diff options
Diffstat (limited to 'libc/sysdeps')
| -rw-r--r-- | libc/sysdeps/linux/m68k/bits/syscalls.h | 176 |
1 files changed, 169 insertions, 7 deletions
diff --git a/libc/sysdeps/linux/m68k/bits/syscalls.h b/libc/sysdeps/linux/m68k/bits/syscalls.h index 62541b873..c833cf777 100644 --- a/libc/sysdeps/linux/m68k/bits/syscalls.h +++ b/libc/sysdeps/linux/m68k/bits/syscalls.h @@ -4,16 +4,178 @@ # error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead." #endif -#include <features.h> - -/* Do something very evil for now. Until we create our own syscall - * macros, short circuit bits/sysnum.h and use asm/unistd.h instead */ -#include <asm/unistd.h> - /* This includes the `__NR_<name>' syscall numbers taken from the Linux kernel * header files. It also defines the traditional `SYS_<name>' macros for older * programs. */ #include <bits/sysnum.h> -#endif /* _BITS_SYSCALLS_H */ +#ifndef __set_errno +# define __set_errno(val) (*__errno_location ()) = (val) +#endif + +/* + Some of the sneaky macros in the code were taken from + glibc-2.2.5/sysdeps/unix/sysv/linux/m68k/sysdep.h +*/ + +#ifndef __ASSEMBLER__ + +#undef _syscall0 +#define _syscall0(type,name) \ +type name(void) \ +{ \ +return (type) (INLINE_SYSCALL(name, 0)); \ +} + +#undef _syscall1 +#define _syscall1(type,name,type1,arg1) \ +type name(type1 arg1) \ +{ \ +return (type) (INLINE_SYSCALL(name, 1, arg1)); \ +} + +#undef _syscall2 +#define _syscall2(type,name,type1,arg1,type2,arg2) \ +type name(type1 arg1,type2 arg2) \ +{ \ +return (type) (INLINE_SYSCALL(name, 2, arg1, arg2)); \ +} + +#undef _syscall3 +#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3) \ +type name(type1 arg1,type2 arg2,type3 arg3) \ +{ \ +return (type) (INLINE_SYSCALL(name, 3, arg1, arg2, arg3)); \ +} + +#undef _syscall4 +#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4) \ +type name (type1 arg1, type2 arg2, type3 arg3, type4 arg4) \ +{ \ +return (type) (INLINE_SYSCALL(name, 4, arg1, arg2, arg3, arg4)); \ +} + +#undef _syscall5 +#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \ + type5,arg5) \ +type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5) \ +{ \ +return (type) (INLINE_SYSCALL(name, 5, arg1, arg2, arg3, arg4, arg5)); \ +} + +#undef _syscall6 +#define _syscall6(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4, \ + type5,arg5,type6,arg6) \ +type name (type1 arg1,type2 arg2,type3 arg3,type4 arg4,type5 arg5,type6 arg6) \ +{ \ +return (type) (INLINE_SYSCALL(name, 6, arg1, arg2, arg3, arg4, arg5, arg6)); \ +} +/* 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 + + The stack layout upon entering the function is: + + 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. */ + +#undef INLINE_SYSCALL +#define INLINE_SYSCALL(name, nr, args...) \ + ({ unsigned int _sys_result = INTERNAL_SYSCALL (name, , nr, args); \ + if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (_sys_result, ), 0))\ + { \ + __set_errno (INTERNAL_SYSCALL_ERRNO (_sys_result, )); \ + _sys_result = (unsigned int) -1; \ + } \ + (int) _sys_result; }) + +#undef INTERNAL_SYSCALL +#define INTERNAL_SYSCALL(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") = __NR_##name; \ + asm volatile ("trap #0" \ + : "=d" (_d0) \ + : "0" (_d0) ASM_ARGS_##nr \ + : "memory"); \ + _sys_result = _d0; \ + } \ + (int) _sys_result; }) + +#undef INTERNAL_SYSCALL_ERROR_P +#define INTERNAL_SYSCALL_ERROR_P(val, err) \ + ((unsigned int) (val) >= -4095U) + +#undef INTERNAL_SYSCALL_ERRNO +#define INTERNAL_SYSCALL_ERRNO(val, err) (-(val)) + +#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 */ |