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