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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-06-26 17:01:26 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2011-07-02 11:56:11 +0200 |
| commit | da7404725781bc7c736e10cae5521e5604e222a5 (patch) | |
| tree | e816cd79e1b09ddcbd41b7cd5b3c6c9c9bd5eb98 /arch/arm/mm/proc-arm6_7.S | |
| parent | ARM: entry: data abort: avoid using r2 in abort helpers (diff) | |
| download | linux-da7404725781bc7c736e10cae5521e5604e222a5.tar.xz linux-da7404725781bc7c736e10cae5521e5604e222a5.zip | |
ARM: entry: data abort: tail-call the main data abort handler
Tail-call the main C data abort handler code from the per-CPU helper
code. Update the comments in the code wrt the new calling and return
register state.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/proc-arm6_7.S')
| -rw-r--r-- | arch/arm/mm/proc-arm6_7.S | 29 |
1 files changed, 14 insertions, 15 deletions
diff --git a/arch/arm/mm/proc-arm6_7.S b/arch/arm/mm/proc-arm6_7.S index d4c328ecf3ba..d755d5b83898 100644 --- a/arch/arm/mm/proc-arm6_7.S +++ b/arch/arm/mm/proc-arm6_7.S @@ -29,7 +29,8 @@ ENTRY(cpu_arm7_dcache_clean_area) /* * Function: arm6_7_data_abort () * - * Params : r4 = aborted context pc + * Params : r2 = pt_regs + * : r4 = aborted context pc * : r5 = aborted context psr * * Purpose : obtain information about current aborted instruction @@ -49,7 +50,7 @@ ENTRY(cpu_arm7_data_abort) nop /* 0 */ b .data_unknown -/* 1 */ mov pc, lr @ swp +/* 1 */ b do_DataAbort @ swp /* 2 */ b .data_unknown /* 3 */ b .data_unknown /* 4 */ b .data_arm_lateldrpostconst @ ldr rd, [rn], #m @@ -60,16 +61,14 @@ ENTRY(cpu_arm7_data_abort) /* 9 */ b .data_arm_ldmstm @ ldm*b rn, <rlist> /* a */ b .data_unknown /* b */ b .data_unknown -/* c */ mov pc, lr @ ldc rd, [rn], #m @ Same as ldr rd, [rn], #m -/* d */ mov pc, lr @ ldc rd, [rn, #m] +/* c */ b do_DataAbort @ ldc rd, [rn], #m @ Same as ldr rd, [rn], #m +/* d */ b do_DataAbort @ ldc rd, [rn, #m] /* e */ b .data_unknown /* f */ .data_unknown: @ Part of jumptable mov r0, r4 mov r1, r8 - mov r2, sp - bl baddataabort - b ret_from_exception + b baddataabort ENTRY(cpu_arm6_data_abort) mrc p15, 0, r1, c5, c0, 0 @ get FSR @@ -79,11 +78,11 @@ ENTRY(cpu_arm6_data_abort) orreq r1, r1, #1 << 11 @ yes. and r7, r8, #14 << 24 teq r7, #8 << 24 @ was it ldm/stm - movne pc, lr + bne do_DataAbort .data_arm_ldmstm: tst r8, #1 << 21 @ check writeback bit - moveq pc, lr @ no writeback -> no fixup + beq do_DataAbort @ no writeback -> no fixup mov r7, #0x11 orr r7, r7, #0x1100 and r6, r8, r7 @@ -102,7 +101,7 @@ ENTRY(cpu_arm6_data_abort) subne r7, r7, r6, lsl #2 @ Undo increment addeq r7, r7, r6, lsl #2 @ Undo decrement str r7, [sp, r5, lsr #14] @ Put register 'Rn' - mov pc, lr + b do_DataAbort .data_arm_apply_r6_and_rn: and r5, r8, #15 << 16 @ Extract 'n' from instruction @@ -111,25 +110,25 @@ ENTRY(cpu_arm6_data_abort) subne r7, r7, r6 @ Undo incrmenet addeq r7, r7, r6 @ Undo decrement str r7, [sp, r5, lsr #14] @ Put register 'Rn' - mov pc, lr + b do_DataAbort .data_arm_lateldrpreconst: tst r8, #1 << 21 @ check writeback bit - moveq pc, lr @ no writeback -> no fixup + beq do_DataAbort @ no writeback -> no fixup .data_arm_lateldrpostconst: movs r9, r8, lsl #20 @ Get offset - moveq pc, lr @ zero -> no fixup + beq do_DataAbort @ 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, 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 + b do_DataAbort .data_arm_lateldrprereg: tst r8, #1 << 21 @ check writeback bit - moveq pc, lr @ no writeback -> no fixup + beq do_DataAbort @ no writeback -> no fixup .data_arm_lateldrpostreg: and r7, r8, #15 @ Extract 'm' from instruction ldr r6, [sp, r7, lsl #2] @ Get register 'Rm' |