From a647d4a4d15df856d590c39c19d3973ec2e18825 Mon Sep 17 00:00:00 2001 From: Warner Losh Date: Thu, 14 Jul 2022 23:19:18 -0600 Subject: [PATCH] kboot: Implement stat(2) and fstat(2) system calls Implement stat(2) and fstat(2) in terms of newfstatat and newfstat system calls respectively (assume we have a compat #define when there's no newfstat and just a regular fstat and do so for ppc). Snag struct kstat (the Linux kernel stat(2), et al interface) from musl and attribute properly. Sponsored by: Netflix --- stand/kboot/arch/amd64/stat_arch.h | 31 +++++++++++++++++++++++++ stand/kboot/arch/amd64/syscall_nr.h | 2 ++ stand/kboot/arch/powerpc64/stat_arch.h | 27 +++++++++++++++++++++ stand/kboot/arch/powerpc64/syscall_nr.h | 3 +++ stand/kboot/host_syscall.h | 17 ++++++++++++++ stand/kboot/host_syscalls.c | 12 ++++++++++ 6 files changed, 92 insertions(+) create mode 100644 stand/kboot/arch/amd64/stat_arch.h create mode 100644 stand/kboot/arch/powerpc64/stat_arch.h diff --git a/stand/kboot/arch/amd64/stat_arch.h b/stand/kboot/arch/amd64/stat_arch.h new file mode 100644 index 000000000000..ae180322fab4 --- /dev/null +++ b/stand/kboot/arch/amd64/stat_arch.h @@ -0,0 +1,31 @@ +/* + * Copyright (c) 2005-2020 Rich Felker, et al. + * + * SPDX-Licnse-Identifier: MIT + * + * Note: From the musl project + */ + +struct host_kstat { + host_dev_t st_dev; + host_ino_t st_ino; + host_nlink_t st_nlink; + + host_mode_t st_mode; + host_uid_t st_uid; + host_gid_t st_gid; + unsigned int __pad0; + host_dev_t st_rdev; + host_off_t st_size; + host_blksize_t st_blksize; + host_blkcnt_t st_blocks; + + long st_atime_sec; + long st_atime_nsec; + long st_mtime_sec; + long st_mtime_nsec; + long st_ctime_sec; + long st_ctime_nsec; + long __pad_for_future[3]; +}; + diff --git a/stand/kboot/arch/amd64/syscall_nr.h b/stand/kboot/arch/amd64/syscall_nr.h index 506f85b3e731..c22c80ea7cb9 100644 --- a/stand/kboot/arch/amd64/syscall_nr.h +++ b/stand/kboot/arch/amd64/syscall_nr.h @@ -4,6 +4,8 @@ #define SYS_kexec_load 246 #define SYS_lseek 8 #define SYS_mmap 9 +#define SYS_newfstat 5 +#define SYS_newfstatat 262 #define SYS_openat 257 #define SYS_pselect6 270 #define SYS_read 0 diff --git a/stand/kboot/arch/powerpc64/stat_arch.h b/stand/kboot/arch/powerpc64/stat_arch.h new file mode 100644 index 000000000000..f22787b45feb --- /dev/null +++ b/stand/kboot/arch/powerpc64/stat_arch.h @@ -0,0 +1,27 @@ +/* + * Copyright (c) 2005-2020 Rich Felker, et al. + * + * SPDX-Licnse-Identifier: MIT + * + * Note: From the musl project + */ + +struct host_kstat { + host_dev_t st_dev; + host_ino_t st_ino; + host_nlink_t st_nlink; + host_mode_t st_mode; + host_uid_t st_uid; + host_gid_t st_gid; + host_dev_t st_rdev; + host_off_t st_size; + host_blksize_t st_blksize; + host_blkcnt_t st_blocks; + long st_atime_sec; + long st_atime_nsec; + long st_mtime_sec; + long st_mtime_nsec; + long st_ctime_sec; + long st_ctime_nsec; + long __pad_for_future[3]; +}; diff --git a/stand/kboot/arch/powerpc64/syscall_nr.h b/stand/kboot/arch/powerpc64/syscall_nr.h index 592f3d6a7631..aa94e6a82bb7 100644 --- a/stand/kboot/arch/powerpc64/syscall_nr.h +++ b/stand/kboot/arch/powerpc64/syscall_nr.h @@ -1,9 +1,12 @@ #define SYS_close 6 +#define SYS_fstat 108 #define SYS_getdents 141 #define SYS_gettimeofday 78 #define SYS_kexec_load 268 #define SYS_llseek 140 #define SYS_mmap 90 +#define SYS_newfstat SYS_fstat +#define SYS_newfstatat 291 #define SYS_openat 286 #define SYS_pselect6 280 #define SYS_read 3 diff --git a/stand/kboot/host_syscall.h b/stand/kboot/host_syscall.h index 24b966b34ed8..6ff20f7ba393 100644 --- a/stand/kboot/host_syscall.h +++ b/stand/kboot/host_syscall.h @@ -32,6 +32,21 @@ long host_syscall(int number, ...); +/* + * Sizes taken from musl's include/alltypes.h.in and expanded for LP64 hosts + */ +typedef uint64_t host_dev_t; +typedef uint64_t host_ino_t; +typedef int64_t host_nlink_t; +typedef unsigned int host_mode_t; +typedef unsigned int host_uid_t; +typedef unsigned int host_gid_t; +typedef int64_t host_off_t; +typedef long host_blksize_t; +typedef int64_t host_blkcnt_t; + +#include "stat_arch.h" + /* * Constants for open, fcntl, etc * @@ -75,6 +90,7 @@ struct host_timeval { * System Calls */ int host_close(int fd); +int host_fstat(int fd, struct host_kstat *sb); int host_getdents(int fd, void *dirp, int count); int host_gettimeofday(struct host_timeval *a, void *b); int host_kexec_load(uint32_t start, int nsegs, uint32_t segs, uint32_t flags); @@ -85,6 +101,7 @@ ssize_t host_read(int fd, void *buf, size_t nbyte); int host_reboot(int, int, int, uintptr_t); int host_select(int nfds, long *readfds, long *writefds, long *exceptfds, struct host_timeval *timeout); +int host_stat(const char *path, struct host_kstat *sb); int host_uname(struct old_utsname *); ssize_t host_write(int fd, const void *buf, size_t nbyte); diff --git a/stand/kboot/host_syscalls.c b/stand/kboot/host_syscalls.c index 3db066acb781..9cc6c6cd873e 100644 --- a/stand/kboot/host_syscalls.c +++ b/stand/kboot/host_syscalls.c @@ -13,6 +13,12 @@ host_close(int fd) return host_syscall(SYS_close, fd); } +int +host_fstat(int fd, struct host_kstat *sb) +{ + return host_syscall(SYS_newfstat, fd, (uintptr_t)sb); +} + int host_getdents(int fd, void *dirp, int count) { @@ -86,6 +92,12 @@ host_select(int nfds, long *readfds, long *writefds, long *exceptfds, (uintptr_t)exceptfds, (uintptr_t)&ts, (uintptr_t)NULL); } +int +host_stat(const char *path, struct host_kstat *sb) +{ + return host_syscall(SYS_newfstatat, HOST_AT_FDCWD, (uintptr_t)path, (uintptr_t)sb, 0); +} + int host_uname(struct old_utsname *uts) {