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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "runtime.h"
// returns number of bytes that the fp instruction is occupying
static uint32
isfltinstr(uint32 *pc)
{
uint32 i;
uint32 c;
i = *pc;
c = i >> 25 & 7;
switch(c) {
case 6: // 110
//printf(" %p coproc multi: %x\n", pc, i);
return 4;
case 7: // 111
if (i>>24 & 1) return 0; // ignore swi
//printf(" %p coproc %x\n", pc, i);
return 4;
}
// lookahead for virtual instructions that span multiple arm instructions
c = ((*pc & 0x0f000000) >> 16) |
((*(pc + 1) & 0x0f000000) >> 20) |
((*(pc + 2) & 0x0f000000) >> 24);
if(c == 0x50d) {
//printf(" %p coproc const %x\n", pc, i);
return 12;
}
//printf(" %p %x\n", pc, i);
return 0;
}
#pragma textflag 7
uint32*
_sfloat2(uint32 *lr, uint32 r0)
{
uint32 skip;
//printf("softfloat: pre %p\n", lr);
while(skip = isfltinstr(lr))
lr += skip;
//printf(" post: %p\n", lr);
return lr;
}
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