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syscall.S

syscall.S 1.9 KB
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  1. /* Copyright (C) 1996, 1997 Free Software Foundation, Inc.
    2. 

  2.    This file is part of the GNU C Library.
    3. 

  3. 

  4.    The GNU C Library is free software; you can redistribute it and/or
    5. 

  5.    modify it under the terms of the GNU Lesser General Public
    6. 

  6.    License as published by the Free Software Foundation; either
    7. 

  7.    version 2.1 of the License, or (at your option) any later version.
    8. 

  8. 

  9.    The GNU C Library is distributed in the hope that it will be useful,
    10. 

  10.    but WITHOUT ANY WARRANTY; without even the implied warranty of
    11. 

  11.    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    12. 

  12.    Lesser General Public License for more details.
    13. 

  13. 

  14.    You should have received a copy of the GNU Lesser General Public
    15. 

  15.    License along with the GNU C Library; if not, see
    16. 

  16.    <http://www.gnu.org/licenses/>.  */
    17. 

  17. 

  18. #include <features.h>
    19. 

  19. #include <sys/asm.h>
    20. 

  20. #include <sys/regdef.h>
    21. 

  21. 

  22. #ifdef __PIC__
    23. 

  23. 	.option pic2
    24. 

  24. #endif
    25. 

  25. .text
    26. 

  26. .align  2
    27. 

  27. .globl  syscall
    28. 

  28. .type   syscall,@function
    29. 

  29. .ent    syscall
    30. 

  30. syscall:
    31. 

  31. #ifdef __PIC__
    32. 

  32. 	SETUP_GP
    33. 

  33. #endif
    34. 

  34. 	move	v0, a0		/* Load system call number from first arg.  */
    35. 

  35. 	move	a0, a1		/* Move the next three args up a register.  */
    36. 

  36. 	move	a1, a2
    37. 

  37. 	move	a2, a3
    38. 

  38.      	/* Load the remaining possible args (up to 7) from the stack.  */
    39. 

  39. #ifdef __mips64
    40. 

  40. 	move	a3, a4
    41. 

  41. 	move	a4, a5
    42. 

  42. 	move	a5, a6
    43. 

  43. 	move	a6, a7
    44. 

  44. 	daddiu	sp,sp,-16
    45. 

  45. 	sd	v0,0*8(sp)
    46. 

  46. 	ld	v0,0*8(sp)	/* for system call restarts */
    47. 

  47. #else
    48. 

  48. 	lw	a3,4*4(sp)
    49. 

  49. 	lw	t0,5*4(sp)
    50. 

  50. 	lw	t1,6*4(sp)
    51. 

  51. 	lw	t2,7*4(sp)
    52. 

  52. 	addiu	sp,sp,-32
    53. 

  53. 	sw	t0,4*4(sp)
    54. 

  54. 	sw	t1,5*4(sp)
    55. 

  55. 	sw	t2,6*4(sp)
    56. 

  56. 	sw	v0,7*4(sp)
    57. 

  57. 	lw	v0,7*4(sp)	/* for system call restarts */
    58. 

  58. #endif
    59. 

  59. 	syscall			/* Do the system call.  */
    60. 

  60. #ifdef __mips64
    61. 

  61. 	daddiu	sp,sp,16
    62. 

  62. #else
    63. 

  63. 	addiu	sp,sp,32
    64. 

  64. #endif
    65. 

  65. 	bnez	a3, 1f
    66. 

  66.      	j ra			/* Return to caller.  */
    67. 

  67. 1:
    68. 

  68. 	move	a0,v0		/* Pass return val to C function. */
    69. 

  69. 

  70. #ifdef __PIC__
    71. 

  71. 	SETUP_GP64(v0, syscall)
    72. 

  72. 	PTR_LA	t9, __syscall_error
    73. 

  73. 	RESTORE_GP64
    74. 

  74. 	jr	t9
    75. 

  75. #else
    76. 

  76. 	j	__syscall_error
    77. 

  77. #endif
    78. 

  78. .end    syscall
    79. 

  79. .size   syscall,.-syscall
    80.