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Diffstat (limited to 'libc')
-rw-r--r--libc/sysdeps/linux/aarch64/bits/syscalls.h51
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 3c0d840..489736f 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 */