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21f0edbf9f
The _open() C function is declared as having variable arguments in newlib, so second and third arguments are passed on stack. Add code to move them into registers, since that's where the PRU simulator expects them. Issue was exposed by the GCC test gcc.c-torture/execute/fprintf-2.c, which relies on tmpnam implementation to pass correct flags to _open. Signed-off-by: Dimitar Dimitrov <dimitar@dinux.eu>
96 lines
2.8 KiB
ArmAsm
96 lines
2.8 KiB
ArmAsm
/* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* syscalls.S -- PRU system calls code
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*
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* Copyright (c) 2018-2019 Dimitar Dimitrov <dimitar@dinux.eu>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "newlib.h"
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#include "syscall.h"
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.extern _impure_ptr
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/* Handle return from syscall. */
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.section .text.__SC_ret, "ax"
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.global __SC_ret
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.type __SC_ret,@function
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.func
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__SC_ret:
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/* Check for negative return code */
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qbbc __SC_ret_skip_errno_set, r14, 31
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/* Invert return code and store to errno (first int in _impure_ptr). */
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rsb r14, r14, 0
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ldi32 r1, _impure_ptr
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lbbo r1, r1, 0, 4
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sbbo r14, r1, 0, 4
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/* Return -1 (for both int32_t or int64_t). */
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fill r14, 8
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__SC_ret_skip_errno_set:
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ret
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.endfunc
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.macro SC fname, id
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.section .text.\fname, "ax"
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.global \fname
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.type \fname,@function
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.func
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\fname:
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ldi r1, \id
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halt
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jmp __SC_ret
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.endfunc
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.endm
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/* Syscalls are used only by simulator. Real HW
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users use other methods for communicating with
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the host - remoteproc, rpmsg, shared memory. */
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SC _exit, SYS_exit
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SC _close, SYS_close
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SC _read, SYS_read
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SC _write, SYS_write
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SC _lseek, SYS_lseek
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SC _unlink, SYS_unlink
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SC _getpid, SYS_getpid
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SC _kill, SYS_kill
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SC _fstat, SYS_fstat
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/* _open is special because it has VA declaration. */
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.section .text._open, "ax"
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.global _open
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.type _open,@function
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.func
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_open:
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/* Pop the second and third argument from stack, per VA ABI.
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Thus simulator can get all arguments from registers
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for any supported syscall. */
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lbbo r16, sp, 4, 4
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lbbo r15, sp, 0, 4
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ldi r1, SYS_open
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halt
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jmp __SC_ret
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.endfunc
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