75 lines
2.3 KiB
C
75 lines
2.3 KiB
C
/* 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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