1 /* SPDX-License-Identifier: GPL-2.0-or-later *
2 /*
3 * O32 interface for the 64 (or N32) ABI.
4 *
5 * Copyright (C) 2002, 2014 Maciej W. Ro
6 */
7
8 #include <asm/asm.h>
9 #include <asm/regdef.h>
10
11 /* O32 register size. */
12 #define O32_SZREG 4
13 /* Maximum number of arguments supported. Mus
14 #define O32_ARGC 32
15 /* Number of static registers we save. */
16 #define O32_STATC 11
17 /* Argument area frame size. */
18 #define O32_ARGSZ (O32_SZREG * O32_ARGC)
19 /* Static register save area frame size. */
20 #define O32_STATSZ (SZREG * O32_STATC)
21 /* Stack pointer register save area frame size
22 #define O32_SPSZ SZREG
23 /* Combined area frame size. */
24 #define O32_FRAMESZ (O32_ARGSZ + O32_SPSZ
25 /* Switched stack frame size. */
26 #define O32_NFRAMESZ (O32_ARGSZ + O32_SPSZ)
27
28 .text
29
30 /*
31 * O32 function call dispatcher, for interfaci
32 *
33 * The standard 64 (N32) calling sequence is s
34 * a function pointer, a1 a pointer to the new
35 * function with or 0 if no stack switching is
36 * function call's first six arguments, and th
37 * arguments (up to O32_ARGC, including a2-a7)
38 * and fp are preserved, v0 holds the result.
39 * called o32 function for sp and ra restorati
40 * to be placed in a KSEGx (or KUSEG) address
41 * passed have to point to addresses within on
42 */
43 NESTED(call_o32, O32_FRAMESZ, ra)
44 REG_SUBU sp,O32_FRAMESZ
45
46 REG_S ra,O32_FRAMESZ
47 REG_S fp,O32_FRAMESZ
48 REG_S gp,O32_FRAMESZ
49 REG_S s7,O32_FRAMESZ
50 REG_S s6,O32_FRAMESZ
51 REG_S s5,O32_FRAMESZ
52 REG_S s4,O32_FRAMESZ
53 REG_S s3,O32_FRAMESZ
54 REG_S s2,O32_FRAMESZ
55 REG_S s1,O32_FRAMESZ
56 REG_S s0,O32_FRAMESZ
57
58 move jp,a0
59
60 move fp,sp
61 beqz a1,0f
62 REG_SUBU fp,a1,O32_NFRA
63 0:
64 REG_S sp,O32_NFRAMES
65
66 sll a0,a2,zero
67 sll a1,a3,zero
68 sll a2,a4,zero
69 sll a3,a5,zero
70 sw a6,4*O32_SZREG
71 sw a7,5*O32_SZREG
72
73 PTR_LA t0,O32_FRAMESZ
74 PTR_LA t1,6*O32_SZREG
75 li t2,O32_ARGC-6
76 1:
77 lw t3,(t0)
78 REG_ADDU t0,SZREG
79 sw t3,(t1)
80 REG_SUBU t2,1
81 REG_ADDU t1,O32_SZREG
82 bnez t2,1b
83
84 move sp,fp
85
86 jalr jp
87
88 REG_L sp,O32_NFRAMES
89
90 REG_L s0,O32_FRAMESZ
91 REG_L s1,O32_FRAMESZ
92 REG_L s2,O32_FRAMESZ
93 REG_L s3,O32_FRAMESZ
94 REG_L s4,O32_FRAMESZ
95 REG_L s5,O32_FRAMESZ
96 REG_L s6,O32_FRAMESZ
97 REG_L s7,O32_FRAMESZ
98 REG_L gp,O32_FRAMESZ
99 REG_L fp,O32_FRAMESZ
100 REG_L ra,O32_FRAMESZ
101
102 REG_ADDU sp,O32_FRAMESZ
103 jr ra
104 END(call_o32)
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