| /* ----------------------------------------------------------------------- |
| 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: |
| |
| /* 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) |
| 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) |
| bt- 29,L(fp_return_value) |
| 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 |
| |
| 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) |
| |
| L(small_struct_return_value): |
| extrwi %r6,%r31,2,19 /* number of bytes padding = shift/8 */ |
| mtcrf 0x02,%r31 /* copy flags to cr[24:27] (cr6) */ |
| extrwi %r5,%r31,5,19 /* r5 <- number of bits of padding */ |
| subfic %r6,%r6,4 /* r6 <- number of useful bytes in r3 */ |
| bf- 25,L(done_return_value) /* struct in r3 ? if not, done. */ |
| /* smst_one_register: */ |
| slw %r3,%r3,%r5 /* Left-justify value in r3 */ |
| mtxer %r6 /* move byte count to XER ... */ |
| stswx %r3,0,%r30 /* ... and store that many bytes */ |
| bf+ 26,L(done_return_value) /* struct in r3:r4 ? */ |
| add %r6,%r6,%r30 /* adjust pointer */ |
| stswi %r4,%r6,4 /* store last four bytes */ |
| 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: |
| #endif |
| |
| #if defined __ELF__ && defined __linux__ |
| .section .note.GNU-stack,"",@progbits |
| #endif |
