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runtime: fix arm5 softfloat

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R=dfc, ken2, rsc
CC=golang-dev
https://golang.org/cl/4446043
This commit is contained in:
Russ Cox 2011-04-17 14:16:26 -04:00
parent 0c6df25df1
commit 90d8c8a09f
1 changed files with 18 additions and 2 deletions
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20
src/pkg/runtime/arm/softfloat.c
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@ -91,6 +91,7 @@ static uint32
stepflt(uint32 *pc, uint32 *regs)
{
uint32 i, regd, regm, regn;
int32 delta;
uint32 *addr;
uint64 uval;
int64 sval;
@ -117,7 +118,7 @@ stepflt(uint32 *pc, uint32 *regs)
return 1;
}
if(i == 0xe08bb00d) {
// add sp to 11.
// add sp to r11.
// might be part of a large stack offset address
// (or might not, but again no harm done).
regs[11] += regs[13];
@ -134,6 +135,19 @@ stepflt(uint32 *pc, uint32 *regs)
runtime·printf("*** fpsr R[CPSR] = F[CPSR] %x\n", regs[CPSR]);
return 1;
}
if((i&0xff000000) == 0xea000000) {
// unconditional branch
// can happen in the middle of floating point
// if the linker decides it is time to lay down
// a sequence of instruction stream constants.
delta = i&0xffffff;
delta = (delta<<8) >> 8; // sign extend
if(trace)
runtime·printf("*** cpu PC += %x\n", (delta+2)*4);
return delta+2;
}
goto stage1;
stage1: // load/store regn is cpureg, regm is 8bit offset
@ -489,8 +503,10 @@ runtime·_sfloat2(uint32 *lr, uint32 r0)
uint32 skip;
skip = stepflt(lr, &r0);
if(skip == 0)
if(skip == 0) {
runtime·printf("sfloat2 %p %x\n", lr, *lr);
fabort(); // not ok to fail first instruction
}
lr += skip;
while(skip = stepflt(lr, &r0))