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https://github.com/ibm-s390-linux/s390-tools.git
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19f747847f
Use C pre-processor for linker script generation and refactor some constants. This allows the usage of the constants in our "linker scripts" `*.lds.S` (actually, these are assembler files, so we can make us of the C pre-processor and its capabilities). While at it, enforce the described memory layout in the generated linker script. Reviewed-by: Stefan Haberland <sth@linux.ibm.com> Reviewed-by: Philipp Rudo <prudo@linux.ibm.com> Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com> Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
94 lines
2.3 KiB
ArmAsm
94 lines
2.3 KiB
ArmAsm
/*
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* Memory layout for stage 2
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* =========================
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*
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* General memory layout
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* ---------------------
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*
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* 0x0000-0x1fff Lowcore
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* 0x2000-0x4fff Sections (load): head, text, data, rodata, rodata.str
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* 0x5000-0x51ff eckd2dump_mv parameter block (426 bytes)
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* 0x5200-0x5fff Sections: bss
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* 0x6000-0x8fff Memory allocation (heap)
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* 0x9000-0x9fff Memory to load stage3 parameter to
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* 0xa000-0xdfff Memory to load stage3 to
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* 0xe000-0xe3ff command line extra
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* 0xe400-0xffff Stack
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*
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* Special memory locations
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* ------------------------
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*
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* 0x78 Stage 2 description parameters
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* 0x2018 Stage 2 entry point
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* 0x3ff7 eckd2dump_mv force parameter
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* 0x3ff8 Max mem dump parameter
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* 0x5000-0x51ff eckd2dump_mv parameter block (426 bytes)
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*/
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#include "boot/loaders_layout.h"
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SECTIONS
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{
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. = STAGE2_DESC;
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__stage2_desc = .;
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. = STAGE2_LOAD_ADDRESS;
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.stage2.head : { *(.stage2.head) }
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. = STAGE2_ENTRY;
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.text.start : {
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*(.text.start)
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}
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.text : { *(.text) }
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__ex_table_start = .;
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.ex_table : { *(.ex_table) }
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__ex_table_stop = .;
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.rodata : {*(.rodata) }
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.data : { *(.data) }
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__stage2_params = .;
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. = 0x4ff0;
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.stage2dump.tail : { *(.stage2dump.tail) }
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. = 0x5000;
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.eckd2dump_mv.tail : { *(.eckd2dump_mv.tail) }
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. = 0x5200;
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__bss_start = .;
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.bss : { *(.bss) }
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__bss_stop = .;
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. = STAGE2_HEAP_ADDRESS;
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__heap_start = .;
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.heap : {
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. += STAGE2_HEAP_SIZE;
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ASSERT(__heap_stop - __heap_start == STAGE2_HEAP_SIZE,
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"Heap section doesn't conform to the described memory layout");
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}
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__heap_stop = .;
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/* Memory reserved for stage3. Use a dummy section to check if changes
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* in stage3 memory layout work with stage2 and vice versa.
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*/
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. = STAGE3_PARAMS_ADDRESS;
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.stage3 : {
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. += STAGE3_PARAMS_MAXIMUM_SIZE;
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. = STAGE3_LOAD_ADDRESS - STAGE3_PARAMS_ADDRESS;
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. += STAGE3_MAXIMUM_SIZE;
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. = COMMAND_LINE_EXTRA - STAGE3_PARAMS_ADDRESS;
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. += COMMAND_LINE_EXTRA_SIZE;
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}
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. = STAGE2_STACK_ADDRESS;
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__stack_start = .;
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.stack : {
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. += STAGE2_STACK_SIZE;
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ASSERT(__stack_end - __stack_start == STAGE2_STACK_SIZE,
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"Stack section doesn't conform to the described memory layout");
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}
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__stack_end = .;
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.eh_frame : { *(.eh_frame) }
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.note.gnu.build-id : { *(.note.gnu.build-id) }
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}
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