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 /* Load all the FP registers. */ 87 bf- 6,2f 88 lfd %f1,-16-(8*4)-(8*8)(%r28) 89 lfd %f2,-16-(8*4)-(7*8)(%r28) 90 lfd %f3,-16-(8*4)-(6*8)(%r28) 91 lfd %f4,-16-(8*4)-(5*8)(%r28) 92 nop 93 lfd %f5,-16-(8*4)-(4*8)(%r28) 94 lfd %f6,-16-(8*4)-(3*8)(%r28) 95 lfd %f7,-16-(8*4)-(2*8)(%r28) 96 lfd %f8,-16-(8*4)-(1*8)(%r28) 97 2: 98 99 /* Make the call. */ 100 bctrl 101 102 /* Now, deal with the return value. */ 103 mtcrf 0x01,%r31 /* cr7 */ 104 bt- 31,L(small_struct_return_value) 105 bt- 30,L(done_return_value) 106 bt- 29,L(fp_return_value) 107 stw %r3,0(%r30) 108 bf+ 28,L(done_return_value) 109 stw %r4,4(%r30) 110 mtcrf 0x02,%r31 /* cr6 */ 111 bf 27,L(done_return_value) 112 stw %r5,8(%r30) 113 stw %r6,12(%r30) 114 /* Fall through... */ 115 116 L(done_return_value): 117 /* Restore the registers we used and return. */ 118 lwz %r9, 4(%r28) 119 lwz %r31, -4(%r28) 120 mtlr %r9 121 lwz %r30, -8(%r28) 122 lwz %r29,-12(%r28) 123 lwz %r28,-16(%r28) 124 lwz %r1,0(%r1) 125 blr 126 127 L(fp_return_value): 128 bf 28,L(float_return_value) 129 stfd %f1,0(%r30) 130 mtcrf 0x02,%r31 /* cr6 */ 131 bf 27,L(done_return_value) 132 stfd %f2,8(%r30) 133 b L(done_return_value) 134 L(float_return_value): 135 stfs %f1,0(%r30) 136 b L(done_return_value) 137 138 L(small_struct_return_value): 139 mtcrf 0x10,%r31 /* cr3 */ 140 bt- 15,L(smst_one_register) 141 mtcrf 0x08,%r31 /* cr4 */ 142 bt- 16,L(smst_two_register) 143 b L(done_return_value) 144 145 L(smst_one_register): 146 rlwinm %r5,%r31,5+23,32-5,31 /* Extract the value to shift. */ 147 slw %r3,%r3,%r5 148 stw %r3,0(%r30) 149 b L(done_return_value) 150 L(smst_two_register): 151 rlwinm %r5,%r31,5+23,32-5,31 /* Extract the value to shift. */ 152 cmpwi %r5,0 153 subfic %r9,%r5,32 154 slw %r29,%r3,%r5 155 srw %r9,%r4,%r9 156 beq- L(smst_8byte) 157 or %r3,%r9,%r29 158 slw %r4,%r4,%r5 159 L(smst_8byte): 160 stw %r3,0(%r30) 161 stw %r4,4(%r30) 162 b L(done_return_value) 163 164 .LFE1: 165 END(ffi_call_SYSV) 166 167 .section ".eh_frame",EH_FRAME_FLAGS,@progbits 168 .Lframe1: 169 .4byte .LECIE1-.LSCIE1 /* Length of Common Information Entry */ 170 .LSCIE1: 171 .4byte 0x0 /* CIE Identifier Tag */ 172 .byte 0x1 /* CIE Version */ 173 #if defined _RELOCATABLE || defined __PIC__ 174 .ascii "zR\0" /* CIE Augmentation */ 175 #else 176 .ascii "\0" /* CIE Augmentation */ 177 #endif 178 .uleb128 0x1 /* CIE Code Alignment Factor */ 179 .sleb128 -4 /* CIE Data Alignment Factor */ 180 .byte 0x41 /* CIE RA Column */ 181 #if defined _RELOCATABLE || defined __PIC__ 182 .uleb128 0x1 /* Augmentation size */ 183 .byte 0x1b /* FDE Encoding (pcrel sdata4) */ 184 #endif 185 .byte 0xc /* DW_CFA_def_cfa */ 186 .uleb128 0x1 187 .uleb128 0x0 188 .align 2 189 .LECIE1: 190 .LSFDE1: 191 .4byte .LEFDE1-.LASFDE1 /* FDE Length */ 192 .LASFDE1: 193 .4byte .LASFDE1-.Lframe1 /* FDE CIE offset */ 194 #if defined _RELOCATABLE || defined __PIC__ 195 .4byte .LFB1-. /* FDE initial location */ 196 #else 197 .4byte .LFB1 /* FDE initial location */ 198 #endif 199 .4byte .LFE1-.LFB1 /* FDE address range */ 200 #if defined _RELOCATABLE || defined __PIC__ 201 .uleb128 0x0 /* Augmentation size */ 202 #endif 203 .byte 0x4 /* DW_CFA_advance_loc4 */ 204 .4byte .LCFI0-.LFB1 205 .byte 0xd /* DW_CFA_def_cfa_register */ 206 .uleb128 0x08 207 .byte 0x4 /* DW_CFA_advance_loc4 */ 208 .4byte .LCFI5-.LCFI0 209 .byte 0x11 /* DW_CFA_offset_extended_sf */ 210 .uleb128 0x41 211 .sleb128 -1 212 .byte 0x9f /* DW_CFA_offset, column 0x1f */ 213 .uleb128 0x1 214 .byte 0x9e /* DW_CFA_offset, column 0x1e */ 215 .uleb128 0x2 216 .byte 0x9d /* DW_CFA_offset, column 0x1d */ 217 .uleb128 0x3 218 .byte 0x9c /* DW_CFA_offset, column 0x1c */ 219 .uleb128 0x4 220 .byte 0x4 /* DW_CFA_advance_loc4 */ 221 .4byte .LCFI6-.LCFI5 222 .byte 0xd /* DW_CFA_def_cfa_register */ 223 .uleb128 0x1c 224 .align 2 225 .LEFDE1: 226 #endif 227 228 #if defined __ELF__ && defined __linux__ 229 .section .note.GNU-stack,"",@progbits 230 #endif 231
