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syscall overhaul part two - unify public and internal syscall interface

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with this patch, the syscallN() functions are no longer needed; a
variadic syscall() macro allows syscalls with anywhere from 0 to 6
arguments to be made with a single macro name. also, manually casting
each non-integer argument with (long) is no longer necessary; the
casts are hidden in the macros.

some source files which depended on being able to define the old macro
SYSCALL_RETURNS_ERRNO have been modified to directly use __syscall()
instead of syscall(). references to SYSCALL_SIGSET_SIZE and SYSCALL_LL
have also been changed.

x86_64 has not been tested, and may need a follow-up commit to fix any
minor bugs/oversights.
This commit is contained in:
Rich Felker 2011-03-19 21:36:10 -04:00
commit 685e40bb09
26 changed files with 275 additions and 316 deletions
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64
arch/x86_64/bits/syscall.h
View file

@ -1,3 +1,67 @@
#define __SYSCALL_LL(x) (x)
static inline long __syscall0(long __n)
{
unsigned long __ret;
__asm__ __volatile__ ("syscall" : "=a"(__ret) : "a"(__n) : "rcx", "r11", "memory");
return __ret;
}
static inline long __syscall1(long __n, long __a1)
{
unsigned long __ret;
__asm__ __volatile__ ("syscall" : "=a"(__ret) : "a"(__n), "D"(__a1) : "rcx", "r11", "memory");
return __ret;
}
static inline long __syscall2(long __n, long __a1, long __a2)
{
unsigned long __ret;
__asm__ __volatile__ ("syscall" : "=a"(__ret) : "a"(__n), "D"(__a1), "S"(__a2)
: "rcx", "r11", "memory");
return __ret;
}
static inline long __syscall3(long __n, long __a1, long __a2, long __a3)
{
unsigned long __ret;
__asm__ __volatile__ ("syscall" : "=a"(__ret) : "a"(__n), "D"(__a1), "S"(__a2),
"d"(__a3) : "rcx", "r11", "memory");
return __ret;
}
static inline long __syscall4(long __n, long __a1, long __a2, long __a3, long __a4)
{
unsigned long __ret;
register long __r10 __asm__("r10") = __a4;
__asm__ __volatile__ ("syscall" : "=a"(__ret) : "a"(__n), "D"(__a1), "S"(__a2),
"d"(__a3), "r"(__r10): "rcx", "r11", "memory");
return __ret;
}
static inline long __syscall5(long __n, long __a1, long __a2, long __a3, long __a4, long __a5)
{
unsigned long __ret;
register long __r10 __asm__("r10") = __a4;
register long__ r8 __asm__("r8") = __a5;
__asm__ __volatile__ ("syscall" : "=a"(__ret) : "a"(__n), "D"(__a1), "S"(__a2),
"d"(__a3), "r"(__r10), "r"(__r8) : "rcx", "r11", "memory");
return __ret;
}
static inline long __syscall6(long __n, long __a1, long __a2, long __a3, long __a4, long __a5, long __a6)
{
unsigned long __ret;
register long __r10 __asm__("r10") = __a4;
register long __r8 __asm__("r8") = __a5;
register long __r9 __asm__("r9") = __a6;
__asm__ __volatile__ ("syscall" : "=a"(__ret) : "a"(__n), "D"(__a1), "S"(__a2),
"d"(__a3), "r"(__r10), "r"(__r8), "r"(__r9) : "rcx", "r11", "memory");
return __ret;
}
#define __socketcall(nm, a, b, c, d, e, f) syscall(__NR_##nm, a, b, c, d, e, f)
#define __NR_read 0
#define __NR_write 1
#define __NR_open 2