FilesExpand file tree

 main

/

nlraarch64.c

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

85 lines (76 loc) · 2.99 KB

 main

/

nlraarch64.c

Copy path

Top

File metadata and controls

• Code
• Blame

85 lines (76 loc) · 2.99 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

75

76

77

78

79

80

81

82

83

84

85

/*

* This file is part of the MicroPython project, http://micropython.org/

*

* The MIT License (MIT)

*

* Copyright (c) 2021 Yonatan Goldschmidt

*

* Permission is hereby granted, free of charge, to any person obtaining a copy

* of this software and associated documentation files (the "Software"), to deal

* in the Software without restriction, including without limitation the rights

* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

* copies of the Software, and to permit persons to whom the Software is

* furnished to do so, subject to the following conditions:

*

* The above copyright notice and this permission notice shall be included in

* all copies or substantial portions of the Software.

*

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

* THE SOFTWARE.

*/

#include "py/mpstate.h" // needed for NLR defs

// CIRCUITPY-CHANGE: avoid warnings

#if defined(MICROPY_NLR_AARCH64) && MICROPY_NLR_AARCH64

// AArch64 callee-saved registers are x19-x29.

// https://en.wikipedia.org/wiki/Calling_convention#ARM_(A64)

// Implemented purely as inline assembly; inside a function, we have to deal with undoing the prologue, restoring

// SP and LR. This way, we don't.

__asm(

#if defined(__APPLE__) && defined(__MACH__)

"_nlr_push: \n"

".global _nlr_push \n"

#else

"nlr_push: \n"

".global nlr_push \n"

#endif

"mov x9, sp \n"

"stp lr, x9, [x0, #16]\n" // 16 == offsetof(nlr_buf_t, regs)

"stp x19, x20, [x0, #32]\n"

"stp x21, x22, [x0, #48]\n"

"stp x23, x24, [x0, #64]\n"

"stp x25, x26, [x0, #80]\n"

"stp x27, x28, [x0, #96]\n"

"str x29, [x0, #112]\n"

#if defined(__APPLE__) && defined(__MACH__)

"b _nlr_push_tail \n" // do the rest in C

#else

"b nlr_push_tail \n" // do the rest in C

#endif

);

NORETURN void nlr_jump(void *val) {

MP_NLR_JUMP_HEAD(val, top)

MP_STATIC_ASSERT(offsetof(nlr_buf_t, regs) == 16); // asm assumes it

__asm volatile (

"mov x0, %0 \n"

"ldr x29, [x0, #112]\n"

"ldp x27, x28, [x0, #96]\n"

"ldp x25, x26, [x0, #80]\n"

"ldp x23, x24, [x0, #64]\n"

"ldp x21, x22, [x0, #48]\n"

"ldp x19, x20, [x0, #32]\n"

"ldp lr, x9, [x0, #16]\n" // 16 == offsetof(nlr_buf_t, regs)

"mov sp, x9 \n"

"mov x0, #1 \n" // non-local return

"ret \n"

:

: "r" (top)

: "memory"

);

MP_UNREACHABLE

}

#endif // MICROPY_NLR_AARCH64