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author | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-06-27 12:27:47 +0100 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-07-02 10:56:12 +0100 |
commit | 40f0b90a2f16f433f9afbfef4b7c312efb54e933 (patch) | |
tree | 70f9ba82308817eabc79f915babd33862d716506 /arch/arm/mm/abort-lv4t.S | |
parent | 108f6af0a82cf3b61f3ac6728e2241805a935b64 (diff) | |
download | kernel_goldelico_gta04-40f0b90a2f16f433f9afbfef4b7c312efb54e933.zip kernel_goldelico_gta04-40f0b90a2f16f433f9afbfef4b7c312efb54e933.tar.gz kernel_goldelico_gta04-40f0b90a2f16f433f9afbfef4b7c312efb54e933.tar.bz2 |
ARM: entry: data abort: ensure r5 is preserved by abort functions
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 | 48 |
1 files changed, 22 insertions, 26 deletions
diff --git a/arch/arm/mm/abort-lv4t.S b/arch/arm/mm/abort-lv4t.S index 54b6d27..f398258 100644 --- a/arch/arm/mm/abort-lv4t.S +++ b/arch/arm/mm/abort-lv4t.S @@ -7,11 +7,7 @@ * : r4 = aborted context pc * : r5 = aborted context psr * - * Returns : r0 = address of abort - * : r1 = FSR, bit 11 = write - * : r2-r8 = corrupted - * : r9 = preserved - * : sp = pointer to registers + * Returns : r4-r5, r10-r11, r13 preserved * * Purpose : obtain information about current aborted instruction. * Note: we read user space. This means we might cause a data @@ -72,30 +68,30 @@ ENTRY(v4t_late_abort) add r6, r6, r6, lsr #8 add r6, r6, r6, lsr #4 and r6, r6, #15 @ r6 = no. of registers to transfer. - and r5, r8, #15 << 16 @ Extract 'n' from instruction - ldr r7, [r2, r5, lsr #14] @ Get register 'Rn' + and r9, r8, #15 << 16 @ Extract 'n' from instruction + ldr r7, [r2, r9, lsr #14] @ Get register 'Rn' tst r8, #1 << 23 @ Check U bit subne r7, r7, r6, lsl #2 @ Undo increment addeq r7, r7, r6, lsl #2 @ Undo decrement - str r7, [r2, r5, lsr #14] @ Put register 'Rn' + str r7, [r2, r9, lsr #14] @ Put register 'Rn' b do_DataAbort .data_arm_lateldrhpre: tst r8, #1 << 21 @ Check writeback bit beq do_DataAbort @ No writeback -> no fixup .data_arm_lateldrhpost: - and r5, r8, #0x00f @ get Rm / low nibble of immediate value + and r9, r8, #0x00f @ get Rm / low nibble of immediate value tst r8, #1 << 22 @ if (immediate offset) andne r6, r8, #0xf00 @ { immediate high nibble - orrne r6, r5, r6, lsr #4 @ combine nibbles } else - ldreq r6, [r2, r5, lsl #2] @ { load Rm value } + orrne r6, r9, r6, lsr #4 @ combine nibbles } else + ldreq r6, [r2, r9, lsl #2] @ { load Rm value } .data_arm_apply_r6_and_rn: - and r5, r8, #15 << 16 @ Extract 'n' from instruction - ldr r7, [r2, r5, lsr #14] @ Get register 'Rn' + and r9, r8, #15 << 16 @ Extract 'n' from instruction + ldr r7, [r2, r9, lsr #14] @ Get register 'Rn' tst r8, #1 << 23 @ Check U bit subne r7, r7, r6 @ Undo incrmenet addeq r7, r7, r6 @ Undo decrement - str r7, [r2, r5, lsr #14] @ Put register 'Rn' + str r7, [r2, r9, lsr #14] @ Put register 'Rn' b do_DataAbort .data_arm_lateldrpreconst: @@ -104,12 +100,12 @@ ENTRY(v4t_late_abort) .data_arm_lateldrpostconst: movs r6, r8, lsl #20 @ Get offset beq do_DataAbort @ zero -> no fixup - and r5, r8, #15 << 16 @ Extract 'n' from instruction - ldr r7, [r2, r5, lsr #14] @ Get register 'Rn' + and r9, r8, #15 << 16 @ Extract 'n' from instruction + ldr r7, [r2, r9, lsr #14] @ Get register 'Rn' tst r8, #1 << 23 @ Check U bit subne r7, r7, r6, lsr #20 @ Undo increment addeq r7, r7, r6, lsr #20 @ Undo decrement - str r7, [r2, r5, lsr #14] @ Put register 'Rn' + str r7, [r2, r9, lsr #14] @ Put register 'Rn' b do_DataAbort .data_arm_lateldrprereg: @@ -118,14 +114,14 @@ ENTRY(v4t_late_abort) .data_arm_lateldrpostreg: and r7, r8, #15 @ Extract 'm' from instruction ldr r6, [r2, r7, lsl #2] @ Get register 'Rm' - mov r5, r8, lsr #7 @ get shift count - ands r5, r5, #31 + mov r9, r8, lsr #7 @ get shift count + ands r9, r9, #31 and r7, r8, #0x70 @ get shift type orreq r7, r7, #8 @ shift count = 0 add pc, pc, r7 nop - mov r6, r6, lsl r5 @ 0: LSL #!0 + mov r6, r6, lsl r9 @ 0: LSL #!0 b .data_arm_apply_r6_and_rn b .data_arm_apply_r6_and_rn @ 1: LSL #0 nop @@ -133,7 +129,7 @@ ENTRY(v4t_late_abort) nop b .data_unknown @ 3: MUL? nop - mov r6, r6, lsr r5 @ 4: LSR #!0 + mov r6, r6, lsr r9 @ 4: LSR #!0 b .data_arm_apply_r6_and_rn mov r6, r6, lsr #32 @ 5: LSR #32 b .data_arm_apply_r6_and_rn @@ -141,7 +137,7 @@ ENTRY(v4t_late_abort) nop b .data_unknown @ 7: MUL? nop - mov r6, r6, asr r5 @ 8: ASR #!0 + mov r6, r6, asr r9 @ 8: ASR #!0 b .data_arm_apply_r6_and_rn mov r6, r6, asr #32 @ 9: ASR #32 b .data_arm_apply_r6_and_rn @@ -149,7 +145,7 @@ ENTRY(v4t_late_abort) nop b .data_unknown @ B: MUL? nop - mov r6, r6, ror r5 @ C: ROR #!0 + mov r6, r6, ror r9 @ C: ROR #!0 b .data_arm_apply_r6_and_rn mov r6, r6, rrx @ D: RRX b .data_arm_apply_r6_and_rn @@ -216,9 +212,9 @@ ENTRY(v4t_late_abort) and r6, r6, #0x33 add r6, r6, r9, lsr #2 add r6, r6, r6, lsr #4 - and r5, r8, #7 << 8 - ldr r7, [r2, r5, lsr #6] + and r9, r8, #7 << 8 + ldr r7, [r2, r9, lsr #6] and r6, r6, #15 @ number of regs to transfer sub r7, r7, r6, lsl #2 @ always decrement - str r7, [r2, r5, lsr #6] + str r7, [r2, r9, lsr #6] b do_DataAbort |