leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

arm64: use local label prefixes for __reg_num symbols

Browse Source 
The __reg_num_xNN symbols that are used to implement the msr_s and
mrs_s macros are recorded in the ELF metadata of each object file.
This does not affect the size of the final binary, but it does clutter
the output of tools like readelf, i.e.,

  $ readelf -a vmlinux |grep -c __reg_num_x
  50976

So let's use symbols with the .L prefix, these are strictly local,
and don't end up in the object files.

  $ readelf -a vmlinux |grep -c __reg_num_x
  0

Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Ard Biesheuvel 2016-02-15 09:51:49 +01:00 committed by Catalin Marinas
parent 88d8a7994e
commit 7abc7d833c
1 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
arch/arm64/include/asm/sysreg.h
View File

@ -196,16 +196,16 @@
#ifdef __ASSEMBLY__
.irp num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30
.equ __reg_num_x\num, \num
.equ .L__reg_num_x\num, \num
.endr
.equ __reg_num_xzr, 31
.equ .L__reg_num_xzr, 31
.macro mrs_s, rt, sreg
.inst 0xd5200000|(\sreg)|(__reg_num_\rt)
.inst 0xd5200000|(\sreg)|(.L__reg_num_\rt)
.endm
.macro msr_s, sreg, rt
.inst 0xd5000000|(\sreg)|(__reg_num_\rt)
.inst 0xd5000000|(\sreg)|(.L__reg_num_\rt)
.endm
#else
@ -214,16 +214,16 @@
asm(
" .irp num,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30\n"
" .equ __reg_num_x\\num, \\num\n"
" .equ .L__reg_num_x\\num, \\num\n"
" .endr\n"
" .equ __reg_num_xzr, 31\n"
" .equ .L__reg_num_xzr, 31\n"
"\n"
" .macro mrs_s, rt, sreg\n"
" .inst 0xd5200000|(\\sreg)|(__reg_num_\\rt)\n"
" .inst 0xd5200000|(\\sreg)|(.L__reg_num_\\rt)\n"
" .endm\n"
"\n"
" .macro msr_s, sreg, rt\n"
" .inst 0xd5000000|(\\sreg)|(__reg_num_\\rt)\n"
" .inst 0xd5000000|(\\sreg)|(.L__reg_num_\\rt)\n"
" .endm\n"
);