diff options
| -rw-r--r-- | arch/arc/include/asm/entry.h | 43 | ||||
| -rw-r--r-- | arch/arc/include/asm/processor.h | 3 | ||||
| -rw-r--r-- | arch/arc/include/asm/ptrace.h | 2 | ||||
| -rw-r--r-- | arch/arc/kernel/asm-offsets.c | 4 | ||||
| -rw-r--r-- | arch/arc/kernel/entry.S | 11 | ||||
| -rw-r--r-- | arch/arc/kernel/process.c | 1 |
6 files changed, 24 insertions, 40 deletions
diff --git a/arch/arc/include/asm/entry.h b/arch/arc/include/asm/entry.h index 2cf6aa08cfca..72a7ed47117a 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 diff --git a/arch/arc/include/asm/processor.h b/arch/arc/include/asm/processor.h index 8c77e623c4e5..b0b5d2d9b3d3 100644 --- a/arch/arc/include/asm/processor.h +++ b/arch/arc/include/asm/processor.h @@ -30,9 +30,6 @@ struct thread_struct { unsigned long callee_reg; /* pointer to callee regs */ unsigned long fault_address; /* dbls as brkpt holder as well */ unsigned long cause_code; /* Exception Cause Code (ECR) */ -#ifdef CONFIG_ARC_CURR_IN_REG - unsigned long user_r25; -#endif #ifdef CONFIG_ARC_FPU_SAVE_RESTORE struct arc_fpu fpu; #endif diff --git a/arch/arc/include/asm/ptrace.h b/arch/arc/include/asm/ptrace.h index 47801ba135b3..7b2de6f7025a 100644 --- a/arch/arc/include/asm/ptrace.h +++ b/arch/arc/include/asm/ptrace.h @@ -54,6 +54,8 @@ struct pt_regs { #endif long orig_r8_word; }; + + long user_r25; }; /* Callee saved registers - need to be saved only when you are scheduled out */ diff --git a/arch/arc/kernel/asm-offsets.c b/arch/arc/kernel/asm-offsets.c index fdcd76532b70..75f05b83d77d 100644 --- a/arch/arc/kernel/asm-offsets.c +++ b/arch/arc/kernel/asm-offsets.c @@ -24,9 +24,6 @@ int main(void) DEFINE(THREAD_KSP, offsetof(struct thread_struct, ksp)); DEFINE(THREAD_CALLEE_REG, offsetof(struct thread_struct, callee_reg)); -#ifdef CONFIG_ARC_CURR_IN_REG - DEFINE(THREAD_USER_R25, offsetof(struct thread_struct, user_r25)); -#endif DEFINE(THREAD_FAULT_ADDR, offsetof(struct thread_struct, fault_address)); @@ -61,5 +58,6 @@ int main(void) DEFINE(PT_r7, offsetof(struct pt_regs, r7)); DEFINE(SZ_CALLEE_REGS, sizeof(struct callee_regs)); + DEFINE(SZ_PT_REGS, sizeof(struct pt_regs)); return 0; } diff --git a/arch/arc/kernel/entry.S b/arch/arc/kernel/entry.S index 919e2f065d2f..fd5f9160bbd2 100644 --- a/arch/arc/kernel/entry.S +++ b/arch/arc/kernel/entry.S @@ -680,17 +680,6 @@ restore_regs : ; XXX can this be optimised out IRQ_DISABLE_SAVE r9, r10 ;@r10 has prisitine (pre-disable) copy -#ifdef CONFIG_ARC_CURR_IN_REG - ; Restore User R25 - ; Earlier this used to be only for returning to user mode - ; However with 2 levels of IRQ this can also happen even if - ; in kernel mode - ld r9, [sp, PT_sp] - brhs r9, VMALLOC_START, 8f - RESTORE_USER_R25 -8: -#endif - ; Restore REG File. In case multiple Events outstanding, ; use the same priorty as rtie: EXCPN, L2 IRQ, L1 IRQ, None ; Note that we use realtime STATUS32 (not pt_regs->status32) to diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c index c6e22e060578..a3cc6a577039 100644 --- a/arch/arc/kernel/process.c +++ b/arch/arc/kernel/process.c @@ -77,6 +77,7 @@ asmlinkage void ret_from_fork(void); * | SP | * | orig_r0 | * | orig_r8 | + * | user_r25 | * ------------------ <===== END of PAGE */ int copy_thread(unsigned long clone_flags, |