[apple/xnu.git] / osfmk / mach / arm / syscall_sw.h

/*
 * Copyright (c) 2007 Apple 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. 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
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*
 * FILE_ID: syscall_sw.h
 */

#ifndef	_MACH_ARM_SYSCALL_SW_H_
#define _MACH_ARM_SYSCALL_SW_H_

#if defined(__arm__)

#include <mach/machine/vm_param.h>
#include <architecture/arm/asm_help.h>

/* 0 to 4 args are already loaded in r0-r3 */
#define _kernel_trap_0to4(trap_name, trap_number) \
	mov		r12, # ## trap_number			/* load syscall number */ ; \
	swi		#SWI_SYSCALL					; \
	bx		lr								/* return */ ;

#define _kernel_trap_5(trap_name, trap_number) \
	mov		ip, sp							/* save pointer to args */ ; \
	stmfd	sp!, { r4-r5 }					/* save r4-r5, keep stack 64-bit aligned */; \
	ldr		r4, [ ip ]						/* load arg 5 */ ; \
	mov		r12, # ## trap_number			/* load syscall number */ ; \
	swi		#SWI_SYSCALL					; \
	ldmfd	sp!, { r4-r5 }					/* restore r4-r5 */ ;\
	bx		lr								/* return */ ;

#define _kernel_trap_6to9(trap_name, trap_number, save_regs, arg_regs) \
	mov		ip, sp							/* save pointer to args */ ; \
	stmfd	sp!, { save_regs }				/* callee saved regs */; \
	ldmia	ip, { arg_regs }				/* load arg registers (above r0-r3) */ ;\
	mov		r12, # ## trap_number			/* load syscall number */ ; \
	swi		#SWI_SYSCALL					; \
	ldmfd	sp!, { save_regs }	 			/* restore callee saved regs */ ;\
	bx		lr								/* return */ ;

#define COMMA ,

/* For the armv7k ABI, the alignment requirements may add padding. So we
 * let the kernel figure it out and push extra on the stack to avoid un-needed
 * copy-ins. We are relying on arguments that aren't in registers starting 
 * 32 bytes from sp.  */
#if __BIGGEST_ALIGNMENT__ > 4

#define _kernel_trap_0(trap_name, trap_number) _kernel_trap_0to4(trap_name, trap_number)
#define _kernel_trap_1(trap_name, trap_number) _kernel_trap_0to4(trap_name, trap_number)
#define _kernel_trap_2(trap_name, trap_number) _kernel_trap_0to4(trap_name, trap_number)
#define _kernel_trap_3(trap_name, trap_number) _kernel_trap_0to4(trap_name, trap_number)
#define _kernel_trap_4(trap_name, trap_number) _kernel_trap_6to9(trap_name, trap_number, r4-r5, r4-r5)
#undef _kernel_trap_5
#define _kernel_trap_5(trap_name, trap_number) _kernel_trap_6to9(trap_name, trap_number, r4-r5, r4-r5)
#define _kernel_trap_6(trap_name, trap_number) _kernel_trap_6to9(trap_name, trap_number, r4-r6 COMMA r8, r4-r6 COMMA r8)
#define _kernel_trap_7(trap_name, trap_number) _kernel_trap_6to9(trap_name, trap_number, r4-r6 COMMA r8, r4-r6 COMMA r8)
#define _kernel_trap_8(trap_name, trap_number) _kernel_trap_6to9(trap_name, trap_number, r4-r6 COMMA r8, r4-r6 COMMA r8)
#define _kernel_trap_9(trap_name, trap_number) _kernel_trap_6to9(trap_name, trap_number, r4-r6 COMMA r8, r4-r6 COMMA r8)
#else // !(__BIGGEST_ALIGNMENT__ > 4)

#define _kernel_trap_0(trap_name, trap_number) _kernel_trap_0to4(trap_name, trap_number)
#define _kernel_trap_1(trap_name, trap_number) _kernel_trap_0to4(trap_name, trap_number)
#define _kernel_trap_2(trap_name, trap_number) _kernel_trap_0to4(trap_name, trap_number)
#define _kernel_trap_3(trap_name, trap_number) _kernel_trap_0to4(trap_name, trap_number)
#define _kernel_trap_4(trap_name, trap_number) _kernel_trap_0to4(trap_name, trap_number)
/* _kernel_trap_5 defined above */
#define _kernel_trap_6(trap_name, trap_number) _kernel_trap_6to9(trap_name, trap_number, r4-r5, r4-r5)
/* need to save r8 not just for alignment but because mach_msg_trap overwrites the eighth argument */
#define _kernel_trap_7(trap_name, trap_number) _kernel_trap_6to9(trap_name, trap_number, r4-r6 COMMA r8, r4-r6)
#define _kernel_trap_8(trap_name, trap_number) _kernel_trap_6to9(trap_name, trap_number, r4-r6 COMMA r8, r4-r6 COMMA r8)
/* there is only one nine-argument trap (mach_msg_overwrite_trap) and it doesn't use the ninth argument */
#define _kernel_trap_9(trap_name, trap_number) _kernel_trap_8(trap_name, trap_number)

#endif // __BIGGEST_ALIGNMENT__ > 4


/* select the appropriate trap macro based off the number of args */
#define kernel_trap(trap_name, trap_number, num_args) \
	LEAF(_##trap_name, 0)	\
	_kernel_trap_##num_args(trap_name, trap_number)

#elif defined(__arm64__)

#include <mach/machine/vm_param.h>

#define kernel_trap(trap_name, trap_number, num_args) \
.globl _##trap_name                                           %% \
.text                                                         %% \
.align  2                                                     %% \
_##trap_name:                                                 %% \
    mov x16, #(trap_number)                                   %% \
    svc #SWI_SYSCALL                                          %% \
    ret

#else
#error Unsupported architecture
#endif

#endif	/* _MACH_ARM_SYSCALL_SW_H_ */
Commit	Line	Data
5ba3f43e A	1	/*
	2	* Copyright (c) 2007 Apple Inc. All rights reserved.
	3	*
	4	* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
	5	*
	6	* This file contains Original Code and/or Modifications of Original Code
	7	* as defined in and that are subject to the Apple Public Source License
	8	* Version 2.0 (the 'License'). You may not use this file except in
	9	* compliance with the License. The rights granted to you under the License
	10	* may not be used to create, or enable the creation or redistribution of,
	11	* unlawful or unlicensed copies of an Apple operating system, or to
	12	* circumvent, violate, or enable the circumvention or violation of, any
	13	* terms of an Apple operating system software license agreement.
	14	*
	15	* Please obtain a copy of the License at
	16	* http://www.opensource.apple.com/apsl/ and read it before using this file.
	17	*
	18	* The Original Code and all software distributed under the License are
	19	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
	20	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
	21	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
	22	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	23	* Please see the License for the specific language governing rights and
	24	* limitations under the License.
	25	*
	26	* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
	27	*/
	28	/*
	29	* FILE_ID: syscall_sw.h
	30	*/
	31
	32	#ifndef _MACH_ARM_SYSCALL_SW_H_
	33	#define _MACH_ARM_SYSCALL_SW_H_
	34
	35	#if defined(__arm__)
	36
	37	#include <mach/machine/vm_param.h>
	38	#include <architecture/arm/asm_help.h>
	39
	40	/* 0 to 4 args are already loaded in r0-r3 */
	41	#define _kernel_trap_0to4(trap_name, trap_number) \
	42	mov r12, # ## trap_number /* load syscall number */ ; \
	43	swi #SWI_SYSCALL ; \
	44	bx lr /* return */ ;
	45
	46	#define _kernel_trap_5(trap_name, trap_number) \
	47	mov ip, sp /* save pointer to args */ ; \
	48	stmfd sp!, { r4-r5 } /* save r4-r5, keep stack 64-bit aligned */; \
	49	ldr r4, [ ip ] /* load arg 5 */ ; \
	50	mov r12, # ## trap_number /* load syscall number */ ; \
	51	swi #SWI_SYSCALL ; \
	52	ldmfd sp!, { r4-r5 } /* restore r4-r5 */ ;\
	53	bx lr /* return */ ;
	54
	55	#define _kernel_trap_6to9(trap_name, trap_number, save_regs, arg_regs) \
	56	mov ip, sp /* save pointer to args */ ; \
	57	stmfd sp!, { save_regs } /* callee saved regs */; \
	58	ldmia ip, { arg_regs } /* load arg registers (above r0-r3) */ ;\
	59	mov r12, # ## trap_number /* load syscall number */ ; \
	60	swi #SWI_SYSCALL ; \
	61	ldmfd sp!, { save_regs } /* restore callee saved regs */ ;\
	62	bx lr /* return */ ;
	63
	64	#define COMMA ,
65
66	/* For the armv7k ABI, the alignment requirements may add padding. So we
67	* let the kernel figure it out and push extra on the stack to avoid un-needed
68	* copy-ins. We are relying on arguments that aren't in registers starting
69	* 32 bytes from sp. */
70	#if __BIGGEST_ALIGNMENT__ > 4
71
72	#define _kernel_trap_0(trap_name, trap_number) _kernel_trap_0to4(trap_name, trap_number)
73	#define _kernel_trap_1(trap_name, trap_number) _kernel_trap_0to4(trap_name, trap_number)
74	#define _kernel_trap_2(trap_name, trap_number) _kernel_trap_0to4(trap_name, trap_number)
75	#define _kernel_trap_3(trap_name, trap_number) _kernel_trap_0to4(trap_name, trap_number)
76	#define _kernel_trap_4(trap_name, trap_number) _kernel_trap_6to9(trap_name, trap_number, r4-r5, r4-r5)
77	#undef _kernel_trap_5
78	#define _kernel_trap_5(trap_name, trap_number) _kernel_trap_6to9(trap_name, trap_number, r4-r5, r4-r5)
79	#define _kernel_trap_6(trap_name, trap_number) _kernel_trap_6to9(trap_name, trap_number, r4-r6 COMMA r8, r4-r6 COMMA r8)
80	#define _kernel_trap_7(trap_name, trap_number) _kernel_trap_6to9(trap_name, trap_number, r4-r6 COMMA r8, r4-r6 COMMA r8)
81	#define _kernel_trap_8(trap_name, trap_number) _kernel_trap_6to9(trap_name, trap_number, r4-r6 COMMA r8, r4-r6 COMMA r8)
82	#define _kernel_trap_9(trap_name, trap_number) _kernel_trap_6to9(trap_name, trap_number, r4-r6 COMMA r8, r4-r6 COMMA r8)
83	#else // !(__BIGGEST_ALIGNMENT__ > 4)
84
85	#define _kernel_trap_0(trap_name, trap_number) _kernel_trap_0to4(trap_name, trap_number)
86	#define _kernel_trap_1(trap_name, trap_number) _kernel_trap_0to4(trap_name, trap_number)
87	#define _kernel_trap_2(trap_name, trap_number) _kernel_trap_0to4(trap_name, trap_number)
88	#define _kernel_trap_3(trap_name, trap_number) _kernel_trap_0to4(trap_name, trap_number)
89	#define _kernel_trap_4(trap_name, trap_number) _kernel_trap_0to4(trap_name, trap_number)
90	/* _kernel_trap_5 defined above */
91	#define _kernel_trap_6(trap_name, trap_number) _kernel_trap_6to9(trap_name, trap_number, r4-r5, r4-r5)
92	/* need to save r8 not just for alignment but because mach_msg_trap overwrites the eighth argument */
93	#define _kernel_trap_7(trap_name, trap_number) _kernel_trap_6to9(trap_name, trap_number, r4-r6 COMMA r8, r4-r6)
94	#define _kernel_trap_8(trap_name, trap_number) _kernel_trap_6to9(trap_name, trap_number, r4-r6 COMMA r8, r4-r6 COMMA r8)
95	/* there is only one nine-argument trap (mach_msg_overwrite_trap) and it doesn't use the ninth argument */
96	#define _kernel_trap_9(trap_name, trap_number) _kernel_trap_8(trap_name, trap_number)
97
98	#endif // __BIGGEST_ALIGNMENT__ > 4
99
100
101	/* select the appropriate trap macro based off the number of args */
102	#define kernel_trap(trap_name, trap_number, num_args) \
103	LEAF(_##trap_name, 0) \
104	_kernel_trap_##num_args(trap_name, trap_number)
105
106	#elif defined(__arm64__)
107
108	#include <mach/machine/vm_param.h>
109
110	#define kernel_trap(trap_name, trap_number, num_args) \
111	.globl _##trap_name %% \
112	.text %% \
113	.align 2 %% \
114	_##trap_name: %% \
115	mov x16, #(trap_number) %% \
116	svc #SWI_SYSCALL %% \
117	ret
118
119	#else
120	#error Unsupported architecture
121	#endif
122
123	#endif /* _MACH_ARM_SYSCALL_SW_H_ */