| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| #ifndef __ASM_POWERPC_FEATURE_FIXUPS_H |
| #define __ASM_POWERPC_FEATURE_FIXUPS_H |
| |
| #include <asm/asm-const.h> |
| |
| /* |
| */ |
| |
| /* |
| * Feature section common macros |
| * |
| * Note that the entries now contain offsets between the table entry |
| * and the code rather than absolute code pointers in order to be |
| * useable with the vdso shared library. There is also an assumption |
| * that values will be negative, that is, the fixup table has to be |
| * located after the code it fixes up. |
| */ |
| #if defined(CONFIG_PPC64) && !defined(__powerpc64__) |
| /* 64 bits kernel, 32 bits code (ie. vdso32) */ |
| #define FTR_ENTRY_LONG .8byte |
| #define FTR_ENTRY_OFFSET .long 0xffffffff; .long |
| #elif defined(CONFIG_PPC64) |
| #define FTR_ENTRY_LONG .8byte |
| #define FTR_ENTRY_OFFSET .8byte |
| #else |
| #define FTR_ENTRY_LONG .long |
| #define FTR_ENTRY_OFFSET .long |
| #endif |
| |
| #define START_FTR_SECTION(label) label##1: |
| |
| #define FTR_SECTION_ELSE_NESTED(label) \ |
| label##2: \ |
| .pushsection __ftr_alt_##label,"a"; \ |
| .align 2; \ |
| label##3: |
| |
| |
| #ifndef CONFIG_CC_IS_CLANG |
| #define CHECK_ALT_SIZE(else_size, body_size) \ |
| .ifgt (else_size) - (body_size); \ |
| .error "Feature section else case larger than body"; \ |
| .endif; |
| #else |
| /* |
| * If we use the ifgt syntax above, clang's assembler complains about the |
| * expression being non-absolute when the code appears in an inline assembly |
| * statement. |
| * As a workaround use an .org directive that has no effect if the else case |
| * instructions are smaller than the body, but fails otherwise. |
| */ |
| #define CHECK_ALT_SIZE(else_size, body_size) \ |
| .org . + ((else_size) > (body_size)); |
| #endif |
| |
| #define MAKE_FTR_SECTION_ENTRY(msk, val, label, sect) \ |
| label##4: \ |
| .popsection; \ |
| .pushsection sect,"a"; \ |
| .align 3; \ |
| label##5: \ |
| FTR_ENTRY_LONG msk; \ |
| FTR_ENTRY_LONG val; \ |
| FTR_ENTRY_OFFSET label##1b-label##5b; \ |
| FTR_ENTRY_OFFSET label##2b-label##5b; \ |
| FTR_ENTRY_OFFSET label##3b-label##5b; \ |
| FTR_ENTRY_OFFSET label##4b-label##5b; \ |
| CHECK_ALT_SIZE((label##4b-label##3b), (label##2b-label##1b)); \ |
| .popsection; |
| |
| |
| /* CPU feature dependent sections */ |
| #define BEGIN_FTR_SECTION_NESTED(label) START_FTR_SECTION(label) |
| #define BEGIN_FTR_SECTION START_FTR_SECTION(97) |
| |
| #define END_FTR_SECTION_NESTED(msk, val, label) \ |
| FTR_SECTION_ELSE_NESTED(label) \ |
| MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup) |
| |
| #define END_FTR_SECTION(msk, val) \ |
| END_FTR_SECTION_NESTED(msk, val, 97) |
| |
| #define END_FTR_SECTION_NESTED_IFSET(msk, label) \ |
| END_FTR_SECTION_NESTED((msk), (msk), label) |
| |
| #define END_FTR_SECTION_IFSET(msk) END_FTR_SECTION((msk), (msk)) |
| #define END_FTR_SECTION_IFCLR(msk) END_FTR_SECTION((msk), 0) |
| |
| /* CPU feature sections with alternatives, use BEGIN_FTR_SECTION to start */ |
| #define FTR_SECTION_ELSE FTR_SECTION_ELSE_NESTED(97) |
| #define ALT_FTR_SECTION_END_NESTED(msk, val, label) \ |
| MAKE_FTR_SECTION_ENTRY(msk, val, label, __ftr_fixup) |
| #define ALT_FTR_SECTION_END_NESTED_IFSET(msk, label) \ |
| ALT_FTR_SECTION_END_NESTED(msk, msk, label) |
| #define ALT_FTR_SECTION_END_NESTED_IFCLR(msk, label) \ |
| ALT_FTR_SECTION_END_NESTED(msk, 0, label) |
| #define ALT_FTR_SECTION_END(msk, val) \ |
| ALT_FTR_SECTION_END_NESTED(msk, val, 97) |
| #define ALT_FTR_SECTION_END_IFSET(msk) \ |
| ALT_FTR_SECTION_END_NESTED_IFSET(msk, 97) |
| #define ALT_FTR_SECTION_END_IFCLR(msk) \ |
| ALT_FTR_SECTION_END_NESTED_IFCLR(msk, 97) |
| |
| /* MMU feature dependent sections */ |
| #define BEGIN_MMU_FTR_SECTION_NESTED(label) START_FTR_SECTION(label) |
| #define BEGIN_MMU_FTR_SECTION START_FTR_SECTION(97) |
| |
| #define END_MMU_FTR_SECTION_NESTED(msk, val, label) \ |
| FTR_SECTION_ELSE_NESTED(label) \ |
| MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup) |
| |
| #define END_MMU_FTR_SECTION(msk, val) \ |
| END_MMU_FTR_SECTION_NESTED(msk, val, 97) |
| |
| #define END_MMU_FTR_SECTION_NESTED_IFSET(msk, label) \ |
| END_MMU_FTR_SECTION_NESTED((msk), (msk), label) |
| |
| #define END_MMU_FTR_SECTION_NESTED_IFCLR(msk, label) \ |
| END_MMU_FTR_SECTION_NESTED((msk), 0, label) |
| |
| #define END_MMU_FTR_SECTION_IFSET(msk) END_MMU_FTR_SECTION((msk), (msk)) |
| #define END_MMU_FTR_SECTION_IFCLR(msk) END_MMU_FTR_SECTION((msk), 0) |
| |
| /* MMU feature sections with alternatives, use BEGIN_FTR_SECTION to start */ |
| #define MMU_FTR_SECTION_ELSE_NESTED(label) FTR_SECTION_ELSE_NESTED(label) |
| #define MMU_FTR_SECTION_ELSE MMU_FTR_SECTION_ELSE_NESTED(97) |
| #define ALT_MMU_FTR_SECTION_END_NESTED(msk, val, label) \ |
| MAKE_FTR_SECTION_ENTRY(msk, val, label, __mmu_ftr_fixup) |
| #define ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, label) \ |
| ALT_MMU_FTR_SECTION_END_NESTED(msk, msk, label) |
| #define ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(msk, label) \ |
| ALT_MMU_FTR_SECTION_END_NESTED(msk, 0, label) |
| #define ALT_MMU_FTR_SECTION_END(msk, val) \ |
| ALT_MMU_FTR_SECTION_END_NESTED(msk, val, 97) |
| #define ALT_MMU_FTR_SECTION_END_IFSET(msk) \ |
| ALT_MMU_FTR_SECTION_END_NESTED_IFSET(msk, 97) |
| #define ALT_MMU_FTR_SECTION_END_IFCLR(msk) \ |
| ALT_MMU_FTR_SECTION_END_NESTED_IFCLR(msk, 97) |
| |
| /* Firmware feature dependent sections */ |
| #define BEGIN_FW_FTR_SECTION_NESTED(label) START_FTR_SECTION(label) |
| #define BEGIN_FW_FTR_SECTION START_FTR_SECTION(97) |
| |
| #define END_FW_FTR_SECTION_NESTED(msk, val, label) \ |
| FTR_SECTION_ELSE_NESTED(label) \ |
| MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup) |
| |
| #define END_FW_FTR_SECTION(msk, val) \ |
| END_FW_FTR_SECTION_NESTED(msk, val, 97) |
| |
| #define END_FW_FTR_SECTION_IFSET(msk) END_FW_FTR_SECTION((msk), (msk)) |
| #define END_FW_FTR_SECTION_IFCLR(msk) END_FW_FTR_SECTION((msk), 0) |
| |
| /* Firmware feature sections with alternatives */ |
| #define FW_FTR_SECTION_ELSE_NESTED(label) FTR_SECTION_ELSE_NESTED(label) |
| #define FW_FTR_SECTION_ELSE FTR_SECTION_ELSE_NESTED(97) |
| #define ALT_FW_FTR_SECTION_END_NESTED(msk, val, label) \ |
| MAKE_FTR_SECTION_ENTRY(msk, val, label, __fw_ftr_fixup) |
| #define ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, label) \ |
| ALT_FW_FTR_SECTION_END_NESTED(msk, msk, label) |
| #define ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, label) \ |
| ALT_FW_FTR_SECTION_END_NESTED(msk, 0, label) |
| #define ALT_FW_FTR_SECTION_END(msk, val) \ |
| ALT_FW_FTR_SECTION_END_NESTED(msk, val, 97) |
| #define ALT_FW_FTR_SECTION_END_IFSET(msk) \ |
| ALT_FW_FTR_SECTION_END_NESTED_IFSET(msk, 97) |
| #define ALT_FW_FTR_SECTION_END_IFCLR(msk) \ |
| ALT_FW_FTR_SECTION_END_NESTED_IFCLR(msk, 97) |
| |
| #ifndef __ASSEMBLY__ |
| |
| #define ASM_FTR_IF(section_if, section_else, msk, val) \ |
| stringify_in_c(BEGIN_FTR_SECTION) \ |
| section_if "; " \ |
| stringify_in_c(FTR_SECTION_ELSE) \ |
| section_else "; " \ |
| stringify_in_c(ALT_FTR_SECTION_END((msk), (val))) |
| |
| #define ASM_FTR_IFSET(section_if, section_else, msk) \ |
| ASM_FTR_IF(section_if, section_else, (msk), (msk)) |
| |
| #define ASM_FTR_IFCLR(section_if, section_else, msk) \ |
| ASM_FTR_IF(section_if, section_else, (msk), 0) |
| |
| #define ASM_MMU_FTR_IF(section_if, section_else, msk, val) \ |
| stringify_in_c(BEGIN_MMU_FTR_SECTION) \ |
| section_if "; " \ |
| stringify_in_c(MMU_FTR_SECTION_ELSE) \ |
| section_else "; " \ |
| stringify_in_c(ALT_MMU_FTR_SECTION_END((msk), (val))) |
| |
| #define ASM_MMU_FTR_IFSET(section_if, section_else, msk) \ |
| ASM_MMU_FTR_IF(section_if, section_else, (msk), (msk)) |
| |
| #define ASM_MMU_FTR_IFCLR(section_if, section_else, msk) \ |
| ASM_MMU_FTR_IF(section_if, section_else, (msk), 0) |
| |
| #endif /* __ASSEMBLY__ */ |
| |
| /* LWSYNC feature sections */ |
| #define START_LWSYNC_SECTION(label) label##1: |
| #define MAKE_LWSYNC_SECTION_ENTRY(label, sect) \ |
| label##2: \ |
| .pushsection sect,"a"; \ |
| .align 2; \ |
| label##3: \ |
| FTR_ENTRY_OFFSET label##1b-label##3b; \ |
| .popsection; |
| |
| #define STF_ENTRY_BARRIER_FIXUP_SECTION \ |
| 953: \ |
| .pushsection __stf_entry_barrier_fixup,"a"; \ |
| .align 2; \ |
| 954: \ |
| FTR_ENTRY_OFFSET 953b-954b; \ |
| .popsection; |
| |
| #define STF_EXIT_BARRIER_FIXUP_SECTION \ |
| 955: \ |
| .pushsection __stf_exit_barrier_fixup,"a"; \ |
| .align 2; \ |
| 956: \ |
| FTR_ENTRY_OFFSET 955b-956b; \ |
| .popsection; |
| |
| #define UACCESS_FLUSH_FIXUP_SECTION \ |
| 959: \ |
| .pushsection __uaccess_flush_fixup,"a"; \ |
| .align 2; \ |
| 960: \ |
| FTR_ENTRY_OFFSET 959b-960b; \ |
| .popsection; |
| |
| #define ENTRY_FLUSH_FIXUP_SECTION \ |
| 957: \ |
| .pushsection __entry_flush_fixup,"a"; \ |
| .align 2; \ |
| 958: \ |
| FTR_ENTRY_OFFSET 957b-958b; \ |
| .popsection; |
| |
| #define RFI_FLUSH_FIXUP_SECTION \ |
| 951: \ |
| .pushsection __rfi_flush_fixup,"a"; \ |
| .align 2; \ |
| 952: \ |
| FTR_ENTRY_OFFSET 951b-952b; \ |
| .popsection; |
| |
| #define NOSPEC_BARRIER_FIXUP_SECTION \ |
| 953: \ |
| .pushsection __barrier_nospec_fixup,"a"; \ |
| .align 2; \ |
| 954: \ |
| FTR_ENTRY_OFFSET 953b-954b; \ |
| .popsection; |
| |
| #define START_BTB_FLUSH_SECTION \ |
| 955: \ |
| |
| #define END_BTB_FLUSH_SECTION \ |
| 956: \ |
| .pushsection __btb_flush_fixup,"a"; \ |
| .align 2; \ |
| 957: \ |
| FTR_ENTRY_OFFSET 955b-957b; \ |
| FTR_ENTRY_OFFSET 956b-957b; \ |
| .popsection; |
| |
| #ifndef __ASSEMBLY__ |
| #include <linux/types.h> |
| |
| extern long stf_barrier_fallback; |
| extern long entry_flush_fallback; |
| extern long __start___stf_entry_barrier_fixup, __stop___stf_entry_barrier_fixup; |
| extern long __start___stf_exit_barrier_fixup, __stop___stf_exit_barrier_fixup; |
| extern long __start___uaccess_flush_fixup, __stop___uaccess_flush_fixup; |
| extern long __start___entry_flush_fixup, __stop___entry_flush_fixup; |
| extern long __start___rfi_flush_fixup, __stop___rfi_flush_fixup; |
| extern long __start___barrier_nospec_fixup, __stop___barrier_nospec_fixup; |
| extern long __start__btb_flush_fixup, __stop__btb_flush_fixup; |
| |
| void apply_feature_fixups(void); |
| void setup_feature_keys(void); |
| #endif |
| |
| #endif /* __ASM_POWERPC_FEATURE_FIXUPS_H */ |
