include/asm/head-64.h

1 /* SPDX-License-Identifier: GPL-2.0 */
23  * Fixed (location) sections are used by opening fixed sections and emitting
24  * fixed section entries into them before closing them. Multiple fixed sections
27  * Each fixed section created in a .S file must have corresponding linkage
30  * For each fixed section, code is generated into it in the order which it
31  * appears in the source.  Fixed section entries can be placed at a fixed
43  * FIXED_SECTION_ENTRY_BEGIN_LOCATION(section_name, label2, start_address, size)
44  * FIXED_SECTION_ENTRY_END_LOCATION(section_name, label2, start_address, size)
50  * - If the build dies with "Error: attempt to move .org backwards" at
54  * - If the build dies in linking, check arch/powerpc/tools/head_check.sh
56  * - If the kernel crashes or hangs in very early boot, it could be linker
63 	sname##_len = (end) - (start);				\
95 	sname##_len = (end) - (start);				\
121 #define FIXED_SECTION_ENTRY_BEGIN_LOCATION(sname, name, start, size) \
124 	.if ((start) % (size) != 0);				\
125 	.error "Fixed section exception vector misalignment";	\
127 	.if ((size) != 0x20) && ((size) != 0x80) && ((size) != 0x100) && ((size) != 0x1000); \
128 	.error "Fixed section exception vector bad size";	\
131 	.error "Fixed section underflow";			\
134 	. = (start) - sname##_start;				\
138 #define FIXED_SECTION_ENTRY_END_LOCATION(sname, name, start, size) \
139 	.if (start) + (size) > sname##_end;			\
140 	.error "Fixed section overflow";			\
143 	.if (. - name > (start) + (size) - name##_start);	\
144 	.error "Fixed entry overflow";				\
147 	. = ((start) + (size) - sname##_start);			\
151  * These macros are used to change symbols in other fixed sections to be
152  * absolute or related to our current fixed section.
154  * - DEFINE_FIXED_SYMBOL / FIXED_SYMBOL_ABS_ADDR is used to find the
155  *   absolute address of a symbol within a fixed section, from any section.
157  * - ABS_ADDR is used to find the absolute address of any symbol, from within
158  *   a fixed section.
162 	label##_absolute = (label - start_ ## sname + sname ## _start)
168 #define ABS_ADDR(label, sname) (label - start_ ## sname + sname ## _start)