diff options
Diffstat (limited to 'arch/arc/include/asm/entry.h')
| -rw-r--r-- | arch/arc/include/asm/entry.h | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/arc/include/asm/entry.h b/arch/arc/include/asm/entry.h index 9eada5b28be..716f4f7b5cd 100644 --- a/arch/arc/include/asm/entry.h +++ b/arch/arc/include/asm/entry.h @@ -13,6 +13,8 @@ * was being "CLEARED" rather then "SET". Actually "SET" clears ZOL context * * Vineetg: May 5th 2008 + * -Modified CALLEE_REG save/restore macros to handle the fact that + * r25 contains the kernel current task ptr * - Defined Stack Switching Macro to be reused in all intr/excp hdlrs * - Shaved off 11 instructions from RESTORE_ALL_INT1 by using the * address Write back load ld.ab instead of seperate ld/add instn @@ -28,6 +30,7 @@ #include <asm/asm-offsets.h> #include <asm/arcregs.h> #include <asm/ptrace.h> +#include <asm/processor.h> /* For VMALLOC_START */ #include <asm/thread_info.h> /* For THREAD_SIZE */ /* Note on the LD/ST addr modes with addr reg wback @@ -106,7 +109,14 @@ st.a r22, [sp, -4] st.a r23, [sp, -4] st.a r24, [sp, -4] + +#ifdef CONFIG_ARC_CURR_IN_REG + ; Retrieve orig r25 and save it on stack + ld r12, [r25, TASK_THREAD + THREAD_USER_R25] + st.a r12, [sp, -4] +#else st.a r25, [sp, -4] +#endif /* move up by 1 word to "create" callee_regs->"stack_place_holder" */ sub sp, sp, 4 @@ -131,8 +141,12 @@ st.a r22, [sp, -4] st.a r23, [sp, -4] st.a r24, [sp, -4] +#ifdef CONFIG_ARC_CURR_IN_REG + sub sp, sp, 8 +#else st.a r25, [sp, -4] sub sp, sp, 4 +#endif .endm /*-------------------------------------------------------------- @@ -148,8 +162,14 @@ *-------------------------------------------------------------*/ .macro RESTORE_CALLEE_SAVED_KERNEL + +#ifdef CONFIG_ARC_CURR_IN_REG + add sp, sp, 8 /* skip callee_reg gutter and user r25 placeholder */ +#else add sp, sp, 4 /* skip "callee_regs->stack_place_holder" */ ld.ab r25, [sp, 4] +#endif + ld.ab r24, [sp, 4] ld.ab r23, [sp, 4] ld.ab r22, [sp, 4] @@ -235,6 +255,7 @@ * * Entry : r9 contains pre-IRQ/exception/trap status32 * Exit : SP is set to kernel mode stack pointer + * If CURR_IN_REG, r25 set to "current" task pointer * Clobbers: r9 *-------------------------------------------------------------*/ @@ -259,6 +280,16 @@ 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 @@ -519,17 +550,31 @@ .macro SET_CURR_TASK_ON_CPU tsk, tmp st \tsk, [@_current_task] +#ifdef CONFIG_ARC_CURR_IN_REG + mov r25, \tsk +#endif .endm /* ------------------------------------------------------------------ * Get the ptr to some field of Current Task at @off in task struct + * -Uses r25 for Current task ptr if that is enabled */ +#ifdef CONFIG_ARC_CURR_IN_REG + +.macro GET_CURR_TASK_FIELD_PTR off, reg + add \reg, r25, \off +.endm + +#else + .macro GET_CURR_TASK_FIELD_PTR off, reg GET_CURR_TASK_ON_CPU \reg add \reg, \reg, \off .endm +#endif /* CONFIG_ARC_CURR_IN_REG */ + #endif /* __ASSEMBLY__ */ #endif /* __ASM_ARC_ENTRY_H */ |