libffi: fix MIPS softfloat build issue with current binutils

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

diff --git a/libs/libffi/patches/100-fix_mips_softfloat.patch b/libs/libffi/patches/100-fix_mips_softfloat.patch
new file mode 100644 (file)
index 0000000..bdd5a9a
--- /dev/null
+++ b/libs/libffi/patches/100-fix_mips_softfloat.patch
@@ -0,0 +1,79 @@
+--- 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)