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- /* System call interface code for Sequent Symmetry running Dynix version 3.
- Copyright (C) 1993 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, write to the Free Software Foundation, Inc., 675 Mass Ave,
- Cambridge, MA 02139, USA. */
-
- #include <sysdeps/unix/i386/sysdep.h>
-
- /* Get the symbols for system call interrupts. */
- #include <machine/trap.h>
-
- /* Use the BSD versions of system calls, by setting the high 16 bits
- of the syscall number (see /usr/include/syscall.h). */
- #define SYS_HANDLER (SYS_bsd << 16)
-
- /* Dynix uses an interrupt interface to system calls.
- "int $T_SVCn" are syscall interfaces for 0-6 arg functions.
- (see /usr/include/machine/trap.h). */
-
- #undef DO_CALL
-
- #ifdef __STDC__
- #define DO_CALL(syscall_name, args) \
- movl $(SYS_HANDLER | SYS_##syscall_name), %eax; \
- int $T_SVC##args;
- #else
- #define DO_CALL(syscall_name, args) \
- movl $(SYS_HANDLER | SYS_/**/syscall_name), %eax; \
- int $T_SVC/**/args;
- #endif
-
- #undef PSEUDO
- #define PSEUDO(name, syscall_name, args) \
- .text; \
- .globl syscall_error; \
- .align 4; \
- ENTRY (name) \
- ARGS (args) \
- DO_CALL (syscall_name, args) \
- jb syscall_error
-
- /* For one and two-argument calls, Dynix takes the arguments in %ecx and
- %edx. For 3-6 argument calls, Dynix takes the address of the first
- argument in %ecx. */
-
- #ifdef __STDC__
- #define ARGS(n) ARGS_##n
- #else
- #define ARGS(n) ARGS_/**/n
- #endif
-
- #define ARGS_0
- #define ARGS_1 movl 4(%esp), %ecx;
- #define ARGS_2 movl 4(%esp), %ecx; movl 8(%esp), %edx;
- #define ARGS_3 leal 4(%esp), %ecx;
- #define ARGS_4 ARGS_3
- #define ARGS_5 ARGS_3
- #define ARGS_6 ARGS_3
-
- /* Dynix reverses %ecx and %edx relative to most i386 Unices. */
-
- #undef r1
- #define r1 %ecx /* Secondary return-value register. */
- #undef scratch
- #define scratch %edx /* Call-clobbered register for random use. */
-