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openrisc: entry: Whitespace and comment cleanups 

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 <shorne@gmail.com>
This commit is contained in:
Stafford Horne 2017-01-10 23:13:45 +09:00
parent f72deab378
commit 2ead7aba44
1 changed files with 18 additions and 20 deletions
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38
arch/openrisc/kernel/entry.S
View File

@ -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 ]----------------------------------------- */