/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _SELFTESTS_POWERPC_BASIC_ASM_H
#define _SELFTESTS_POWERPC_BASIC_ASM_H
#include <ppc-asm.h>
#include <asm/unistd.h>
#ifdef __powerpc64__
#define PPC_LL ld
#define PPC_STL std
#define PPC_STLU stdu
#else
#define PPC_LL lwz
#define PPC_STL stw
#define PPC_STLU stwu
#endif
#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
* sizeof(long), while this is usually the case it may not always be the
* case for each use case.
*/
#ifdef __powerpc64__
// ABIv2
#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 // ABIv1 below
#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 // ABIv2
// Common 64-bit
#define STACK_FRAME_LR_POS 16
#define STACK_FRAME_CR_POS 8
#else // 32-bit below
#define STACK_FRAME_MIN_SIZE 16
#define STACK_FRAME_LR_POS 4
#define __STACK_FRAME_PARAM(_param) (STACK_FRAME_MIN_SIZE + ((_param)*4))
#define __STACK_FRAME_LOCAL(_num_params, _var_num) \
((STACK_FRAME_PARAM(_num_params)) + ((_var_num)*4))
#endif // __powerpc64__
/* 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)
/*
* 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; \
PPC_STL r0, STACK_FRAME_LR_POS(%r1); \
PPC_STLU %r1, -(((_extra + 15) & ~15) + STACK_FRAME_MIN_SIZE)(%r1);
#define POP_BASIC_STACK(_extra) \
addi %r1, %r1, (((_extra + 15) & ~15) + STACK_FRAME_MIN_SIZE); \
PPC_LL r0, STACK_FRAME_LR_POS(%r1); \
mtlr r0;
.macro OP_REGS op, reg_width, start_reg, end_reg, base_reg, base_reg_offset=0, skip=0
.set i, \start_reg
.rept (\end_reg - \start_reg + 1)
\op i, (\reg_width * (i - \skip) + \base_reg_offset)(\base_reg)
.set i, i + 1
.endr
.endm
#endif /* _SELFTESTS_POWERPC_BASIC_ASM_H */
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