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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _SELFTESTS_POWERPC_BASIC_ASM_H
3#define _SELFTESTS_POWERPC_BASIC_ASM_H
4
5#include <ppc-asm.h>
6#include <asm/unistd.h>
7
8#ifdef __powerpc64__
9#define PPC_LL ld
10#define PPC_STL std
11#define PPC_STLU stdu
12#else
13#define PPC_LL lwz
14#define PPC_STL stw
15#define PPC_STLU stwu
16#endif
17
18#define LOAD_REG_IMMEDIATE(reg, expr) \
19 lis reg, (expr)@highest; \
20 ori reg, reg, (expr)@higher; \
21 rldicr reg, reg, 32, 31; \
22 oris reg, reg, (expr)@high; \
23 ori reg, reg, (expr)@l;
24
25/*
26 * Note: These macros assume that variables being stored on the stack are
27 * sizeof(long), while this is usually the case it may not always be the
28 * case for each use case.
29 */
30#ifdef __powerpc64__
31
32// ABIv2
33#if defined(_CALL_ELF) && _CALL_ELF == 2
34#define STACK_FRAME_MIN_SIZE 32
35#define STACK_FRAME_TOC_POS 24
36#define __STACK_FRAME_PARAM(_param) (32 + ((_param)*8))
37#define __STACK_FRAME_LOCAL(_num_params, _var_num) \
38 ((STACK_FRAME_PARAM(_num_params)) + ((_var_num)*8))
39
40#else // ABIv1 below
41#define STACK_FRAME_MIN_SIZE 112
42#define STACK_FRAME_TOC_POS 40
43#define __STACK_FRAME_PARAM(i) (48 + ((i)*8))
44
45/*
46 * Caveat: if a function passed more than 8 doublewords, the caller will have
47 * made more space... which would render the 112 incorrect.
48 */
49#define __STACK_FRAME_LOCAL(_num_params, _var_num) \
50 (112 + ((_var_num)*8))
51
52
53#endif // ABIv2
54
55// Common 64-bit
56#define STACK_FRAME_LR_POS 16
57#define STACK_FRAME_CR_POS 8
58
59#else // 32-bit below
60
61#define STACK_FRAME_MIN_SIZE 16
62#define STACK_FRAME_LR_POS 4
63
64#define __STACK_FRAME_PARAM(_param) (STACK_FRAME_MIN_SIZE + ((_param)*4))
65#define __STACK_FRAME_LOCAL(_num_params, _var_num) \
66 ((STACK_FRAME_PARAM(_num_params)) + ((_var_num)*4))
67
68#endif // __powerpc64__
69
70/* Parameter x saved to the stack */
71#define STACK_FRAME_PARAM(var) __STACK_FRAME_PARAM(var)
72
73/* Local variable x saved to the stack after x parameters */
74#define STACK_FRAME_LOCAL(num_params, var) \
75 __STACK_FRAME_LOCAL(num_params, var)
76
77/*
78 * It is very important to note here that _extra is the extra amount of
79 * stack space needed. This space can be accessed using STACK_FRAME_PARAM()
80 * or STACK_FRAME_LOCAL() macros.
81 *
82 * r1 and r2 are not defined in ppc-asm.h (instead they are defined as sp
83 * and toc). Kernel programmers tend to prefer rX even for r1 and r2, hence
84 * %1 and %r2. r0 is defined in ppc-asm.h and therefore %r0 gets
85 * preprocessed incorrectly, hence r0.
86 */
87#define PUSH_BASIC_STACK(_extra) \
88 mflr r0; \
89 PPC_STL r0, STACK_FRAME_LR_POS(%r1); \
90 PPC_STLU %r1, -(((_extra + 15) & ~15) + STACK_FRAME_MIN_SIZE)(%r1);
91
92#define POP_BASIC_STACK(_extra) \
93 addi %r1, %r1, (((_extra + 15) & ~15) + STACK_FRAME_MIN_SIZE); \
94 PPC_LL r0, STACK_FRAME_LR_POS(%r1); \
95 mtlr r0;
96
97.macro OP_REGS op, reg_width, start_reg, end_reg, base_reg, base_reg_offset=0, skip=0
98 .set i, \start_reg
99 .rept (\end_reg - \start_reg + 1)
100 \op i, (\reg_width * (i - \skip) + \base_reg_offset)(\base_reg)
101 .set i, i + 1
102 .endr
103.endm
104
105#endif /* _SELFTESTS_POWERPC_BASIC_ASM_H */