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5b813f1a2a
Prior to this change we would assume the ABI for Apple targets to be GNU which could result in subtle errors in LLVM emitting calls to non-existent system libc provided functions such as `_sincosf` which is a GNU extension and as such is not provided by macOS for example. This would result in linker errors where the linker would not be able to find the said symbol in `libSystem.tbd`. With this change, we now correctly identify macOS (and other Apple platforms) as having ABI `unknown` which translates to unspecified in LLVM under-the-hood: ``` // main.ll target triple = "aarch64-unknown-macos-unknown" ``` Note however that we never suffix the target OS with target version such as `macos11` or `macos12` which means we fail to instruct LLVM of potential optimisations provided by the OS such as the availability of function `___sincosf_stret`. I suggest we investigate that in a follow-up commit.
152 lines
5.2 KiB
C
Vendored
152 lines
5.2 KiB
C
Vendored
/*
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* Copyright (c) 2000-2002 Apple Computer, Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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/*
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* @OSF_COPYRIGHT@
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*/
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/*
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* Mach Operating System
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* Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*/
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/*
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*/
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/*
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* File: mach/vm_prot.h
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* Author: Avadis Tevanian, Jr., Michael Wayne Young
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*
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* Virtual memory protection definitions.
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*
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*/
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#ifndef _MACH_VM_PROT_H_
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#define _MACH_VM_PROT_H_
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/*
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* Types defined:
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*
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* vm_prot_t VM protection values.
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*/
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typedef int vm_prot_t;
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/*
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* Protection values, defined as bits within the vm_prot_t type
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*/
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#define VM_PROT_NONE ((vm_prot_t) 0x00)
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#define VM_PROT_READ ((vm_prot_t) 0x01) /* read permission */
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#define VM_PROT_WRITE ((vm_prot_t) 0x02) /* write permission */
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#define VM_PROT_EXECUTE ((vm_prot_t) 0x04) /* execute permission */
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/*
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* The default protection for newly-created virtual memory
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*/
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#define VM_PROT_DEFAULT (VM_PROT_READ|VM_PROT_WRITE)
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/*
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* The maximum privileges possible, for parameter checking.
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*/
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#define VM_PROT_ALL (VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE)
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/*
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* An invalid protection value.
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* Used only by memory_object_lock_request to indicate no change
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* to page locks. Using -1 here is a bad idea because it
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* looks like VM_PROT_ALL and then some.
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*/
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#define VM_PROT_NO_CHANGE ((vm_prot_t) 0x08)
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/*
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* When a caller finds that he cannot obtain write permission on a
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* mapped entry, the following flag can be used. The entry will
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* be made "needs copy" effectively copying the object (using COW),
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* and write permission will be added to the maximum protections
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* for the associated entry.
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*/
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#define VM_PROT_COPY ((vm_prot_t) 0x10)
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/*
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* Another invalid protection value.
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* Used only by memory_object_data_request upon an object
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* which has specified a copy_call copy strategy. It is used
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* when the kernel wants a page belonging to a copy of the
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* object, and is only asking the object as a result of
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* following a shadow chain. This solves the race between pages
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* being pushed up by the memory manager and the kernel
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* walking down the shadow chain.
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*/
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#define VM_PROT_WANTS_COPY ((vm_prot_t) 0x10)
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/*
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* Another invalid protection value.
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* Indicates that the other protection bits are to be applied as a mask
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* against the actual protection bits of the map entry.
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*/
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#define VM_PROT_IS_MASK ((vm_prot_t) 0x40)
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/*
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* Another invalid protection value to support execute-only protection.
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* VM_PROT_STRIP_READ is a special marker that tells mprotect to not
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* set VM_PROT_READ. We have to do it this way because existing code
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* expects the system to set VM_PROT_READ if VM_PROT_EXECUTE is set.
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* VM_PROT_EXECUTE_ONLY is just a convenience value to indicate that
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* the memory should be executable and explicitly not readable. It will
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* be ignored on platforms that do not support this type of protection.
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*/
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#define VM_PROT_STRIP_READ ((vm_prot_t) 0x80)
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#define VM_PROT_EXECUTE_ONLY (VM_PROT_EXECUTE|VM_PROT_STRIP_READ)
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#endif /* _MACH_VM_PROT_H_ */ |