Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/mips/fw/lib/call_o32.S
10820 views
1
/*

2
 *	O32 interface for the 64 (or N32) ABI.

3
 *

4
 *	Copyright (C) 2002  Maciej W. Rozycki

5
 *

6
 *	This program is free software; you can redistribute it and/or

7
 *	modify it under the terms of the GNU General Public License

8
 *	as published by the Free Software Foundation; either version

9
 *	2 of the License, or (at your option) any later version.

10
 */

11


12
#include <asm/asm.h>

13
#include <asm/regdef.h>

14


15
/* Maximum number of arguments supported.  Must be even!  */

16
#define O32_ARGC	32

17
/* Number of static registers we save.  */

18
#define O32_STATC	11

19
/* Frame size for static register  */

20
#define O32_FRAMESZ	(SZREG * O32_STATC)

21
/* Frame size on new stack */

22
#define O32_FRAMESZ_NEW (SZREG + 4 * O32_ARGC)

23


24
		.text

25


26
/*

27
 * O32 function call dispatcher, for interfacing 32-bit ROM routines.

28
 *

29
 * The standard 64 (N32) calling sequence is supported, with a0

30
 * holding a function pointer, a1 a new stack pointer, a2-a7 -- its

31
 * first six arguments and the stack -- remaining ones (up to O32_ARGC,

32
 * including a2-a7). Static registers, gp and fp are preserved, v0 holds

33
 * a result. This code relies on the called o32 function for sp and ra

34
 * restoration and this dispatcher has to be placed in a KSEGx (or KUSEG)

35
 * address space.  Any pointers passed have to point to addresses within

36
 * one of these spaces as well.

37
 */

38
NESTED(call_o32, O32_FRAMESZ, ra)

39
		REG_SUBU	sp,O32_FRAMESZ

40


41
		REG_S		ra,O32_FRAMESZ-1*SZREG(sp)

42
		REG_S		fp,O32_FRAMESZ-2*SZREG(sp)

43
		REG_S		gp,O32_FRAMESZ-3*SZREG(sp)

44
		REG_S		s7,O32_FRAMESZ-4*SZREG(sp)

45
		REG_S		s6,O32_FRAMESZ-5*SZREG(sp)

46
		REG_S		s5,O32_FRAMESZ-6*SZREG(sp)

47
		REG_S		s4,O32_FRAMESZ-7*SZREG(sp)

48
		REG_S		s3,O32_FRAMESZ-8*SZREG(sp)

49
		REG_S		s2,O32_FRAMESZ-9*SZREG(sp)

50
		REG_S		s1,O32_FRAMESZ-10*SZREG(sp)

51
		REG_S		s0,O32_FRAMESZ-11*SZREG(sp)

52


53
		move		jp,a0

54
		REG_SUBU	s0,a1,O32_FRAMESZ_NEW

55
		REG_S		sp,O32_FRAMESZ_NEW-1*SZREG(s0)

56


57
		sll		a0,a2,zero

58
		sll		a1,a3,zero

59
		sll		a2,a4,zero

60
		sll		a3,a5,zero

61
		sw		a6,0x10(s0)

62
		sw		a7,0x14(s0)

63


64
		PTR_LA		t0,O32_FRAMESZ(sp)

65
		PTR_LA		t1,0x18(s0)

66
		li		t2,O32_ARGC-6

67
1:

68
		lw		t3,(t0)

69
		REG_ADDU	t0,SZREG

70
		sw		t3,(t1)

71
		REG_SUBU	t2,1

72
		REG_ADDU	t1,4

73
		bnez		t2,1b

74


75
		move		sp,s0

76


77
		jalr		jp

78


79
		REG_L		sp,O32_FRAMESZ_NEW-1*SZREG(sp)

80


81
		REG_L		s0,O32_FRAMESZ-11*SZREG(sp)

82
		REG_L		s1,O32_FRAMESZ-10*SZREG(sp)

83
		REG_L		s2,O32_FRAMESZ-9*SZREG(sp)

84
		REG_L		s3,O32_FRAMESZ-8*SZREG(sp)

85
		REG_L		s4,O32_FRAMESZ-7*SZREG(sp)

86
		REG_L		s5,O32_FRAMESZ-6*SZREG(sp)

87
		REG_L		s6,O32_FRAMESZ-5*SZREG(sp)

88
		REG_L		s7,O32_FRAMESZ-4*SZREG(sp)

89
		REG_L		gp,O32_FRAMESZ-3*SZREG(sp)

90
		REG_L		fp,O32_FRAMESZ-2*SZREG(sp)

91
		REG_L		ra,O32_FRAMESZ-1*SZREG(sp)

92


93
		REG_ADDU	sp,O32_FRAMESZ

94
		jr		ra

95
END(call_o32)

96


97