From: ard.biesheuvel@linaro.org (Ard Biesheuvel)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 0/8] ARM: clean up PC-relative arithmetic
Date: Wed, 3 Aug 2016 17:38:42 +0200 [thread overview]
Message-ID: <1470238730-30038-1-git-send-email-ard.biesheuvel@linaro.org> (raw)
There are various places in the ARM kernel where the following pattern
is used to create a PC-relative reference that is valid even before the
MMU is on:
adr rX, 1f
ldr rY, [rX]
add rX, rX, rY
...
1: .long <symbol> - .
or
adr rX, 1f
ldmia rX, {rY .. rY+n}
sub rX, rX, rY
add rY+1, rY+1, rX
add rY+2, rY+2, rX
...
1: .long .
.long <symbolY>
.long <symbolY+1>
...
Both cases can be greatly simplified by letting the linker do the
calculations for us. This series implements adr_l, ldr_l and str_l
macros, and uses them to simplify a couple of instances of the above
patterns.
Ard Biesheuvel (8):
ARM: assembler: introduce adr_l, ldr_l and str_l macros
ARM: head-common.S: use PC-relative insn sequence for __proc_info
ARM: head-common.S: use PC-relative insn sequence for __turn_mmu_on
ARM: head.S: use PC-relative insn sequence for secondary_data
ARM: head: use PC-relative insn sequence for __smp_alt
ARM: sleep.S: use PC-relative insn sequence for
sleep_save_sp/mpidr_hash
ARM: head.S: use PC-relative insn sequences for __fixup_pv_table
ARM: head.S: use PC relative insn sequence to calculate PHYS_OFFSET
arch/arm/include/asm/assembler.h | 59 ++++++++++++++
arch/arm/kernel/head-common.S | 22 ++---
arch/arm/kernel/head.S | 86 +++++---------------
arch/arm/kernel/sleep.S | 15 +---
4 files changed, 88 insertions(+), 94 deletions(-)
--
2.7.4
next reply other threads:[~2016-08-03 15:38 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-03 15:38 Ard Biesheuvel [this message]
2016-08-03 15:38 ` [PATCH 1/8] ARM: assembler: introduce adr_l, ldr_l and str_l macros Ard Biesheuvel
2016-08-03 16:49 ` Dave Martin
2016-08-04 7:40 ` Ard Biesheuvel
2016-08-04 9:44 ` Dave Martin
2016-08-04 10:34 ` Ard Biesheuvel
2016-08-04 11:22 ` Dave Martin
2016-08-04 12:16 ` Russell King - ARM Linux
2016-08-04 12:55 ` Dave Martin
2016-08-04 13:58 ` Ard Biesheuvel
2016-08-04 7:43 ` Ard Biesheuvel
2016-08-03 18:09 ` Russell King - ARM Linux
2016-08-04 7:40 ` Ard Biesheuvel
2016-08-04 9:38 ` Dave Martin
2016-08-04 10:12 ` Ard Biesheuvel
2016-08-04 11:08 ` Dave Martin
2016-08-04 11:10 ` Ard Biesheuvel
2016-08-04 11:30 ` Dave Martin
2016-08-04 11:34 ` Ard Biesheuvel
2016-08-04 13:31 ` Dave Martin
2016-08-04 13:46 ` Ard Biesheuvel
2016-08-04 15:38 ` Dave Martin
2016-08-03 15:38 ` [PATCH 2/8] ARM: head-common.S: use PC-relative insn sequence for __proc_info Ard Biesheuvel
2016-08-03 15:38 ` [PATCH 3/8] ARM: head-common.S: use PC-relative insn sequence for __turn_mmu_on Ard Biesheuvel
2016-08-03 15:38 ` [PATCH 4/8] ARM: head.S: use PC-relative insn sequence for secondary_data Ard Biesheuvel
2016-08-03 18:06 ` Russell King - ARM Linux
2016-08-03 15:38 ` [PATCH 5/8] ARM: head: use PC-relative insn sequence for __smp_alt Ard Biesheuvel
2016-08-03 15:38 ` [PATCH 6/8] ARM: sleep.S: use PC-relative insn sequence for sleep_save_sp/mpidr_hash Ard Biesheuvel
2016-08-03 15:38 ` [PATCH 7/8] ARM: head.S: use PC-relative insn sequences for __fixup_pv_table Ard Biesheuvel
2016-08-03 15:38 ` [PATCH 8/8] ARM: head.S: use PC relative insn sequence to calculate PHYS_OFFSET Ard Biesheuvel
2016-08-03 18:17 ` [PATCH 0/8] ARM: clean up PC-relative arithmetic Russell King - ARM Linux
2016-08-04 7:17 ` Ard Biesheuvel
2016-08-04 9:49 ` Russell King - ARM Linux
2016-08-04 9:54 ` Ard Biesheuvel
2016-08-04 10:03 ` Russell King - ARM Linux
2016-08-04 10:11 ` Ard Biesheuvel
2016-08-04 10:14 ` Russell King - ARM Linux
2016-08-03 18:27 ` Nicolas Pitre
2016-08-04 14:11 ` Ard Biesheuvel
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