toolchain/musl/patches/010-Add-PowerPC-soft-float-support.patch

   1 From: Felix Fietkau <nbd@openwrt.org>
   2 Date: Wed, 8 Jul 2015 13:56:37 +0200
   3 Subject: [PATCH] Add PowerPC soft-float support
   4
   5 Some PowerPC CPUs (e.g. Freescale MPC85xx) have a completely different
   6 instruction set for floating point operations (SPE).
   7 Executing regular PowerPC floating point instructions results in
   8 "Illegal instruction" errors.
   9
  10 Until support for SPE FPU is added, make it possible to run these
  11 devices in soft-float mode.
  12
  13 Signed-off-by: Felix Fietkau <nbd@openwrt.org>
  14 ---
  15  create mode 100644 src/fenv/powerpc-sf/fenv.sub
  16  create mode 100644 src/setjmp/powerpc-sf/longjmp.s
  17  create mode 100644 src/setjmp/powerpc-sf/longjmp.sub
  18  create mode 100644 src/setjmp/powerpc-sf/setjmp.s
  19  create mode 100644 src/setjmp/powerpc-sf/setjmp.sub
  20
  21 --- a/configure
  22 +++ b/configure
  23 @@ -498,6 +498,10 @@ trycppif "_MIPSEL || __MIPSEL || __MIPSE
  24  trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
  25  fi
  26
  27 +if test "$ARCH" = "powerpc" ; then
  28 +trycppif _SOFT_FLOAT "$t" && SUBARCH=${SUBARCH}-sf
  29 +fi
  30 +
  31  test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
  32  && SUBARCH=${SUBARCH}el
  33
  34 --- /dev/null
  35 +++ b/src/fenv/powerpc-sf/fenv.sub
  36 @@ -0,0 +1 @@
  37 +../fenv.c
  38 --- /dev/null
  39 +++ b/src/setjmp/powerpc-sf/longjmp.s
  40 @@ -0,0 +1,47 @@
  41 +       .global _longjmp
  42 +       .global longjmp
  43 +       .type   _longjmp,@function
  44 +       .type   longjmp,@function
  45 +_longjmp:
  46 +longjmp:
  47 +# void longjmp(jmp_buf env, int val);
  48 +# put val into return register and restore the env saved in setjmp
  49 +# if val(r4) is 0, put 1 there.
  50 +       # 0) move old return address into r0
  51 +       lwz 0, 0(3)
  52 +       # 1) put it into link reg
  53 +       mtlr 0
  54 +       #2 ) restore stack ptr
  55 +       lwz 1, 4(3)
  56 +       #3) restore control reg
  57 +       lwz 0, 8(3)
  58 +       mtcr 0
  59 +       #4) restore r14-r31
  60 +       lwz 14, 12(3)
  61 +       lwz 15, 16(3)
  62 +       lwz 16, 20(3)
  63 +       lwz 17, 24(3)
  64 +       lwz 18, 28(3)
  65 +       lwz 19, 32(3)
  66 +       lwz 20, 36(3)
  67 +       lwz 21, 40(3)
  68 +       lwz 22, 44(3)
  69 +       lwz 23, 48(3)
  70 +       lwz 24, 52(3)
  71 +       lwz 25, 56(3)
  72 +       lwz 26, 60(3)
  73 +       lwz 27, 64(3)
  74 +       lwz 28, 68(3)
  75 +       lwz 29, 72(3)
  76 +       lwz 30, 76(3)
  77 +       lwz 31, 80(3)
  78 +       #5) put val into return reg r3
  79 +       mr 3, 4
  80 +
  81 +       #6) check if return value is 0, make it 1 in that case
  82 +       cmpwi cr7, 4, 0
  83 +       bne cr7, 1f
  84 +       li 3, 1
  85 +1:
  86 +       blr
  87 +
  88 --- /dev/null
  89 +++ b/src/setjmp/powerpc-sf/longjmp.sub
  90 @@ -0,0 +1 @@
  91 +longjmp.s
  92 --- /dev/null
  93 +++ b/src/setjmp/powerpc-sf/setjmp.s
  94 @@ -0,0 +1,43 @@
  95 +       .global ___setjmp
  96 +       .hidden ___setjmp
  97 +       .global __setjmp
  98 +       .global _setjmp
  99 +       .global setjmp
 100 +       .type   __setjmp,@function
 101 +       .type   _setjmp,@function
 102 +       .type   setjmp,@function
 103 +___setjmp:
 104 +__setjmp:
 105 +_setjmp:
 106 +setjmp:
 107 +       # 0) store IP int 0, then into the jmpbuf pointed to by r3 (first arg)
 108 +       mflr 0
 109 +       stw 0, 0(3)
 110 +       # 1) store reg1 (SP)
 111 +       stw 1, 4(3)
 112 +       # 2) store cr
 113 +       mfcr 0
 114 +       stw 0, 8(3)
 115 +       # 3) store r14-31
 116 +       stw 14, 12(3)
 117 +       stw 15, 16(3)
 118 +       stw 16, 20(3)
 119 +       stw 17, 24(3)
 120 +       stw 18, 28(3)
 121 +       stw 19, 32(3)
 122 +       stw 20, 36(3)
 123 +       stw 21, 40(3)
 124 +       stw 22, 44(3)
 125 +       stw 23, 48(3)
 126 +       stw 24, 52(3)
 127 +       stw 25, 56(3)
 128 +       stw 26, 60(3)
 129 +       stw 27, 64(3)
 130 +       stw 28, 68(3)
 131 +       stw 29, 72(3)
 132 +       stw 30, 76(3)
 133 +       stw 31, 80(3)
 134 +       # 4) set return value to 0
 135 +       li 3, 0
 136 +       # 5) return
 137 +       blr
 138 --- /dev/null
 139 +++ b/src/setjmp/powerpc-sf/setjmp.sub
 140 @@ -0,0 +1 @@
 141 +setjmp.s