49 lines
1.8 KiB
Diff
49 lines
1.8 KiB
Diff
The "use BX" option is now a suggestion that BX be used if available.
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Use a macro to detect if BX is available at build time. If so, and
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the user requested it be used, then use it. Otherwise, error out.
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Macro courtesy Khem RAJ:
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http://lists.uclibc.org/pipermail/uclibc/2009-April/042301.html
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Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
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Cc: Khem Raj <raj.khem@gmail.com>
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Cc: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
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Cc: Carmelo AMOROSO <carmelo.amoroso@st.com>
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---
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extra/Configs/Config.arm | 4 +++-
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libc/sysdeps/linux/arm/bits/arm_asm.h | 9 ++++++++-
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2 files changed, 11 insertions(+), 2 deletions(-)
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diff --git a/extra/Configs/Config.arm b/extra/Configs/Config.arm
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index 227b90c..9aa9e56 100644
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--- a/extra/Configs/Config.arm
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+++ b/extra/Configs/Config.arm
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@@ -33,4 +33,6 @@ config COMPILE_IN_THUMB_MODE
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config USE_BX
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bool "Use BX in function return"
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help
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- Use BX instruction for THUMB aware architectures.
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+ Say 'y' to use BX to return from functions on your thumb-aware
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+ processor. Say 'y' if you need to use interworking. Say 'n' if not.
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+ It is safe to say 'y' even if you're not doing interworking.
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diff --git a/libc/sysdeps/linux/arm/bits/arm_asm.h b/libc/sysdeps/linux/arm/bits/arm_asm.h
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index 1d87df6..921c9a3 100644
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--- a/libc/sysdeps/linux/arm/bits/arm_asm.h
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+++ b/libc/sysdeps/linux/arm/bits/arm_asm.h
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@@ -24,5 +24,12 @@
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#define THUMB1_ONLY 1
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#endif
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-#endif /* _ARM_ASM_H */
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+#if defined(__USE_BX__)
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+# if ( defined (__ARM_ARCH_2__) || defined (__ARM_ARCH_3__) \
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+ || defined (__ARM_ARCH_3M__) || defined (__ARM_ARCH_4__) \
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+ )
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+# error Use of BX was requested, but is not available on the target processor.
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+# endif /* ARCH level */
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+#endif /* __USE_BX__ */
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+#endif /* _ARM_ASM_H */
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--
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1.7.1
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