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113 lines
2.2 KiB
ArmAsm
113 lines
2.2 KiB
ArmAsm
/* ==== syscall.S ============================================================
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* Copyright (c) 1994 Chris Provenzano, proven@mit.edu
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* All rights reserved.
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*
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*/
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#ifndef lint
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.text
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.asciz "$Id$";
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#endif
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#include <sys/syscall.h>
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#define SYSCALL(x) \
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.globl _machdep_sys_##x; \
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\
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_machdep_sys_##x:; \
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\
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mov SYS_##x, %g1; \
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ta 0; \
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bcs,a 2b; \
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sub %r0,%o0,%o0; \
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retl
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/*
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* Initial asm stuff for all functions.
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*/
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.text
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.align 4
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/* ==========================================================================
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* error code for all syscalls. The error value is returned as the negative
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* of the errno value.
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*/
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1:
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sub %r0, %o0, %o0
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2:
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retl
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nop
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/* ==========================================================================
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* machdep_sys_pipe()
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*/
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.globl _machdep_sys_pipe
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_machdep_sys_pipe:
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mov %o0, %o2
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mov SYS_pipe, %g1
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ta 0
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bcs 1b
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nop
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st %o0, [ %o2 ]
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st %o1, [ %o2 + 4 ]
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retl
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mov %g0, %o0
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/* ==========================================================================
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* machdep_sys_fork()
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*/
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.globl _machdep_sys_fork;
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_machdep_sys_fork:;
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mov SYS_fork, %g1;
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ta 0;
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bcs 1b;
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nop;
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tst %o1
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bne,a __fork_parent
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mov %g0, %o0
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__fork_parent:;
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retl
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/* POSIX-compliant getpgrp() takes no arguments. The SunOS syscall wants
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one, and gives the POSIXy result if that argument is zero. */
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.globl _getpgrp
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_getpgrp:
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mov SYS_getpgrp, %g1
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mov 0, %i0
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ta 0
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bcs 1b
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nop
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retl
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nop
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#if 0
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/* I think this bit of magic will do the right thing for other syscalls.
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We get here with the new `errno' code in %o0. It should get stored in
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*__error(), and -1 returned to the caller. */
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.globl cerror
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cerror:
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save %sp,-104,%sp
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/* Now value is in %i0. Store it in *__error(). */
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call ___error
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nop
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st %i0,[%o0]
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/* Now also store a copy in global variable errno, for routines
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like isatty that want to examine it and which haven't been
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converted yet. */
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sethi %hi(_errno), %o0
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st %i0,[%o0+%lo(_errno)]
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#if 0 /* use this if you want -errno returned */
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sub %r0,%i0,%i0
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#else /* return -1 */
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mov -1,%i0
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#endif
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retl
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restore
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#endif
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