1 # Reads OpenPOWER ISA pages from http://libre-riscv.org/openpower/isa
2 """OpenPOWER ISA page parser
4 returns an OrderedDict of namedtuple "Ops" containing details of all
5 instructions listed in markdown files.
7 format must be strictly as follows (no optional sections) including whitespace:
15 if L = 0 then a <- [0]*32 || (RA)[32:63]
16 b <- [0]*32 || (RB)[32:63]
19 if a <u b then c <- 0b100
20 else if a >u b then c <- 0b010
22 CR[4*BF+32:4*BF+35] <- c || XER[SO]
24 Special Registers Altered:
35 * instruction registerlist
36 * instruction registerlist
38 4-space-indented pseudo-code
39 4-space-indented pseudo-code
41 Special Registers Altered:
42 4-space-indented register description
44 blank(s) (optional for convenience at end-of-page)
47 from collections
import namedtuple
, OrderedDict
51 opfields
= ("desc", "form", "opcode", "regs", "pcode", "sregs", "page")
52 Ops
= namedtuple("Ops", opfields
)
56 fdir
= os
.path
.abspath(os
.path
.dirname(__file__
))
57 fdir
= os
.path
.split(fdir
)[0]
58 fdir
= os
.path
.split(fdir
)[0]
59 fdir
= os
.path
.split(fdir
)[0]
60 fdir
= os
.path
.split(fdir
)[0]
61 return os
.path
.join(fdir
, "libreriscv", "openpower", "isa")
67 self
.instr
= OrderedDict()
70 for pth
in os
.listdir(os
.path
.join(get_isa_dir())):
71 print (get_isa_dir(), pth
)
72 assert pth
.endswith(".mdwn"), "only %s in isa dir" % pth
75 def read_file(self
, fname
):
76 pagename
= fname
.split('.')[0]
77 fname
= os
.path
.join(get_isa_dir(), fname
)
78 with
open(fname
) as f
:
81 # set up dict with current page name
82 d
= {'page': pagename
}
84 l
= lines
.pop(0).rstrip() # get first line
88 assert l
.startswith('#'), ("# not found in line %s" % l
)
89 d
['desc'] = l
[1:].strip()
92 l
= lines
.pop(0).strip()
94 assert len(l
) == 0, ("blank line not found %s" % l
)
97 l
= lines
.pop(0).strip()
98 assert l
.endswith('-Form'), ("line with -Form expected %s" % l
)
99 d
['form'] = l
.split('-')[0]
101 # whitespace expected
102 l
= lines
.pop(0).strip()
103 assert len(l
) == 0, ("blank line not found %s" % l
)
105 # get list of opcodes
108 l
= lines
.pop(0).strip()
109 if len(l
) == 0: break
110 assert l
.startswith('*'), ("* not found in line %s" % l
)
111 l
= l
[1:].split(' ') # lose star
112 l
= filter(lambda x
: len(x
) != 0, l
) # strip blanks
119 l
= lines
.pop(0).rstrip()
120 if len(l
) == 0: break
121 assert l
.startswith(' '), ("4spcs not found in line %s" % l
)
122 l
= l
[4:] # lose 4 spaces
126 # "Special Registers Altered" expected
127 l
= lines
.pop(0).rstrip()
128 assert l
.startswith("Special"), ("special not found %s" % l
)
130 # whitespace expected
131 l
= lines
.pop(0).strip()
132 assert len(l
) == 0, ("blank line not found %s" % l
)
137 l
= lines
.pop(0).rstrip()
138 if len(l
) == 0: break
139 assert l
.startswith(' '), ("4spcs not found in line %s" % l
)
140 l
= l
[4:] # lose 4 spaces
148 # expect and drop whitespace
150 l
= lines
.pop(0).rstrip()
151 if len(l
) != 0: break
153 def add_op(self
, o
, d
):
154 opcode
, regs
= o
[0], o
[1:]
157 regs
[0] = regs
[0].split(",")
158 op
['opcode'] = opcode
159 self
.instr
[opcode
] = Ops(**op
)
161 # create list of instructions by form
163 fl
= self
.forms
.get(form
, [])
164 self
.forms
[form
] = fl
+ [opcode
]
166 # create list of instructions by page
168 pl
= self
.page
.get(page
, [])
169 self
.page
[page
] = pl
+ [opcode
]
171 def pprint_ops(self
):
172 for k
, v
in self
.instr
.items():
173 print ("# %s %s" % (v
.opcode
, v
.desc
))
174 print ("Form: %s Regs: %s" % (v
.form
, v
.regs
))
175 print ('\n'.join(map(lambda x
: " %s" % x
, v
.pcode
)))
177 print ('\n'.join(map(lambda x
: " %s" % x
, v
.sregs
)))
179 for k
, v
in isa
.forms
.items():
182 if __name__
== '__main__':