diff options
Diffstat (limited to 'libc')
| -rw-r--r-- | libc/sysdeps/linux/aarch64/bits/syscalls.h | 51 |
1 files changed, 44 insertions, 7 deletions
diff --git a/libc/sysdeps/linux/aarch64/bits/syscalls.h b/libc/sysdeps/linux/aarch64/bits/syscalls.h index 3c0d840ea..489736fe6 100644 --- a/libc/sysdeps/linux/aarch64/bits/syscalls.h +++ b/libc/sysdeps/linux/aarch64/bits/syscalls.h @@ -31,22 +31,55 @@ License along with the GNU C Library; if not, see #ifndef __ASSEMBLER__ #include <errno.h> -#define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \ +/* For Linux we can use the system call table in the header file + * /usr/include/asm/unistd.h + * of the kernel. But these symbols do not follow the SYS_* syntax + * so we have to redefine the `SYS_ify' macro here. */ +#undef SYS_ify +#define SYS_ify(syscall_name) (__NR_##syscall_name) + +/* Define a macro which expands into the inline wrapper code for a system + call. */ +# undef INLINE_SYSCALL +# define INLINE_SYSCALL(name, nr, args...) \ + ({ unsigned long _sys_result = INTERNAL_SYSCALL (name, , nr, args); \ + if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_sys_result, ), 0))\ + { \ + __set_errno (INTERNAL_SYSCALL_ERRNO (_sys_result, )); \ + _sys_result = (unsigned long) -1; \ + } \ + (long) _sys_result; }) + +# undef INTERNAL_SYSCALL_DECL +# define INTERNAL_SYSCALL_DECL(err) do { } while (0) + +#define INTERNAL_SYSCALL_RAW(name, err, nr, args...) \ ({ long _sys_result; \ { \ - register long _x8 __asm__ ("x8"); \ LOAD_ARGS_##nr (args) \ - _x8 = (name); \ - \ + register long _x8 __asm__ ("x8") = (name); \ __asm__ volatile ( \ "svc 0 // syscall " # name \ - : "=r" (_x0) : "r"(_x8) ASM_ARGS_##nr \ - : "memory"); \ - \ + : "=r" (_x0) : "r"(_x8) ASM_ARGS_##nr : "memory"); \ _sys_result = _x0; \ } \ _sys_result; }) +# undef INTERNAL_SYSCALL +# define INTERNAL_SYSCALL(name, err, nr, args...) \ + INTERNAL_SYSCALL_RAW(SYS_ify(name), err, nr, args) + +# undef INTERNAL_SYSCALL_AARCH64 +# define INTERNAL_SYSCALL_AARCH64(name, err, nr, args...) \ + INTERNAL_SYSCALL_RAW(__ARM_NR_##name, err, nr, args) + +# undef INTERNAL_SYSCALL_ERROR_P +# define INTERNAL_SYSCALL_ERROR_P(val, err) \ + ((unsigned long) (val) >= (unsigned long) -4095) + +# undef INTERNAL_SYSCALL_ERRNO +# define INTERNAL_SYSCALL_ERRNO(val, err) (-(val)) + /* Macros for setting up inline __asm__ input regs */ # define ASM_ARGS_0 # define ASM_ARGS_1 , "r" (_x0) @@ -102,5 +135,9 @@ License along with the GNU C Library; if not, see _x6tmp = (long) (x6); \ _x6 = _x6tmp; +# undef INTERNAL_SYSCALL_NCS +# define INTERNAL_SYSCALL_NCS(number, err, nr, args...) \ + INTERNAL_SYSCALL_RAW (number, err, nr, args) + #endif /* ! __ASSEMBLER__ */ #endif /* _BITS_SYSCALLS_H */ |