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3a2884df70
* Minor adjustments to make all compilable with the proper list of Android syscalls. git-svn-id: trunk@39739 -
53 lines
1.6 KiB
PHP
53 lines
1.6 KiB
PHP
{
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This file is part of the Free Pascal run time library.
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Copyright (c) 2005-2009 by Michael Van Canneyt and David Zhang
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See the file COPYING.FPC, included in this distribution,
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for details about the copyright.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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**********************************************************************}
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{$ifndef generic_linux_syscalls}
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{$define FPC_BASEUNIX_HAS_FPPIPE}
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Function fppipe(var fildes : tfildes):cint;assembler;
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{
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This function puts the registers in place, does the call, and then
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copies back the registers as they are after the SysCall.
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Extracted from linux/source/arch/mips/kernel/syscall.c:
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* For historic reasons the pipe(2) syscall on MIPS has an unusual calling
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* convention. It returns results in registers $v0 / $v1 which means there
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* is no need for it to do verify the validity of a userspace pointer
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* argument. Historically that used to be expensive in Linux. These days
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* the performance advantage is negligible.
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}
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var
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tmp: pointer;
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asm
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sw $a0,tmp { if $a0 is preserved in syscall then this is not needed }
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li $v0,syscall_nr_pipe
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syscall
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nop
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beq $a3,$0,.L1
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nop
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move $a0,$v0
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jal fpseterrno
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nop
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b .L2
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li $v0,-1 { in delay slot }
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.L1:
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{ the two files descriptors are now in v0 and v1 registers
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copying them back into fildes variable }
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lw $t1,tmp
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sw $v0,($t1)
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sw $v1,4($t1)
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.L2:
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end;
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{$endif generic_linux_syscalls}
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