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-rw-r--r--arch/mips/kernel/branch.c29
1 files changed, 25 insertions, 4 deletions
diff --git a/arch/mips/kernel/branch.c b/arch/mips/kernel/branch.c
index 01117e977a7..374de839558 100644
--- a/arch/mips/kernel/branch.c
+++ b/arch/mips/kernel/branch.c
@@ -12,6 +12,7 @@
#include <asm/branch.h>
#include <asm/cpu.h>
#include <asm/cpu-features.h>
+#include <asm/fpu.h>
#include <asm/inst.h>
#include <asm/ptrace.h>
#include <asm/uaccess.h>
@@ -21,7 +22,7 @@
*/
int __compute_return_epc(struct pt_regs *regs)
{
- unsigned int *addr, bit, fcr31;
+ unsigned int *addr, bit, fcr31, dspcontrol;
long epc;
union mips_instruction insn;
@@ -98,6 +99,18 @@ int __compute_return_epc(struct pt_regs *regs)
epc += 8;
regs->cp0_epc = epc;
break;
+ case bposge32_op:
+ if (!cpu_has_dsp)
+ goto sigill;
+
+ dspcontrol = rddsp(0x01);
+
+ if (dspcontrol >= 32) {
+ epc = epc + 4 + (insn.i_format.simmediate << 2);
+ } else
+ epc += 8;
+ regs->cp0_epc = epc;
+ break;
}
break;
@@ -161,10 +174,13 @@ int __compute_return_epc(struct pt_regs *regs)
* And now the FPA/cp1 branch instructions.
*/
case cop1_op:
- if (!cpu_has_fpu)
- fcr31 = current->thread.fpu.soft.fcr31;
- else
+ preempt_disable();
+ if (is_fpu_owner())
asm volatile("cfc1\t%0,$31" : "=r" (fcr31));
+ else
+ fcr31 = current->thread.fpu.hard.fcr31;
+ preempt_enable();
+
bit = (insn.i_format.rt >> 2);
bit += (bit != 0);
bit += 23;
@@ -196,4 +212,9 @@ unaligned:
printk("%s: unaligned epc - sending SIGBUS.\n", current->comm);
force_sig(SIGBUS, current);
return -EFAULT;
+
+sigill:
+ printk("%s: DSP branch but not DSP ASE - sending SIGBUS.\n", current->comm);
+ force_sig(SIGBUS, current);
+ return -EFAULT;
}