Cleanups to whitespace and add some comments. Reading through the delay
slot logic I noticed some things:
- Delay slot instructions were not indented
- Some comments are not lined up
- Use tabs and spaces consistent with other code
No functional change
Signed-off-by: Stafford Horne <sho...@gmail.com>
---
arch/openrisc/kernel/entry.S | 38 ++++++++++++++++++--------------------
1 file changed, 18 insertions(+), 20 deletions(-)
diff --git a/arch/openrisc/kernel/entry.S b/arch/openrisc/kernel/entry.S
index ba1a361..daae2a4 100644
--- a/arch/openrisc/kernel/entry.S
+++ b/arch/openrisc/kernel/entry.S
@@ -228,7 +228,7 @@ EXCEPTION_ENTRY(_data_page_fault_handler)
* DTLB miss handler in the CONFIG_GUARD_PROTECTED_CORE part
*/
#ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX
- l.lwz r6,PT_PC(r3) // address of an offending insn
+ l.lwz r6,PT_PC(r3) // address of an offending insn
l.lwz r6,0(r6) // instruction that caused pf
l.srli r6,r6,26 // check opcode for jump insn
@@ -244,49 +244,47 @@ EXCEPTION_ENTRY(_data_page_fault_handler)
l.bf 8f
l.sfeqi r6,0x12 // l.jalr
l.bf 8f
-
- l.nop
+ l.nop
l.j 9f
- l.nop
-8:
+ l.nop
- l.lwz r6,PT_PC(r3) // address of an offending insn
+8: // offending insn is in delay slot
+ l.lwz r6,PT_PC(r3) // address of an offending insn
l.addi r6,r6,4
l.lwz r6,0(r6) // instruction that caused pf
l.srli r6,r6,26 // get opcode
-9:
+9: // offending instruction opcode loaded in r6
#else
- l.mfspr r6,r0,SPR_SR // SR
-// l.lwz r6,PT_SR(r3) // ESR
- l.andi r6,r6,SPR_SR_DSX // check for delay slot exception
- l.sfeqi r6,0x1 // exception happened in delay slot
- l.bnf 7f
- l.lwz r6,PT_PC(r3) // address of an offending insn
+ l.mfspr r6,r0,SPR_SR // SR
+ l.andi r6,r6,SPR_SR_DSX // check for delay slot exception
+ l.sfeqi r6,0x1 // exception happened in delay slot
+ l.bnf 7f
+ l.lwz r6,PT_PC(r3) // address of an offending insn
- l.addi r6,r6,4 // offending insn is in delay slot
+ l.addi r6,r6,4 // offending insn is in delay slot
7:
l.lwz r6,0(r6) // instruction that caused pf
l.srli r6,r6,26 // check opcode for write access
#endif
- l.sfgeui r6,0x33 // check opcode for write access
+ l.sfgeui r6,0x33 // check opcode for write access
l.bnf 1f
l.sfleui r6,0x37
l.bnf 1f
l.ori r6,r0,0x1 // write access
l.j 2f
- l.nop
+ l.nop
1: l.ori r6,r0,0x0 // !write access
2:
/* call fault.c handler in or32/mm/fault.c */
l.jal do_page_fault
- l.nop
+ l.nop
l.j _ret_from_exception
- l.nop
+ l.nop
/* ---[ 0x400: Insn Page Fault exception ]------------------------------- */
EXCEPTION_ENTRY(_itlb_miss_page_fault_handler)
@@ -306,9 +304,9 @@ EXCEPTION_ENTRY(_insn_page_fault_handler)
/* call fault.c handler in or32/mm/fault.c */
l.jal do_page_fault
- l.nop
+ l.nop
l.j _ret_from_exception
- l.nop
+ l.nop
/* ---[ 0x500: Timer exception ]----------------------------------------- */
--
2.9.3
