From 3dd681d944f6d861f12ee03aff17a14342963330 Mon Sep 17 00:00:00 2001 From: Will Deacon Date: Mon, 5 Mar 2012 11:49:32 +0000 Subject: arm64: 32-bit (compat) applications support This patch adds support for 32-bit applications. The vectors page is a binary blob mapped into the application user space at 0xffff0000 (the AArch64 toolchain does not support compilation of AArch32 code). Full compatibility with ARMv7 user space is supported. The use of deprecated ARMv7 functionality (SWP, CP15 barriers) has been disabled by default on AArch64 kernels and unaligned LDM/STM is not supported. Please note that only the ARM 32-bit EABI is supported, so no OABI compatibility. Signed-off-by: Will Deacon Signed-off-by: Catalin Marinas Acked-by: Tony Lindgren Acked-by: Nicolas Pitre Acked-by: Olof Johansson Acked-by: Santosh Shilimkar --- arch/arm64/kernel/kuser32.S | 77 ++++ arch/arm64/kernel/signal32.c | 876 +++++++++++++++++++++++++++++++++++++++++ arch/arm64/kernel/sys32.S | 282 +++++++++++++ arch/arm64/kernel/sys_compat.c | 164 ++++++++ 4 files changed, 1399 insertions(+) create mode 100644 arch/arm64/kernel/kuser32.S create mode 100644 arch/arm64/kernel/signal32.c create mode 100644 arch/arm64/kernel/sys32.S create mode 100644 arch/arm64/kernel/sys_compat.c (limited to 'arch/arm64/kernel') diff --git a/arch/arm64/kernel/kuser32.S b/arch/arm64/kernel/kuser32.S new file mode 100644 index 000000000000..8b69ecb1d8bc --- /dev/null +++ b/arch/arm64/kernel/kuser32.S @@ -0,0 +1,77 @@ +/* + * Low-level user helpers placed in the vectors page for AArch32. + * Based on the kuser helpers in arch/arm/kernel/entry-armv.S. + * + * Copyright (C) 2005-2011 Nicolas Pitre + * Copyright (C) 2012 ARM Ltd. + * + * 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 . + * + * + * AArch32 user helpers. + * + * Each segment is 32-byte aligned and will be moved to the top of the high + * vector page. New segments (if ever needed) must be added in front of + * existing ones. This mechanism should be used only for things that are + * really small and justified, and not be abused freely. + * + * See Documentation/arm/kernel_user_helpers.txt for formal definitions. + */ + .align 5 + .globl __kuser_helper_start +__kuser_helper_start: + +__kuser_cmpxchg64: // 0xffff0f60 + .inst 0xe92d00f0 // push {r4, r5, r6, r7} + .inst 0xe1c040d0 // ldrd r4, r5, [r0] + .inst 0xe1c160d0 // ldrd r6, r7, [r1] + .inst 0xf57ff05f // dmb sy + .inst 0xe1b20f9f // 1: ldrexd r0, r1, [r2] + .inst 0xe0303004 // eors r3, r0, r4 + .inst 0x00313005 // eoreqs r3, r1, r5 + .inst 0x01a23f96 // strexdeq r3, r6, [r2] + .inst 0x03330001 // teqeq r3, #1 + .inst 0x0afffff9 // beq 1b + .inst 0xf57ff05f // dmb sy + .inst 0xe2730000 // rsbs r0, r3, #0 + .inst 0xe8bd00f0 // pop {r4, r5, r6, r7} + .inst 0xe12fff1e // bx lr + + .align 5 +__kuser_memory_barrier: // 0xffff0fa0 + .inst 0xf57ff05f // dmb sy + .inst 0xe12fff1e // bx lr + + .align 5 +__kuser_cmpxchg: // 0xffff0fc0 + .inst 0xf57ff05f // dmb sy + .inst 0xe1923f9f // 1: ldrex r3, [r2] + .inst 0xe0533000 // subs r3, r3, r0 + .inst 0x01823f91 // strexeq r3, r1, [r2] + .inst 0x03330001 // teqeq r3, #1 + .inst 0x0afffffa // beq 1b + .inst 0xe2730000 // rsbs r0, r3, #0 + .inst 0xeaffffef // b <__kuser_memory_barrier> + + .align 5 +__kuser_get_tls: // 0xffff0fe0 + .inst 0xee1d0f70 // mrc p15, 0, r0, c13, c0, 3 + .inst 0xe12fff1e // bx lr + .rep 5 + .word 0 + .endr + +__kuser_helper_version: // 0xffff0ffc + .word ((__kuser_helper_end - __kuser_helper_start) >> 5) + .globl __kuser_helper_end +__kuser_helper_end: diff --git a/arch/arm64/kernel/signal32.c b/arch/arm64/kernel/signal32.c new file mode 100644 index 000000000000..ac74c2f261e3 --- /dev/null +++ b/arch/arm64/kernel/signal32.c @@ -0,0 +1,876 @@ +/* + * Based on arch/arm/kernel/signal.c + * + * Copyright (C) 1995-2009 Russell King + * Copyright (C) 2012 ARM Ltd. + * Modified by Will Deacon + * + * 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 . + */ + +#define __SYSCALL_COMPAT + +#include +#include +#include +#include + +#include +#include +#include +#include + +typedef struct compat_siginfo { + int si_signo; + int si_errno; + int si_code; + + union { + /* The padding is the same size as AArch64. */ + int _pad[SI_PAD_SIZE]; + + /* kill() */ + struct { + compat_pid_t _pid; /* sender's pid */ + __compat_uid32_t _uid; /* sender's uid */ + } _kill; + + /* POSIX.1b timers */ + struct { + compat_timer_t _tid; /* timer id */ + int _overrun; /* overrun count */ + compat_sigval_t _sigval; /* same as below */ + int _sys_private; /* not to be passed to user */ + } _timer; + + /* POSIX.1b signals */ + struct { + compat_pid_t _pid; /* sender's pid */ + __compat_uid32_t _uid; /* sender's uid */ + compat_sigval_t _sigval; + } _rt; + + /* SIGCHLD */ + struct { + compat_pid_t _pid; /* which child */ + __compat_uid32_t _uid; /* sender's uid */ + int _status; /* exit code */ + compat_clock_t _utime; + compat_clock_t _stime; + } _sigchld; + + /* SIGILL, SIGFPE, SIGSEGV, SIGBUS */ + struct { + compat_uptr_t _addr; /* faulting insn/memory ref. */ + short _addr_lsb; /* LSB of the reported address */ + } _sigfault; + + /* SIGPOLL */ + struct { + compat_long_t _band; /* POLL_IN, POLL_OUT, POLL_MSG */ + int _fd; + } _sigpoll; + } _sifields; +} compat_siginfo_t; + +struct compat_sigaction { + compat_uptr_t sa_handler; + compat_ulong_t sa_flags; + compat_uptr_t sa_restorer; + compat_sigset_t sa_mask; +}; + +struct compat_old_sigaction { + compat_uptr_t sa_handler; + compat_old_sigset_t sa_mask; + compat_ulong_t sa_flags; + compat_uptr_t sa_restorer; +}; + +typedef struct compat_sigaltstack { + compat_uptr_t ss_sp; + int ss_flags; + compat_size_t ss_size; +} compat_stack_t; + +struct compat_sigcontext { + /* We always set these two fields to 0 */ + compat_ulong_t trap_no; + compat_ulong_t error_code; + + compat_ulong_t oldmask; + compat_ulong_t arm_r0; + compat_ulong_t arm_r1; + compat_ulong_t arm_r2; + compat_ulong_t arm_r3; + compat_ulong_t arm_r4; + compat_ulong_t arm_r5; + compat_ulong_t arm_r6; + compat_ulong_t arm_r7; + compat_ulong_t arm_r8; + compat_ulong_t arm_r9; + compat_ulong_t arm_r10; + compat_ulong_t arm_fp; + compat_ulong_t arm_ip; + compat_ulong_t arm_sp; + compat_ulong_t arm_lr; + compat_ulong_t arm_pc; + compat_ulong_t arm_cpsr; + compat_ulong_t fault_address; +}; + +struct compat_ucontext { + compat_ulong_t uc_flags; + struct compat_ucontext *uc_link; + compat_stack_t uc_stack; + struct compat_sigcontext uc_mcontext; + compat_sigset_t uc_sigmask; + int __unused[32 - (sizeof (compat_sigset_t) / sizeof (int))]; + compat_ulong_t uc_regspace[128] __attribute__((__aligned__(8))); +}; + +struct compat_vfp_sigframe { + compat_ulong_t magic; + compat_ulong_t size; + struct compat_user_vfp { + compat_u64 fpregs[32]; + compat_ulong_t fpscr; + } ufp; + struct compat_user_vfp_exc { + compat_ulong_t fpexc; + compat_ulong_t fpinst; + compat_ulong_t fpinst2; + } ufp_exc; +} __attribute__((__aligned__(8))); + +#define VFP_MAGIC 0x56465001 +#define VFP_STORAGE_SIZE sizeof(struct compat_vfp_sigframe) + +struct compat_aux_sigframe { + struct compat_vfp_sigframe vfp; + + /* Something that isn't a valid magic number for any coprocessor. */ + unsigned long end_magic; +} __attribute__((__aligned__(8))); + +struct compat_sigframe { + struct compat_ucontext uc; + compat_ulong_t retcode[2]; +}; + +struct compat_rt_sigframe { + struct compat_siginfo info; + struct compat_sigframe sig; +}; + +#define _BLOCKABLE (~(sigmask(SIGKILL) | sigmask(SIGSTOP))) + +/* + * For ARM syscalls, the syscall number has to be loaded into r7. + * We do not support an OABI userspace. + */ +#define MOV_R7_NR_SIGRETURN (0xe3a07000 | __NR_sigreturn) +#define SVC_SYS_SIGRETURN (0xef000000 | __NR_sigreturn) +#define MOV_R7_NR_RT_SIGRETURN (0xe3a07000 | __NR_rt_sigreturn) +#define SVC_SYS_RT_SIGRETURN (0xef000000 | __NR_rt_sigreturn) + +/* + * For Thumb syscalls, we also pass the syscall number via r7. We therefore + * need two 16-bit instructions. + */ +#define SVC_THUMB_SIGRETURN (((0xdf00 | __NR_sigreturn) << 16) | \ + 0x2700 | __NR_sigreturn) +#define SVC_THUMB_RT_SIGRETURN (((0xdf00 | __NR_rt_sigreturn) << 16) | \ + 0x2700 | __NR_rt_sigreturn) + +const compat_ulong_t aarch32_sigret_code[6] = { + /* + * AArch32 sigreturn code. + * We don't construct an OABI SWI - instead we just set the imm24 field + * to the EABI syscall number so that we create a sane disassembly. + */ + MOV_R7_NR_SIGRETURN, SVC_SYS_SIGRETURN, SVC_THUMB_SIGRETURN, + MOV_R7_NR_RT_SIGRETURN, SVC_SYS_RT_SIGRETURN, SVC_THUMB_RT_SIGRETURN, +}; + +static inline int put_sigset_t(compat_sigset_t __user *uset, sigset_t *set) +{ + compat_sigset_t cset; + + cset.sig[0] = set->sig[0] & 0xffffffffull; + cset.sig[1] = set->sig[0] >> 32; + + return copy_to_user(uset, &cset, sizeof(*uset)); +} + +static inline int get_sigset_t(sigset_t *set, + const compat_sigset_t __user *uset) +{ + compat_sigset_t s32; + + if (copy_from_user(&s32, uset, sizeof(*uset))) + return -EFAULT; + + set->sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32); + return 0; +} + +int copy_siginfo_to_user32(compat_siginfo_t __user *to, siginfo_t *from) +{ + int err; + + if (!access_ok(VERIFY_WRITE, to, sizeof(*to))) + return -EFAULT; + + /* If you change siginfo_t structure, please be sure + * this code is fixed accordingly. + * It should never copy any pad contained in the structure + * to avoid security leaks, but must copy the generic + * 3 ints plus the relevant union member. + * This routine must convert siginfo from 64bit to 32bit as well + * at the same time. + */ + err = __put_user(from->si_signo, &to->si_signo); + err |= __put_user(from->si_errno, &to->si_errno); + err |= __put_user((short)from->si_code, &to->si_code); + if (from->si_code < 0) + err |= __copy_to_user(&to->_sifields._pad, &from->_sifields._pad, + SI_PAD_SIZE); + else switch (from->si_code & __SI_MASK) { + case __SI_KILL: + err |= __put_user(from->si_pid, &to->si_pid); + err |= __put_user(from->si_uid, &to->si_uid); + break; + case __SI_TIMER: + err |= __put_user(from->si_tid, &to->si_tid); + err |= __put_user(from->si_overrun, &to->si_overrun); + err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr, + &to->si_ptr); + break; + case __SI_POLL: + err |= __put_user(from->si_band, &to->si_band); + err |= __put_user(from->si_fd, &to->si_fd); + break; + case __SI_FAULT: + err |= __put_user((compat_uptr_t)(unsigned long)from->si_addr, + &to->si_addr); +#ifdef BUS_MCEERR_AO + /* + * Other callers might not initialize the si_lsb field, + * so check explicitely for the right codes here. + */ + if (from->si_code == BUS_MCEERR_AR || from->si_code == BUS_MCEERR_AO) + err |= __put_user(from->si_addr_lsb, &to->si_addr_lsb); +#endif + break; + case __SI_CHLD: + err |= __put_user(from->si_pid, &to->si_pid); + err |= __put_user(from->si_uid, &to->si_uid); + err |= __put_user(from->si_status, &to->si_status); + err |= __put_user(from->si_utime, &to->si_utime); + err |= __put_user(from->si_stime, &to->si_stime); + break; + case __SI_RT: /* This is not generated by the kernel as of now. */ + case __SI_MESGQ: /* But this is */ + err |= __put_user(from->si_pid, &to->si_pid); + err |= __put_user(from->si_uid, &to->si_uid); + err |= __put_user((compat_uptr_t)(unsigned long)from->si_ptr, &to->si_ptr); + break; + default: /* this is just in case for now ... */ + err |= __put_user(from->si_pid, &to->si_pid); + err |= __put_user(from->si_uid, &to->si_uid); + break; + } + return err; +} + +int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from) +{ + memset(to, 0, sizeof *to); + + if (copy_from_user(to, from, __ARCH_SI_PREAMBLE_SIZE) || + copy_from_user(to->_sifields._pad, + from->_sifields._pad, SI_PAD_SIZE)) + return -EFAULT; + + return 0; +} + +/* + * VFP save/restore code. + */ +static int compat_preserve_vfp_context(struct compat_vfp_sigframe __user *frame) +{ + struct fpsimd_state *fpsimd = ¤t->thread.fpsimd_state; + compat_ulong_t magic = VFP_MAGIC; + compat_ulong_t size = VFP_STORAGE_SIZE; + compat_ulong_t fpscr, fpexc; + int err = 0; + + /* + * Save the hardware registers to the fpsimd_state structure. + * Note that this also saves V16-31, which aren't visible + * in AArch32. + */ + fpsimd_save_state(fpsimd); + + /* Place structure header on the stack */ + __put_user_error(magic, &frame->magic, err); + __put_user_error(size, &frame->size, err); + + /* + * Now copy the FP registers. Since the registers are packed, + * we can copy the prefix we want (V0-V15) as it is. + * FIXME: Won't work if big endian. + */ + err |= __copy_to_user(&frame->ufp.fpregs, fpsimd->vregs, + sizeof(frame->ufp.fpregs)); + + /* Create an AArch32 fpscr from the fpsr and the fpcr. */ + fpscr = (fpsimd->fpsr & VFP_FPSCR_STAT_MASK) | + (fpsimd->fpcr & VFP_FPSCR_CTRL_MASK); + __put_user_error(fpscr, &frame->ufp.fpscr, err); + + /* + * The exception register aren't available so we fake up a + * basic FPEXC and zero everything else. + */ + fpexc = (1 << 30); + __put_user_error(fpexc, &frame->ufp_exc.fpexc, err); + __put_user_error(0, &frame->ufp_exc.fpinst, err); + __put_user_error(0, &frame->ufp_exc.fpinst2, err); + + return err ? -EFAULT : 0; +} + +static int compat_restore_vfp_context(struct compat_vfp_sigframe __user *frame) +{ + struct fpsimd_state fpsimd; + compat_ulong_t magic = VFP_MAGIC; + compat_ulong_t size = VFP_STORAGE_SIZE; + compat_ulong_t fpscr; + int err = 0; + + __get_user_error(magic, &frame->magic, err); + __get_user_error(size, &frame->size, err); + + if (err) + return -EFAULT; + if (magic != VFP_MAGIC || size != VFP_STORAGE_SIZE) + return -EINVAL; + + /* + * Copy the FP registers into the start of the fpsimd_state. + * FIXME: Won't work if big endian. + */ + err |= __copy_from_user(fpsimd.vregs, frame->ufp.fpregs, + sizeof(frame->ufp.fpregs)); + + /* Extract the fpsr and the fpcr from the fpscr */ + __get_user_error(fpscr, &frame->ufp.fpscr, err); + fpsimd.fpsr = fpscr & VFP_FPSCR_STAT_MASK; + fpsimd.fpcr = fpscr & VFP_FPSCR_CTRL_MASK; + + /* + * We don't need to touch the exception register, so + * reload the hardware state. + */ + if (!err) { + preempt_disable(); + fpsimd_load_state(&fpsimd); + preempt_enable(); + } + + return err ? -EFAULT : 0; +} + +/* + * atomically swap in the new signal mask, and wait for a signal. + */ +asmlinkage int compat_sys_sigsuspend(int restart, compat_ulong_t oldmask, + compat_old_sigset_t mask) +{ + sigset_t blocked; + + siginitset(¤t->blocked, mask); + return sigsuspend(&blocked); +} + +asmlinkage int compat_sys_sigaction(int sig, + const struct compat_old_sigaction __user *act, + struct compat_old_sigaction __user *oact) +{ + struct k_sigaction new_ka, old_ka; + int ret; + compat_old_sigset_t mask; + compat_uptr_t handler, restorer; + + if (act) { + if (!access_ok(VERIFY_READ, act, sizeof(*act)) || + __get_user(handler, &act->sa_handler) || + __get_user(restorer, &act->sa_restorer) || + __get_user(new_ka.sa.sa_flags, &act->sa_flags) || + __get_user(mask, &act->sa_mask)) + return -EFAULT; + + new_ka.sa.sa_handler = compat_ptr(handler); + new_ka.sa.sa_restorer = compat_ptr(restorer); + 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(ptr_to_compat(old_ka.sa.sa_handler), + &oact->sa_handler) || + __put_user(ptr_to_compat(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 int compat_sys_rt_sigaction(int sig, + const struct compat_sigaction __user *act, + struct compat_sigaction __user *oact, + compat_size_t sigsetsize) +{ + struct k_sigaction new_ka, old_ka; + int ret; + + /* XXX: Don't preclude handling different sized sigset_t's. */ + if (sigsetsize != sizeof(compat_sigset_t)) + return -EINVAL; + + if (act) { + compat_uptr_t handler, restorer; + + ret = get_user(handler, &act->sa_handler); + new_ka.sa.sa_handler = compat_ptr(handler); + ret |= get_user(restorer, &act->sa_restorer); + new_ka.sa.sa_restorer = compat_ptr(restorer); + ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask); + ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags); + if (ret) + return -EFAULT; + } + + ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL); + if (!ret && oact) { + ret = put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler); + ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask); + ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags); + } + return ret; +} + +int compat_do_sigaltstack(compat_uptr_t compat_uss, compat_uptr_t compat_uoss, + compat_ulong_t sp) +{ + compat_stack_t __user *newstack = compat_ptr(compat_uss); + compat_stack_t __user *oldstack = compat_ptr(compat_uoss); + compat_uptr_t ss_sp; + int ret; + mm_segment_t old_fs; + stack_t uss, uoss; + + /* Marshall the compat new stack into a stack_t */ + if (newstack) { + if (get_user(ss_sp, &newstack->ss_sp) || + __get_user(uss.ss_flags, &newstack->ss_flags) || + __get_user(uss.ss_size, &newstack->ss_size)) + return -EFAULT; + uss.ss_sp = compat_ptr(ss_sp); + } + + old_fs = get_fs(); + set_fs(KERNEL_DS); + /* The __user pointer casts are valid because of the set_fs() */ + ret = do_sigaltstack( + newstack ? (stack_t __user *) &uss : NULL, + oldstack ? (stack_t __user *) &uoss : NULL, + (unsigned long)sp); + set_fs(old_fs); + + /* Convert the old stack_t into a compat stack. */ + if (!ret && oldstack && + (put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) || + __put_user(uoss.ss_flags, &oldstack->ss_flags) || + __put_user(uoss.ss_size, &oldstack->ss_size))) + return -EFAULT; + return ret; +} + +static int compat_restore_sigframe(struct pt_regs *regs, + struct compat_sigframe __user *sf) +{ + int err; + sigset_t set; + struct compat_aux_sigframe __user *aux; + + err = get_sigset_t(&set, &sf->uc.uc_sigmask); + if (err == 0) { + sigdelsetmask(&set, ~_BLOCKABLE); + set_current_blocked(&set); + } + + __get_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err); + __get_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err); + __get_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err); + __get_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err); + __get_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err); + __get_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err); + __get_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err); + __get_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err); + __get_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err); + __get_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err); + __get_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err); + __get_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err); + __get_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err); + __get_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err); + __get_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err); + __get_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err); + __get_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err); + + /* + * Avoid compat_sys_sigreturn() restarting. + */ + regs->syscallno = ~0UL; + + err |= !valid_user_regs(®s->user_regs); + + aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace; + if (err == 0) + err |= compat_restore_vfp_context(&aux->vfp); + + return err; +} + +asmlinkage int compat_sys_sigreturn(struct pt_regs *regs) +{ + struct compat_sigframe __user *frame; + + /* Always make any pending restarted system calls return -EINTR */ + current_thread_info()->restart_block.fn = do_no_restart_syscall; + + /* + * Since we stacked the signal on a 64-bit boundary, + * then 'sp' should be word aligned here. If it's + * not, then the user is trying to mess with us. + */ + if (regs->compat_sp & 7) + goto badframe; + + frame = (struct compat_sigframe __user *)regs->compat_sp; + + if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) + goto badframe; + + if (compat_restore_sigframe(regs, frame)) + goto badframe; + + return regs->regs[0]; + +badframe: + if (show_unhandled_signals) + pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n", + current->comm, task_pid_nr(current), __func__, + regs->pc, regs->sp); + force_sig(SIGSEGV, current); + return 0; +} + +asmlinkage int compat_sys_rt_sigreturn(struct pt_regs *regs) +{ + struct compat_rt_sigframe __user *frame; + + /* Always make any pending restarted system calls return -EINTR */ + current_thread_info()->restart_block.fn = do_no_restart_syscall; + + /* + * Since we stacked the signal on a 64-bit boundary, + * then 'sp' should be word aligned here. If it's + * not, then the user is trying to mess with us. + */ + if (regs->compat_sp & 7) + goto badframe; + + frame = (struct compat_rt_sigframe __user *)regs->compat_sp; + + if (!access_ok(VERIFY_READ, frame, sizeof (*frame))) + goto badframe; + + if (compat_restore_sigframe(regs, &frame->sig)) + goto badframe; + + if (compat_do_sigaltstack(ptr_to_compat(&frame->sig.uc.uc_stack), + ptr_to_compat((void __user *)NULL), + regs->compat_sp) == -EFAULT) + goto badframe; + + return regs->regs[0]; + +badframe: + if (show_unhandled_signals) + pr_info_ratelimited("%s[%d]: bad frame in %s: pc=%08llx sp=%08llx\n", + current->comm, task_pid_nr(current), __func__, + regs->pc, regs->sp); + force_sig(SIGSEGV, current); + return 0; +} + +static inline void __user *compat_get_sigframe(struct k_sigaction *ka, + struct pt_regs *regs, + int framesize) +{ + compat_ulong_t sp = regs->compat_sp; + void __user *frame; + + /* + * This is the X/Open sanctioned signal stack switching. + */ + if ((ka->sa.sa_flags & SA_ONSTACK) && !sas_ss_flags(sp)) + sp = current->sas_ss_sp + current->sas_ss_size; + + /* + * ATPCS B01 mandates 8-byte alignment + */ + frame = compat_ptr((compat_uptr_t)((sp - framesize) & ~7)); + + /* + * Check that we can actually write to the signal frame. + */ + if (!access_ok(VERIFY_WRITE, frame, framesize)) + frame = NULL; + + return frame; +} + +static int compat_setup_return(struct pt_regs *regs, struct k_sigaction *ka, + compat_ulong_t __user *rc, void __user *frame, + int usig) +{ + compat_ulong_t handler = ptr_to_compat(ka->sa.sa_handler); + compat_ulong_t retcode; + compat_ulong_t spsr = regs->pstate & ~PSR_f; + int thumb; + + /* Check if the handler is written for ARM or Thumb */ + thumb = handler & 1; + + if (thumb) { + spsr |= COMPAT_PSR_T_BIT; + spsr &= ~COMPAT_PSR_IT_MASK; + } else { + spsr &= ~COMPAT_PSR_T_BIT; + } + + if (ka->sa.sa_flags & SA_RESTORER) { + retcode = ptr_to_compat(ka->sa.sa_restorer); + } else { + /* Set up sigreturn pointer */ + unsigned int idx = thumb << 1; + + if (ka->sa.sa_flags & SA_SIGINFO) + idx += 3; + + retcode = AARCH32_VECTORS_BASE + + AARCH32_KERN_SIGRET_CODE_OFFSET + + (idx << 2) + thumb; + } + + regs->regs[0] = usig; + regs->compat_sp = ptr_to_compat(frame); + regs->compat_lr = retcode; + regs->pc = handler; + regs->pstate = spsr; + + return 0; +} + +static int compat_setup_sigframe(struct compat_sigframe __user *sf, + struct pt_regs *regs, sigset_t *set) +{ + struct compat_aux_sigframe __user *aux; + int err = 0; + + __put_user_error(regs->regs[0], &sf->uc.uc_mcontext.arm_r0, err); + __put_user_error(regs->regs[1], &sf->uc.uc_mcontext.arm_r1, err); + __put_user_error(regs->regs[2], &sf->uc.uc_mcontext.arm_r2, err); + __put_user_error(regs->regs[3], &sf->uc.uc_mcontext.arm_r3, err); + __put_user_error(regs->regs[4], &sf->uc.uc_mcontext.arm_r4, err); + __put_user_error(regs->regs[5], &sf->uc.uc_mcontext.arm_r5, err); + __put_user_error(regs->regs[6], &sf->uc.uc_mcontext.arm_r6, err); + __put_user_error(regs->regs[7], &sf->uc.uc_mcontext.arm_r7, err); + __put_user_error(regs->regs[8], &sf->uc.uc_mcontext.arm_r8, err); + __put_user_error(regs->regs[9], &sf->uc.uc_mcontext.arm_r9, err); + __put_user_error(regs->regs[10], &sf->uc.uc_mcontext.arm_r10, err); + __put_user_error(regs->regs[11], &sf->uc.uc_mcontext.arm_fp, err); + __put_user_error(regs->regs[12], &sf->uc.uc_mcontext.arm_ip, err); + __put_user_error(regs->compat_sp, &sf->uc.uc_mcontext.arm_sp, err); + __put_user_error(regs->compat_lr, &sf->uc.uc_mcontext.arm_lr, err); + __put_user_error(regs->pc, &sf->uc.uc_mcontext.arm_pc, err); + __put_user_error(regs->pstate, &sf->uc.uc_mcontext.arm_cpsr, err); + + __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.trap_no, err); + __put_user_error((compat_ulong_t)0, &sf->uc.uc_mcontext.error_code, err); + __put_user_error(current->thread.fault_address, &sf->uc.uc_mcontext.fault_address, err); + __put_user_error(set->sig[0], &sf->uc.uc_mcontext.oldmask, err); + + err |= put_sigset_t(&sf->uc.uc_sigmask, set); + + aux = (struct compat_aux_sigframe __user *) sf->uc.uc_regspace; + + if (err == 0) + err |= compat_preserve_vfp_context(&aux->vfp); + __put_user_error(0, &aux->end_magic, err); + + return err; +} + +/* + * 32-bit signal handling routines called from signal.c + */ +int compat_setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info, + sigset_t *set, struct pt_regs *regs) +{ + struct compat_rt_sigframe __user *frame; + compat_stack_t stack; + int err = 0; + + frame = compat_get_sigframe(ka, regs, sizeof(*frame)); + + if (!frame) + return 1; + + err |= copy_siginfo_to_user32(&frame->info, info); + + __put_user_error(0, &frame->sig.uc.uc_flags, err); + __put_user_error(NULL, &frame->sig.uc.uc_link, err); + + memset(&stack, 0, sizeof(stack)); + stack.ss_sp = (compat_uptr_t)current->sas_ss_sp; + stack.ss_flags = sas_ss_flags(regs->compat_sp); + stack.ss_size = current->sas_ss_size; + err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack)); + + err |= compat_setup_sigframe(&frame->sig, regs, set); + if (err == 0) + err = compat_setup_return(regs, ka, frame->sig.retcode, frame, + usig); + + if (err == 0) { + regs->regs[1] = (compat_ulong_t)(unsigned long)&frame->info; + regs->regs[2] = (compat_ulong_t)(unsigned long)&frame->sig.uc; + } + + return err; +} + +int compat_setup_frame(int usig, struct k_sigaction *ka, sigset_t *set, + struct pt_regs *regs) +{ + struct compat_sigframe __user *frame; + int err = 0; + + frame = compat_get_sigframe(ka, regs, sizeof(*frame)); + + if (!frame) + return 1; + + __put_user_error(0x5ac3c35a, &frame->uc.uc_flags, err); + + err |= compat_setup_sigframe(frame, regs, set); + if (err == 0) + err = compat_setup_return(regs, ka, frame->retcode, frame, usig); + + return err; +} + +/* + * RT signals don't have generic compat wrappers. + * See arch/powerpc/kernel/signal_32.c + */ +asmlinkage int compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set, + compat_sigset_t __user *oset, + compat_size_t sigsetsize) +{ + sigset_t s; + sigset_t __user *up; + int ret; + mm_segment_t old_fs = get_fs(); + + if (set) { + if (get_sigset_t(&s, set)) + return -EFAULT; + } + + set_fs(KERNEL_DS); + /* This is valid because of the set_fs() */ + up = (sigset_t __user *) &s; + ret = sys_rt_sigprocmask(how, set ? up : NULL, oset ? up : NULL, + sigsetsize); + set_fs(old_fs); + if (ret) + return ret; + if (oset) { + if (put_sigset_t(oset, &s)) + return -EFAULT; + } + return 0; +} + +asmlinkage int compat_sys_rt_sigpending(compat_sigset_t __user *set, + compat_size_t sigsetsize) +{ + sigset_t s; + int ret; + mm_segment_t old_fs = get_fs(); + + set_fs(KERNEL_DS); + /* The __user pointer cast is valid because of the set_fs() */ + ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize); + set_fs(old_fs); + if (!ret) { + if (put_sigset_t(set, &s)) + return -EFAULT; + } + return ret; +} + +asmlinkage int compat_sys_rt_sigqueueinfo(int pid, int sig, + compat_siginfo_t __user *uinfo) +{ + siginfo_t info; + int ret; + mm_segment_t old_fs = get_fs(); + + ret = copy_siginfo_from_user32(&info, uinfo); + if (unlikely(ret)) + return ret; + + set_fs (KERNEL_DS); + /* The __user pointer cast is valid because of the set_fs() */ + ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *) &info); + set_fs (old_fs); + return ret; +} + +void compat_setup_restart_syscall(struct pt_regs *regs) +{ + regs->regs[7] = __NR_restart_syscall; +} diff --git a/arch/arm64/kernel/sys32.S b/arch/arm64/kernel/sys32.S new file mode 100644 index 000000000000..5e4dc93cc31f --- /dev/null +++ b/arch/arm64/kernel/sys32.S @@ -0,0 +1,282 @@ +/* + * Compat system call wrappers + * + * Copyright (C) 2012 ARM Ltd. + * Authors: Will Deacon + * Catalin Marinas + * + * 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 . + */ + +#include + +#include +#include + +/* + * System call wrappers for the AArch32 compatibility layer. + */ +compat_sys_fork_wrapper: + mov x0, sp + b compat_sys_fork +ENDPROC(compat_sys_fork_wrapper) + +compat_sys_vfork_wrapper: + mov x0, sp + b compat_sys_vfork +ENDPROC(compat_sys_vfork_wrapper) + +compat_sys_execve_wrapper: + mov x3, sp + b compat_sys_execve +ENDPROC(compat_sys_execve_wrapper) + +compat_sys_clone_wrapper: + mov x5, sp + b compat_sys_clone +ENDPROC(compat_sys_clone_wrapper) + +compat_sys_sigreturn_wrapper: + mov x0, sp + mov x27, #0 // prevent syscall restart handling (why) + b compat_sys_sigreturn +ENDPROC(compat_sys_sigreturn_wrapper) + +compat_sys_rt_sigreturn_wrapper: + mov x0, sp + mov x27, #0 // prevent syscall restart handling (why) + b compat_sys_rt_sigreturn +ENDPROC(compat_sys_rt_sigreturn_wrapper) + +compat_sys_sigaltstack_wrapper: + ldr x2, [sp, #S_COMPAT_SP] + b compat_do_sigaltstack +ENDPROC(compat_sys_sigaltstack_wrapper) + +compat_sys_statfs64_wrapper: + mov w3, #84 + cmp w1, #88 + csel w1, w3, w1, eq + b compat_sys_statfs64 +ENDPROC(compat_sys_statfs64_wrapper) + +compat_sys_fstatfs64_wrapper: + mov w3, #84 + cmp w1, #88 + csel w1, w3, w1, eq + b compat_sys_fstatfs64 +ENDPROC(compat_sys_fstatfs64_wrapper) + +/* + * Wrappers for AArch32 syscalls that either take 64-bit parameters + * in registers or that take 32-bit parameters which require sign + * extension. + */ +compat_sys_lseek_wrapper: + sxtw x1, w1 + b sys_lseek +ENDPROC(compat_sys_lseek_wrapper) + +compat_sys_pread64_wrapper: + orr x3, x4, x5, lsl #32 + b sys_pread64 +ENDPROC(compat_sys_pread64_wrapper) + +compat_sys_pwrite64_wrapper: + orr x3, x4, x5, lsl #32 + b sys_pwrite64 +ENDPROC(compat_sys_pwrite64_wrapper) + +compat_sys_truncate64_wrapper: + orr x1, x2, x3, lsl #32 + b sys_truncate +ENDPROC(compat_sys_truncate64_wrapper) + +compat_sys_ftruncate64_wrapper: + orr x1, x2, x3, lsl #32 + b sys_ftruncate +ENDPROC(compat_sys_ftruncate64_wrapper) + +compat_sys_readahead_wrapper: + orr x1, x2, x3, lsl #32 + mov w2, w4 + b sys_readahead +ENDPROC(compat_sys_readahead_wrapper) + +compat_sys_lookup_dcookie: + orr x0, x0, x1, lsl #32 + mov w1, w2 + mov w2, w3 + b sys_lookup_dcookie +ENDPROC(compat_sys_lookup_dcookie) + +compat_sys_fadvise64_64_wrapper: + mov w6, w1 + orr x1, x2, x3, lsl #32 + orr x2, x4, x5, lsl #32 + mov w3, w6 + b sys_fadvise64_64 +ENDPROC(compat_sys_fadvise64_64_wrapper) + +compat_sys_sync_file_range2_wrapper: + orr x2, x2, x3, lsl #32 + orr x3, x4, x5, lsl #32 + b sys_sync_file_range2 +ENDPROC(compat_sys_sync_file_range2_wrapper) + +compat_sys_fallocate_wrapper: + orr x2, x2, x3, lsl #32 + orr x3, x4, x5, lsl #32 + b sys_fallocate +ENDPROC(compat_sys_fallocate_wrapper) + +compat_sys_fanotify_mark_wrapper: + orr x2, x2, x3, lsl #32 + mov w3, w4 + mov w4, w5 + b sys_fanotify_mark +ENDPROC(compat_sys_fanotify_mark_wrapper) + +/* + * Use the compat system call wrappers. + */ +#define sys_fork compat_sys_fork_wrapper +#define sys_open compat_sys_open +#define sys_execve compat_sys_execve_wrapper +#define sys_lseek compat_sys_lseek_wrapper +#define sys_mount compat_sys_mount +#define sys_ptrace compat_sys_ptrace +#define sys_times compat_sys_times +#define sys_ioctl compat_sys_ioctl +#define sys_fcntl compat_sys_fcntl +#define sys_ustat compat_sys_ustat +#define sys_sigaction compat_sys_sigaction +#define sys_sigsuspend compat_sys_sigsuspend +#define sys_sigpending compat_sys_sigpending +#define sys_setrlimit compat_sys_setrlimit +#define sys_getrusage compat_sys_getrusage +#define sys_gettimeofday compat_sys_gettimeofday +#define sys_settimeofday compat_sys_settimeofday +#define sys_statfs compat_sys_statfs +#define sys_fstatfs compat_sys_fstatfs +#define sys_setitimer compat_sys_setitimer +#define sys_getitimer compat_sys_getitimer +#define sys_newstat compat_sys_newstat +#define sys_newlstat compat_sys_newlstat +#define sys_newfstat compat_sys_newfstat +#define sys_wait4 compat_sys_wait4 +#define sys_sysinfo compat_sys_sysinfo +#define sys_sigreturn compat_sys_sigreturn_wrapper +#define sys_clone compat_sys_clone_wrapper +#define sys_adjtimex compat_sys_adjtimex +#define sys_sigprocmask compat_sys_sigprocmask +#define sys_getdents compat_sys_getdents +#define sys_select compat_sys_select +#define sys_readv compat_sys_readv +#define sys_writev compat_sys_writev +#define sys_sysctl compat_sys_sysctl +#define sys_sched_rr_get_interval compat_sys_sched_rr_get_interval +#define sys_nanosleep compat_sys_nanosleep +#define sys_rt_sigreturn compat_sys_rt_sigreturn_wrapper +#define sys_rt_sigaction compat_sys_rt_sigaction +#define sys_rt_sigprocmask compat_sys_rt_sigprocmask +#define sys_rt_sigpending compat_sys_rt_sigpending +#define sys_rt_sigtimedwait compat_sys_rt_sigtimedwait +#define sys_rt_sigqueueinfo compat_sys_rt_sigqueueinfo +#define sys_rt_sigsuspend compat_sys_rt_sigsuspend +#define sys_pread64 compat_sys_pread64_wrapper +#define sys_pwrite64 compat_sys_pwrite64_wrapper +#define sys_sigaltstack compat_sys_sigaltstack_wrapper +#define sys_sendfile compat_sys_sendfile +#define sys_vfork compat_sys_vfork_wrapper +#define sys_getrlimit compat_sys_getrlimit +#define sys_mmap2 sys_mmap_pgoff +#define sys_truncate64 compat_sys_truncate64_wrapper +#define sys_ftruncate64 compat_sys_ftruncate64_wrapper +#define sys_getdents64 compat_sys_getdents64 +#define sys_fcntl64 compat_sys_fcntl64 +#define sys_readahead compat_sys_readahead_wrapper +#define sys_futex compat_sys_futex +#define sys_sched_setaffinity compat_sys_sched_setaffinity +#define sys_sched_getaffinity compat_sys_sched_getaffinity +#define sys_io_setup compat_sys_io_setup +#define sys_io_getevents compat_sys_io_getevents +#define sys_io_submit compat_sys_io_submit +#define sys_lookup_dcookie compat_sys_lookup_dcookie +#define sys_timer_create compat_sys_timer_create +#define sys_timer_settime compat_sys_timer_settime +#define sys_timer_gettime compat_sys_timer_gettime +#define sys_clock_settime compat_sys_clock_settime +#define sys_clock_gettime compat_sys_clock_gettime +#define sys_clock_getres compat_sys_clock_getres +#define sys_clock_nanosleep compat_sys_clock_nanosleep +#define sys_statfs64 compat_sys_statfs64_wrapper +#define sys_fstatfs64 compat_sys_fstatfs64_wrapper +#define sys_utimes compat_sys_utimes +#define sys_fadvise64_64 compat_sys_fadvise64_64_wrapper +#define sys_mq_open compat_sys_mq_open +#define sys_mq_timedsend compat_sys_mq_timedsend +#define sys_mq_timedreceive compat_sys_mq_timedreceive +#define sys_mq_notify compat_sys_mq_notify +#define sys_mq_getsetattr compat_sys_mq_getsetattr +#define sys_waitid compat_sys_waitid +#define sys_recv compat_sys_recv +#define sys_recvfrom compat_sys_recvfrom +#define sys_setsockopt compat_sys_setsockopt +#define sys_getsockopt compat_sys_getsockopt +#define sys_sendmsg compat_sys_sendmsg +#define sys_recvmsg compat_sys_recvmsg +#define sys_semctl compat_sys_semctl +#define sys_msgsnd compat_sys_msgsnd +#define sys_msgrcv compat_sys_msgrcv +#define sys_msgctl compat_sys_msgctl +#define sys_shmat compat_sys_shmat +#define sys_shmctl compat_sys_shmctl +#define sys_keyctl compat_sys_keyctl +#define sys_semtimedop compat_sys_semtimedop +#define sys_mbind compat_sys_mbind +#define sys_get_mempolicy compat_sys_get_mempolicy +#define sys_set_mempolicy compat_sys_set_mempolicy +#define sys_openat compat_sys_openat +#define sys_futimesat compat_sys_futimesat +#define sys_pselect6 compat_sys_pselect6 +#define sys_ppoll compat_sys_ppoll +#define sys_set_robust_list compat_sys_set_robust_list +#define sys_get_robust_list compat_sys_get_robust_list +#define sys_sync_file_range2 compat_sys_sync_file_range2_wrapper +#define sys_vmsplice compat_sys_vmsplice +#define sys_move_pages compat_sys_move_pages +#define sys_epoll_pwait compat_sys_epoll_pwait +#define sys_kexec_load compat_sys_kexec_load +#define sys_utimensat compat_sys_utimensat +#define sys_signalfd compat_sys_signalfd +#define sys_fallocate compat_sys_fallocate_wrapper +#define sys_timerfd_settime compat_sys_timerfd_settime +#define sys_timerfd_gettime compat_sys_timerfd_gettime +#define sys_signalfd4 compat_sys_signalfd4 +#define sys_preadv compat_sys_preadv +#define sys_pwritev compat_sys_pwritev +#define sys_rt_tgsigqueueinfo compat_sys_rt_tgsigqueueinfo +#define sys_recvmmsg compat_sys_recvmmsg +#define sys_fanotify_mark compat_sys_fanotify_mark_wrapper + +#undef __SYSCALL +#define __SYSCALL(x, y) .quad y // x +#define __SYSCALL_COMPAT + +/* + * The system calls table must be 4KB aligned. + */ + .align 12 +ENTRY(compat_sys_call_table) +#include diff --git a/arch/arm64/kernel/sys_compat.c b/arch/arm64/kernel/sys_compat.c new file mode 100644 index 000000000000..967e92fdff01 --- /dev/null +++ b/arch/arm64/kernel/sys_compat.c @@ -0,0 +1,164 @@ +/* + * Based on arch/arm/kernel/sys_arm.c + * + * Copyright (C) People who wrote linux/arch/i386/kernel/sys_i386.c + * Copyright (C) 1995, 1996 Russell King. + * Copyright (C) 2012 ARM Ltd. + * + * 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 . + */ + +#define __SYSCALL_COMPAT + +#include +#include +#include +#include +#include +#include + +#include +#include + +asmlinkage int compat_sys_fork(struct pt_regs *regs) +{ + return do_fork(SIGCHLD, regs->compat_sp, regs, 0, NULL, NULL); +} + +asmlinkage int compat_sys_clone(unsigned long clone_flags, unsigned long newsp, + int __user *parent_tidptr, int tls_val, + int __user *child_tidptr, struct pt_regs *regs) +{ + if (!newsp) + newsp = regs->compat_sp; + + return do_fork(clone_flags, newsp, regs, 0, parent_tidptr, child_tidptr); +} + +asmlinkage int compat_sys_vfork(struct pt_regs *regs) +{ + return do_fork(CLONE_VFORK | CLONE_VM | SIGCHLD, regs->compat_sp, + regs, 0, NULL, NULL); +} + +asmlinkage int compat_sys_execve(const char __user *filenamei, + compat_uptr_t argv, compat_uptr_t envp, + struct pt_regs *regs) +{ + int error; + char * filename; + + filename = getname(filenamei); + error = PTR_ERR(filename); + if (IS_ERR(filename)) + goto out; + error = compat_do_execve(filename, compat_ptr(argv), compat_ptr(envp), + regs); + putname(filename); +out: + return error; +} + +asmlinkage int compat_sys_sched_rr_get_interval(compat_pid_t pid, + struct compat_timespec __user *interval) +{ + struct timespec t; + int ret; + mm_segment_t old_fs = get_fs(); + + set_fs(KERNEL_DS); + ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t); + set_fs(old_fs); + if (put_compat_timespec(&t, interval)) + return -EFAULT; + return ret; +} + +asmlinkage int compat_sys_sendfile(int out_fd, int in_fd, + compat_off_t __user *offset, s32 count) +{ + mm_segment_t old_fs = get_fs(); + int ret; + off_t of; + + if (offset && get_user(of, offset)) + return -EFAULT; + + set_fs(KERNEL_DS); + ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL, + count); + set_fs(old_fs); + + if (offset && put_user(of, offset)) + return -EFAULT; + return ret; +} + +static inline void +do_compat_cache_op(unsigned long start, unsigned long end, int flags) +{ + struct mm_struct *mm = current->active_mm; + struct vm_area_struct *vma; + + if (end < start || flags) + return; + + down_read(&mm->mmap_sem); + vma = find_vma(mm, start); + if (vma && vma->vm_start < end) { + if (start < vma->vm_start) + start = vma->vm_start; + if (end > vma->vm_end) + end = vma->vm_end; + up_read(&mm->mmap_sem); + __flush_cache_user_range(start & PAGE_MASK, PAGE_ALIGN(end)); + return; + } + up_read(&mm->mmap_sem); +} + +/* + * Handle all unrecognised system calls. + */ +long compat_arm_syscall(struct pt_regs *regs) +{ + unsigned int no = regs->regs[7]; + + switch (no) { + /* + * Flush a region from virtual address 'r0' to virtual address 'r1' + * _exclusive_. There is no alignment requirement on either address; + * user space does not need to know the hardware cache layout. + * + * r2 contains flags. It should ALWAYS be passed as ZERO until it + * is defined to be something else. For now we ignore it, but may + * the fires of hell burn in your belly if you break this rule. ;) + * + * (at a later date, we may want to allow this call to not flush + * various aspects of the cache. Passing '0' will guarantee that + * everything necessary gets flushed to maintain consistency in + * the specified region). + */ + case __ARM_NR_compat_cacheflush: + do_compat_cache_op(regs->regs[0], regs->regs[1], regs->regs[2]); + return 0; + + case __ARM_NR_compat_set_tls: + current->thread.tp_value = regs->regs[0]; + asm ("msr tpidrro_el0, %0" : : "r" (regs->regs[0])); + return 0; + + default: + return -ENOSYS; + } +} -- cgit v1.2.2