From 3bcf906b194cebb6817cbb2f07b69e12aa5d7f51 Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Mon, 14 Sep 2020 11:25:46 +0300 Subject: [PATCH] ARM: head.S: use PC relative insn sequence to calculate PHYS_OFFSET 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. Reviewed-by: Nicolas Pitre Signed-off-by: Ard Biesheuvel --- 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 5e031a0bf9a96..ae0b08b47f52c 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 -- 2.30.2