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Merge patch series "riscv: vdso.lds.S: some improvement"

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Jisheng Zhang <jszhang@kernel.org> says:

This series renews one of my last year RFC patch[1], tries to improve
the vdso layout a bit.

patch1 removes useless symbols
patch2 merges .data section of vdso into .rodata because they are
readonly
patch3 is the real renew patch, it removes hardcoded 0x800 .text start
addr. But I rewrite the commit msg per Andrew's suggestions and move
move .note, .eh_frame_hdr, and .eh_frame between .rodata and .text to
keep the actual code well away from the non-instruction data.

* b4-shazam-merge:
  riscv: vdso.lds.S: remove hardcoded 0x800 .text start addr
  riscv: vdso.lds.S: merge .data section into .rodata section
  riscv: vdso.lds.S: drop __alt_start and __alt_end symbols

Link: https://lore.kernel.org/linux-riscv/20221123161805.1579-1-jszhang@kernel.org/ [1]
Link: https://lore.kernel.org/r/20230912072015.2424-1-jszhang@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Palmer Dabbelt 2023-11-05 14:15:17 -08:00
commit 7f00a97500
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1 changed files with 19 additions and 23 deletions
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42
arch/riscv/kernel/vdso/vdso.lds.S
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@ -23,36 +23,32 @@ SECTIONS
.gnu.version_d : { *(.gnu.version_d) }
.gnu.version_r : { *(.gnu.version_r) }
.note : { *(.note.*) } :text :note
.dynamic : { *(.dynamic) } :text :dynamic
.eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr
.eh_frame : { KEEP (*(.eh_frame)) } :text
.rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) }
/*
* This linker script is used both with -r and with -shared.
* For the layouts to match, we need to skip more than enough
* space for the dynamic symbol table, etc. If this amount is
* insufficient, ld -shared will error; simply increase it here.
*/
. = 0x800;
.text : { *(.text .text.*) } :text
. = ALIGN(4);
.alternative : {
__alt_start = .;
*(.alternative)
__alt_end = .;
}
.data : {
.rodata : {
*(.rodata .rodata.* .gnu.linkonce.r.*)
*(.got.plt) *(.got)
*(.data .data.* .gnu.linkonce.d.*)
*(.dynbss)
*(.bss .bss.* .gnu.linkonce.b.*)
}
.note : { *(.note.*) } :text :note
.eh_frame_hdr : { *(.eh_frame_hdr) } :text :eh_frame_hdr
.eh_frame : { KEEP (*(.eh_frame)) } :text
/*
* Text is well-separated from actual data: there's plenty of
* stuff that isn't used at runtime in between.
*/
. = ALIGN(16);
.text : { *(.text .text.*) } :text
. = ALIGN(4);
.alternative : {
*(.alternative)
}
}
/*