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

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• Hash : ab79d6e2
  Author :
  Date : 2013-11-21T06:12:35
  

  This separates the 32-bit sysv/linux/bsd code from the 64-bit linux code, and makes it possible to link code compiled with different options to those used to compile libffi. For example, a -mlong-double-128 libffi can be used with -mlong-double-64 code. Using the return value area as a place to pass parameters wasn't such a good idea, causing a failure of cls_ulonglong.c. I didn't see this when running the mainline gcc libffi testsuite because that version of the test is inferior to the upstreamm libffi test. Using NUM_FPR_ARG_REGISTERS rather than NUM_FPR_ARG_REGISTERS64 meant that a parameter save area could be allocated before it was strictly necessary. Wrong but harmless. Found when splitting apart ffi.c into 32-bit and 64-bit support.

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• src/powerpc/sysv.S

• /* -----------------------------------------------------------------------
     sysv.S - Copyright (c) 1998 Geoffrey Keating
     Copyright (C) 2007 Free Software Foundation, Inc
  
     PowerPC Assembly glue.
  
     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>
  #include <powerpc/asm.h>
  
  #ifndef POWERPC64
  	.globl ffi_prep_args_SYSV
  ENTRY(ffi_call_SYSV)
  .LFB1:
  	/* Save the old stack pointer as AP.  */
  	mr	%r8,%r1
  
  .LCFI0:
  	/* Allocate the stack space we need.  */
  	stwux	%r1,%r1,%r4
  	/* Save registers we use.  */
  	mflr	%r9
  	stw	%r28,-16(%r8)
  .LCFI1:
  	stw	%r29,-12(%r8)
  .LCFI2:
  	stw	%r30, -8(%r8)
  .LCFI3:
  	stw	%r31, -4(%r8)
  .LCFI4:
  	stw	%r9,   4(%r8)
  .LCFI5:
  
  	/* Save arguments over call...  */
  	mr	%r31,%r5	/* flags, */
  	mr	%r30,%r6	/* rvalue, */
  	mr	%r29,%r7	/* function address, */
  	mr	%r28,%r8	/* our AP. */
  .LCFI6:
  
  	/* Call ffi_prep_args_SYSV.  */
  	mr	%r4,%r1
  	bl	ffi_prep_args_SYSV@local
  
  	/* Now do the call.  */
  	/* Set up cr1 with bits 4-7 of the flags.  */
  	mtcrf	0x40,%r31
  	/* Get the address to call into CTR.  */
  	mtctr	%r29
  	/* Load all those argument registers.  */
  	lwz	%r3,-16-(8*4)(%r28)
  	lwz	%r4,-16-(7*4)(%r28)
  	lwz	%r5,-16-(6*4)(%r28)
  	lwz	%r6,-16-(5*4)(%r28)
  	bf-	5,1f
  	nop
  	lwz	%r7,-16-(4*4)(%r28)
  	lwz	%r8,-16-(3*4)(%r28)
  	lwz	%r9,-16-(2*4)(%r28)
  	lwz	%r10,-16-(1*4)(%r28)
  	nop
  1:
  
  #ifndef __NO_FPRS__
  	/* Load all the FP registers.  */
  	bf-	6,2f
  	lfd	%f1,-16-(8*4)-(8*8)(%r28)
  	lfd	%f2,-16-(8*4)-(7*8)(%r28)
  	lfd	%f3,-16-(8*4)-(6*8)(%r28)
  	lfd	%f4,-16-(8*4)-(5*8)(%r28)
  	nop
  	lfd	%f5,-16-(8*4)-(4*8)(%r28)
  	lfd	%f6,-16-(8*4)-(3*8)(%r28)
  	lfd	%f7,-16-(8*4)-(2*8)(%r28)
  	lfd	%f8,-16-(8*4)-(1*8)(%r28)
  #endif
  2:
  
  	/* Make the call.  */
  	bctrl
  
  	/* Now, deal with the return value.  */
  	mtcrf	0x01,%r31 /* cr7  */
  	bt-	31,L(small_struct_return_value)
  	bt-	30,L(done_return_value)
  #ifndef __NO_FPRS__
  	bt-	29,L(fp_return_value)
  #endif
  	stw	%r3,0(%r30)
  	bf+	28,L(done_return_value)
  	stw	%r4,4(%r30)
  	mtcrf	0x02,%r31 /* cr6  */
  	bf	27,L(done_return_value)
  	stw     %r5,8(%r30)
  	stw	%r6,12(%r30)
  	/* Fall through...  */
  
  L(done_return_value):
  	/* Restore the registers we used and return.  */
  	lwz	%r9,   4(%r28)
  	lwz	%r31, -4(%r28)
  	mtlr	%r9
  	lwz	%r30, -8(%r28)
  	lwz	%r29,-12(%r28)
  	lwz	%r28,-16(%r28)
  	lwz	%r1,0(%r1)
  	blr
  
  #ifndef __NO_FPRS__
  L(fp_return_value):
  	bf	28,L(float_return_value)
  	stfd	%f1,0(%r30)
  	mtcrf   0x02,%r31 /* cr6  */
  	bf	27,L(done_return_value)
  	stfd	%f2,8(%r30)
  	b	L(done_return_value)
  L(float_return_value):
  	stfs	%f1,0(%r30)
  	b	L(done_return_value)
  #endif
  
  L(small_struct_return_value):
  	/*
  	 * The C code always allocates a properly-aligned 8-byte bounce
  	 * buffer to make this assembly code very simple.  Just write out
  	 * r3 and r4 to the buffer to allow the C code to handle the rest.
  	 */
  	stw %r3, 0(%r30)
  	stw %r4, 4(%r30)
  	b L(done_return_value)
  
  .LFE1:
  END(ffi_call_SYSV)
  
        .section	".eh_frame",EH_FRAME_FLAGS,@progbits
  .Lframe1:
        .4byte    .LECIE1-.LSCIE1  /*  Length of Common Information Entry */
  .LSCIE1:
        .4byte    0x0      /*  CIE Identifier Tag */
        .byte     0x1      /*  CIE Version */
  #if defined _RELOCATABLE || defined __PIC__
        .ascii	"zR\0"   /*  CIE Augmentation */
  #else
        .ascii	"\0"	 /*  CIE Augmentation */
  #endif
        .uleb128  0x1      /*  CIE Code Alignment Factor */
        .sleb128  -4	 /*  CIE Data Alignment Factor */
        .byte     0x41     /*  CIE RA Column */
  #if defined _RELOCATABLE || defined __PIC__
        .uleb128  0x1      /*  Augmentation size */
        .byte	0x1b	 /*  FDE Encoding (pcrel sdata4) */
  #endif
        .byte     0xc      /*  DW_CFA_def_cfa */
        .uleb128  0x1
        .uleb128  0x0
        .align 2
  .LECIE1:
  .LSFDE1:
        .4byte    .LEFDE1-.LASFDE1         /*  FDE Length */
  .LASFDE1:
        .4byte    .LASFDE1-.Lframe1         /*  FDE CIE offset */
  #if defined _RELOCATABLE || defined __PIC__
        .4byte    .LFB1-.  /*  FDE initial location */
  #else
        .4byte    .LFB1    /*  FDE initial location */
  #endif
        .4byte    .LFE1-.LFB1      /*  FDE address range */
  #if defined _RELOCATABLE || defined __PIC__
        .uleb128  0x0	 /*  Augmentation size */
  #endif
        .byte     0x4      /*  DW_CFA_advance_loc4 */
        .4byte    .LCFI0-.LFB1
        .byte     0xd      /*  DW_CFA_def_cfa_register */
        .uleb128  0x08
        .byte     0x4      /*  DW_CFA_advance_loc4 */
        .4byte    .LCFI5-.LCFI0
        .byte     0x11     /*  DW_CFA_offset_extended_sf */
        .uleb128  0x41
        .sleb128  -1
        .byte     0x9f     /*  DW_CFA_offset, column 0x1f */
        .uleb128  0x1
        .byte     0x9e     /*  DW_CFA_offset, column 0x1e */
        .uleb128  0x2
        .byte     0x9d     /*  DW_CFA_offset, column 0x1d */
        .uleb128  0x3
        .byte     0x9c     /*  DW_CFA_offset, column 0x1c */
        .uleb128  0x4
        .byte     0x4      /*  DW_CFA_advance_loc4 */
        .4byte    .LCFI6-.LCFI5
        .byte     0xd      /*  DW_CFA_def_cfa_register */
        .uleb128  0x1c
        .align 2
  .LEFDE1:
  
  #if defined __ELF__ && defined __linux__
  	.section	.note.GNU-stack,"",@progbits
  #endif
  #endif
  

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