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| author | Vineet Gupta <vgupta@synopsys.com> | 2014-10-13 11:42:25 +0200 |
|---|---|---|
| committer | Vineet Gupta <vgupta@synopsys.com> | 2015-06-19 14:39:34 +0200 |
| commit | fbfa26ae3b2001d0885938175f9af5a4c50a528c (patch) | |
| tree | d98a145290cb48f8393bcc1888db747d86da07c0 /arch/arc/include/asm | |
| parent | ARC: untangle cache flush loop (diff) | |
| download | linux-fbfa26ae3b2001d0885938175f9af5a4c50a528c.tar.xz linux-fbfa26ae3b2001d0885938175f9af5a4c50a528c.zip | |
ARC: entry.S: common'ize scrtach reg freeup in intr + exceptions
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/include/asm')
| -rw-r--r-- | arch/arc/include/asm/entry.h | 35 |
1 files changed, 16 insertions, 19 deletions
diff --git a/arch/arc/include/asm/entry.h b/arch/arc/include/asm/entry.h index 884081099f80..9e844ab5eede 100644 --- a/arch/arc/include/asm/entry.h +++ b/arch/arc/include/asm/entry.h @@ -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 - */ - /* retsore original r9 , saved in sys_saved_r9 */ - ld r9, [@int2_saved_reg] + /* + * 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) + */ + /* 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 */ |