From f86b9e03837beafb4b48d53a76ee4b88559226de Mon Sep 17 00:00:00 2001 From: Greg Ungerer Date: Tue, 19 Aug 2014 11:39:09 +1000 Subject: m68k: move coldfire platform code Move the m68k ColdFire platform support code directory to be with the existing m68k platforms. Although the ColdFire is not a platform as such, we have always kept all its support together. No reason to change that as this time. Signed-off-by: Greg Ungerer Acked-by: Geert Uytterhoeven --- arch/m68k/coldfire/entry.S | 203 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 203 insertions(+) create mode 100644 arch/m68k/coldfire/entry.S (limited to 'arch/m68k/coldfire/entry.S') diff --git a/arch/m68k/coldfire/entry.S b/arch/m68k/coldfire/entry.S new file mode 100644 index 000000000000..881ab8e379d4 --- /dev/null +++ b/arch/m68k/coldfire/entry.S @@ -0,0 +1,203 @@ +/* + * linux/arch/m68knommu/platform/5307/entry.S + * + * Copyright (C) 1999-2007, Greg Ungerer (gerg@snapgear.com) + * Copyright (C) 1998 D. Jeff Dionne , + * Kenneth Albanowski , + * Copyright (C) 2000 Lineo Inc. (www.lineo.com) + * Copyright (C) 2004-2006 Macq Electronique SA. (www.macqel.com) + * + * Based on: + * + * linux/arch/m68k/kernel/entry.S + * + * Copyright (C) 1991, 1992 Linus Torvalds + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file README.legal in the main directory of this archive + * for more details. + * + * Linux/m68k support by Hamish Macdonald + * + * 68060 fixes by Jesper Skov + * ColdFire support by Greg Ungerer (gerg@snapgear.com) + * 5307 fixes by David W. Miller + * linux 2.4 support David McCullough + * Bug, speed and maintainability fixes by Philippe De Muyter + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef CONFIG_COLDFIRE_SW_A7 +/* + * Define software copies of the supervisor and user stack pointers. + */ +.bss +sw_ksp: +.long 0 +sw_usp: +.long 0 +#endif /* CONFIG_COLDFIRE_SW_A7 */ + +.text + +.globl system_call +.globl resume +.globl ret_from_exception +.globl ret_from_signal +.globl sys_call_table +.globl inthandler + +enosys: + mov.l #sys_ni_syscall,%d3 + bra 1f + +ENTRY(system_call) + SAVE_ALL_SYS + move #0x2000,%sr /* enable intrs again */ + GET_CURRENT(%d2) + + cmpl #NR_syscalls,%d0 + jcc enosys + lea sys_call_table,%a0 + lsll #2,%d0 /* movel %a0@(%d0:l:4),%d3 */ + movel %a0@(%d0),%d3 + jeq enosys + +1: + movel %sp,%d2 /* get thread_info pointer */ + andl #-THREAD_SIZE,%d2 /* at start of kernel stack */ + movel %d2,%a0 + movel %a0@,%a1 /* save top of frame */ + movel %sp,%a1@(TASK_THREAD+THREAD_ESP0) + btst #(TIF_SYSCALL_TRACE%8),%a0@(TINFO_FLAGS+(31-TIF_SYSCALL_TRACE)/8) + bnes 1f + + movel %d3,%a0 + jbsr %a0@ + movel %d0,%sp@(PT_OFF_D0) /* save the return value */ + jra ret_from_exception +1: + movel #-ENOSYS,%d2 /* strace needs -ENOSYS in PT_OFF_D0 */ + movel %d2,PT_OFF_D0(%sp) /* on syscall entry */ + subql #4,%sp + SAVE_SWITCH_STACK + jbsr syscall_trace_enter + RESTORE_SWITCH_STACK + addql #4,%sp + movel %d3,%a0 + jbsr %a0@ + movel %d0,%sp@(PT_OFF_D0) /* save the return value */ + subql #4,%sp /* dummy return address */ + SAVE_SWITCH_STACK + jbsr syscall_trace_leave + +ret_from_signal: + RESTORE_SWITCH_STACK + addql #4,%sp + +ret_from_exception: + move #0x2700,%sr /* disable intrs */ + btst #5,%sp@(PT_OFF_SR) /* check if returning to kernel */ + jeq Luser_return /* if so, skip resched, signals */ + +#ifdef CONFIG_PREEMPT + movel %sp,%d1 /* get thread_info pointer */ + andl #-THREAD_SIZE,%d1 /* at base of kernel stack */ + movel %d1,%a0 + movel %a0@(TINFO_FLAGS),%d1 /* get thread_info->flags */ + andl #(1<flags (low 8 bits) */ + jne Lwork_to_do /* still work to do */ + +Lreturn: + RESTORE_USER + +Lwork_to_do: + movel %a0@(TINFO_FLAGS),%d1 /* get thread_info->flags */ + move #0x2000,%sr /* enable intrs again */ + btst #TIF_NEED_RESCHED,%d1 + jne reschedule + +Lsignal_return: + subql #4,%sp /* dummy return address */ + SAVE_SWITCH_STACK + pea %sp@(SWITCH_STACK_SIZE) + jsr do_notify_resume + addql #4,%sp + RESTORE_SWITCH_STACK + addql #4,%sp + jmp Luser_return + +/* + * This is the generic interrupt handler (for all hardware interrupt + * sources). Calls up to high level code to do all the work. + */ +ENTRY(inthandler) + SAVE_ALL_INT + GET_CURRENT(%d2) + + movew %sp@(PT_OFF_FORMATVEC),%d0 /* put exception # in d0 */ + andl #0x03fc,%d0 /* mask out vector only */ + + movel %sp,%sp@- /* push regs arg */ + lsrl #2,%d0 /* calculate real vector # */ + movel %d0,%sp@- /* push vector number */ + jbsr do_IRQ /* call high level irq handler */ + lea %sp@(8),%sp /* pop args off stack */ + + bra ret_from_exception + +/* + * Beware - when entering resume, prev (the current task) is + * in a0, next (the new task) is in a1, so don't change these + * registers until their contents are no longer needed. + */ +ENTRY(resume) + movew %sr,%d1 /* save current status */ + movew %d1,%a0@(TASK_THREAD+THREAD_SR) + movel %a0,%d1 /* get prev thread in d1 */ + SAVE_SWITCH_STACK + movel %sp,%a0@(TASK_THREAD+THREAD_KSP) /* save kernel stack pointer */ + RDUSP /* movel %usp,%a3 */ + movel %a3,%a0@(TASK_THREAD+THREAD_USP) /* save thread user stack */ +#ifdef CONFIG_MMU + movel %a1,%a2 /* set new current */ +#endif + movel %a1@(TASK_THREAD+THREAD_USP),%a3 /* restore thread user stack */ + WRUSP /* movel %a3,%usp */ + movel %a1@(TASK_THREAD+THREAD_KSP),%sp /* restore new kernel stack */ + movew %a1@(TASK_THREAD+THREAD_SR),%d7 /* restore new status */ + movew %d7,%sr + RESTORE_SWITCH_STACK + rts + -- cgit