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Diffstat (limited to 'libc/sysdeps/linux/m68k/bits')
-rw-r--r--libc/sysdeps/linux/m68k/bits/syscalls.h224
1 files changed, 68 insertions, 156 deletions
diff --git a/libc/sysdeps/linux/m68k/bits/syscalls.h b/libc/sysdeps/linux/m68k/bits/syscalls.h
index d1ade8036..2c56613e4 100644
--- a/libc/sysdeps/linux/m68k/bits/syscalls.h
+++ b/libc/sysdeps/linux/m68k/bits/syscalls.h
@@ -13,8 +13,6 @@
#ifndef __ASSEMBLER__
-#include <errno.h>
-
/* Linux takes system call arguments in registers:
syscall number %d0 call-clobbered
@@ -23,9 +21,11 @@
arg 3 %d3 call-saved
arg 4 %d4 call-saved
arg 5 %d5 call-saved
+ arg 6 %a0 call-clobbered
The stack layout upon entering the function is:
+ 24(%sp) Arg# 6
20(%sp) Arg# 5
16(%sp) Arg# 4
12(%sp) Arg# 3
@@ -40,160 +40,72 @@
speed is more important, we don't use movem. Since %a0 and %a1 are
scratch registers, we can use them for saving as well. */
-#define __syscall_return(type, res) \
-do { \
- if ((unsigned long)(res) >= (unsigned long)(-125)) { \
- /* avoid using res which is declared to be in register d0; \
- errno might expand to a function call and clobber it. */ \
- int __err = -(res); \
- __set_errno(__err); \
- res = -1; \
- } \
- return (type) (res); \
-} while (0)
-
-#define _syscall0(type, name) \
-type name(void) \
-{ \
- long __res; \
- __asm__ __volatile__ ( \
- "movel %1, %%d0\n\t" \
- "trap #0\n\t" \
- "movel %%d0, %0" \
- : "=g" (__res) \
- : "i" (__NR_##name) \
- : "memory", "cc", "%d0"); \
- __syscall_return(type, __res); \
-}
-
-#define _syscall1(type, name, atype, a) \
-type name(atype a) \
-{ \
- long __res; \
- __asm__ __volatile__ ( \
- "movel %2, %%d1\n\t" \
- "movel %1, %%d0\n\t" \
- "trap #0\n\t" \
- "movel %%d0, %0" \
- : "=g" (__res) \
- : "i" (__NR_##name), \
- "g" ((long)a) \
- : "memory", "cc", "%d0", "%d1"); \
- __syscall_return(type, __res); \
-}
-
-#define _syscall2(type, name, atype, a, btype, b) \
-type name(atype a, btype b) \
-{ \
- long __res; \
- __asm__ __volatile__ ( \
- "movel %3, %%d2\n\t" \
- "movel %2, %%d1\n\t" \
- "movel %1, %%d0\n\t" \
- "trap #0\n\t" \
- "movel %%d0, %0" \
- : "=g" (__res) \
- : "i" (__NR_##name), \
- "a" ((long)a), \
- "g" ((long)b) \
- : "memory", "cc", "%d0", "%d1", "%d2"); \
- __syscall_return(type, __res); \
-}
-
-#define _syscall3(type, name, atype, a, btype, b, ctype, c) \
-type name(atype a, btype b, ctype c) \
-{ \
- long __res; \
- __asm__ __volatile__ ( \
- "movel %4, %%d3\n\t" \
- "movel %3, %%d2\n\t" \
- "movel %2, %%d1\n\t" \
- "movel %1, %%d0\n\t" \
- "trap #0\n\t" \
- "movel %%d0, %0" \
- : "=g" (__res) \
- : "i" (__NR_##name), \
- "a" ((long)a), \
- "a" ((long)b), \
- "g" ((long)c) \
- : "memory", "cc", "%d0", "%d1", "%d2", "%d3"); \
- __syscall_return(type, __res); \
-}
-
-#define _syscall4(type, name, atype, a, btype, b, ctype, c, dtype, d) \
-type name(atype a, btype b, ctype c, dtype d) \
-{ \
- long __res; \
- __asm__ __volatile__ ( \
- "movel %5, %%d4\n\t" \
- "movel %4, %%d3\n\t" \
- "movel %3, %%d2\n\t" \
- "movel %2, %%d1\n\t" \
- "movel %1, %%d0\n\t" \
- "trap #0\n\t" \
- "movel %%d0, %0" \
- : "=g" (__res) \
- : "i" (__NR_##name), \
- "a" ((long)a), \
- "a" ((long)b), \
- "a" ((long)c), \
- "g" ((long)d) \
- : "memory", "cc", "%d0", "%d1", "%d2", "%d3", \
- "%d4"); \
- __syscall_return(type, __res); \
-}
-
-#define _syscall5(type, name, atype, a, btype, b, ctype, c, dtype, d, etype, e) \
-type name(atype a, btype b, ctype c, dtype d, etype e) \
-{ \
- long __res; \
- __asm__ __volatile__ ( \
- "movel %6, %%d5\n\t" \
- "movel %5, %%d4\n\t" \
- "movel %4, %%d3\n\t" \
- "movel %3, %%d2\n\t" \
- "movel %2, %%d1\n\t" \
- "movel %1, %%d0\n\t" \
- "trap #0\n\t" \
- "movel %%d0, %0" \
- : "=g" (__res) \
- : "i" (__NR_##name), \
- "a" ((long)a), \
- "a" ((long)b), \
- "a" ((long)c), \
- "a" ((long)d), \
- "g" ((long)e) \
- : "memory", "cc", "%d0", "%d1", "%d2", "%d3", \
- "%d4", "%d5"); \
- __syscall_return(type, __res); \
-}
-
-#define _syscall6(type, name, atype, a, btype, b, ctype, c, dtype, d, etype, e, ftype, f) \
-type name(atype a, btype b, ctype c, dtype d, etype e, ftype f) \
-{ \
- long __res; \
- __asm__ __volatile__ ( \
- "movel %7, %%a0\n\t" \
- "movel %6, %%d5\n\t" \
- "movel %5, %%d4\n\t" \
- "movel %4, %%d3\n\t" \
- "movel %3, %%d2\n\t" \
- "movel %2, %%d1\n\t" \
- "movel %1, %%d0\n\t" \
- "trap #0\n\t" \
- "movel %%d0, %0" \
- : "=g" (__res) \
- : "i" (__NR_##name), \
- "a" ((long)a), \
- "a" ((long)b), \
- "a" ((long)c), \
- "a" ((long)d), \
- "g" ((long)e), \
- "g" ((long)f) \
- : "memory", "cc", "%d0", "%d1", "%d2", "%d3", \
- "%d4", "%d5", "%a0"); \
- __syscall_return(type, __res); \
-}
+/* Define a macro which expands inline into the wrapper code for a system
+ call. This use is for internal calls that do not need to handle errors
+ normally. It will never touch errno. This returns just what the kernel
+ gave back. */
+#define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
+ ({ unsigned int _sys_result; \
+ { \
+ /* Load argument values in temporary variables
+ to perform side effects like function calls
+ before the call used registers are set. */ \
+ LOAD_ARGS_##nr (args) \
+ LOAD_REGS_##nr \
+ register int _d0 __asm__ ("%d0") = name; \
+ __asm__ __volatile__ ("trap #0" \
+ : "=d" (_d0) \
+ : "0" (_d0) ASM_ARGS_##nr \
+ : "memory"); \
+ _sys_result = _d0; \
+ } \
+ (int) _sys_result; })
+
+#define LOAD_ARGS_0()
+#define LOAD_REGS_0
+#define ASM_ARGS_0
+#define LOAD_ARGS_1(a1) \
+ LOAD_ARGS_0 () \
+ int __arg1 = (int) (a1);
+#define LOAD_REGS_1 \
+ register int _d1 __asm__ ("d1") = __arg1; \
+ LOAD_REGS_0
+#define ASM_ARGS_1 ASM_ARGS_0, "d" (_d1)
+#define LOAD_ARGS_2(a1, a2) \
+ LOAD_ARGS_1 (a1) \
+ int __arg2 = (int) (a2);
+#define LOAD_REGS_2 \
+ register int _d2 __asm__ ("d2") = __arg2; \
+ LOAD_REGS_1
+#define ASM_ARGS_2 ASM_ARGS_1, "d" (_d2)
+#define LOAD_ARGS_3(a1, a2, a3) \
+ LOAD_ARGS_2 (a1, a2) \
+ int __arg3 = (int) (a3);
+#define LOAD_REGS_3 \
+ register int _d3 __asm__ ("d3") = __arg3; \
+ LOAD_REGS_2
+#define ASM_ARGS_3 ASM_ARGS_2, "d" (_d3)
+#define LOAD_ARGS_4(a1, a2, a3, a4) \
+ LOAD_ARGS_3 (a1, a2, a3) \
+ int __arg4 = (int) (a4);
+#define LOAD_REGS_4 \
+ register int _d4 __asm__ ("d4") = __arg4; \
+ LOAD_REGS_3
+#define ASM_ARGS_4 ASM_ARGS_3, "d" (_d4)
+#define LOAD_ARGS_5(a1, a2, a3, a4, a5) \
+ LOAD_ARGS_4 (a1, a2, a3, a4) \
+ int __arg5 = (int) (a5);
+#define LOAD_REGS_5 \
+ register int _d5 __asm__ ("d5") = __arg5; \
+ LOAD_REGS_4
+#define ASM_ARGS_5 ASM_ARGS_4, "d" (_d5)
+#define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6) \
+ LOAD_ARGS_5 (a1, a2, a3, a4, a5) \
+ int __arg6 = (int) (a6);
+#define LOAD_REGS_6 \
+ register int _a0 __asm__ ("a0") = __arg6; \
+ LOAD_REGS_5
+#define ASM_ARGS_6 ASM_ARGS_5, "a" (_a0)
#endif /* __ASSEMBLER__ */
#endif /* _BITS_SYSCALLS_H */
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