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improve linker scripts

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Previously, due to the ordering of .text.p2ram and .bss, the linker
was forced to allocate .bss in the output file, increasing the size
of the final binary unnecessarily.

The linker scripts now preserve debugging symbols during linking.
This commit is contained in:
Zack Buhman 2023-12-23 22:03:15 +08:00
parent b484b5d4fe
commit 3a48e2bfd7
3 changed files with 76 additions and 38 deletions
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30
alt.lds
View File

@ -33,35 +33,29 @@ SECTIONS
KEEP(*(.ctors.*))
} > p1ram
.bss ALIGN(4) (NOLOAD) : SUBALIGN(4)
{
*(.bss)
*(.bss.*)
} > p1ram
.text.p2ram ALIGN(4) : SUBALIGN(4)
{
*(.p2ram)
*(.p2ram.*)
} > p1ram
__p1ram_end = .;
/DISCARD/ :
.bss ALIGN(4) (NOLOAD) : SUBALIGN(4)
{
*(.debug*)
*(.comment*)
*(.rela*)
}
*(.bss)
*(.bss.*)
*(COMMON)
} > p1ram
__bss_link_start = ADDR(.bss);
__bss_link_end = ADDR(.bss) + SIZEOF(.bss);
__ctors_link_start = ADDR(.ctors);
__ctors_link_end = ADDR(.ctors) + SIZEOF(.ctors);
INCLUDE "debug.lds"
}
__p1ram_start = ORIGIN(p1ram);
__p1ram_end = ORIGIN(p1ram) + LENGTH(p1ram);
__bss_link_start = ADDR(.bss);
__bss_link_end = ADDR(.bss) + SIZEOF(.bss);
__ctors_link_start = ADDR(.ctors);
__ctors_link_end = ADDR(.ctors) + SIZEOF(.ctors);
INCLUDE "addresses.lds"

48
debug.lds Normal file
View File

@ -0,0 +1,48 @@
/* Stabs debugging sections. */
.stab 0 : { *(.stab) }
.stabstr 0 : { *(.stabstr) }
.stab.excl 0 : { *(.stab.excl) }
.stab.exclstr 0 : { *(.stab.exclstr) }
.stab.index 0 : { *(.stab.index) }
.stab.indexstr 0 : { *(.stab.indexstr) }
.comment 0 : { *(.comment) }
.gnu.build.attributes : { *(.gnu.build.attributes .gnu.build.attributes.*) }
/* DWARF debug sections.
Symbols in the DWARF debugging sections are relative to the beginning
of the section so we begin them at 0. */
/* DWARF 1. */
.debug 0 : { *(.debug) }
.line 0 : { *(.line) }
/* GNU DWARF 1 extensions. */
.debug_srcinfo 0 : { *(.debug_srcinfo) }
.debug_sfnames 0 : { *(.debug_sfnames) }
/* DWARF 1.1 and DWARF 2. */
.debug_aranges 0 : { *(.debug_aranges) }
.debug_pubnames 0 : { *(.debug_pubnames) }
/* DWARF 2. */
.debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) }
.debug_abbrev 0 : { *(.debug_abbrev) }
.debug_line 0 : { *(.debug_line .debug_line.* .debug_line_end) }
.debug_frame 0 : { *(.debug_frame) }
.debug_str 0 : { *(.debug_str) }
.debug_loc 0 : { *(.debug_loc) }
.debug_macinfo 0 : { *(.debug_macinfo) }
/* SGI/MIPS DWARF 2 extensions. */
.debug_weaknames 0 : { *(.debug_weaknames) }
.debug_funcnames 0 : { *(.debug_funcnames) }
.debug_typenames 0 : { *(.debug_typenames) }
.debug_varnames 0 : { *(.debug_varnames) }
/* DWARF 3. */
.debug_pubtypes 0 : { *(.debug_pubtypes) }
.debug_ranges 0 : { *(.debug_ranges) }
/* DWARF 5. */
.debug_addr 0 : { *(.debug_addr) }
.debug_line_str 0 : { *(.debug_line_str) }
.debug_loclists 0 : { *(.debug_loclists) }
.debug_macro 0 : { *(.debug_macro) }
.debug_names 0 : { *(.debug_names) }
.debug_rnglists 0 : { *(.debug_rnglists) }
.debug_str_offsets 0 : { *(.debug_str_offsets) }
.debug_sup 0 : { *(.debug_sup) }
.gnu.attributes 0 : { KEEP (*(.gnu.attributes)) }
/DISCARD/ : { *(.note.GNU-stack) *(.gnu_debuglink) *(.gnu.lto_*) *(.rela.*) }

36
main.lds
View File

@ -6,7 +6,7 @@ MEMORY
}
SECTIONS
{
. = 0x8c010000;
. = ORIGIN(p1ram);
.text ALIGN(4) : SUBALIGN(4)
{
@ -34,15 +34,7 @@ SECTIONS
KEEP(*(.ctors.*))
} > p1ram
.bss ALIGN(4) (NOLOAD) : SUBALIGN(4)
{
*(.bss)
*(.bss.*)
} > p1ram
__p1ram_end = .;
. = 0xac010000 + __p1ram_end - __p1ram_start;
. = ORIGIN(p2ram) + (. - ORIGIN(p1ram));
.text.p2ram ALIGN(4) : SUBALIGN(4)
{
@ -50,21 +42,25 @@ SECTIONS
*(.p2ram.*)
} > p2ram AT>p1ram
/DISCARD/ :
. = ORIGIN(p1ram) + (. - ORIGIN(p2ram));
.bss ALIGN(4) (NOLOAD) : SUBALIGN(4)
{
*(.debug*)
*(.comment*)
*(.rela*)
}
*(.bss)
*(.bss.*)
*(COMMON)
} > p1ram
__bss_link_start = ADDR(.bss);
__bss_link_end = ADDR(.bss) + SIZEOF(.bss);
__ctors_link_start = ADDR(.ctors);
__ctors_link_end = ADDR(.ctors) + SIZEOF(.ctors);
INCLUDE "debug.ld"
}
__p1ram_start = ORIGIN(p1ram);
__p1ram_end = ORIGIN(p1ram) + LENGTH(p1ram);
__bss_link_start = ADDR(.bss);
__bss_link_end = ADDR(.bss) + SIZEOF(.bss);
__ctors_link_start = ADDR(.ctors);
__ctors_link_end = ADDR(.ctors) + SIZEOF(.ctors);
INCLUDE "addresses.lds"