diff options
| author | Nicholas Piggin | 2022-09-16 14:07:51 +1000 |
|---|---|---|
| committer | Michael Ellerman | 2022-09-26 20:58:17 +1000 |
| commit | f21ba4499a15b76ad6013ca0a60873dbcf164c7b (patch) | |
| tree | c74a51f7b85fc4d0c19c60a2dfe76fbb6d868096 /arch/powerpc | |
| parent | 1faa1235c1a00614bc4849a8dbd0790363c9a22f (diff) | |
powerpc/build: move got, toc, plt, branch_lt sections to read-only
This moves linker-related tables from .data to read-only area.
Relocations are performed at early boot time before memory is protected,
after which there should be no modifications required.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Don't use SPECIAL as reported by lkp@intel.com]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220916040755.2398112-4-npiggin@gmail.com
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/kernel/vmlinux.lds.S | 32 |
1 files changed, 22 insertions, 10 deletions
diff --git a/arch/powerpc/kernel/vmlinux.lds.S b/arch/powerpc/kernel/vmlinux.lds.S index a922c348b4f7..0bacec66fecf 100644 --- a/arch/powerpc/kernel/vmlinux.lds.S +++ b/arch/powerpc/kernel/vmlinux.lds.S @@ -135,6 +135,10 @@ SECTIONS /* Read-only data */ RO_DATA(PAGE_SIZE) + .branch_lt : AT(ADDR(.branch_lt) - LOAD_OFFSET) { + *(.branch_lt) + } + #ifdef CONFIG_PPC32 .got1 : AT(ADDR(.got1) - LOAD_OFFSET) { *(.got1) @@ -144,7 +148,25 @@ SECTIONS *(.got2) __got2_end = .; } + .got : AT(ADDR(.got) - LOAD_OFFSET) { + *(.got) + *(.got.plt) + } + .plt : AT(ADDR(.plt) - LOAD_OFFSET) { + /* XXX: is .plt (and .got.plt) required? */ + *(.plt) + } + #else /* CONFIG_PPC32 */ + .toc1 : AT(ADDR(.toc1) - LOAD_OFFSET) { + *(.toc1) + } + + .got : AT(ADDR(.got) - LOAD_OFFSET) ALIGN(256) { + *(.got) + *(.toc) + } + SOFT_MASK_TABLE(8) RESTART_TABLE(8) @@ -333,21 +355,11 @@ SECTIONS *(.data.rel*) *(SDATA_MAIN) *(.sdata2) - *(.got.plt) *(.got) - *(.plt) - *(.branch_lt) } #else .data : AT(ADDR(.data) - LOAD_OFFSET) { DATA_DATA *(.data.rel*) - *(.toc1) - *(.branch_lt) - } - - .got : AT(ADDR(.got) - LOAD_OFFSET) ALIGN(256) { - *(.got) - *(.toc) } #endif |