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powerpc fixes for 4.11 #8

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Just two fixes. The first fixes kprobing a stdu, and is marked for stable as
 it's been broken for ~ever. In hindsight this could have gone in next.
 
 The other is a fix for a change we merged this cycle, where if we take a certain
 exception when the kernel is running relocated (currently only used for kdump),
 we checkstop the box.
 
 Thanks to:
   Ravi Bangoria.
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Merge tag 'powerpc-4.11-8' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc fixes from Michael Ellerman:
 "Just two fixes.

  The first fixes kprobing a stdu, and is marked for stable as it's been
  broken for ~ever. In hindsight this could have gone in next.

  The other is a fix for a change we merged this cycle, where if we take
  a certain exception when the kernel is running relocated (currently
  only used for kdump), we checkstop the box.

  Thanks to Ravi Bangoria"

* tag 'powerpc-4.11-8' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
  powerpc/64: Fix HMI exception on LE with CONFIG_RELOCATABLE=y
  powerpc/kprobe: Fix oops when kprobed on 'stdu' instruction
This commit is contained in:
Linus Torvalds 2017-04-21 09:34:45 -07:00
commit 92b4fc7563
3 changed files with 8 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/powerpc/include/asm/exception-64s.h
View File

@ -236,9 +236,9 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
mtctr reg; \
bctr
#define BRANCH_LINK_TO_FAR(reg, label) \
__LOAD_FAR_HANDLER(reg, label); \
mtctr reg; \
#define BRANCH_LINK_TO_FAR(label) \
__LOAD_FAR_HANDLER(r12, label); \
mtctr r12; \
bctrl
/*
@ -265,7 +265,7 @@ END_FTR_SECTION_NESTED(ftr,ftr,943)
#define BRANCH_TO_COMMON(reg, label) \
b label
#define BRANCH_LINK_TO_FAR(reg, label) \
#define BRANCH_LINK_TO_FAR(label) \
bl label
#define BRANCH_TO_KVM(reg, label) \

6
arch/powerpc/kernel/entry_64.S
View File

@ -689,7 +689,7 @@ resume_kernel:
addi r8,r1,INT_FRAME_SIZE /* Get the kprobed function entry */
lwz r3,GPR1(r1)
ld r3,GPR1(r1)
subi r3,r3,INT_FRAME_SIZE /* dst: Allocate a trampoline exception frame */
mr r4,r1 /* src: current exception frame */
mr r1,r3 /* Reroute the trampoline frame to r1 */
@ -703,8 +703,8 @@ resume_kernel:
addi r6,r6,8
bdnz 2b
/* Do real store operation to complete stwu */
lwz r5,GPR1(r1)
/* Do real store operation to complete stdu */
ld r5,GPR1(r1)
std r8,0(r5)
/* Clear _TIF_EMULATE_STACK_STORE flag */

2
arch/powerpc/kernel/exceptions-64s.S
View File

@ -982,7 +982,7 @@ TRAMP_REAL_BEGIN(hmi_exception_early)
EXCEPTION_PROLOG_COMMON_2(PACA_EXGEN)
EXCEPTION_PROLOG_COMMON_3(0xe60)
addi r3,r1,STACK_FRAME_OVERHEAD
BRANCH_LINK_TO_FAR(r4, hmi_exception_realmode)
BRANCH_LINK_TO_FAR(hmi_exception_realmode) /* Function call ABI */
/* Windup the stack. */
/* Move original HSRR0 and HSRR1 into the respective regs */
ld r9,_MSR(r1)