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android_kernel_...
/
arch
/
riscv
/
include
/
asm
/
jump_label.h

jump_label.h 1.4 KB
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  1. /* SPDX-License-Identifier: GPL-2.0-only */
    2. 

  2. /*
    3. 

  3.  * Copyright (C) 2020 Emil Renner Berthing
    4. 

  4.  *
    5. 

  5.  * Based on arch/arm64/include/asm/jump_label.h
    6. 

  6.  */
    7. 

  7. #ifndef __ASM_JUMP_LABEL_H
    8. 

  8. #define __ASM_JUMP_LABEL_H
    9. 

  9. 

  10. #ifndef __ASSEMBLY__
    11. 

  11. 

  12. #include <linux/types.h>
    13. 

  13. #include <asm/asm.h>
    14. 

  14. 

  15. #define JUMP_LABEL_NOP_SIZE 4
    16. 

  16. 

  17. static __always_inline bool arch_static_branch(struct static_key * const key,
    18. 

  18. 					       const bool branch)
    19. 

  19. {
    20. 

  20. 	asm_volatile_goto(
    21. 

  21. 		"	.align		2			\n\t"
    22. 

  22. 		"	.option push				\n\t"
    23. 

  23. 		"	.option norelax				\n\t"
    24. 

  24. 		"	.option norvc				\n\t"
    25. 

  25. 		"1:	nop					\n\t"
    26. 

  26. 		"	.option pop				\n\t"
    27. 

  27. 		"	.pushsection	__jump_table, \"aw\"	\n\t"
    28. 

  28. 		"	.align		" RISCV_LGPTR "		\n\t"
    29. 

  29. 		"	.long		1b - ., %l[label] - .	\n\t"
    30. 

  30. 		"	" RISCV_PTR "	%0 - .			\n\t"
    31. 

  31. 		"	.popsection				\n\t"
    32. 

  32. 		:  :  "i"(&((char *)key)[branch]) :  : label);
    33. 

  33. 

  34. 	return false;
    35. 

  35. label:
    36. 

  36. 	return true;
    37. 

  37. }
    38. 

  38. 

  39. static __always_inline bool arch_static_branch_jump(struct static_key * const key,
    40. 

  40. 						    const bool branch)
    41. 

  41. {
    42. 

  42. 	asm_volatile_goto(
    43. 

  43. 		"	.align		2			\n\t"
    44. 

  44. 		"	.option push				\n\t"
    45. 

  45. 		"	.option norelax				\n\t"
    46. 

  46. 		"	.option norvc				\n\t"
    47. 

  47. 		"1:	jal		zero, %l[label]		\n\t"
    48. 

  48. 		"	.option pop				\n\t"
    49. 

  49. 		"	.pushsection	__jump_table, \"aw\"	\n\t"
    50. 

  50. 		"	.align		" RISCV_LGPTR "		\n\t"
    51. 

  51. 		"	.long		1b - ., %l[label] - .	\n\t"
    52. 

  52. 		"	" RISCV_PTR "	%0 - .			\n\t"
    53. 

  53. 		"	.popsection				\n\t"
    54. 

  54. 		:  :  "i"(&((char *)key)[branch]) :  : label);
    55. 

  55. 

  56. 	return false;
    57. 

  57. label:
    58. 

  58. 	return true;
    59. 

  59. }
    60. 

  60. 

  61. #endif  /* __ASSEMBLY__ */
    62. 

  62. #endif	/* __ASM_JUMP_LABEL_H */
    63.