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Patch "powerpc: Emulation support for load/store instructions on LE" has been added to the 4.9-stable tree

PATCH [email protected] 1 participant 1 message Mar 15, 2017

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This is a note to let you know that I've just added the patch titled

powerpc: Emulation support for load/store instructions on LE

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
powerpc-emulation-support-for-load-store-instructions-on-le.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

Quoted 1 line

From e148bd17f48bd17fca2f4f089ec879fa6e47e34c Mon Sep 17 00:00:00 2001

From: Ravi Bangoria <[email protected]>
Date: Tue, 14 Feb 2017 14:46:42 +0530
Subject: powerpc: Emulation support for load/store instructions on LE

From: Ravi Bangoria <[email protected]>

commit e148bd17f48bd17fca2f4f089ec879fa6e47e34c 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 <[email protected]>
Signed-off-by Ravi Bangoria <[email protected]>
Signed-off-by Michael Ellerman <[email protected]>
Signed-off-by Greg Kroah-Hartman <[email protected]>
---
 arch/powerpc/lib/sstep.c |   20 --------------------
 1 file changed, 20 deletions(-)
arch/powerpc/lib/sstep.c +0 -20
@@ -1807,8 +1807,6 @@ int __kprobes emulate_step(struct pt_reg
 		goto instr_done;
 
 	case LARX:
-		if (regs->msr & MSR_LE)
-			return 0;
 		if (op.ea & (size - 1))
 			break;		/* can't handle misaligned */
 		err = -EFAULT;

@@ -1832,8 +1830,6 @@ int __kprobes emulate_step(struct pt_reg
 		goto ldst_done;
 
 	case STCX:
-		if (regs->msr & MSR_LE)
-			return 0;
 		if (op.ea & (size - 1))
 			break;		/* can't handle misaligned */
 		err = -EFAULT;

@@ -1859,8 +1855,6 @@ int __kprobes emulate_step(struct pt_reg
 		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)

@@ -1872,8 +1866,6 @@ int __kprobes emulate_step(struct pt_reg
 
 #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

@@ -1882,15 +1874,11 @@ int __kprobes emulate_step(struct pt_reg
 #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

@@ -1913,8 +1901,6 @@ int __kprobes emulate_step(struct pt_reg
 		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) &&

@@ -1927,8 +1913,6 @@ int __kprobes emulate_step(struct pt_reg
 
 #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

@@ -1937,15 +1921,11 @@ int __kprobes emulate_step(struct pt_reg
 #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

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/powerpc-emulation-support-for-load-store-instructions-on-le.patch