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OpenCloudOS-Kernel
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ARC: entry.S: common'ize scrtach reg freeup in intr + exceptions 

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Vineet Gupta 2014-10-13 15:12:25 +05:30
parent 11e14896ea
commit fbfa26ae3b
2 changed files with 18 additions and 27 deletions
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33
arch/arc/include/asm/entry.h
View File

@ -360,26 +360,26 @@
.endm
/*--------------------------------------------------------------
* For early Exception Prologue, a core reg is temporarily needed to
* For early Exception/ISR Prologue, a core reg is temporarily needed to
* code the rest of prolog (stack switching). This is done by stashing
* it to memory (non-SMP case) or SCRATCH0 Aux Reg (SMP).
*
* Before saving the full regfile - this reg is restored back, only
* to be saved again on kernel mode stack, as part of pt_regs.
*-------------------------------------------------------------*/
.macro EXCPN_PROLOG_FREEUP_REG reg
.macro PROLOG_FREEUP_REG reg, mem
#ifdef CONFIG_SMP
sr \reg, [ARC_REG_SCRATCH_DATA0]
#else
st \reg, [@ex_saved_reg1]
st \reg, [\mem]
#endif
.endm
.macro EXCPN_PROLOG_RESTORE_REG reg
.macro PROLOG_RESTORE_REG reg, mem
#ifdef CONFIG_SMP
lr \reg, [ARC_REG_SCRATCH_DATA0]
#else
ld \reg, [@ex_saved_reg1]
ld \reg, [\mem]
#endif
.endm
@ -393,7 +393,7 @@
.macro EXCEPTION_PROLOGUE
/* Need at least 1 reg to code the early exception prologue */
EXCPN_PROLOG_FREEUP_REG r9
PROLOG_FREEUP_REG r9, @ex_saved_reg1
/* U/K mode at time of exception (stack not switched if already K) */
lr r9, [erstatus]
@ -421,7 +421,7 @@
st r0, [sp, 4] /* orig_r0, needed only for sys calls */
/* Restore r9 used to code the early prologue */
EXCPN_PROLOG_RESTORE_REG r9
PROLOG_RESTORE_REG r9, @ex_saved_reg1
SAVE_R0_TO_R12
PUSH gp
@ -471,12 +471,8 @@
*-------------------------------------------------------------*/
.macro SAVE_ALL_INT1
/* restore original r9 to be saved as part of reg-file */
#ifdef CONFIG_SMP
lr r9, [ARC_REG_SCRATCH_DATA0]
#else
ld r9, [@int1_saved_reg]
#endif
/* restore original r9 */
PROLOG_RESTORE_REG r9, @int1_saved_reg
/* now we are ready to save the remaining context :) */
st event_IRQ1, [sp, 8] /* Dummy ECR */
@ -496,12 +492,13 @@
.macro SAVE_ALL_INT2
/* TODO-vineetg: SMP we can't use global nor can we use
* SCRATCH0 as we do for int1 because while int1 is using
* it, int2 can come
/*
* In SMP we can't use mem nor can we use SCRARCH_DATA0
* as we do for int1 because int2 can clobber it
* Hence 2 levels of intr are NOT allowed in SMP (by Kconfig)
*/
/* retsore original r9 , saved in sys_saved_r9 */
ld r9, [@int2_saved_reg]
/* restore original r9 */
PROLOG_RESTORE_REG r9, @int2_saved_reg
/* now we are ready to save the remaining context :) */
st event_IRQ2, [sp, 8] /* Dummy ECR */

10
arch/arc/kernel/entry.S
View File

@ -186,9 +186,8 @@ reserved: ; processor restart
; ---------------------------------------------
ENTRY(handle_interrupt_level2)
; TODO-vineetg for SMP this wont work
; free up r9 as scratchpad
st r9, [@int2_saved_reg]
PROLOG_FREEUP_REG r9, @int2_saved_reg
;Which mode (user/kernel) was the system in when intr occured
lr r9, [status32_l2]
@ -234,12 +233,7 @@ END(handle_interrupt_level2)
; ---------------------------------------------
ENTRY(handle_interrupt_level1)
/* free up r9 as scratchpad */
#ifdef CONFIG_SMP
sr r9, [ARC_REG_SCRATCH_DATA0]
#else
st r9, [@int1_saved_reg]
#endif
PROLOG_FREEUP_REG r9, @int1_saved_reg
;Which mode (user/kernel) was the system in when intr occured
lr r9, [status32_l1]