1 files changed, 325 insertions, 0 deletions

diff --git a/arch/m68k/math-emu/fp_entry.S b/arch/m68k/math-emu/fp_entry.S
new file mode 100644
index 000000000000..5ec2d9101ea3
--- /dev/null
+++ b/arch/m68k/math-emu/fp_entry.S
@@ -0,0 +1,325 @@
+/*
+ * fp_emu.S
+ *
+ * Copyright Roman Zippel, 1997.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU General Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/config.h>
+#include <linux/linkage.h>
+#include <asm/entry.h>
+
+#include "fp_emu.h"
+
+        .globl  fpu_emu
+        .globl  fp_debugprint
+        .globl  fp_err_ua1,fp_err_ua2
+
+        .text
+fpu_emu:
+        SAVE_ALL_INT
+        GET_CURRENT(%d0)
+
+#if defined(CPU_M68020_OR_M68030) && defined(CPU_M68040_OR_M68060)
+        tst.l   m68k_is040or060
+        jeq     1f
+#endif
+#if defined(CPU_M68040_OR_M68060)
+        move.l  (FPS_PC2,%sp),(FPS_PC,%sp)
+#endif
+1:
+        | emulate the instruction
+        jsr     fp_scan
+
+#if defined(CONFIG_M68060)
+#if !defined(CPU_M68060_ONLY)
+        btst    #3,m68k_cputype+3
+        jeq     1f
+#endif
+        btst    #7,(FPS_SR,%sp)
+        jne     fp_sendtrace060
+#endif
+1:
+        | emulation successful?
+        tst.l   %d0
+        jeq     ret_from_exception
+
+        | send some signal to program here
+
+        jra     ret_from_exception
+
+        | we jump here after an access error while trying to access
+        | user space, we correct stackpointer and send a SIGSEGV to
+        | the user process
+fp_err_ua2:
+        addq.l  #4,%sp
+fp_err_ua1:
+        addq.l  #4,%sp
+        move.l  %a0,-(%sp)
+        pea     SEGV_MAPERR
+        pea     SIGSEGV
+        jsr     fpemu_signal
+        add.w   #12,%sp
+        jra     ret_from_exception
+
+#if defined(CONFIG_M68060)
+        | send a trace signal if we are debugged
+        | it does not really belong here, but...
+fp_sendtrace060:
+        move.l  (FPS_PC,%sp),-(%sp)
+        pea     TRAP_TRACE
+        pea     SIGTRAP
+        jsr     fpemu_signal
+        add.w   #12,%sp
+        jra     ret_from_exception
+#endif
+
+        .globl  fp_get_data_reg, fp_put_data_reg
+        .globl  fp_get_addr_reg, fp_put_addr_reg
+
+        | Entry points to get/put a register. Some of them can be get/put
+        | directly, others are on the stack, as we read/write the stack
+        | directly here, these function may only be called from within
+        | instruction decoding, otherwise the stack pointer is incorrect
+        | and the stack gets corrupted.
+fp_get_data_reg:
+        jmp     ([0f:w,%pc,%d0.w*4])
+
+        .align  4
+0:
+        .long   fp_get_d0, fp_get_d1
+        .long   fp_get_d2, fp_get_d3
+        .long   fp_get_d4, fp_get_d5
+        .long   fp_get_d6, fp_get_d7
+
+fp_get_d0:
+        move.l  (PT_D0+8,%sp),%d0
+        printf  PREGISTER,"{d0->%08x}",1,%d0
+        rts
+
+fp_get_d1:
+        move.l  (PT_D1+8,%sp),%d0
+        printf  PREGISTER,"{d1->%08x}",1,%d0
+        rts
+
+fp_get_d2:
+        move.l  (PT_D2+8,%sp),%d0
+        printf  PREGISTER,"{d2->%08x}",1,%d0
+        rts
+
+fp_get_d3:
+        move.l  %d3,%d0
+        printf  PREGISTER,"{d3->%08x}",1,%d0
+        rts
+
+fp_get_d4:
+        move.l  %d4,%d0
+        printf  PREGISTER,"{d4->%08x}",1,%d0
+        rts
+
+fp_get_d5:
+        move.l  %d5,%d0
+        printf  PREGISTER,"{d5->%08x}",1,%d0
+        rts
+
+fp_get_d6:
+        move.l  %d6,%d0
+        printf  PREGISTER,"{d6->%08x}",1,%d0
+        rts
+
+fp_get_d7:
+        move.l  %d7,%d0
+        printf  PREGISTER,"{d7->%08x}",1,%d0
+        rts
+
+fp_put_data_reg:
+        jmp     ([0f:w,%pc,%d1.w*4])
+
+        .align  4
+0:
+        .long   fp_put_d0, fp_put_d1
+        .long   fp_put_d2, fp_put_d3
+        .long   fp_put_d4, fp_put_d5
+        .long   fp_put_d6, fp_put_d7
+
+fp_put_d0:
+        printf  PREGISTER,"{d0<-%08x}",1,%d0
+        move.l  %d0,(PT_D0+8,%sp)
+        rts
+
+fp_put_d1:
+        printf  PREGISTER,"{d1<-%08x}",1,%d0
+        move.l  %d0,(PT_D1+8,%sp)
+        rts
+
+fp_put_d2:
+        printf  PREGISTER,"{d2<-%08x}",1,%d0
+        move.l  %d0,(PT_D2+8,%sp)
+        rts
+
+fp_put_d3:
+        printf  PREGISTER,"{d3<-%08x}",1,%d0
+|       move.l  %d0,%d3
+        move.l  %d0,(PT_D3+8,%sp)
+        rts
+
+fp_put_d4:
+        printf  PREGISTER,"{d4<-%08x}",1,%d0
+|       move.l  %d0,%d4
+        move.l  %d0,(PT_D4+8,%sp)
+        rts
+
+fp_put_d5:
+        printf  PREGISTER,"{d5<-%08x}",1,%d0
+|       move.l  %d0,%d5
+        move.l  %d0,(PT_D5+8,%sp)
+        rts
+
+fp_put_d6:
+        printf  PREGISTER,"{d6<-%08x}",1,%d0
+        move.l  %d0,%d6
+        rts
+
+fp_put_d7:
+        printf  PREGISTER,"{d7<-%08x}",1,%d0
+        move.l  %d0,%d7
+        rts
+
+fp_get_addr_reg:
+        jmp     ([0f:w,%pc,%d0.w*4])
+
+        .align  4
+0:
+        .long   fp_get_a0, fp_get_a1
+        .long   fp_get_a2, fp_get_a3
+        .long   fp_get_a4, fp_get_a5
+        .long   fp_get_a6, fp_get_a7
+
+fp_get_a0:
+        move.l  (PT_A0+8,%sp),%a0
+        printf  PREGISTER,"{a0->%08x}",1,%a0
+        rts
+
+fp_get_a1:
+        move.l  (PT_A1+8,%sp),%a0
+        printf  PREGISTER,"{a1->%08x}",1,%a0
+        rts
+
+fp_get_a2:
+        move.l  (PT_A2+8,%sp),%a0
+        printf  PREGISTER,"{a2->%08x}",1,%a0
+        rts
+
+fp_get_a3:
+        move.l  %a3,%a0
+        printf  PREGISTER,"{a3->%08x}",1,%a0
+        rts
+
+fp_get_a4:
+        move.l  %a4,%a0
+        printf  PREGISTER,"{a4->%08x}",1,%a0
+        rts
+
+fp_get_a5:
+        move.l  %a5,%a0
+        printf  PREGISTER,"{a5->%08x}",1,%a0
+        rts
+
+fp_get_a6:
+        move.l  %a6,%a0
+        printf  PREGISTER,"{a6->%08x}",1,%a0
+        rts
+
+fp_get_a7:
+        move.l  %usp,%a0
+        printf  PREGISTER,"{a7->%08x}",1,%a0
+        rts
+
+fp_put_addr_reg:
+        jmp     ([0f:w,%pc,%d0.w*4])
+
+        .align  4
+0:
+        .long   fp_put_a0, fp_put_a1
+        .long   fp_put_a2, fp_put_a3
+        .long   fp_put_a4, fp_put_a5
+        .long   fp_put_a6, fp_put_a7
+
+fp_put_a0:
+        printf  PREGISTER,"{a0<-%08x}",1,%a0
+        move.l  %a0,(PT_A0+8,%sp)
+        rts
+
+fp_put_a1:
+        printf  PREGISTER,"{a1<-%08x}",1,%a0
+        move.l  %a0,(PT_A1+8,%sp)
+        rts
+
+fp_put_a2:
+        printf  PREGISTER,"{a2<-%08x}",1,%a0
+        move.l  %a0,(PT_A2+8,%sp)
+        rts
+
+fp_put_a3:
+        printf  PREGISTER,"{a3<-%08x}",1,%a0
+        move.l  %a0,%a3
+        rts
+
+fp_put_a4:
+        printf  PREGISTER,"{a4<-%08x}",1,%a0
+        move.l  %a0,%a4
+        rts
+
+fp_put_a5:
+        printf  PREGISTER,"{a5<-%08x}",1,%a0
+        move.l  %a0,%a5
+        rts
+
+fp_put_a6:
+        printf  PREGISTER,"{a6<-%08x}",1,%a0
+        move.l  %a0,%a6
+        rts
+
+fp_put_a7:
+        printf  PREGISTER,"{a7<-%08x}",1,%a0
+        move.l  %a0,%usp
+        rts
+
+        .data
+        .align  4
+
+fp_debugprint:
+|       .long   PMDECODE
+        .long   PMINSTR+PMDECODE+PMCONV+PMNORM
+|       .long   PMCONV+PMNORM+PMINSTR
+|       .long   0