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Diffstat (limited to 'arch/sh/kernel/cpu/sh4/fpu.c')
-rw-r--r--arch/sh/kernel/cpu/sh4/fpu.c25
1 files changed, 24 insertions, 1 deletions
diff --git a/arch/sh/kernel/cpu/sh4/fpu.c b/arch/sh/kernel/cpu/sh4/fpu.c
index 2d452f67fb87..2780917c0088 100644
--- a/arch/sh/kernel/cpu/sh4/fpu.c
+++ b/arch/sh/kernel/cpu/sh4/fpu.c
@@ -36,7 +36,7 @@ extern unsigned long int float32_add(unsigned long int a, unsigned long int b);
extern unsigned long long float64_sub(unsigned long long a,
unsigned long long b);
extern unsigned long int float32_sub(unsigned long int a, unsigned long int b);
-
+extern unsigned long int float64_to_float32(unsigned long long a);
static unsigned int fpu_exception_flags;
/*
@@ -417,6 +417,29 @@ static int ieee_fpe_handler(struct pt_regs *regs)
regs->pc = nextpc;
return 1;
+ } else if ((finsn & 0xf0bd) == 0xf0bd) {
+ /* fcnvds - double to single precision convert */
+ struct task_struct *tsk = current;
+ int m;
+ unsigned int hx;
+
+ m = (finsn >> 9) & 0x7;
+ hx = tsk->thread.fpu.hard.fp_regs[m];
+
+ if ((tsk->thread.fpu.hard.fpscr & FPSCR_CAUSE_ERROR)
+ && ((hx & 0x7fffffff) < 0x00100000)) {
+ /* subnormal double to float conversion */
+ long long llx;
+
+ llx = ((long long)tsk->thread.fpu.hard.fp_regs[m] << 32)
+ | tsk->thread.fpu.hard.fp_regs[m + 1];
+
+ tsk->thread.fpu.hard.fpul = float64_to_float32(llx);
+ } else
+ return 0;
+
+ regs->pc = nextpc;
+ return 1;
}
return 0;