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 34FFI_HIDDEN(ffi_call_SYSV) 35ENTRY(ffi_call_SYSV) 36 .cfi_startproc 37 /* Save the old stack pointer as AP. */ 38 mr %r10,%r1 39 .cfi_def_cfa_register 10 40 41 /* Allocate the stack space we need. */ 42 stwux %r1,%r1,%r8 43 /* Save registers we use. */ 44 mflr %r9 45 stw %r28,-16(%r10) 46 stw %r29,-12(%r10) 47 stw %r30, -8(%r10) 48 stw %r31, -4(%r10) 49 stw %r9, 4(%r10) 50 .cfi_offset 65, 4 51 .cfi_offset 31, -4 52 .cfi_offset 30, -8 53 .cfi_offset 29, -12 54 .cfi_offset 28, -16 55 56 /* Save arguments over call... */ 57 stw %r7, -20(%r10) /* closure, */ 58 mr %r31,%r6 /* flags, */ 59 mr %r30,%r5 /* rvalue, */ 60 mr %r29,%r4 /* function address, */ 61 mr %r28,%r10 /* our AP. */ 62 .cfi_def_cfa_register 28 63 64 /* Call ffi_prep_args_SYSV. */ 65 mr %r4,%r1 66 bl ffi_prep_args_SYSV@local 67 68 /* Now do the call. */ 69 /* Set up cr1 with bits 4-7 of the flags. */ 70 mtcrf 0x40,%r31 71 /* Get the address to call into CTR. */ 72 mtctr %r29 73 /* Load all those argument registers. */ 74 lwz %r3,-24-(8*4)(%r28) 75 lwz %r4,-24-(7*4)(%r28) 76 lwz %r5,-24-(6*4)(%r28) 77 lwz %r6,-24-(5*4)(%r28) 78 bf- 5,1f 79 nop 80 lwz %r7,-24-(4*4)(%r28) 81 lwz %r8,-24-(3*4)(%r28) 82 lwz %r9,-24-(2*4)(%r28) 83 lwz %r10,-24-(1*4)(%r28) 84 nop 851: 86 87#ifndef __NO_FPRS__ 88 /* Load all the FP registers. */ 89 bf- 6,2f 90 lfd %f1,-24-(8*4)-(8*8)(%r28) 91 lfd %f2,-24-(8*4)-(7*8)(%r28) 92 lfd %f3,-24-(8*4)-(6*8)(%r28) 93 lfd %f4,-24-(8*4)-(5*8)(%r28) 94 nop 95 lfd %f5,-24-(8*4)-(4*8)(%r28) 96 lfd %f6,-24-(8*4)-(3*8)(%r28) 97 lfd %f7,-24-(8*4)-(2*8)(%r28) 98 lfd %f8,-24-(8*4)-(1*8)(%r28) 99#endif 1002: 101 102 /* Make the call. */ 103 lwz %r11, -20(%r28) 104 bctrl 105 106 /* Now, deal with the return value. */ 107 mtcrf 0x01,%r31 /* cr7 */ 108 bt- 31,L(small_struct_return_value) 109 bt- 30,L(done_return_value) 110#ifndef __NO_FPRS__ 111 bt- 29,L(fp_return_value) 112#endif 113 stw %r3,0(%r30) 114 bf+ 28,L(done_return_value) 115 stw %r4,4(%r30) 116 mtcrf 0x02,%r31 /* cr6 */ 117 bf 27,L(done_return_value) 118 stw %r5,8(%r30) 119 stw %r6,12(%r30) 120 /* Fall through... */ 121 122L(done_return_value): 123 /* Restore the registers we used and return. */ 124 lwz %r9, 4(%r28) 125 lwz %r31, -4(%r28) 126 mtlr %r9 127 lwz %r30, -8(%r28) 128 lwz %r29,-12(%r28) 129 lwz %r28,-16(%r28) 130 .cfi_remember_state 131 /* At this point we don't have a cfa register. Say all our 132 saved regs have been restored. */ 133 .cfi_same_value 65 134 .cfi_same_value 31 135 .cfi_same_value 30 136 .cfi_same_value 29 137 .cfi_same_value 28 138 /* Hopefully this works.. */ 139 .cfi_def_cfa_register 1 140 .cfi_offset 1, 0 141 lwz %r1,0(%r1) 142 .cfi_same_value 1 143 blr 144 145#ifndef __NO_FPRS__ 146L(fp_return_value): 147 .cfi_restore_state 148 bf 28,L(float_return_value) 149 stfd %f1,0(%r30) 150 mtcrf 0x02,%r31 /* cr6 */ 151 bf 27,L(done_return_value) 152 stfd %f2,8(%r30) 153 b L(done_return_value) 154L(float_return_value): 155 stfs %f1,0(%r30) 156 b L(done_return_value) 157#endif 158 159L(small_struct_return_value): 160 /* 161 * The C code always allocates a properly-aligned 8-byte bounce 162 * buffer to make this assembly code very simple. Just write out 163 * r3 and r4 to the buffer to allow the C code to handle the rest. 164 */ 165 stw %r3, 0(%r30) 166 stw %r4, 4(%r30) 167 b L(done_return_value) 168 .cfi_endproc 169 170END(ffi_call_SYSV) 171 172#if defined __ELF__ && defined __linux__ 173 .section .note.GNU-stack,"",@progbits 174#endif 175#endif 176