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74 lines
2.3 KiB
74 lines
2.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _SELFTESTS_POWERPC_BASIC_ASM_H |
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#define _SELFTESTS_POWERPC_BASIC_ASM_H |
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#include <ppc-asm.h> |
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#include <asm/unistd.h> |
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#define LOAD_REG_IMMEDIATE(reg, expr) \ |
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lis reg, (expr)@highest; \ |
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ori reg, reg, (expr)@higher; \ |
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rldicr reg, reg, 32, 31; \ |
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oris reg, reg, (expr)@high; \ |
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ori reg, reg, (expr)@l; |
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/* |
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* Note: These macros assume that variables being stored on the stack are |
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* doublewords, while this is usually the case it may not always be the |
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* case for each use case. |
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*/ |
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#if defined(_CALL_ELF) && _CALL_ELF == 2 |
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#define STACK_FRAME_MIN_SIZE 32 |
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#define STACK_FRAME_TOC_POS 24 |
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#define __STACK_FRAME_PARAM(_param) (32 + ((_param)*8)) |
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#define __STACK_FRAME_LOCAL(_num_params, _var_num) \ |
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((STACK_FRAME_PARAM(_num_params)) + ((_var_num)*8)) |
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#else |
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#define STACK_FRAME_MIN_SIZE 112 |
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#define STACK_FRAME_TOC_POS 40 |
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#define __STACK_FRAME_PARAM(i) (48 + ((i)*8)) |
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/* |
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* Caveat: if a function passed more than 8 doublewords, the caller will have |
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* made more space... which would render the 112 incorrect. |
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*/ |
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#define __STACK_FRAME_LOCAL(_num_params, _var_num) \ |
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(112 + ((_var_num)*8)) |
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#endif |
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/* Parameter x saved to the stack */ |
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#define STACK_FRAME_PARAM(var) __STACK_FRAME_PARAM(var) |
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/* Local variable x saved to the stack after x parameters */ |
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#define STACK_FRAME_LOCAL(num_params, var) \ |
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__STACK_FRAME_LOCAL(num_params, var) |
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#define STACK_FRAME_LR_POS 16 |
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#define STACK_FRAME_CR_POS 8 |
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/* |
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* It is very important to note here that _extra is the extra amount of |
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* stack space needed. This space can be accessed using STACK_FRAME_PARAM() |
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* or STACK_FRAME_LOCAL() macros. |
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* |
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* r1 and r2 are not defined in ppc-asm.h (instead they are defined as sp |
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* and toc). Kernel programmers tend to prefer rX even for r1 and r2, hence |
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* %1 and %r2. r0 is defined in ppc-asm.h and therefore %r0 gets |
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* preprocessed incorrectly, hence r0. |
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*/ |
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#define PUSH_BASIC_STACK(_extra) \ |
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mflr r0; \ |
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std r0, STACK_FRAME_LR_POS(%r1); \ |
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stdu %r1, -(_extra + STACK_FRAME_MIN_SIZE)(%r1); \ |
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mfcr r0; \ |
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stw r0, STACK_FRAME_CR_POS(%r1); \ |
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std %r2, STACK_FRAME_TOC_POS(%r1); |
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#define POP_BASIC_STACK(_extra) \ |
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ld %r2, STACK_FRAME_TOC_POS(%r1); \ |
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lwz r0, STACK_FRAME_CR_POS(%r1); \ |
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mtcr r0; \ |
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addi %r1, %r1, (_extra + STACK_FRAME_MIN_SIZE); \ |
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ld r0, STACK_FRAME_LR_POS(%r1); \ |
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mtlr r0; |
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#endif /* _SELFTESTS_POWERPC_BASIC_ASM_H */
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