diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-08-27 11:37:58 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-08-28 10:39:53 +0100 |
| commit | 6f354e5f40f433da98fab4103cd3a0aef1c18bde (patch) | |
| tree | a8bc5472da31021ee456870ea41b63be1f0bb5e7 /arch/arm/mm/proc-xsc3.S | |
| parent | 0f81bb6b051ad760686b5b0fef8c731282c16ef5 (diff) | |
| download | linux-6f354e5f40f433da98fab4103cd3a0aef1c18bde.tar.gz linux-6f354e5f40f433da98fab4103cd3a0aef1c18bde.tar.bz2 linux-6f354e5f40f433da98fab4103cd3a0aef1c18bde.zip | |
ARM: pm: CPU specific code should not overwrite r1 (v:p offset)
r1 stores the v:p offset from the CPU invariant resume code, and is
expected to be preserved by the CPU specific code. Overwriting it is
not a good idea.
We've managed to get away with it on sa1100 platforms because most
happen to have PHYS_OFFSET == PAGE_OFFSET, but that may not be the
case depending on kernel configuration. So fix this latent bug.
This fixes xsc3 as well which was saving and restoring this register
independently.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/proc-xsc3.S')
| -rw-r--r-- | arch/arm/mm/proc-xsc3.S | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/arm/mm/proc-xsc3.S b/arch/arm/mm/proc-xsc3.S index 28c72a2006a1..755e1bf22681 100644 --- a/arch/arm/mm/proc-xsc3.S +++ b/arch/arm/mm/proc-xsc3.S @@ -406,7 +406,7 @@ ENTRY(cpu_xsc3_set_pte_ext) .align .globl cpu_xsc3_suspend_size -.equ cpu_xsc3_suspend_size, 4 * 8 +.equ cpu_xsc3_suspend_size, 4 * 7 #ifdef CONFIG_PM_SLEEP ENTRY(cpu_xsc3_do_suspend) stmfd sp!, {r4 - r10, lr} @@ -418,12 +418,12 @@ ENTRY(cpu_xsc3_do_suspend) mrc p15, 0, r9, c1, c0, 1 @ auxiliary control reg mrc p15, 0, r10, c1, c0, 0 @ control reg bic r4, r4, #2 @ clear frequency change bit - stmia r0, {r1, r4 - r10} @ store v:p offset + cp regs + stmia r0, {r4 - r10} @ store cp regs ldmia sp!, {r4 - r10, pc} ENDPROC(cpu_xsc3_do_suspend) ENTRY(cpu_xsc3_do_resume) - ldmia r0, {r1, r4 - r10} @ load v:p offset + cp regs + ldmia r0, {r4 - r10} @ load cp regs mov ip, #0 mcr p15, 0, ip, c7, c7, 0 @ invalidate I & D caches, BTB mcr p15, 0, ip, c7, c10, 4 @ drain write (&fill) buffer |