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) ((STACK_FRAME_PARAM(_num_params)) + ((_var_num)*8)) 24 #else 25 #define STACK_FRAME_MIN_SIZE 112 26 #define STACK_FRAME_TOC_POS 40 27 #define __STACK_FRAME_PARAM(i) (48 + ((i)*8)) 28 29 /* 30 * Caveat: if a function passed more than 8 doublewords, the caller will have 31 * made more space... which would render the 112 incorrect. 32 */ 33 #define __STACK_FRAME_LOCAL(_num_params,_var_num) (112 + ((_var_num)*8)) 34 #endif 35 36 /* Parameter x saved to the stack */ 37 #define STACK_FRAME_PARAM(var) __STACK_FRAME_PARAM(var) 38 39 /* Local variable x saved to the stack after x parameters */ 40 #define STACK_FRAME_LOCAL(num_params,var) __STACK_FRAME_LOCAL(num_params,var) 41 #define STACK_FRAME_LR_POS 16 42 #define STACK_FRAME_CR_POS 8 43 44 /* 45 * It is very important to note here that _extra is the extra amount of 46 * stack space needed. This space can be accessed using STACK_FRAME_PARAM() 47 * or STACK_FRAME_LOCAL() macros. 48 * 49 * r1 and r2 are not defined in ppc-asm.h (instead they are defined as sp 50 * and toc). Kernel programmers tend to prefer rX even for r1 and r2, hence 51 * %1 and %r2. r0 is defined in ppc-asm.h and therefore %r0 gets 52 * preprocessed incorrectly, hence r0. 53 */ 54 #define PUSH_BASIC_STACK(_extra) \ 55 mflr r0; \ 56 std r0,STACK_FRAME_LR_POS(%r1); \ 57 stdu %r1,-(_extra + STACK_FRAME_MIN_SIZE)(%r1); \ 58 mfcr r0; \ 59 stw r0,STACK_FRAME_CR_POS(%r1); \ 60 std %r2,STACK_FRAME_TOC_POS(%r1); 61 62 #define POP_BASIC_STACK(_extra) \ 63 ld %r2,STACK_FRAME_TOC_POS(%r1); \ 64 lwz r0,STACK_FRAME_CR_POS(%r1); \ 65 mtcr r0; \ 66 addi %r1,%r1,(_extra + STACK_FRAME_MIN_SIZE); \ 67 ld r0,STACK_FRAME_LR_POS(%r1); \ 68 mtlr r0; 69 70 #endif /* _SELFTESTS_POWERPC_BASIC_ASM_H */ 71