[PATCH 11/12] ARM: head.S: use PC relative insn sequence to calculate PHYS_OFFSET
From: Ard Biesheuvel <ardb@kernel.org>
Date: 2020-09-14 10:00:15
Also in:
linux-efi
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
Replace the open coded arithmetic with a simple adr_l/sub pair. This removes some open coded arithmetic involving virtual addresses, avoids literal pools on v7+, and slightly reduces the footprint of the code. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> --- arch/arm/kernel/head.S | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-)
diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S
index 6f334df5d3b9..2e6127b2662e 100644
--- a/arch/arm/kernel/head.S
+++ b/arch/arm/kernel/head.S@@ -103,10 +103,8 @@ ENTRY(stext) #endif #ifndef CONFIG_XIP_KERNEL - adr r3, 2f - ldmia r3, {r4, r8} - sub r4, r3, r4 @ (PHYS_OFFSET - PAGE_OFFSET) - add r8, r8, r4 @ PHYS_OFFSET + adr_l r8, _text @ __pa(_text) + sub r8, r8, #TEXT_OFFSET @ PHYS_OFFSET #else ldr r8, =PLAT_PHYS_OFFSET @ always constant in this case #endif
@@ -158,10 +156,6 @@ ENTRY(stext) 1: b __enable_mmu ENDPROC(stext) .ltorg -#ifndef CONFIG_XIP_KERNEL -2: .long . - .long PAGE_OFFSET -#endif /* * Setup the initial page tables. We only setup the barest
--
2.17.1
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