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inline syscall support for arm

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most pure-syscall-wrapper functions compile to the smallest/simplest
code possible (save r7 ; load syscall # ; svc 0 ; restore r7 ; tail
call to __syscall_ret).
This commit is contained in:
Rich Felker
2012-09-09 01:29:19 -04:00
parent 328810d325
commit 5e3c243d8d
1 changed files with 53 additions and 0 deletions
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arch/arm/syscall_arch.h
+53
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@@ -5,6 +5,57 @@
#define __SYSCALL_SSLEN 8
#ifndef __clang__
#define __asm_syscall(...) do { \
__asm__ __volatile__ ( "svc 0" \
: "=r"(r0) : __VA_ARGS__ : "memory"); \
return r0; \
} while (0)
static inline long __syscall0(long n)
{
register long r7 __asm__("r7") = n;
register long r0 __asm__("r0");
__asm_syscall("r"(r7));
}
static inline long __syscall1(long n, long a)
{
register long r7 __asm__("r7") = n;
register long r0 __asm__("r0") = a;
__asm_syscall("r"(r7), "r"(r0));
}
static inline long __syscall2(long n, long a, long b)
{
register long r7 __asm__("r7") = n;
register long r0 __asm__("r0") = a;
register long r1 __asm__("r1") = b;
__asm_syscall("r"(r7), "r"(r0), "r"(r1));
}
static inline long __syscall3(long n, long a, long b, long c)
{
register long r7 __asm__("r7") = n;
register long r0 __asm__("r0") = a;
register long r1 __asm__("r1") = b;
register long r2 __asm__("r2") = c;
__asm_syscall("r"(r7), "r"(r0), "r"(r1), "r"(r2));
}
static inline long __syscall4(long n, long a, long b, long c, long d)
{
register long r7 __asm__("r7") = n;
register long r0 __asm__("r0") = a;
register long r1 __asm__("r1") = b;
register long r2 __asm__("r2") = c;
register long r3 __asm__("r3") = d;
__asm_syscall("r"(r7), "r"(r0), "r"(r1), "r"(r2), "r"(r3));
}
#else
static inline long __syscall0(long n)
{
return (__syscall)(n);
@@ -30,6 +81,8 @@ static inline long __syscall4(long n, long a, long b, long c, long d)
return (__syscall)(n, a, b, c, d);
}
#endif
static inline long __syscall5(long n, long a, long b, long c, long d, long e)
{
return (__syscall)(n, a, b, c, d, e);