syscall: call getfsstat via libc on openbsd

On openbsd, call getfsstat directly via libc, instead of calling it
via syscall.Syscall.

Updates golang/go#63900

Change-Id: I99a3555b3207754b107dbabf63440569fca93eea
Reviewed-on: https://go-review.googlesource.com/c/sys/+/538976
Reviewed-by: Cherry Mui <cherryyz@google.com>
Run-TryBot: Joel Sing <joel@sing.id.au>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Josh Rickmar <jrick@zettaport.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

unix/syscall_openbsd.go

@@ -137,18 +137,13 @@ func sendfile(outfd int, infd int, offset *int64, count int) (written int, err e
 }
 
 func Getfsstat(buf []Statfs_t, flags int) (n int, err error) {
-	var _p0 unsafe.Pointer
+	var bufptr *Statfs_t
 	var bufsize uintptr
 	if len(buf) > 0 {
-		_p0 = unsafe.Pointer(&buf[0])
+		bufptr = &buf[0]
 		bufsize = unsafe.Sizeof(Statfs_t{}) * uintptr(len(buf))
 	}
-	r0, _, e1 := Syscall(SYS_GETFSSTAT, uintptr(_p0), bufsize, uintptr(flags))
+	return getfsstat(bufptr, bufsize, flags)
-	n = int(r0)
-	if e1 != 0 {
-		err = e1
-	}
-	return
 }
 
 //sysnb	getresuid(ruid *_C_int, euid *_C_int, suid *_C_int)
@@ -326,6 +321,7 @@ func Uname(uname *Utsname) error {
 //sys	write(fd int, p []byte) (n int, err error)
 //sys	mmap(addr uintptr, length uintptr, prot int, flag int, fd int, pos int64) (ret uintptr, err error)
 //sys	munmap(addr uintptr, length uintptr) (err error)
+//sys	getfsstat(stat *Statfs_t, bufsize uintptr, flags int) (n int, err error)
 //sys	utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error)
 //sys	pledge(promises *byte, execpromises *byte) (err error)
 //sys	unveil(path *byte, flags *byte) (err error)

unix/zsyscall_openbsd_386.go

@@ -2212,6 +2212,21 @@ var libc_munmap_trampoline_addr uintptr
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func getfsstat(stat *Statfs_t, bufsize uintptr, flags int) (n int, err error) {
+	r0, _, e1 := syscall_syscall(libc_getfsstat_trampoline_addr, uintptr(unsafe.Pointer(stat)), uintptr(bufsize), uintptr(flags))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+var libc_getfsstat_trampoline_addr uintptr
+
+//go:cgo_import_dynamic libc_getfsstat getfsstat "libc.so"
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)

unix/zsyscall_openbsd_386.s

@@ -668,6 +668,11 @@ TEXT libc_munmap_trampoline<>(SB),NOSPLIT,$0-0
 GLOBL	·libc_munmap_trampoline_addr(SB), RODATA, $4
 DATA	·libc_munmap_trampoline_addr(SB)/4, $libc_munmap_trampoline<>(SB)
 
+TEXT libc_getfsstat_trampoline<>(SB),NOSPLIT,$0-0
+	JMP	libc_getfsstat(SB)
+GLOBL	·libc_getfsstat_trampoline_addr(SB), RODATA, $4
+DATA	·libc_getfsstat_trampoline_addr(SB)/4, $libc_getfsstat_trampoline<>(SB)
+
 TEXT libc_utimensat_trampoline<>(SB),NOSPLIT,$0-0
 	JMP	libc_utimensat(SB)
 GLOBL	·libc_utimensat_trampoline_addr(SB), RODATA, $4

unix/zsyscall_openbsd_amd64.go

@@ -2212,6 +2212,21 @@ var libc_munmap_trampoline_addr uintptr
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func getfsstat(stat *Statfs_t, bufsize uintptr, flags int) (n int, err error) {
+	r0, _, e1 := syscall_syscall(libc_getfsstat_trampoline_addr, uintptr(unsafe.Pointer(stat)), uintptr(bufsize), uintptr(flags))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+var libc_getfsstat_trampoline_addr uintptr
+
+//go:cgo_import_dynamic libc_getfsstat getfsstat "libc.so"
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)

unix/zsyscall_openbsd_amd64.s

@@ -668,6 +668,11 @@ TEXT libc_munmap_trampoline<>(SB),NOSPLIT,$0-0
 GLOBL	·libc_munmap_trampoline_addr(SB), RODATA, $8
 DATA	·libc_munmap_trampoline_addr(SB)/8, $libc_munmap_trampoline<>(SB)
 
+TEXT libc_getfsstat_trampoline<>(SB),NOSPLIT,$0-0
+	JMP	libc_getfsstat(SB)
+GLOBL	·libc_getfsstat_trampoline_addr(SB), RODATA, $8
+DATA	·libc_getfsstat_trampoline_addr(SB)/8, $libc_getfsstat_trampoline<>(SB)
+
 TEXT libc_utimensat_trampoline<>(SB),NOSPLIT,$0-0
 	JMP	libc_utimensat(SB)
 GLOBL	·libc_utimensat_trampoline_addr(SB), RODATA, $8

unix/zsyscall_openbsd_arm.go

@@ -2212,6 +2212,21 @@ var libc_munmap_trampoline_addr uintptr
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func getfsstat(stat *Statfs_t, bufsize uintptr, flags int) (n int, err error) {
+	r0, _, e1 := syscall_syscall(libc_getfsstat_trampoline_addr, uintptr(unsafe.Pointer(stat)), uintptr(bufsize), uintptr(flags))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+var libc_getfsstat_trampoline_addr uintptr
+
+//go:cgo_import_dynamic libc_getfsstat getfsstat "libc.so"
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)

unix/zsyscall_openbsd_arm.s

@@ -668,6 +668,11 @@ TEXT libc_munmap_trampoline<>(SB),NOSPLIT,$0-0
 GLOBL	·libc_munmap_trampoline_addr(SB), RODATA, $4
 DATA	·libc_munmap_trampoline_addr(SB)/4, $libc_munmap_trampoline<>(SB)
 
+TEXT libc_getfsstat_trampoline<>(SB),NOSPLIT,$0-0
+	JMP	libc_getfsstat(SB)
+GLOBL	·libc_getfsstat_trampoline_addr(SB), RODATA, $4
+DATA	·libc_getfsstat_trampoline_addr(SB)/4, $libc_getfsstat_trampoline<>(SB)
+
 TEXT libc_utimensat_trampoline<>(SB),NOSPLIT,$0-0
 	JMP	libc_utimensat(SB)
 GLOBL	·libc_utimensat_trampoline_addr(SB), RODATA, $4

unix/zsyscall_openbsd_arm64.go

@@ -2212,6 +2212,21 @@ var libc_munmap_trampoline_addr uintptr
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func getfsstat(stat *Statfs_t, bufsize uintptr, flags int) (n int, err error) {
+	r0, _, e1 := syscall_syscall(libc_getfsstat_trampoline_addr, uintptr(unsafe.Pointer(stat)), uintptr(bufsize), uintptr(flags))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+var libc_getfsstat_trampoline_addr uintptr
+
+//go:cgo_import_dynamic libc_getfsstat getfsstat "libc.so"
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)

unix/zsyscall_openbsd_arm64.s

@@ -668,6 +668,11 @@ TEXT libc_munmap_trampoline<>(SB),NOSPLIT,$0-0
 GLOBL	·libc_munmap_trampoline_addr(SB), RODATA, $8
 DATA	·libc_munmap_trampoline_addr(SB)/8, $libc_munmap_trampoline<>(SB)
 
+TEXT libc_getfsstat_trampoline<>(SB),NOSPLIT,$0-0
+	JMP	libc_getfsstat(SB)
+GLOBL	·libc_getfsstat_trampoline_addr(SB), RODATA, $8
+DATA	·libc_getfsstat_trampoline_addr(SB)/8, $libc_getfsstat_trampoline<>(SB)
+
 TEXT libc_utimensat_trampoline<>(SB),NOSPLIT,$0-0
 	JMP	libc_utimensat(SB)
 GLOBL	·libc_utimensat_trampoline_addr(SB), RODATA, $8

unix/zsyscall_openbsd_mips64.go

@@ -2212,6 +2212,21 @@ var libc_munmap_trampoline_addr uintptr
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func getfsstat(stat *Statfs_t, bufsize uintptr, flags int) (n int, err error) {
+	r0, _, e1 := syscall_syscall(libc_getfsstat_trampoline_addr, uintptr(unsafe.Pointer(stat)), uintptr(bufsize), uintptr(flags))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+var libc_getfsstat_trampoline_addr uintptr
+
+//go:cgo_import_dynamic libc_getfsstat getfsstat "libc.so"
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)

unix/zsyscall_openbsd_mips64.s

@@ -668,6 +668,11 @@ TEXT libc_munmap_trampoline<>(SB),NOSPLIT,$0-0
 GLOBL	·libc_munmap_trampoline_addr(SB), RODATA, $8
 DATA	·libc_munmap_trampoline_addr(SB)/8, $libc_munmap_trampoline<>(SB)
 
+TEXT libc_getfsstat_trampoline<>(SB),NOSPLIT,$0-0
+	JMP	libc_getfsstat(SB)
+GLOBL	·libc_getfsstat_trampoline_addr(SB), RODATA, $8
+DATA	·libc_getfsstat_trampoline_addr(SB)/8, $libc_getfsstat_trampoline<>(SB)
+
 TEXT libc_utimensat_trampoline<>(SB),NOSPLIT,$0-0
 	JMP	libc_utimensat(SB)
 GLOBL	·libc_utimensat_trampoline_addr(SB), RODATA, $8

unix/zsyscall_openbsd_ppc64.go

@@ -2212,6 +2212,21 @@ var libc_munmap_trampoline_addr uintptr
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func getfsstat(stat *Statfs_t, bufsize uintptr, flags int) (n int, err error) {
+	r0, _, e1 := syscall_syscall(libc_getfsstat_trampoline_addr, uintptr(unsafe.Pointer(stat)), uintptr(bufsize), uintptr(flags))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+var libc_getfsstat_trampoline_addr uintptr
+
+//go:cgo_import_dynamic libc_getfsstat getfsstat "libc.so"
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)

unix/zsyscall_openbsd_ppc64.s

@@ -801,6 +801,12 @@ TEXT libc_munmap_trampoline<>(SB),NOSPLIT,$0-0
 GLOBL	·libc_munmap_trampoline_addr(SB), RODATA, $8
 DATA	·libc_munmap_trampoline_addr(SB)/8, $libc_munmap_trampoline<>(SB)
 
+TEXT libc_getfsstat_trampoline<>(SB),NOSPLIT,$0-0
+	CALL	libc_getfsstat(SB)
+	RET
+GLOBL	·libc_getfsstat_trampoline_addr(SB), RODATA, $8
+DATA	·libc_getfsstat_trampoline_addr(SB)/8, $libc_getfsstat_trampoline<>(SB)
+
 TEXT libc_utimensat_trampoline<>(SB),NOSPLIT,$0-0
 	CALL	libc_utimensat(SB)
 	RET

unix/zsyscall_openbsd_riscv64.go

@@ -2212,6 +2212,21 @@ var libc_munmap_trampoline_addr uintptr
 
 // THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
 
+func getfsstat(stat *Statfs_t, bufsize uintptr, flags int) (n int, err error) {
+	r0, _, e1 := syscall_syscall(libc_getfsstat_trampoline_addr, uintptr(unsafe.Pointer(stat)), uintptr(bufsize), uintptr(flags))
+	n = int(r0)
+	if e1 != 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+var libc_getfsstat_trampoline_addr uintptr
+
+//go:cgo_import_dynamic libc_getfsstat getfsstat "libc.so"
+
+// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
+
 func utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error) {
 	var _p0 *byte
 	_p0, err = BytePtrFromString(path)

unix/zsyscall_openbsd_riscv64.s

@@ -668,6 +668,11 @@ TEXT libc_munmap_trampoline<>(SB),NOSPLIT,$0-0
 GLOBL	·libc_munmap_trampoline_addr(SB), RODATA, $8
 DATA	·libc_munmap_trampoline_addr(SB)/8, $libc_munmap_trampoline<>(SB)
 
+TEXT libc_getfsstat_trampoline<>(SB),NOSPLIT,$0-0
+	JMP	libc_getfsstat(SB)
+GLOBL	·libc_getfsstat_trampoline_addr(SB), RODATA, $8
+DATA	·libc_getfsstat_trampoline_addr(SB)/8, $libc_getfsstat_trampoline<>(SB)
+
 TEXT libc_utimensat_trampoline<>(SB),NOSPLIT,$0-0
 	JMP	libc_utimensat(SB)
 GLOBL	·libc_utimensat_trampoline_addr(SB), RODATA, $8