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@@ -13,8 +13,6 @@
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#ifndef __ASSEMBLER__
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-#include <errno.h>
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-
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/* Linux takes system call arguments in registers:
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syscall number %d0 call-clobbered
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@@ -23,9 +21,11 @@
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arg 3 %d3 call-saved
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arg 4 %d4 call-saved
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arg 5 %d5 call-saved
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+ arg 6 %a0 call-clobbered
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The stack layout upon entering the function is:
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+ 24(%sp) Arg# 6
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20(%sp) Arg# 5
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16(%sp) Arg# 4
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12(%sp) Arg# 3
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@@ -40,160 +40,72 @@
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speed is more important, we don't use movem. Since %a0 and %a1 are
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scratch registers, we can use them for saving as well. */
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-#define __syscall_return(type, res) \
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-do { \
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- if ((unsigned long)(res) >= (unsigned long)(-125)) { \
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- /* avoid using res which is declared to be in register d0; \
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- errno might expand to a function call and clobber it. */ \
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- int __err = -(res); \
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- __set_errno(__err); \
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- res = -1; \
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- } \
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- return (type) (res); \
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-} while (0)
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-
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-#define _syscall0(type, name) \
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-type name(void) \
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-{ \
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- long __res; \
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- __asm__ __volatile__ ( \
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- "movel %1, %%d0\n\t" \
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- "trap #0\n\t" \
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- "movel %%d0, %0" \
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- : "=g" (__res) \
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- : "i" (__NR_##name) \
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- : "memory", "cc", "%d0"); \
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- __syscall_return(type, __res); \
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-}
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-
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-#define _syscall1(type, name, atype, a) \
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-type name(atype a) \
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-{ \
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- long __res; \
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- __asm__ __volatile__ ( \
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- "movel %2, %%d1\n\t" \
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- "movel %1, %%d0\n\t" \
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- "trap #0\n\t" \
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- "movel %%d0, %0" \
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- : "=g" (__res) \
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- : "i" (__NR_##name), \
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- "g" ((long)a) \
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- : "memory", "cc", "%d0", "%d1"); \
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- __syscall_return(type, __res); \
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-}
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-
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-#define _syscall2(type, name, atype, a, btype, b) \
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-type name(atype a, btype b) \
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-{ \
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- long __res; \
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- __asm__ __volatile__ ( \
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- "movel %3, %%d2\n\t" \
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- "movel %2, %%d1\n\t" \
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- "movel %1, %%d0\n\t" \
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- "trap #0\n\t" \
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- "movel %%d0, %0" \
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- : "=g" (__res) \
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- : "i" (__NR_##name), \
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- "a" ((long)a), \
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- "g" ((long)b) \
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- : "memory", "cc", "%d0", "%d1", "%d2"); \
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- __syscall_return(type, __res); \
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-}
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-
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-#define _syscall3(type, name, atype, a, btype, b, ctype, c) \
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-type name(atype a, btype b, ctype c) \
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-{ \
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- long __res; \
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- __asm__ __volatile__ ( \
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- "movel %4, %%d3\n\t" \
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- "movel %3, %%d2\n\t" \
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- "movel %2, %%d1\n\t" \
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- "movel %1, %%d0\n\t" \
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- "trap #0\n\t" \
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- "movel %%d0, %0" \
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- : "=g" (__res) \
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- : "i" (__NR_##name), \
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- "a" ((long)a), \
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- "a" ((long)b), \
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- "g" ((long)c) \
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- : "memory", "cc", "%d0", "%d1", "%d2", "%d3"); \
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- __syscall_return(type, __res); \
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-}
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-
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-#define _syscall4(type, name, atype, a, btype, b, ctype, c, dtype, d) \
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-type name(atype a, btype b, ctype c, dtype d) \
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-{ \
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- long __res; \
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- __asm__ __volatile__ ( \
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- "movel %5, %%d4\n\t" \
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- "movel %4, %%d3\n\t" \
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- "movel %3, %%d2\n\t" \
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- "movel %2, %%d1\n\t" \
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- "movel %1, %%d0\n\t" \
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- "trap #0\n\t" \
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- "movel %%d0, %0" \
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- : "=g" (__res) \
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- : "i" (__NR_##name), \
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- "a" ((long)a), \
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- "a" ((long)b), \
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- "a" ((long)c), \
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- "g" ((long)d) \
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- : "memory", "cc", "%d0", "%d1", "%d2", "%d3", \
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- "%d4"); \
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- __syscall_return(type, __res); \
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-}
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-
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-#define _syscall5(type, name, atype, a, btype, b, ctype, c, dtype, d, etype, e) \
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-type name(atype a, btype b, ctype c, dtype d, etype e) \
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-{ \
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- long __res; \
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- __asm__ __volatile__ ( \
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- "movel %6, %%d5\n\t" \
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- "movel %5, %%d4\n\t" \
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- "movel %4, %%d3\n\t" \
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- "movel %3, %%d2\n\t" \
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- "movel %2, %%d1\n\t" \
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- "movel %1, %%d0\n\t" \
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- "trap #0\n\t" \
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- "movel %%d0, %0" \
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- : "=g" (__res) \
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- : "i" (__NR_##name), \
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- "a" ((long)a), \
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- "a" ((long)b), \
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- "a" ((long)c), \
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- "a" ((long)d), \
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- "g" ((long)e) \
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- : "memory", "cc", "%d0", "%d1", "%d2", "%d3", \
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- "%d4", "%d5"); \
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- __syscall_return(type, __res); \
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-}
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-
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-#define _syscall6(type, name, atype, a, btype, b, ctype, c, dtype, d, etype, e, ftype, f) \
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-type name(atype a, btype b, ctype c, dtype d, etype e, ftype f) \
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-{ \
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- long __res; \
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- __asm__ __volatile__ ( \
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- "movel %7, %%a0\n\t" \
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- "movel %6, %%d5\n\t" \
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- "movel %5, %%d4\n\t" \
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- "movel %4, %%d3\n\t" \
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- "movel %3, %%d2\n\t" \
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- "movel %2, %%d1\n\t" \
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- "movel %1, %%d0\n\t" \
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- "trap #0\n\t" \
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- "movel %%d0, %0" \
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- : "=g" (__res) \
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- : "i" (__NR_##name), \
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- "a" ((long)a), \
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- "a" ((long)b), \
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- "a" ((long)c), \
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- "a" ((long)d), \
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- "g" ((long)e), \
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- "g" ((long)f) \
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- : "memory", "cc", "%d0", "%d1", "%d2", "%d3", \
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- "%d4", "%d5", "%a0"); \
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- __syscall_return(type, __res); \
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-}
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+/* Define a macro which expands inline into the wrapper code for a system
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+ call. This use is for internal calls that do not need to handle errors
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+ normally. It will never touch errno. This returns just what the kernel
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+ gave back. */
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+#define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
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+ ({ unsigned int _sys_result; \
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+ { \
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+ /* Load argument values in temporary variables
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+ to perform side effects like function calls
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+ before the call used registers are set. */ \
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+ LOAD_ARGS_##nr (args) \
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+ LOAD_REGS_##nr \
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+ register int _d0 __asm__ ("%d0") = name; \
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+ __asm__ __volatile__ ("trap #0" \
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+ : "=d" (_d0) \
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+ : "0" (_d0) ASM_ARGS_##nr \
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+ : "memory"); \
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+ _sys_result = _d0; \
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+ } \
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+ (int) _sys_result; })
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+
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+#define LOAD_ARGS_0()
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+#define LOAD_REGS_0
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+#define ASM_ARGS_0
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+#define LOAD_ARGS_1(a1) \
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+ LOAD_ARGS_0 () \
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+ int __arg1 = (int) (a1);
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+#define LOAD_REGS_1 \
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+ register int _d1 __asm__ ("d1") = __arg1; \
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+ LOAD_REGS_0
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+#define ASM_ARGS_1 ASM_ARGS_0, "d" (_d1)
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+#define LOAD_ARGS_2(a1, a2) \
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+ LOAD_ARGS_1 (a1) \
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+ int __arg2 = (int) (a2);
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+#define LOAD_REGS_2 \
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+ register int _d2 __asm__ ("d2") = __arg2; \
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+ LOAD_REGS_1
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+#define ASM_ARGS_2 ASM_ARGS_1, "d" (_d2)
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+#define LOAD_ARGS_3(a1, a2, a3) \
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+ LOAD_ARGS_2 (a1, a2) \
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+ int __arg3 = (int) (a3);
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+#define LOAD_REGS_3 \
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+ register int _d3 __asm__ ("d3") = __arg3; \
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+ LOAD_REGS_2
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+#define ASM_ARGS_3 ASM_ARGS_2, "d" (_d3)
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+#define LOAD_ARGS_4(a1, a2, a3, a4) \
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+ LOAD_ARGS_3 (a1, a2, a3) \
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+ int __arg4 = (int) (a4);
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+#define LOAD_REGS_4 \
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+ register int _d4 __asm__ ("d4") = __arg4; \
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+ LOAD_REGS_3
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+#define ASM_ARGS_4 ASM_ARGS_3, "d" (_d4)
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+#define LOAD_ARGS_5(a1, a2, a3, a4, a5) \
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+ LOAD_ARGS_4 (a1, a2, a3, a4) \
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+ int __arg5 = (int) (a5);
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+#define LOAD_REGS_5 \
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+ register int _d5 __asm__ ("d5") = __arg5; \
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+ LOAD_REGS_4
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+#define ASM_ARGS_5 ASM_ARGS_4, "d" (_d5)
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+#define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6) \
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+ LOAD_ARGS_5 (a1, a2, a3, a4, a5) \
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+ int __arg6 = (int) (a6);
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+#define LOAD_REGS_6 \
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+ register int _a0 __asm__ ("a0") = __arg6; \
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+ LOAD_REGS_5
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+#define ASM_ARGS_6 ASM_ARGS_5, "a" (_a0)
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#endif /* __ASSEMBLER__ */
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#endif /* _BITS_SYSCALLS_H */
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