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genode/repos/base/include/spec/arm/cpu/consts.h

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base: Fix stack pointer alignment for ARM After some research we found that the stack pointer on ARM platforms must be at least double word aligned (See: "Procedure Call Standard for the ARM Architecture" - 5.2.1.1). Since a 'call' on ARM will not result in a stack pointer change (like on x86), the current behavior resulted in a 4 Byte aligned stack only. Follow up to #1043
2014-02-20 10:27:26 +00:00
/*
* \brief Constants definitions for the ARM architecture.
* \author Sebastian Sumpf
* \date 2014-02-20
*/
/*
Adjust file headers to refer to the AGPLv3
2017-02-20 12:23:52 +00:00
* Copyright (C) 2011-2017 Genode Labs GmbH
base: Fix stack pointer alignment for ARM After some research we found that the stack pointer on ARM platforms must be at least double word aligned (See: "Procedure Call Standard for the ARM Architecture" - 5.2.1.1). Since a 'call' on ARM will not result in a stack pointer change (like on x86), the current behavior resulted in a 4 Byte aligned stack only. Follow up to #1043
2014-02-20 10:27:26 +00:00
*
* This file is part of the Genode OS framework, which is distributed
Adjust file headers to refer to the AGPLv3
2017-02-20 12:23:52 +00:00
* under the terms of the GNU Affero General Public License version 3.
base: Fix stack pointer alignment for ARM After some research we found that the stack pointer on ARM platforms must be at least double word aligned (See: "Procedure Call Standard for the ARM Architecture" - 5.2.1.1). Since a 'call' on ARM will not result in a stack pointer change (like on x86), the current behavior resulted in a 4 Byte aligned stack only. Follow up to #1043
2014-02-20 10:27:26 +00:00
*/
Introduce 'spec' subdirectories to outline aspects Instead of holding SPEC-variable dependent files and directories inline within the repository structure, move them into 'spec' subdirectories at the corresponding levels, e.g.: repos/base/include/spec repos/base/mk/spec repos/base/lib/mk/spec repos/base/src/core/spec ... Moreover, this commit removes the 'platform' directories. That term was used in an overloaded sense. All SPEC-relative 'platform' directories are now named 'spec'. Other files, like for instance those related to the kernel/architecture specific startup library, where moved from 'platform' directories to explicit, more meaningful places like e.g.: 'src/lib/startup'. Fix #1673
2015-09-03 12:55:05 +00:00
#ifndef _INCLUDE__SPEC__ARM__CPU__CONSTS_H_
#define _INCLUDE__SPEC__ARM__CPU__CONSTS_H_
base: Fix stack pointer alignment for ARM After some research we found that the stack pointer on ARM platforms must be at least double word aligned (See: "Procedure Call Standard for the ARM Architecture" - 5.2.1.1). Since a 'call' on ARM will not result in a stack pointer change (like on x86), the current behavior resulted in a 4 Byte aligned stack only. Follow up to #1043
2014-02-20 10:27:26 +00:00
#include <base/stdint.h>
namespace Abi {
base: ABI specific stack creation ref #1042
2014-02-21 09:59:39 +00:00
noux: consider stack alignment constraints The interim stack in a forked noux process has to consider the architecture dependent stack alignment constraints. Fix #1852
2016-01-15 14:48:20 +00:00
/*
* On ARM we align the stack top to 16-byte. As a call (or branch) will not
* change the stack pointer, we need no further stack adjustment.
base: Fix stack pointer alignment for ARM After some research we found that the stack pointer on ARM platforms must be at least double word aligned (See: "Procedure Call Standard for the ARM Architecture" - 5.2.1.1). Since a 'call' on ARM will not result in a stack pointer change (like on x86), the current behavior resulted in a 4 Byte aligned stack only. Follow up to #1043
2014-02-20 10:27:26 +00:00
*/
Prevent compiler warnings
2016-04-21 07:10:44 +00:00
inline Genode::addr_t stack_align(Genode::addr_t addr) {
Fix some signed/unsigned implicit conversions. Fix some trivial cases where the signedness of the constant value does not match the signedness of type the code expects to see. GCC can be asked to warn about those by passing Wsign-covnersion flag. Issue #4354
2021-12-18 21:49:54 +00:00
return (addr & ~0xfUL); }
base: ABI specific stack creation ref #1042
2014-02-21 09:59:39 +00:00
/**
* Do ABI specific initialization to a freshly created stack
*/
inline void init_stack(Genode::addr_t) { }
base: Fix stack pointer alignment for ARM After some research we found that the stack pointer on ARM platforms must be at least double word aligned (See: "Procedure Call Standard for the ARM Architecture" - 5.2.1.1). Since a 'call' on ARM will not result in a stack pointer change (like on x86), the current behavior resulted in a 4 Byte aligned stack only. Follow up to #1043
2014-02-20 10:27:26 +00:00
}
Introduce 'spec' subdirectories to outline aspects Instead of holding SPEC-variable dependent files and directories inline within the repository structure, move them into 'spec' subdirectories at the corresponding levels, e.g.: repos/base/include/spec repos/base/mk/spec repos/base/lib/mk/spec repos/base/src/core/spec ... Moreover, this commit removes the 'platform' directories. That term was used in an overloaded sense. All SPEC-relative 'platform' directories are now named 'spec'. Other files, like for instance those related to the kernel/architecture specific startup library, where moved from 'platform' directories to explicit, more meaningful places like e.g.: 'src/lib/startup'. Fix #1673
2015-09-03 12:55:05 +00:00
#endif /* _INCLUDE__SPEC__ARM__CPU__CONSTS_H_ */
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