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jeremybenn |
/* -----------------------------------------------------------------------
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sysv.S - Copyright (c) 1998 Geoffrey Keating
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Copyright (C) 2007 Free Software Foundation, Inc
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PowerPC Assembly glue.
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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
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#include
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#include
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#ifndef __powerpc64__
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.globl ffi_prep_args_SYSV
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ENTRY(ffi_call_SYSV)
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.LFB1:
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/* Save the old stack pointer as AP. */
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mr %r8,%r1
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.LCFI0:
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/* Allocate the stack space we need. */
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stwux %r1,%r1,%r4
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/* Save registers we use. */
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mflr %r9
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stw %r28,-16(%r8)
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.LCFI1:
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stw %r29,-12(%r8)
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.LCFI2:
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stw %r30, -8(%r8)
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.LCFI3:
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stw %r31, -4(%r8)
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.LCFI4:
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stw %r9, 4(%r8)
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.LCFI5:
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/* Save arguments over call... */
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mr %r31,%r5 /* flags, */
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mr %r30,%r6 /* rvalue, */
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mr %r29,%r7 /* function address, */
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mr %r28,%r8 /* our AP. */
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.LCFI6:
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/* Call ffi_prep_args_SYSV. */
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mr %r4,%r1
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bl ffi_prep_args_SYSV@local
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/* Now do the call. */
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/* Set up cr1 with bits 4-7 of the flags. */
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mtcrf 0x40,%r31
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/* Get the address to call into CTR. */
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mtctr %r29
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/* Load all those argument registers. */
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lwz %r3,-16-(8*4)(%r28)
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lwz %r4,-16-(7*4)(%r28)
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lwz %r5,-16-(6*4)(%r28)
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lwz %r6,-16-(5*4)(%r28)
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bf- 5,1f
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nop
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lwz %r7,-16-(4*4)(%r28)
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lwz %r8,-16-(3*4)(%r28)
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lwz %r9,-16-(2*4)(%r28)
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lwz %r10,-16-(1*4)(%r28)
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nop
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1:
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/* Load all the FP registers. */
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bf- 6,2f
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lfd %f1,-16-(8*4)-(8*8)(%r28)
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lfd %f2,-16-(8*4)-(7*8)(%r28)
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lfd %f3,-16-(8*4)-(6*8)(%r28)
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lfd %f4,-16-(8*4)-(5*8)(%r28)
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nop
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lfd %f5,-16-(8*4)-(4*8)(%r28)
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lfd %f6,-16-(8*4)-(3*8)(%r28)
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lfd %f7,-16-(8*4)-(2*8)(%r28)
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lfd %f8,-16-(8*4)-(1*8)(%r28)
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2:
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/* Make the call. */
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bctrl
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/* Now, deal with the return value. */
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mtcrf 0x01,%r31 /* cr7 */
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bt- 31,L(small_struct_return_value)
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bt- 30,L(done_return_value)
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bt- 29,L(fp_return_value)
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stw %r3,0(%r30)
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bf+ 28,L(done_return_value)
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stw %r4,4(%r30)
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mtcrf 0x02,%r31 /* cr6 */
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bf 27,L(done_return_value)
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stw %r5,8(%r30)
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stw %r6,12(%r30)
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/* Fall through... */
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L(done_return_value):
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/* Restore the registers we used and return. */
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lwz %r9, 4(%r28)
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lwz %r31, -4(%r28)
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mtlr %r9
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lwz %r30, -8(%r28)
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lwz %r29,-12(%r28)
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lwz %r28,-16(%r28)
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lwz %r1,0(%r1)
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blr
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L(fp_return_value):
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bf 28,L(float_return_value)
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stfd %f1,0(%r30)
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mtcrf 0x02,%r31 /* cr6 */
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bf 27,L(done_return_value)
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stfd %f2,8(%r30)
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b L(done_return_value)
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L(float_return_value):
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stfs %f1,0(%r30)
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b L(done_return_value)
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L(small_struct_return_value):
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extrwi %r6,%r31,2,19 /* number of bytes padding = shift/8 */
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mtcrf 0x02,%r31 /* copy flags to cr[24:27] (cr6) */
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extrwi %r5,%r31,5,19 /* r5 <- number of bits of padding */
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subfic %r6,%r6,4 /* r6 <- number of useful bytes in r3 */
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bf- 25,L(done_return_value) /* struct in r3 ? if not, done. */
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/* smst_one_register: */
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slw %r3,%r3,%r5 /* Left-justify value in r3 */
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mtxer %r6 /* move byte count to XER ... */
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stswx %r3,0,%r30 /* ... and store that many bytes */
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bf+ 26,L(done_return_value) /* struct in r3:r4 ? */
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add %r6,%r6,%r30 /* adjust pointer */
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stswi %r4,%r6,4 /* store last four bytes */
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b L(done_return_value)
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.LFE1:
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END(ffi_call_SYSV)
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.section ".eh_frame",EH_FRAME_FLAGS,@progbits
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.Lframe1:
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.4byte .LECIE1-.LSCIE1 /* Length of Common Information Entry */
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.LSCIE1:
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.4byte 0x0 /* CIE Identifier Tag */
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.byte 0x1 /* CIE Version */
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#if defined _RELOCATABLE || defined __PIC__
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.ascii "zR\0" /* CIE Augmentation */
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#else
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.ascii "\0" /* CIE Augmentation */
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#endif
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.uleb128 0x1 /* CIE Code Alignment Factor */
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.sleb128 -4 /* CIE Data Alignment Factor */
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.byte 0x41 /* CIE RA Column */
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#if defined _RELOCATABLE || defined __PIC__
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.uleb128 0x1 /* Augmentation size */
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.byte 0x1b /* FDE Encoding (pcrel sdata4) */
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#endif
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.byte 0xc /* DW_CFA_def_cfa */
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.uleb128 0x1
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.uleb128 0x0
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.align 2
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.LECIE1:
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.LSFDE1:
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.4byte .LEFDE1-.LASFDE1 /* FDE Length */
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.LASFDE1:
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.4byte .LASFDE1-.Lframe1 /* FDE CIE offset */
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#if defined _RELOCATABLE || defined __PIC__
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.4byte .LFB1-. /* FDE initial location */
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#else
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.4byte .LFB1 /* FDE initial location */
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#endif
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.4byte .LFE1-.LFB1 /* FDE address range */
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#if defined _RELOCATABLE || defined __PIC__
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.uleb128 0x0 /* Augmentation size */
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#endif
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.byte 0x4 /* DW_CFA_advance_loc4 */
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.4byte .LCFI0-.LFB1
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.byte 0xd /* DW_CFA_def_cfa_register */
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.uleb128 0x08
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.byte 0x4 /* DW_CFA_advance_loc4 */
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.4byte .LCFI5-.LCFI0
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.byte 0x11 /* DW_CFA_offset_extended_sf */
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.uleb128 0x41
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.sleb128 -1
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.byte 0x9f /* DW_CFA_offset, column 0x1f */
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.uleb128 0x1
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.byte 0x9e /* DW_CFA_offset, column 0x1e */
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.uleb128 0x2
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.byte 0x9d /* DW_CFA_offset, column 0x1d */
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.uleb128 0x3
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.byte 0x9c /* DW_CFA_offset, column 0x1c */
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.uleb128 0x4
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.byte 0x4 /* DW_CFA_advance_loc4 */
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.4byte .LCFI6-.LCFI5
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.byte 0xd /* DW_CFA_def_cfa_register */
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.uleb128 0x1c
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.align 2
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.LEFDE1:
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#endif
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#if defined __ELF__ && defined __linux__
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.section .note.GNU-stack,"",@progbits
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#endif
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