1 #ifndef _SELFTESTS_POWERPC_BASIC_ASM_H 2 #define _SELFTESTS_POWERPC_BASIC_ASM_H 3 4 #include <ppc-asm.h> 5 #include <asm/unistd.h> 6 7 #define LOAD_REG_IMMEDIATE(reg, expr) \ 8 lis reg, (expr)@highest; \ 9 ori reg, reg, (expr)@higher; \ 10 rldicr reg, reg, 32, 31; \ 11 oris reg, reg, (expr)@high; \ 12 ori reg, reg, (expr)@l; 13 14 /* 15 * Note: These macros assume that variables being stored on the stack are 16 * doublewords, while this is usually the case it may not always be the 17 * case for each use case. 18 */ 19 #if defined(_CALL_ELF) && _CALL_ELF == 2 20 #define STACK_FRAME_MIN_SIZE 32 21 #define STACK_FRAME_TOC_POS 24 22 #define __STACK_FRAME_PARAM(_param) (32 + ((_param)*8)) 23 #define __STACK_FRAME_LOCAL(_num_params, _var_num) \ 24 ((STACK_FRAME_PARAM(_num_params)) + ((_var_num)*8)) 25 #else 26 #define STACK_FRAME_MIN_SIZE 112 27 #define STACK_FRAME_TOC_POS 40 28 #define __STACK_FRAME_PARAM(i) (48 + ((i)*8)) 29 30 /* 31 * Caveat: if a function passed more than 8 doublewords, the caller will have 32 * made more space... which would render the 112 incorrect. 33 */ 34 #define __STACK_FRAME_LOCAL(_num_params, _var_num) \ 35 (112 + ((_var_num)*8)) 36 #endif 37 38 /* Parameter x saved to the stack */ 39 #define STACK_FRAME_PARAM(var) __STACK_FRAME_PARAM(var) 40 41 /* Local variable x saved to the stack after x parameters */ 42 #define STACK_FRAME_LOCAL(num_params, var) \ 43 __STACK_FRAME_LOCAL(num_params, var) 44 #define STACK_FRAME_LR_POS 16 45 #define STACK_FRAME_CR_POS 8 46 47 /* 48 * It is very important to note here that _extra is the extra amount of 49 * stack space needed. This space can be accessed using STACK_FRAME_PARAM() 50 * or STACK_FRAME_LOCAL() macros. 51 * 52 * r1 and r2 are not defined in ppc-asm.h (instead they are defined as sp 53 * and toc). Kernel programmers tend to prefer rX even for r1 and r2, hence 54 * %1 and %r2. r0 is defined in ppc-asm.h and therefore %r0 gets 55 * preprocessed incorrectly, hence r0. 56 */ 57 #define PUSH_BASIC_STACK(_extra) \ 58 mflr r0; \ 59 std r0, STACK_FRAME_LR_POS(%r1); \ 60 stdu %r1, -(_extra + STACK_FRAME_MIN_SIZE)(%r1); \ 61 mfcr r0; \ 62 stw r0, STACK_FRAME_CR_POS(%r1); \ 63 std %r2, STACK_FRAME_TOC_POS(%r1); 64 65 #define POP_BASIC_STACK(_extra) \ 66 ld %r2, STACK_FRAME_TOC_POS(%r1); \ 67 lwz r0, STACK_FRAME_CR_POS(%r1); \ 68 mtcr r0; \ 69 addi %r1, %r1, (_extra + STACK_FRAME_MIN_SIZE); \ 70 ld r0, STACK_FRAME_LR_POS(%r1); \ 71 mtlr r0; 72 73 #endif /* _SELFTESTS_POWERPC_BASIC_ASM_H */ 74