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	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_ */

1

/*

2

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_

#if defined(__arm__)

#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 */ ; \

swi #SWI_SYSCALL ; \

bx lr /* return */ ;

#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 */ ;\

bx lr /* return */ ;

#define COMMA ,

/* 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 %% \

.text %% \

.align 2 %% \

_##trap_name: %% \

mov x16, #(trap_number) %% \

116

svc #SWI_SYSCALL %% \

ret

#else

#error Unsupported architecture

121

#endif

122

123

#endif /* _MACH_ARM_SYSCALL_SW_H_ */