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linux/arch/m68k/kernel/entry_no.S

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Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
/*
* linux/arch/m68knommu/kernel/entry.S
*
* Copyright (C) 1999-2002, Greg Ungerer (gerg@snapgear.com)
* Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
* Kenneth Albanowski <kjahds@kjahds.com>,
* Copyright (C) 2000 Lineo Inc. (www.lineo.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 <davidm@snapgear.com>
*/
#include <linux/linkage.h>
#include <asm/errno.h>
#include <asm/setup.h>
#include <asm/segment.h>
#include <asm/asm-offsets.h>
#include <asm/entry.h>
m68knommu: fix signal handling return path The return from software signal handling pushes code on the stack that system calls to the kernels cleanup code. This is borrowed directly from the m68k linux signal handler. The rt signal case is not quite right for the restricted instruction set of the ColdFire parts. And neither the normal signal case or rt signal case properly flushes/pushes the appropriate cache lines. Rework the return path to just call back through some code fragments in the kernel proper (with no MMU in the way we can do this). No cache problems, and less code overall. Original patch submitted by Wilson Callan <wcallan@savantav.com> Greg fixed the rt signal return path to use the proper system call Signed-off-by: Greg Ungerer <gerg@uclinux.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-01 06:16:28 +04:00
#include <asm/unistd.h>
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
.text
.globl buserr
.globl trap
.globl ret_from_exception
.globl ret_from_signal
.globl sys_fork
.globl sys_clone
.globl sys_vfork
ENTRY(buserr)
m68k: merge mmu and non-mmu include/asm/entry.h files The changes in the mmu version of entry.h (entry_mm.h) and the non-mmu version (entry_no.h) are not about the presence or use of an MMU at all. The main changes are to support the ColdFire processors. The code for trap entry and exit for all types of 68k processor outside coldfire is the same. So merge the files back to a single entry.h and share the common 68k entry/exit code. Some changes are required for the non-mmu entry handlers to adopt the differing macros for system call and interrupt entry, but this is quite strait forward. The changes for the ColdFire remove a couple of instructions for the separate a7 register case, and are no worse for the older single a7 register case. Signed-off-by: Greg Ungerer <gerg@uclinux.org>
2011-06-22 07:50:44 +04:00
SAVE_ALL_INT
m68k: set register a2 to current if MMU enabled on ColdFire Virtual memory m68k systems build with register a2 dedicated to being the current proc pointer (non-MMU don't do this). Add code to the ColdFire interrupt and exception processing to set this on entry, and at context switch time. We use the same GET_CURRENT() macro that MMU enabled code uses - modifying it so that the assembler is ColdFire clean. Signed-off-by: Greg Ungerer <gerg@uclinux.org> Acked-by: Matt Waddel <mwaddel@yahoo.com> Acked-by: Kurt Mahan <kmahan@xmission.com> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
2011-10-14 09:41:56 +04:00
GET_CURRENT(%d0)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
movel %sp,%sp@- /* stack frame pointer argument */
jsr buserr_c
addql #4,%sp
jra ret_from_exception
ENTRY(trap)
m68k: merge mmu and non-mmu include/asm/entry.h files The changes in the mmu version of entry.h (entry_mm.h) and the non-mmu version (entry_no.h) are not about the presence or use of an MMU at all. The main changes are to support the ColdFire processors. The code for trap entry and exit for all types of 68k processor outside coldfire is the same. So merge the files back to a single entry.h and share the common 68k entry/exit code. Some changes are required for the non-mmu entry handlers to adopt the differing macros for system call and interrupt entry, but this is quite strait forward. The changes for the ColdFire remove a couple of instructions for the separate a7 register case, and are no worse for the older single a7 register case. Signed-off-by: Greg Ungerer <gerg@uclinux.org>
2011-06-22 07:50:44 +04:00
SAVE_ALL_INT
m68k: set register a2 to current if MMU enabled on ColdFire Virtual memory m68k systems build with register a2 dedicated to being the current proc pointer (non-MMU don't do this). Add code to the ColdFire interrupt and exception processing to set this on entry, and at context switch time. We use the same GET_CURRENT() macro that MMU enabled code uses - modifying it so that the assembler is ColdFire clean. Signed-off-by: Greg Ungerer <gerg@uclinux.org> Acked-by: Matt Waddel <mwaddel@yahoo.com> Acked-by: Kurt Mahan <kmahan@xmission.com> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
2011-10-14 09:41:56 +04:00
GET_CURRENT(%d0)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
movel %sp,%sp@- /* stack frame pointer argument */
jsr trap_c
addql #4,%sp
jra ret_from_exception
#ifdef TRAP_DBG_INTERRUPT
.globl dbginterrupt
ENTRY(dbginterrupt)
m68k: merge mmu and non-mmu include/asm/entry.h files The changes in the mmu version of entry.h (entry_mm.h) and the non-mmu version (entry_no.h) are not about the presence or use of an MMU at all. The main changes are to support the ColdFire processors. The code for trap entry and exit for all types of 68k processor outside coldfire is the same. So merge the files back to a single entry.h and share the common 68k entry/exit code. Some changes are required for the non-mmu entry handlers to adopt the differing macros for system call and interrupt entry, but this is quite strait forward. The changes for the ColdFire remove a couple of instructions for the separate a7 register case, and are no worse for the older single a7 register case. Signed-off-by: Greg Ungerer <gerg@uclinux.org>
2011-06-22 07:50:44 +04:00
SAVE_ALL_INT
m68k: set register a2 to current if MMU enabled on ColdFire Virtual memory m68k systems build with register a2 dedicated to being the current proc pointer (non-MMU don't do this). Add code to the ColdFire interrupt and exception processing to set this on entry, and at context switch time. We use the same GET_CURRENT() macro that MMU enabled code uses - modifying it so that the assembler is ColdFire clean. Signed-off-by: Greg Ungerer <gerg@uclinux.org> Acked-by: Matt Waddel <mwaddel@yahoo.com> Acked-by: Kurt Mahan <kmahan@xmission.com> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
2011-10-14 09:41:56 +04:00
GET_CURRENT(%d0)
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
2005-04-17 02:20:36 +04:00
movel %sp,%sp@- /* stack frame pointer argument */
jsr dbginterrupt_c
addql #4,%sp
jra ret_from_exception
#endif
ENTRY(reschedule)
/* save top of frame */
pea %sp@
jbsr set_esp0
addql #4,%sp
pea ret_from_exception
jmp schedule
ENTRY(ret_from_fork)
movel %d1,%sp@-
jsr schedule_tail
addql #4,%sp
jra ret_from_exception
ENTRY(sys_fork)
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
jbsr m68k_fork
addql #4,%sp
RESTORE_SWITCH_STACK
rts
ENTRY(sys_vfork)
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
jbsr m68k_vfork
addql #4,%sp
RESTORE_SWITCH_STACK
rts
ENTRY(sys_clone)
SAVE_SWITCH_STACK
pea %sp@(SWITCH_STACK_SIZE)
jbsr m68k_clone
addql #4,%sp
RESTORE_SWITCH_STACK
rts
ENTRY(sys_sigreturn)
SAVE_SWITCH_STACK
jbsr do_sigreturn
RESTORE_SWITCH_STACK
rts
ENTRY(sys_rt_sigreturn)
SAVE_SWITCH_STACK
jbsr do_rt_sigreturn
RESTORE_SWITCH_STACK
rts
m68knommu: fix signal handling return path The return from software signal handling pushes code on the stack that system calls to the kernels cleanup code. This is borrowed directly from the m68k linux signal handler. The rt signal case is not quite right for the restricted instruction set of the ColdFire parts. And neither the normal signal case or rt signal case properly flushes/pushes the appropriate cache lines. Rework the return path to just call back through some code fragments in the kernel proper (with no MMU in the way we can do this). No cache problems, and less code overall. Original patch submitted by Wilson Callan <wcallan@savantav.com> Greg fixed the rt signal return path to use the proper system call Signed-off-by: Greg Ungerer <gerg@uclinux.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-01 06:16:28 +04:00
ENTRY(ret_from_user_signal)
moveq #__NR_sigreturn,%d0
trap #0
ENTRY(ret_from_user_rt_signal)
Fix m68k-uclinux's rt_sigreturn trampoline Signed-off-by: Maxim Kuvyrkov <maxim@codesourcery.com> Signed-off-by: Greg Ungerer <gerg@uclinux.org>
2009-09-23 01:25:44 +04:00
movel #__NR_rt_sigreturn,%d0
m68knommu: fix signal handling return path The return from software signal handling pushes code on the stack that system calls to the kernels cleanup code. This is borrowed directly from the m68k linux signal handler. The rt signal case is not quite right for the restricted instruction set of the ColdFire parts. And neither the normal signal case or rt signal case properly flushes/pushes the appropriate cache lines. Rework the return path to just call back through some code fragments in the kernel proper (with no MMU in the way we can do this). No cache problems, and less code overall. Original patch submitted by Wilson Callan <wcallan@savantav.com> Greg fixed the rt signal return path to use the proper system call Signed-off-by: Greg Ungerer <gerg@uclinux.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-05-01 06:16:28 +04:00
trap #0
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