diff options
| author |   Yann E. MORIN" <yann.morin.1998@anciens.enib.fr> | 2011-10-19 02:27:32 (GMT) |
|---|---|---|
| committer |   Michael Hope <michael.hope@linaro.org> | 2011-10-19 02:27:32 (GMT) |
| commit | 4fc56b1d14ffb5e48956dfdd0ce10cd9ac5dd6b6 (patch) | |
| tree | 89a62bc3e0b18534e42db5d271571c2d105f116d /config/target.in | |
| parent | 67ede2f5d46768a97359f6f4ab345c76e726b2d8 (diff) | |
arch: add softfp support
Some architectures support a mixed hard/soft floating point, where
the compiler emits hardware floating point instructions, but passes
the operands in core (aka integer) registers.
For example, ARM supports this mode (to come in the next changeset).
Add support for softfp cross compilers to the GCC and GLIBC
configuration. Needed for Ubuntu and other distros that are softfp.
Signed-off-by: Michael Hope <michael.hope@linaro.org>
[yann.morin.1998@anciens.enib.fr: split the original patch]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
Diffstat (limited to 'config/target.in')
| -rw-r--r-- | config/target.in | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/config/target.in b/config/target.in index d38e4c1..b94db3c 100644 --- a/config/target.in +++ b/config/target.in @@ -15,6 +15,7 @@ config ARCH_SUPPORT_ABI config ARCH_SUPPORT_CPU config ARCH_SUPPORT_TUNE config ARCH_SUPPORT_FPU +config ARCH_SUPPORT_SOFTFP config ARCH_DEFAULT_HAS_MMU config ARCH_DEFAULT_BE @@ -144,6 +145,9 @@ config ARCH_SUPPORT_TUNE config ARCH_SUPPORT_FPU bool +config ARCH_SUPPORT_SOFTFP + bool + config ARCH_ARCH string prompt "Architecture level" @@ -271,6 +275,22 @@ config ARCH_FLOAT_SW If your processor has no FPU, then you most probably want this, as it is faster than emulating the FPU in the kernel. +config ARCH_FLOAT_SOFTFP + bool + prompt "softfp" + depends on ARCH_SUPPORT_SOFTFP + help + Emit hardware floating point opcodes but use the software + floating point calling convention. + + Architectures such as ARM use different registers for passing + floating point values depending on if they're in software mode + or hardware mode. softfp emits FPU instructions but uses the + software FP calling convention allowing softfp code to + interoperate with legacy software only code. + + If in doubt, use 'software' or 'hardware' mode instead. + endchoice config TARGET_CFLAGS @@ -300,6 +320,7 @@ config ARCH_FLOAT string default "hard" if ARCH_FLOAT_HW default "soft" if ARCH_FLOAT_SW + default "softfp" if ARCH_FLOAT_SOFTFP source "config.gen/arch.in.2" |