powerpc/lib/sstep: Fix fixed-point shift instructions that set CA32

This fixes the emulated behaviour of existing fixed-point shift right
algebraic instructions that are supposed to set both the CA and CA32
bits of XER when running on a system that is compliant with POWER ISA
v3.0 independent of whether the system is executing in 32-bit mode or
64-bit mode. The following instructions are affected:
  * Shift Right Algebraic Word Immediate (srawi[.])
  * Shift Right Algebraic Word (sraw[.])
  * Shift Right Algebraic Doubleword Immediate (sradi[.])
  * Shift Right Algebraic Doubleword (srad[.])

Fixes: 0016a4cf5582 ("powerpc: Emulate most Book I instructions in emulate_step()")
Signed-off-by: Sandipan Das <sandipan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c
index fe19107..5118110 100644 (file)
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -1804,6 +1804,7 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
                                op->xerval |= XER_CA;
                        else
                                op->xerval &= ~XER_CA;
+                       set_ca32(op, op->xerval & XER_CA);
                        goto logical_done;
 
                case 824:       /* srawi */
@@ -1816,6 +1817,7 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
                                op->xerval |= XER_CA;
                        else
                                op->xerval &= ~XER_CA;
+                       set_ca32(op, op->xerval & XER_CA);
                        goto logical_done;
 
 #ifdef __powerpc64__
@@ -1845,6 +1847,7 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
                                op->xerval |= XER_CA;
                        else
                                op->xerval &= ~XER_CA;
+                       set_ca32(op, op->xerval & XER_CA);
                        goto logical_done;
 
                case 826:       /* sradi with sh_5 = 0 */
@@ -1858,6 +1861,7 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs,
                                op->xerval |= XER_CA;
                        else
                                op->xerval &= ~XER_CA;
+                       set_ca32(op, op->xerval & XER_CA);
                        goto logical_done;
 #endif /* __powerpc64__ */