| /* |
| * fp_cond.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 "fp_emu.h" |
| #include "fp_decode.h" |
| |
| .globl fp_fscc, fp_fbccw, fp_fbccl |
| |
| #ifdef FPU_EMU_DEBUG |
| fp_fnop: |
| printf PDECODE,"fnop\n" |
| jra fp_end |
| #else |
| #define fp_fnop fp_end |
| #endif |
| |
| fp_fbccw: |
| tst.w %d2 |
| jeq fp_fnop |
| printf PDECODE,"fbccw " |
| fp_get_pc %a0 |
| lea (-2,%a0,%d2.w),%a0 |
| jra 1f |
| |
| fp_fbccl: |
| printf PDECODE,"fbccl " |
| fp_get_pc %a0 |
| move.l %d2,%d0 |
| swap %d0 |
| fp_get_instr_word %d0,fp_err_ua1 |
| lea (-2,%a0,%d0.l),%a0 |
| 1: printf PDECODE,"%x",1,%a0 |
| move.l %d2,%d0 |
| swap %d0 |
| jsr fp_compute_cond |
| tst.l %d0 |
| jeq 1f |
| fp_put_pc %a0,1 |
| 1: printf PDECODE,"\n" |
| jra fp_end |
| |
| fp_fdbcc: |
| printf PDECODE,"fdbcc " |
| fp_get_pc %a1 | calculate new pc |
| fp_get_instr_word %d0,fp_err_ua1 |
| add.w %d0,%a1 |
| fp_decode_addr_reg |
| printf PDECODE,"d%d,%x\n",2,%d0,%a1 |
| swap %d1 | test condition in %d1 |
| tst.w %d1 |
| jne 2f |
| move.l %d0,%d1 |
| jsr fp_get_data_reg |
| subq.w #1,%d0 |
| jcs 1f |
| fp_put_pc %a1,1 |
| 1: jsr fp_put_data_reg |
| 2: jra fp_end |
| |
| | set flags for decode macros for fs<cc> |
| do_fscc=1 |
| do_no_pc_mode=1 |
| |
| fp_fscc: |
| printf PDECODE,"fscc " |
| move.l %d2,%d0 |
| jsr fp_compute_cond |
| move.w %d0,%d1 |
| swap %d1 |
| |
| | decode addressing mode |
| fp_decode_addr_mode |
| |
| .long fp_data, fp_fdbcc |
| .long fp_indirect, fp_postinc |
| .long fp_predecr, fp_disp16 |
| .long fp_extmode0, fp_extmode1 |
| |
| | addressing mode: data register direct |
| fp_data: |
| fp_mode_data_direct |
| move.w %d0,%d1 | save register nr |
| jsr fp_get_data_reg |
| swap %d1 |
| move.b %d1,%d0 |
| swap %d1 |
| jsr fp_put_data_reg |
| printf PDECODE,"\n" |
| jra fp_end |
| |
| fp_indirect: |
| fp_mode_addr_indirect |
| jra fp_do_scc |
| |
| fp_postinc: |
| fp_mode_addr_indirect_postinc |
| jra fp_do_scc |
| |
| fp_predecr: |
| fp_mode_addr_indirect_predec |
| jra fp_do_scc |
| |
| fp_disp16: |
| fp_mode_addr_indirect_disp16 |
| jra fp_do_scc |
| |
| fp_extmode0: |
| fp_mode_addr_indirect_extmode0 |
| jra fp_do_scc |
| |
| fp_extmode1: |
| bfextu %d2{#13,#3},%d0 |
| jmp ([0f:w,%pc,%d0*4]) |
| |
| .align 4 |
| 0: |
| .long fp_absolute_short, fp_absolute_long |
| .long fp_ill, fp_ill | NOTE: jump here to ftrap.x |
| .long fp_ill, fp_ill |
| .long fp_ill, fp_ill |
| |
| fp_absolute_short: |
| fp_mode_abs_short |
| jra fp_do_scc |
| |
| fp_absolute_long: |
| fp_mode_abs_long |
| | jra fp_do_scc |
| |
| fp_do_scc: |
| swap %d1 |
| putuser.b %d1,(%a0),fp_err_ua1,%a0 |
| printf PDECODE,"\n" |
| jra fp_end |
| |
| |
| #define tst_NAN btst #24,%d1 |
| #define tst_Z btst #26,%d1 |
| #define tst_N btst #27,%d1 |
| |
| fp_compute_cond: |
| move.l (FPD_FPSR,FPDATA),%d1 |
| btst #4,%d0 |
| jeq 1f |
| tst_NAN |
| jeq 1f |
| bset #15,%d1 |
| bset #7,%d1 |
| move.l %d1,(FPD_FPSR,FPDATA) |
| 1: and.w #0xf,%d0 |
| jmp ([0f:w,%pc,%d0.w*4]) |
| |
| .align 4 |
| 0: |
| .long fp_f , fp_eq , fp_ogt, fp_oge |
| .long fp_olt, fp_ole, fp_ogl, fp_or |
| .long fp_un , fp_ueq, fp_ugt, fp_uge |
| .long fp_ult, fp_ule, fp_ne , fp_t |
| |
| fp_f: |
| moveq #0,%d0 |
| rts |
| |
| fp_eq: |
| moveq #0,%d0 |
| tst_Z |
| jeq 1f |
| moveq #-1,%d0 |
| 1: rts |
| |
| fp_ogt: |
| moveq #0,%d0 |
| tst_NAN |
| jne 1f |
| tst_Z |
| jne 1f |
| tst_N |
| jne 1f |
| moveq #-1,%d0 |
| 1: rts |
| |
| fp_oge: |
| moveq #-1,%d0 |
| tst_Z |
| jne 2f |
| tst_NAN |
| jne 1f |
| tst_N |
| jeq 2f |
| 1: moveq #0,%d0 |
| 2: rts |
| |
| fp_olt: |
| moveq #0,%d0 |
| tst_NAN |
| jne 1f |
| tst_Z |
| jne 1f |
| tst_N |
| jeq 1f |
| moveq #-1,%d0 |
| 1: rts |
| |
| fp_ole: |
| moveq #-1,%d0 |
| tst_Z |
| jne 2f |
| tst_NAN |
| jne 1f |
| tst_N |
| jne 2f |
| 1: moveq #0,%d0 |
| 2: rts |
| |
| fp_ogl: |
| moveq #0,%d0 |
| tst_NAN |
| jne 1f |
| tst_Z |
| jne 1f |
| moveq #-1,%d0 |
| 1: rts |
| |
| fp_or: |
| moveq #0,%d0 |
| tst_NAN |
| jne 1f |
| moveq #-1,%d0 |
| 1: rts |
| |
| fp_un: |
| moveq #0,%d0 |
| tst_NAN |
| jeq 1f |
| moveq #-1,%d0 |
| rts |
| |
| fp_ueq: |
| moveq #-1,%d0 |
| tst_NAN |
| jne 1f |
| tst_Z |
| jne 1f |
| moveq #0,%d0 |
| 1: rts |
| |
| fp_ugt: |
| moveq #-1,%d0 |
| tst_NAN |
| jne 2f |
| tst_N |
| jne 1f |
| tst_Z |
| jeq 2f |
| 1: moveq #0,%d0 |
| 2: rts |
| |
| fp_uge: |
| moveq #-1,%d0 |
| tst_NAN |
| jne 1f |
| tst_Z |
| jne 1f |
| tst_N |
| jeq 1f |
| moveq #0,%d0 |
| 1: rts |
| |
| fp_ult: |
| moveq #-1,%d0 |
| tst_NAN |
| jne 2f |
| tst_Z |
| jne 1f |
| tst_N |
| jne 2f |
| 1: moveq #0,%d0 |
| 2: rts |
| |
| fp_ule: |
| moveq #-1,%d0 |
| tst_NAN |
| jne 1f |
| tst_Z |
| jne 1f |
| tst_N |
| jne 1f |
| moveq #0,%d0 |
| 1: rts |
| |
| fp_ne: |
| moveq #0,%d0 |
| tst_Z |
| jne 1f |
| moveq #-1,%d0 |
| 1: rts |
| |
| fp_t: |
| moveq #-1,%d0 |
| rts |
