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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
6 #include <asm/unistd.h>
8 #define LOAD_REG_IMMEDIATE(reg, expr) \
9 lis reg, (expr)@highest; \
10 ori reg, reg, (expr)@higher; \
11 rldicr reg, reg, 32, 31; \
12 oris reg, reg, (expr)@high; \
13 ori reg, reg, (expr)@l;
16 * Note: These macros assume that variables being stored on the stack are
17 * doublewords, while this is usually the case it may not always be the
18 * case for each use case.
20 #if defined(_CALL_ELF) && _CALL_ELF == 2
21 #define STACK_FRAME_MIN_SIZE 32
22 #define STACK_FRAME_TOC_POS 24
23 #define __STACK_FRAME_PARAM(_param) (32 + ((_param)*8))
24 #define __STACK_FRAME_LOCAL(_num_params, _var_num) \
25 ((STACK_FRAME_PARAM(_num_params)) + ((_var_num)*8))
27 #define STACK_FRAME_MIN_SIZE 112
28 #define STACK_FRAME_TOC_POS 40
29 #define __STACK_FRAME_PARAM(i) (48 + ((i)*8))
32 * Caveat: if a function passed more than 8 doublewords, the caller will have
33 * made more space... which would render the 112 incorrect.
35 #define __STACK_FRAME_LOCAL(_num_params, _var_num) \
36 (112 + ((_var_num)*8))
39 /* Parameter x saved to the stack */
40 #define STACK_FRAME_PARAM(var) __STACK_FRAME_PARAM(var)
42 /* Local variable x saved to the stack after x parameters */
43 #define STACK_FRAME_LOCAL(num_params, var) \
44 __STACK_FRAME_LOCAL(num_params, var)
45 #define STACK_FRAME_LR_POS 16
46 #define STACK_FRAME_CR_POS 8
49 * It is very important to note here that _extra is the extra amount of
50 * stack space needed. This space can be accessed using STACK_FRAME_PARAM()
51 * or STACK_FRAME_LOCAL() macros.
53 * r1 and r2 are not defined in ppc-asm.h (instead they are defined as sp
54 * and toc). Kernel programmers tend to prefer rX even for r1 and r2, hence
55 * %1 and %r2. r0 is defined in ppc-asm.h and therefore %r0 gets
56 * preprocessed incorrectly, hence r0.
58 #define PUSH_BASIC_STACK(_extra) \
60 std r0, STACK_FRAME_LR_POS(%r1); \
61 stdu %r1, -(_extra + STACK_FRAME_MIN_SIZE)(%r1); \
63 stw r0, STACK_FRAME_CR_POS(%r1); \
64 std %r2, STACK_FRAME_TOC_POS(%r1);
66 #define POP_BASIC_STACK(_extra) \
67 ld %r2, STACK_FRAME_TOC_POS(%r1); \
68 lwz r0, STACK_FRAME_CR_POS(%r1); \
70 addi %r1, %r1, (_extra + STACK_FRAME_MIN_SIZE); \
71 ld r0, STACK_FRAME_LR_POS(%r1); \
74 #endif /* _SELFTESTS_POWERPC_BASIC_ASM_H */