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1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef _SELFTESTS_POWERPC_BASIC_ASM_H3#define _SELFTESTS_POWERPC_BASIC_ASM_H4 5#include <ppc-asm.h>6#include <asm/unistd.h>7 8#ifdef __powerpc64__9#define PPC_LL ld10#define PPC_STL std11#define PPC_STLU stdu12#else13#define PPC_LL lwz14#define PPC_STL stw15#define PPC_STLU stwu16#endif17 18#define LOAD_REG_IMMEDIATE(reg, expr) \19 lis reg, (expr)@highest; \20 ori reg, reg, (expr)@higher; \21 rldicr reg, reg, 32, 31; \22 oris reg, reg, (expr)@high; \23 ori reg, reg, (expr)@l;24 25/*26 * Note: These macros assume that variables being stored on the stack are27 * sizeof(long), while this is usually the case it may not always be the28 * case for each use case.29 */30#ifdef __powerpc64__31 32// ABIv233#if defined(_CALL_ELF) && _CALL_ELF == 234#define STACK_FRAME_MIN_SIZE 3235#define STACK_FRAME_TOC_POS 2436#define __STACK_FRAME_PARAM(_param) (32 + ((_param)*8))37#define __STACK_FRAME_LOCAL(_num_params, _var_num) \38 ((STACK_FRAME_PARAM(_num_params)) + ((_var_num)*8))39 40#else // ABIv1 below41#define STACK_FRAME_MIN_SIZE 11242#define STACK_FRAME_TOC_POS 4043#define __STACK_FRAME_PARAM(i) (48 + ((i)*8))44 45/*46 * Caveat: if a function passed more than 8 doublewords, the caller will have47 * made more space... which would render the 112 incorrect.48 */49#define __STACK_FRAME_LOCAL(_num_params, _var_num) \50 (112 + ((_var_num)*8))51 52 53#endif // ABIv254 55// Common 64-bit56#define STACK_FRAME_LR_POS 1657#define STACK_FRAME_CR_POS 858 59#else // 32-bit below60 61#define STACK_FRAME_MIN_SIZE 1662#define STACK_FRAME_LR_POS 463 64#define __STACK_FRAME_PARAM(_param) (STACK_FRAME_MIN_SIZE + ((_param)*4))65#define __STACK_FRAME_LOCAL(_num_params, _var_num) \66 ((STACK_FRAME_PARAM(_num_params)) + ((_var_num)*4))67 68#endif // __powerpc64__69 70/* Parameter x saved to the stack */71#define STACK_FRAME_PARAM(var) __STACK_FRAME_PARAM(var)72 73/* Local variable x saved to the stack after x parameters */74#define STACK_FRAME_LOCAL(num_params, var) \75 __STACK_FRAME_LOCAL(num_params, var)76 77/*78 * It is very important to note here that _extra is the extra amount of79 * stack space needed. This space can be accessed using STACK_FRAME_PARAM()80 * or STACK_FRAME_LOCAL() macros.81 *82 * r1 and r2 are not defined in ppc-asm.h (instead they are defined as sp83 * and toc). Kernel programmers tend to prefer rX even for r1 and r2, hence84 * %1 and %r2. r0 is defined in ppc-asm.h and therefore %r0 gets85 * preprocessed incorrectly, hence r0.86 */87#define PUSH_BASIC_STACK(_extra) \88 mflr r0; \89 PPC_STL r0, STACK_FRAME_LR_POS(%r1); \90 PPC_STLU %r1, -(((_extra + 15) & ~15) + STACK_FRAME_MIN_SIZE)(%r1);91 92#define POP_BASIC_STACK(_extra) \93 addi %r1, %r1, (((_extra + 15) & ~15) + STACK_FRAME_MIN_SIZE); \94 PPC_LL r0, STACK_FRAME_LR_POS(%r1); \95 mtlr r0;96 97.macro OP_REGS op, reg_width, start_reg, end_reg, base_reg, base_reg_offset=0, skip=098 .set i, \start_reg99 .rept (\end_reg - \start_reg + 1)100 \op i, (\reg_width * (i - \skip) + \base_reg_offset)(\base_reg)101 .set i, i + 1102 .endr103.endm104 105#endif /* _SELFTESTS_POWERPC_BASIC_ASM_H */106