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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. Rozycki
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. Must be even! */
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 + O32_STATSZ)
25/* Switched stack frame size. */
26#define O32_NFRAMESZ (O32_ARGSZ + O32_SPSZ)
27
28 .text
29
30/*
31 * O32 function call dispatcher, for interfacing 32-bit ROM routines.
32 *
33 * The standard 64 (N32) calling sequence is supported, with a0 holding
34 * a function pointer, a1 a pointer to the new stack to call the
35 * function with or 0 if no stack switching is requested, a2-a7 -- the
36 * function call's first six arguments, and the stack -- the remaining
37 * arguments (up to O32_ARGC, including a2-a7). Static registers, gp
38 * and fp are preserved, v0 holds the result. This code relies on the
39 * called o32 function for sp and ra restoration and this dispatcher has
40 * to be placed in a KSEGx (or KUSEG) address space. Any pointers
41 * passed have to point to addresses within one of these spaces as well.
42 */
43NESTED(call_o32, O32_FRAMESZ, ra)
44 REG_SUBU sp,O32_FRAMESZ
45
46 REG_S ra,O32_FRAMESZ-1*SZREG(sp)
47 REG_S fp,O32_FRAMESZ-2*SZREG(sp)
48 REG_S gp,O32_FRAMESZ-3*SZREG(sp)
49 REG_S s7,O32_FRAMESZ-4*SZREG(sp)
50 REG_S s6,O32_FRAMESZ-5*SZREG(sp)
51 REG_S s5,O32_FRAMESZ-6*SZREG(sp)
52 REG_S s4,O32_FRAMESZ-7*SZREG(sp)
53 REG_S s3,O32_FRAMESZ-8*SZREG(sp)
54 REG_S s2,O32_FRAMESZ-9*SZREG(sp)
55 REG_S s1,O32_FRAMESZ-10*SZREG(sp)
56 REG_S s0,O32_FRAMESZ-11*SZREG(sp)
57
58 move jp,a0
59
60 move fp,sp
61 beqz a1,0f
62 REG_SUBU fp,a1,O32_NFRAMESZ
630:
64 REG_S sp,O32_NFRAMESZ-1*SZREG(fp)
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(fp)
71 sw a7,5*O32_SZREG(fp)
72
73 PTR_LA t0,O32_FRAMESZ(sp)
74 PTR_LA t1,6*O32_SZREG(fp)
75 li t2,O32_ARGC-6
761:
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_NFRAMESZ-1*SZREG(sp)
89
90 REG_L s0,O32_FRAMESZ-11*SZREG(sp)
91 REG_L s1,O32_FRAMESZ-10*SZREG(sp)
92 REG_L s2,O32_FRAMESZ-9*SZREG(sp)
93 REG_L s3,O32_FRAMESZ-8*SZREG(sp)
94 REG_L s4,O32_FRAMESZ-7*SZREG(sp)
95 REG_L s5,O32_FRAMESZ-6*SZREG(sp)
96 REG_L s6,O32_FRAMESZ-5*SZREG(sp)
97 REG_L s7,O32_FRAMESZ-4*SZREG(sp)
98 REG_L gp,O32_FRAMESZ-3*SZREG(sp)
99 REG_L fp,O32_FRAMESZ-2*SZREG(sp)
100 REG_L ra,O32_FRAMESZ-1*SZREG(sp)
101
102 REG_ADDU sp,O32_FRAMESZ
103 jr ra
104END(call_o32)
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. Rozycki
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. Must be even! */
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 + O32_STATSZ)
25/* Switched stack frame size. */
26#define O32_NFRAMESZ (O32_ARGSZ + O32_SPSZ)
27
28 .text
29
30/*
31 * O32 function call dispatcher, for interfacing 32-bit ROM routines.
32 *
33 * The standard 64 (N32) calling sequence is supported, with a0 holding
34 * a function pointer, a1 a pointer to the new stack to call the
35 * function with or 0 if no stack switching is requested, a2-a7 -- the
36 * function call's first six arguments, and the stack -- the remaining
37 * arguments (up to O32_ARGC, including a2-a7). Static registers, gp
38 * and fp are preserved, v0 holds the result. This code relies on the
39 * called o32 function for sp and ra restoration and this dispatcher has
40 * to be placed in a KSEGx (or KUSEG) address space. Any pointers
41 * passed have to point to addresses within one of these spaces as well.
42 */
43NESTED(call_o32, O32_FRAMESZ, ra)
44 REG_SUBU sp,O32_FRAMESZ
45
46 REG_S ra,O32_FRAMESZ-1*SZREG(sp)
47 REG_S fp,O32_FRAMESZ-2*SZREG(sp)
48 REG_S gp,O32_FRAMESZ-3*SZREG(sp)
49 REG_S s7,O32_FRAMESZ-4*SZREG(sp)
50 REG_S s6,O32_FRAMESZ-5*SZREG(sp)
51 REG_S s5,O32_FRAMESZ-6*SZREG(sp)
52 REG_S s4,O32_FRAMESZ-7*SZREG(sp)
53 REG_S s3,O32_FRAMESZ-8*SZREG(sp)
54 REG_S s2,O32_FRAMESZ-9*SZREG(sp)
55 REG_S s1,O32_FRAMESZ-10*SZREG(sp)
56 REG_S s0,O32_FRAMESZ-11*SZREG(sp)
57
58 move jp,a0
59
60 move fp,sp
61 beqz a1,0f
62 REG_SUBU fp,a1,O32_NFRAMESZ
630:
64 REG_S sp,O32_NFRAMESZ-1*SZREG(fp)
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(fp)
71 sw a7,5*O32_SZREG(fp)
72
73 PTR_LA t0,O32_FRAMESZ(sp)
74 PTR_LA t1,6*O32_SZREG(fp)
75 li t2,O32_ARGC-6
761:
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_NFRAMESZ-1*SZREG(sp)
89
90 REG_L s0,O32_FRAMESZ-11*SZREG(sp)
91 REG_L s1,O32_FRAMESZ-10*SZREG(sp)
92 REG_L s2,O32_FRAMESZ-9*SZREG(sp)
93 REG_L s3,O32_FRAMESZ-8*SZREG(sp)
94 REG_L s4,O32_FRAMESZ-7*SZREG(sp)
95 REG_L s5,O32_FRAMESZ-6*SZREG(sp)
96 REG_L s6,O32_FRAMESZ-5*SZREG(sp)
97 REG_L s7,O32_FRAMESZ-4*SZREG(sp)
98 REG_L gp,O32_FRAMESZ-3*SZREG(sp)
99 REG_L fp,O32_FRAMESZ-2*SZREG(sp)
100 REG_L ra,O32_FRAMESZ-1*SZREG(sp)
101
102 REG_ADDU sp,O32_FRAMESZ
103 jr ra
104END(call_o32)