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powerpc: Emulation support for load/store instructions on LE

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commit e148bd17f4 upstream.

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.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ravi Bangoria
2017-02-14 14:46:42 +05:30
committed by Greg Kroah-Hartman
parent ac4666a7fd
commit bc8d2eefe6
1 changed files with 0 additions and 20 deletions
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20
arch/powerpc/lib/sstep.c
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@@ -1807,8 +1807,6 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
goto instr_done; goto instr_done;
case LARX: case LARX:
if (regs->msr & MSR_LE)
return 0;
if (op.ea & (size - 1)) if (op.ea & (size - 1))
break; /* can't handle misaligned */ break; /* can't handle misaligned */
err = -EFAULT; err = -EFAULT;
@@ -1832,8 +1830,6 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
goto ldst_done; goto ldst_done;
case STCX: case STCX:
if (regs->msr & MSR_LE)
return 0;
if (op.ea & (size - 1)) if (op.ea & (size - 1))
break; /* can't handle misaligned */ break; /* can't handle misaligned */
err = -EFAULT; err = -EFAULT;
@@ -1859,8 +1855,6 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
goto ldst_done; goto ldst_done;
case LOAD: case LOAD:
if (regs->msr & MSR_LE)
return 0;
err = read_mem(&regs->gpr[op.reg], op.ea, size, regs); err = read_mem(&regs->gpr[op.reg], op.ea, size, regs);
if (!err) { if (!err) {
if (op.type & SIGNEXT) if (op.type & SIGNEXT)
@@ -1872,8 +1866,6 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
#ifdef CONFIG_PPC_FPU #ifdef CONFIG_PPC_FPU
case LOAD_FP: case LOAD_FP:
if (regs->msr & MSR_LE)
return 0;
if (size == 4) if (size == 4)
err = do_fp_load(op.reg, do_lfs, op.ea, size, regs); err = do_fp_load(op.reg, do_lfs, op.ea, size, regs);
else else
@@ -1882,15 +1874,11 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
#endif #endif
#ifdef CONFIG_ALTIVEC #ifdef CONFIG_ALTIVEC
case LOAD_VMX: case LOAD_VMX:
if (regs->msr & MSR_LE)
return 0;
err = do_vec_load(op.reg, do_lvx, op.ea & ~0xfUL, regs); err = do_vec_load(op.reg, do_lvx, op.ea & ~0xfUL, regs);
goto ldst_done; goto ldst_done;
#endif #endif
#ifdef CONFIG_VSX #ifdef CONFIG_VSX
case LOAD_VSX: case LOAD_VSX:
if (regs->msr & MSR_LE)
return 0;
err = do_vsx_load(op.reg, do_lxvd2x, op.ea, regs); err = do_vsx_load(op.reg, do_lxvd2x, op.ea, regs);
goto ldst_done; goto ldst_done;
#endif #endif
@@ -1913,8 +1901,6 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
goto instr_done; goto instr_done;
case STORE: case STORE:
if (regs->msr & MSR_LE)
return 0;
if ((op.type & UPDATE) && size == sizeof(long) && if ((op.type & UPDATE) && size == sizeof(long) &&
op.reg == 1 && op.update_reg == 1 && op.reg == 1 && op.update_reg == 1 &&
!(regs->msr & MSR_PR) && !(regs->msr & MSR_PR) &&
@@ -1927,8 +1913,6 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
#ifdef CONFIG_PPC_FPU #ifdef CONFIG_PPC_FPU
case STORE_FP: case STORE_FP:
if (regs->msr & MSR_LE)
return 0;
if (size == 4) if (size == 4)
err = do_fp_store(op.reg, do_stfs, op.ea, size, regs); err = do_fp_store(op.reg, do_stfs, op.ea, size, regs);
else else
@@ -1937,15 +1921,11 @@ int __kprobes emulate_step(struct pt_regs *regs, unsigned int instr)
#endif #endif
#ifdef CONFIG_ALTIVEC #ifdef CONFIG_ALTIVEC
case STORE_VMX: case STORE_VMX:
if (regs->msr & MSR_LE)
return 0;
err = do_vec_store(op.reg, do_stvx, op.ea & ~0xfUL, regs); err = do_vec_store(op.reg, do_stvx, op.ea & ~0xfUL, regs);
goto ldst_done; goto ldst_done;
#endif #endif
#ifdef CONFIG_VSX #ifdef CONFIG_VSX
case STORE_VSX: case STORE_VSX:
if (regs->msr & MSR_LE)
return 0;
err = do_vsx_store(op.reg, do_stxvd2x, op.ea, regs); err = do_vsx_store(op.reg, do_stxvd2x, op.ea, regs);
goto ldst_done; goto ldst_done;
#endif #endif