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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
/* m68k headers does stupid stuff with __NR_iopl / __NR_vm86:
* #define __NR_iopl not supported
* #define __NR_vm86 not supported
*/
#undef __NR_iopl
#undef __NR_vm86
#ifndef __ASSEMBLER__
#include <errno.h>
/* Linux takes system call arguments in registers:
syscall number %d0 call-clobbered
arg 1 %d1 call-clobbered
arg 2 %d2 call-saved
arg 3 %d3 call-saved
arg 4 %d4 call-saved
arg 5 %d5 call-saved
The stack layout upon entering the function is:
20(%sp) Arg# 5
16(%sp) Arg# 4
12(%sp) Arg# 3
8(%sp) Arg# 2
4(%sp) Arg# 1
(%sp) Return address
(Of course a function with say 3 arguments does not have entries for
arguments 4 and 5.)
Separate move's are faster than movem, but need more space. Since
speed is more important, we don't use movem. Since %a0 and %a1 are
scratch registers, we can use them for saving as well. */
#define __syscall_return(type, res) \
do { \
if ((unsigned long)(res) >= (unsigned long)(-125)) { \
/* avoid using res which is declared to be in register d0; \
errno might expand to a function call and clobber it. */ \
int __err = -(res); \
__set_errno(__err); \
res = -1; \
} \
return (type) (res); \
} while (0)
#define _syscall0(type, name) \
type name(void) \
{ \
long __res; \
__asm__ __volatile__ ( \
"movel %1, %%d0\n\t" \
"trap #0\n\t" \
"movel %%d0, %0" \
: "=g" (__res) \
: "i" (__NR_##name) \
: "memory", "cc", "%d0"); \
__syscall_return(type, __res); \
}
#define _syscall1(type, name, atype, a) \
type name(atype a) \
{ \
long __res; \
__asm__ __volatile__ ( \
"movel %2, %%d1\n\t" \
"movel %1, %%d0\n\t" \
"trap #0\n\t" \
"movel %%d0, %0" \
: "=g" (__res) \
: "i" (__NR_##name), \
"g" ((long)a) \
: "memory", "cc", "%d0", "%d1"); \
__syscall_return(type, __res); \
}
#define _syscall2(type, name, atype, a, btype, b) \
type name(atype a, btype b) \
{ \
long __res; \
__asm__ __volatile__ ( \
"movel %3, %%d2\n\t" \
"movel %2, %%d1\n\t" \
"movel %1, %%d0\n\t" \
"trap #0\n\t" \
"movel %%d0, %0" \
: "=g" (__res) \
: "i" (__NR_##name), \
"a" ((long)a), \
"g" ((long)b) \
: "memory", "cc", "%d0", "%d1", "%d2"); \
__syscall_return(type, __res); \
}
#define _syscall3(type, name, atype, a, btype, b, ctype, c) \
type name(atype a, btype b, ctype c) \
{ \
long __res; \
__asm__ __volatile__ ( \
"movel %4, %%d3\n\t" \
"movel %3, %%d2\n\t" \
"movel %2, %%d1\n\t" \
"movel %1, %%d0\n\t" \
"trap #0\n\t" \
"movel %%d0, %0" \
: "=g" (__res) \
: "i" (__NR_##name), \
"a" ((long)a), \
"a" ((long)b), \
"g" ((long)c) \
: "memory", "cc", "%d0", "%d1", "%d2", "%d3"); \
__syscall_return(type, __res); \
}
#define _syscall4(type, name, atype, a, btype, b, ctype, c, dtype, d) \
type name(atype a, btype b, ctype c, dtype d) \
{ \
long __res; \
__asm__ __volatile__ ( \
"movel %5, %%d4\n\t" \
"movel %4, %%d3\n\t" \
"movel %3, %%d2\n\t" \
"movel %2, %%d1\n\t" \
"movel %1, %%d0\n\t" \
"trap #0\n\t" \
"movel %%d0, %0" \
: "=g" (__res) \
: "i" (__NR_##name), \
"a" ((long)a), \
"a" ((long)b), \
"a" ((long)c), \
"g" ((long)d) \
: "memory", "cc", "%d0", "%d1", "%d2", "%d3", \
"%d4"); \
__syscall_return(type, __res); \
}
#define _syscall5(type, name, atype, a, btype, b, ctype, c, dtype, d, etype, e) \
type name(atype a, btype b, ctype c, dtype d, etype e) \
{ \
long __res; \
__asm__ __volatile__ ( \
"movel %6, %%d5\n\t" \
"movel %5, %%d4\n\t" \
"movel %4, %%d3\n\t" \
"movel %3, %%d2\n\t" \
"movel %2, %%d1\n\t" \
"movel %1, %%d0\n\t" \
"trap #0\n\t" \
"movel %%d0, %0" \
: "=g" (__res) \
: "i" (__NR_##name), \
"a" ((long)a), \
"a" ((long)b), \
"a" ((long)c), \
"a" ((long)d), \
"g" ((long)e) \
: "memory", "cc", "%d0", "%d1", "%d2", "%d3", \
"%d4", "%d5"); \
__syscall_return(type, __res); \
}
#define _syscall6(type, name, atype, a, btype, b, ctype, c, dtype, d, etype, e, ftype, f) \
type name(atype a, btype b, ctype c, dtype d, etype e, ftype f) \
{ \
long __res; \
__asm__ __volatile__ ( \
"movel %7, %%a0\n\t" \
"movel %6, %%d5\n\t" \
"movel %5, %%d4\n\t" \
"movel %4, %%d3\n\t" \
"movel %3, %%d2\n\t" \
"movel %2, %%d1\n\t" \
"movel %1, %%d0\n\t" \
"trap #0\n\t" \
"movel %%d0, %0" \
: "=g" (__res) \
: "i" (__NR_##name), \
"a" ((long)a), \
"a" ((long)b), \
"a" ((long)c), \
"a" ((long)d), \
"g" ((long)e), \
"g" ((long)f) \
: "memory", "cc", "%d0", "%d1", "%d2", "%d3", \
"%d4", "%d5", "%a0"); \
__syscall_return(type, __res); \
}
#endif /* __ASSEMBLER__ */
#endif /* _BITS_SYSCALLS_H */
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