1 /* ----------------------------------------------------------------------- 2 sysv.S - Copyright (c) 1998 Geoffrey Keating 3 Copyright (C) 2007 Free Software Foundation, Inc 4 5 PowerPC Assembly glue. 6 7 Permission is hereby granted, free of charge, to any person obtaining 8 a copy of this software and associated documentation files (the 9 ``Software''), to deal in the Software without restriction, including 10 without limitation the rights to use, copy, modify, merge, publish, 11 distribute, sublicense, and/or sell copies of the Software, and to 12 permit persons to whom the Software is furnished to do so, subject to 13 the following conditions: 14 15 The above copyright notice and this permission notice shall be included 16 in all copies or substantial portions of the Software. 17 18 THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, 19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 21 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 22 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 23 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 24 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 25 DEALINGS IN THE SOFTWARE. 26 ----------------------------------------------------------------------- */ 27 28 #define LIBFFI_ASM 29 #include <fficonfig.h> 30 #include <ffi.h> 31 #include <powerpc/asm.h> 32 33 #ifndef POWERPC64 34 .globl ffi_prep_args_SYSV 35 ENTRY(ffi_call_SYSV) 36 .LFB1: 37 /* Save the old stack pointer as AP. */ 38 mr %r8,%r1 39 40 .LCFI0: 41 /* Allocate the stack space we need. */ 42 stwux %r1,%r1,%r4 43 /* Save registers we use. */ 44 mflr %r9 45 stw %r28,-16(%r8) 46 .LCFI1: 47 stw %r29,-12(%r8) 48 .LCFI2: 49 stw %r30, -8(%r8) 50 .LCFI3: 51 stw %r31, -4(%r8) 52 .LCFI4: 53 stw %r9, 4(%r8) 54 .LCFI5: 55 56 /* Save arguments over call... */ 57 mr %r31,%r5 /* flags, */ 58 mr %r30,%r6 /* rvalue, */ 59 mr %r29,%r7 /* function address, */ 60 mr %r28,%r8 /* our AP. */ 61 .LCFI6: 62 63 /* Call ffi_prep_args_SYSV. */ 64 mr %r4,%r1 65 bl ffi_prep_args_SYSV@local 66 67 /* Now do the call. */ 68 /* Set up cr1 with bits 4-7 of the flags. */ 69 mtcrf 0x40,%r31 70 /* Get the address to call into CTR. */ 71 mtctr %r29 72 /* Load all those argument registers. */ 73 lwz %r3,-16-(8*4)(%r28) 74 lwz %r4,-16-(7*4)(%r28) 75 lwz %r5,-16-(6*4)(%r28) 76 lwz %r6,-16-(5*4)(%r28) 77 bf- 5,1f 78 nop 79 lwz %r7,-16-(4*4)(%r28) 80 lwz %r8,-16-(3*4)(%r28) 81 lwz %r9,-16-(2*4)(%r28) 82 lwz %r10,-16-(1*4)(%r28) 83 nop 84 1: 85 86 #ifndef __NO_FPRS__ 87 /* Load all the FP registers. */ 88 bf- 6,2f 89 lfd %f1,-16-(8*4)-(8*8)(%r28) 90 lfd %f2,-16-(8*4)-(7*8)(%r28) 91 lfd %f3,-16-(8*4)-(6*8)(%r28) 92 lfd %f4,-16-(8*4)-(5*8)(%r28) 93 nop 94 lfd %f5,-16-(8*4)-(4*8)(%r28) 95 lfd %f6,-16-(8*4)-(3*8)(%r28) 96 lfd %f7,-16-(8*4)-(2*8)(%r28) 97 lfd %f8,-16-(8*4)-(1*8)(%r28) 98 #endif 99 2: 100 101 /* Make the call. */ 102 bctrl 103 104 /* Now, deal with the return value. */ 105 mtcrf 0x01,%r31 /* cr7 */ 106 bt- 31,L(small_struct_return_value) 107 bt- 30,L(done_return_value) 108 #ifndef __NO_FPRS__ 109 bt- 29,L(fp_return_value) 110 #endif 111 stw %r3,0(%r30) 112 bf+ 28,L(done_return_value) 113 stw %r4,4(%r30) 114 mtcrf 0x02,%r31 /* cr6 */ 115 bf 27,L(done_return_value) 116 stw %r5,8(%r30) 117 stw %r6,12(%r30) 118 /* Fall through... */ 119 120 L(done_return_value): 121 /* Restore the registers we used and return. */ 122 lwz %r9, 4(%r28) 123 lwz %r31, -4(%r28) 124 mtlr %r9 125 lwz %r30, -8(%r28) 126 lwz %r29,-12(%r28) 127 lwz %r28,-16(%r28) 128 lwz %r1,0(%r1) 129 blr 130 131 #ifndef __NO_FPRS__ 132 L(fp_return_value): 133 bf 28,L(float_return_value) 134 stfd %f1,0(%r30) 135 mtcrf 0x02,%r31 /* cr6 */ 136 bf 27,L(done_return_value) 137 stfd %f2,8(%r30) 138 b L(done_return_value) 139 L(float_return_value): 140 stfs %f1,0(%r30) 141 b L(done_return_value) 142 #endif 143 144 L(small_struct_return_value): 145 /* 146 * The C code always allocates a properly-aligned 8-byte bounce 147 * buffer to make this assembly code very simple. Just write out 148 * r3 and r4 to the buffer to allow the C code to handle the rest. 149 */ 150 stw %r3, 0(%r30) 151 stw %r4, 4(%r30) 152 b L(done_return_value) 153 154 .LFE1: 155 END(ffi_call_SYSV) 156 157 .section ".eh_frame",EH_FRAME_FLAGS,@progbits 158 .Lframe1: 159 .4byte .LECIE1-.LSCIE1 /* Length of Common Information Entry */ 160 .LSCIE1: 161 .4byte 0x0 /* CIE Identifier Tag */ 162 .byte 0x1 /* CIE Version */ 163 #if defined _RELOCATABLE || defined __PIC__ 164 .ascii "zR\0" /* CIE Augmentation */ 165 #else 166 .ascii "\0" /* CIE Augmentation */ 167 #endif 168 .uleb128 0x1 /* CIE Code Alignment Factor */ 169 .sleb128 -4 /* CIE Data Alignment Factor */ 170 .byte 0x41 /* CIE RA Column */ 171 #if defined _RELOCATABLE || defined __PIC__ 172 .uleb128 0x1 /* Augmentation size */ 173 .byte 0x1b /* FDE Encoding (pcrel sdata4) */ 174 #endif 175 .byte 0xc /* DW_CFA_def_cfa */ 176 .uleb128 0x1 177 .uleb128 0x0 178 .align 2 179 .LECIE1: 180 .LSFDE1: 181 .4byte .LEFDE1-.LASFDE1 /* FDE Length */ 182 .LASFDE1: 183 .4byte .LASFDE1-.Lframe1 /* FDE CIE offset */ 184 #if defined _RELOCATABLE || defined __PIC__ 185 .4byte .LFB1-. /* FDE initial location */ 186 #else 187 .4byte .LFB1 /* FDE initial location */ 188 #endif 189 .4byte .LFE1-.LFB1 /* FDE address range */ 190 #if defined _RELOCATABLE || defined __PIC__ 191 .uleb128 0x0 /* Augmentation size */ 192 #endif 193 .byte 0x4 /* DW_CFA_advance_loc4 */ 194 .4byte .LCFI0-.LFB1 195 .byte 0xd /* DW_CFA_def_cfa_register */ 196 .uleb128 0x08 197 .byte 0x4 /* DW_CFA_advance_loc4 */ 198 .4byte .LCFI5-.LCFI0 199 .byte 0x11 /* DW_CFA_offset_extended_sf */ 200 .uleb128 0x41 201 .sleb128 -1 202 .byte 0x9f /* DW_CFA_offset, column 0x1f */ 203 .uleb128 0x1 204 .byte 0x9e /* DW_CFA_offset, column 0x1e */ 205 .uleb128 0x2 206 .byte 0x9d /* DW_CFA_offset, column 0x1d */ 207 .uleb128 0x3 208 .byte 0x9c /* DW_CFA_offset, column 0x1c */ 209 .uleb128 0x4 210 .byte 0x4 /* DW_CFA_advance_loc4 */ 211 .4byte .LCFI6-.LCFI5 212 .byte 0xd /* DW_CFA_def_cfa_register */ 213 .uleb128 0x1c 214 .align 2 215 .LEFDE1: 216 217 #if defined __ELF__ && defined __linux__ 218 .section .note.GNU-stack,"",@progbits 219 #endif 220 #endif 221
