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[kernel] Hide kernel symbols by default

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Using `-fvisibility=hidden` when building the kernel, and then
`--discard-all` when stripping it, we shave almost 100KiB off of the
resulting ELF file.

Also dropped some unused symbols from the linker script, and rearranged
the sections so that the file is able to be mapped directly into memory
instead of having each section copied.
This commit is contained in:
Justin C. Miller
2023-01-29 19:36:20 -08:00
parent e2e1696b7e
commit 5ea5978ee8
17 changed files with 126 additions and 120 deletions
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86
src/kernel/kernel.ld
View File

@@ -1,53 +1,59 @@
PHDRS
{
rodata PT_LOAD PHDRS FILEHDR FLAGS (4) /* read-only */;
text PT_LOAD ;
rwdata PT_LOAD ;
bss PT_LOAD ;
}
MEMORY
{
kernel (rwxa) : ORIGIN = 0xFFFF800000000000, LENGTH = 256M
}
ENTRY(_kernel_start.real)
SECTIONS
{
. = 0xFFFF800000000000;
.header : {
__header_start = .;
.header ORIGIN(kernel) + SIZEOF_HEADERS : {
HIDDEN(__header_start = .);
KEEP(*(.header))
__header_end = .;
}
HIDDEN(__header_end = .);
} :rodata
.text ALIGN(4096) : {
*(.text*)
KEEP(*(.isrs))
}
.data ALIGN(4096) : {
*(.data*)
.rodata : {
*(.rodata*)
}
} :rodata
.ctors : ALIGN(8) {
__ctors = .;
.ap_startup : {
*(.ap_startup*)
} :rodata
.ctors ALIGN(8) : {
HIDDEN(__ctors = .);
KEEP(*(.ctors))
KEEP(*(.init_array))
__ctors_end = .;
}
HIDDEN(__ctors_end = .);
} :rodata
.bss ALIGN(4096) : {
__bss_start = .;
.text ALIGN(4K) : {
*(.text*)
KEEP(*(.isrs))
} :text
.data ALIGN(4K) : {
*(.data*)
} :rwdata
.syscall_registry : {
*(.syscall_registry*)
} :rwdata
.bss ALIGN(4K) : {
HIDDEN(__bss_start = .);
*(.bss*)
__bss_end = .;
}
HIDDEN(__bss_end = .);
} :bss
.note : {
*(.note.*)
}
.eh_frame : {
__eh_frame_start = .;
KEEP(*(.eh_frame))
__eh_frame_end = .;
}
.eh_frame_hdr : {
KEEP(*(.eh_frame_hdr))
}
__eh_frame_hdr_start = SIZEOF(.eh_frame_hdr) > 0 ? ADDR(.eh_frame_hdr) : 0;
__eh_frame_hdr_end = SIZEOF(.eh_frame_hdr) > 0 ? . : 0;
kernel_end = ALIGN(4096);
HIDDEN(__kernel_end = ALIGN(4096));
}