ARM: OMAP2+: Fix l2dis_3630 for rodata

We don't want to write to .text section. Let's move l2dis_3630
to .data and access it via a pointer.

For calculating the offset, let's optimize out the add and do it
in ldr/str as suggested by Nicolas Pitre <nicolas.pitre@linaro.org>.

Cc: Kees Cook <keescook@chromium.org>
Cc: Laura Abbott <labbott@redhat.com>
Cc: Nishanth Menon <nm@ti.com>
Cc: Richard Woodruff <r-woodruff2@ti.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Tero Kristo <t-kristo@ti.com>
Cc: stable@vger.kernel.org # v4.0+
Acked-by: Nicolas Pitre <nico@linaro.org>
Cc: stable@vger.kernel.org # v4.0+
Fixes: 1e6b48116a95 ("ARM: mm: allow non-text sections to be
non-executable")
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/mach-omap2/sleep34xx.S b/arch/arm/mach-omap2/sleep34xx.S
index 787cfda7a9b3ed0131d7865db0ad330c37ea9d9b..5659d96b78d5eb565382e8fe53163424b97b4e26 100644 (file)
--- a/arch/arm/mach-omap2/sleep34xx.S
+++ b/arch/arm/mach-omap2/sleep34xx.S
@@ -86,8 +86,9 @@ ENTRY(enable_omap3630_toggle_l2_on_restore)
        stmfd   sp!, {lr}       @ save registers on stack
        /* Setup so that we will disable and enable l2 */
        mov     r1, #0x1
-       adrl    r2, l2dis_3630  @ may be too distant for plain adr
-       str     r1, [r2]
+       adrl    r3, l2dis_3630_offset   @ may be too distant for plain adr
+       ldr     r2, [r3]                @ value for offset
+       str     r1, [r2, r3]            @ write to l2dis_3630
        ldmfd   sp!, {pc}       @ restore regs and return
 ENDPROC(enable_omap3630_toggle_l2_on_restore)
 
@@ -415,7 +416,9 @@ ENTRY(omap3_restore)
        cmp     r2, #0x0        @ Check if target power state was OFF or RET
        bne     logic_l1_restore
 
-       ldr     r0, l2dis_3630
+       adr     r1, l2dis_3630_offset   @ address for offset
+       ldr     r0, [r1]                @ value for offset
+       ldr     r0, [r1, r0]            @ value at l2dis_3630
        cmp     r0, #0x1        @ should we disable L2 on 3630?
        bne     skipl2dis
        mrc     p15, 0, r0, c1, c0, 1
@@ -484,7 +487,9 @@ l2_inv_gp:
        mov     r12, #0x2
        smc     #0                      @ Call SMI monitor (smieq)
 logic_l1_restore:
-       ldr     r1, l2dis_3630
+       adr     r0, l2dis_3630_offset   @ adress for offset
+       ldr     r1, [r0]                @ value for offset
+       ldr     r1, [r0, r1]            @ value at l2dis_3630
        cmp     r1, #0x1                @ Test if L2 re-enable needed on 3630
        bne     skipl2reen
        mrc     p15, 0, r1, c1, c0, 1
@@ -513,6 +518,10 @@ control_stat:
        .word   CONTROL_STAT
 control_mem_rta:
        .word   CONTROL_MEM_RTA_CTRL
+l2dis_3630_offset:
+       .long   l2dis_3630 - .
+
+       .data
 l2dis_3630:
        .word   0