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- #ifndef _BITS_SYSCALLS_H
- #define _BITS_SYSCALLS_H
- #ifndef _SYSCALL_H
- # error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead."
- #endif
- /* m68k headers does stupid stuff with __NR_iopl / __NR_vm86:
- * #define __NR_iopl not supported
- * #define __NR_vm86 not supported
- */
- #undef __NR_iopl
- #undef __NR_vm86
- #ifndef __ASSEMBLER__
- /* Linux takes system call arguments in registers:
- syscall number %d0 call-clobbered
- arg 1 %d1 call-clobbered
- arg 2 %d2 call-saved
- 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
- 8(%sp) Arg# 2
- 4(%sp) Arg# 1
- (%sp) Return address
- (Of course a function with say 3 arguments does not have entries for
- arguments 4 and 5.)
- Separate move's are faster than movem, but need more space. Since
- 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 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...) \
- (__extension__ \
- ({ 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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