[22/24] ARM64:ILP32: Use a seperate syscall table as a few syscalls need to be using the compat syscalls.

Message ID	1400914939-9708-23-git-send-email-apinski@cavium.com
State	New
Headers	show Return-Path: <patchwork-forward+bncBCHZN4WEQUCBBTMLQGOAKGQEELC2ECI@linaro.org> MIME-Version: 1.0 Received-SPF: pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 209.85.220.178 as permitted sender) client-ip=209.85.220.178; Received-SPF: none (google.com: linux-kernel-owner@vger.kernel.org does not designate permitted sender hosts) client-ip=209.132.180.67; From: Andrew Pinski <apinski@cavium.com> To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Andrew Pinski <apinski@cavium.com> Subject: [PATCH 22/24] ARM64:ILP32: Use a seperate syscall table as a few syscalls need to be using the compat syscalls. Date: Sat, 24 May 2014 00:02:17 -0700 Message-Id: <1400914939-9708-23-git-send-email-apinski@cavium.com> In-Reply-To: <1400914939-9708-1-git-send-email-apinski@cavium.com> References: <1400914939-9708-1-git-send-email-apinski@cavium.com> To: linux-arm-kernel@lists.infradead.org To: linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org Precedence: list Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org

diff --git a/arch/arm64/include/asm/syscalls.h b/arch/arm64/include/asm/syscalls.h index 48fe7c6..b58dad7 100644 --- a/arch/arm64/include/asm/syscalls.h +++ b/arch/arm64/include/asm/syscalls.h @@ -25,6 +25,10 @@ */ asmlinkage long sys_rt_sigreturn_wrapper(void); +#ifdef CONFIG_ARM64_ILP32 +long ilp32_sys_sigaltstack(const stack_t __user *, stack_t __user *); +#endif + #include <asm-generic/syscalls.h> #endif /* __ASM_SYSCALLS_H */ diff --git a/arch/arm64/include/asm/unistd.h b/arch/arm64/include/asm/unistd.h index 11502bd..831c7b6 100644 --- a/arch/arm64/include/asm/unistd.h +++ b/arch/arm64/include/asm/unistd.h @@ -13,6 +13,10 @@ * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ +#ifdef CONFIG_ARM64_ILP32 +#define __ARCH_WANT_COMPAT_SYS_PREADV64 +#define __ARCH_WANT_COMPAT_SYS_PWRITEV64 +#endif #ifdef CONFIG_AARCH32_EL0 #define __ARCH_WANT_COMPAT_SYS_GETDENTS64 #define __ARCH_WANT_COMPAT_STAT64 diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile index 986962d..b5884a1 100644 --- a/arch/arm64/kernel/Makefile +++ b/arch/arm64/kernel/Makefile @@ -13,6 +13,7 @@ arm64-obj-y := cputable.o debug-monitors.o entry.o irq.o fpsimd.o \ arm64-obj-$(CONFIG_AARCH32_EL0) += sys32.o kuser32.o signal32.o \ sys_compat.o +arm64-obj-$(CONFIG_ARM64_ILP32) += sys_ilp32.o arm64-obj-$(CONFIG_MODULES) += arm64ksyms.o module.o arm64-obj-$(CONFIG_SMP) += smp.o smp_spin_table.o topology.o arm64-obj-$(CONFIG_PERF_EVENTS) += perf_regs.o diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S index 1e1ebfc..8241ffe 100644 --- a/arch/arm64/kernel/entry.S +++ b/arch/arm64/kernel/entry.S @@ -620,9 +620,14 @@ ENDPROC(ret_from_fork) */ .align 6 el0_svc: - adrp stbl, sys_call_table // load syscall table pointer uxtw scno, w8 // syscall number in w8 mov sc_nr, #__NR_syscalls +#ifdef CONFIG_ARM64_ILP32 + get_thread_info tsk + ldr x16, [tsk, #TI_FLAGS] + tbnz x16, #TIF_32BIT_AARCH64, el0_ilp32_svc // We are using ILP32 +#endif + adrp stbl, sys_call_table // load syscall table pointer el0_svc_naked: // compat entry point stp x0, scno, [sp, #S_ORIG_X0] // save the original x0 and syscall number disable_step x16 @@ -643,6 +648,12 @@ ni_sys: b do_ni_syscall ENDPROC(el0_svc) +#ifdef CONFIG_ARM64_ILP32 +el0_ilp32_svc: + adrp stbl, sys_call_ilp32_table // load syscall table pointer + b el0_svc_naked +#endif + /* * This is the really slow path. We're going to be doing context * switches, and waiting for our parent to respond. diff --git a/arch/arm64/kernel/sys_ilp32.c b/arch/arm64/kernel/sys_ilp32.c new file mode 100644 index 0000000..1da1d11 --- /dev/null +++ b/arch/arm64/kernel/sys_ilp32.c @@ -0,0 +1,175 @@ +/* + * AArch64- ILP32 specific system calls implementation + * + * Copyright (C) 2013 Cavium Inc. + * Author: Andrew Pinski <apinski@cavium.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/compiler.h> +#include <linux/errno.h> +#include <linux/fs.h> +#include <linux/mm.h> +#include <linux/export.h> +#include <linux/sched.h> +#include <linux/slab.h> +#include <linux/syscalls.h> +#include <linux/compat.h> + +/* + * Wrappers to pass the pt_regs argument. + */ +#define sys_rt_sigreturn sys_rt_sigreturn_wrapper + + +/* Using Compat syscalls where necessary */ +#define sys_ioctl compat_sys_ioctl +/* iovec */ +#define sys_readv compat_sys_readv +#define sys_writev compat_sys_writev +#define sys_preadv compat_sys_preadv64 +#define sys_pwritev compat_sys_pwritev64 +#define sys_vmsplice compat_sys_vmsplice +/* robust_list_head */ +#define sys_set_robust_list compat_sys_set_robust_list +#define sys_get_robust_list compat_sys_get_robust_list + +/* kexec_segment */ +#define sys_kexec_load compat_sys_kexec_load + +/* Ptrace has some structures which are different between ILP32 and LP64 */ +#define sys_ptrace compat_sys_ptrace + +/* struct msghdr */ +#define sys_recvfrom compat_sys_recvfrom +#define sys_recvmmsg compat_sys_recvmmsg +#define sys_sendmmsg compat_sys_sendmmsg +#define sys_sendmsg compat_sys_sendmsg +#define sys_recvmsg compat_sys_recvmsg + +#define sys_setsockopt compat_sys_setsockopt +#define sys_getsockopt compat_sys_getsockopt + +/* Array of pointers */ +#define sys_execve compat_sys_execve +#define sys_move_pages compat_sys_move_pages + +/* iovec */ +#define sys_process_vm_readv compat_sys_process_vm_readv +#define sys_process_vm_writev compat_sys_process_vm_writev + +/* Pointer in struct */ +#define sys_mount compat_sys_mount + +/* NUMA */ +/* unsigned long bitmaps */ +#define sys_get_mempolicy compat_sys_get_mempolicy +#define sys_set_mempolicy compat_sys_set_mempolicy +#define sys_mbind compat_sys_mbind +/* array of pointers */ +/* unsigned long bitmaps */ +#define sys_migrate_pages compat_sys_migrate_pages + +/* Scheduler */ +/* unsigned long bitmaps */ +#define sys_sched_setaffinity compat_sys_sched_setaffinity +#define sys_sched_getaffinity compat_sys_sched_getaffinity + +/* iov usage */ +#define sys_keyctl compat_sys_keyctl + +/* aio */ +/* Pointer to Pointer */ +#define sys_io_setup compat_sys_io_setup +/* Array of pointers */ +#define sys_io_submit compat_sys_io_submit + +/* We need to make sure the pointer gets copied correctly. */ +asmlinkage long ilp32_sys_mq_notify(mqd_t mqdes, + const struct sigevent __user *u_notification) +{ + struct sigevent __user *p = NULL; + if (u_notification) { + struct sigevent n; + p = compat_alloc_user_space(sizeof(*p)); + if (copy_from_user(&n, u_notification, sizeof(*p))) + return -EFAULT; + if (n.sigev_notify == SIGEV_THREAD) + n.sigev_value.sival_ptr = compat_ptr((uintptr_t)n.sigev_value.sival_ptr); + if (copy_to_user(p, &n, sizeof(*p))) + return -EFAULT; + } + return sys_mq_notify(mqdes, p); +} + +/* sigevent contains sigval_t which is now 64bit always + but need special handling due to padding for SIGEV_THREAD. */ +#define sys_mq_notify ilp32_sys_mq_notify + + +/* sigaltstack needs some special handling as the + padding for stack_t might not be non-zero. */ +long ilp32_sys_sigaltstack(const stack_t __user *uss_ptr, + stack_t __user *uoss_ptr) +{ + stack_t uss, uoss; + int ret; + mm_segment_t seg; + + if (uss_ptr) { + if (!access_ok(VERIFY_READ, uss_ptr, sizeof(*uss_ptr))) + return -EFAULT; + if (__get_user(uss.ss_sp, &uss_ptr->ss_sp) | + __get_user(uss.ss_flags, &uss_ptr->ss_flags) | + __get_user(uss.ss_size, &uss_ptr->ss_size)) + return -EFAULT; + /* Zero extend the sp address and the size. */ + uss.ss_sp = (void *)(uintptr_t)(unsigned int)(uintptr_t)uss.ss_sp; + uss.ss_size = (size_t)(unsigned int)uss.ss_size; + } + seg = get_fs(); + set_fs(KERNEL_DS); + /* Note we need to use uoss as we have changed the segment to the + kernel one so passing an user one around is wrong. */ + ret = sys_sigaltstack((stack_t __force __user *) (uss_ptr ? &uss : NULL), + (stack_t __force __user *) &uoss); + set_fs(seg); + if (ret >= 0 && uoss_ptr) { + if (!access_ok(VERIFY_WRITE, uoss_ptr, sizeof(stack_t)) || + __put_user(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; +} + +/* sigaltstack needs some special handling as the padding + for stack_t might not be non-zero. */ +#define sys_sigaltstack ilp32_sys_sigaltstack + + +#include <asm/syscalls.h> + +#undef __SYSCALL +#define __SYSCALL(nr, sym) [nr] = sym, + +/* + * The sys_call_ilp32_table array must be 4K aligned to be accessible from + * kernel/entry.S. + */ +void *sys_call_ilp32_table[__NR_syscalls] __aligned(4096) = { + [0 ... __NR_syscalls - 1] = sys_ni_syscall, +#include <asm/unistd.h> +};

[22/24] ARM64:ILP32: Use a seperate syscall table as a few syscalls need to be using the compat syscalls.

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