diff options
Diffstat (limited to 'pk/syscall.c')
-rw-r--r-- | pk/syscall.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/pk/syscall.c b/pk/syscall.c new file mode 100644 index 0000000..85c853b --- /dev/null +++ b/pk/syscall.c @@ -0,0 +1,124 @@ +#include <machine/syscall.h> +#include <string.h> +#include <errno.h> +#include "pk.h" +#include "pcr.h" +#include "file.h" +#include "frontend.h" + +typedef sysret_t (*syscall_t)(long,long,long,long,long); + +void sys_exit(int code) +{ + frontend_syscall(SYS_exit,code,0,0,0); + panic("exit didn't exit!"); +} + +sysret_t sys_read(int fd, char* buf, size_t n) +{ + sysret_t r = {-1,EBADF}; + file_t* f = file_get(fd); + if(!f) + return r; + + return file_read(f,buf,n); +} + +sysret_t sys_write(int fd, const char* buf, size_t n) +{ + sysret_t r = {-1,EBADF}; + file_t* f = file_get(fd); + if(!f) + return r; + + return file_write(f,buf,n); +} + +sysret_t sys_open(const char* name, size_t len, int flags, int mode) +{ + sysret_t ret = file_open(name, len, flags, mode); + if(ret.result == -1) + return ret; + + if((ret.result = file_dup((file_t*)ret.result)) == -1) + ret.err = ENOMEM; + + return ret; +} + +sysret_t sys_close(int fd) +{ + return (sysret_t){fd_close(fd),EBADF}; +} + +sysret_t sys_fstat(int fd, void* st) +{ + sysret_t r = {-1,EBADF}; + file_t* f = file_get(fd); + if(!f) + return r; + + return file_stat(f,st); +} + +sysret_t sys_lseek(int fd, size_t ptr, int dir) +{ + sysret_t r = {-1,EBADF}; + file_t* f = file_get(fd); + if(!f) + return r; + + return file_lseek(f,ptr,dir); +} + +sysret_t sys_stat(const char* name, size_t len, void* st) +{ + return frontend_syscall(SYS_stat,(long)name,len,(long)st,0); +} + +sysret_t sys_lstat(const char* name, size_t len, void* st) +{ + return frontend_syscall(SYS_lstat,(long)name,len,(long)st,0); +} + +sysret_t sys_link(const char* old_name, size_t old_len, + const char* new_name, size_t new_len) +{ + return frontend_syscall(SYS_link,(long)old_name,old_len, + (long)new_name,new_len); +} + +sysret_t sys_unlink(const char* name, size_t len) +{ + return frontend_syscall(SYS_unlink,(long)name,len,0,0); +} + +sysret_t sys_brk(size_t pos) +{ + if(pos > (mfpcr(PCR_MEMSIZE) << MEMSIZE_SHIFT)) + return (sysret_t){-1, ENOMEM}; + return (sysret_t){0,0}; +} + +sysret_t syscall(long a0, long a1, long a2, long a3, long n) +{ + const static void* syscall_table[] = { + [SYS_exit] = sys_exit, + [SYS_read] = sys_read, + [SYS_write] = sys_write, + [SYS_open] = sys_open, + [SYS_close] = sys_close, + [SYS_fstat] = sys_fstat, + [SYS_lseek] = sys_lseek, + [SYS_stat] = sys_stat, + [SYS_lstat] = sys_lstat, + [SYS_link] = sys_link, + [SYS_unlink] = sys_unlink, + [SYS_brk] = sys_brk, + }; + + if(n >= ARRAY_SIZE(syscall_table) || !syscall_table[n]) + panic("bad syscall #%ld!",n); + + return ((syscall_t)syscall_table[n])(a0, a1, a2, a3, n); +} |