75 lines
2.3 KiB
C
75 lines
2.3 KiB
C
|
/* 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>
|
||
|
|
|
||
|
|
#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 */
|