# HG changeset patch
# User Michael Hope <michael.hope@linaro.org>
# Date 1318991252 -46800
# Node ID f320e22f2cba84bf052e9a36ab00138b95637857
# Parent  149c33923f476a7f6027f0db536b533c404ee7d2
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>

diff -r 149c33923f47 -r f320e22f2cba config/target.in
--- a/config/target.in	Wed Oct 19 15:27:32 2011 +1300
+++ b/config/target.in	Wed Oct 19 15:27:32 2011 +1300
@@ -15,6 +15,7 @@
 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_FPU
     bool
 
+config ARCH_SUPPORT_SOFTFP
+    bool
+
 config ARCH_ARCH
     string
     prompt "Architecture level"
@@ -271,6 +275,22 @@
       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 @@
     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"
 
diff -r 149c33923f47 -r f320e22f2cba scripts/build/libc/glibc-eglibc.sh-common
--- a/scripts/build/libc/glibc-eglibc.sh-common	Wed Oct 19 15:27:32 2011 +1300
+++ b/scripts/build/libc/glibc-eglibc.sh-common	Wed Oct 19 15:27:32 2011 +1300
@@ -135,6 +135,7 @@
     case "${CT_ARCH_FLOAT}" in
         hard)   extra_config+=("--with-fp");;
         soft)   extra_config+=("--without-fp");;
+        softfp) extra_config+=("--with-fp");;
     esac
 
     if [ "${CT_LIBC_DISABLE_VERSIONING}" = "y" ]; then
diff -r 149c33923f47 -r f320e22f2cba scripts/functions
--- a/scripts/functions	Wed Oct 19 15:27:32 2011 +1300
+++ b/scripts/functions	Wed Oct 19 15:27:32 2011 +1300
@@ -993,6 +993,10 @@
             CT_ARCH_FLOAT_CFLAG="-msoft-float"
             CT_ARCH_WITH_FLOAT="--with-float=soft"
             ;;
+        softfp)
+            CT_ARCH_FLOAT_CFLAG="-mfloat-abi=softfp"
+            CT_ARCH_WITH_FLOAT="--with-float=softfp"
+            ;;
     esac
 
     # Build the default kernel tuple part