15a2901d36
This commit adds a number of patches to uClibc that radically simplifies the Thumb handling. uClibc currently has three options that you need to toggle on Thumb configurations depending on the specific ARM CPU being targeted. However, it turns out that none of those options are necessary: - USE_BX can simply be guessed by looking at the ARM core being used. The bx instruction is available for all ARM cores >= ARMv4T. This is exactly what glibc is doing. - USE_LDREXSTREX can also be guessed by looking at the ARM core being used: whenever you have Thumb2, ldrex/strex is available. - COMPILE_IN_THUMB becomes useless, since all it does is passing -mthumb. But just like the uClibc config options to set --march=<foo> have been removed a long time ago, there's no need to -have an option to pass -mthumb. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
35 lines
1.0 KiB
Diff
35 lines
1.0 KiB
Diff
From 14628e02c40df1229c242270e0e2794f30aeed80 Mon Sep 17 00:00:00 2001
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From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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Date: Thu, 17 Mar 2016 22:46:36 +0100
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Subject: [PATCH] arm: remove USE_LDREXSTREX
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The USE_LDREXSTREX option is no longer needed, get rid of it.
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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---
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extra/Configs/Config.arm | 8 --------
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1 file changed, 8 deletions(-)
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diff --git a/extra/Configs/Config.arm b/extra/Configs/Config.arm
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index 6090ead..0825c42 100644
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--- a/extra/Configs/Config.arm
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+++ b/extra/Configs/Config.arm
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@@ -27,14 +27,6 @@ config CONFIG_ARM_EABI
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config COMPILE_IN_THUMB_MODE
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bool "Build using Thumb mode"
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- select USE_LDREXSTREX
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help
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Say 'y' here to force building uClibc in thumb mode.
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Say 'n' to use your compiler's default mode.
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-
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-config USE_LDREXSTREX
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- bool "Use load-store exclusive ASM ops (not supported in SmartFusion)"
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- depends on COMPILE_IN_THUMB_MODE
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- default n
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- help
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- Say 'y' to use LDREX/STREX ASM ops.
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--
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2.6.4
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