%PDF- %PDF-
Direktori : /usr/lib/modules/6.8.0-41-generic/build/arch/powerpc/include/asm/ |
Current File : //usr/lib/modules/6.8.0-41-generic/build/arch/powerpc/include/asm/head-64.h |
/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_POWERPC_HEAD_64_H #define _ASM_POWERPC_HEAD_64_H #include <asm/cache.h> #ifdef __ASSEMBLY__ /* * We can't do CPP stringification and concatination directly into the section * name for some reason, so these macros can do it for us. */ .macro define_ftsec name .section ".head.text.\name\()","ax",@progbits .endm .macro define_data_ftsec name .section ".head.data.\name\()","a",@progbits .endm .macro use_ftsec name .section ".head.text.\name\()","ax",@progbits .endm /* * Fixed (location) sections are used by opening fixed sections and emitting * fixed section entries into them before closing them. Multiple fixed sections * can be open at any time. * * Each fixed section created in a .S file must have corresponding linkage * directives including location, added to arch/powerpc/kernel/vmlinux.lds.S * * For each fixed section, code is generated into it in the order which it * appears in the source. Fixed section entries can be placed at a fixed * location within the section using _LOCATION postifx variants. These must * be ordered according to their relative placements within the section. * * OPEN_FIXED_SECTION(section_name, start_address, end_address) * FIXED_SECTION_ENTRY_BEGIN(section_name, label1) * * USE_FIXED_SECTION(section_name) * label3: * li r10,128 * mv r11,r10 * FIXED_SECTION_ENTRY_BEGIN_LOCATION(section_name, label2, start_address, size) * FIXED_SECTION_ENTRY_END_LOCATION(section_name, label2, start_address, size) * CLOSE_FIXED_SECTION(section_name) * * ZERO_FIXED_SECTION can be used to emit zeroed data. * * Troubleshooting: * - If the build dies with "Error: attempt to move .org backwards" at * CLOSE_FIXED_SECTION() or elsewhere, there may be something * unexpected being added there. Remove the '. = x_len' line, rebuild, and * check what is pushing the section down. * - If the build dies in linking, check arch/powerpc/tools/head_check.sh * comments. * - If the kernel crashes or hangs in very early boot, it could be linker * stubs at the start of the main text. */ #define OPEN_FIXED_SECTION(sname, start, end) \ sname##_start = (start); \ sname##_end = (end); \ sname##_len = (end) - (start); \ define_ftsec sname; \ . = 0x0; \ start_##sname: /* * .linker_stub_catch section is used to catch linker stubs from being * inserted in our .text section, above the start_text label (which breaks * the ABS_ADDR calculation). See kernel/vmlinux.lds.S and tools/head_check.sh * for more details. We would prefer to just keep a cacheline (0x80), but * 0x100 seems to be how the linker aligns branch stub groups. */ #ifdef CONFIG_LD_HEAD_STUB_CATCH #define OPEN_TEXT_SECTION(start) \ .section ".linker_stub_catch","ax",@progbits; \ linker_stub_catch: \ . = 0x4; \ text_start = (start) + 0x100; \ .section ".text","ax",@progbits; \ .balign 0x100; \ start_text: #else #define OPEN_TEXT_SECTION(start) \ text_start = (start); \ .section ".text","ax",@progbits; \ . = 0x0; \ start_text: #endif #define ZERO_FIXED_SECTION(sname, start, end) \ sname##_start = (start); \ sname##_end = (end); \ sname##_len = (end) - (start); \ define_data_ftsec sname; \ . = 0x0; \ . = sname##_len; #define USE_FIXED_SECTION(sname) \ use_ftsec sname; #define USE_TEXT_SECTION() \ .text #define CLOSE_FIXED_SECTION(sname) \ USE_FIXED_SECTION(sname); \ . = sname##_len; \ end_##sname: #define __FIXED_SECTION_ENTRY_BEGIN(sname, name, __align) \ USE_FIXED_SECTION(sname); \ .balign __align; \ .global name; \ name: #define FIXED_SECTION_ENTRY_BEGIN(sname, name) \ __FIXED_SECTION_ENTRY_BEGIN(sname, name, IFETCH_ALIGN_BYTES) #define FIXED_SECTION_ENTRY_BEGIN_LOCATION(sname, name, start, size) \ USE_FIXED_SECTION(sname); \ name##_start = (start); \ .if ((start) % (size) != 0); \ .error "Fixed section exception vector misalignment"; \ .endif; \ .if ((size) != 0x20) && ((size) != 0x80) && ((size) != 0x100) && ((size) != 0x1000); \ .error "Fixed section exception vector bad size"; \ .endif; \ .if (start) < sname##_start; \ .error "Fixed section underflow"; \ .abort; \ .endif; \ . = (start) - sname##_start; \ .global name; \ name: #define FIXED_SECTION_ENTRY_END_LOCATION(sname, name, start, size) \ .if (start) + (size) > sname##_end; \ .error "Fixed section overflow"; \ .abort; \ .endif; \ .if (. - name > (start) + (size) - name##_start); \ .error "Fixed entry overflow"; \ .abort; \ .endif; \ . = ((start) + (size) - sname##_start); \ /* * These macros are used to change symbols in other fixed sections to be * absolute or related to our current fixed section. * * - DEFINE_FIXED_SYMBOL / FIXED_SYMBOL_ABS_ADDR is used to find the * absolute address of a symbol within a fixed section, from any section. * * - ABS_ADDR is used to find the absolute address of any symbol, from within * a fixed section. */ // define label as being _in_ sname #define DEFINE_FIXED_SYMBOL(label, sname) \ label##_absolute = (label - start_ ## sname + sname ## _start) #define FIXED_SYMBOL_ABS_ADDR(label) \ (label##_absolute) // find label from _within_ sname #define ABS_ADDR(label, sname) (label - start_ ## sname + sname ## _start) #endif /* __ASSEMBLY__ */ #endif /* _ASM_POWERPC_HEAD_64_H */