libffi: backport patch to fix building MIPS soft float

Upstream-Status: Backport [https://github.com/libffi/libffi/commit/2ded2a4f494165c93293afc14ab0be1243cf8c49]

(From OE-Core rev: 0231a6f92d2c8b89b419aeb09a4b35f871bfb2bf)

(From OE-Core rev: 0ce7415bb50bf1941981ef61590fe642b055d290)

Signed-off-by: André Draszik <git@andred.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

2 files changed, 178 insertions, 0 deletions

diff --git a/meta/recipes-support/libffi/libffi/0001-mips-fix-MIPS-softfloat-build-issue.patch b/meta/recipes-support/libffi/libffi/0001-mips-fix-MIPS-softfloat-build-issue.patch
new file mode 100644
index 0000000000..61c9eb31d1
--- /dev/null
+++ b/meta/recipes-support/libffi/libffi/0001-mips-fix-MIPS-softfloat-build-issue.patch
@@ -0,0 +1,177 @@
+From 655e82c92d5c3875aee04322f1993d6b0774a7bf Mon Sep 17 00:00:00 2001
+From: Yousong Zhou <yszhou4tech@gmail.com>
+Date: Mon, 15 Aug 2016 15:00:13 +0800
+Subject: [PATCH] mips: fix MIPS softfloat build issue
+
+The patch for o32.S is taken from OpenWrt packages repo 3a7a4bf "libffi:
+fix MIPS softfloat build issue with current binutils"
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
+---
+Upstream-Status: Backport [https://github.com/libffi/libffi/commit/2ded2a4f494165c93293afc14ab0be1243cf8c49]
+ src/mips/n32.S | 17 +++++++++++++++++
+ src/mips/o32.S | 17 +++++++++++++++++
+ 2 files changed, 34 insertions(+)
+
+diff --git a/src/mips/n32.S b/src/mips/n32.S
+index c6985d3..8f25994 100644
+--- a/src/mips/n32.S
++++ b/src/mips/n32.S
+@@ -107,6 +107,16 @@ loadregs:
+ 
+        REG_L   t6, 3*FFI_SIZEOF_ARG($fp)  # load the flags word into t6.
+ 
++#ifdef __mips_soft_float
++       REG_L   a0, 0*FFI_SIZEOF_ARG(t9)
++       REG_L   a1, 1*FFI_SIZEOF_ARG(t9)
++       REG_L   a2, 2*FFI_SIZEOF_ARG(t9)
++       REG_L   a3, 3*FFI_SIZEOF_ARG(t9)
++       REG_L   a4, 4*FFI_SIZEOF_ARG(t9)
++       REG_L   a5, 5*FFI_SIZEOF_ARG(t9)
++       REG_L   a6, 6*FFI_SIZEOF_ARG(t9)
++       REG_L   a7, 7*FFI_SIZEOF_ARG(t9)
++#else
+        and     t4, t6, ((1<<FFI_FLAG_BITS)-1)
+        REG_L   a0, 0*FFI_SIZEOF_ARG(t9)
+        beqz    t4, arg1_next
+@@ -193,6 +203,7 @@ arg7_next:
+ arg8_doublep:  
+        l.d     $f19, 7*FFI_SIZEOF_ARG(t9)      
+ arg8_next:     
++#endif
+ 
+ callit:                
+        # Load the function pointer
+@@ -214,6 +225,7 @@ retint:
+        b       epilogue
+ 
+ retfloat:
++#ifndef __mips_soft_float
+        bne     t6, FFI_TYPE_FLOAT, retdouble
+        jal     t9
+        REG_L   t4, 4*FFI_SIZEOF_ARG($fp)
+@@ -272,6 +284,7 @@ retstruct_f_d:
+        s.s     $f0, 0(t4)
+        s.d     $f2, 8(t4)
+        b       epilogue
++#endif
+ 
+ retstruct_d_soft:
+        bne     t6, FFI_TYPE_STRUCT_D_SOFT, retstruct_f_soft
+@@ -429,6 +442,7 @@ ffi_closure_N32:
+        REG_S   a6, A6_OFF2($sp)
+        REG_S   a7, A7_OFF2($sp)
+ 
++#ifndef __mips_soft_float
+        # Store all possible float/double registers.
+        s.d     $f12, F12_OFF2($sp)
+        s.d     $f13, F13_OFF2($sp)
+@@ -438,6 +452,7 @@ ffi_closure_N32:
+        s.d     $f17, F17_OFF2($sp)
+        s.d     $f18, F18_OFF2($sp)
+        s.d     $f19, F19_OFF2($sp)
++#endif
+ 
+        # Call ffi_closure_mips_inner_N32 to do the real work.
+        LA      t9, ffi_closure_mips_inner_N32
+@@ -458,6 +473,7 @@ cls_retint:
+        b       cls_epilogue
+ 
+ cls_retfloat:
++#ifndef __mips_soft_float
+        bne     v0, FFI_TYPE_FLOAT, cls_retdouble
+        l.s     $f0, V0_OFF2($sp)
+        b       cls_epilogue
+@@ -500,6 +516,7 @@ cls_retstruct_f_d:
+        l.s     $f0, V0_OFF2($sp)
+        l.d     $f2, V1_OFF2($sp)
+        b       cls_epilogue
++#endif
+        
+ cls_retstruct_small2:  
+        REG_L   v0, V0_OFF2($sp)
+diff --git a/src/mips/o32.S b/src/mips/o32.S
+index eb27981..429dd0a 100644
+--- a/src/mips/o32.S
++++ b/src/mips/o32.S
+@@ -82,13 +82,16 @@ sixteen:
+                
+        ADDU    $sp, 4 * FFI_SIZEOF_ARG         # adjust $sp to new args
+ 
++#ifndef __mips_soft_float
+        bnez    t0, pass_d                      # make it quick for int
++#endif
+        REG_L   a0, 0*FFI_SIZEOF_ARG($sp)       # just go ahead and load the
+        REG_L   a1, 1*FFI_SIZEOF_ARG($sp)       # four regs.
+        REG_L   a2, 2*FFI_SIZEOF_ARG($sp)
+        REG_L   a3, 3*FFI_SIZEOF_ARG($sp)
+        b       call_it
+ 
++#ifndef __mips_soft_float
+ pass_d:
+        bne     t0, FFI_ARGS_D, pass_f
+        l.d     $f12, 0*FFI_SIZEOF_ARG($sp)     # load $fp regs from args
+@@ -130,6 +133,7 @@ pass_f_d:
+  #     bne     t0, FFI_ARGS_F_D, call_it
+        l.s     $f12, 0*FFI_SIZEOF_ARG($sp)     # load $fp regs from args
+        l.d     $f14, 2*FFI_SIZEOF_ARG($sp)     # passing double and float
++#endif
+ 
+ call_it:       
+        # Load the function pointer
+@@ -158,14 +162,23 @@ retfloat:
+        bne     t2, FFI_TYPE_FLOAT, retdouble
+        jalr    t9
+        REG_L   t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
++#ifndef __mips_soft_float
+        s.s     $f0, 0(t0)
++#else
++       REG_S   v0, 0(t0)
++#endif
+        b       epilogue
+ 
+ retdouble:     
+        bne     t2, FFI_TYPE_DOUBLE, noretval
+        jalr    t9
+        REG_L   t0, SIZEOF_FRAME + 4*FFI_SIZEOF_ARG($fp)
++#ifndef __mips_soft_float
+        s.d     $f0, 0(t0)
++#else
++       REG_S   v1, 4(t0)
++       REG_S   v0, 0(t0)
++#endif
+        b       epilogue
+        
+ noretval:      
+@@ -261,9 +274,11 @@ $LCFI7:
+        li      $13, 1          # FFI_O32
+        bne     $16, $13, 1f    # Skip fp save if FFI_O32_SOFT_FLOAT
+        
++#ifndef __mips_soft_float
+        # Store all possible float/double registers.
+        s.d     $f12, FA_0_0_OFF2($fp)
+        s.d     $f14, FA_1_0_OFF2($fp)
++#endif
+ 1:     
+        # Call ffi_closure_mips_inner_O32 to do the work.
+        la      t9, ffi_closure_mips_inner_O32
+@@ -281,6 +296,7 @@ $LCFI7:
+        li      $13, 1          # FFI_O32
+        bne     $16, $13, 1f    # Skip fp restore if FFI_O32_SOFT_FLOAT
+ 
++#ifndef __mips_soft_float
+        li      $9, FFI_TYPE_FLOAT
+        l.s     $f0, V0_OFF2($fp)
+        beq     $8, $9, closure_done
+@@ -288,6 +304,7 @@ $LCFI7:
+        li      $9, FFI_TYPE_DOUBLE
+        l.d     $f0, V0_OFF2($fp)
+        beq     $8, $9, closure_done
++#endif
+ 1:     
+        REG_L   $3, V1_OFF2($fp)
+        REG_L   $2, V0_OFF2($fp)
+-- 
+2.9.3
+
diff --git a/meta/recipes-support/libffi/libffi_3.2.1.bb b/meta/recipes-support/libffi/libffi_3.2.1.bb
index 0aff3f5466..43eee8efc4 100644
--- a/meta/recipes-support/libffi/libffi_3.2.1.bb
+++ b/meta/recipes-support/libffi/libffi_3.2.1.bb
@@ -12,6 +12,7 @@ LIC_FILES_CHKSUM = "file://LICENSE;md5=3610bb17683a0089ed64055416b2ae1b"
 SRC_URI = "ftp://sourceware.org/pub/libffi/${BP}.tar.gz \
            file://not-win32.patch \
            file://0001-mips-Use-compiler-internal-define-for-linux.patch \
+           file://0001-mips-fix-MIPS-softfloat-build-issue.patch \
            "
 
 SRC_URI[md5sum] = "83b89587607e3eb65c70d361f13bab43"