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#ifndef _BITS_SYSCALLS_H
#define _BITS_SYSCALLS_H
#ifndef _SYSCALL_H
# error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead."
#endif
/*
Some of the sneaky macros in the code were taken from
glibc-2.3.2/sysdeps/unix/sysv/linux/arm/sysdep.h
*/
#ifdef __ASSEMBLER__
/* Call a given syscall, with arguments loaded. For EABI, we must
save and restore r7 for the syscall number. Unlike the DO_CALL
macro in glibc, this macro does not load syscall arguments. */
#undef DO_CALL
#if defined(__ARM_EABI__)
#define DO_CALL(syscall_name) \
mov ip, r7; \
ldr r7, =SYS_ify (syscall_name); \
swi 0x0; \
mov r7, ip;
#else
#define DO_CALL(syscall_name) \
swi SYS_ify (syscall_name);
#endif
#else
#include <errno.h>
#define INLINE_SYSCALL_NCS(name, nr, args...) \
(__extension__ \
({ \
unsigned int _inline_sys_result = INTERNAL_SYSCALL_NCS (name, , nr, args);\
if (unlikely (INTERNAL_SYSCALL_ERROR_P (_inline_sys_result, ))) \
{ \
__set_errno (INTERNAL_SYSCALL_ERRNO (_inline_sys_result, )); \
_inline_sys_result = (unsigned int) -1; \
} \
(int) _inline_sys_result; \
}) \
)
#if defined(__thumb__)
/* We can't use push/pop inside the asm because that breaks
unwinding (ie. thread cancellation).
*/
#define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
(__extension__ \
({ unsigned int __internal_sys_result; \
{ \
int _sys_buf[2]; \
register int __a1 __asm__ ("a1"); \
register int *_v3 __asm__ ("v3") = _sys_buf; \
*_v3 = (int) (name); \
LOAD_ARGS_##nr (args) \
__asm__ __volatile__ ("str r7, [v3, #4]\n" \
"\tldr r7, [v3]\n" \
"\tswi 0 @ syscall " #name "\n" \
"\tldr r7, [v3, #4]" \
: "=r" (__a1) \
: "r" (_v3) ASM_ARGS_##nr \
: "memory"); \
__internal_sys_result = __a1; \
} \
(int) __internal_sys_result; }) \
)
#else /* ARM */
#define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
(__extension__ \
({unsigned int __internal_sys_result; \
{ \
register int __a1 __asm__ ("r0"), _nr __asm__ ("r7"); \
LOAD_ARGS_##nr (args) \
_nr = (name); \
__asm__ __volatile__ ("swi 0x0 @ syscall " #name \
: "=r" (__a1) \
: "r" (_nr) ASM_ARGS_##nr \
: "memory"); \
__internal_sys_result = __a1; \
} \
(int) __internal_sys_result; }) \
)
#endif
#define INTERNAL_SYSCALL_ERROR_P(val, err) \
((unsigned int) (val) >= 0xfffff001u)
#define LOAD_ARGS_0()
#define ASM_ARGS_0
#define LOAD_ARGS_1(a1) \
int __a1tmp = (int) (a1); \
LOAD_ARGS_0 () \
__a1 = __a1tmp;
#define ASM_ARGS_1 ASM_ARGS_0, "r" (__a1)
#define LOAD_ARGS_2(a1, a2) \
int __a2tmp = (int) (a2); \
LOAD_ARGS_1 (a1) \
register int __a2 __asm__ ("a2") = __a2tmp;
#define ASM_ARGS_2 ASM_ARGS_1, "r" (__a2)
#define LOAD_ARGS_3(a1, a2, a3) \
int __a3tmp = (int) (a3); \
LOAD_ARGS_2 (a1, a2) \
register int __a3 __asm__ ("a3") = __a3tmp;
#define ASM_ARGS_3 ASM_ARGS_2, "r" (__a3)
#define LOAD_ARGS_4(a1, a2, a3, a4) \
int __a4tmp = (int) (a4); \
LOAD_ARGS_3 (a1, a2, a3) \
register int __a4 __asm__ ("a4") = __a4tmp;
#define ASM_ARGS_4 ASM_ARGS_3, "r" (__a4)
#define LOAD_ARGS_5(a1, a2, a3, a4, a5) \
int _v1tmp = (int) (a5); \
LOAD_ARGS_4 (a1, a2, a3, a4) \
register int _v1 __asm__ ("v1") = _v1tmp;
#define ASM_ARGS_5 ASM_ARGS_4, "r" (_v1)
#define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6) \
int _v2tmp = (int) (a6); \
LOAD_ARGS_5 (a1, a2, a3, a4, a5) \
register int _v2 __asm__ ("v2") = _v2tmp;
#define ASM_ARGS_6 ASM_ARGS_5, "r" (_v2)
#ifndef __thumb__
#define LOAD_ARGS_7(a1, a2, a3, a4, a5, a6, a7) \
int _v3tmp = (int) (a7); \
LOAD_ARGS_6 (a1, a2, a3, a4, a5, a6) \
register int _v3 __asm__ ("v3") = _v3tmp;
#define ASM_ARGS_7 ASM_ARGS_6, "r" (_v3)
#endif
#endif /* __ASSEMBLER__ */
#endif /* _BITS_SYSCALLS_H */
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