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author | Stuart Yoder <stuart.yoder@freescale.com> | 2012-07-16 09:06:48 (GMT) |
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committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-07-27 01:42:31 (GMT) |
commit | 1f8b0bc81ac283adcda68805e0e2f5108614db44 (patch) | |
tree | 87ba3db0978a194144738bb2f74e48434b7be730 /arch/powerpc | |
parent | bdc0077af574800d24318b6945cf2344e8dbb050 (diff) | |
download | linux-1f8b0bc81ac283adcda68805e0e2f5108614db44.tar.xz |
powerpc: Set stack limit properly in crit_transfer_to_handler
Commit 9778b696a0188ad3b3524b383953ee73b31b7b68 incorrectly
changes the code setting the stack limit on entry to the
kernel to mark the thread_info at the bottom of the stack
out of bounds anymore. This fixes it.
Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r-- | arch/powerpc/kernel/entry_32.S | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S index 5207d5a..ead5016 100644 --- a/arch/powerpc/kernel/entry_32.S +++ b/arch/powerpc/kernel/entry_32.S @@ -89,10 +89,14 @@ crit_transfer_to_handler: mfspr r0,SPRN_SRR1 stw r0,_SRR1(r11) + /* set the stack limit to the current stack + * and set the limit to protect the thread_info + * struct + */ mfspr r8,SPRN_SPRG_THREAD lwz r0,KSP_LIMIT(r8) stw r0,SAVED_KSP_LIMIT(r11) - CURRENT_THREAD_INFO(r0, r1) + rlwimi r0,r1,0,0,(31-THREAD_SHIFT) stw r0,KSP_LIMIT(r8) /* fall through */ #endif @@ -109,10 +113,14 @@ crit_transfer_to_handler: mfspr r0,SPRN_SRR1 stw r0,crit_srr1@l(0) + /* set the stack limit to the current stack + * and set the limit to protect the thread_info + * struct + */ mfspr r8,SPRN_SPRG_THREAD lwz r0,KSP_LIMIT(r8) stw r0,saved_ksp_limit@l(0) - CURRENT_THREAD_INFO(r0, r1) + rlwimi r0,r1,0,0,(31-THREAD_SHIFT) stw r0,KSP_LIMIT(r8) /* fall through */ #endif |