diff options
Diffstat (limited to 'c/src/lib/libcpu/m68k/m68040/fpsp/x_fline.S')
| -rw-r--r-- | c/src/lib/libcpu/m68k/m68040/fpsp/x_fline.S | 106 |
1 files changed, 0 insertions, 106 deletions
diff --git a/c/src/lib/libcpu/m68k/m68040/fpsp/x_fline.S b/c/src/lib/libcpu/m68k/m68040/fpsp/x_fline.S deleted file mode 100644 index b4f747c14c..0000000000 --- a/c/src/lib/libcpu/m68k/m68040/fpsp/x_fline.S +++ /dev/null @@ -1,106 +0,0 @@ -#include "fpsp-namespace.h" -// -// -// x_fline.sa 3.3 1/10/91 -// -// fpsp_fline --- FPSP handler for fline exception -// -// First determine if the exception is one of the unimplemented -// floating point instructions. If so, let fpsp_unimp handle it. -// Next, determine if the instruction is an fmovecr with a non-zero -// <ea> field. If so, handle here and return. Otherwise, it -// must be a real F-line exception. -// - -// Copyright (C) Motorola, Inc. 1990 -// All Rights Reserved -// -// THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA -// The copyright notice above does not evidence any -// actual or intended publication of such source code. - -X_FLINE: //idnt 2,1 | Motorola 040 Floating Point Software Package - - |section 8 - -#include "fpsp.defs" - - |xref real_fline - |xref fpsp_unimp - |xref uni_2 - |xref mem_read - |xref fpsp_fmt_error - - .global fpsp_fline -fpsp_fline: -// -// check for unimplemented vector first. Use EXC_VEC-4 because -// the equate is valid only after a 'link a6' has pushed one more -// long onto the stack. -// - cmpw #UNIMP_VEC,EXC_VEC-4(%a7) - beql fpsp_unimp - -// -// fmovecr with non-zero <ea> handling here -// - subl #4,%a7 //4 accounts for 2-word difference -// ;between six word frame (unimp) and -// ;four word frame - link %a6,#-LOCAL_SIZE - fsave -(%a7) - moveml %d0-%d1/%a0-%a1,USER_DA(%a6) - moveal EXC_PC+4(%a6),%a0 //get address of fline instruction - leal L_SCR1(%a6),%a1 //use L_SCR1 as scratch - movel #4,%d0 - addl #4,%a6 //to offset the sub.l #4,a7 above so that -// ;a6 can point correctly to the stack frame -// ;before branching to mem_read - bsrl mem_read - subl #4,%a6 - movel L_SCR1(%a6),%d0 //d0 contains the fline and command word - bfextu %d0{#4:#3},%d1 //extract coprocessor id - cmpib #1,%d1 //check if cpid=1 - bne not_mvcr //exit if not - bfextu %d0{#16:#6},%d1 - cmpib #0x17,%d1 //check if it is an FMOVECR encoding - bne not_mvcr -// ;if an FMOVECR instruction, fix stack -// ;and go to FPSP_UNIMP -fix_stack: - cmpib #VER_40,(%a7) //test for orig unimp frame - bnes ck_rev - subl #UNIMP_40_SIZE-4,%a7 //emulate an orig fsave - moveb #VER_40,(%a7) - moveb #UNIMP_40_SIZE-4,1(%a7) - clrw 2(%a7) - bras fix_con -ck_rev: - cmpib #VER_41,(%a7) //test for rev unimp frame - bnel fpsp_fmt_error //if not $40 or $41, exit with error - subl #UNIMP_41_SIZE-4,%a7 //emulate a rev fsave - moveb #VER_41,(%a7) - moveb #UNIMP_41_SIZE-4,1(%a7) - clrw 2(%a7) -fix_con: - movew EXC_SR+4(%a6),EXC_SR(%a6) //move stacked sr to new position - movel EXC_PC+4(%a6),EXC_PC(%a6) //move stacked pc to new position - fmovel EXC_PC(%a6),%FPIAR //point FPIAR to fline inst - movel #4,%d1 - addl %d1,EXC_PC(%a6) //increment stacked pc value to next inst - movew #0x202c,EXC_VEC(%a6) //reformat vector to unimp - clrl EXC_EA(%a6) //clear the EXC_EA field - movew %d0,CMDREG1B(%a6) //move the lower word into CMDREG1B - clrl E_BYTE(%a6) - bsetb #UFLAG,T_BYTE(%a6) - moveml USER_DA(%a6),%d0-%d1/%a0-%a1 //restore data registers - bral uni_2 - -not_mvcr: - moveml USER_DA(%a6),%d0-%d1/%a0-%a1 //restore data registers - frestore (%a7)+ - unlk %a6 - addl #4,%a7 - bral real_fline - - |end |