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Code Issues Projects Releases Wiki Activity

Revert "Remove unneeded gcc_except_table section" (#180)

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Philipp Oppermann
2016-06-13 18:36:01 +02:00
committed by GitHub
parent 20d9037740
commit 76b83c623e
2 changed files with 10 additions and 0 deletions
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5
blog/post/2016-01-01-remap-the-kernel.md
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@@ -683,6 +683,11 @@ SECTIONS {
*(.data.rel.ro.local*) *(.data.rel.ro .data.rel.ro.*) *(.data.rel.ro.local*) *(.data.rel.ro .data.rel.ro.*)
. = ALIGN(4K); . = ALIGN(4K);
} }
.gcc_except_table : ALIGN(4K) {
*(.gcc_except_table)
. = ALIGN(4K);
}
} }
``` ```
Instead of page aligning the `.multiboot_header` section, we merge it into the `.rodata` section. That way, we don't waste a whole page for the few bytes of the Multiboot header. We could merge it into any section, but `.rodata` fits best because it has the same flags (neither writable nor executable). The Multiboot header still needs to be at the beginning of the file, so `.rodata` must be our first section now. Instead of page aligning the `.multiboot_header` section, we merge it into the `.rodata` section. That way, we don't waste a whole page for the few bytes of the Multiboot header. We could merge it into any section, but `.rodata` fits best because it has the same flags (neither writable nor executable). The Multiboot header still needs to be at the beginning of the file, so `.rodata` must be our first section now.

5
src/arch/x86_64/linker.ld
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@@ -44,4 +44,9 @@ SECTIONS {
*(.data.rel.ro.local*) *(.data.rel.ro .data.rel.ro.*) *(.data.rel.ro.local*) *(.data.rel.ro .data.rel.ro.*)
. = ALIGN(4K); . = ALIGN(4K);
} }
.gcc_except_table : ALIGN(4K) {
*(.gcc_except_table)
. = ALIGN(4K);
}
} }