arch/mips: add option for MIPS ABIs

This adds selection for one of the o32, n32 and n64 ABIs.
Later, we can easily use those boolean options, rather than
relying on a user-supplied string option.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

config/arch/mips.in

@@ -8,7 +8,6 @@ config ARCH_mips
     select ARCH_SUPPORTS_BOTH_ENDIAN
     select ARCH_DEFAULT_BE
     select ARCH_SUPPORT_ARCH
-    select ARCH_SUPPORT_ABI
     select ARCH_SUPPORT_TUNE
     help
       The MIPS architecture, as defined by:

config/arch/mips.in.2

@@ -0,0 +1,38 @@
+# MIPS specific config options
+
+choice
+    bool
+    prompt "ABI"
+
+config ARCH_mips_o32
+    bool
+    prompt "o32"
+    depends on ARCH_32
+    help
+      This is the -mabi=32 gcc option.
+
+config ARCH_mips_n32
+    bool
+    prompt "n32"
+    depends on ARCH_64
+    help
+      This is the -mabi=n32 gcc option.
+
+config ARCH_mips_n64
+    bool
+    prompt "n64"
+    depends on ARCH_64
+    help
+      This is the -mabi=64 gcc option.
+
+# Not supported on Linux:
+# o64   : seems related to *BSD
+# eabi  : seems related to bare-metal
+
+endchoice
+
+config ARCH_mips_ABI
+    string
+    default "32"    if ARCH_mips_o32
+    default "n32"   if ARCH_mips_n32
+    default "64"    if ARCH_mips_n64

scripts/build/arch/mips.sh

@@ -14,4 +14,8 @@ CT_DoArchTupleValues() {
         y,) CT_ARCH_ENDIAN_CFLAG="-EB";;
         ,y) CT_ARCH_ENDIAN_CFLAG="-EL";;
     esac
+
+    # Override ABI flags
+    CT_ARCH_ABI_CFLAG="-mabi=${CT_ARCH_mips_ABI}"
+    CT_ARCH_WITH_ABI="--with-abi=${CT_ARCH_mips_ABI}"
 }