From: David Daney <david.daney@xxxxxxxxxx>
Introduce __compute_return_epc_for_insn0() entry point.
Signed-off-by: David Daney <david.daney@xxxxxxxxxx>
---
arch/mips/include/asm/branch.h | 7 +++++
arch/mips/kernel/branch.c | 63 +++++++++++++++++++++++++++++++-----------
2 files changed, 54 insertions(+), 16 deletions(-)
diff --git a/arch/mips/include/asm/branch.h b/arch/mips/include/asm/branch.h
index e28a3e0..b3de685 100644
--- a/arch/mips/include/asm/branch.h
+++ b/arch/mips/include/asm/branch.h
@@ -37,6 +37,13 @@ static inline unsigned long exception_epc(struct pt_regs *regs)
#define BRANCH_LIKELY_TAKEN 0x0001
+extern int __compute_return_epc(struct pt_regs *regs);
+extern int __compute_return_epc_for_insn(struct pt_regs *regs,
+ union mips_instruction insn);
+extern int __compute_return_epc_for_insn0(struct pt_regs *regs,
+ union mips_instruction insn,
+ unsigned int (*get_fcr31)(void));
+
static inline int compute_return_epc(struct pt_regs *regs)
{
if (get_isa16_mode(regs->cp0_epc)) {
diff --git a/arch/mips/kernel/branch.c b/arch/mips/kernel/branch.c
index 46c2ad0..e47145b 100644
--- a/arch/mips/kernel/branch.c
+++ b/arch/mips/kernel/branch.c
@@ -195,17 +195,18 @@ int __MIPS16e_compute_return_epc(struct pt_regs *regs)
}
/**
- * __compute_return_epc_for_insn - Computes the return address and do emulate
+ * __compute_return_epc_for_insn0 - Computes the return address and do emulate
* branch simulation, if required.
*
* @regs: Pointer to pt_regs
* @insn: branch instruction to decode
- * @returns: -EFAULT on error and forces SIGBUS, and on success
+ * @returns: -EFAULT on error, and on success
* returns 0 or BRANCH_LIKELY_TAKEN as appropriate after
* evaluating the branch.
*/
-int __compute_return_epc_for_insn(struct pt_regs *regs,
- union mips_instruction insn)
+int __compute_return_epc_for_insn0(struct pt_regs *regs,
+ union mips_instruction insn,
+ unsigned int (*get_fcr31)(void))
{
unsigned int bit, fcr31, dspcontrol;
long epc = regs->cp0_epc;
@@ -281,7 +282,7 @@ int __compute_return_epc_for_insn(struct pt_regs *regs,
case bposge32_op:
if (!cpu_has_dsp)
- goto sigill;
+ return -EFAULT;
dspcontrol = rddsp(0x01);
@@ -364,13 +365,7 @@ int __compute_return_epc_for_insn(struct pt_regs *regs,
* And now the FPA/cp1 branch instructions.
*/
case cop1_op:
- preempt_disable();
- if (is_fpu_owner())
- asm volatile("cfc1\t%0,$31" : "=r" (fcr31));
- else
- fcr31 = current->thread.fpu.fcr31;
- preempt_enable();
-
+ fcr31 = get_fcr31();
bit = (insn.i_format.rt >> 2);
bit += (bit != 0);
bit += 23;
@@ -434,11 +429,47 @@ int __compute_return_epc_for_insn(struct pt_regs *regs,
}
return ret;
+}
+EXPORT_SYMBOL_GPL(__compute_return_epc_for_insn0);
-sigill:
- printk("%s: DSP branch but not DSP ASE - sending SIGBUS.\n", current->comm);
- force_sig(SIGBUS, current);
- return -EFAULT;
+static unsigned int __get_fcr31(void)
+{
+ unsigned int fcr31;
+
+ preempt_disable();
+ if (is_fpu_owner())
+ asm volatile(
+ ".set push\n"
+ "\t.set mips1\n"
+ "\tcfc1\t%0,$31\n"
+ "\t.set pop" : "=r" (fcr31));
+ else
+ fcr31 = current->thread.fpu.fcr31;
+ preempt_enable();
+ return fcr31;
+}
+
+/**
+ * __compute_return_epc_for_insn - Computes the return address and do emulate
+ * branch simulation, if required.
+ *
+ * @regs: Pointer to pt_regs
+ * @insn: branch instruction to decode
+ * @returns: -EFAULT on error and forces SIGBUS, and on success
+ * returns 0 or BRANCH_LIKELY_TAKEN as appropriate after
+ * evaluating the branch.
+ */
+int __compute_return_epc_for_insn(struct pt_regs *regs,
+ union mips_instruction insn)
+{
+ int r = __compute_return_epc_for_insn0(regs, insn, __get_fcr31);
+
+ if (r < 0) {
+ printk("%s: DSP branch but not DSP ASE - sending SIGBUS.\n", current->comm);
+ force_sig(SIGBUS, current);
+ }
+
+ return r;
}
EXPORT_SYMBOL_GPL(__compute_return_epc_for_insn);
--
1.7.11.7
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