1 /* ----------------------------------------------------------------------- 2 sysv.S - Copyright (c) 2014 Sebastian Macke <sebastian (at) macke.de> 3 4 OpenRISC Foreign Function Interface 5 6 Permission is hereby granted, free of charge, to any person obtaining 7 a copy of this software and associated documentation files (the 8 ``Software''), to deal in the Software without restriction, including 9 without limitation the rights to use, copy, modify, merge, publish, 10 distribute, sublicense, and/or sell copies of the Software, and to 11 permit persons to whom the Software is furnished to do so, subject to 12 the following conditions: 13 14 The above copyright notice and this permission notice shall be included 15 in all copies or substantial portions of the Software. 16 17 THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, 18 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 19 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 20 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT 21 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 22 WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 23 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 24 DEALINGS IN THE SOFTWARE. 25 ----------------------------------------------------------------------- */ 26 27 #define LIBFFI_ASM 28 #include <fficonfig.h> 29 #include <ffi.h> 30 31 .text 32 .globl ffi_call_SYSV 33 .type ffi_call_SYSV, @function 34 /* 35 r3: size to allocate on stack 36 r4: extended cif structure 37 r5: function pointer ffi_prep_args 38 r6: ret address 39 r7: function to call 40 r8: flag for return type 41 */ 42 43 ffi_call_SYSV: 44 /* Store registers used on stack */ 45 l.sw -4(r1), r9 /* return address */ 46 l.sw -8(r1), r1 /* stack address */ 47 l.sw -12(r1), r14 /* callee saved registers */ 48 l.sw -16(r1), r16 49 l.sw -20(r1), r18 50 l.sw -24(r1), r20 51 52 l.ori r14, r1, 0x0 /* save stack pointer */ 53 l.addi r1, r1, -24 54 55 l.ori r16, r7, 0x0 /* save function address */ 56 l.ori r18, r6, 0x0 /* save ret address */ 57 l.ori r20, r8, 0x0 /* save flag */ 58 59 l.sub r1, r1, r3 /* reserve space on stack */ 60 61 /* Call ffi_prep_args */ 62 l.ori r3, r1, 0x0 /* first argument stack address, second already ecif */ 63 l.jalr r5 64 l.nop 65 66 /* Load register arguments and call*/ 67 68 l.lwz r3, 0(r1) 69 l.lwz r4, 4(r1) 70 l.lwz r5, 8(r1) 71 l.lwz r6, 12(r1) 72 l.lwz r7, 16(r1) 73 l.lwz r8, 20(r1) 74 l.ori r1, r11, 0x0 /* new stack pointer */ 75 l.jalr r16 76 l.nop 77 78 /* handle return values */ 79 80 l.sfeqi r20, FFI_TYPE_STRUCT 81 l.bf ret /* structs don't return an rvalue */ 82 l.nop 83 84 /* copy ret address */ 85 86 l.sfeqi r20, FFI_TYPE_UINT64 87 l.bnf four_byte_ret /* 8 byte value is returned */ 88 l.nop 89 90 l.sw 4(r18), r12 91 92 four_byte_ret: 93 l.sw 0(r18), r11 94 95 ret: 96 /* return */ 97 l.ori r1, r14, 0x0 /* reset stack pointer */ 98 l.lwz r9, -4(r1) 99 l.lwz r1, -8(r1) 100 l.lwz r14, -12(r1) 101 l.lwz r16, -16(r1) 102 l.lwz r18, -20(r1) 103 l.lwz r20, -24(r1) 104 l.jr r9 105 l.nop 106 107 .size ffi_call_SYSV, .-ffi_call_SYSV 108
