c3-lang/libffi/src/or1k/sysv.S

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• Hash : 0f316ab7
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  Date : 2014-09-27T00:19:15
  

  Add OpenRISC support This patch adds support for the OpenRISC architecture. (http://opencores.org/or1k/Main_Page) This patch has been tested under Linux with QEMU-user emulation support. - 32 Bit - big endian - delayed instructions This is the only available configuration under Linux. The description of the ABI can be found on the official website. Is passes the testsuite except of the unwindtest_ffi_call.cc testcase, which seems to be a problem of gcc and not libffi. Some testcases of the gcc testsuite still fail. Signed-off-by: Sebastian Macke <sebastian@macke.de>

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• src/or1k/sysv.S

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

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