a = LDT_entry_a(&info); - desc->b = LDT_entry_b(&info); - - return 0; -} diff --git a/arch/x86/kernel/Makefile_64 b/arch/x86/kernel/Makefile_64 index 5a88890..203a9d8 100644 --- a/arch/x86/kernel/Makefile_64 +++ b/arch/x86/kernel/Makefile_64 @@ -13,6 +13,8 @@ obj-y := process_64.o signal_64.o entry_64.o traps_64.o irq_64.o \ pci-dma_64.o pci-nommu_64.o alternative.o hpet.o tsc_64.o bugs_64.o \ i8253.o +obj-$(CONFIG_IA32_EMULATION) += tls.o + obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-y += cpu/ obj-y += acpi/ diff --git a/arch/x86/kernel/tls.c b/arch/x86/kernel/tls.c new file mode 100644 index 0000000..5291596 --- /dev/null +++ b/arch/x86/kernel/tls.c @@ -0,0 +1,158 @@ +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +/* + * sys_alloc_thread_area: get a yet unused TLS descriptor index. + */ +static int get_free_idx(void) +{ + struct thread_struct *t = ¤t->thread; + int idx; + + for (idx = 0; idx < GDT_ENTRY_TLS_ENTRIES; idx++) + if (desc_empty((struct n_desc_struct *)(t->tls_array) + idx)) + return idx + GDT_ENTRY_TLS_MIN; + return -ESRCH; +} + +/* + * Set a given TLS descriptor: + * When you want addresses > 32bit use arch_prctl() + */ +int do_set_thread_area(struct thread_struct *t, struct user_desc __user *u_info) +{ + struct user_desc info; + struct n_desc_struct *desc; + int cpu, idx; + + if (copy_from_user(&info, u_info, sizeof(info))) + return -EFAULT; + + idx = info.entry_number; + + /* + * index -1 means the kernel should try to find and + * allocate an empty descriptor: + */ + if (idx == -1) { + idx = get_free_idx(); + if (idx < 0) + return idx; + if (put_user(idx, &u_info->entry_number)) + return -EFAULT; + } + + if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX) + return -EINVAL; + + desc = ((struct n_desc_struct *)t->tls_array) + idx - GDT_ENTRY_TLS_MIN; + + /* + * We must not get preempted while modifying the TLS. + */ + cpu = get_cpu(); + + if (LDT_empty(&info)) { + desc->a = 0; + desc->b = 0; + } else { + desc->a = LDT_entry_a(&info); + desc->b = LDT_entry_b(&info); + } + if (t == ¤t->thread) + load_TLS(t, cpu); + + put_cpu(); + return 0; +} + +asmlinkage long sys32_set_thread_area(struct user_desc __user *u_info) +{ + return do_set_thread_area(¤t->thread, u_info); +} + + +/* + * Get the current Thread-Local Storage area: + */ + +#define GET_LIMIT(desc) ( \ + ((desc)->a & 0x0ffff) | \ + ((desc)->b & 0xf0000) ) + +#define GET_32BIT(desc) (((desc)->b >> 22) & 1) +#define GET_CONTENTS(desc) (((desc)->b >> 10) & 3) +#define GET_WRITABLE(desc) (((desc)->b >> 9) & 1) +#define GET_LIMIT_PAGES(desc) (((desc)->b >> 23) & 1) +#define GET_PRESENT(desc) (((desc)->b >> 15) & 1) +#define GET_USEABLE(desc) (((desc)->b >> 20) & 1) +#define GET_LONGMODE(desc) (((desc)->b >> 21) & 1) + +int do_get_thread_area(struct thread_struct *t, struct user_desc __user *u_info) +{ + struct user_desc info; + struct n_desc_struct *desc; + int idx; + + if (get_user(idx, &u_info->entry_number)) + return -EFAULT; + if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX) + return -EINVAL; + + desc = ((struct n_desc_struct *)t->tls_array) + idx - GDT_ENTRY_TLS_MIN; + + memset(&info, 0, sizeof(struct user_desc)); + info.entry_number = idx; + info.base_addr = get_desc_base(desc); + info.limit = GET_LIMIT(desc); + info.seg_32bit = GET_32BIT(desc); + info.contents = GET_CONTENTS(desc); + info.read_exec_only = !GET_WRITABLE(desc); + info.limit_in_pages = GET_LIMIT_PAGES(desc); + info.seg_not_present = !GET_PRESENT(desc); + info.useable = GET_USEABLE(desc); + info.lm = GET_LONGMODE(desc); + + if (copy_to_user(u_info, &info, sizeof(info))) + return -EFAULT; + return 0; +} + +asmlinkage long sys32_get_thread_area(struct user_desc __user *u_info) +{ + return do_get_thread_area(¤t->thread, u_info); +} + + +int ia32_child_tls(struct task_struct *p, struct pt_regs *childregs) +{ + struct n_desc_struct *desc; + struct user_desc info; + struct user_desc __user *cp; + int idx; + + cp = (void __user *)childregs->rsi; + if (copy_from_user(&info, cp, sizeof(info))) + return -EFAULT; + if (LDT_empty(&info)) + return -EINVAL; + + idx = info.entry_number; + if (idx < GDT_ENTRY_TLS_MIN || idx > GDT_ENTRY_TLS_MAX) + return -EINVAL; + + desc = (struct n_desc_struct *)(p->thread.tls_array) + idx - GDT_ENTRY_TLS_MIN; + desc->a = LDT_entry_a(&info); + desc->b = LDT_entry_b(&info); + + return 0; +} - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/