X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/d7e50217d7adf6e52786a38bcaa4cd698cb9a79e..3e170ce000f1506b7b5d2c5c7faec85ceabb573d:/osfmk/kern/syscall_emulation.c diff --git a/osfmk/kern/syscall_emulation.c b/osfmk/kern/syscall_emulation.c index 308e3ef7c..c067cb0db 100644 --- a/osfmk/kern/syscall_emulation.c +++ b/osfmk/kern/syscall_emulation.c @@ -1,16 +1,19 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2005 Apple Computer, Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ - * - * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in - * compliance with the License. Please obtain a copy of the License at - * http://www.opensource.apple.com/apsl/ and read it before using this - * file. + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. + * + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER @@ -20,7 +23,7 @@ * Please see the License for the specific language governing rights and * limitations under the License. * - * @APPLE_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * @OSF_COPYRIGHT@ @@ -52,286 +55,24 @@ */ /* */ - +#include #include #include #include +#include + +#include #include -#include #include #include + +#include #include -#include /* for syscall_emulation_sync */ /* * Exported interface */ -/* - * WARNING: - * This code knows that kalloc() allocates memory most efficiently - * in sizes that are powers of 2, and asks for those sizes. - */ - -/* - * Go from number of entries to size of struct eml_dispatch and back. - */ -#define base_size (sizeof(struct eml_dispatch) - sizeof(eml_routine_t)) -#define count_to_size(count) \ - (base_size + sizeof(vm_offset_t) * (count)) - -#define size_to_count(size) \ - ( ((size) - base_size) / sizeof(vm_offset_t) ) - -/* Forwards */ -kern_return_t -task_set_emulation_vector_internal( - task_t task, - int vector_start, - emulation_vector_t emulation_vector, - mach_msg_type_number_t emulation_vector_count); - -/* - * eml_init: initialize user space emulation code - */ -void -eml_init(void) -{ -} - -/* - * eml_task_reference() [Exported] - * - * Bumps the reference count on the common emulation - * vector. - */ - -void -eml_task_reference( - task_t task, - task_t parent) -{ - register eml_dispatch_t eml; - - if (parent == TASK_NULL) - eml = EML_DISPATCH_NULL; - else - eml = parent->eml_dispatch; - - if (eml != EML_DISPATCH_NULL) { - mutex_lock(&eml->lock); - eml->ref_count++; - mutex_unlock(&eml->lock); - } - task->eml_dispatch = eml; -} - - -/* - * eml_task_deallocate() [Exported] - * - * Cleans up after the emulation code when a process exits. - */ - -void -eml_task_deallocate( - task_t task) -{ - register eml_dispatch_t eml; - - eml = task->eml_dispatch; - if (eml != EML_DISPATCH_NULL) { - int count; - - mutex_lock(&eml->lock); - count = --eml->ref_count; - mutex_unlock(&eml->lock); - - if (count == 0) - kfree((vm_offset_t)eml, count_to_size(eml->disp_count)); - - task->eml_dispatch = EML_DISPATCH_NULL; - } -} - -/* - * task_set_emulation_vector: [Server Entry] - * set a list of emulated system calls for this task. - */ -kern_return_t -task_set_emulation_vector_internal( - task_t task, - int vector_start, - emulation_vector_t emulation_vector, - mach_msg_type_number_t emulation_vector_count) -{ - eml_dispatch_t cur_eml, new_eml, old_eml; - vm_size_t new_size; - int cur_start, cur_end; - int new_start, new_end; - int vector_end; - - if (task == TASK_NULL) - return EML_BAD_TASK; - - vector_end = vector_start + (int) emulation_vector_count; - - /* - * We try to re-use the existing emulation vetor - * if possible. We can reuse the vector if it - * is not shared with another task and if it is - * large enough to contain the entries we are - * supplying. - * - * We must grab the lock on the task to check whether - * there is an emulation vector. - * If the vector is shared or not large enough, we - * need to drop the lock and allocate a new emulation - * vector. - * - * While the lock is dropped, the emulation vector - * may be released by all other tasks (giving us - * exclusive use), or may be enlarged by another - * task_set_emulation_vector call. Therefore, - * after allocating the new emulation vector, we - * must grab the lock again to check whether we - * really need the new vector we just allocated. - * - * Since an emulation vector cannot be altered - * if it is in use by more than one task, the - * task lock is sufficient to protect the vector`s - * start, count, and contents. The lock in the - * vector protects only the reference count. - */ - - old_eml = EML_DISPATCH_NULL; /* vector to discard */ - new_eml = EML_DISPATCH_NULL; /* new vector */ - - for (;;) { - /* - * Find the current emulation vector. - * See whether we can overwrite it. - */ - task_lock(task); - cur_eml = task->eml_dispatch; - if (cur_eml != EML_DISPATCH_NULL) { - cur_start = cur_eml->disp_min; - cur_end = cur_eml->disp_count + cur_start; - - mutex_lock(&cur_eml->lock); - if (cur_eml->ref_count == 1 && - cur_start <= vector_start && - cur_end >= vector_end) - { - /* - * Can use the existing emulation vector. - * Discard any new one we allocated. - */ - mutex_unlock(&cur_eml->lock); - old_eml = new_eml; - break; - } - - if (new_eml != EML_DISPATCH_NULL && - new_start <= cur_start && - new_end >= cur_end) - { - /* - * A new vector was allocated, and it is large enough - * to hold all the entries from the current vector. - * Copy the entries to the new emulation vector, - * deallocate the current one, and use the new one. - */ - - bcopy((char *)&cur_eml->disp_vector[0], - (char *)&new_eml->disp_vector[cur_start-new_start], - cur_eml->disp_count * sizeof(vm_offset_t)); - - - if (--cur_eml->ref_count == 0) - old_eml = cur_eml; /* discard old vector */ - mutex_unlock(&cur_eml->lock); - - task->eml_dispatch = new_eml; - syscall_emulation_sync(task); - cur_eml = new_eml; - break; - } - mutex_unlock(&cur_eml->lock); - - /* - * Need a new emulation vector. - * Ensure it will hold all the entries from - * both the old and new emulation vectors. - */ - new_start = vector_start; - if (new_start > cur_start) - new_start = cur_start; - new_end = vector_end; - if (new_end < cur_end) - new_end = cur_end; - } - else { - /* - * There is no curren emulation vector. - * If a new one was allocated, use it. - */ - if (new_eml != EML_DISPATCH_NULL) { - task->eml_dispatch = new_eml; - cur_eml = new_eml; - break; - } - - /* - * Compute the size needed for the new vector. - */ - new_start = vector_start; - new_end = vector_end; - } - - /* - * Have no vector (or one that is no longer large enough). - * Drop all the locks and allocate a new vector. - * Repeat the loop to check whether the old vector was - * changed while we didn`t hold the locks. - */ - - task_unlock(task); - - if (new_eml != EML_DISPATCH_NULL) - kfree((vm_offset_t)new_eml, count_to_size(new_eml->disp_count)); - - new_size = count_to_size(new_end - new_start); - new_eml = (eml_dispatch_t) kalloc(new_size); - - bzero((char *)new_eml, new_size); - mutex_init(&new_eml->lock, ETAP_MISC_EMULATE); - new_eml->ref_count = 1; - new_eml->disp_min = new_start; - new_eml->disp_count = new_end - new_start; - - continue; - } - - /* - * We have the emulation vector. - * Install the new emulation entries. - */ - bcopy((char *)&emulation_vector[0], - (char *)&cur_eml->disp_vector[vector_start - cur_eml->disp_min], - emulation_vector_count * sizeof(vm_offset_t)); - - task_unlock(task); - - /* - * Discard any old emulation vector we don`t need. - */ - if (old_eml) - kfree((vm_offset_t) old_eml, count_to_size(old_eml->disp_count)); - - return KERN_SUCCESS; -} - /* * task_set_emulation_vector: [Server Entry] * @@ -340,68 +81,12 @@ task_set_emulation_vector_internal( */ kern_return_t task_set_emulation_vector( - task_t task, - int vector_start, - emulation_vector_t emulation_vector, - mach_msg_type_number_t emulation_vector_count) + __unused task_t task, + __unused int vector_start, + __unused emulation_vector_t emulation_vector, + __unused mach_msg_type_number_t emulation_vector_count) { - kern_return_t kr; - vm_offset_t emul_vector_addr; - - if (task == TASK_NULL) - return EML_BAD_TASK; /* XXX sb KERN_INVALID_ARGUMENT */ - - /* - * XXX - barbou@gr.osf.org. - * If emulation_vector_count is NULL, discard the emulation - * vectors. - * We need a way to do that for emulator-less servers started - * from a classic server. There seems to be no way to get rid - * of or to avoid inheriting the emulation vector !? - */ - if (emulation_vector_count == 0) { - eml_task_deallocate(task); - return KERN_SUCCESS; - } - - - /* - * The emulation vector is really a vm_map_copy_t. - */ - kr = vm_map_copyout(ipc_kernel_map, &emul_vector_addr, - (vm_map_copy_t) emulation_vector); - if (kr != KERN_SUCCESS) - return kr; - - /* - * Can't fault while we hold locks. - */ - kr = vm_map_wire(ipc_kernel_map, - trunc_page_32(emul_vector_addr), - round_page_32(emul_vector_addr + - emulation_vector_count * - sizeof(eml_dispatch_t)), - VM_PROT_READ|VM_PROT_WRITE, FALSE); - assert(kr == KERN_SUCCESS); - - /* - * Do the work. - */ - kr = task_set_emulation_vector_internal( - task, - vector_start, - (emulation_vector_t) emul_vector_addr, - emulation_vector_count); - assert(kr == KERN_SUCCESS); - - /* - * Discard the memory - */ - (void) kmem_free(ipc_kernel_map, - emul_vector_addr, - emulation_vector_count * sizeof(eml_dispatch_t)); - - return KERN_SUCCESS; + return KERN_NOT_SUPPORTED; } /* @@ -412,102 +97,12 @@ task_set_emulation_vector( */ kern_return_t task_get_emulation_vector( - task_t task, - int *vector_start, /* out */ - emulation_vector_t *emulation_vector, /* out */ - mach_msg_type_number_t *emulation_vector_count) /* out */ + __unused task_t task, + __unused int *vector_start, /* out */ + __unused emulation_vector_t *emulation_vector, /* out */ + __unused mach_msg_type_number_t *emulation_vector_count)/* out */ { - eml_dispatch_t eml; - vm_size_t vector_size, size; - vm_offset_t addr; - - if (task == TASK_NULL) - return EML_BAD_TASK; - - addr = 0; - size = 0; - - for(;;) { - vm_size_t size_needed; - - task_lock(task); - eml = task->eml_dispatch; - if (eml == EML_DISPATCH_NULL) { - task_unlock(task); - if (addr) - (void) kmem_free(ipc_kernel_map, addr, size); - *vector_start = 0; - *emulation_vector = 0; - *emulation_vector_count = 0; - return KERN_SUCCESS; - } - - /* - * Do we have the memory we need? - */ - vector_size = eml->disp_count * sizeof(vm_offset_t); - - size_needed = round_page_32(vector_size); - if (size_needed <= size) - break; - - /* - * If not, unlock the task and allocate more memory. - */ - task_unlock(task); - - if (size != 0) - kmem_free(ipc_kernel_map, addr, size); - - size = size_needed; - if (kmem_alloc(ipc_kernel_map, &addr, size) != KERN_SUCCESS) - return KERN_RESOURCE_SHORTAGE; - } - - /* - * Copy out the dispatch addresses - */ - *vector_start = eml->disp_min; - *emulation_vector_count = eml->disp_count; - bcopy((char *)eml->disp_vector, - (char *)addr, - vector_size); - - /* - * Unlock the task and free any memory we did not need - */ - task_unlock(task); - { - vm_size_t size_used, size_left; - vm_map_copy_t memory; - - /* - * Free any unused memory beyond the end of the last page used - */ - size_used = round_page_32(vector_size); - if (size_used != size) - (void) kmem_free(ipc_kernel_map, - addr + size_used, - size - size_used); - - /* - * Zero the remainder of the page being returned. - */ - size_left = size_used - vector_size; - if (size_left > 0) - bzero((char *)addr + vector_size, size_left); - - /* - * Unwire and make memory into copyin form. - */ - (void) vm_map_unwire(ipc_kernel_map, addr, addr + size_used, FALSE); - (void) vm_map_copyin(ipc_kernel_map, addr, vector_size, - TRUE, &memory); - - *emulation_vector = (emulation_vector_t) memory; - } - - return KERN_SUCCESS; + return KERN_NOT_SUPPORTED; } /* @@ -516,12 +111,11 @@ task_get_emulation_vector( */ kern_return_t task_set_emulation( - task_t task, - vm_offset_t routine_entry_pt, - int routine_number) + __unused task_t task, + __unused vm_offset_t routine_entry_pt, + __unused int routine_number) { - return task_set_emulation_vector_internal(task, routine_number, - &routine_entry_pt, 1); + return KERN_NOT_SUPPORTED; }