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