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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-06-26 13:42:02 (GMT) |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-07-02 09:56:11 (GMT) |
| commit | 0d147db0c127c561f8f9ead9f3c1ec38f89f1040 (patch) | |
| tree | ed499217d06bd42fc70bfcd7d3c0ae8ee05bc0b8 /arch/arm/mm/abort-lv4t.S | |
| parent | 3e287bec6fde088bff05ee7f998f53e8ac75b922 (diff) | |
| download | linux-0d147db0c127c561f8f9ead9f3c1ec38f89f1040.tar.xz | |
ARM: entry: data abort: avoid using r2 in abort helpers
This allows us to pass the pt_regs pointer in to these functions
ready for tail-calling the abort handler.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/abort-lv4t.S')
| -rw-r--r-- | arch/arm/mm/abort-lv4t.S | 34 |
1 files changed, 17 insertions, 17 deletions
diff --git a/arch/arm/mm/abort-lv4t.S b/arch/arm/mm/abort-lv4t.S index fea7514..d032b1f 100644 --- a/arch/arm/mm/abort-lv4t.S +++ b/arch/arm/mm/abort-lv4t.S @@ -64,12 +64,12 @@ ENTRY(v4t_late_abort) mov r7, #0x11 orr r7, r7, #0x1100 and r6, r8, r7 - and r2, r8, r7, lsl #1 - add r6, r6, r2, lsr #1 - and r2, r8, r7, lsl #2 - add r6, r6, r2, lsr #2 - and r2, r8, r7, lsl #3 - add r6, r6, r2, lsr #3 + and r9, r8, r7, lsl #1 + add r6, r6, r9, lsr #1 + and r9, r8, r7, lsl #2 + add r6, r6, r9, lsr #2 + and r9, r8, r7, lsl #3 + add r6, r6, r9, lsr #3 add r6, r6, r6, lsr #8 add r6, r6, r6, lsr #4 and r6, r6, #15 @ r6 = no. of registers to transfer. @@ -103,13 +103,13 @@ ENTRY(v4t_late_abort) tst r8, #1 << 21 @ check writeback bit moveq pc, lr @ no writeback -> no fixup .data_arm_lateldrpostconst: - movs r2, r8, lsl #20 @ Get offset + movs r9, r8, lsl #20 @ Get offset moveq pc, lr @ zero -> no fixup and r5, r8, #15 << 16 @ Extract 'n' from instruction ldr r7, [sp, r5, lsr #14] @ Get register 'Rn' tst r8, #1 << 23 @ Check U bit - subne r7, r7, r2, lsr #20 @ Undo increment - addeq r7, r7, r2, lsr #20 @ Undo decrement + subne r7, r7, r9, lsr #20 @ Undo increment + addeq r7, r7, r9, lsr #20 @ Undo decrement str r7, [sp, r5, lsr #14] @ Put register 'Rn' mov pc, lr @@ -194,11 +194,11 @@ ENTRY(v4t_late_abort) tst r8, #1 << 10 beq .data_unknown and r6, r8, #0x55 @ hweight8(r8) + R bit - and r2, r8, #0xaa - add r6, r6, r2, lsr #1 - and r2, r6, #0xcc + and r9, r8, #0xaa + add r6, r6, r9, lsr #1 + and r9, r6, #0xcc and r6, r6, #0x33 - add r6, r6, r2, lsr #2 + add r6, r6, r9, lsr #2 movs r7, r8, lsr #9 @ C = r8 bit 8 (R bit) adc r6, r6, r6, lsr #4 @ high + low nibble + R bit and r6, r6, #15 @ number of regs to transfer @@ -211,11 +211,11 @@ ENTRY(v4t_late_abort) .data_thumb_ldmstm: and r6, r8, #0x55 @ hweight8(r8) - and r2, r8, #0xaa - add r6, r6, r2, lsr #1 - and r2, r6, #0xcc + and r9, r8, #0xaa + add r6, r6, r9, lsr #1 + and r9, r6, #0xcc and r6, r6, #0x33 - add r6, r6, r2, lsr #2 + add r6, r6, r9, lsr #2 add r6, r6, r6, lsr #4 and r5, r8, #7 << 8 ldr r7, [sp, r5, lsr #6] |