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RD_Software
/
ark1668ed-bsp
2
0
انشعاب 0
پرونده‌ها مشکلات 0 درخواست واکشی 0 ویکی
شاخه: develop
شاخه‌ها تگ‌ها
ark1668ed-bsp
/
linux
/
arch
/
loongarch
/
kernel
/
entry.S

entry.S 2.1 KB
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  1. /* SPDX-License-Identifier: GPL-2.0 */
    2. 

  2. /*
    3. 

  3.  * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
    4. 

  4.  *
    5. 

  5.  * Derived from MIPS:
    6. 

  6.  * Copyright (C) 1994 - 2000, 2001, 2003 Ralf Baechle
    7. 

  7.  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
    8. 

  8.  * Copyright (C) 2001 MIPS Technologies, Inc.
    9. 

  9.  */
    10. 

  10. 

  11. #include <asm/asm.h>
    12. 

  12. #include <asm/asmmacro.h>
    13. 

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

  14. #include <asm/regdef.h>
    15. 

  15. #include <asm/stackframe.h>
    16. 

  16. #include <asm/thread_info.h>
    17. 

  17. #include <asm/unwind_hints.h>
    18. 

  18. 

  19. 	.text
    20. 

  20. 	.cfi_sections	.debug_frame
    21. 

  21. 	.align	5
    22. 

  22. SYM_CODE_START(handle_syscall)
    23. 

  23. 	UNWIND_HINT_UNDEFINED
    24. 

  24. 	csrrd		t0, PERCPU_BASE_KS
    25. 

  25. 	la.pcrel	t1, kernelsp
    26. 

  26. 	add.d		t1, t1, t0
    27. 

  27. 	move		t2, sp
    28. 

  28. 	ld.d		sp, t1, 0
    29. 

  29. 

  30. 	addi.d		sp, sp, -PT_SIZE
    31. 

  31. 	cfi_st		t2, PT_R3
    32. 

  32. 	cfi_rel_offset	sp, PT_R3
    33. 

  33. 	st.d		zero, sp, PT_R0
    34. 

  34. 	csrrd		t2, LOONGARCH_CSR_PRMD
    35. 

  35. 	st.d		t2, sp, PT_PRMD
    36. 

  36. 	csrrd		t2, LOONGARCH_CSR_CRMD
    37. 

  37. 	st.d		t2, sp, PT_CRMD
    38. 

  38. 	csrrd		t2, LOONGARCH_CSR_EUEN
    39. 

  39. 	st.d		t2, sp, PT_EUEN
    40. 

  40. 	csrrd		t2, LOONGARCH_CSR_ECFG
    41. 

  41. 	st.d		t2, sp, PT_ECFG
    42. 

  42. 	csrrd		t2, LOONGARCH_CSR_ESTAT
    43. 

  43. 	st.d		t2, sp, PT_ESTAT
    44. 

  44. 	cfi_st		ra, PT_R1
    45. 

  45. 	cfi_st		a0, PT_R4
    46. 

  46. 	cfi_st		a1, PT_R5
    47. 

  47. 	cfi_st		a2, PT_R6
    48. 

  48. 	cfi_st		a3, PT_R7
    49. 

  49. 	cfi_st		a4, PT_R8
    50. 

  50. 	cfi_st		a5, PT_R9
    51. 

  51. 	cfi_st		a6, PT_R10
    52. 

  52. 	cfi_st		a7, PT_R11
    53. 

  53. 	csrrd		ra, LOONGARCH_CSR_ERA
    54. 

  54. 	st.d		ra, sp, PT_ERA
    55. 

  55. 	cfi_rel_offset	ra, PT_ERA
    56. 

  56. 

  57. 	cfi_st		tp, PT_R2
    58. 

  58. 	cfi_st		u0, PT_R21
    59. 

  59. 	cfi_st		fp, PT_R22
    60. 

  60. 

  61. 	SAVE_STATIC
    62. 

  62. 	UNWIND_HINT_REGS
    63. 

  63. 

  64. #ifdef CONFIG_KGDB
    65. 

  65. 	li.w		t1, CSR_CRMD_WE
    66. 

  66. 	csrxchg		t1, t1, LOONGARCH_CSR_CRMD
    67. 

  67. #endif
    68. 

  68. 

  69. 	move		u0, t0
    70. 

  70. 	li.d		tp, ~_THREAD_MASK
    71. 

  71. 	and		tp, tp, sp
    72. 

  72. 

  73. 	move		a0, sp
    74. 

  74. 	bl		do_syscall
    75. 

  75. 

  76. 	RESTORE_ALL_AND_RET
    77. 

  77. SYM_CODE_END(handle_syscall)
    78. 

  78. _ASM_NOKPROBE(handle_syscall)
    79. 

  79. 

  80. SYM_CODE_START(ret_from_fork)
    81. 

  81. 	UNWIND_HINT_REGS
    82. 

  82. 	bl		schedule_tail		# a0 = struct task_struct *prev
    83. 

  83. 	move		a0, sp
    84. 

  84. 	bl 		syscall_exit_to_user_mode
    85. 

  85. 	RESTORE_STATIC
    86. 

  86. 	RESTORE_SOME
    87. 

  87. 	RESTORE_SP_AND_RET
    88. 

  88. SYM_CODE_END(ret_from_fork)
    89. 

  89. 

  90. SYM_CODE_START(ret_from_kernel_thread)
    91. 

  91. 	UNWIND_HINT_REGS
    92. 

  92. 	bl		schedule_tail		# a0 = struct task_struct *prev
    93. 

  93. 	move		a0, s1
    94. 

  94. 	jirl		ra, s0, 0
    95. 

  95. 	move		a0, sp
    96. 

  96. 	bl		syscall_exit_to_user_mode
    97. 

  97. 	RESTORE_STATIC
    98. 

  98. 	RESTORE_SOME
    99. 

  99. 	RESTORE_SP_AND_RET
    100. 

  100. SYM_CODE_END(ret_from_kernel_thread)
    101.