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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/testing/selftests/powerpc/include/basic_asm.h | |
parent | Initial commit. (diff) | |
download | linux-430c2fc249ea5c0536abd21c23382884005c9093.tar.xz linux-430c2fc249ea5c0536abd21c23382884005c9093.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/testing/selftests/powerpc/include/basic_asm.h')
-rw-r--r-- | tools/testing/selftests/powerpc/include/basic_asm.h | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/tools/testing/selftests/powerpc/include/basic_asm.h b/tools/testing/selftests/powerpc/include/basic_asm.h new file mode 100644 index 000000000..886dc026f --- /dev/null +++ b/tools/testing/selftests/powerpc/include/basic_asm.h @@ -0,0 +1,74 @@ +/* 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 */ |