diff options
Diffstat (limited to 'unix/mksyscall.go')
| -rw-r--r-- | unix/mksyscall.go | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/unix/mksyscall.go b/unix/mksyscall.go index e9bf2de..c821aca 100644 --- a/unix/mksyscall.go +++ b/unix/mksyscall.go @@ -36,6 +36,7 @@ import ( var ( b32 = flag.Bool("b32", false, "32bit big-endian") l32 = flag.Bool("l32", false, "32bit little-endian") + libc = flag.Bool("libc", false, "libc system calls") plan9 = flag.Bool("plan9", false, "plan9") openbsd = flag.Bool("openbsd", false, "openbsd") netbsd = flag.Bool("netbsd", false, "netbsd") @@ -43,6 +44,8 @@ var ( arm = flag.Bool("arm", false, "arm") // 64-bit value should use (even, odd)-pair tags = flag.String("tags", "", "build tags") filename = flag.String("output", "", "output file name (standard output if omitted)") + + libcPath = "libc.so" ) // cmdLine returns this programs's commandline arguments @@ -124,10 +127,11 @@ func main() { endianness = "little-endian" } - libc := false if goos == "darwin" { - libc = true + libcPath = "/usr/lib/libSystem.B.dylib" + *libc = true } + trampolines := map[string]bool{} text := "" @@ -210,7 +214,7 @@ func main() { text += fmt.Sprintf(" else {\n\t\t_p%d = unsafe.Pointer(&_zero)\n\t}\n", n) args = append(args, fmt.Sprintf("uintptr(_p%d)", n), fmt.Sprintf("uintptr(len(%s))", p.Name)) n++ - } else if p.Type == "int64" && (*openbsd || *netbsd) { + } else if p.Type == "int64" && ((*openbsd && !*libc) || *netbsd) { args = append(args, "0") if endianness == "big-endian" { args = append(args, fmt.Sprintf("uintptr(%s>>32)", p.Name), fmt.Sprintf("uintptr(%s)", p.Name)) @@ -285,10 +289,18 @@ func main() { } var libcFn string - if libc { + if *libc { asm = "syscall_" + strings.ToLower(asm[:1]) + asm[1:] // internal syscall call sysname = strings.TrimPrefix(sysname, "SYS_") // remove SYS_ sysname = strings.ToLower(sysname) // lowercase + if *openbsd && *libc { + switch sysname { + case "__getcwd": + sysname = "getcwd" + case "__sysctl": + sysname = "sysctl" + } + } libcFn = sysname sysname = "libc_" + sysname + "_trampoline_addr" } @@ -360,14 +372,14 @@ func main() { text += "\treturn\n" text += "}\n\n" - if libc && !trampolines[libcFn] { + if *libc && !trampolines[libcFn] { // some system calls share a trampoline, like read and readlen. trampolines[libcFn] = true // Declare assembly trampoline address. text += fmt.Sprintf("var libc_%s_trampoline_addr uintptr\n\n", libcFn) // Assembly trampoline calls the libc_* function, which this magic // redirects to use the function from libSystem. - text += fmt.Sprintf("//go:cgo_import_dynamic libc_%s %s \"/usr/lib/libSystem.B.dylib\"\n", libcFn, libcFn) + text += fmt.Sprintf("//go:cgo_import_dynamic libc_%s %s %q\n", libcFn, libcFn, libcPath) text += "\n" } } |