diff options
Diffstat (limited to 'arch/arc/include/asm/entry.h')
| -rw-r--r-- | arch/arc/include/asm/entry.h | 224 |
1 files changed, 47 insertions, 177 deletions
diff --git a/arch/arc/include/asm/entry.h b/arch/arc/include/asm/entry.h index fcdd59d77f42..38c35722cebf 100644 --- a/arch/arc/include/asm/entry.h +++ b/arch/arc/include/asm/entry.h @@ -7,193 +7,45 @@ #ifndef __ASM_ARC_ENTRY_H #define __ASM_ARC_ENTRY_H -#include <asm/unistd.h> /* For NR_syscalls defination */ +#include <asm/unistd.h> /* For NR_syscalls definition */ #include <asm/arcregs.h> #include <asm/ptrace.h> #include <asm/processor.h> /* For VMALLOC_START */ #include <asm/mmu.h> +#ifdef __ASSEMBLY__ + #ifdef CONFIG_ISA_ARCOMPACT #include <asm/entry-compact.h> /* ISA specific bits */ #else #include <asm/entry-arcv2.h> #endif -/* Note on the LD/ST addr modes with addr reg wback - * - * LD.a same as LD.aw - * - * LD.a reg1, [reg2, x] => Pre Incr - * Eff Addr for load = [reg2 + x] - * - * LD.ab reg1, [reg2, x] => Post Incr - * Eff Addr for load = [reg2] +/* + * save user mode callee regs as struct callee_regs + * - needed by fork/do_signal/unaligned-access-emulation. */ - -.macro PUSH reg - st.a \reg, [sp, -4] -.endm - -.macro PUSHAX aux - lr r9, [\aux] - PUSH r9 -.endm - -.macro POP reg - ld.ab \reg, [sp, 4] -.endm - -.macro POPAX aux - POP r9 - sr r9, [\aux] -.endm - -/*-------------------------------------------------------------- - * Helpers to save/restore Scratch Regs: - * used by Interrupt/Exception Prologue/Epilogue - *-------------------------------------------------------------*/ -.macro SAVE_R0_TO_R12 - PUSH r0 - PUSH r1 - PUSH r2 - PUSH r3 - PUSH r4 - PUSH r5 - PUSH r6 - PUSH r7 - PUSH r8 - PUSH r9 - PUSH r10 - PUSH r11 - PUSH r12 -.endm - -.macro RESTORE_R12_TO_R0 - POP r12 - POP r11 - POP r10 - POP r9 - POP r8 - POP r7 - POP r6 - POP r5 - POP r4 - POP r3 - POP r2 - POP r1 - POP r0 - -.endm - -/*-------------------------------------------------------------- - * Helpers to save/restore callee-saved regs: - * used by several macros below - *-------------------------------------------------------------*/ -.macro SAVE_R13_TO_R24 - PUSH r13 - PUSH r14 - PUSH r15 - PUSH r16 - PUSH r17 - PUSH r18 - PUSH r19 - PUSH r20 - PUSH r21 - PUSH r22 - PUSH r23 - PUSH r24 -.endm - -.macro RESTORE_R24_TO_R13 - POP r24 - POP r23 - POP r22 - POP r21 - POP r20 - POP r19 - POP r18 - POP r17 - POP r16 - POP r15 - POP r14 - POP r13 -.endm - -/*-------------------------------------------------------------- - * Collect User Mode callee regs as struct callee_regs - needed by - * fork/do_signal/unaligned-access-emulation. - * (By default only scratch regs are saved on entry to kernel) - * - * Special handling for r25 if used for caching Task Pointer. - * It would have been saved in task->thread.user_r25 already, but to keep - * the interface same it is copied into regular r25 placeholder in - * struct callee_regs. - *-------------------------------------------------------------*/ .macro SAVE_CALLEE_SAVED_USER + SAVE_ABI_CALLEE_REGS +.endm - mov r12, sp ; save SP as ref to pt_regs - SAVE_R13_TO_R24 - -#ifdef CONFIG_ARC_CURR_IN_REG - ; Retrieve orig r25 and save it with rest of callee_regs - ld r12, [r12, PT_user_r25] - PUSH r12 -#else - PUSH r25 -#endif - +/* + * restore user mode callee regs as struct callee_regs + * - could have been changed by ptrace tracer or unaligned-access fixup + */ +.macro RESTORE_CALLEE_SAVED_USER + RESTORE_ABI_CALLEE_REGS .endm -/*-------------------------------------------------------------- - * Save kernel Mode callee regs at the time of Contect Switch. - * - * Special handling for r25 if used for caching Task Pointer. - * Kernel simply skips saving it since it will be loaded with - * incoming task pointer anyways - *-------------------------------------------------------------*/ +/* + * save/restore kernel mode callee regs at the time of context switch + */ .macro SAVE_CALLEE_SAVED_KERNEL - - SAVE_R13_TO_R24 - -#ifdef CONFIG_ARC_CURR_IN_REG - sub sp, sp, 4 -#else - PUSH r25 -#endif + SAVE_ABI_CALLEE_REGS .endm -/*-------------------------------------------------------------- - * Opposite of SAVE_CALLEE_SAVED_KERNEL - *-------------------------------------------------------------*/ .macro RESTORE_CALLEE_SAVED_KERNEL - -#ifdef CONFIG_ARC_CURR_IN_REG - add sp, sp, 4 /* skip usual r25 placeholder */ -#else - POP r25 -#endif - RESTORE_R24_TO_R13 -.endm - -/*-------------------------------------------------------------- - * Opposite of SAVE_CALLEE_SAVED_USER - * - * ptrace tracer or unaligned-access fixup might have changed a user mode - * callee reg which is saved back to usual r25 storage location - *-------------------------------------------------------------*/ -.macro RESTORE_CALLEE_SAVED_USER - -#ifdef CONFIG_ARC_CURR_IN_REG - POP r12 -#else - POP r25 -#endif - RESTORE_R24_TO_R13 - - ; SP is back to start of pt_regs -#ifdef CONFIG_ARC_CURR_IN_REG - st r12, [sp, PT_user_r25] -#endif + RESTORE_ABI_CALLEE_REGS .endm /*-------------------------------------------------------------- @@ -204,7 +56,7 @@ .endm /*------------------------------------------------------------- - * given a tsk struct, get to the base of it's kernel mode stack + * given a tsk struct, get to the base of its kernel mode stack * tsk->thread_info is really a PAGE, whose bottom hoists stack * which grows upwards towards thread_info *------------------------------------------------------------*/ @@ -229,10 +81,10 @@ #ifdef CONFIG_SMP -/*------------------------------------------------- +/* * Retrieve the current running task on this CPU - * 1. Determine curr CPU id. - * 2. Use it to index into _current_task[ ] + * - loads it from backing _current_task[] (and can't use the + * caching reg for current task */ .macro GET_CURR_TASK_ON_CPU reg GET_CPU_ID \reg @@ -254,7 +106,7 @@ add2 \tmp, @_current_task, \tmp st \tsk, [\tmp] #ifdef CONFIG_ARC_CURR_IN_REG - mov r25, \tsk + mov gp, \tsk #endif .endm @@ -269,21 +121,20 @@ .macro SET_CURR_TASK_ON_CPU tsk, tmp st \tsk, [@_current_task] #ifdef CONFIG_ARC_CURR_IN_REG - mov r25, \tsk + mov gp, \tsk #endif .endm #endif /* SMP / UNI */ -/* ------------------------------------------------------------------ +/* * Get the ptr to some field of Current Task at @off in task struct - * -Uses r25 for Current task ptr if that is enabled + * - Uses current task cached in reg if enabled */ - #ifdef CONFIG_ARC_CURR_IN_REG .macro GET_CURR_TASK_FIELD_PTR off, reg - add \reg, r25, \off + add \reg, gp, \off .endm #else @@ -295,4 +146,23 @@ #endif /* CONFIG_ARC_CURR_IN_REG */ +#else /* !__ASSEMBLY__ */ + +extern void do_signal(struct pt_regs *); +extern void do_notify_resume(struct pt_regs *); +extern int do_privilege_fault(unsigned long, struct pt_regs *); +extern int do_extension_fault(unsigned long, struct pt_regs *); +extern int insterror_is_error(unsigned long, struct pt_regs *); +extern int do_memory_error(unsigned long, struct pt_regs *); +extern int trap_is_brkpt(unsigned long, struct pt_regs *); +extern int do_misaligned_error(unsigned long, struct pt_regs *); +extern int do_trap5_error(unsigned long, struct pt_regs *); +extern int do_misaligned_access(unsigned long, struct pt_regs *, struct callee_regs *); +extern void do_machine_check_fault(unsigned long, struct pt_regs *); +extern void do_non_swi_trap(unsigned long, struct pt_regs *); +extern void do_insterror_or_kprobe(unsigned long, struct pt_regs *); +extern void do_page_fault(unsigned long, struct pt_regs *); + +#endif + #endif /* __ASM_ARC_ENTRY_H */ |