diff options
Diffstat (limited to 'tools/include/nolibc/nolibc.h')
| -rw-r--r-- | tools/include/nolibc/nolibc.h | 153 |
1 files changed, 115 insertions, 38 deletions
diff --git a/tools/include/nolibc/nolibc.h b/tools/include/nolibc/nolibc.h index e61d36cd4e50..8b7a9830dd22 100644 --- a/tools/include/nolibc/nolibc.h +++ b/tools/include/nolibc/nolibc.h @@ -71,7 +71,7 @@ * * A simple static executable may be built this way : * $ gcc -fno-asynchronous-unwind-tables -fno-ident -s -Os -nostdlib \ - * -static -include nolibc.h -lgcc -o hello hello.c + * -static -include nolibc.h -o hello hello.c -lgcc * * A very useful calling convention table may be found here : * http://man7.org/linux/man-pages/man2/syscall.2.html @@ -81,19 +81,12 @@ * */ -/* Some archs (at least aarch64) don't expose the regular syscalls anymore by - * default, either because they have an "_at" replacement, or because there are - * more modern alternatives. For now we'd rather still use them. - */ -#define __ARCH_WANT_SYSCALL_NO_AT -#define __ARCH_WANT_SYSCALL_NO_FLAGS -#define __ARCH_WANT_SYSCALL_DEPRECATED - #include <asm/unistd.h> #include <asm/ioctls.h> #include <asm/errno.h> #include <linux/fs.h> #include <linux/loop.h> +#include <linux/time.h> #define NOLIBC @@ -152,24 +145,6 @@ struct pollfd { short int revents; }; -/* for select() */ -struct timeval { - long tv_sec; - long tv_usec; -}; - -/* for pselect() */ -struct timespec { - long tv_sec; - long tv_nsec; -}; - -/* for gettimeofday() */ -struct timezone { - int tz_minuteswest; - int tz_dsttime; -}; - /* for getdents64() */ struct linux_dirent64 { uint64_t d_ino; @@ -271,6 +246,8 @@ struct stat { #define WEXITSTATUS(status) (((status) & 0xff00) >> 8) #define WIFEXITED(status) (((status) & 0x7f) == 0) +/* for SIGCHLD */ +#include <asm/signal.h> /* Below comes the architecture-specific code. For each architecture, we have * the syscall declarations and the _start code definition. This is the only @@ -1469,8 +1446,10 @@ int sys_chmod(const char *path, mode_t mode) { #ifdef __NR_fchmodat return my_syscall4(__NR_fchmodat, AT_FDCWD, path, mode, 0); -#else +#elif defined(__NR_chmod) return my_syscall2(__NR_chmod, path, mode); +#else +#error Neither __NR_fchmodat nor __NR_chmod defined, cannot implement sys_chmod() #endif } @@ -1479,8 +1458,10 @@ int sys_chown(const char *path, uid_t owner, gid_t group) { #ifdef __NR_fchownat return my_syscall5(__NR_fchownat, AT_FDCWD, path, owner, group, 0); -#else +#elif defined(__NR_chown) return my_syscall3(__NR_chown, path, owner, group); +#else +#error Neither __NR_fchownat nor __NR_chown defined, cannot implement sys_chown() #endif } @@ -1502,10 +1483,24 @@ int sys_dup(int fd) return my_syscall1(__NR_dup, fd); } +#ifdef __NR_dup3 +static __attribute__((unused)) +int sys_dup3(int old, int new, int flags) +{ + return my_syscall3(__NR_dup3, old, new, flags); +} +#endif + static __attribute__((unused)) int sys_dup2(int old, int new) { +#ifdef __NR_dup3 + return my_syscall3(__NR_dup3, old, new, 0); +#elif defined(__NR_dup2) return my_syscall2(__NR_dup2, old, new); +#else +#error Neither __NR_dup3 nor __NR_dup2 defined, cannot implement sys_dup2() +#endif } static __attribute__((unused)) @@ -1517,7 +1512,17 @@ int sys_execve(const char *filename, char *const argv[], char *const envp[]) static __attribute__((unused)) pid_t sys_fork(void) { +#ifdef __NR_clone + /* note: some archs only have clone() and not fork(). Different archs + * have a different API, but most archs have the flags on first arg and + * will not use the rest with no other flag. + */ + return my_syscall5(__NR_clone, SIGCHLD, 0, 0, 0, 0); +#elif defined(__NR_fork) return my_syscall0(__NR_fork); +#else +#error Neither __NR_clone nor __NR_fork defined, cannot implement sys_fork() +#endif } static __attribute__((unused)) @@ -1533,9 +1538,15 @@ int sys_getdents64(int fd, struct linux_dirent64 *dirp, int count) } static __attribute__((unused)) +pid_t sys_getpgid(pid_t pid) +{ + return my_syscall1(__NR_getpgid, pid); +} + +static __attribute__((unused)) pid_t sys_getpgrp(void) { - return my_syscall0(__NR_getpgrp); + return sys_getpgid(0); } static __attribute__((unused)) @@ -1567,8 +1578,10 @@ int sys_link(const char *old, const char *new) { #ifdef __NR_linkat return my_syscall5(__NR_linkat, AT_FDCWD, old, AT_FDCWD, new, 0); -#else +#elif defined(__NR_link) return my_syscall2(__NR_link, old, new); +#else +#error Neither __NR_linkat nor __NR_link defined, cannot implement sys_link() #endif } @@ -1583,8 +1596,10 @@ int sys_mkdir(const char *path, mode_t mode) { #ifdef __NR_mkdirat return my_syscall3(__NR_mkdirat, AT_FDCWD, path, mode); -#else +#elif defined(__NR_mkdir) return my_syscall2(__NR_mkdir, path, mode); +#else +#error Neither __NR_mkdirat nor __NR_mkdir defined, cannot implement sys_mkdir() #endif } @@ -1593,8 +1608,10 @@ long sys_mknod(const char *path, mode_t mode, dev_t dev) { #ifdef __NR_mknodat return my_syscall4(__NR_mknodat, AT_FDCWD, path, mode, dev); -#else +#elif defined(__NR_mknod) return my_syscall3(__NR_mknod, path, mode, dev); +#else +#error Neither __NR_mknodat nor __NR_mknod defined, cannot implement sys_mknod() #endif } @@ -1610,8 +1627,10 @@ int sys_open(const char *path, int flags, mode_t mode) { #ifdef __NR_openat return my_syscall4(__NR_openat, AT_FDCWD, path, flags, mode); -#else +#elif defined(__NR_open) return my_syscall3(__NR_open, path, flags, mode); +#else +#error Neither __NR_openat nor __NR_open defined, cannot implement sys_open() #endif } @@ -1624,7 +1643,19 @@ int sys_pivot_root(const char *new, const char *old) static __attribute__((unused)) int sys_poll(struct pollfd *fds, int nfds, int timeout) { +#if defined(__NR_ppoll) + struct timespec t; + + if (timeout >= 0) { + t.tv_sec = timeout / 1000; + t.tv_nsec = (timeout % 1000) * 1000000; + } + return my_syscall4(__NR_ppoll, fds, nfds, (timeout >= 0) ? &t : NULL, NULL); +#elif defined(__NR_poll) return my_syscall3(__NR_poll, fds, nfds, timeout); +#else +#error Neither __NR_ppoll nor __NR_poll defined, cannot implement sys_poll() +#endif } static __attribute__((unused)) @@ -1663,11 +1694,13 @@ int sys_select(int nfds, fd_set *rfds, fd_set *wfds, fd_set *efds, struct timeva t.tv_nsec = timeout->tv_usec * 1000; } return my_syscall6(__NR_pselect6, nfds, rfds, wfds, efds, timeout ? &t : NULL, NULL); -#else +#elif defined(__NR__newselect) || defined(__NR_select) #ifndef __NR__newselect #define __NR__newselect __NR_select #endif return my_syscall5(__NR__newselect, nfds, rfds, wfds, efds, timeout); +#else +#error None of __NR_select, __NR_pselect6, nor __NR__newselect defined, cannot implement sys_select() #endif } @@ -1692,8 +1725,10 @@ int sys_stat(const char *path, struct stat *buf) #ifdef __NR_newfstatat /* only solution for arm64 */ ret = my_syscall4(__NR_newfstatat, AT_FDCWD, path, &stat, 0); -#else +#elif defined(__NR_stat) ret = my_syscall2(__NR_stat, path, &stat); +#else +#error Neither __NR_newfstatat nor __NR_stat defined, cannot implement sys_stat() #endif buf->st_dev = stat.st_dev; buf->st_ino = stat.st_ino; @@ -1717,8 +1752,10 @@ int sys_symlink(const char *old, const char *new) { #ifdef __NR_symlinkat return my_syscall3(__NR_symlinkat, old, AT_FDCWD, new); -#else +#elif defined(__NR_symlink) return my_syscall2(__NR_symlink, old, new); +#else +#error Neither __NR_symlinkat nor __NR_symlink defined, cannot implement sys_symlink() #endif } @@ -1739,8 +1776,10 @@ int sys_unlink(const char *path) { #ifdef __NR_unlinkat return my_syscall3(__NR_unlinkat, AT_FDCWD, path, 0); -#else +#elif defined(__NR_unlink) return my_syscall1(__NR_unlink, path); +#else +#error Neither __NR_unlinkat nor __NR_unlink defined, cannot implement sys_unlink() #endif } @@ -1853,6 +1892,18 @@ int close(int fd) } static __attribute__((unused)) +int dup(int fd) +{ + int ret = sys_dup(fd); + + if (ret < 0) { + SET_ERRNO(-ret); + ret = -1; + } + return ret; +} + +static __attribute__((unused)) int dup2(int old, int new) { int ret = sys_dup2(old, new); @@ -1864,6 +1915,20 @@ int dup2(int old, int new) return ret; } +#ifdef __NR_dup3 +static __attribute__((unused)) +int dup3(int old, int new, int flags) +{ + int ret = sys_dup3(old, new, flags); + + if (ret < 0) { + SET_ERRNO(-ret); + ret = -1; + } + return ret; +} +#endif + static __attribute__((unused)) int execve(const char *filename, char *const argv[], char *const envp[]) { @@ -1913,6 +1978,18 @@ int getdents64(int fd, struct linux_dirent64 *dirp, int count) } static __attribute__((unused)) +pid_t getpgid(pid_t pid) +{ + pid_t ret = sys_getpgid(pid); + + if (ret < 0) { + SET_ERRNO(-ret); + ret = -1; + } + return ret; +} + +static __attribute__((unused)) pid_t getpgrp(void) { pid_t ret = sys_getpgrp(); |