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authorRich Felker <dalias@aerifal.cx>2012-09-09 01:01:19 -0400
committerRich Felker <dalias@aerifal.cx>2012-09-09 01:01:19 -0400
commit328810d32524e4928fec50b57e37e1bf330b2e40 (patch)
tree1db4efb8d84abde9da0e52cb0327abf4ff27a33d
parentbe48e22b424b6f858da0151a0b3b68bdb96b41ca (diff)
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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.
-rw-r--r--arch/mips/syscall_arch.h57
1 files changed, 57 insertions, 0 deletions
diff --git a/arch/mips/syscall_arch.h b/arch/mips/syscall_arch.h
index 68e8dce3..f3df2dcd 100644
--- a/arch/mips/syscall_arch.h
+++ b/arch/mips/syscall_arch.h
@@ -5,6 +5,61 @@
#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)
{
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);
}
+#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);