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inline syscall support for mips 

this drastically reduces the size of some functions which are purely
syscall wrappers.

disabled for clang due to known bugs satisfying register constraints.
This commit is contained in:
Rich Felker 2012-09-09 01:01:19 -04:00
parent be48e22b42
commit 328810d325
1 changed files with 57 additions and 0 deletions
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57
arch/mips/syscall_arch.h
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@ -5,6 +5,61 @@
#define __SYSCALL_SSLEN 16 #define __SYSCALL_SSLEN 16
#ifndef __clang__
#define __asm_syscall(...) do { \
register long r2 __asm__("$2"); \
register long r7 __asm__("$7"); \
__asm__ __volatile__ ( \
"move $2,%2 ; syscall" \
: "=&r"(r2), "=r"(r7) : __VA_ARGS__ \
: "$1", "$3", "$8", "$9", "$10", "$11", "$12", "$13", \
"$14", "$15", "$24", "hi", "lo", "memory"); \
return r7 ? -r2 : r2; \
} while (0)
static inline long __syscall0(long n)
{
register long r25 __asm__("$25") = n;
__asm_syscall("r"(r25));
}
static inline long __syscall1(long n, long a)
{
register long r25 __asm__("$25") = n;
register long r4 __asm__("$4") = a;
__asm_syscall("r"(r25), "r"(r4));
}
static inline long __syscall2(long n, long a, long b)
{
register long r25 __asm__("$25") = n;
register long r4 __asm__("$4") = a;
register long r5 __asm__("$5") = b;
__asm_syscall("r"(r25), "r"(r4), "r"(r5));
}
static inline long __syscall3(long n, long a, long b, long c)
{
register long r25 __asm__("$25") = n;
register long r4 __asm__("$4") = a;
register long r5 __asm__("$5") = b;
register long r6 __asm__("$6") = c;
__asm_syscall("r"(r25), "r"(r4), "r"(r5), "r"(r6));
}
static inline long __syscall4(long n, long a, long b, long c, long d)
{
register long r25 __asm__("$25") = n;
register long r4 __asm__("$4") = a;
register long r5 __asm__("$5") = b;
register long r6 __asm__("$6") = c;
register long r7 __asm__("$7") = d;
__asm_syscall("r"(r25), "r"(r4), "r"(r5), "r"(r6), "r"(r7));
}
#else
static inline long __syscall0(long n) static inline long __syscall0(long n)
{ {
return (__syscall)(n); return (__syscall)(n);
@ -30,6 +85,8 @@ static inline long __syscall4(long n, long a, long b, long c, long d)
return (__syscall)(n, a, b, c, 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) static inline long __syscall5(long n, long a, long b, long c, long d, long e)
{ {
return (__syscall)(n, a, b, c, d, e); return (__syscall)(n, a, b, c, d, e);