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 Make it possible to run these devices in soft-float mode.
  11
  12 Signed-off-by: Felix Fietkau <nbd@openwrt.org>
  13 ---
  14  create mode 100644 src/fenv/powerpc-sf/fenv.sub
  15  create mode 100644 src/setjmp/powerpc-sf/longjmp.s
  16  create mode 100644 src/setjmp/powerpc-sf/longjmp.sub
  17  create mode 100644 src/setjmp/powerpc-sf/setjmp.s
  18  create mode 100644 src/setjmp/powerpc-sf/setjmp.sub
  19
  20 --- a/arch/powerpc/reloc.h
  21 +++ b/arch/powerpc/reloc.h
  22 @@ -1,4 +1,10 @@
  23 -#define LDSO_ARCH "powerpc"
  24 +#ifdef _SOFT_FLOAT
  25 +#define FP_SUFFIX "-sf"
  26 +#else
  27 +#define FP_SUFFIX ""
  28 +#endif
  29 +
  30 +#define LDSO_ARCH "powerpc" FP_SUFFIX
  31
  32  #define TPOFF_K (-0x7000)
  33
  34 --- a/configure
  35 +++ b/configure
  36 @@ -522,6 +522,10 @@ trycppif "_MIPSEL || __MIPSEL || __MIPSE
  37  trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf
  38  fi
  39
  40 +if test "$ARCH" = "powerpc" ; then
  41 +trycppif _SOFT_FLOAT "$t" && SUBARCH=${SUBARCH}-sf
  42 +fi
  43 +
  44  test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \
  45  && SUBARCH=${SUBARCH}el
  46
  47 --- /dev/null
  48 +++ b/src/fenv/powerpc-sf/fenv.sub
  49 @@ -0,0 +1 @@
  50 +../fenv.c
  51 --- /dev/null
  52 +++ b/src/setjmp/powerpc-sf/longjmp.s
  53 @@ -0,0 +1,47 @@
  54 +       .global _longjmp
  55 +       .global longjmp
  56 +       .type   _longjmp,@function
  57 +       .type   longjmp,@function
  58 +_longjmp:
  59 +longjmp:
  60 +# void longjmp(jmp_buf env, int val);
  61 +# put val into return register and restore the env saved in setjmp
  62 +# if val(r4) is 0, put 1 there.
  63 +       # 0) move old return address into r0
  64 +       lwz 0, 0(3)
  65 +       # 1) put it into link reg
  66 +       mtlr 0
  67 +       #2 ) restore stack ptr
  68 +       lwz 1, 4(3)
  69 +       #3) restore control reg
  70 +       lwz 0, 8(3)
  71 +       mtcr 0
  72 +       #4) restore r14-r31
  73 +       lwz 14, 12(3)
  74 +       lwz 15, 16(3)
  75 +       lwz 16, 20(3)
  76 +       lwz 17, 24(3)
  77 +       lwz 18, 28(3)
  78 +       lwz 19, 32(3)
  79 +       lwz 20, 36(3)
  80 +       lwz 21, 40(3)
  81 +       lwz 22, 44(3)
  82 +       lwz 23, 48(3)
  83 +       lwz 24, 52(3)
  84 +       lwz 25, 56(3)
  85 +       lwz 26, 60(3)
  86 +       lwz 27, 64(3)
  87 +       lwz 28, 68(3)
  88 +       lwz 29, 72(3)
  89 +       lwz 30, 76(3)
  90 +       lwz 31, 80(3)
  91 +       #5) put val into return reg r3
  92 +       mr 3, 4
  93 +
  94 +       #6) check if return value is 0, make it 1 in that case
  95 +       cmpwi cr7, 4, 0
  96 +       bne cr7, 1f
  97 +       li 3, 1
  98 +1:
  99 +       blr
 100 +
 101 --- /dev/null
 102 +++ b/src/setjmp/powerpc-sf/longjmp.sub
 103 @@ -0,0 +1 @@
 104 +longjmp.s
 105 --- /dev/null
 106 +++ b/src/setjmp/powerpc-sf/setjmp.s
 107 @@ -0,0 +1,43 @@
 108 +       .global ___setjmp
 109 +       .hidden ___setjmp
 110 +       .global __setjmp
 111 +       .global _setjmp
 112 +       .global setjmp
 113 +       .type   __setjmp,@function
 114 +       .type   _setjmp,@function
 115 +       .type   setjmp,@function
 116 +___setjmp:
 117 +__setjmp:
 118 +_setjmp:
 119 +setjmp:
 120 +       # 0) store IP int 0, then into the jmpbuf pointed to by r3 (first arg)
 121 +       mflr 0
 122 +       stw 0, 0(3)
 123 +       # 1) store reg1 (SP)
 124 +       stw 1, 4(3)
 125 +       # 2) store cr
 126 +       mfcr 0
 127 +       stw 0, 8(3)
 128 +       # 3) store r14-31
 129 +       stw 14, 12(3)
 130 +       stw 15, 16(3)
 131 +       stw 16, 20(3)
 132 +       stw 17, 24(3)
 133 +       stw 18, 28(3)
 134 +       stw 19, 32(3)
 135 +       stw 20, 36(3)
 136 +       stw 21, 40(3)
 137 +       stw 22, 44(3)
 138 +       stw 23, 48(3)
 139 +       stw 24, 52(3)
 140 +       stw 25, 56(3)
 141 +       stw 26, 60(3)
 142 +       stw 27, 64(3)
 143 +       stw 28, 68(3)
 144 +       stw 29, 72(3)
 145 +       stw 30, 76(3)
 146 +       stw 31, 80(3)
 147 +       # 4) set return value to 0
 148 +       li 3, 0
 149 +       # 5) return
 150 +       blr
 151 --- /dev/null
 152 +++ b/src/setjmp/powerpc-sf/setjmp.sub
 153 @@ -0,0 +1 @@
 154 +setjmp.s