/* -----------------------------------------------------------------------
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sysv.S - Copyright (c) 2014 Sebastian Macke <sebastian@macke.de>
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OpenRISC Foreign Function Interface
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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``Software''), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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----------------------------------------------------------------------- */
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#define LIBFFI_ASM
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#include <fficonfig.h>
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#include <ffi.h>
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.text
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.globl ffi_call_SYSV
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.type ffi_call_SYSV, @function
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/*
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r3: size to allocate on stack
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r4: extended cif structure
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r5: function pointer ffi_prep_args
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r6: ret address
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r7: function to call
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r8: flag for return type
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*/
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ffi_call_SYSV:
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/* Store registers used on stack */
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l.sw -4(r1), r9 /* return address */
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l.sw -8(r1), r1 /* stack address */
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l.sw -12(r1), r14 /* callee saved registers */
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l.sw -16(r1), r16
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l.sw -20(r1), r18
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l.sw -24(r1), r20
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l.ori r14, r1, 0x0 /* save stack pointer */
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l.addi r1, r1, -24
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l.ori r16, r7, 0x0 /* save function address */
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l.ori r18, r6, 0x0 /* save ret address */
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l.ori r20, r8, 0x0 /* save flag */
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l.sub r1, r1, r3 /* reserve space on stack */
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/* Call ffi_prep_args */
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l.ori r3, r1, 0x0 /* first argument stack address, second already ecif */
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l.jalr r5
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l.nop
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/* Load register arguments and call*/
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l.lwz r3, 0(r1)
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l.lwz r4, 4(r1)
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l.lwz r5, 8(r1)
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l.lwz r6, 12(r1)
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l.lwz r7, 16(r1)
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l.lwz r8, 20(r1)
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l.ori r1, r11, 0x0 /* new stack pointer */
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l.jalr r16
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l.nop
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/* handle return values */
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l.sfeqi r20, FFI_TYPE_STRUCT
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l.bf ret /* structs don't return an rvalue */
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l.nop
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/* copy ret address */
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l.sfeqi r20, FFI_TYPE_UINT64
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l.bnf four_byte_ret /* 8 byte value is returned */
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l.nop
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l.sw 4(r18), r12
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four_byte_ret:
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l.sw 0(r18), r11
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ret:
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/* return */
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l.ori r1, r14, 0x0 /* reset stack pointer */
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l.lwz r9, -4(r1)
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l.lwz r1, -8(r1)
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l.lwz r14, -12(r1)
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l.lwz r16, -16(r1)
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l.lwz r18, -20(r1)
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l.lwz r20, -24(r1)
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l.jr r9
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l.nop
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.size ffi_call_SYSV, .-ffi_call_SYSV
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