8869020ae2
In a two segment binary was previously trying to use MAXPAGESIZE set to 4 to cram the sections in very tight for embedded. This seemed to with this toolchain cause the linker to get confused and sometimes appear to stuff in an extra 4 bytes in the output file, thus misaligning the data segment. It's possible it's still a bug on my side in the linker, but setting max_page_size to 8 seems to work around it for now. Possible there's some implicit 64bit aligning slipped in a stage somewhere in binutils thats causing it to get confused. Either way, 8 byte alignment is no large loss here.
96 lines
2.2 KiB
Plaintext
96 lines
2.2 KiB
Plaintext
OUTPUT_FORMAT("elf%BITS%-littleriscv")
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/*
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* LK linker script for single segment binaries.
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*/
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PHDRS
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{
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code PT_LOAD FLAGS(5); /* PF_R|PF_X */
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rodata PT_LOAD FLAGS(4); /* PF_R */
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data PT_LOAD FLAGS(6); /* PF_R|PF_W */
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}
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ENTRY(_start)
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SECTIONS
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{
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. = %KERNEL_BASE% + %KERNEL_LOAD_OFFSET%;
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_start = .;
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__rom_start = .;
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/* text/read-only data */
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/* set the load address to physical MEMBASE */
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.text : AT(%MEMBASE% + %KERNEL_LOAD_OFFSET%) {
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KEEP(*(.text.boot))
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*(.text .text*)
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*(.gnu.linkonce.t.*)
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} :code
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. = ALIGN(CONSTANT(MAXPAGESIZE));
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.rodata : {
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__rodata_start = .;
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*(.rodata .rodata.* .gnu.linkonce.r.*)
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} :rodata
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/* trick to force any extra sections to be emitted here */
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. = .;
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__rodata_end = .;
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__rom_end = . ;
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. = ALIGN(CONSTANT(MAXPAGESIZE));
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__data_start_rom = .;
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.data : {
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__data_start = .;
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*(.data .data.* .gnu.linkonce.d.*)
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__ctor_list = .;
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KEEP(*(.ctors .init_array))
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__ctor_end = .;
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__dtor_list = .;
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KEEP(*(.dtors .fini_array))
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__dtor_end = .;
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*(.got*)
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*(.dynamic)
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} :data
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/* Try to put sdata and sbss near each other by putting sdata at the end of the data segment
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* and sbss at the start of the bss segment. This maximizes reach of things referenced off of
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* the global pointer. */
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.sdata : {
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__global_pointer$ = . + (4K / 2);
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*(.srodata.cst16) *(.srodata.cst8) *(.srodata.cst4) *(.srodata.cst2) *(.srodata .srodata.*)
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*(.sdata .sdata.* .gnu.linkonce.s.*)
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}
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. = ALIGN(%BITS% / 8);
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__data_end = .;
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__bss_start = .;
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.sbss : {
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*(.dynsbss)
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*(.sbss .sbss.* .gnu.linkonce.sb.*)
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*(.scommon)
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}
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/* uninitialized data (in same segment as writable data) */
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.bss : {
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/* regular bss */
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*(.bss .bss.*)
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*(.gnu.linkonce.b.*)
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}
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. = ALIGN(%BITS% / 8);
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__bss_end = .;
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/* Align the end to ensure anything after the kernel ends up on its own pages */
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. = ALIGN(CONSTANT(MAXPAGESIZE));
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_end = .;
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. = %KERNEL_BASE% + %MEMSIZE%;
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_end_of_ram = .;
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/* Strip unnecessary stuff */
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/DISCARD/ : { *(.comment .note .eh_frame) }
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}
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