powerpc: Emulation support for load/store instructions on LE

emulate_step() uses a number of underlying kernel functions that were
initially not enabled for LE. This has been rectified since. So, fix
emulate_step() for LE for the corresponding instructions.

Cc: stable@vger.kernel.org # v3.18+
Reported-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Ravi Bangoria <ravi.bangoria@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 846dba2..9c542ec 100644 (file)
--- a/arch/powerpc/lib/sstep.c
+++ b/arch/powerpc/lib/sstep.c
@@ -1799,8 +1799,6 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
                goto instr_done;
 
        case LARX:
-               if (regs->msr & MSR_LE)
-                       return 0;
                if (op.ea & (size - 1))
                        break;          /* can't handle misaligned */
                if (!address_ok(regs, op.ea, size))
@@ -1823,8 +1821,6 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
                goto ldst_done;
 
        case STCX:
-               if (regs->msr & MSR_LE)
-                       return 0;
                if (op.ea & (size - 1))
                        break;          /* can't handle misaligned */
                if (!address_ok(regs, op.ea, size))
@@ -1849,8 +1845,6 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
                goto ldst_done;
 
        case LOAD:
-               if (regs->msr & MSR_LE)
-                       return 0;
                err = read_mem(&regs->gpr[op.reg], op.ea, size, regs);
                if (!err) {
                        if (op.type & SIGNEXT)
@@ -1862,8 +1856,6 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
 
 #ifdef CONFIG_PPC_FPU
        case LOAD_FP:
-               if (regs->msr & MSR_LE)
-                       return 0;
                if (size == 4)
                        err = do_fp_load(op.reg, do_lfs, op.ea, size, regs);
                else
@@ -1872,15 +1864,11 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
 #endif
 #ifdef CONFIG_ALTIVEC
        case LOAD_VMX:
-               if (regs->msr & MSR_LE)
-                       return 0;
                err = do_vec_load(op.reg, do_lvx, op.ea & ~0xfUL, regs);
                goto ldst_done;
 #endif
 #ifdef CONFIG_VSX
        case LOAD_VSX:
-               if (regs->msr & MSR_LE)
-                       return 0;
                err = do_vsx_load(op.reg, do_lxvd2x, op.ea, regs);
                goto ldst_done;
 #endif
@@ -1903,8 +1891,6 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
                goto instr_done;
 
        case STORE:
-               if (regs->msr & MSR_LE)
-                       return 0;
                if ((op.type & UPDATE) && size == sizeof(long) &&
                    op.reg == 1 && op.update_reg == 1 &&
                    !(regs->msr & MSR_PR) &&
@@ -1917,8 +1903,6 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
 
 #ifdef CONFIG_PPC_FPU
        case STORE_FP:
-               if (regs->msr & MSR_LE)
-                       return 0;
                if (size == 4)
                        err = do_fp_store(op.reg, do_stfs, op.ea, size, regs);
                else
@@ -1927,15 +1911,11 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
 #endif
 #ifdef CONFIG_ALTIVEC
        case STORE_VMX:
-               if (regs->msr & MSR_LE)
-                       return 0;
                err = do_vec_store(op.reg, do_stvx, op.ea & ~0xfUL, regs);
                goto ldst_done;
 #endif
 #ifdef CONFIG_VSX
        case STORE_VSX:
-               if (regs->msr & MSR_LE)
-                       return 0;
                err = do_vsx_store(op.reg, do_stxvd2x, op.ea, regs);
                goto ldst_done;
 #endif