1 #!/usr/bin/env bash
2 # Copyright 2009 The Go Authors. All rights reserved.
3 # Use of this source code is governed by a BSD-style
4 # license that can be found in the LICENSE file.
5
6 # The plan9 package provides access to the raw system call
7 # interface of the underlying operating system. Porting Go to
8 # a new architecture/operating system combination requires
9 # some manual effort, though there are tools that automate
10 # much of the process. The auto-generated files have names
11 # beginning with z.
12 #
13 # This script runs or (given -n) prints suggested commands to generate z files
14 # for the current system. Running those commands is not automatic.
15 # This script is documentation more than anything else.
16 #
17 # * asm_${GOOS}_${GOARCH}.s
18 #
19 # This hand-written assembly file implements system call dispatch.
20 # There are three entry points:
21 #
22 # func Syscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr);
23 # func Syscall6(trap, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, err uintptr);
24 # func RawSyscall(trap, a1, a2, a3 uintptr) (r1, r2, err uintptr);
25 #
26 # The first and second are the standard ones; they differ only in
27 # how many arguments can be passed to the kernel.
28 # The third is for low-level use by the ForkExec wrapper;
29 # unlike the first two, it does not call into the scheduler to
30 # let it know that a system call is running.
31 #
32 # * syscall_${GOOS}.go
33 #
34 # This hand-written Go file implements system calls that need
35 # special handling and lists "//sys" comments giving prototypes
36 # for ones that can be auto-generated. Mksyscall reads those
37 # comments to generate the stubs.
38 #
39 # * syscall_${GOOS}_${GOARCH}.go
40 #
41 # Same as syscall_${GOOS}.go except that it contains code specific
42 # to ${GOOS} on one particular architecture.
43 #
44 # * types_${GOOS}.c
45 #
46 # This hand-written C file includes standard C headers and then
47 # creates typedef or enum names beginning with a dollar sign
48 # (use of $ in variable names is a gcc extension). The hardest
49 # part about preparing this file is figuring out which headers to
50 # include and which symbols need to be #defined to get the
51 # actual data structures that pass through to the kernel system calls.
52 # Some C libraries present alternate versions for binary compatibility
53 # and translate them on the way in and out of system calls, but
54 # there is almost always a #define that can get the real ones.
55 # See types_darwin.c and types_linux.c for examples.
56 #
57 # * zerror_${GOOS}_${GOARCH}.go
58 #
59 # This machine-generated file defines the system's error numbers,
60 # error strings, and signal numbers. The generator is "mkerrors.sh".
61 # Usually no arguments are needed, but mkerrors.sh will pass its
62 # arguments on to godefs.
63 #
64 # * zsyscall_${GOOS}_${GOARCH}.go
65 #
66 # Generated by mksyscall.pl; see syscall_${GOOS}.go above.
67 #
68 # * zsysnum_${GOOS}_${GOARCH}.go
69 #
70 # Generated by mksysnum_${GOOS}.
71 #
72 # * ztypes_${GOOS}_${GOARCH}.go
73 #
74 # Generated by godefs; see types_${GOOS}.c above.
75
76 GOOSARCH="${GOOS}_${GOARCH}"
77
78 # defaults
79 mksyscall="go run mksyscall.go"
80 mkerrors="./mkerrors.sh"
81 zerrors="zerrors_$GOOSARCH.go"
82 mksysctl=""
83 zsysctl="zsysctl_$GOOSARCH.go"
84 mksysnum=
85 mktypes=
86 run="sh"
87
88 case "$1" in
89 -syscalls)
90 for i in zsyscall*go
91 do
92 sed 1q $i | sed 's;^// ;;' | sh > _$i && gofmt < _$i > $i
93 rm _$i
94 done
95 exit 0
96 ;;
97 -n)
98 run="cat"
99 shift
100 esac
101
102 case "$#" in
103 0)
104 ;;
105 *)
106 echo 'usage: mkall.sh [-n]' 1>&2
107 exit 2
108 esac
109
110 case "$GOOSARCH" in
111 _* | *_ | _)
112 echo 'undefined $GOOS_$GOARCH:' "$GOOSARCH" 1>&2
113 exit 1
114 ;;
115 plan9_386)
116 mkerrors=
117 mksyscall="go run mksyscall.go -l32 -plan9 -tags plan9,386"
118 mksysnum="./mksysnum_plan9.sh /n/sources/plan9/sys/src/libc/9syscall/sys.h"
119 mktypes="XXX"
120 ;;
121 plan9_amd64)
122 mkerrors=
123 mksyscall="go run mksyscall.go -l32 -plan9 -tags plan9,amd64"
124 mksysnum="./mksysnum_plan9.sh /n/sources/plan9/sys/src/libc/9syscall/sys.h"
125 mktypes="XXX"
126 ;;
127 plan9_arm)
128 mkerrors=
129 mksyscall="go run mksyscall.go -l32 -plan9 -tags plan9,arm"
130 mksysnum="./mksysnum_plan9.sh /n/sources/plan9/sys/src/libc/9syscall/sys.h"
131 mktypes="XXX"
132 ;;
133 *)
134 echo 'unrecognized $GOOS_$GOARCH: ' "$GOOSARCH" 1>&2
135 exit 1
136 ;;
137 esac
138
139 (
140 if [ -n "$mkerrors" ]; then echo "$mkerrors |gofmt >$zerrors"; fi
141 case "$GOOS" in
142 plan9)
143 syscall_goos="syscall_$GOOS.go"
144 if [ -n "$mksyscall" ]; then echo "$mksyscall $syscall_goos |gofmt >zsyscall_$GOOSARCH.go"; fi
145 ;;
146 esac
147 if [ -n "$mksysctl" ]; then echo "$mksysctl |gofmt >$zsysctl"; fi
148 if [ -n "$mksysnum" ]; then echo "$mksysnum |gofmt >zsysnum_$GOOSARCH.go"; fi
149 if [ -n "$mktypes" ]; then echo "$mktypes types_$GOOS.go |gofmt >ztypes_$GOOSARCH.go"; fi
150 ) | $run
151
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