diff options
Diffstat (limited to 'arch/arc/include/asm/entry.h')
| -rw-r--r-- | arch/arc/include/asm/entry.h | 43 |
1 files changed, 20 insertions, 23 deletions
diff --git a/arch/arc/include/asm/entry.h b/arch/arc/include/asm/entry.h index 2cf6aa08cfc..72a7ed47117 100644 --- a/arch/arc/include/asm/entry.h +++ b/arch/arc/include/asm/entry.h @@ -102,6 +102,10 @@ POP r2 POP r1 POP r0 + +#ifdef CONFIG_ARC_CURR_IN_REG + ld r25, [sp, 12] +#endif .endm /*-------------------------------------------------------------- @@ -138,6 +142,7 @@ POP r13 .endm +#define OFF_USER_R25_FROM_R24 (SZ_CALLEE_REGS + SZ_PT_REGS - 8)/4 /*-------------------------------------------------------------- * Collect User Mode callee regs as struct callee_regs - needed by @@ -155,7 +160,7 @@ #ifdef CONFIG_ARC_CURR_IN_REG ; Retrieve orig r25 and save it on stack - ld r12, [r25, TASK_THREAD + THREAD_USER_R25] + ld.as r12, [sp, OFF_USER_R25_FROM_R24] st.a r12, [sp, -4] #else PUSH r25 @@ -204,7 +209,7 @@ #ifdef CONFIG_ARC_CURR_IN_REG ld.ab r12, [sp, 4] - st r12, [r25, TASK_THREAD + THREAD_USER_R25] + st.as r12, [sp, OFF_USER_R25_FROM_R24] #else POP r25 #endif @@ -218,13 +223,6 @@ add sp, sp, SZ_CALLEE_REGS .endm -/*-------------------------------------------------------------- - * Restore User mode r25 saved in task_struct->thread.user_r25 - *-------------------------------------------------------------*/ -.macro RESTORE_USER_R25 - ld r25, [r25, TASK_THREAD + THREAD_USER_R25] -.endm - /*------------------------------------------------------------- * given a tsk struct, get to the base of it's kernel mode stack * tsk->thread_info is really a PAGE, whose bottom hoists stack @@ -297,22 +295,21 @@ GET_CURR_TASK_ON_CPU r9 -#ifdef CONFIG_ARC_CURR_IN_REG - - /* If current task pointer cached in r25, time to - * -safekeep USER r25 in task->thread_struct->user_r25 - * -load r25 with current task ptr - */ - st.as r25, [r9, (TASK_THREAD + THREAD_USER_R25)/4] - mov r25, r9 -#endif - /* With current tsk in r9, get it's kernel mode stack base */ GET_TSK_STACK_BASE r9, r9 66: +#ifdef CONFIG_ARC_CURR_IN_REG + /* + * Treat r25 as scratch reg, save it on stack first + * Load it with current task pointer + */ + st r25, [r9, -4] + GET_CURR_TASK_ON_CPU r25 +#endif + /* Save Pre Intr/Exception User SP on kernel stack */ - st.a sp, [r9, -12] ; Make room for orig_r0 and orig_r8 + st.a sp, [r9, -16] ; Make room for orig_r0, orig_r8, user_r25 /* CAUTION: * SP should be set at the very end when we are done with everything @@ -466,7 +463,7 @@ RESTORE_R12_TO_R0 ld sp, [sp] /* restore original sp */ - /* orig_r0 and orig_r8 skipped automatically */ + /* orig_r0, orig_r8, user_r25 skipped automatically */ .endm @@ -549,7 +546,7 @@ RESTORE_R12_TO_R0 ld sp, [sp] /* restore original sp */ - /* orig_r0 and orig_r8 skipped automatically */ + /* orig_r0, orig_r8, user_r25 skipped automatically */ .endm .macro RESTORE_ALL_INT2 @@ -568,7 +565,7 @@ RESTORE_R12_TO_R0 ld sp, [sp] /* restore original sp */ - /* orig_r0 and orig_r8 skipped automatically */ + /* orig_r0, orig_r8, user_r25 skipped automatically */ .endm |