diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 18:20:36 -0400 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/m68k/fpsp040/x_fline.S |
Linux-2.6.12-rc2v2.6.12-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!
Diffstat (limited to 'arch/m68k/fpsp040/x_fline.S')
-rw-r--r-- | arch/m68k/fpsp040/x_fline.S | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/arch/m68k/fpsp040/x_fline.S b/arch/m68k/fpsp040/x_fline.S new file mode 100644 index 000000000000..3917710b0fde --- /dev/null +++ b/arch/m68k/fpsp040/x_fline.S | |||
@@ -0,0 +1,104 @@ | |||
1 | | | ||
2 | | x_fline.sa 3.3 1/10/91 | ||
3 | | | ||
4 | | fpsp_fline --- FPSP handler for fline exception | ||
5 | | | ||
6 | | First determine if the exception is one of the unimplemented | ||
7 | | floating point instructions. If so, let fpsp_unimp handle it. | ||
8 | | Next, determine if the instruction is an fmovecr with a non-zero | ||
9 | | <ea> field. If so, handle here and return. Otherwise, it | ||
10 | | must be a real F-line exception. | ||
11 | | | ||
12 | |||
13 | | Copyright (C) Motorola, Inc. 1990 | ||
14 | | All Rights Reserved | ||
15 | | | ||
16 | | THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF MOTOROLA | ||
17 | | The copyright notice above does not evidence any | ||
18 | | actual or intended publication of such source code. | ||
19 | |||
20 | X_FLINE: |idnt 2,1 | Motorola 040 Floating Point Software Package | ||
21 | |||
22 | |section 8 | ||
23 | |||
24 | #include "fpsp.h" | ||
25 | |||
26 | |xref real_fline | ||
27 | |xref fpsp_unimp | ||
28 | |xref uni_2 | ||
29 | |xref mem_read | ||
30 | |xref fpsp_fmt_error | ||
31 | |||
32 | .global fpsp_fline | ||
33 | fpsp_fline: | ||
34 | | | ||
35 | | check for unimplemented vector first. Use EXC_VEC-4 because | ||
36 | | the equate is valid only after a 'link a6' has pushed one more | ||
37 | | long onto the stack. | ||
38 | | | ||
39 | cmpw #UNIMP_VEC,EXC_VEC-4(%a7) | ||
40 | beql fpsp_unimp | ||
41 | |||
42 | | | ||
43 | | fmovecr with non-zero <ea> handling here | ||
44 | | | ||
45 | subl #4,%a7 |4 accounts for 2-word difference | ||
46 | | ;between six word frame (unimp) and | ||
47 | | ;four word frame | ||
48 | link %a6,#-LOCAL_SIZE | ||
49 | fsave -(%a7) | ||
50 | moveml %d0-%d1/%a0-%a1,USER_DA(%a6) | ||
51 | moveal EXC_PC+4(%a6),%a0 |get address of fline instruction | ||
52 | leal L_SCR1(%a6),%a1 |use L_SCR1 as scratch | ||
53 | movel #4,%d0 | ||
54 | addl #4,%a6 |to offset the sub.l #4,a7 above so that | ||
55 | | ;a6 can point correctly to the stack frame | ||
56 | | ;before branching to mem_read | ||
57 | bsrl mem_read | ||
58 | subl #4,%a6 | ||
59 | movel L_SCR1(%a6),%d0 |d0 contains the fline and command word | ||
60 | bfextu %d0{#4:#3},%d1 |extract coprocessor id | ||
61 | cmpib #1,%d1 |check if cpid=1 | ||
62 | bne not_mvcr |exit if not | ||
63 | bfextu %d0{#16:#6},%d1 | ||
64 | cmpib #0x17,%d1 |check if it is an FMOVECR encoding | ||
65 | bne not_mvcr | ||
66 | | ;if an FMOVECR instruction, fix stack | ||
67 | | ;and go to FPSP_UNIMP | ||
68 | fix_stack: | ||
69 | cmpib #VER_40,(%a7) |test for orig unimp frame | ||
70 | bnes ck_rev | ||
71 | subl #UNIMP_40_SIZE-4,%a7 |emulate an orig fsave | ||
72 | moveb #VER_40,(%a7) | ||
73 | moveb #UNIMP_40_SIZE-4,1(%a7) | ||
74 | clrw 2(%a7) | ||
75 | bras fix_con | ||
76 | ck_rev: | ||
77 | cmpib #VER_41,(%a7) |test for rev unimp frame | ||
78 | bnel fpsp_fmt_error |if not $40 or $41, exit with error | ||
79 | subl #UNIMP_41_SIZE-4,%a7 |emulate a rev fsave | ||
80 | moveb #VER_41,(%a7) | ||
81 | moveb #UNIMP_41_SIZE-4,1(%a7) | ||
82 | clrw 2(%a7) | ||
83 | fix_con: | ||
84 | movew EXC_SR+4(%a6),EXC_SR(%a6) |move stacked sr to new position | ||
85 | movel EXC_PC+4(%a6),EXC_PC(%a6) |move stacked pc to new position | ||
86 | fmovel EXC_PC(%a6),%FPIAR |point FPIAR to fline inst | ||
87 | movel #4,%d1 | ||
88 | addl %d1,EXC_PC(%a6) |increment stacked pc value to next inst | ||
89 | movew #0x202c,EXC_VEC(%a6) |reformat vector to unimp | ||
90 | clrl EXC_EA(%a6) |clear the EXC_EA field | ||
91 | movew %d0,CMDREG1B(%a6) |move the lower word into CMDREG1B | ||
92 | clrl E_BYTE(%a6) | ||
93 | bsetb #UFLAG,T_BYTE(%a6) | ||
94 | moveml USER_DA(%a6),%d0-%d1/%a0-%a1 |restore data registers | ||
95 | bral uni_2 | ||
96 | |||
97 | not_mvcr: | ||
98 | moveml USER_DA(%a6),%d0-%d1/%a0-%a1 |restore data registers | ||
99 | frestore (%a7)+ | ||
100 | unlk %a6 | ||
101 | addl #4,%a7 | ||
102 | bral real_fline | ||
103 | |||
104 | |end | ||